Patent Publication Number: US-2022216023-A1

Title: Direct current contactor and vehicle

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2020/097551, filed on Jun. 22, 2020, which claims priority to Chinese Patent Application No. 201910936103.1, filed on Sep. 29, 2019. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     This application relates to the field of power technologies, and in particular, to a direct current contactor and a vehicle. 
     BACKGROUND 
     A high-voltage direct current contactor is an important power distribution control component of a direct current charging loop of a new energy vehicle. With improvement of an endurance capability requirement for a new energy vehicle, a capacity of a vehicle battery is also becoming larger. Therefore, voltage and current level requirements for an in-vehicle direct current contactor are becoming higher in the market (a current in-vehicle contactor has a maximum rated voltage of 800 Vd.c. to 1000 Vd.c. and a rated current of 200 A to 400 A). A volume and costs of a direct current contactor are determined by rated voltage and rated current levels of the contactor, and increases in a voltage and a current inevitably result in an increase in a volume and an increase in costs. 
     In a current direct current fast charging loop, regardless of a power side of a direct current fast charging apparatus or an in-vehicle power distribution unit (PDU), due to safety regulations (after a vehicle completes charging, an isolating distance is needed between a charging port/charging gun and a live power supply), one high-voltage direct current contactor is installed in each of positive electrode and negative electrode lines. This greatly increases total costs and a total volume of a charging loop apparatus. Because the two contactors of positive and negative electrodes of the direct current fast charging loop are simultaneously controlled to be open and closed, integrated design of the two contactors is an effective way to reduce total contactor costs and simplify a charging loop structure. 
     SUMMARY 
     This application provides a direct current contactor and a vehicle, to reduce a total contactor resistance and an on-state current loss of the direct current contactor, thereby simplifying a structure of the direct current contactor and reducing manufacturing costs of the direct current contactor. 
     According to a first aspect, a direct current contactor is provided. The direct current contactor is used in electrical connection. The direct current contactor includes a housing. The housing is used as a carrier. A first fixed contact and a second fixed contact are fastened into the housing, and the first fixed contact and the second fixed contact separately partially extend from the housing. Parts that are of the first fixed contact and the second fixed contact and that extend from the housing are used as connecting ends. In addition, the direct current contactor further includes a first moving contact and a second moving contact that are located in the housing, and the first moving contact and the second moving contact are respectively in a one-to-one correspondence with the first fixed contact and the second fixed contact. In addition, a first connecting bar and a second connecting bar are further disposed outside the housing, and the first connecting bar and the second connecting bar are respectively used as external connecting ends of the first moving contact and the second moving contact. During connection, the first connecting bar is electrically connected to the first moving contact by using a flexible cable, and the second connecting bar is electrically connected to the second moving contact by using a flexible cable. A path is formed when the first fixed contact is connected to the first moving contact, another path is formed when the second fixed contact is connected to the second moving contact, and the two paths may be used as a positive electrode connecting path and a negative electrode connecting path. During use, in the direct current contactor, disconnection and connection of the two paths are controlled by controlling movement of the first moving contact and the second moving contact. In an embodiment, the control is implemented by using a drive mechanism. The drive mechanism includes an insulation rod connected to the first moving contact and the second moving contact, so that the first moving contact and the second moving contact can synchronously move by using the insulation rod. In addition, the drive mechanism further includes a drive component that drives the insulation rod to drive the first moving contact and the second moving contact to synchronously move toward the first fixed contact and the second fixed contact, and a pressing component configured to push the first moving contact and the second moving contact to firmly against the first fixed contact and the second fixed contact in a one-to-one correspondence. It can be learned from the foregoing description that, in this application, only two pairs of contacts are used to implement connection/disconnection of two electrode lines, so that a total contactor resistance is reduced by half compared with that in the conventional technology, thereby resolving a problem of a large on-state current loss in the conventional technology. In addition, drive power consumption of a coil is reduced by half; and only a single drive mechanism is needed to drive two contacts, thereby greatly reducing difficulty in implementing closing and opening synchronicity between two electrode contacts. 
     In an embodiment, the first moving contact and the second moving contact can separately slide relative to the housing, and the drive component is configured to push the insulation rod to drive the first fixed contact and the second fixed contact to slide. Connection between the first moving contact and the first fixed contact and connection between the second moving contact and the second fixed contact are implemented through sliding of the first moving contact and the second moving contact. 
     In an embodiment, the insulation rod includes a support rod and a first connecting rod and a second connecting rod that are disposed on the support rod through fastening, and the first moving contact and the second moving contact are slidably assembled onto the first connecting rod and the second connecting rod in a one-to-one correspondence; and the pressing component includes: a first elastic member sleeved onto the first connecting rod, where two ends of the first elastic member are respectively pressed against the support rod and the first moving contact; and a second elastic member sleeved onto the second connecting rod, where two ends of the second elastic member are respectively pressed against the support rod and the second moving contact. A difference between the first moving contact and the second moving contact is reduced by using the first elastic member and the second elastic member, to ensure reliability of connection to the first fixed contact and the second fixed contact. 
     In an embodiment, a through hole that fits with the first connecting rod is disposed in the first moving contact, the first connecting rod is exposed after penetrating through the through hole, a locking nut is disposed on an exposed end part of the first connecting rod, and a groove for accommodating the locking nut is disposed on the first fixed contact; and a through hole that fits with the second connecting rod is disposed on the second fixed contact, the second connecting rod is exposed after penetrating through the through hole, a locking nut is disposed on an exposed end part of the second connecting rod, and a groove for accommodating the locking nut is disposed on the second moving contact, to prevent the locking nuts from being exposed, thereby ensuring reliability of connection between the first moving contact and the first fixed contact and reliability of connection between the second moving contact and the second fixed contact. 
     In an embodiment, the drive component includes a drive rod slidably connected to the housing, where the drive rod is connected to the support rod through fastening; and further includes a drive member configured to drive the drive rod to slide. 
     In an embodiment, the insulation rod includes a support rod, and the first moving contact and the second moving contact are separately connected to the support rod through fastening; the support rod is slidably connected to the drive component; and the pressing component includes a second elastic member, where one end of the second elastic member is abutted against the support rod, and the other end of the second elastic member is abutted against the drive component. The support rod is pushed, by using the second elastic member, to slide, to ensure reliability of connection between the moving contact and the fixed contact. 
     In an embodiment, the drive component includes a drive rod slidably connected to the housing, the drive rod is slidably connected to the support rod, the second elastic member is sleeved onto the drive rod, one end of the second elastic member is in pressure contact with the support rod, and the other end of the second elastic member is in pressure contact with the drive rod. The support rod is pushed, by using the second elastic member, to slide, to ensure reliability of connection between the moving contact and the fixed contact. 
     In an embodiment, the drive member includes: a first iron core and a second iron core that are oppositely disposed, where the first iron core is fastened onto the drive rod, the second iron core is fastened into the housing, and there is a gap between the first iron core and the second iron core; and 
     a magnetic coil that surrounds the first iron core and the second iron core, where when the magnetic coil is powered on, the second iron core and the first iron core attract each other; and 
     further includes a reset spring that is sleeved onto the drive rod and whose two ends are respectively pressed against the first iron core and the second iron core. 
     In an embodiment, the direct current contactor further includes a first magnet and a second magnet that are disposed on two opposite sides of an outer sidewall of the housing, where the first magnet is configured to extinguish an electric arc between the first fixed contact and the first moving contact, and the second magnet is configured to extinguish an electric arc between the second fixed contact and the second moving contact. There is no risk of short circuit caused because break arcs cross or are in contact with other electrodes. The contact structure can simplify an embodiment of a double-connection arc-extinguishing chamber, so that non-polar arc-extinguishing can be implemented without making a ceramic isolation wall between the two electrode contacts, and a quantity of arc-extinguishing permanent magnets can be reduced from 4 to 2. 
     In an embodiment, a first magnetic pole of the first magnet faces a gap between the first fixed contact and the first moving contact, a second magnetic pole of the second magnet faces a gap between the second fixed contact and the second moving contact, and polarity of the first magnetic pole is opposite to polarity of the second magnetic pole. 
     In an embodiment, the first moving contact includes a first body and a first elastic sheet connected to the first body, and the second moving contact includes a second body and a second elastic sheet connected to the second body; 
     the insulation rod is separately connected to the first elastic sheet and the second elastic sheet through fastening; and 
     the drive component is configured to drive the insulation rod to drive the first elastic sheet and the second elastic sheet to synchronously rotate toward the first fixed contact and the second fixed contact. Electrical connection between the fixed contacts and the moving contacts is implemented through rotating of the first elastic sheet and the second elastic sheet. 
     In an embodiment, the drive component includes a drive rod connected to the insulation rod through fastening, an armature connected to the drive rod, and an electromagnet that drives the armature to rotate. 
     In an embodiment, the armature is a V-shaped armature, the armature includes a first part and a second part connected to the first part, an angle between the first part and the second part is greater than 90 degrees, and the drive rod is connected to the first part through fastening; 
     the electromagnet includes an iron core and a coil wound around the iron core, and further includes a yoke fastened to the coil, where the yoke faces the insulation rod; 
     a connection position between the first part and the second part laps on an edge of the yoke, the first part is stacked with the yoke, and the second part faces the iron core; and 
     a reset spring is further included, where the reset spring is configured to push the first part against the yoke. Rotation of the first elastic sheet and the second elastic sheet is driven through rotation of the armature. 
     In an embodiment, the direct current contactor further includes a third magnet disposed outside the housing and a U-shaped magnetic conductive member connected to the third magnet, and two opposite sidewalls of the U-shaped magnetic conductive member are respectively configured to extinguish an electric arc between the first fixed contact and the first elastic sheet and an electric arc between the second fixed contact and the second elastic sheet. This improves an arc-extinguishing effect. 
     According to a second aspect, a vehicle is provided. The vehicle includes a body, a power distribution unit disposed on the body, and the direct current contactor according to any one of the first aspect and embodiments of the first aspect that is connected to the power distribution unit. In this application, only two pairs of contacts are used to implement connection/disconnection of two electrode lines, so that a total contactor resistance is reduced by half compared with that in the conventional technology, thereby resolving a problem of a large on-state current loss in the conventional technology. In addition, drive power consumption of the coil is reduced by half; and only a single drive mechanism is needed to drive two contacts, thereby greatly reducing difficulty in implementing closing and opening synchronicity between two electrode contacts. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a reference diagram of a use status of a direct current contactor in the conventional technology; 
         FIG. 2  is a schematic diagram of a first direct current contactor according to an embodiment of this application; 
         FIG. 3  is a schematic diagram of an internal structure of a first direct current contactor according to an embodiment of this application; 
         FIG. 4  is a schematic diagram of an internal structure of a second direct current contactor according to an embodiment of this application; 
         FIG. 5  is a schematic diagram of a direct current contactor during arc-extinguishing according to an embodiment of this application; 
         FIG. 6  is a schematic diagram of a structure of a third direct current contactor according to an embodiment of this application; 
         FIG. 7  is a cross-sectional view at A-A in  FIG. 6 ; and 
         FIG. 8  is a cross-sectional view at B-B in  FIG. 6 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     To facilitate understanding of a direct current contactor provided in the embodiments of this application, first, an application scenario of the direct current contactor is described. The direct current contactor is applied to electrical connection, such as connection between an electric vehicle and a direct current fast charging apparatus, or connection between another electric cabinet and other electric equipment. The following uses an electric vehicle and a direct current fast charging apparatus as an example to describe application of the direct current contactor.  FIG. 1  is a schematic diagram of fitting between an existing electric vehicle and a direct current fast charging apparatus. A PDU and a high-voltage battery pack connected to the PDU are disposed in the electric vehicle. A port of the electric vehicle has two wiring terminals: a PIN  1  and a PIN  2 . The PIN  1  is a positive electrode terminal, and the PIN  2  is a negative electrode terminal. The PIN  1  terminal is connected to the PDU by using a direct current contactor, and then the PDU is connected to a positive electrode of the high-voltage battery pack. The PIN  2  terminal is connected to a negative electrode of the high-voltage battery pack by using a direct current contactor. During use, connection between the direct current fast charging apparatus and the high-voltage battery pack is controlled by controlling closing and opening of the direct current contactors. However, in the conventional technology, during direct current contactor disposition, a PIN  1  terminal and a PIN  2  terminal each need to be connected to one direct current contactor. As a result, an entire charging apparatus has a relatively large volume and occupies relatively large space. In addition, because two direct current contactors are used, it is difficult to completely synchronously open and close the two direct current contactors. Therefore, an embodiment of this application provides a direct current contactor. The following describes the direct current contactor in detail with reference to accompanying drawings and embodiments. 
       FIG. 2  is a schematic diagram of a structure of the direct current contactor, and  FIG. 3  is a schematic diagram of an internal structure of the direct current contactor. First, referring to  FIG. 2 , the direct current contactor shown in  FIG. 2  includes a housing and four connecting bars disposed on the housing. For ease of description, the four connecting bars are separately named a first connecting bar A 2 , a second connecting bar B 2 , a third connecting bar A 1 , and a fourth connecting bar B 1 . When the direct current contactor shown in  FIG. 2  is applied to  FIG. 1 , the third connecting bar A 1  is configured to be connected to the PIN  1  terminal in  FIG. 1 , the fourth connecting bar B 1  is configured to be connected to the PIN  2  terminal in  FIG. 1 , the first connecting bar A 2  is configured to be connected to the positive electrode of the high-voltage battery pack, and the second connecting bar B 2  is configured to be connected to the negative electrode of the high-voltage battery pack. The first connecting bar A 2  and the third connecting bar A 1  are on a positive electrode line, and the second connecting bar B 2  and the fourth connecting bar B 1  are on a negative electrode line. Certainly, the foregoing is only an example. Alternatively, the first connecting bar A 2  and the third connecting bar A 1  may be on a negative electrode line, and the second connecting bar B 2  and the fourth connecting bar B 1  may be on a positive electrode line. In an embodiment of the application, the first connecting bar A 2  and the third connecting bar A 1  are merely limited to one line and are not specifically limited to a positive electrode line or a negative electrode line, and the second connecting bar B 2  and the fourth connecting bar B 1  are merely limited to one line and are not specifically limited to a positive electrode line or a negative electrode line. 
     Still referring to  FIG. 2 , when the first connecting bar A 2 , the second connecting bar B 2 , the third connecting bar A 1 , and the fourth connecting bar B 1  are disposed, the first connecting bar A 2  and the third connecting bar A 1  are oppositely disposed on two opposite sides of the housing, and the second connecting bar B 2  and the fourth connecting bar B 1  are oppositely disposed on the two opposite sides of the housing. In addition, when the four connecting bars are disposed, the first connecting bar A 2 , the second connecting bar B 2 , the third connecting bar A 1 , and the fourth connecting bar B 1  are separately insulated from the housing. Certainly, it should be understood that the arrangement manner shown in  FIG. 2  is only an example in an embodiment of the application. In an embodiment of the application, positions of the first connecting bar A 2 , the second connecting bar B 2 , the third connecting bar A 1 , and the fourth connecting bar B 1  relative to the housing are not limited. When the four connecting bars are disposed, the first connecting bar A 2  and the second connecting bar B 2  are located on a same side of the housing, and the third connecting bar A 1  and the fourth connecting bar B 1  are located on a same side of the housing, to facilitate connection between the connecting bars of the direct current contactor and cables. 
       FIG. 3  is a schematic diagram of an internal structure of the direct current contactor according to an embodiment of this application. It can be learned from  FIG. 3  that the housing provided in an embodiment of the application is divided into two parts: a first housing and a second housing connected to the first housing through fastening. The first housing and the second housing share one sidewall. The first housing may be a ceramic housing, and the first housing has an arc-extinguishing chamber  10  inside and is sealed and filled with gas. The filled gas may be H 2 , N 2 , or H 2 /N 2  mixed gas, and an arc-extinguishing capability can be improved by increasing air pressure. The second housing has a drive chamber  90  inside. Certainly, the housing provided in an embodiment of the application may be alternatively of an integral structure. In this case, the housing may be divided into the arc-extinguishing chamber  10  and the drive chamber  90  inside by using an isolating board or another structure. The following still uses an example in which the housing includes the first housing and the second housing, for description. 
     Referring to  FIG. 2  and  FIG. 3  together, when connected to the housing, the first connecting bar A 2 , the second connecting bar B 2 , the third connecting bar A 1 , and the fourth connecting bar B 1  are connected to the first housing. In addition, four contacts are disposed in the first housing: a first fixed contact  21 , a second fixed contact  22 , a first moving contact  61 , and a second moving contact  62 . The first moving contact  61  is correspondingly connected to the first fixed contact  21 , and the second moving contact  62  is correspondingly connected to the second fixed contact  22 . The two moving contacts can move relative to the two fixed contacts, and opening and closing of the direct current contactor are controlled through connection and disconnection between the first fixed contact  21  and the first moving contact  61  and connection and disconnection between the second fixed contact  22  and the second moving contact  62 . 
     Still referring to  FIG. 2  and  FIG. 3 , the four contacts are connected to the four connecting bars in a one-to-one correspondence. In an embodiment, when the first fixed contact  21  and the second fixed contact  22  are separately connected to the first housing through fastening, the first fixed contact  21  and the second fixed contact  22  partially extend from the first housing. A part that is of the first fixed contact  21  and that extends from the first housing is the third connecting bar A 1 , and a part that is of the second fixed contact  22  and that extends from the first housing is the fourth connecting bar B 1 . When the first connecting bar A 2  and the second connecting bar B 2  are respectively connected to the first moving contact  61  and the second moving contact  62 , because the first moving contact  61  and the second moving contact  62  can move relative to the first fixed contact  21  and the second fixed contact  22 , and also move relative to the first connecting bar A 2  and the second connecting bar B 2 , a structure shown in  FIG. 2  and  FIG. 3  is used during connection: The first connecting bar A 2  is connected to the first moving contact  61  by using a flexible cable  30 , and the second connecting bar B 2  is connected to the second moving contact  62  by using a flexible cable  30 . In this case, when the first moving contact  61  and the second moving contact  62  move relative to the first connecting bar A 2  and the second connecting bar B 2 , both stability of connection between the first moving contact  61  and the first connecting bar A 2  and stability of connection between the second moving contact  62  and the second connecting bar B 2  can be ensured through deformation of the flexible cables  30 . 
     It can be learned from the foregoing description that when the direct current connector is open, power outage between components connected to the direct current connector can be ensured, provided that the first moving contact  61  is separated from the first fixed contact  21  and the second moving contact  62  is separated from the second fixed contact  22 . In addition, only two types of contact (contact between the first moving contact  61  and the first fixed contact  21  and contact between the second moving contact  62  and the second fixed contact  22 ) are used, so that a total contactor resistance of the direct current contactor is reduced by half compared with that in the conventional technology, thereby resolving a problem of a large on-state current loss. 
     Still referring to  FIG. 3 , when the first moving contact  61  and the second moving contact  62  move relative to the first fixed contact  21  and the second fixed contact  22 , the first moving contact  21  and the second moving contact  22  can separately slide relative to the housing. As shown by arrows shown in  FIG. 3 , the first moving contact  61  and the second moving contact  62  can reciprocate in directions shown by the arrows shown in  FIG. 3 . A placement direction of the direct current contactor shown in  FIG. 3  is used as a reference direction. When the first moving contact  61  and the second moving contact  62  move in a direction shown by a vertically upward arrow, the first moving contact  61  and the second moving contact  62  are respectively in pressure contact with the first fixed contact  21  and the second fixed contact  22 . In this case, the direct current contactor is conducted. When the first moving contact  61  and the second moving contact  62  move in a direction shown by a vertically downward arrow, the first moving contact  61  and the second moving contact  62  are respectively detached from the first fixed contact  21  and the second fixed contact  22 . In this case, the direct current contactor is open. 
     Still referring to  FIG. 3 , when the first moving contact  61  and the second moving contact  62  are driven, the driving is implemented by using a drive mechanism. The drive mechanism includes an insulation rod  50 , a drive component  80 , and a pressing component  70 . The insulation rod  50  is separately connected to the first moving contact  61  and the second moving contact  62 , and the first moving contact  61  and the second moving contact  62  are insulated from the insulation rod  50 . For example, the insulation rod  50  is insulated from the first moving contact  61  and the second moving contact  62  by being made of an insulation material (such as plastic or resin), or in a manner in which an insulation pad is sleeved onto the insulation rod  50 . Still referring to  FIG. 3 , the insulation rod  50  includes one support rod  52  and two connecting rods  51 . The two connecting rods  51  and the support rod  52  may be of an integral structure. In this case, the support rod  52  and the two connecting rods  51  may be directly prepared in an integral injection molding manner, or may be prepared in a cutting manner. In addition, the two connecting rods  51  and the support rod  52  may be alternatively of a split structure. In this case, the two connecting rods  51  each may be connected to the support rod  52  through fastening by using a connecting member such as a bolt or a screw, or may be connected to the support rod  52  through fastening in a welding or bonding manner. 
     Still referring to  FIG. 3 , the two connecting rods  51  are respectively configured to fasten the first moving contact  61  and the second moving contact  62  in a one-to-one correspondence. For ease of description, the two connecting rods  51  are separately named a first connecting rod  51  and a second connecting rod  51 . A manner in which the first connecting rod  51  is connected to the first moving contact  61  is the same as a manner in which the second connecting rod  51  is connected to the second moving contact  62 . Therefore, the following describes a manner in which the first moving contact  61  fits with the first connecting rod  51 . 
     Still referring to  FIG. 3 , the first moving contact  61  is slidably assembled onto the first connecting rod  51 , and can slide in a vertical direction relative to the first connecting rod  51 . A through hole that allows to be penetrated through is disposed in the first moving contact  61 . During assembling, the first connecting rod  51  is inserted into a first through hole and exposed, and a locking nut is disposed on an exposed end part of the first connecting rod  51 . The locking nut is connected to the first connecting rod  51  by using screw threads, and the locking nut is abutted against an end face that is of the first moving contact  61  and that faces away from the support rod  52 , or the first moving contact may be locked in another limiting manner, for example, by using a buckle. The locking nut is used as a limiting member, to limit a sliding distance of the first moving contact  61  on the first connecting rod  51 . Still referring to  FIG. 3 , it can be learned from  FIG. 3  that, the face that is of the first moving contact  61  and that faces away from the support rod  52  is an end face that is of the first moving contact  61  and that fits with the first fixed contact  21 . To prevent the disposed locking nut from affecting an effect of contact between the first moving contact  61  and the first fixed contact  21 , a groove for accommodating the locking nut is disposed on the first fixed contact  61 . In an assembling effect shown in  FIG. 3 , both the end part of the first connecting rod  51  and the locking nut are located in the groove, and both end surfaces of the first connecting rod  51  and the locking nut are located in the groove, to prevent the first connecting rod  51  and the locking nut from protruding from the first fixed contact  61 . 
     Still referring to  FIG. 3 , a first elastic member is further sleeved onto the first connecting rod  51 , and two ends of the first elastic member are respectively pressed against the first moving contact  61  and the support rod  52 . When being elastically deformed, the first elastic member pushes the first moving contact  61  firmly against the first fixed contact  21 . When the first moving contact  61  moves along the vertically upward arrow shown in  FIG. 3 , when the first moving contact  61  is in contact with the first fixed contact  21 , the first moving contact  61  slides relative to the support rod  52 ; and simultaneously the first elastic member is compressed to be elastically deformed, and the deformed first elastic member pushes the first moving contact  61  firmly against the first fixed contact  21 . The first elastic member may be an elastic member that can push the first moving contact  61  firmly against the first fixed contact  21  when being deformed, such as a compression spring or a rubber spring. 
     The second connecting rod  51  is connected to the second moving contact  62  in a manner similar to the foregoing manner. As shown in  FIG. 3 , the second connecting rod  51  is exposed after penetrating through a through hole in the second moving contact  62 , a locking nut is disposed on an exposed end part of the second connecting rod  51 , and a groove for accommodating the locking nut is disposed on the second fixed contact  62 . A second elastic member is sleeved onto the second connecting rod  51 , and two ends of the second elastic member are respectively pressed against the second moving contact  62  and the support rod  52 . For a structure of the second connecting rod  51  and the second moving contact  62 , refer to the descriptions of the first connecting rod  51  and the first moving contact  61 . Details are not described herein. 
     Still referring to  FIG. 3 , in the drive mechanism provided in an embodiment of the application, the disposed insulation rod  50  is separately connected to the first moving contact  61  and the second moving contact  62 , so that when the drive mechanism drives the first moving contact  61  and the second moving contact  62  to move, synchronous movement of the first moving contact  61  and the second moving contact  62  can be ensured by using the insulation rod  50 . In addition, as the foregoing pressing component  70 , the first elastic member and the second elastic member can respectively push the first moving contact  61  firmly against the first fixed contact  21  and push the second moving contact  62  firmly against the second fixed contact  22 , so that a difference between the first moving contact  61  and the second moving contact  62  during synchronous movement can be avoided. If an assembling error exists between the first fixed contact  21  and the second fixed contact  22 , or an assembling error exists between the first moving contact  61  and the second moving contact  62 , the error between the two contacts can be eliminated by using the disposed first elastic member and second elastic member to push the first moving contact  61  and the second moving contact  62  to slide, to ensure that the first moving contact  61  and the second moving contact  62  can be respectively reliably connected to the first fixed contact  21  and the second fixed contact  22 . 
     Still referring to  FIG. 3 , the drive mechanism provided in an embodiment of the application further includes the drive component  80 . The drive component  80  is configured to drive the insulation rod  50  to drive the first moving contact  61  and the second moving contact  62  to synchronously move toward the first fixed contact  21  and the second fixed contact  22 . As shown in  FIG. 3 , the drive component  80  includes a drive rod  82  slidably connected to the housing, and the drive rod  82  is connected to the support rod  52  through fastening. As shown in  FIG. 3 , the drive rod  82  is disposed in the second housing and extends into the first housing by penetrating through the sidewall between the second housing and the first housing, and an end that is of the drive rod  82  and that extends into the first housing is connected to the support rod  52  through fastening. As shown in  FIG. 3 , the support rod  52  and the drive rod  82  form a T-shaped structure. When the support rod  52  is connected to the drive rod  82 , the drive rod  82  and the support rod  52  may be of an integral structure, or the drive rod  82  and the support rod  52  may be of a split structure. When the drive rod  82  and the support rod  52  are of a split structure, the drive rod  82  and the support rod  52  are connected in a bonding manner, a welding manner, or the like, or may be connected through fastening by using a screw thread connecting member. 
     Still referring to  FIG. 3 , the drive component  80  further includes a drive member. The drive member is configured to drive the drive rod  82  to slide. As shown in  FIG. 3 , the drive member includes two oppositely disposed iron cores. For ease of description, the two iron cores are separately named a first iron core  81  and a second iron core  84 . The first iron core  81  is fastened onto the drive rod  82 , the second iron core  84  is fastened into the housing, and there is a gap between the first iron core  81  and the second iron core  84 . As shown in  FIG. 3 , the first iron core  81  is fastened to an end that is of the drive rod  82  and that is far away from the first housing, and the second iron core  84  is fastened to an end that is in the second housing and that is close to the first housing. In addition, a through hole that allows to be penetrated through by the drive rod  82  is disposed in the second iron core  84 , and during assembling, the drive rod  82  is inserted into the first housing after penetrating through the through hole of the second iron core  84 . As shown in  FIG. 4 , there is the gap between the first iron core  81  and the second iron core  84 , and a reset spring  83  is disposed at the gap. The reset spring  83  is sleeved onto the drive rod  82 , and two ends of the reset spring  83  are respectively pressed against the first iron core  81  and the second iron core  84 . Still referring to  FIG. 4 , the drive member further includes a magnetic coil that surrounds the first iron core  81  and the second iron core  84 . In addition, when the magnetic coil is powered on, the second iron core  84  and the first iron core  81  attract each other. During use of the direct current contactor, when the magnetic coil is powered on, the second iron core  84  and the first iron core  81  attract each other. Because the second iron core  84  is fastened into the second housing, the first iron core  81  overcomes an elastic force of the reset spring  83  to slide toward the magnetic coil and simultaneously push the drive rod  82  to slide, and the drive rod  82  drives the insulation rod  50  to push the first moving contact  61  and the second moving contact  62  to move in the direction shown by the vertically upward arrow in  FIG. 4 . When the first iron core  81  is in contact with the second iron core  84 , the first moving contact  61  and the second moving contact  62  are respectively pressed against the first fixed contact  21  and the second fixed contact  22 . When the magnetic coil is powered off, there is no electromagnetic force between the second iron core  84  and the first iron core  81 . Under the action of an elastic force of the reset spring  83 , the first iron core  81  is pushed to downward move along the vertically downward arrow shown in  FIG. 4 , and finally returns to an initial position. Simultaneously, the drive rod  82  drives the insulation rod  50  to pull the first moving contact  61  and the second moving contact  62  to be respectively separated from the first fixed contact  21  and the second fixed contact  22 . 
     Still referring to  FIG. 3 , when the reset spring  83  is disposed, a groove for accommodating the reset spring  83  is disposed on the iron core. One end of the reset spring  83  is abutted against the bottom of the groove, and the reset spring  83  partially extends from the groove. When the reset spring  83  is compressed, a sidewall of the groove plays a limiting role, to ensure that the reset spring  83  can be compressed in a vertical direction. In addition, the groove also accommodates the compressed reset spring  83 , to ensure that the first iron core  81  can be in contact with the core. 
       FIG. 3  shows only a manner of driving the first moving contact  61  and the second moving contact  62 . The drive mechanism and the pressing component  70  of the direct current contactor provided in an embodiment of the application are not limited to the manner shown in  FIG. 3 .  FIG. 4  shows an assembling manner of another pressing component  70 . In a structure shown in  FIG. 4 , a drive mechanism includes an insulation rod  50  and a drive component  80 . The insulation rod  50  includes only a support rod  52 , and the support rod  52  is separately connected to the first moving contact  61  and the second moving contact  62  through fastening. The support rod  52  is slidably connected to the drive component  80 , and the drive component  80  is configured to drive the insulation rod  50  to drive the first moving contact  61  and the second moving contact  62  to synchronously move toward the first fixed contact  21  and the second fixed contact  22 . 
     As shown in  FIG. 4 , the drive component  80  includes a drive rod  82  slidably connected to the first housing, the drive rod  82  is slidably connected to the support rod  52 , and the support rod  52  and the drive rod  82  form a T-shaped structure. As shown in  FIG. 4 , the drive rod  82  is disposed in the second housing, extends into the first housing by penetrating through the sidewall between the second housing and the first housing, and an end that is of the drive rod  82  and that extends into the first housing is slidably connected to the support rod  52 . Still referring to  FIG. 4 , a second elastic member is sleeved onto the drive rod  82 . One end of the second elastic member is abutted against the support rod  52 , and the other end of the second elastic member is abutted against the drive rod  82 . The second elastic member is the foregoing pressing component  70 . As shown in  FIG. 4 , a shoulder is disposed on the drive rod  82 , and one end of the second elastic member is abutted against the shoulder. When the drive rod  82  drives the first moving contact  61  and the second moving contact  62 , the drive rod  82  pushes the support rod  52  to upward move in a direction shown by a vertically upward arrow shown in  FIG. 4 , to drive the first moving contact  61  and the second moving contact  62  to move toward the first fixed contact  21  and the second fixed contact  22 . When the support rod  52  is driven, the drive rod  82  first slides relative to the support rod  52 , the second elastic member is compressed, and the support rod  52  is driven, by using an elastic force of the second elastic member, to upward move. After the first moving contact  61  is in contact with the first fixed contact  21  and the second moving contact  62  is in contact with the second fixed contact  22 , the drive rod  82  continues to upward move, and in this case, the second elastic member continues to be compressed and generates a force for pushing the first moving contact  61  against the first fixed contact  21  and pushing the second moving contact  62  against the second fixed contact  22 , to ensure reliable contact between the first moving contact  61  and the first fixed contact  21  and reliable contact between the second moving contact  62  and the second fixed contact  22 . 
     Still referring to  FIG. 4 , the drive component  80  further includes a drive member. The drive member is configured to drive the drive rod  82  to slide. As shown in  FIG. 4 , the drive member includes two oppositely disposed iron cores. For ease of description, the two iron cores are separately named a first iron core  81  and a second iron core  84 . The first iron core  81  is fastened onto the drive rod  82 , the second iron core  84  is fastened into the housing, and there is a gap between the first iron core  81  and the second iron core  84 . As shown in  FIG. 4 , the first iron core  81  is fastened to an end that is of the drive rod  82  and that is far away from the first housing, and the second iron core  84  is fastened to an end that is in the second housing and that is close to the first housing. In addition, a through hole that allows to be penetrated through by the drive rod  82  is disposed in the second iron core  84 , and during assembling, the drive rod  82  is inserted into the first housing after penetrating through the through hole of the second iron core  84 . As shown in  FIG. 4 , there is the gap between the first iron core  81  and the second iron core  84 , and a reset spring  83  is disposed at the gap. The reset spring  83  is sleeved onto the drive rod  82 , and two ends of the reset spring  83  are respectively pressed against the first iron core  81  and the second iron core  84 . Still referring to  FIG. 4 , the drive member further includes a magnetic coil that surrounds the first iron core  81  and the second iron core  84 . In addition, when the magnetic coil is powered on, the second iron core  84  and the first iron core  81  attract each other. During use of the direct current contactor, when the magnetic coil is powered on, the second iron core  84  and the first iron core  81  attract each other. Because the second iron core  84  is fastened into the second housing, the first iron core  81  overcomes an elastic force of the reset spring  83  to slide toward the magnetic coil and simultaneously push the drive rod  82  to slide, and the drive rod  82  drives the insulation rod  50  to push the first moving contact  61  and the second moving contact  62  to move in the direction shown by the vertically upward arrow in  FIG. 4 . When the first iron core  81  is in contact with the second iron core  84 , the first moving contact  61  and the second moving contact  62  are respectively pressed against the first fixed contact  21  and the second fixed contact  22 . When the magnetic coil is powered off, there is no electromagnetic force between the second iron core  84  and the first iron core  81 . Under the action of an elastic force of the reset spring  83 , the first iron core  81  is pushed to downward move along a vertically downward arrow shown in  FIG. 4 , and finally returns to an initial position. Simultaneously, the drive rod  82  drives the insulation rod  50  to pull the first moving contact  61  and the second moving contact  62  to be respectively separated from the first fixed contact  21  and the second fixed contact  22 . 
     It can be learned from the foregoing description that when the direct current contactor works, the first moving contact  61  and the second moving contact  62  can be driven, by using only one drive mechanism, to move. Compared with the conventional technology, this reduces drive power consumption of the coil by half; and only a single drive mechanism is needed to drive two contacts, thereby greatly reducing difficulty in implementing closing and opening synchronicity between two electrode contacts. 
     Referring to  FIG. 4 , when the first moving contact  61  and the second moving contact  62  move in a direction shown by the vertically downward arrow, the first moving contact  61  is separated from the first fixed contact  21 , and the second moving contact  62  is separated from the second fixed contact  22 . During separation, an electric arc is generated. Therefore, in the direct current contactor provided in an embodiment of the application, a first magnet  41  and a second magnet  42  are respectively disposed on two opposite sides of an outer sidewall of the first housing. The first magnet  41  is configured to extinguish an electric arc between the first fixed contact  21  and the first moving contact  61 . The second magnet  42  is configured to extinguish an electric arc between the second fixed contact  22  and the second moving contact  62 . When the first magnet  41  and the second magnet  42  are disposed, as shown in  FIG. 3  and  FIG. 4 , a first magnetic pole of the first magnet  41  faces a gap between the first fixed contact  21  and the first moving contact  61 , a second magnetic pole of the second magnet  42  faces a gap between the second fixed contact  22  and the second moving contact  62 , and polarity of the first magnetic pole is opposite to polarity of the second magnetic pole. In  FIG. 3  and  FIG. 4 , an N pole of the first magnet  41  faces the gap between the first moving contact  61  and the first fixed contact  21 , and an S pole of the second magnet  42  faces the gap between the second moving contact  62  and the second fixed contact  22 .  FIG. 5  shows an electric arc direction during arc-extinguishing.  FIG. 5  shows a magnetic field generated by the first magnet  41  and the second magnet  42 , and the electric arc direction during arc-extinguishing. An electric arc generated between the first moving contact  61  and the first fixed contact  21  is downward, and an electric arc generated between the second moving contact  62  and the second fixed contact  22  is upward. Therefore, when the direct current contactor is open, there is no risk of short circuit caused because break arcs cross or are in contact with other electrodes. Therefore, the contact structure can simplify an embodiment of the double-connection arc-extinguishing chamber  10 , so that non-polar arc-extinguishing can be implemented without making a ceramic isolation wall between the two electrode contacts, and only two arc-extinguishing permanent magnets are used. 
       FIG. 6  is a schematic diagram of a structure of another direct current contactor according to an embodiment of this application.  FIG. 7  is a cross-sectional view at A-A in  FIG. 6 . For same reference signs in  FIG. 6  and  FIG. 7 , refer to the descriptions in  FIG. 3  and  FIG. 4 . Details are not described herein again. A main difference between the direct current contactor shown in  FIG. 6  and the direct current contactor shown in  FIG. 3  and  FIG. 4  is a manner in which a moving contact is connected to a fixed contact. In  FIG. 3  and  FIG. 4 , connection and separation between the moving contact and the fixed contact are implemented through sliding of the moving contact relative to the fixed contact. However, in the direct current contactor shown in  FIG. 6 , electrical connection to the fixed contact is implemented through rotating of the moving contact relative to the fixed contact. The following provides detailed descriptions with reference to accompanying drawings. 
     An arc-extinguishing chamber  10  and a drive chamber  90  in  FIG. 6  and  FIG. 7  are disposed in the same manner as the arc-extinguishing chamber  10  and the drive chamber  90  of the direct current contactor shown in  FIG. 3  and  FIG. 4 . Therefore, details are not described herein again. 
     Still referring to  FIG. 6  and  FIG. 7 , a first fixed contact  21 , a second fixed contact  22 , a first moving contact  61 , and a second moving contact  62  that are provided in an embodiment of the application are disposed on a same surface of the arc-extinguishing chamber  10 . The first fixed contact  21  and the second fixed contact  22  are disposed in the same manner as the first fixed contact  21  and the second fixed contact  22  in  FIG. 3 . Details are not described herein again. 
     Still referring to  FIG. 6  and  FIG. 7 , the first moving contact  61  and the second moving contact  62  that are provided in an embodiment of the application are of a same structure. Therefore, the first moving contact  61  is used as an example to describe the structure. The first moving contact  61  provided in an embodiment of the application includes two parts: a first body  611  and a first elastic sheet  612 . The first body  611  is fastened into the arc-extinguishing chamber  10 , and the first body  611  is partially exposed from the arc-extinguishing chamber  10  after penetrating through a sidewall of the arc-extinguishing chamber  10 , and a part that is of the first body  611  and that is exposed from the arc-extinguishing chamber  10  is used as a connecting bar and is configured to be connected to a high-voltage battery pack. A part that is of the first body  611  and that is located in the arc-extinguishing chamber  10  is connected to the first elastic sheet  612 , and the first elastic sheet  612  is configured to be electrically connected to the first fixed contact  21 . As shown in  FIG. 7 , a first end of the first elastic sheet  612  is fastened onto the first body  611 , and the first elastic sheet  612  is electrically connected to the first body  611 . The first elastic sheet  612  spans a gap between the first moving contact  61  and the first fixed contact  21 , and a second end of the first elastic sheet  612  is located below the first fixed contact  21  (a placement direction of the direct current contactor in FIG.  7  is used as a reference direction). During use, the first elastic sheet  612  is elastically deformed, to enable the second end of the first elastic sheet  612  to be pressed against and electrically connected to the first fixed contact  21 , so that the first moving contact  61  is electrically connected to the first fixed contact  21 . 
     Still referring to  FIG. 7 , the first elastic sheet  612  provided in an embodiment of the application is prepared by using a metal sheet with relatively good elastic performance, for example, a common metal sheet with good elasticity and electrical conductivity such as a copper sheet or an aluminum sheet. In addition, in order that the first elastic sheet  612  has a good recovery force, when the first elastic sheet  612  is disposed, as shown in  FIG. 7 , an arc-shaped bend is disposed in a middle area of the first elastic sheet  612 . In  FIG. 7 , although an opening of the arc-shaped bend is downward, the opening of the arc-shaped bend in an embodiment of the application may be alternatively upward. When the first elastic sheet  612  is elastically deformed, a deformed position is mainly in the bend structure. Certainly, in an embodiment of the application, a quantity of bend structures is also not limited, and a plurality of consecutive bend structures may be alternatively used. A quantity may be limited based on an actual requirement. 
     A structure of the second moving contact  62  is the same as the structure of the first moving contact  61 . The second moving contact  62  is also divided into two parts: a second body  621  and a second elastic sheet  622  connected to the second body  621 . A structure of the second moving contact  62  is the same as that of the first moving contact  61 . Details are not described herein. 
       FIG. 8  is a cross-sectional view at B-B in  FIG. 6 . When an insulation rod  50  is disposed, the insulation rod  50  is separately connected to the first elastic sheet  612  and the second elastic sheet  622  through fastening. In addition, the insulation rod  50  is connected to a drive component, to push the first elastic sheet  612  and the second elastic sheet  622  to synchronously move toward the first fixed contact  21  and the second fixed contact  22 . 
     Still referring to  FIG. 7  and  FIG. 8 , when a drive component  80  is disposed, the drive component  80  is configured to drive the insulation rod  50  to drive the first elastic sheet  612  and the second elastic sheet  622  to synchronously rotate toward the first fixed contact  21  and the second fixed contact  22 . The drive component  80  includes a drive rod  82  connected to the insulation rod  50  through fastening, and the drive rod  82  enters the drive chamber  90  by penetrating through the arc-extinguishing chamber  10 . In addition, the drive component  80  further includes an armature  87  and an electromagnet  86  configured to drive the armature  87  to rotate. 
     As shown in  FIG. 7 , the electromagnet  86  includes an iron core  862  disposed in the drive chamber  90 , and a coil  863  wound around the iron core  862 . The iron core  862  is horizontally disposed in the drive chamber  90 , that is, a length direction of the iron core  862  is perpendicular to a stacking direction of the drive chamber  90  and the arc-extinguishing chamber  10 . In addition, the electromagnet  86  further includes a yoke  861  disposed on the coil  863 , and the yoke  861  is fastened onto a side that is of the coil  863  and that faces the arc-extinguishing chamber  10  and is configured to carry the armature  87 . Still referring to  FIG. 7 , the armature  87  is of a V-shaped structure. The armature  87  includes a first part  871  and a second part  872  connected to the first part  871 , and an angle between the first part  871  and the second part  872  is greater than 90 degrees, for example, the angle is different angles between 90° and 180°, such as 120° and 150°. The first part  871  laps on the yoke  861  and is stacked with the yoke  861 . During connection to the drive rod  82 , the drive rod  82  is connected to the first part  871  through fastening. In addition, a reset spring  83  is disposed between a sidewall of the drive chamber  90  and the first part  871 , and the reset spring  83  is configured to push the first part  871  against the yoke  861 . During disposition, two ends of the reset spring  83  are respectively pressed against the sidewall of the drive chamber  90  and the first part  871 . It should be understood that the reset spring  83  shown in  FIG. 7  is merely an example. The reset spring provided in an embodiment of the application is not limited to the structure shown in  FIG. 7 , provided that the reset spring can push the first part  871  against the yoke  861 . 
     Still referring to  FIG. 7 , a connection position between the first part  871  and the second part  872  laps on an edge of the yoke  861 , and the second part  872  is bent downward and faces the iron core  862  of the electromagnet  86 . When the electromagnet  86  is powered on, the electromagnet  86  attracts the second part  872 , and the armature  87  rotates around the edge of the yoke  861  and pushes the drive rod  82  to rotate, to push the first elastic sheet  612  and the second elastic sheet  622  to be respectively electrically connected to the first fixed contact  21  and the second fixed contact  22 . Simultaneously, when the armature  87  rotates, the reset spring  83  is compressed. In addition, because the first elastic sheet  612  and the second elastic sheet  622  can be differently deformed, an assembling error can be overcome, to ensure that the first elastic sheet  612  and the second elastic sheet  622  are respectively reliably connected to the first fixed contact  21  and the second fixed contact  22 . In this case, the first elastic sheet  612  and the second elastic sheet  622  are used as pressing components to provide a contact force for pressing against the first fixed contact  21  and the second fixed contact  22 . When the electromagnet  86  is powered off, the armature  87  is recovered to an initial position by being pushed by the reset spring  83 . Simultaneously, the first elastic sheet  612  and the second elastic sheet  622  are respectively disconnected from the first fixed contact  21  and the second fixed contact  22  by being driven by the drive rod  82 . 
     Still referring to  FIG. 6  and  FIG. 8 , when the first elastic sheet  612  and the second elastic sheet  622  are disconnected, an electric arc is generated. Therefore, an isolating board  11  is disposed in the arc-extinguishing chamber  10  in the direct current contactor provided in an embodiment of the application, to isolate the first moving contact  61  and the first fixed contact  21  from the second moving contact  62  and the second fixed contact  22 , to avoid arc crosstalk. In addition, a third magnet  43  is further disposed outside the housing. As shown in  FIG. 6 , the third magnet  43  is disposed on a sidewall of the arc-extinguishing chamber  10 , and the third magnet  43  is disposed on a sidewall connected to the isolating board  11 . In addition, the electromagnet  86  is connected to a U-shaped magnetic conductive member  44 , and two opposite sidewalls of the U-shaped magnetic conductive member  44  are respectively configured to extinguish an electric arc between the first fixed contact  21  and the first elastic sheet  612  and an electric arc between the second fixed contact  22  and the second elastic sheet  622 . As shown in  FIG. 6 , in the two opposite sidewalls of the magnetic conductive member  44 , one sidewall faces a gap between the first elastic sheet  612  and the first fixed contact  21 , and the other sidewall faces a gap between the second elastic sheet  622  and the second fixed contact  22 . Arc-extinguishing can be quickly performed by using a magnetic field generated by the magnetic conductive member  44 , thereby improving security of the direct current contactor. 
     In addition, an embodiment of this application further provides a vehicle. The vehicle includes a body, a power distribution unit disposed on the body, and the direct current contactor according to any one of the foregoing embodiments that is connected to the power distribution unit. In this application, only two pairs of contacts are used to implement connection/disconnection of two electrode lines, so that a total contactor resistance is reduced by half compared with that in the conventional technology, thereby resolving a problem of a large on-state current loss in the conventional technology. In addition, drive power consumption of the coil  863  is reduced by half; and only a single drive mechanism is needed to drive two contacts, thereby greatly reducing difficulty in implementing closing and opening synchronicity between two electrode contacts. 
     The foregoing descriptions are merely embodiments of the application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by one of ordinary skilled in the art within the technical scope disconnected in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.