DC protectors and electric vehicles

Abstract

This disclosure relates to DC protectors and electric vehicles. The DC protector includes a housing, a moving contact, a stationary contact, and a magnet. The moving contact, stationary contact, and magnet are disposed within the housing. The magnet is arranged such that the magnetic field lines generated by the magnet between the moving and stationary contacts have a direction different from the direction of movement of the moving contact. The magnet, moving contact, and stationary contact are positioned in the same chamber, and the magnet directly faces the moving and stationary contacts. Electric vehicles include the aforementioned DC protector. The DC protector has a simple structure, low cost, high reliability, and long service life.

Description

Technical Field

[0001] This disclosure relates to a DC protector. This disclosure also relates to an electric vehicle including the DC protector. Background Technology

[0002] Traditional DC protectors only have a current interruption function, and the arc generated between the moving and stationary contacts can only be extinguished by itself. Under high voltage conditions (such as 48V), such traditional DC protectors will fail prematurely due to the huge arc energy, failing to meet the product life requirements, and therefore are difficult to use in electric vehicles with high voltage.

[0003] A dual-cavity DC protector with a magnetic arc-extinguishing structure has been developed. However, in this protector, the magnet used for arc extinguishing and the moving and stationary contacts that generate the arc are respectively located in different chambers separated by a partition. In this DC protector, the magnetic field generated by the magnet may be affected by the partition, thus impacting the arc-extinguishing effect. Furthermore, this DC protector requires additional partitions to form a separate chamber to house the magnet, resulting in a complex structure and increased size and manufacturing costs. Therefore, there is room for improvement in this DC protector. Utility Model Content

[0004] In view of this, one of the purposes of this disclosure is to provide a DC protector with a simple structure and good arc extinguishing effect.

[0005] According to one aspect of this disclosure, a DC protector is provided, the DC protector including a housing, a moving contact, a stationary contact, and a magnet, the moving contact, the stationary contact, and the magnet being disposed in the housing, the magnet being arranged such that the direction of the magnetic field lines of the magnetic field generated by the magnet between the moving contact and the stationary contact is different from the direction of movement of the moving contact, wherein the magnet, the moving contact, and the stationary contact are positioned in the same chamber and the magnet directly faces the moving contact and the stationary contact.

[0006] In one configuration, the magnet is positioned on one side of the periphery of the stationary contact, with the N or S pole of the magnet directly facing the moving contact and the stationary contact.

[0007] In one configuration, the magnet is a cylinder with its top and bottom surfaces parallel to each other and both being oblong, wherein the oblong shape is a closed figure composed of two straight line segments and two arcs, wherein the two ends of each arc are respectively connected to one end of a corresponding straight line segment.

[0008] In one configuration, the outer casing has at least one positioning portion for positioning a magnet, the positioning portion including at least one of a protrusion protruding into the cavity and a recess protruding out of the cavity.

[0009] In one configuration, within the housing, the side where the moving contact is located relative to the stationary contact is referred to as the top side, the side opposite to the top side is referred to as the bottom side, the side where the magnet is located is referred to as the front side, the side opposite to the front side is referred to as the rear side, and the left and right sides relative to the front and rear sides are referred to as the left and right sides, respectively. The positioning portion includes side stops formed on the left and right sides of the housing, respectively. The side stops include protrusions protruding into the cavity. The side stops have a stop surface facing the front side, and the stop surface is configured to contact a portion of the rearward-facing surface of the magnet to restrict the movement of the magnet in the rearward direction.

[0010] In one configuration, the stop surface of the side stop includes a curved surface, and the side stop further includes a bottom side surface located on the bottom side of the side stop, the bottom side surface being inclined towards the top side in the direction toward the interior of the cavity.

[0011] In one configuration, the positioning portion further includes a top positioning portion formed on the top side of the housing and a front positioning portion formed on the front side of the housing. The top positioning portion and the front positioning portion include protrusions protruding into the cavity. The protrusions of the top positioning portion and the front positioning portion include stepped portions with flat surfaces. The flat surfaces of the top positioning portions are configured to contact a portion of the top surface of the magnet, and the flat surfaces of the front positioning portions are configured to contact a portion of the front surface of the magnet.

[0012] In one configuration, the flat surfaces of the top positioning portion and the front positioning portion are connected to each other at a corner of the housing, and the flat surfaces of the top positioning portion and the front positioning portion are perpendicular to each other.

[0013] In one configuration, the top positioning portion further includes an inclined surface connected to the flat surface of the top positioning portion, the inclined surface of the top positioning portion being inclined from the flat surface of the top positioning portion toward the top surface of the housing, and the front positioning portion further includes an inclined surface connected to the flat surface of the front positioning portion, the inclined surface of the front positioning portion being inclined from the flat surface of the front positioning portion toward the front surface of the housing.

[0014] In one configuration, the positioning portion further includes a bottom positioning portion formed on the bottom side of the housing, the bottom positioning portion protruding from the inside of the chamber to the outside of the chamber to form a recess on the inner wall of the housing, in which the magnet is placed.

[0015] In one configuration, the positioning portion is formed by stamping.

[0016] In one configuration, a bimetallic disc is further disposed within the housing, the moving contact is coupled to the housing via the bimetallic disc, and the magnet is positioned on the side of the stationary contact opposite to the bimetallic disc.

[0017] In one configuration, the housing includes a first housing and a second housing, the first housing being joined to the second housing insulated from each other by an insulating pad, the moving contact being coupled to the first housing via the bimetallic disc, and the stationary contact being fixed to the second housing, the first housing being made of a ferromagnetic material, and the second housing being made of a ferromagnetic or non-ferromagnetic material.

[0018] According to another aspect of this disclosure, an electric vehicle is provided, which includes the DC protector as described above.

[0019] The DC protector disclosed herein has a simple structure, low manufacturing cost, and good arc extinguishing effect, thus exhibiting high reliability and long product life.

[0020] Other features and advantages of this disclosure will become clear from the following description with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings are for illustrative purposes and are intended only to provide examples of possible structures and arrangements of the disclosed apparatus herein. These drawings are in no way intended to limit any changes in form and detail that may be made to the embodiments by those skilled in the art without departing from the spirit and scope of the embodiments. The embodiments will be more readily understood from the following detailed description taken in conjunction with the accompanying drawings, wherein similar reference numerals denote similar structural elements.

[0022] Figure 1 A schematic perspective view of a DC protector cut open according to this disclosure is shown.

[0023] Figure 2 A schematic partial perspective view of a DC protector cut open according to this disclosure is shown.

[0024] Figure 3 It shows from Figure 2 A schematic cross-sectional view of the DC protector, cut and observed from the right side.

[0025] Figure 4 A schematic cross-sectional view of a DC protector according to another embodiment of the present disclosure is shown, which is consistent with... Figure 3 The cutting position and observation angle are the same.

[0026] Figure 5 A schematic top view of a DC protector cut open according to this disclosure is shown.

[0027] Figure 6 A schematic perspective view of a DC protector according to this disclosure, cut open, is shown relative to... Figure 1 It is placed upside down, and some parts are not shown in order to clearly show them.

[0028] Figure 7 A partial cross-sectional view of a DC protector according to this disclosure is shown, relative to... Figure 1 Place them upside down.

[0029] Note that in the embodiments described below, the same reference numerals are sometimes used across different figures to denote the same parts or parts having the same function, and repeated descriptions are omitted. In this specification, similar reference numerals and letters are used to denote similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0030] For ease of understanding, the positions, dimensions, and extents of the structures shown in the accompanying drawings and other materials may not represent their actual positions, dimensions, and extents. Therefore, the disclosure is not limited to the positions, dimensions, and extents disclosed in the accompanying drawings and other materials. Furthermore, the drawings are not necessarily drawn to scale, and some features may be enlarged to show details of specific components. Detailed Implementation

[0031] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical values ​​of the components set forth in these embodiments do not limit the scope of the present disclosure.

[0032] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. Those skilled in the art will understand that they merely illustrate exemplary ways that can be used to implement this disclosure, and are not exhaustive.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] It should also be understood that when the term “including / having” is used herein, it indicates the presence of the indicated feature, whole, step, operation, unit and / or component, but does not preclude the presence or addition of one or more other features, wholes, steps, operations, units and / or components and / or combinations thereof.

[0035] Unless otherwise stated, the directional terms “upper,” “lower,” “top,” “bottom,” “left,” “right,” “front,” “back,” etc., used in this disclosure refer to relative positions in the states shown in the accompanying drawings, and do not constitute any limitation on the absolute position of the product.

[0036] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0037] Figure 1 A schematic diagram of a DC protector according to this disclosure is shown. The DC protector can be used in electric vehicles. In particular, the DC protector can be used in electric vehicles employing high DC voltages (above 24V, e.g., 48V).

[0038] like Figure 1 As shown, the DC protector includes a housing. The DC protector also includes a moving contact 3, a stationary contact 4, and a magnet 6 arranged within the housing. The magnet 6 is arranged such that the direction of the magnetic field lines it generates between the moving contact 3 and the stationary contact 4 is different from the direction of movement of the moving contact 3. The magnet 6, moving contact 3, and stationary contact 4 are positioned in the same chamber. This means that the magnet 6, moving contact 3, and stationary contact 4 are positioned in the same relatively enclosed space. The magnet 6 can directly face the moving contact 3 and stationary contact 4. This means that the magnet 6 and the moving contact 3 and stationary contact 4 face each other without any other object obstructing their view.

[0039] When the moving contact 3 moves to disconnect the DC protector, an electric arc is generated between the moving contact 3 and the stationary contact 4. Since the direction of the magnetic field lines is different from the direction of the electric arc, the electric arc is subjected to a Lorentz force perpendicular to the direction of the arc, causing the arc to be stretched by a lateral force and thus extinguished quickly.

[0040] In the DC protector disclosed herein, since the magnet 6, moving contact 3, and stationary contact 4 are positioned in the same chamber, the magnet 6 can be closer to the moving and stationary contacts where the arc occurs, thereby improving the arc extinguishing effect. This arrangement is also simple, reducing manufacturing costs, simplifying the process, and decreasing product size. Because the magnet 6 directly faces the moving and stationary contacts 3 and 4, the magnetic field generated by the magnet 6 can interact more directly with the generated arc, further improving the arc extinguishing effect, simplifying the structure, and reducing costs. Additionally, since the magnet is built into a chamber defined by the outer shell, magnetic adsorption between different DC protector products is reduced, which is beneficial for logistics and packaging during production.

[0041] In a construction, such as Figure 1 As shown, the housing of the DC protector may include a first housing 10 and a second housing 70. The first housing 10 is insulated from the second housing 70 by an insulating pad 5 to define the aforementioned chamber within the first housing 10 and the second housing 70. The first housing 10 has a first terminal 11. The second housing 70 has a second terminal 73. The first terminal 11 and the second terminal 73 are used for connection to an external device such as a PCB board. The second housing 70 may include a first plate 71 and a second plate 72 that are separate from each other.

[0042] The chamber also houses a heating element 9 and a bimetallic disc 2. The heating element 9 can be implemented using a heating wire. The two ends of the heating element 9 are respectively connected to the first plate 71 and the second plate 72. The bimetallic disc 2 can be composed of at least two layers of metal with different coefficients of thermal expansion. A moving contact 3 is coupled to the first housing 10 via the bimetallic disc 2. In one configuration, the moving contact 3 can be coupled to the first housing 10 at a connection 12 via a metal block 10 by welding (e.g., resistance welding). A stationary contact 4 is fixed to the second housing 70. For example, the stationary contact 4 is welded to the first plate 71. The first housing 10 may also have a calibration area 13 corresponding to the bimetallic disc 2 for device calibration.

[0043] When the DC protector is operating normally, the moving contact 3 is in contact with the stationary contact 4, and the current flows sequentially through the bimetallic disc 2, the moving contact 3, the stationary contact 4, and the heating element 9. When the current is overloaded, the heating element 9 generates a large amount of heat, causing significant deformation of at least two layers of metal in the bimetallic disc 2. This difference in deformation between the different layers causes the bimetallic disc 2 to bend, resulting in the separation of the moving contact 3 and the stationary contact 4. In this way, the DC protector automatically disconnects.

[0044] The magnet 6 can be positioned on one side of the periphery of the stationary contact 4. The magnet 6 can be positioned adjacent to the stationary contact 4, directly facing the moving contact 3 and the stationary contact 4. For ease of description only, in the following description, the housing will be referred to as... Figure 1 The side where the moving contact 3 is located relative to the stationary contact 4 is called the top side, the side opposite to the top side is called the bottom side, the side where the magnet 6 is located is called the front side, the side opposite to the front side is called the rear side, and the two sides located on the left and right relative to the front and rear sides are called the left side and the right side, respectively.

[0045] exist Figure 1In the example shown, the magnet 6 is positioned relative to the stationary contact 4 on the side opposite to the heating element 9 and the bimetallic disc 2. That is, the magnet 6 is positioned in front of the stationary contact 4, while the heating element 9 and the bimetallic disc 2 are positioned behind. This arrangement facilitates the positioning of the magnet 6, makes the DC protector structure more compact, and avoids affecting the arrangement of other components.

[0046] like Figure 2 and Figure 3 As shown, in one embodiment, the S pole of magnet 6 faces forward, and the N pole faces backward. That is, the N pole of magnet 6 directly faces the moving contact 3 and the stationary contact 4. Magnet 6 generates magnetic field lines that extend from the N pole in a direction approximately perpendicular to the direction of movement of the moving contact 3, passing through the area between the moving contact 3 and the stationary contact 4. Based on the left-hand rule, the electric arc generated between the moving contact 3 and the stationary contact 4 along the F1 direction will be deflected in the F2 direction under the influence of the Lorentz force. That is, the electric arc will deflect to the left, thus elongating and then extinguishing at a lateral position. In this arrangement, the magnet can directly face the moving contact 3 and the stationary contact 4 in a very close manner, and the magnetic field lines generated by the magnet can directly pass through the arc-generating area in a direction intersecting (e.g., approximately perpendicular) to the direction of arc propagation, thus achieving a better arc-extinguishing effect. This reduces the direct impact of electric arc on the contacts, extends the life of the contact material, and enables small-volume and thin-silver-layer contacts to be achieved under high-voltage conditions, reducing the use of precious metal materials and saving costs.

[0047] Magnet 6 can also be installed in reverse. That is, the S pole of magnet 6 can be directly facing the moving contact 3 and the stationary contact 4. In this case, such as Figure 4 As shown, the magnetic field lines will extend in a direction approximately perpendicular to the direction of movement of the moving contact 3, passing through the region between the moving contact 3 and the stationary contact 4, and returning to the S pole of the magnet 6. Based on the left-hand rule, as... Figure 4 As shown, the electric arc generated between the moving contact 3 and the stationary contact 4 along the F1 direction will be deflected in the F2 direction, opposite to the aforementioned deflection direction, under the influence of the Lorentz force. That is, the arc will deflect to the right, elongating at a lateral position and then extinguishing, thus achieving the same arc-extinguishing effect as when the magnet 6 is installed facing forward. This error-proof design facilitates automated assembly and improves production efficiency.

[0048] Magnet 6 can be a cylinder. Viewed with magnet 6 positioned within the chamber of the DC protector, the first surface facing forward and the second surface facing backward of magnet 6 can be parallel to each other. The third surface facing top and the fourth surface facing bottom of magnet 6 can be parallel to each other. The first and second surfaces can be planes. The third and fourth surfaces can be planes. The first side surface on the left and the second side surface on the right of magnet 6 can be curved surfaces. In one configuration, such as... Figure 5 As shown, the third and fourth surfaces of magnet 6 can be elongated ovals. The elongated oval is a closed shape composed of two straight line segments and two arcs, where each arc's ends are connected to one end of a corresponding straight line segment. The shape of magnet 6 can match the shape of the inner wall of the first housing 10. This shape allows for better positioning of the magnet and also facilitates magnetic field propagation. This shape also facilitates correct installation, ease of processing, and mass production.

[0049] At least one positioning portion is formed on the housing of the DC protector. The positioning portion is configured to position the magnet 6 within the housing. That is, the positioning portion is configured to limit the relative movement of the magnet 6 relative to the housing. The positioning portion may include at least one of a protrusion projecting into the cavity and a recess projecting out of the cavity. Through the positioning portion, the magnet 6 is reliably positioned within the housing, thus achieving precise matching between the magnet position and the position required for arc extinguishing, ensuring a reliable arc extinguishing effect. Furthermore, since the positioning of the magnet 6 requires no additional components, costs are reduced, the manufacturing process is simplified, and miniaturization is possible. The positioning portion can be formed by stamping on the housing, thus achieving reliable positioning of the magnet through a simple process.

[0050] The positioning portion may include side stop portions 16 formed on the left and right sides of the first housing 10. For example... Figure 5 As shown, a side stop 16 can be provided on both the left and right sides of the first housing 10. However, the number of side stop 16 is not limited to this, and multiple side stop 16 can be provided on both the left and right sides of the first housing 10.

[0051] The side stop 16 can be configured to restrict the movement and tilting of the magnet 6 in the rearward direction. The side stop 16 may include a protrusion extending into the cavity. The side stop 16 can be formed by stamping the left and right sides of the first housing inward.

[0052] In one configuration, each side stop 16 has a stop surface. The stop surface can be the front-facing surface of the side stop 16. The stop surface can contact the rear-facing second surface and / or corresponding first / second side surfaces (curved surfaces) of the magnet 6, thereby restricting the movement and tilting of the magnet 6 in the rearward direction. The shape of the stop surface of the side stop 16 can be formed to match the shape of the surface of the magnet 6 to be in contact with the stop surface. In one configuration, the shape of the stop surface of the side stop 16 can be formed to match the curved shape of the side surface of the magnet. For this purpose, the side stop 16 can be stamped such that its surface bulging into the housing (the surface extending in the vertical direction) includes a curved surface. This not only achieves good stopping and positioning but also facilitates the propagation of the magnet's magnetic field. Furthermore, as... Figure 6 As shown, the bottom surface 161 of the side stop 16 located on the bottom side can be an inclined surface that slopes upward (i.e., towards the top side) in the direction toward the interior of the cavity. This also facilitates the propagation of the magnetic field of the magnet to the arc-generating region and provides better stamping machinability.

[0053] In addition, such as Figure 6 As shown, the height of each side stop 16 in the vertical direction from the top to the bottom can be set to be less than the height of the magnet 6 in the vertical direction. The length of each side stop 16 in the horizontal direction can be set to be less than half the length of the magnet 6 in the horizontal direction. To ensure stopping, the height and length of the side stop 16 can be set as small as possible. This ensures that the side stop 16 only contacts a portion, rather than the entire surface of the magnet 6 facing the moving contact 3, which is beneficial for the propagation of the magnet's magnetic field.

[0054] like Figure 6 and Figure 7 As shown, the positioning part may further include a top positioning part 14 formed on the top side of the first housing 10 and a front positioning part 15 formed on the front side of the first housing 10. The top positioning part 14 and the front positioning part 15 can respectively restrict the movement of the magnet 6 in the direction toward the top side and the direction toward the front side.

[0055] The top positioning portion 14 and the front positioning portion 15 can be protrusions projecting into the cavity. The top positioning portion 14 can be formed by stamping the top of the first housing towards the interior of the housing. The front positioning portion 15 can be formed by stamping the front side of the first housing towards the interior of the housing. The protrusions of the top positioning portion 14 and the front positioning portion 15 can include stepped portions with flat surfaces. The flat surface of the top positioning portion 14 can be substantially parallel to the top surface of the first housing 10. The flat surface of the front positioning portion 15 can be substantially parallel to the front surface of the first housing 10. When the magnet 6 is positioned in the cavity, the third surface of the magnet 6 facing the top can contact the flat surface of the stepped portion of the top positioning portion 14, and the first surface of the magnet 6 facing the front can contact the flat surface of the stepped portion of the front positioning portion 15. This restricts the movement and tilting of the magnet 6 in the direction towards the top and the direction towards the front. Figure 1 , Figure 6 and Figure 7 As shown, the flat surfaces of the top positioning portion 14 and the front positioning portion 15 are connected to each other at the corner of the first housing 10. The flat surfaces of the top positioning portion 14 and the front positioning portion 15 can be approximately perpendicular to each other. This allows for more reliable positioning of the magnet 6.

[0056] In one configuration, the flat surface of the top positioning portion 14 contacts only a portion of the third surface of the magnet 6. The flat surface of the front positioning portion 15 contacts only a portion of the first surface of the magnet 6. Thus, gaps exist between the third surface of the magnet 6 and the inner surface of the top side of the first housing, and between the first surface of the magnet 6 and the inner surface of the front side of the first housing, thereby facilitating better propagation of the magnet's magnetic field.

[0057] Specifically, the length of the flat surface of the top positioning portion 14 in the left-right direction of the DC protector's housing is less than the length of the magnet 6 in the left-right direction. As a non-limiting example, the length of the flat surface of the top positioning portion 14 in the left-right direction of the DC protector's housing can be 1 / 2, 1 / 3, 1 / 4, 1 / 5, 2 / 3, or 2 / 5 of the length of the magnet 6 in the left-right direction. The width of the flat surface of the top positioning portion 14 in the front-back direction of the DC protector's housing is less than the width of the magnet 6 in the front-back direction. As a non-limiting example, the width of the flat surface of the top positioning portion 14 in the front-back direction of the DC protector's housing can be 1 / 2, 1 / 3, 1 / 4, 2 / 3, 2 / 5, 3 / 5, or 3 / 4 of the width of the magnet 6 in the front-back direction.

[0058] The length of the flat surface of the front positioning part 15 in the left-right direction of the DC protector's housing is less than the length of the magnet 6 in the left-right direction. As a non-limiting example, the length of the flat surface of the front positioning part 15 in the left-right direction of the DC protector's housing can be 1 / 2, 1 / 3, 1 / 4, 1 / 5, 2 / 3, or 2 / 5 of the length of the magnet 6 in the left-right direction. The height of the flat surface of the front positioning part 15 in the vertical direction of the DC protector's housing is less than the height of the magnet 6 in the vertical direction. As a non-limiting example, the height of the flat surface of the front positioning part 15 in the vertical direction of the DC protector's housing can be 1 / 2, 1 / 3, 1 / 4, 2 / 3, 2 / 5, 3 / 5, or 3 / 4 of the height of the magnet 6 in the vertical direction.

[0059] like Figure 6 and Figure 7 As shown, the top positioning portion 14 may further include an inclined surface 141 connected to the flat surface of the top positioning portion 14. The inclined surface 141 is inclined from the flat surface of the top positioning portion 14 toward the top surface of the first housing 10. The front positioning portion 15 may further include an inclined surface 151 connected to the flat surface of the front positioning portion 15. The inclined surface 151 is inclined from the flat surface of the front positioning portion 15 toward the front surface of the first housing 10. The arrangement of the inclined surfaces 141 and 151 can further facilitate the propagation of the magnetic field and give the product better stamping processability.

[0060] like Figure 1 and Figure 7As shown, the positioning portion may further include a bottom positioning portion 74 formed on the second housing 70 (e.g., the first plate 71 of the second housing 70). The bottom positioning portion 74 may include a boss protruding from the inside of the chamber to the outside of the chamber. The boss forms a recess in the inner wall of the second housing 70. The magnet 6 is placed in the recess. The boss may be formed by stamping. The bottom positioning portion 74 may cooperate with other positioning portions to restrict the remaining degrees of freedom of movement of the magnet 6, thereby further ensuring reliable positioning of the magnet within the housing.

[0061] In one configuration, the first housing 10 may be made of a ferromagnetic material. This provides electromagnetic shielding, preventing electromagnetic interference from the external environment to the components inside the housing 1. Preferably, the first housing 10 may be formed of low-carbon steel, such as cold-rolled steel. This material has good deep-drawing properties and good compatibility with existing equipment and processes, reducing costs.

[0062] In one configuration, the second housing 70 can be made of a non-ferromagnetic material, such as stainless steel. This reduces the impact on the distribution of the magnetic field generated by the magnet 6. Alternatively, the second housing 70 can also be made of a ferromagnetic material, such as low-carbon steel like cold-rolled steel. This allows the first and second housings to form a magnetic circuit shield, preventing external magnetic interference.

[0063] In one configuration, the first terminal 11 and the second terminal 73 may be tin-plated to ensure good solderability with the PCB board.

[0064] This disclosure also relates to an electric vehicle that includes the DC protector as described above. Electric vehicles including the aforementioned DC protector are suitable for high DC voltages and achieve high reliability with small size and low cost.

[0065] While specific embodiments of this disclosure have been illustrated in detail by way of example, those skilled in the art will understand that the examples are intended to be illustrative only and do not limit the scope of this disclosure. Those skilled in the art will understand that the embodiments described above can be modified without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A DC protector comprising a housing, a movable contact, a stationary contact and a magnet, the movable contact, stationary contact and magnet being arranged in the housing, the magnet being arranged such that the direction of the magnetic field lines of the magnetic field generated by the magnet between the movable contact and the stationary contact is different from the direction of movement of the movable contact, characterized in that The magnet, the moving contact, and the stationary contact are positioned in the same chamber, and the magnet directly faces the moving contact and the stationary contact.

2. The DC protector of claim 1, wherein, The magnet is positioned on one side of the periphery of the stationary contact, with the N or S pole of the magnet directly facing the moving contact and the stationary contact.

3. The DC protector of claim 1, wherein, The magnet is a cylinder with its top and bottom surfaces parallel to each other and both being oblong. Each oblong is a closed shape composed of two straight line segments and two arcs, with each arc connected to one end of a corresponding straight line segment.

4. The DC protector of claim 1, wherein, The outer casing has at least one positioning portion for positioning a magnet, the positioning portion including at least one of a protrusion protruding into the cavity and a recess protruding out of the cavity.

5. The DC protector according to claim 4, characterized in that, In the housing, the side where the moving contact is located relative to the stationary contact is called the top side, the side opposite to the top side is called the bottom side, the side where the magnet is located is called the front side, the side opposite to the front side is called the rear side, and the sides located on the left and right relative to the front and rear sides are called the left side and right side, respectively. The positioning part includes side stop portions formed on the left and right sides of the housing, respectively. The side stop portions include protrusions that protrude into the cavity. The side stop portions have a stop surface facing the front side. The stop surface is configured to contact a portion of the rearward-facing surface of the magnet to restrict the movement of the magnet in the rearward direction.

6. The DC protector of claim 5, wherein, The stop surface of the side stop includes a curved surface, and the side stop also includes a bottom side surface located on the bottom side of the side stop, the bottom side surface being inclined towards the top side in the direction toward the interior of the cavity.

7. The DC protector of claim 5, wherein, The positioning portion further includes a top positioning portion formed on the top side of the housing and a front positioning portion formed on the front side of the housing. The top positioning portion and the front positioning portion include protrusions protruding into the cavity. The protrusions of the top positioning portion and the front positioning portion include stepped portions with flat surfaces. The flat surface of the top positioning portion is configured to contact a portion of the top surface of the magnet, and the flat surface of the front positioning portion is configured to contact a portion of the front surface of the magnet.

8. The DC protector of claim 7, wherein, The flat surfaces of the top positioning portion and the front positioning portion are connected to each other at the corner of the housing, and the flat surfaces of the top positioning portion and the front positioning portion are perpendicular to each other.

9. The DC protector of claim 7, wherein, The top positioning portion further includes an inclined surface connected to the flat surface of the top positioning portion, the inclined surface of the top positioning portion being inclined from the flat surface of the top positioning portion toward the top surface of the housing, and the front positioning portion further includes an inclined surface connected to the flat surface of the front positioning portion, the inclined surface of the front positioning portion being inclined from the flat surface of the front positioning portion toward the front surface of the housing.

10. The DC protector of claim 7, wherein, The positioning portion further includes a bottom positioning portion formed on the bottom side of the housing, the bottom positioning portion protruding from the inside of the chamber to the outside of the chamber to form a recess on the inner wall of the housing, the magnet being placed in the recess.

11. The DC protector according to any one of claims 4-10, characterized in that, The positioning part is formed by stamping.

12. The DC protector of any one of claims 2-10, wherein, The housing also contains a bimetallic disc, the moving contact is coupled to the housing via the bimetallic disc, and the magnet is positioned on the side of the stationary contact opposite to the bimetallic disc.

13. The DC protector according to claim 12, characterized in that, The housing includes a first housing and a second housing, the first housing being joined to the second housing insulated from each other by an insulating pad, the moving contact being coupled to the first housing via the bimetallic disc, and the stationary contact being fixed to the second housing, the first housing being made of a ferromagnetic material, and the second housing being made of a ferromagnetic or non-ferromagnetic material.

14. An electric vehicle, characterized by The electric vehicle includes a DC protector as described in any one of claims 1-13.

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