Capacitor

Abstract

The utility model discloses a capacitor. The capacitor comprises a first busbar and a capacitor core. The first busbar is provided with a first plate body and a second plate body, and the first plate body is provided with an electrode terminal part connected with the capacitor core and a first switching part which is bent and extends from the electrode terminal part to the side surface of the capacitor core; the second plate body is provided with a second switching part which is connected with the first switching part in an overlapping manner, an inclined part which is bent and obliquely extended from the overlapping end of the second switching part, and a first connecting terminal part which is bent and horizontally extended from the end part of the inclined part, and the first connecting terminal part is suitable for being connected with an external terminal; the inclined part and the electrode end face of the capacitor core form an acute included angle. Therefore, the influence of an external heat source on the film capacitor core can be greatly reduced, and the thermal stability of the film capacitor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor. Background Art

[0002] With the rapid development of power electronics technology, metallized film capacitors have been widely used in the field of new energy vehicles, and the requirements for capacitor product performance are becoming increasingly higher.

[0003] In new energy vehicle controllers, the temperature resistance of film capacitors is often a bottleneck, and the temperature resistance of accessories connected to film capacitors is usually greater than that of film capacitors. Figure 1 In the conventional film capacitor structure shown, since the lead electrodes are generally made of metal and have a relatively high thermal conductivity, when the accessories connected to the lead electrodes generate severe heat, the heat will quickly be introduced into the core through the lead electrodes, causing thermal damage to the film capacitor core. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the above technology at least to a certain extent. To this end, the purpose of the utility model is to provide a capacitor, which can significantly reduce the influence of external heat sources on the film capacitor core and improve the thermal stability of the film capacitor.

[0005] To achieve the above object, an embodiment of the utility model provides a capacitor, which includes a first busbar and a capacitor core;

[0006] The first busbar comprises a first plate body and a second plate body, the first plate body comprising an electrode terminal portion connected to the capacitor core, and a first transition portion bent and extended from the electrode terminal portion toward a side surface of the capacitor core; the second plate body comprising a second transition portion overlapped and connected with the first transition portion, an inclined portion bent and obliquely extended from an overlapping end of the second transition portion, and a first connecting terminal portion bent and horizontally extended from an end portion of the inclined portion, the first connecting terminal portion being suitable for connection to an external terminal, and the inclined portion forming an acute angle with an electrode end surface of the capacitor core.

[0007] According to a capacitor of an embodiment of the utility model, an inclined portion is provided, and the inclined portion forms an acute angle with the electrode end surface of the capacitor core, so that a larger gap exists between the connecting terminal portion (lead-out electrode) and the capacitor core. When a heat source exists in the lead-out electrode, the existence of the gap has a better heat insulation effect, which can greatly reduce the influence of the external heat source on the film capacitor core and improve the thermal stability of the film capacitor.

[0008] Optionally, comprising a second busbar and a housing;

[0009] The second busbar is opposite to the first busbar and draws power from the capacitor core, and the second busbar has a first overlapping portion overlapping the second transition portion, a second overlapping portion overlapping the inclined portion, and a second connection terminal portion bent and horizontally extended from the second overlapping portion;

[0010] The housing has a receiving cavity for receiving the capacitor core connected with the first busbar and the second busbar, and a heat sink is installed on one side of the housing where the first overlapping portion is located. In this way, the heat source outside the electrode is drawn out and enters the path of the capacitor core, which is first cooled by the heat sink before contacting the capacitor core, which can further reduce the influence of the external heat source on the film capacitor core and improve the thermal stability of the film capacitor.

[0011] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A cross-sectional view of a capacitor of the prior art;

[0013] Figure 2 A three-dimensional diagram of a capacitor according to an embodiment of the present utility model;

[0014] Figure 3 It is a schematic diagram of the inside of a capacitor involved in an embodiment of the utility model;

[0015] Figure 4 is a cross-sectional view of a capacitor according to an embodiment of the present utility model;

[0016] Figure 5 A schematic diagram of a capacitor element assembly according to an embodiment of the present utility model;

[0017] Figure 6 is a schematic diagram of another viewing angle of a capacitor element assembly according to an embodiment of the present utility model;

[0018] Figure 7 It is a partial exploded view of a capacitor according to an embodiment of the present utility model.

[0019] Description of labels:

[0020] Capacitor core 100, side surface 101, electrode end surface 102;

[0021] The first busbar 200, the first plate 210, the first electrode terminal portion 211, the first transition portion 212, the second plate 220, the second transition portion 221, the inclined portion 222, and the first connection terminal portion 223;

[0022] A second busbar 300, a second electrode terminal portion 301, a first stacking portion 302, a second stacking portion 303, a second connection terminal portion 304, and a through hole 305;

[0023] Shell 400, accommodating cavity 401, first through hole 402, second through hole 403;

[0024] Filling resin 500;

[0025] Heat sink 600;

[0026] A first insulating sheet 701 , a second insulating sheet 702 , and a third insulating sheet 703 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following is combined with Figure 1-Figure 7 The capacitor according to the embodiment of the present utility model is described in detail.

[0029] like Figure 1-Figure 3 As shown, the capacitor according to the embodiment of the present invention includes a capacitor core 100 , a first bus bar 200 , a second bus bar 300 , a housing 400 and a filling resin 500 .

[0030] Specifically, combined Figure 3 The first busbar 200 has a first plate body 210 and a second plate body 220. The first plate body 210 has a first electrode terminal portion 211 connected to the capacitor core 100, and a first transition portion 212 bent and extended from the electrode terminal portion 211 to the side surface 101 of the capacitor core 100 (the side surface can be understood as one of the circumferential surfaces connecting the two electrode end surfaces 102 of the capacitor core 100); the second plate body 220 has a second transition portion 221 overlapped and connected with the first transition portion 212, an inclined portion 222 bent and obliquely extended from the overlapping end of the second transition portion 221, and a first connection terminal portion 223 bent and horizontally extended from the end of the inclined portion 222, the first connection terminal portion 223 is suitable for connection with an external terminal, and the inclined portion 222 forms an acute angle with the electrode end surface 102 (gold-sprayed surface) of the capacitor core 100.

[0031] In other words, compared to Figure 1As shown in the existing conventional capacitor, the first busbar 200 of the capacitor of this embodiment is formed by the cooperation of the first plate body 210 and the second plate body 220, so that the plate body arranged with the connection terminal part is separated from the plate body arranged with the electrode terminal part.

[0032] Therefore, according to a capacitor of an embodiment of the utility model, the inclined portion 222 is set, and the inclined portion 222 forms an acute angle with the electrode end surface 102 of the capacitor core 100, so that there is a large gap between the connecting terminal portion (lead-out electrode) and the capacitor core 100. When there is a heat source at the lead-out electrode, the existence of the gap has a better heat insulation effect, which can greatly reduce the influence of the external heat source on the film capacitor core and improve the thermal stability of the film capacitor.

[0033] The above implementation is the most basic solution of this application, which can solve the problems raised in the background technology and achieve the purpose of this application. The following improves the above basic solution in many aspects to further improve its performance, thereby achieving better implementation effect.

[0034] Figure 2 This is a schematic diagram of the inside of a film capacitor without the resin filling. Figure 2 As shown, the film capacitor includes a plurality of capacitor cores 100, a first busbar 200, a second busbar 300, and a housing 400. The capacitor element assembly is formed by assembling the plurality of capacitor cores 100, the first busbar 200, and the second busbar 300 into one body, and then the capacitor element assembly is accommodated in the accommodation cavity 401 of the housing 400. Then, the housing 400 is filled with a filling resin 500, and the resin 500 is a thermosetting resin, so that the portion of the capacitor element assembly buried in the resin is protected by the housing 400 and the resin 500 from moisture and collision.

[0035] Combination Figure 4 and Figure 5 The capacitor core 100 includes two end faces and a peripheral surface connecting the two end faces. The capacitor core 100 as a whole adopts a shape close to a flat cylinder. An end face electrode is formed on one end face of the capacitor core 100 by spraying a metal such as zinc, and another end face electrode is formed on the other end face by spraying the same metal such as zinc. Several capacitor cores 100 are arranged in the left and right directions so that the two end face electrodes face forward and backward respectively. In this state, several capacitor cores 100 are connected to the first busbar 200 and the second busbar 300.

[0036] The first plate 210 and the second plate 220 of the first busbar 200 are formed by appropriately cutting and bending a conductive material such as a copper plate. The first electrode terminal portion 211 has a strip-shaped plate shape and extends from one edge of the first plate 210. A plurality of first electrode terminal portions 211 may be provided on the first plate 210. The plurality of first electrode terminal portions 211 are suitable for correspondingly fitting and connecting with the electrode end faces 102 of a plurality of capacitor cores 100. The first plate 210 then extends vertically downward from the first electrode terminal portion 211 and is bent at the connection between the electrode end face 102 and the side face 101 of the corresponding capacitor core 100, and then continues to extend along the side face 101 of the capacitor core 100 to form a first transition portion 212.

[0037] The second plate 220 includes a second transition portion 221, an inclined portion 222, and a first connection terminal portion 223. The second transition portion 221 overlaps and fits with the first transition portion 212, so that the second plate 220 with the connection terminal portion is connected to the first plate 210 with the electrode terminal portion, so that the power of the capacitor core 100 can be led out; the second transition portion 221 is bent at the overlapping end and extends the inclined portion 222 upward, so that the first connection terminal portion 223 is led out of the housing 400 through the bending, and the inclined portion 222 separates the second plate 220 with the connection terminal portion from the first plate 210 with the electrode terminal portion.

[0038] More specifically, the inclined portion 222 is inclined in a manner of moving away from the first electrode terminal portion 211 , so that a larger gap can exist between the lead-out electrode and the core, thereby achieving a better heat insulation effect.

[0039] The first transition portion 212 and the second transition portion 221 may be connected by welding.

[0040] Combination Figure 5 The second busbar 300 is also formed by appropriately cutting and bending a conductive material such as a copper plate. The second busbar 300 has a second electrode terminal portion 301, a first overlapping portion 302 overlapping the second transition portion 221, a second overlapping portion 303 overlapping the inclined portion 222, and a second connection terminal portion 304 bent and horizontally extended from the second overlapping portion 303. The second electrode terminal portion 301 has a strip-shaped plate shape and extends outward from one edge of the busbar body. A plurality of second electrode terminal portions 301 can be provided on the busbar body. The plurality of second electrode terminal portions 301 are suitable for correspondingly fitting and connecting with the electrode ends of a plurality of capacitor cores 100.

[0041] The first overlapping portion 302 extends vertically downward from the second electrode terminal portion 301 and is bent at the connection between the other electrode end surface 102 of the corresponding capacitor core 100 and the side surface 101, and then continues to extend along the side surface 101 of the capacitor core 100; the first overlapping portion 302 is then bent from the connection between the electrode end surface 102 and the side surface 101 of the corresponding capacitor core 100 and extends obliquely upward to form the second overlapping portion 303, and the second overlapping portion 303 is then bent and extended horizontally to form the second connection terminal portion 304.

[0042] For the second connection terminal parts 304 , a plurality of second connection terminal parts 304 are arranged at intervals along the length direction of the busbar body (ie, the left-right arrangement direction of the plurality of capacitor cores 100 ), and each second connection terminal part 304 is formed by bending and led out of the housing 400 .

[0043] After being guided out of the housing 400, the first connection terminal portions 201 and the second connection terminal portions 304 are arranged at intervals in the horizontal direction (i.e., the left-right arrangement direction of the capacitor cores 100). More specifically, the first connection terminal portions 201 and the second connection terminal portions 304 are arranged alternately in the horizontal direction.

[0044] For the shell 400, the bottom surface of the shell 400 is provided with a first through hole 402, and the front end surface is provided with a second through hole 403, and the first connection terminal part 201 and the second connection terminal part 304 are both led out from the second through hole 403 to the outside of the accommodating cavity 401. The first through hole 402 is sealed by the heat sink 600. Specifically, the heat sink 600 abuts against the inner wall surface around the first through hole 402 to seal the first through hole 402 of the shell 400. Among them, the heat sink 600 can be a metal plate, such as an aluminum plate. Therefore, the heat source outside the electrode is led out and enters the path of the capacitor core 100. It will first be cooled by the heat sink 600 before contacting the capacitor core 100, which can further reduce the influence of the external heat source on the film capacitor core and improve the thermal stability of the film capacitor. That is, the heat source of the connection terminal portion is transferred to the heat sink 600 through the inclined portion 222 , the second transition portion 221 , and the first overlapping portion 302 for cooling, and then contacts the capacitor core 100 .

[0045] Furthermore, the first transition portion 212 extends to cover nearly half of the height of the side surface 101 of the capacitor core 100 (the height can be considered as the distance between the two end surface electrodes of the capacitor core 100), and the second transition portion 221 covers more than 2 / 3 of the height of the side surface 101 of the capacitor core 100. In this way, the heat can be better transferred to the heat sink 600 for cooling.

[0046] In addition, a first insulating sheet 701 is provided between the metal plate and the first overlapping portion 302, a second insulating sheet 702 is provided in the overlapping area between the second busbar 300 and the first busbar 200, and a third insulating sheet 703 is provided between the first transition portion 212 and the capacitor core 100. In this way, the insulation between the components of the capacitor can be ensured.

[0047] More specifically, the third insulating sheet 703 may extend toward the second bus bar 300 to be inserted into the through hole 305 of the second bus bar 300 .

[0048] When assembling the capacitor element assembly, the second busbar 300 overlaps the rear end face of the capacitor core 100 from the rear, and the first busbar 200 overlaps the front end face of the capacitor core 100 from the front. Each first electrode terminal portion 211 and each second electrode terminal portion 301 are brought into contact with the corresponding end face electrode 102, and then joined by a joining method such as brazing.

[0049] Thus, the first busbar 200 and the second busbar 300 are connected to the plurality of capacitor cores 100 and insulated by the insulating sheet in the overlapping area. In this way, the first busbar 200, the second busbar 300, the plurality of capacitor cores 100 and the insulating sheet are assembled into one piece to complete the capacitor element assembly.

[0050] like Figure 2 As shown, the capacitor element assembly is then received into the accommodating cavity 401 of the shell 400 from the front end, and then the filling resin 500 in liquid state is injected into the accommodating cavity 401 from the front end of the shell 400, so that the space between the capacitor element assembly and the shell 400 is filled with the filling resin 500; if the injection of the filling resin 500 is completed, the filling resin 500 in the shell 400 can be hardened, and the capacitor element assembly is fixed relative to the shell 400 by the hardened filling resin 500.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or several embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A capacitor, characterized in that: including a first busbar and a capacitor core; The first busbar comprises a first plate body and a second plate body, the first plate body comprising an electrode terminal portion connected to the capacitor core, and a first transition portion bent and extended from the electrode terminal portion toward a side surface of the capacitor core; the second plate body comprising a second transition portion overlapped and connected with the first transition portion, an inclined portion bent and obliquely extended from an overlapping end of the second transition portion, and a first connecting terminal portion bent and horizontally extended from an end portion of the inclined portion, the first connecting terminal portion being suitable for connection to an external terminal, and the inclined portion forming an acute angle with an electrode end surface of the capacitor core.

2. The capacitor according to claim 1, wherein: The inclined portion is bent and obliquely extends upward from the overlapping end of the second transition portion.

3. The capacitor according to claim 1, wherein: The inclined portion is inclined so as to be separated from the electrode terminal portion.

4. The capacitor according to claim 1, wherein The first transition portion is closely connected to the second transition portion.

5. The capacitor according to claim 1, wherein: comprising a second busbar and a shell; The second busbar is opposite to the first busbar and draws power from the capacitor core, and the second busbar has a first overlapping portion overlapping the second transition portion, a second overlapping portion overlapping the inclined portion, and a second connection terminal portion bent and horizontally extended from the second overlapping portion; The shell has a containing cavity for accommodating the capacitor core connected with the first busbar and the second busbar, and a heat sink is installed on one side of the shell where the first overlapping portion is located.

6. The capacitor according to claim 5, characterized in that The heat dissipation plate is a metal plate.

7. The capacitor according to claim 6, characterized in that A first insulating sheet is provided between the metal plate and the first overlapping portion, a second insulating sheet is provided in the overlapping area between the second busbar and the first busbar, and a third insulating sheet is provided between the first transition portion and the capacitor core.

8. The capacitor according to claim 1, wherein: The first transition portion extends to cover nearly half of the height of the side surface of the capacitor core, and the second transition portion covers more than 2 / 3 of the height of the side surface of the capacitor core.

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