Pre-charging device, battery pack circuit breaking unit and electric equipment

Abstract

The embodiment of the utility model provides a pre-charging device, a battery pack circuit breaking unit and electric equipment. The pre-charging device comprises a shell, a pre-charging resistor and a pre-charging relay, wherein the pre-charging resistor and the pre-charging relay are arranged in the shell; the shell comprises at least two high-voltage electrodes and at least two low-voltage electrodes, the first end of the pre-charging resistor is fixedly connected and conducted with the first high-voltage end of the pre-charging relay, the second end of the pre-charging resistor is fixedly connected and conducted with one high-voltage electrode, and the second high-voltage end of the pre-charging relay is fixedly connected and conducted with the other high-voltage electrode; and two low-voltage ends of the pre-charging relay are fixedly connected and conducted with the two low-voltage electrodes respectively. The pre-charging device is convenient to install, and the connection reliability is improved.

Description

Technical Field

[0001] This application relates to new energy, and more particularly to a pre-charging device, a battery pack circuit breaker unit, and electrical equipment. Background Technology

[0002] With the rapid development of economy and technology, the application of power batteries is becoming increasingly widespread. The Battery Distribution Unit (BDU), as a device for disconnecting and connecting high-voltage power to the power battery, plays a crucial role in the safety of the power battery. The BDU includes a pre-charge device, which comprises a housing, and a pre-charge relay and a pre-charge resistor housed within the housing, forming a modular unit for standardized design. However, the aforementioned pre-charge device is difficult to install and has low connection reliability. Utility Model Content

[0003] This application provides a pre-charging device, a battery pack circuit breaker unit, and an electrical device to reduce installation difficulty and improve connection reliability.

[0004] In a first aspect, embodiments of this application provide a pre-charging device, comprising: a housing, and a pre-charging resistor and a pre-charging relay disposed within the housing;

[0005] The housing includes at least two high-voltage electrodes and at least two low-voltage electrodes. The first end of the pre-charge resistor is fixedly connected to and conducts through the first high-voltage end of the pre-charge relay. The second end of the pre-charge resistor is fixedly connected to and conducts through one of the high-voltage electrodes. The second high-voltage end of the pre-charge relay is fixedly connected to and conducts through the other high-voltage electrode. The two low-voltage ends of the pre-charge relay are respectively fixedly connected to and conduct through the two low-voltage electrodes.

[0006] In one possible implementation, the first terminal of the pre-charge resistor is connected to the first high-voltage terminal of the pre-charge relay for conduction; and / or

[0007] The second end of the pre-charge resistor is welded to the corresponding high-voltage electrode for conduction; and / or

[0008] The second high-voltage terminal of the precharge relay is welded to the corresponding high-voltage electrode for conduction; and / or

[0009] The two low-voltage terminals of the precharge relay are respectively welded to the corresponding low-voltage electrodes for conduction.

[0010] In one possible implementation, the housing further includes:

[0011] A first housing, the first housing having a first receiving cavity and a first opening communicating with the first receiving cavity, wherein the at least two low-voltage electrodes are disposed in the first receiving cavity and the at least two low-voltage electrodes extend out of the first housing;

[0012] The second housing has a second receiving cavity and a second opening communicating with the second receiving cavity. The second opening is opposite to and communicates with the first opening. The at least two high-voltage electrodes are disposed in the second receiving cavity and extend out of the second housing.

[0013] In one possible implementation, the first housing is injection molded with the low-voltage electrode as a first insert.

[0014] And / or, the second housing is injection molded with the high-voltage electrode as a second insert.

[0015] In one possible implementation, the first housing further has a third opening that communicates with the first receiving cavity;

[0016] The low-voltage electrode includes a low-voltage electrode post and a first connecting piece disposed at one end of the low-voltage electrode post. The other end of the low-voltage electrode post extends out of the first housing. The first connecting piece is located in the first receiving cavity and exposed in the third opening.

[0017] The low-voltage terminal of the precharge relay is welded to the corresponding first connecting piece.

[0018] In one possible implementation, the first connecting piece exposed within the third opening is provided with a first through hole;

[0019] The low-voltage end of the precharge relay is a pin, which passes through the corresponding first through hole and is welded to the first connecting piece.

[0020] In one possible implementation, the second housing further has a fourth opening that communicates with the second receiving cavity;

[0021] The high-voltage electrode includes a high-voltage electrode post and a second connecting piece disposed at one end of the high-voltage electrode post. The other end of the high-voltage electrode post extends out of the second housing, and the second connecting piece is located in the second receiving cavity.

[0022] At least a portion of the second connecting piece is exposed within the fourth opening and is welded to the second end of the pre-charge resistor.

[0023] In one possible implementation, the housing further includes a seal disposed within the fourth opening for sealing the fourth opening.

[0024] In one possible implementation, the pre-charge resistor includes:

[0025] A first housing having a fifth opening, and the first housing forming the second end of the pre-charge resistor;

[0026] An insulating element that blocks the fifth opening;

[0027] A wire harness, one end of which passes through the insulator;

[0028] A flag-shaped terminal is located outside the first housing and connected to the wiring harness. The flag-shaped terminal forms the second end of the pre-charge resistor and is plugged into the first high-voltage terminal of the pre-charge relay.

[0029] In one possible implementation, the pre-charge device further includes an outlet and a third connecting piece disposed within the housing;

[0030] The high-voltage electrode corresponding to the second high-voltage terminal of the precharge relay is fixedly connected to and conducts through the lead-out bar. The second high-voltage terminal of the precharge relay is fixedly connected to and conducts through the third connecting piece.

[0031] In one possible implementation, the second high-voltage terminal of the precharge relay is provided with a second through hole, and the lead-out terminal is provided with a third through hole;

[0032] The two ends of the third connecting piece are located in the second through hole and the third through hole, respectively, and are welded to the second high-voltage terminal of the precharge relay and the lead-out busbar, respectively.

[0033] In one possible implementation, the pre-filling device further includes potting compound that fills the housing.

[0034] Secondly, embodiments of this application provide a battery pack circuit breaker unit, including the pre-charging device described above.

[0035] Thirdly, embodiments of this application provide an electrical device including a battery pack circuit breaker unit as described above.

[0036] The pre-charging device, battery pack circuit breaker unit, and electrical equipment provided in this application integrate a pre-charging resistor and a pre-charging relay within a housing. The first end of the pre-charging resistor is fixedly connected to and conducts through the first high-voltage end of the pre-charging relay, the second end of the pre-charging resistor is fixedly connected to and conducts through a high-voltage electrode, the second high-voltage end of the pre-charging relay is fixedly connected to and conducts through another high-voltage electrode, and the two low-voltage ends of the pre-charging relay are respectively fixedly connected to and conduct through two low-voltage electrodes. This facilitates installation and ensures a reliable connection. Attached Figure Description

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

[0038] Figure 1 A schematic diagram of the precharge circuit provided in this application;

[0039] Figure 2 A schematic diagram of the pre-charging device provided in this application;

[0040] Figure 3 Exploded view of the pre-charging device provided in this application;

[0041] Figure 4 A schematic diagram of the first housing and low-pressure electrode provided for this application;

[0042] Figure 5 A schematic diagram of the second housing and high-voltage electrode provided in this application;

[0043] Figure 6 A schematic diagram of the precharged relay provided in this application;

[0044] Figure 7 A schematic diagram of the pre-charge resistor provided in this application;

[0045] Figure 8 A schematic diagram of the third connecting piece provided in this application;

[0046] Figure 9 A schematic diagram of the seal provided in this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 10-Housing shell; 11-First housing shell; 12-Second housing shell; 13-Third opening; 14-Snap fastener; 15-Second opening; 16-Slot;

[0049] 20 - High voltage electrode;

[0050] 30 - Low-voltage electrode;

[0051] 40 - Pre-charge resistor; 41 - First housing; 42 - Insulator; 43 - Wiring harness; 44 - Flag terminal;

[0052] 50 - Precharged relay; 51 - Second housing; 52 - Pin; 53 - First high-voltage terminal; 54 - Second high-voltage terminal; 55 - Second through hole;

[0053] 60 - Seals;

[0054] 70 - Third connecting piece;

[0055] 80 - Outlet; 81 - Third through hole.

[0056] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0057] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0058] In existing technologies, pre-charge devices are difficult to install and have low connection reliability. This is because pre-charge relays are often connected via connectors and long wiring harnesses, while pre-charge resistors and pre-charge relays are often connected via lugs and bolts. Long wiring harnesses are difficult to install, and the flexible nature of the harnesses makes automated production of pre-charge devices challenging. Connector connections have high contact resistance at the connection points, making them prone to momentary disconnections during vibration. Bolted connections also have high contact resistance and are prone to loosening during vibration. Each component requires a separate installation location, increasing manufacturing complexity and cost, and hindering efficient space utilization and resulting in low integration.

[0059] The pre-charge device provided in this application integrates a pre-charge resistor and a pre-charge relay within a housing. The first end of the pre-charge resistor is fixedly connected to and conducts through the first high-voltage end of the pre-charge relay, the second end of the pre-charge resistor is fixedly connected to and conducts through a high-voltage electrode, the second high-voltage end of the pre-charge relay is fixedly connected to and conducts through another high-voltage electrode, and the two low-voltage ends of the pre-charge relay are respectively fixedly connected to and conduct through two low-voltage electrodes. This facilitates installation, enables automated production, and facilitates reliable connection.

[0060] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0061] This application provides an electrical device, which can be an electric vehicle, electric train, electric bicycle, golf cart, mobile phone, portable device, laptop computer, electric toy, power tool, ship, etc. The electric vehicle includes pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. The electrical device includes a battery pack circuit breaker unit and may also include a power battery. The power battery provides energy to the electrical device and is electrically connected to the battery pack circuit breaker unit. The battery pack circuit breaker unit controls or monitors the power battery's status to ensure its safety.

[0062] The battery pack circuit breaker unit includes a pre-charge device, which is used to prevent the large current generated in the capacitor circuit during high-voltage power-on from impacting and damaging other components. (See also...) Figures 1 to 9 The pre-charge device includes a housing 10, and a pre-charge resistor 40 and a pre-charge relay 50 disposed within the housing 10. By integrating the pre-charge resistor 40 and the pre-charge relay 50 into the housing 10 to form an integral module, the pre-charge device can achieve the following: Figure 1 The modular design of the pre-charge circuit shown can improve electrical integration, reduce production costs, and facilitate installation and maintenance.

[0063] The housing 10 includes at least two high-voltage electrodes 20 and at least two low-voltage electrodes 30. The first end of the pre-charge resistor 40 is fixedly connected to and conducts through the first high-voltage terminal 53 of the pre-charge relay 50. The second end of the pre-charge resistor 40 is fixedly connected to and conducts through one high-voltage electrode 20. The second high-voltage terminal 54 of the pre-charge relay 50 is fixedly connected to and conducts through the other high-voltage electrode 20. The two low-voltage terminals of the pre-charge relay 50 are respectively fixedly connected to and conduct through the two low-voltage electrodes 30. By fixing and conducting the pre-charge resistor 40, the pre-charge relay 50, and the corresponding high-voltage electrodes 20 and low-voltage electrodes 30, the entire pre-charge circuit is made conductive. Furthermore, compared to flexible wiring harness connections, this reduces installation difficulty and enables automated production.

[0064] Specifically, the first end of the precharge resistor 40 is connected to the first high-voltage terminal 53 of the precharge relay 50 by plugging or welding, the second end of the precharge resistor 40 is connected to the corresponding high-voltage electrode 20 by plugging or welding, the second high-voltage terminal 54 of the precharge relay 50 is connected to the corresponding high-voltage electrode 20 by plugging or welding, and the two low-voltage terminals of the precharge relay 50 are connected to the corresponding low-voltage electrodes 30 by plugging or welding.

[0065] More preferably, such as Figure 3As shown at point A, the pre-charge resistor 40 and the pre-charge relay 50 are connected by a plug-in connection. The pre-charge resistor 40 is soldered to the high-voltage electrode 20, and the pre-charge relay 50 is soldered to the high-voltage electrode 20. The low-voltage terminal of the pre-charge relay 50 is soldered to the low-voltage electrode 30. This allows for external soldering of the pre-charge resistor 40 and its corresponding high-voltage electrode 20, the pre-charge relay 50 and its corresponding high-voltage electrode 20, and the low-voltage terminal of the pre-charge relay 50 and its low-voltage electrode 30, providing ample operating space. The plug-in connection between the pre-charge resistor 40 and the pre-charge relay 50 facilitates installation.

[0066] The aforementioned plug-in connection refers to the plug-in connection between two corresponding structures, achieving an electrical connection after the plug-in connection. The aforementioned welding connection includes direct welding connection or indirect welding connection. Direct welding connection refers to the direct welding connection between two corresponding structures to achieve an electrical connection. For example, the second end of the pre-charge resistor 40 is in contact with or adjacent to the corresponding high-voltage electrode 20, and the two are welded together to fix them relatively and electrically connect them.

[0067] Indirect welding refers to the electrical connection between two corresponding structures achieved through welding to other structures, for example, see [reference needed]. Figure 3 , Figure 5 , Figure 7 and Figure 8 The low-voltage terminal of the precharge relay 50 is welded to the third connecting piece 70, the third connecting piece 70 is welded to the lead-out bar 80, and the lead-out bar 80 is welded to the corresponding low-voltage electrode 30 or is an integral structure.

[0068] In this way, the connections between the various parts of the pre-charging device eliminate bolt connections, connector connections, and long wire harness connections. Welding and plug-in processes are used to ensure circuit continuity, improving connection reliability. Meanwhile, the high-voltage electrode 20 and the low-voltage electrode 30 serve as external connection points for the high-voltage pre-charging current circuit and the low-voltage communication circuit, respectively, allowing for welding to external circuits without the need for bolt / clip mounting angles, thus facilitating installation.

[0069] See Figure 2 The housing 10 can be a cuboid, cube, cylinder, elliptical cylinder, etc., and its material includes plastic to ensure insulation. Two high-voltage electrodes 20 can be provided, for example, two electrodes can be provided. Each high-voltage electrode 20 forms the high-voltage input / output terminal of the pre-charge device, and its material includes metals and their compounds. Each high-voltage electrode 20 is partially located inside the housing 10 and partially extends outside the housing 10, so that the high-voltage electrode 20 is partially exposed for easy connection to external circuitry.

[0070] Two or more low-voltage electrodes 30 may be provided, for example, two electrodes may be provided. Each low-voltage electrode 30 forms a low-voltage control terminal of the pre-charge device, providing low-voltage control for the pre-charge relay 50. The material of the low-voltage electrodes 30 includes metals and their compounds. Each low-voltage electrode 30 is partially located inside the housing 10 and partially extends out of the housing 10, so that the low-voltage electrode 30 is partially exposed for easy connection to external circuitry.

[0071] The high-voltage electrode 20 and the low-voltage electrode 30 can be respectively disposed on two opposite surfaces of the housing 10 along a first direction, which can be the height direction of the housing 10. Figure 2 (Z direction shown). For example, the high-voltage electrode 20 is disposed on the bottom surface of the housing 10, and the low-voltage electrode 30 is disposed on the top surface of the housing 10. In this way, the high-voltage electrode 20 and the low-voltage electrode 30 are far apart, making it less likely to short-circuit and improving the reliability of the pre-charge device.

[0072] In some possible implementations, see [reference] Figures 2 to 5 The housing 10 includes a first housing 11 and a second housing 12. The first housing 11 has a first receiving cavity and a first opening communicating with the first receiving cavity. The second housing 12 has a second receiving cavity and a second opening 15 communicating with the second receiving cavity. The second opening 15 is opposite to and communicates with the first opening. In this way, the first receiving cavity and the second receiving cavity are connected to form a space for accommodating the pre-charge resistor 40 and the pre-charge relay 50, which facilitates the installation of the pre-charge resistor 40 and the pre-charge relay 50.

[0073] Furthermore, at least two low-voltage electrodes 30 are provided in the first receiving cavity, and at least two low-voltage electrodes 30 extend out of the first housing 11; at least two high-voltage electrodes 20 are provided in the second receiving cavity, and at least two high-voltage electrodes 20 extend out of the second housing 12, such that the high-voltage electrodes 20 and the low-voltage electrodes 30 are located in the second housing 12 and the first housing 11 respectively, so as to fix the high-voltage electrodes 20 and the low-voltage electrodes 30 respectively. The high-voltage electrodes 20 and the low-voltage electrodes 30 are independent of each other and are not easily short-circuited.

[0074] Specifically, the first housing 11 and the second housing 12 are detachably connected, such as... Figure 2 As shown, the first housing 11 and the second housing 12 are snapped together. One of the first housing 11 and the second housing 12 is provided with a buckle 14, and the other is provided with a slot 16. For example, as shown... Figure 4 and Figure 5 As shown, the first housing 11 is provided with a buckle 14, and the second housing 12 is provided with a slot 16. Multiple buckles 14 and slots 16 can be provided and adapted to each other.

[0075] The first housing 11 and the second housing 12 are along the first direction ( Figure 2As shown in the Z direction, the first opening and the second opening 15 are positioned opposite each other, with the first housing 11 located on top of the second housing 12. The first housing 11 is the upper housing, and the second housing 12 is the lower housing. The first opening is located at the bottom of the first housing 11, and the second opening 15 is located at the top of the second housing 12.

[0076] The first housing 11 and the second housing 12 can both be cylindrical and have compatible shapes, for example, both being rectangular cylinders. The low-voltage electrode 30 is opposite to the first opening, for example, located on the side of the first housing 11 away from the first opening, i.e., at the top of the first housing 11. The high-voltage electrode 20 is opposite to the second opening 15, for example, located on the side of the second housing 12 away from the second opening 15, i.e., at the bottom of the second housing 12.

[0077] The first housing 11 is injection molded, and during the injection molding process, a low-voltage electrode 30 is used as the first insert. That is, the first housing 11 and the low-voltage electrode 30 are manufactured using an insert injection molding process, so that the first housing 11 and the low-voltage electrode 30 are integrated and do not require further fixing, and the internal stress of the low-voltage electrode 30 is relatively small. The second housing 12 is injection molded, and during the injection molding process, a high-voltage electrode 20 is used as the second insert. That is, the second housing 12 and the high-voltage electrode 20 are manufactured using an insert injection molding process, so that the second housing 12 and the high-voltage electrode 20 are integrated and do not require further fixing, and the internal stress of the high-voltage electrode 20 is relatively small.

[0078] In some possible implementations, see [reference] Figure 4 The first housing 11 also has a third opening 13, which communicates with the first receiving cavity. For example, the third opening 13 is opposite to the first opening, and may be located on the top surface of the first housing 11. The third opening 13 exposes a portion of the low-voltage electrode 30 to facilitate welding between the low-voltage electrode 30 and the pre-charge relay 50. The third opening 13 also serves as a potting port to allow potting compound to be injected into the first housing 11, thereby securing and damping the pre-charge resistor 40 and the pre-charge relay 50 within the first housing 11.

[0079] See Figure 5 The second housing 12 also has a fourth opening that communicates with the second receiving cavity. Exemplarily, the fourth opening is opposite to the second opening 15, for example, the fourth opening is located on the bottom surface of the second housing 12. The fourth opening exposes at least a portion of the high-voltage electrode 20 connected to the pre-charge resistor 40 to enable welding of the pre-charge resistor 40 to the corresponding high-voltage electrode 20.

[0080] See Figure 4 and Figure 9The housing 10 also includes a seal 60 disposed within the fourth opening to seal it. This prevents potting compound from leaking from the fourth opening, thus securing the precharge resistor 40 and the precharge relay 50 within the second housing 12. For example, the seal 60 may be a rubber plug, interference-fitted into the fourth opening.

[0081] In some possible examples, there are two low-voltage electrodes 30, arranged at intervals. Each low-voltage electrode 30 includes a low-voltage terminal and a first connecting piece, which is disposed at one end of the low-voltage terminal. For example, the first connecting piece and the low-voltage terminal may be an integral structure or welded together. One end of the low-voltage terminal is located in the first receiving cavity of the first housing 11, and the other end extends out of the first housing 11. The low-voltage terminal may be a square terminal.

[0082] The first connecting piece is located in the first receiving cavity and exposed in the third opening 13 of the first housing 11. For example, the ends of the two first connecting pieces that are adjacent to each other are exposed in the third opening 13, and the ends of the two first connecting pieces that are far apart from each other are respectively provided with corresponding low-voltage terminals, so that the two low-voltage terminals are far apart from each other and avoid short-circuiting between them.

[0083] The first connecting piece contacts and is fixedly connected to the low-voltage end corresponding to the pre-charge relay 50. The first connecting piece can be a rectangular long piece, which serves as the lateral extension end of the low-voltage pole, allowing the low-voltage pole to be offset from the corresponding end of the pre-charge relay 50 and to conduct electricity, facilitating the external connection of the low-voltage electrode 30, and enabling the welding of the low-voltage electrode 30 and the pre-charge relay 50 to the outside of the housing 10.

[0084] See also some possible implementations. Figure 6 The first connecting piece exposed within the third opening 13 has a first through hole; the low-voltage end of the pre-charge relay 50 is a pin 52, which passes through the corresponding first through hole and is soldered to the first connecting piece. Both the pin 52 and the first through hole are exposed within the third opening 13. When the pin 52 is installed into the first through hole, the pin 52 and the first connecting piece are soldered to achieve relative fixation and electrical conduction between the pin 52 and the first connecting piece.

[0085] In some possible examples, the precharge relay 50 includes a second housing 51, which is insulated and houses corresponding components. A pin 52 connects to the corresponding components within the second housing 51 and extends out of the second housing 51. For example, the pin 52 extends out of the top of the second housing 51 toward the first connecting piece for easy mating with it.

[0086] The first high-voltage terminal 53 of the precharge relay 50 is connected to the corresponding component inside the second housing 51 and extends out of the second housing 51. For example, the first high-voltage terminal 53 of the precharge relay 50 is located on the same side as the pin 52. The first high-voltage terminal 53 is a plug-in interface for the first end of the precharge resistor 40 to be inserted and abutted, so that the precharge relay 50, the first high-voltage terminal 53, and the first end of the precharge resistor 40 are relatively fixed and connected.

[0087] For example, see Figure 7 The first end of the pre-charge resistor 40 is a flag-shaped terminal 44. The first high-voltage terminal 53 of the pre-charge relay 50 includes a U-shaped plug and a tab disposed at the opening of the U-shaped plug. The U-shaped plug and the tab extend in the same direction. One end of the U-shaped plug and the tab forms a connector for the flag-shaped terminal 44 to enter. The flag-shaped terminal 44 is inserted between the U-shaped plug and the tab, and abuts against both the U-shaped plug and the tab.

[0088] In some possible examples, there are two high-voltage electrodes 20, arranged at intervals. At least one high-voltage electrode 20 includes a high-voltage terminal and a second connecting piece, the second connecting piece being disposed at one end of the high-voltage terminal, for example, the second connecting piece and the high-voltage terminal are an integral structure or welded together. One end of the high-voltage terminal is located in the second receiving cavity of the second housing 12, and the other end extends out of the second housing 12. The high-voltage terminal can be a square or round terminal, and the first connecting piece can be a rectangular elongated piece.

[0089] At least one second connecting piece corresponding to the second end of the pre-charge resistor 40 is exposed within the fourth opening to facilitate welding to the second end of the pre-charge resistor 40. Specifically, at least one second connecting piece is exposed within the fourth opening to be connected to the second end of the pre-charge resistor 40. The second end of the pre-charge resistor 40 is connected to the corresponding second connecting piece; for example, the second end of the pre-charge resistor 40 is located on and welded to the corresponding second connecting piece.

[0090] The high-voltage electrode 20 corresponding to the second high-voltage terminal 54 of the pre-charge relay 50 may also include a high-voltage post and a second connecting piece, which may or may not be exposed within the fourth opening. Figure 3 , Figure 5 and Figure 6 As shown, the second connecting piece is connected to the second high-voltage terminal 54 of the precharge relay 50 via the lead-out bar 80 and the third connecting piece 70, so as to realize the connection between the high-voltage electrode 20 and the second high-voltage terminal 54 of the precharge relay 50 extending out of the second opening 15.

[0091] In some possible implementations, the precharge device also includes a lead-out bar 80 and a third connecting piece 70 disposed within the housing 10; the high-voltage electrode 20, which corresponds to the second high-voltage terminal 54 of the precharge relay 50, is fixedly connected to and conducts through the lead-out bar 80, and the second high-voltage terminal 54 of the precharge relay 50 is fixedly connected to and conducts through the third connecting piece 70.

[0092] The lead-out bar 80 serves as an extension of the high-voltage electrode 20, allowing connection between the high-voltage electrode 20 and the second high-voltage terminal 54 of the pre-charge relay 50, which are located far apart. The lead-out bar 80 also possesses a certain rigidity, making it resistant to deformation and facilitating connection. The third connecting piece 70 allows for the spacing between the lead-out bar 80 and the second high-voltage terminal 54 of the pre-charge relay 50, facilitating the installation of the pre-charge relay 50 within the second housing 12.

[0093] The second high-voltage terminal 54 can have the same structure as the first high-voltage terminal 53, meaning the second high-voltage terminal 54 also includes a U-shaped connector and a connector plate. The lead-out bus 80 can be a copper bus or an aluminum bus. The lead-out bus 80 is welded to the second connecting piece of the high-voltage electrode 20 or is an integral structure. For example, the lead-out bus 80 and the second connecting piece are L-shaped as a whole, with one bent end abutting against the high-voltage electrode post and the other bent end welded to the third connecting piece 70.

[0094] For example, see Figure 5 , Figure 6 and Figure 8 The second high-voltage terminal 54 (e.g., a insert) of the precharge relay 50 is provided with a second through hole 55, and the lead-out bar 80 is provided with a third through hole 81; the two ends of the third connecting piece 70 are located in the second through hole 55 and the third through hole 81, respectively, and are welded to the second high-voltage terminal 54 and the lead-out bar 80 of the precharge relay 50, respectively. Alternatively, the second high-voltage terminal 54 of the precharge relay 50 and the lead-out bar 80 are arranged side-by-side, and the third connecting piece 70 overlaps the second high-voltage terminal 54 and the lead-out bar 80 of the precharge relay 50, and is welded to the second high-voltage terminal 54 and the lead-out bar 80 of the precharge relay 50, respectively.

[0095] like Figure 6 and Figure 8 As shown, the third connecting piece 70 can be elongated, cross-shaped, etc. The second high-voltage terminal 54 of the precharge relay 50 can extend out of the second housing 51 of the precharge relay 50 and be disposed on the same side as the first high-voltage terminal 53 and the low-voltage terminal of the precharge relay 50. This embodiment of the application is not limited in this respect.

[0096] Continue reading Figure 3 The pre-charge resistor 40 and the pre-charge relay 50 are arranged side by side in the housing 10. For example, the pre-charge resistor 40 and the pre-charge relay 50 are arranged along a second direction, which is perpendicular to the first direction. The second direction can be the width direction or the thickness direction of the pre-charge device.

[0097] See Figure 3 and Figure 7 The pre-charge resistor 40 includes a first housing 41, an insulating element 42, a wiring harness 43, and a flag-shaped terminal 44. The first housing 41 has a fifth opening and forms the second end of the pre-charge resistor 40, meaning the first housing 41 is conductive and contacts the corresponding high-voltage electrode 20. The first housing 41 can be cuboid, cube, etc. The fifth opening faces the pre-charge relay 50 to facilitate connection between the pre-charge resistor 40 and the pre-charge relay 50.

[0098] Insulator 42 seals the fifth opening. One end of wire harness 43 passes through insulator 42 to space it from the first housing 41, preventing a short circuit. One end of wire harness 43 extending beyond insulator 42 connects to flag terminal 44, for example, by crimping. Flag terminal 44 is located outside the first housing 41, forming the second end of precharge resistor 40, which is plugged into the first high-voltage terminal 53 of precharge relay 50.

[0099] Thus, the first housing 41 of the precharge resistor 40 is connected to a high-voltage electrode 20, for example, by welding; the flag-shaped terminal 44 of the precharge resistor 40 is connected to the first high-voltage terminal 53 of the precharge relay 50, for example, by plugging; the second high-voltage terminal 54 of the precharge relay 50 is connected to another high-voltage electrode 20, for example, by welding through a third connecting piece 70; the two low-voltage terminals of the precharge relay 50 are respectively connected to two low-voltage electrodes 30, for example, by welding, so that the precharge circuit in the precharge device is connected, and the connection to the external circuit is realized through the two high-voltage electrodes 20 and the two low-voltage electrodes 30.

[0100] In some possible embodiments, the pre-charge device also includes a potting compound that fills the housing 10 to secure the pre-charge resistor 40 and the pre-charge relay 50, and to improve their resistance to mechanical shock and vibration. The potting compound also fills the third opening 13, ensuring the housing 10 is completely filled and preventing impurities such as moisture from entering the housing 10 through the third opening 13. The potting compound may be made of polyurethane, silicone, epoxy resin, etc.

[0101] The installation process of the pre-charging device in this embodiment is as follows:

[0102] The pre-charge resistor 40 and the pre-charge relay 50 are fixed inside the second housing 12. At the same time, the first end of the pre-charge resistor 40 is connected to the first high-voltage terminal 53 of the pre-charge relay 50, and the second end of the pre-charge resistor 40 is in contact with a high-voltage electrode 20 of the second housing 12.

[0103] The second end of the pre-charge resistor 40 is welded to the corresponding high-voltage electrode 20 through the fourth opening. After sealing the fourth opening with the sealing member 60, glue is poured into the second housing 12.

[0104] The second high-voltage terminal 54 of the precharge relay 50 is welded to the lead-out bar 80 via the third connecting piece 70 using the third opening 13, wherein the lead-out bar 80 is connected to another high-voltage electrode 20;

[0105] Continue applying adhesive through the third opening 13 to complete the installation of the entire pre-filling device.

[0106] The pre-charge device in this embodiment includes a housing 10, and a pre-charge resistor 40 and a pre-charge relay 50 disposed within the housing 10. The housing 10 includes at least two high-voltage electrodes 20 and at least two low-voltage electrodes 30. The first end of the pre-charge resistor 40 is fixedly connected to and conducts through the first high-voltage terminal 53 of the pre-charge relay 50. The second end of the pre-charge resistor 40 is fixedly connected to and conducts through one high-voltage electrode 20. The second high-voltage terminal 54 of the pre-charge relay 50 is fixedly connected to and conducts through the other high-voltage electrode 20. The two low-voltage terminals of the pre-charge relay 50 are respectively fixedly connected to and conduct through the two low-voltage electrodes 30. The pre-charge resistor 40 and the pre-charge relay 50 are integrated within the housing 10, improving the integration of the pre-charge device. The fixed connection and conduction between the pre-charge resistor 40, the pre-charge relay 50, the high-voltage electrodes 20, and the low-voltage electrodes 30 facilitates installation, enables automated production, and improves connection reliability.

[0107] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A pre-charging device, characterized in that, include: The housing (10), and the pre-charge resistor (40) and pre-charge relay (50) disposed within the housing (10); The housing (10) includes at least two high-voltage electrodes (20) and at least two low-voltage electrodes (30). The first end of the pre-charge resistor (40) is fixedly connected to and conducts through the first high-voltage terminal (53) of the pre-charge relay (50). The second end of the pre-charge resistor (40) is fixedly connected to and conducts through one of the high-voltage electrodes (20). The second high-voltage terminal (54) of the precharge relay (50) is fixedly connected to and conducts through another high-voltage electrode (20), and the two low-voltage terminals of the precharge relay (50) are fixedly connected to and conduct through two low-voltage electrodes (30) respectively.

2. The pre-charging device according to claim 1, characterized in that, The first terminal of the pre-charge resistor (40) is connected to the first high-voltage terminal (53) of the pre-charge relay (50); and / or The second end of the pre-charge resistor (40) is welded to the corresponding high-voltage electrode (20) for conduction; and / or The second high-voltage terminal (54) of the precharge relay (50) is welded and connected to the corresponding high-voltage electrode (20); and / or The two low-voltage terminals of the precharge relay (50) are respectively welded to the corresponding low-voltage electrodes (30) for conduction.

3. The pre-charging device according to claim 1, characterized in that, The housing (10) further includes: The first housing (11) has a first receiving cavity and a first opening communicating with the first receiving cavity. The first receiving cavity is provided with the at least two low-voltage electrodes (30), and the at least two low-voltage electrodes (30) extend out of the first housing (11). The second housing (12) has a second receiving cavity and a second opening (15) communicating with the second receiving cavity. The second opening (15) is opposite to and communicates with the first opening. The second receiving cavity is provided with the at least two high-voltage electrodes (20), and the at least two high-voltage electrodes (20) extend out of the second housing (12).

4. The pre-charging device according to claim 3, characterized in that, The first housing (11) is injection molded with the low-voltage electrode (30) as the first insert; And / or, the second housing (12) is injection molded with the high voltage electrode (20) as a second insert.

5. The pre-charging device according to claim 3, characterized in that, The first housing (11) also has a third opening (13) that communicates with the first receiving cavity; The low-pressure electrode (30) includes a low-pressure electrode post and a first connecting piece disposed at one end of the low-pressure electrode post. The other end of the low-pressure electrode post extends out of the first housing (11). The first connecting piece is located in the first receiving cavity and exposed in the third opening (13). The low-voltage end of the precharge relay (50) is welded to the corresponding first connecting piece.

6. The pre-charging device according to claim 5, characterized in that, The first connecting piece exposed in the third opening (13) is provided with a first through hole; The low-voltage end of the precharge relay (50) is a pin (52), which passes through the corresponding first through hole and is welded to the first connecting piece.

7. The pre-charging device according to claim 3, characterized in that, The second housing (12) also has a fourth opening, which communicates with the second receiving cavity; The high-voltage electrode (20) includes a high-voltage electrode post and a second connecting piece disposed at one end of the high-voltage electrode post. The other end of the high-voltage electrode post extends out of the second housing (12), and the second connecting piece is located in the second receiving cavity. At least a portion of the second connecting piece is exposed within the fourth opening and is welded to the second end of the pre-charge resistor (40).

8. The pre-charging device according to claim 7, characterized in that, The housing (10) also includes a seal (60) disposed within the fourth opening for sealing the fourth opening.

9. The pre-charging device according to any one of claims 1-8, characterized in that, The pre-charge resistor (40) includes: A first housing (41) having a fifth opening and forming the second end of the pre-charge resistor (40); Insulating element (42), the insulating element (42) sealing the fifth opening; A wire harness (43), one end of which passes through the insulator (42); Flag-shaped terminal (44) is located outside the first housing (41) and connected to the wiring harness (43). The flag-shaped terminal (44) forms the second end of the precharge resistor (40) and is plugged into the first high-voltage terminal (53) of the precharge relay (50).

10. The pre-charging device according to any one of claims 1-8, characterized in that, The pre-charge device also includes an outlet (80) and a third connecting piece (70) disposed within the housing (10). The high-voltage electrode (20) corresponding to the second high-voltage terminal (54) of the precharge relay (50) is fixedly connected to and conducts through the lead-out bar (80). The second high-voltage terminal (54) of the precharge relay (50) is fixedly connected to and conducts through the third connecting piece (70) to the lead-out bar (80).

11. The pre-charge device according to claim 10, characterized in that, The second high-voltage terminal (54) of the precharge relay (50) is provided with a second through hole (55), and the lead-out terminal (80) is provided with a third through hole (81). The two ends of the third connecting piece (70) are located in the second through hole (55) and the third through hole (81) respectively, and are welded to the second high voltage terminal (54) of the precharge relay (50) and the lead-out bar (80) respectively.

12. The pre-charging device according to any one of claims 1-8, characterized in that, The pre-filling device also includes potting compound, which fills the housing (10).

13. A battery pack circuit breaker unit, characterized in that, Includes the pre-charge device as described in any one of claims 1-12.

14. An electrical appliance, characterized in that, Includes the battery pack circuit breaker unit as described in claim 13.

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