CN221562812U - Battery pack breaking unit with horizontally-installed relay - Google Patents

Abstract

The utility model discloses a battery pack circuit breaker unit with a horizontally installed relay, wherein the main relay is a relay core without a housing; the relay core is an integral structure assembled by a contact part and a magnetic circuit part in a distribution manner in which the contact part is on the upper side and the magnetic circuit part is on the lower side; the main relay is installed in the housing in a horizontal manner, so that the contact part of the relay core faces the side of the housing; the side of the housing is also integrated with a 2-core high-voltage plug-in and connected to the contact part of the relay core through a copper busbar; the high-voltage sampling circuit and the low-voltage control circuit both use a small copper busbar, which is integrated on the housing. The utility model has low cost and good heat dissipation performance, and eliminates the transfer copper busbar and locking bolts between the battery pack circuit breaker unit and the 2-core high-voltage plug-in, which can reduce costs and reduce the temperature rise pressure of the battery pack circuit breaker unit. At the same time, the wireless bundle design is adopted to realize automatic assembly and improve production efficiency.

Description

Battery pack disconnect unit with horizontal relay installation

Technical Field

The utility model relates to the technical field of relays, in particular to a battery pack disconnecting unit with a horizontally installed relay.

Background Art

BDU (Battery Disconnect Unit) is a battery pack disconnect unit designed for the battery pack and is also a type of distribution box. As a battery module for protecting the battery box of an electric vehicle, BDU is a safety solution for lithium batteries in electric vehicles. It is an important protection module for the high-voltage circuit system of electric vehicles and an important part of the vehicle control system of electric vehicles. Its role is to coordinate the function conversion and energy distribution of high-voltage accessories such as the drive motor control system, battery management system, charging management system, DC/DC, electric air conditioning, electric power steering, and braking system. In the existing battery pack disconnect unit, the relay is usually set with a shell. Installing it in the battery pack disconnect unit is not only large in size and occupies a large space, but also requires glue dispensing technology and has high manufacturing costs. The 2-core high-voltage plug-in is usually installed on the aluminum shell plate of the battery pack, and a transfer copper busbar is required to connect the BDU. At this time, the transfer copper busbar and locking bolts between the BDU and the 2-core high-voltage plug-in will increase the cost, and the transfer copper busbar and locking point will increase the internal resistance of the circuit. When the BDU is working, the heat generated at this position is high, thereby increasing the temperature rise pressure of the BDU and the battery pack.

Utility Model Content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a battery pack circuit breaker unit with a horizontally installed relay, which has low cost and good heat dissipation performance, and eliminates the transfer copper bus and locking bolts between the battery pack circuit breaker unit and the 2-core high-voltage plug-in, thereby reducing costs and reducing the temperature rise pressure of the battery pack circuit breaker unit. At the same time, the wireless bundle design is adopted to realize automated assembly and improve production efficiency.

The technical solution adopted by the utility model to solve its technical problems is: a battery pack circuit breaker unit with a horizontally installed relay, comprising a shell, electronic devices installed in the shell, and a high-voltage sampling circuit and a low-voltage control circuit connected to the corresponding electronic devices, wherein the electronic devices include a main relay; the main relay is a relay core without a shell; the relay core is an integral structure assembled together by a contact part and a magnetic circuit part in a distribution manner in which the contact part is on the top and the magnetic circuit part is on the bottom; the main relay is installed in the shell in a horizontal manner, so that the contact part of the relay core faces the side of the shell; the side of the shell is also integrated with a 2-core high-voltage plug-in and the contact part of the relay core is connected through a copper busbar; the high-voltage sampling circuit and the low-voltage control circuit both use a small copper busbar, and the small copper busbar is integrated on the shell.

The shell includes an upper cover and a box body, and the box body is provided with a receiving groove opening upward; the relay core is adapted to be sideways in the receiving groove of the box body and fixed to the box body; the contact part of the head of the relay core is provided with two static contact terminals protruding outward, and the static contact terminals are fixedly connected to the copper busbar by bolts to realize the connection between the relay and the high-voltage circuit.

The small copper busbars of the high-voltage sampling circuit and the low-voltage control circuit are integrated into the upper cover and the box body by injection molding. A plug-in terminal is also provided at the connection point of the high-voltage sampling circuit and the low-voltage control circuit, and the plug-in terminal is connected to the corresponding small copper busbar.

The electronic device also includes a pre-charging relay, a pre-charging resistor, a fuse and a shunt; the pre-charging relay, the pre-charging resistor, the fuse and the shunt are respectively installed in the box body; the main circuit copper busbar used to connect the electronic devices is distributed on the side of the box body.

The main relay comprises a main positive relay and a main negative relay, and a copper busbar connected to one contact of each of the main positive relay and the main negative relay is connected from a side of the box body to a 2-core high-voltage plug-in on the same side.

The 2-core high-voltage plug-in is fixed on the side of the box body.

Heat-conducting pads are also provided at some positions of the main copper return busbar to reduce the temperature rise of the product.

The side of the box body is also provided with a thermally conductive ceramic sheet for heat dissipation, the thermally conductive ceramic sheet is closely attached to the inner side of the side wall of the box body, and the thermally conductive pad is sandwiched between the thermally conductive ceramic sheet and the main circuit copper busbar; a thermally conductive pad is also provided at a corresponding position on the outer side wall of the box body.

The small copper busbar of the high-pressure sampling circuit is integrated into the upper cover by injection molding, and the small copper busbar of the low-pressure control circuit is integrated into the box body by injection molding; the high-pressure sampling circuit and the low-pressure control circuit are both located in the top area of the shell, and the main circuit copper busbar is located in the middle position of the box body.

Compared with the prior art, the beneficial effects of the utility model are:

1. The utility model adopts the main relay as a relay core without a housing; the relay core is an integral structure assembled by the contact part and the magnetic circuit part in a distribution mode in which the contact part is on the top and the magnetic circuit part is on the bottom; the main relay is installed in the housing in a horizontal manner, so that the contact part of the relay core faces the side of the housing; the side of the housing is also integrated with a 2-core high-voltage plug-in and connected to the contact part of the relay core through a copper bar; the high-voltage sampling circuit and the low-voltage control circuit both use a small copper bar, which is integrated on the housing. This structure of the utility model removes the housing of the relay, reduces the use of parts, reduces the weight and cost of the relay, and can help the relay dissipate heat better. The utility model also cancels the transfer copper bar and locking bolt between the battery pack circuit breaker unit and the 2-core high-voltage plug-in, further reducing the cost. Due to the reduction of the transfer copper bar and the locking point, the internal resistance of the circuit becomes smaller. When the battery pack circuit breaker unit is working, the heat generated at this position will be reduced, thereby reducing the temperature rise pressure of the battery pack circuit breaker unit and the battery pack. At the same time, the wireless beam design can realize automated assembly and improve production efficiency.

2. The utility model adopts the shell including the upper cover and the box body, and the box body is provided with a receiving groove opening upward; the relay core is fitted in the receiving groove of the box body in a side-lying manner and fixed to the box body. This structure of the utility model makes the box body act as the outer shell of the relay core, which can protect the safety of the parts of the shell-less relay and avoid the relay function failure when the battery pack circuit breaker unit is subjected to vibration impact.

2. The utility model adopts the small copper bars of the high-voltage sampling circuit and the low-voltage control circuit to be integrated in the upper cover and the box body by injection molding, and a plug-in terminal is also provided at the connection point of the high-voltage sampling circuit and the low-voltage control circuit, and the plug-in terminal is connected to the corresponding small copper bar. This structure of the utility model realizes the design of eliminating wiring harnesses, making the overall assembly of the battery pack disconnecting unit simpler, thereby realizing automatic assembly and making production efficiency higher.

3. The utility model adopts thermal pads at some positions of the main copper busbar to reduce the temperature rise of the product. The side of the box body is also provided with a thermally conductive ceramic sheet for heat dissipation. The thermally conductive ceramic sheet is tightly attached to the inner side of the side wall of the box body, and the thermally conductive pad is sandwiched between the thermally conductive ceramic sheet and the main circuit copper busbar. A thermally conductive pad is also provided at a corresponding position on the outer side of the side wall of the box body. This structure of the utility model directly conducts the heat on the main circuit copper busbar to the outside of the battery pack circuit breaker unit, which helps the battery pack circuit breaker unit to dissipate heat, and the thermally conductive ceramic sheet is insulating, which can prevent the current on the main circuit copper busbar from escaping to the outside of the battery pack circuit breaker unit, causing the risk of electric shock to personnel.

4. The utility model adopts the small copper bar of the high-voltage sampling circuit to be integrated into the upper cover by injection molding, and the small copper bar of the low-voltage control circuit to be integrated into the box body by injection molding. This structure of the utility model enables the high-voltage sampling circuit and the low-voltage control circuit to be separated and not interfere with each other, thus ensuring the circuit safety.

The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the battery pack circuit breaker unit with a horizontally installed relay of the present invention is not limited to the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is an exploded schematic diagram of the utility model;

FIG2 is a schematic diagram of a three-dimensional structure of the utility model;

FIG3 is a schematic cross-sectional view of the upper cover of the present utility model;

FIG4 is an enlarged schematic diagram of point A in FIG3 ;

FIG5 is a top view of the high voltage sampling circuit of the utility model;

FIG6 is a schematic cross-sectional view of a box body of the present utility model;

FIG7 is an enlarged schematic diagram of point B in FIG6;

FIG8 is a top view of the low-voltage control circuit of the present utility model;

FIG9 is a schematic cross-sectional view of the utility model;

FIG. 10 is an enlarged schematic diagram of point C in FIG. 9 .

DETAILED DESCRIPTION

Example

Referring to FIGS. 1 to 10 , a battery pack circuit breaker unit with a horizontally mounted relay of the utility model comprises a housing 4, electronic devices mounted in the housing 4, and a high-voltage sampling circuit 6 and a low-voltage control circuit 7 connected to the corresponding electronic devices, wherein the electronic devices comprise a main relay; the main relay is a relay core without a housing; the relay core is an integral structure assembled together by a contact part and a magnetic circuit part in a distribution manner in which the contact part is on the upper side and the magnetic circuit part is on the lower side, and the main relay is mounted in the housing 4 in a horizontal manner so that the contact part of the relay core faces the side of the housing, specifically The main relay includes a main positive relay 2 and a main negative relay 3, and the main positive relay 2 and the main negative relay 3 are respectively relay cores without a housing. The main positive relay 2 is assembled from a contact part 21 and a magnetic circuit part 22, and the main negative relay 3 is assembled from a contact part 31 and a magnetic circuit part 32; the side of the shell 4 is also integrated with a 2-core high-voltage plug-in 1 and the contact part 21 of the main negative relay 2 and the contact part 31 of the main negative relay 3 are connected through a copper bus 5; the high-voltage sampling circuit 6 and the low-voltage control circuit 7 both use small copper buses, and the small copper buses are integrated on the shell 4.

The housing 4 includes an upper cover 41 and a box body 42, wherein the box body 42 is provided with a receiving groove 421 opening upward; the relay core is fitted in the receiving groove 421 of the box body 42 in a side-lying manner and fixed to the box body 42; the contact portion of the head of the relay core is provided with two static contact terminals protruding outward, and the static contact terminals are fixedly connected to the copper busbar by bolts to achieve the connection between the relay and the high-voltage circuit. Specifically, the contact portion 21 of the main positive relay 2 is provided with two static contact terminals 211 protruding outward, and the contact portion 31 of the main negative relay 3 is provided with two static contact terminals 311 protruding outward, and the static contact terminals 211, 311 are fixedly connected to the copper busbar 5 by bolts 8 to achieve the connection between the relay and the high-voltage circuit.

The small copper busbars of the high-voltage sampling circuit 6 and the low-voltage control circuit 7 are integrated into the upper cover 41 and the box body 42 by injection molding. A plug-in terminal 16 is also provided at the connection point of the high-voltage sampling circuit 6 and the low-voltage control circuit 7, and the plug-in terminal 16 is connected to the corresponding small copper busbar.

The electronic device also includes a pre-charge relay 9, a pre-charge resistor 10, a fuse 1 and a shunt 12; the pre-charge relay 9, the pre-charge resistor 10, the fuse 11 and the shunt 12 are respectively installed in the box body 42; the main circuit copper bus 5 for connecting the electronic devices is distributed on the side of the box body 42.

The copper busbar 5 connected to each contact of the main positive relay 2 and the main negative relay 3 is connected to the 2-core high-voltage plug-in 1 on the same side from the side of the box body.

The two-core high-voltage plug-in 1 is fixed on the side of the box body 42 .

A thermal pad 13 is also provided at some positions of the main return copper bar to reduce the temperature rise of the product. A thermally conductive ceramic sheet 14 for heat dissipation is also provided on the side of the box body 42. The thermally conductive ceramic sheet 14 is tightly attached to the inner side of the side wall of the box body 42, and the thermally conductive pad 13 is sandwiched between the thermally conductive ceramic sheet 14 and the main return copper bar 5; a thermally conductive pad 13 is also provided at a corresponding position on the outer side wall of the box body 42. A cooling component such as a water cooling plate can also be placed at the bottom of the box body 42 to further reduce the temperature of the battery pack circuit breaker unit and ensure the safety of the battery pack circuit breaker unit.

The small copper busbar of the high-pressure sampling circuit 6 is integrated into the upper cover 41 by injection molding, and the small copper busbar of the low-pressure control circuit 7 is integrated into the box body 42 by injection molding; the high-pressure sampling circuit 6 and the low-pressure control circuit 7 are both located in the top area of the shell, and the main circuit copper busbar 5 is located in the middle position of the box body 42.

The utility model discloses a battery pack circuit breaker unit with a horizontally installed relay, wherein the main relay is a relay core without a housing; the relay core is an integral structure assembled by a contact part and a magnetic circuit part in a distribution manner in which the contact part is on the top and the magnetic circuit part is on the bottom; the main relay is installed in the housing 4 in a horizontal manner, so that the contact part of the relay core faces the side of the housing 4; the side of the housing 4 is also integrated with a 2-core high-voltage plug-in 1 and connected to the contact part of the relay core through a copper bar 5; the high-voltage sampling circuit 6 and the low-voltage control circuit 7 both use a small copper bar, which is integrated on the housing. This structure of the utility model removes the housing of the relay, reduces the use of parts, reduces the weight and cost of the relay, and can help the relay to dissipate heat better. The utility model also eliminates the transfer copper bar and locking bolts between the battery pack circuit breaker unit and the 2-core high-voltage plug-in, further reducing costs. Due to the reduction of transfer copper bars and locking points, the internal resistance of the circuit becomes smaller. When the battery pack circuit breaker unit is working, the heat generated at this position will be reduced, thereby reducing the temperature rise pressure of the battery pack circuit breaker unit and the battery pack. At the same time, the wireless bundle design can realize automated assembly and improve production efficiency.

The utility model discloses a battery pack circuit breaker unit with a horizontally mounted relay, wherein the housing 4 includes an upper cover 41 and a box body 42, wherein the box body 42 is provided with a receiving groove 421 opening upward; the relay core is fitted in the receiving groove 421 of the box body 42 in a side-lying manner and is fixed to the box body 42. This structure of the utility model enables the box body to serve as the outer shell of the relay core, thereby protecting the safety of the parts of the shell-less relay and preventing the relay function from failing when the battery pack circuit breaker unit is subjected to vibration shock.

The utility model is a battery pack circuit breaker unit with a horizontal relay installation, in which the small copper bars of the high-voltage sampling circuit 6 and the low-voltage control circuit 7 are integrated in the upper cover 41 and the box body 42 by injection molding, and a plug-in terminal 16 is also provided at the connection point of the high-voltage sampling circuit 6 and the low-voltage control circuit 7, and the plug-in terminal 16 is connected to the corresponding small copper bar. This structure of the utility model realizes a wire harness-free design, making the overall assembly of the battery pack circuit breaker unit simpler, thereby realizing automated assembly and making production efficiency higher.

The utility model discloses a battery pack circuit breaker unit with a horizontally installed relay. The utility model adopts a thermal pad 13 provided at a part of the position of the main copper busbar to reduce the temperature rise of the product. The side of the box body 42 is also provided with a thermally conductive ceramic sheet 14 for heat dissipation. The thermally conductive ceramic sheet 14 is tightly attached to the inner side of the side wall of the box body 42. The thermally conductive pad 13 is sandwiched between the thermally conductive ceramic sheet 14 and the main circuit copper busbar 5. A thermally conductive pad 13 is also provided at a corresponding position on the outer side of the side wall of the box body 42. This structure of the utility model directly conducts the heat on the main circuit copper busbar to the outside of the battery pack circuit breaker unit, helping the battery pack circuit breaker unit to dissipate heat. The thermally conductive ceramic sheet has insulating properties, which can prevent the current on the main circuit copper busbar from escaping to the outside of the battery pack circuit breaker unit, causing the risk of electric shock to personnel.

The utility model is a battery pack circuit breaker unit with a horizontal relay installation, in which the small copper bar of the high-voltage sampling circuit 6 is integrated into the upper cover 41 by injection molding, and the small copper bar of the low-voltage control circuit 7 is integrated into the box body 42 by injection molding. This structure of the utility model separates the high-voltage sampling circuit and the low-voltage control circuit, and does not interfere with each other, thereby ensuring the circuit safety.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with the field can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model without departing from the scope of the technical solution of the utility model, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model should fall within the scope of protection of the technical solution of the utility model.

Claims (9)

1. A battery pack circuit breaker unit with a horizontally installed relay, comprising a shell, electronic devices installed in the shell, and a high-voltage sampling circuit and a low-voltage control circuit connected to the corresponding electronic devices, wherein the electronic devices include a main relay; characterized in that: the main relay is a relay core without a shell; the relay core is an integral structure assembled together by a contact part and a magnetic circuit part in a distribution manner in which the contact part is on the top and the magnetic circuit part is on the bottom; the main relay is installed in the shell in a horizontal manner so that the contact part of the relay core faces the side of the shell; the side of the shell is also integrated with a 2-core high-voltage plug-in and the contact part of the relay core is connected through a copper busbar; the high-voltage sampling circuit and the low-voltage control circuit both use small copper buses, and the small copper buses are integrated on the shell. 2. The battery pack circuit-breaking unit with a horizontally installed relay according to claim 1 is characterized in that: the shell includes an upper cover and a box body, the box body is provided with a receiving groove opening upward; the relay core is adapted in a side-lying manner in the receiving groove of the box body and is fixed to the box body; the contact part of the head of the relay core is provided with two static contact terminals protruding outward, and the static contact terminals are fixed to the copper busbar by bolts to realize the connection between the relay and the high-voltage circuit. 3. According to the horizontally installed relay battery pack circuit breaker unit of claim 2, it is characterized in that the small copper busbars of the high-voltage sampling circuit and the low-voltage control circuit are integrated into the upper cover and the box body by injection molding, and a plug-in terminal is also provided at the connection point of the high-voltage sampling circuit and the low-voltage control circuit, and the plug-in terminal is connected to the corresponding small copper busbar. 4. The battery pack circuit breaker unit with horizontally installed relays according to claim 3 is characterized in that: the electronic components also include a pre-charge relay, a pre-charge resistor, a fuse and a shunt; the pre-charge relay, the pre-charge resistor, the fuse and the shunt are respectively installed in the box body; the main circuit copper busbars used to connect the electronic components are distributed on the side of the box body. 5. The battery pack circuit breaker unit with horizontally installed relays according to claim 4 is characterized in that: the main relay includes a main positive relay and a main negative relay, and the copper busbar connected to one contact of each of the main positive relay and the main negative relay is connected from the side of the box body to the 2-core high-voltage plug-in on the same side. 6. The battery pack circuit breaker unit for horizontally installed relays according to claim 5, characterized in that the 2-core high-voltage plug-in is fixed on the side of the box body. 7. The battery pack circuit breaker unit with horizontally installed relays according to claim 6 is characterized in that: a thermal pad is also provided at a part of the main circuit copper busbar to reduce the temperature rise of the product. 8. The battery pack circuit breaker unit for horizontally installed relays according to claim 7 is characterized in that: a thermally conductive ceramic sheet for heat dissipation is also provided on the side of the box body, the thermally conductive ceramic sheet is tightly attached to the inner side of the side wall of the box body, and the thermally conductive pad is sandwiched between the thermally conductive ceramic sheet and the main circuit copper busbar; a thermally conductive pad is also provided at a corresponding position on the outer side of the side wall of the box body. 9. The battery pack circuit breaker unit with a horizontally installed relay according to claim 6 is characterized in that: the small copper busbar of the high-voltage sampling circuit is integrated into the upper cover by injection molding, and the small copper busbar of the low-voltage control circuit is integrated into the box body by injection molding; the high-voltage sampling circuit and the low-voltage control circuit are both in the top area of the shell, and the main circuit copper busbar is located in the middle position of the box body.