A power battery system with integrated power distribution unit

Abstract

The present invention discloses a power battery system with an integrated power distribution unit. It includes a box and a cover plate, wherein a battery module, a thermal management system, a battery management system, a DC / DC control module, a high-voltage power distribution system and a fixed frame are arranged in the box, wherein the battery management system and the DC / DC control module are fixed on the inner wall of the box, wherein the battery module is installed in the fixed frame, wherein the fixed frame is installed on the thermal management system, wherein the high-voltage power distribution system is fixed on the fixed frame, wherein the battery module is connected to the battery management system and the DC / DC control module respectively through the high-voltage power distribution system, wherein a connection interface is arranged on the outer wall of the box, wherein the output ends of the thermal management system, the battery management system and the DC / DC control module are respectively connected to the connection interface. The present invention centrally arranges the power management system, the DC / DC control module and the thermal management system inside the power battery pack, realizes an integrated layout design, reduces wiring harness connections, and improves system reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile power supplies, and in particular relates to a power battery system integrating a power distribution unit. Background Art

[0002] With the rapid development of the new "four trends" of electric vehicles (electrification, intelligence, networking, and sharing), the high integration of various systems is bound to be the trend of future development. In order to better adapt to and match the development trend of the "four trends" technology, the power battery system not only needs breakthroughs in battery cells, PACK integration, and battery management system technology, but also requires integrated and modular technologies to highlight its characteristics.

[0003] As the power source of new energy vehicles, power battery systems face inherent pressures such as cost, lightweight, safety and reliability, and it is imperative to achieve high system integration and modularization. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and provide a power battery system with an integrated power distribution unit to reduce line loops and prevent electromagnetic interference, thereby improving the reliability of the power battery system.

[0005] The technical solution adopted by the present invention is: a power battery system with an integrated power distribution unit, including a box body and a cover plate, wherein the box body is provided with a battery module, a thermal management system, a battery management system, a DC / DC control module, a high-voltage power distribution system and a fixed frame, wherein the battery management system and the DC / DC control module are fixed on the inner wall of the box body, the battery module is installed in the fixed frame, the fixed frame is installed on the thermal management system, the high-voltage power distribution system is fixed on the fixed frame, the battery module is respectively connected to the battery management system and the DC / DC control module through the high-voltage power distribution system, and a connection interface for connecting different functional devices in the vehicle is provided on the outer wall of the box body, and the output ends of the thermal management system, the battery management system and the DC / DC control module are respectively connected to the connection interface.

[0006] Furthermore, the battery module comprises a plurality of single battery groups connected in series, the top of the single battery group is covered with a module cover, an insulating sheet is arranged on the top of the module cover, and the positive and negative electrodes of the battery module are respectively led out as output terminals through arranged copper bars.

[0007] Furthermore, the thermal management system includes a supporting plate, a cooling pipe, and a transfer pipe. The supporting plate is fixed to the bottom of the box body, the cooling pipe is fixed to the supporting plate, the fixed frame is fixed to the supporting plate, both ends of the cooling pipe are respectively connected to the transfer pipe, and the ports of the two transfer pipes are respectively connected to the water inlet and outlet provided on the box body.

[0008] Furthermore, the high-voltage power distribution system includes a plurality of relays and a plurality of fuses, and the plurality of relays and the plurality of fuses are all fixed on a fixed frame.

[0009] Furthermore, the connection interface includes an electrically controlled positive electrode interface, an electrically controlled negative electrode interface, a communication interface, an air conditioning interface, a PTC interface, a DC / DC interface, a water inlet and a water outlet.

[0010] Furthermore, a detachable battery maintenance switch is provided on the outer wall of the box body, and the battery maintenance switch is connected in series in the middle of the battery module.

[0011] Furthermore, a pressure relief valve communicating with the interior of the box body is provided on the outer wall of the box body.

[0012] Furthermore, the contact surface between the box body and the cover plate is sealed and connected via a sealing ring.

[0013] Furthermore, a heating plate is provided on the side of the battery module, and the battery management system is electrically connected to the heating plate.

[0014] Furthermore, a plurality of support frames are provided on the fixed frame, and the high-voltage power distribution system is fixed on the support frames.

[0015] The beneficial effects of the present invention are:

[0016] 1) The present invention centrally arranges the power management system, DC / DC control module, thermal management system, and high-voltage power distribution system inside the power battery pack (i.e., integrated with the battery module), adopts an integral design and integrated layout, reduces wiring harness connections, achieves high integration, and implements unified heating and cooling management for the integrated battery system to improve system reliability.

[0017] 2) The battery case of the present invention adopts aluminum alloy forming technology, and the protection level reaches IP68. Through the sealing and shielding treatment of the case and the insulation and isolation design of the power supply, it can prevent electromagnetic interference, effectively reduce the impact of EMC on the control circuit, and further improve the reliability of the power battery system.

[0018] 3) The system of the present invention is provided with a relay fuse, which can protect high-voltage electrical appliances and high-voltage wiring harnesses when short-circuited or over-current occurs, and can provide charging protection measures, and can automatically disconnect the drive system when the power battery is charging.

[0019] 4) The DC / DC control module of the present invention adopts the third-generation semiconductor gallium nitride material, and the heat dissipation efficiency reaches more than 97%. The DC / DC is isolated from other components by an insulating sheet to reduce the impact of temperature inconsistency caused by heat, effectively reduce the difficulty of thermal management, and at the same time can play a good electromagnetic isolation role. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the explosion structure of the power battery system of the present invention.

[0021] Figure 2 Schematic diagram of the explosion joint of the thermal management system of the present invention.

[0022] Figure 3 It is a schematic diagram of the explosion structure of the battery module and the high-voltage power distribution system of the present invention.

[0023] In the figure, 1-cover, 2-sealing ring, 3-battery module, 4-battery management system, 5-thermal management system, 6-pressure relief valve, 7-box, 8-water inlet, 9-electrically controlled negative electrode interface, 10-communication interface, 11-air conditioning interface, 12-PTC interface, 13-battery maintenance switch, 14-electrically controlled positive electrode interface, 15-DC / DC interface, 16-water outlet, 17-high-voltage power distribution system, 18-DC / DC control module, 19-support frame, 20-transfer tube, 21-cooling pipe, 22-carrying plate, 23-module cover, 24-aluminum bar, 25-plastic bracket, 26-monocell battery pack, 27-heating plate, 28-fixed frame, 29-relay, 30-fuse, 31-copper bar, 32-insulating sheet. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1-3 As shown, the present invention provides a power battery system with an integrated power distribution unit (i.e., a battery thermal management system and a high-voltage power distribution system), including a box 7 and a cover plate 1, wherein the box 7 is provided with a battery module 3, a thermal management system 5, a battery management system 4, a DC / DC control module 18, a high-voltage power distribution system 17 and a fixed frame 28, wherein the battery management system 4 and the DC / DC control module 18 are fixed on the inner wall of the box 7, wherein the battery module 3 is installed in the fixed frame 28, wherein the fixed frame 28 is installed on the thermal management system 5, wherein the high-voltage power distribution system 17 is fixed on the fixed frame 28, wherein the battery module 3 is connected to the battery management system 4 and the DC / DC control module 18 through the high-voltage power distribution system 17, respectively, wherein a connection interface for connecting different functional devices in the vehicle is provided on the outer wall of the box 7, wherein the output ends of the thermal management system 5, the battery management system 4 and the DC / DC control module 18 are respectively connected to the connection interface. The DC / DC control module 18 includes a DC / DC conversion module and a controller, which are conventional devices.

[0026] In the above scheme, the battery module 3 includes a plurality of single battery packs 26, which are connected in series through a plastic bracket 25 and an aluminum bar 24. The top of the single battery pack 26 is covered with a module cover 23, and an insulating sheet 32 ​​is arranged on the top of the module cover 23. The positive and negative electrodes of the battery module 3 are respectively led out as output ends through the copper bar 31. The insulating sheet 32 ​​arranged in the battery module 3 can be electrically isolated, effectively reducing the influence of EMC on the control circuit, and the insulating sheet is a PC insulating sheet.

[0027] In the above scheme, the thermal management system 5 includes a carrier plate 22, a cooling pipe 21, and a transfer pipe 20. The carrier plate 22 is fixed to the bottom of the box 7, the cooling pipe 21 is fixed to the carrier plate 22, and the fixing frame 28 is fixed to the carrier plate 22. The two ends of the cooling pipe 21 are respectively connected to the transfer pipe 20, and the ports of the two transfer pipes 20 are respectively connected to the water inlet 8 and the water outlet 16 provided on the box 7. The coolant enters the cooling pipe 21 and the transfer pipe 20 in the box 7 through the water inlet 8, and performs sufficient heat exchange inside the box 7. After dissipating the heat of high-voltage devices such as the battery module 3, the battery management system 4, and the high-voltage distribution system 17, the coolant is output through the water outlet 16 to achieve the purpose of cooling the power battery system.

[0028] In the above scheme, a plurality of support frames 19 are provided on the fixed frame 28, and the high-voltage power distribution system 17 is dispersedly fixed on the plurality of support frames 19. The high-voltage power distribution system 17 includes a plurality of relays 29 and a plurality of fuses 30, which are arranged on lines connected to each connection interface, and the plurality of relays 29 and the plurality of fuses 30 are fixed on the fixed frame 28 through a plurality of support frames 19, respectively.

[0029] In the above scheme, the connection interface includes an electric control positive electrode interface 14, an electric control negative electrode interface 9, a communication interface 10, an air conditioning interface 11, a PTC interface 12, a DC / DC interface 15, a water inlet 8 and a water outlet 16. The electric control negative electrode interface 9 and the electric control positive electrode interface 14 are used to connect the motor controller and supply power to the motor controller; the communication interface 10, the air conditioning interface 11, the PTC interface 12, and the DC / DC interface 15 are respectively used to connect the communication equipment, the air conditioning, the PTC, and the DCDC equipment to supply power to each equipment.

[0030] In the above scheme, a detachable battery maintenance switch 13 is also provided on the outer wall of the box 7, and the battery maintenance switch 13 is connected in series in the middle of the battery module. When the system needs to be maintained or repaired, the high-voltage circuit of the battery module can be actively cut off by unplugging the battery maintenance switch to ensure maintenance safety.

[0031] In the above scheme, a pressure relief valve 6 connected to the inside of the box body is provided on the outer wall of the box body 7. On the one hand, the pressure relief valve 6 can be opened in time when the air pressure inside the box body reaches a certain value, release the internal air pressure, prevent the air pressure from accumulating and causing further damage, and ensure the safety of the power battery system; at the same time, when the air pressure inside the box body is low, it can be opened in time to ensure that the air pressure inside the box body is not too low to cause the shell to collapse, thereby causing safety hazards.

[0032] In the above scheme, the contact surface between the box 7 and the cover plate 1 is sealed and connected by a shielded sealing ring 2. The box of the present invention adopts aluminum alloy forming technology, and the protection level reaches IP68. Through box shielding treatment and power isolation technology, the influence of EMC on the control circuit is effectively reduced.

[0033] In the above solution, a heating sheet is provided on the side of the battery module, and the battery management system is electrically connected to the heating sheet. When the temperature is low, the heating sheet can be controlled to heat the internal temperature of the power battery, thereby improving the low-temperature performance of the power battery.

[0034] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A power battery system integrated with a power distribution unit, comprising a box (7) and a cover plate (1), characterized in that: The box (7) is provided with a battery module (3), a thermal management system (5), a battery management system (4), a DC / DC control module (18), a high-voltage power distribution system (17) and a fixed frame (28); the battery management system (4) and the DC / DC control module (18) are fixed on the inner wall of the box (7); the battery module (3) is installed in the fixed frame (28); the fixed frame (28) is installed on the thermal management system (5); the high-voltage power distribution system (17) is fixed on the fixed frame (28); the battery module (3) is connected to the battery management system (4) and the DC / DC control module (18) respectively through the high-voltage power distribution system (17); a connection interface for connecting different functional devices in the vehicle is provided on the outer wall of the box (7); the output ends of the thermal management system (5), the battery management system (4) and the DC / DC control module (18) are respectively connected to the connection interface; The battery module (3) comprises a plurality of single battery groups (26) connected in series, the top of the single battery group (26) is covered by a module cover (23), an insulating sheet (32) is arranged on the top of the module cover (23), and the positive and negative electrodes of the battery module (3) are respectively led out through copper bars (31) as output ends; The thermal management system (5) comprises a bearing plate (22), a cooling pipe (21), and a transfer pipe (20); the bearing plate (22) is fixed to the inner bottom of the box body (7); the cooling pipe (21) is fixed to the bearing plate (22); the fixing frame (28) is fixed to the bearing plate (22); both ends of the cooling pipe (21) are respectively connected to the transfer pipe (20); and the ports of the two transfer pipes (20) are respectively connected to the water inlet (8) and the water outlet (16) provided on the box body (7); The high-voltage power distribution system (17) comprises a plurality of relays (29) and a plurality of fuses (30), and the plurality of relays (29) and the plurality of fuses (30) are all fixed on a fixed frame (28).

2. The power battery system with integrated power distribution unit according to claim 1, characterized in that: The connection interface comprises an electric control positive electrode interface (14), an electric control negative electrode interface (9), a communication interface (10), an air conditioning interface (11), a PTC interface (12), a DC / DC interface (15), a water inlet (8) and a water outlet (16).

3. The power battery system with integrated power distribution unit according to claim 1, characterized in that: A detachable battery maintenance switch (13) is also provided on the outer wall of the box body (7), and the battery maintenance switch is connected in series in the middle of the battery module.

4. The power battery system with integrated power distribution unit according to claim 1, characterized in that: A pressure relief valve (6) communicating with the interior of the box body is provided on the outer wall of the box body (7).

5. The power battery system with integrated power distribution unit according to claim 1, characterized in that: The contact surface between the box body (7) and the cover plate (1) is sealed and connected via a sealing ring (2).

6. The power battery system with integrated power distribution unit according to claim 1, characterized in that: A heating plate (27) is provided on the side of the battery module (3), and the battery management system (4) is electrically connected to the heating plate (27).

7. The power battery system with integrated power distribution unit according to claim 1, characterized in that: A plurality of support frames (19) are provided on the fixed frame (28), and the high-voltage power distribution system (17) is fixed on the support frames (19).

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