Power battery system

Abstract

The utility model discloses a power battery system and relates to the technical field of power batteries. The device specifically comprises a box body, a high-voltage plug connector is arranged on the side wall of the box body, and a BDU, a BMS, at least two battery cell modules, a shunt, a main negative relay and a fuse are arranged in the box body; the positive end of the high-voltage plug connector, the BDU, the at least two battery cell modules, the shunt, the main negative relay, the fuse and the negative end of the high-voltage plug connector are sequentially connected in series through an overcurrent copper bar to form a loop; the BMS is electrically connected with the battery cell module, the BDU, the fuse and the shunt; and a PTC (Positive Temperature Coefficient) heating module for adjusting the temperature of the battery cell module is also arranged in the box body. Potential safety hazards caused by dry burning of a heating film are avoided, so that the safety of a power battery system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a power battery system. Background Art

[0002] In today's society, with the rapid development of new energy technologies and the urgent need for global resource optimization, the power battery industry has played an increasingly important role in the global energy consumption pattern. Especially in the field of pure electric vehicles, the advancement of power battery technology and the improvement of energy density have directly promoted the significant increase in the range of electric vehicles, thereby promoting the prosperity and development of the pure electric vehicle market. With the continuous breakthroughs and innovations in technology, mid-to-high-end electric vehicles have generally achieved a range of more than 800 kilometers, and the issue of range has gradually ceased to be the focus of the new energy vehicle market.

[0003] However, technological progress also brings new challenges. Traditional power battery systems generally use heating films as battery heating components to ensure that the battery can heat up quickly in low temperature environments, thereby maintaining the battery's performance. However, the heating film is prone to dry burning during operation, especially when the heating film is damaged or the electronic control system fails. The excessive temperature of the heating film will directly affect the battery module, causing the battery cell temperature to rise rapidly. Once the temperature exceeds the safe operating temperature of the battery cell, thermal runaway will occur, which in extreme cases may cause the power battery system to catch fire or even explode, seriously threatening the safety of the vehicle and passengers.

[0004] Therefore, how to avoid the safety hazards caused by dry burning of the heating film and thus improve the safety of the power battery system has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] The main purpose of the utility model is to provide a power battery system, aiming to avoid the potential safety hazard caused by dry burning of the heating film, thereby improving the safety of the power battery system.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a power battery system, including a box body, a high-voltage connector is provided on the side wall of the box body, and a BDU, a BMS, at least two battery modules, a shunt, a main negative relay, and a fuse are arranged in the box body; the positive end of the high-voltage connector, the BDU, at least two battery modules, the shunt, the main negative relay, the fuse, and the negative end of the high-voltage connector are sequentially connected in series through an overcurrent copper busbar to form a loop; the BMS is electrically connected to the battery module, the BDU, the fuse, and the shunt; and a PTC heating module for adjusting the temperature of the battery module is also provided in the box body.

[0007] In one embodiment of the present application, the battery cell module includes at least one of a 1P7S module and a 1P8S module.

[0008] In one embodiment of the present application, a smoke detector for detecting smoke after the fuse is blown is provided on one side of the fuse, and the smoke detector is communicatively connected to the BMS.

[0009] In one embodiment of the present application, the box body is also provided with a slow charging connector connected to the high-voltage connector through a high-voltage wire harness.

[0010] In one embodiment of the present application, the box body is also provided with a low-voltage connector for signal transmission.

[0011] In one embodiment of the present application, the BDU is fixed inside the box by a BDU fixing bracket.

[0012] In one embodiment of the present application, the BMS is fixed inside the box through a BMS fixing bracket.

[0013] In one embodiment of the present application, the box body includes a lower box, an upper box cover, and a sealing ring, the high-voltage connector is connected to the side wall of the lower box, and the BDU, BMS, at least two battery modules, a shunt, a main negative relay, a fuse, and a PTC heating module are all arranged in the lower box; when the upper box cover is arranged on the lower box, the sealing ring is located between the upper box cover and the lower box to seal the gap between the upper box cover and the lower box.

[0014] In one embodiment of the present application, the lower box includes a shell and a frame beam, the edge of the shell is provided with a flange extending outward, the sealing ring is provided on the flange, the frame beam is fixed inside the shell, the BDU, BMS, fuse, and shunt are fixed on the frame beam, and each peripheral side of the shell is provided with at least one lifting ear.

[0015] In one embodiment of the present application, the shell and / or the upper box cover are recessed inward to form reinforcing ribs.

[0016] With the above technical solution, since the PTC heating module is not easy to overheat during operation, the probability of material fatigue and damage is reduced, and a longer service life and higher reliability can be provided. At the same time, the PTC heating module has the ability to self-regulate heating. As the temperature rises, the resistance value of the PTC material increases, resulting in a decrease in the current passing through, and thus a decrease in the amount of heating. After the PTC heating module reaches a certain temperature, the PTC heating module can maintain a constant temperature without the need for external control, reducing the risk of overheating. The safety of the system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the explosion structure of the first embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the lower box;

[0020] Figure 3 It is an enlarged structural schematic diagram of the battery module;

[0021] 1. Upper box cover; 3. Lower box; 4. Lifting ear; 5. BMS bracket; 6. Shunt; 7. Main negative relay; 8. Fuse; 9. Smoke detector; 10. Low-voltage connector; 11. High-voltage connector; 12. BDU; 13. Sealing ring; 14. Frame beam; 15. Overcurrent copper busbar; 16. PTC heating module; 18. Slow charging connector; 19. BMS; 201. Battery cell module. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the utility model and do not constitute a limitation on the utility model.

[0023] like Figures 1 to 3 As shown, in order to achieve the above-mentioned purpose, the utility model proposes a power battery system, including a box body, a high-voltage connector 11 is provided on the side wall of the box body, and a BDU12, a BMS19, at least two battery modules 201, a shunt 6, a main negative relay 7, and a fuse 8 are provided in the box body; the positive end of the high-voltage connector 11, the BDU12, at least two battery modules 201, the shunt 6, the main negative relay 7, the fuse 8, and the negative end of the high-voltage connector 11 are sequentially connected in series through an overcurrent copper bus 15 to form a loop; the BMS19 is electrically connected to the battery module 201, the BDU12, the fuse 8, and the shunt 6; a PTC heating module 16 for adjusting the temperature of the battery module 201 is also provided in the box body.

[0024] Specifically, the box is the outer shell of the power battery system, which is used to protect the internal components from damage by the external environment, such as water, dust and external force. The high-voltage connector 11 is an interface on the box for electrically connecting the battery system to external equipment (such as the drive system of an electric vehicle). It is used to withstand and transmit high voltage and high current to ensure efficient and safe output and input of electric energy. BDU12 (Battery Discharge Unit): manages the battery discharge process to ensure that the battery discharge process is stable and efficient. BMS19 (Battery Management System): responsible for monitoring the status of the battery pack (such as temperature, voltage, current, etc.), performing fault diagnosis, and executing the control strategy of battery charging and discharging. It is the core technology to ensure battery safety and extend service life. The battery cell module 201 is a basic energy storage unit in the battery box, which is composed of multiple battery cells connected in series. The number of battery cell modules 201 in this application is two or more. The shunt 6 is a device for measuring current, which can accurately monitor the current during battery discharge and charging. The main negative relay 7 controls the connection and disconnection of the battery system with the external circuit, and plays a role in safety protection in the system. The fuse 8 is an overcurrent protection device that can automatically disconnect the circuit when the current exceeds the safety threshold to prevent damage to the electrical equipment. The PTC (Positive Coefficient Thermistor) heating module is a heating device used to adjust the temperature of the battery module 201, especially to ensure battery performance in a low temperature environment.

[0025] In the power battery system, starting from the positive end of the high-voltage connector 11, through the BDU 12, at least two battery modules 201, the shunt 6, the main negative relay 7, the fuse 8, and finally to the negative end of the high-voltage connector 11, a current loop is formed in series. The BMS 19 is electrically connected to the battery module 201, the BDU 12, the fuse 8, and the shunt 6, so that the BMS 19 can monitor and manage the status and performance of the entire battery system.

[0026] By adopting the above technical solution, since the PTC heating module 16 is not easy to overheat during operation, the probability of material fatigue and damage is reduced, and a longer service life and higher reliability can be provided. At the same time, the PTC heating module 16 has the ability to self-regulate heating. As the temperature rises, the resistance value of the PTC material increases, resulting in a decrease in the current passing through, and thus a decrease in the amount of heating. After the PTC heating module 16 reaches a certain temperature, the PTC heating module 16 can maintain a constant temperature without the need for external control, reducing the risk of overheating. The safety of the system is improved.

[0027] In one embodiment of the present application, the battery cell module 201 includes at least one of a 1P7S module and a 1P8S module.

[0028] Using the above technical solution, the 1P7S module refers to a battery cell configuration of 1 battery cell in parallel and 7 battery cells in series; the 1P8S module refers to a battery cell configuration of 1 battery cell in parallel and 8 battery cells in series. By increasing the number of series-connected battery cells (such as 7S or 8S), a higher voltage than a single battery cell can be provided, simplifying the design and integration process of the power system.

[0029] In one embodiment of the present application, a smoke detector 9 for detecting smoke after the fuse 8 is blown is provided on one side of the fuse 8 , and the smoke detector 9 is communicatively connected to the BMS 19 .

[0030] By adopting the above technical solution, when smoke is detected, the smoke detection element 9 can quickly notify the BMS19, so that the BMS19 can take emergency measures, including cutting off the power supply, triggering an alarm signal, etc., to prevent potential fire risks, protect personnel and property safety, and further improve the safety of the system.

[0031] In one embodiment of the present application, the box body is further provided with a slow-charging connector 18 connected to the high-voltage connector 11 through a high-voltage wire harness.

[0032] By adopting the above technical solution and providing the slow charging connector 18, the electric vehicle can be compatible with different charging infrastructures, thereby improving the convenience of system charging.

[0033] In one embodiment of the present application, a low-voltage connector 10 for signal transmission is also provided on the box.

[0034] By adopting the above technical solution, the low voltage connector 10 is specifically responsible for signal transmission, which can make data communication more stable and reliable. Whether it is control signal or status feedback, it can ensure accurate and timely transmission to avoid signal interference and data loss.

[0035] In one embodiment of the present application, the BDU 12 is fixed inside the box by a BDU 12 fixing bracket.

[0036] By adopting the above technical solution, stably mounting the BDU 12 inside the box through a fixed bracket can effectively reduce movement or collision caused by vehicle movement or vibration, thereby protecting the BDU 12 from damage and ensuring stable and safe operation of the battery system.

[0037] In one embodiment of the present application, the BMS 19 is fixed inside the box by a BMS 19 fixing bracket.

[0038] By adopting the above technical solution, stably mounting the BMS19 inside the box through a fixed bracket can effectively reduce movement or collision caused by vehicle movement or vibration, thereby protecting the BMS19 from damage and ensuring stable and safe operation of the battery system.

[0039] In one embodiment of the present application, the box body includes a lower box 3, an upper box cover 1, and a sealing ring 13, the high-voltage connector 11 is connected to the side wall of the lower box 3, and the BDU 12, BMS 19, at least two battery modules 201, the shunt 6, the main negative relay 7, the fuse 8, and the PTC heating module 16 are all arranged in the lower box 3; when the upper box cover 1 is covered on the lower box 3, the sealing ring 13 is located between the upper box cover 1 and the lower box 3 to seal the gap between the upper box cover 1 and the lower box 3.

[0040] Specifically, the high-voltage connector 11 is connected to the side wall of the lower box 3 to realize the power transfer between the power system and the external circuit (such as the power system of the electric vehicle). BDU12 (battery disconnect unit); BMS19 monitors and manages the status of at least two battery modules 201, including voltage, current, temperature, etc., to ensure the safety of the battery and extend its life. The shunt 6 is connected to the battery module 201 and BMS19 to balance the charge difference between each battery cell during the charging and discharging process. The main negative relay 7 and the fuse 8 are both connected between the BMS19 and the battery module 201 as safety protection measures to prevent damage caused by current overload or short circuit. The PTC heating module 16 is also arranged in the lower box 3, adjacent to the battery module 201, and is used to provide a constant temperature environment for the battery in a low temperature environment to ensure battery performance.

[0041] BDU12, BMS19, shunt 6, main negative relay 7, fuse 8 and PTC heating module 16 are all arranged inside the lower box 3 for centralized management, convenient connection and maintenance. The upper box cover 1 is tightly covered on the upper part of the lower box 3, and the sealing ring 13 is located between the upper box cover 1 and the lower box 3 to ensure the airtightness of the box. The high-voltage connector 11 is located on the side wall of the lower box 3 for easy connection with external equipment.

[0042] By adopting the above technical solution, the key electrical components are centrally arranged in the lower box 3, which is convenient for interconnection. At the same time, the internal layout is reasonable, which reduces the clutter of wires and improves the reliability and stability of the system. The design of the sealing ring 13 between the upper box cover 1 and the lower box 3 ensures the airtightness of the box body, effectively blocks the entry of foreign matter such as moisture and dust, protects the internal electronic components from damage, and prolongs the service life of the battery system. The design of the upper box cover 1 makes it easy to access all the internal electronic components by simply opening the upper box cover 1 when maintenance or inspection is required, simplifying the maintenance process.

[0043] In one embodiment of the present application, the lower box 3 includes a shell and a frame beam 14, the edge of the shell is provided with a flange extending outward, the sealing ring 13 is arranged on the flange, the frame beam 14 is fixed inside the shell, the BDU 12, BMS 19, fuse 8, and shunt 6 are fixed on the frame beam 14, and each peripheral side of the shell is provided with at least one lifting ear 4.

[0044] Specifically, the frame beam 14 is fixed inside the shell as the main supporting structure, providing a solid platform for stably mounting components such as the BDU 12 , the BMS 19 , the fuse 8 , the shunt 6 , etc. thereon.

[0045] BDU12, BMS19, fuse 8, shunt 6 are all directly fixed on the frame beam 14, and connected to the battery module and external circuit through wires or cables to form a complete battery management and protection system. The edge of the shell is provided with a flange extending outward, and the sealing ring 13 is arranged on the flange. When the upper cover is closed, it combines with the flange of the upper box to form a sealing structure. The shell is the peripheral structure of the lower box 3, and its edge has a flange for installing the sealing ring 13. At the same time, each peripheral side of the shell is provided with at least one lifting ear 4 to facilitate the transportation and fixation of the entire lower box 3.

[0046] By adopting the above technical solution, a frame beam 14 is arranged inside the housing to provide a solid support for installing electrical components, ensuring stability and durability during transportation and use. The cooperation of the flange and the sealing ring 13 ensures a good seal between the lower box 3 and the upper box, effectively preventing the intrusion of moisture, dust and other external impurities, and protecting the internal components.

[0047] In one embodiment of the present application, the shell and / or the upper box cover 1 are recessed inward to form reinforcing ribs.

[0048] By adopting the above technical solution, the reinforcing ribs formed by the inner concave shape can effectively improve the structural strength and rigidity of the shell and the upper box cover 1, so that they can withstand greater external forces or impacts and reduce the risk of damage caused by collision or pressure.

[0049] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A power battery system, characterized in that: It comprises a box body, a high-voltage connector is arranged on the side wall of the box body, a BDU, a BMS, at least two battery modules, a shunt, a main negative relay, and a fuse are arranged in the box body; the positive end of the high-voltage connector, the BDU, at least two battery modules, the shunt, the main negative relay, the fuse, and the negative end of the high-voltage connector are sequentially connected in series through an overcurrent copper busbar to form a loop; the BMS is electrically connected to the battery module, the BDU, the fuse, and the shunt; a PTC heating module for adjusting the temperature of the battery module is also arranged in the box body.

2. The power battery system according to claim 1, characterized in that: The battery cell module includes at least one of a 1P7S module and a 1P8S module.

3. The power battery system according to claim 1, characterized in that: A smoke detector is provided on one side of the fuse for detecting smoke after the fuse is blown, and the smoke detector is communicatively connected to the BMS.

4. The power battery system according to claim 1, characterized in that: The box body is also provided with a slow-charging connector which is connected to the high-voltage connector through a high-voltage wire harness.

5. The power battery system according to claim 1, characterized in that: The box body is also provided with a low-voltage connector for signal transmission.

6. The power battery system according to claim 1, characterized in that: The BDU is fixed inside the box through a BDU fixing bracket.

7. The power battery system according to claim 1, characterized in that: The BMS is fixed inside the box through a BMS fixing bracket.

8. The power battery system according to any one of claims 1 to 7, characterized in that: The box body includes a lower box, an upper box cover, and a sealing ring. The high-voltage connector is connected to the side wall of the lower box. The BDU, BMS, at least two battery modules, a shunt, a main negative relay, a fuse, and a PTC heating module are all arranged in the lower box. When the upper box cover is arranged on the lower box, the sealing ring is located between the upper box cover and the lower box to seal the gap between the upper box cover and the lower box.

9. The power battery system according to claim 8, characterized in that: The lower box includes a shell and a frame beam. The edge of the shell is provided with a flange extending outward, the sealing ring is arranged on the flange, the frame beam is fixed inside the shell, the BDU, BMS, fuse, and shunt are fixed on the frame beam, and each peripheral side of the shell is provided with at least one lifting ear.

10. The power battery system according to claim 9, characterized in that: The shell body and / or the upper box cover are recessed inwardly to form reinforcing ribs.

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