Power battery pack, battery system and vehicle

Abstract

The utility model discloses a power battery pack, a battery system and a vehicle, and relates to the technical field of batteries. The power battery pack comprises a shell, a first battery pack, a second battery pack and a control unit, wherein the shell is provided with an accommodating cavity; the first battery pack and the second battery pack are arranged in the accommodating cavity, the output voltage of the first battery pack is higher than that of the second battery pack, and the first battery pack is connected with the second battery pack; the control unit is arranged in the containing cavity and electrically connected with the first battery pack and the second battery pack. According to the power battery pack provided by the embodiment of the invention, the first battery pack and the second battery pack are arranged in the same shell, so that the independent space occupied by the low-voltage battery is reduced, the space resource occupied by the battery is reduced, and the space utilization rate is improved. In addition, the control unit is respectively connected with the two groups of batteries in the accommodating cavity, external complex lines are reduced, line loss and fault risk are reduced, and system stability and reliability are enhanced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to power battery packs, battery systems and vehicles. Background Technology

[0002] In electric and hybrid vehicles, low-voltage and high-voltage battery systems are typically combined to enable normal vehicle operation. The high-voltage battery, as the primary power source, provides high-voltage power output to the main drive motor, thus propelling the vehicle; while the low-voltage battery provides a stable low-voltage power supply to the vehicle's electrical systems.

[0003] Currently, in most vehicles, low-voltage batteries are typically configured as a separate component and installed outside the high-voltage battery pack. This separate approach occupies additional space, leading to limited space in the vehicle's layout. Utility Model Content

[0004] This application provides a power battery pack, battery system, and vehicle that reduces the space occupied by the battery and improves space utilization.

[0005] In a first aspect, embodiments of this application provide a power battery pack, the power battery pack comprising:

[0006] The shell has a receiving cavity;

[0007] The first battery pack and the second battery pack are disposed in the receiving cavity, and the output voltage of the first battery pack is higher than the output voltage of the second battery pack.

[0008] The control unit is located inside the receiving cavity and is electrically connected to the first battery pack and the second battery pack respectively.

[0009] In some embodiments, the power battery pack further includes:

[0010] The first crossbeam is disposed in the receiving cavity and connected to the housing. A first battery pack is provided on one side of the first crossbeam, and a second battery pack and a control unit are provided on the side of the first crossbeam opposite to the first battery pack.

[0011] In some embodiments, the first battery pack includes a first battery module;

[0012] The battery pack also includes:

[0013] The second crossbeam is located inside the receiving cavity and connected to the housing. The first and second crossbeams intersect and are arranged on the side of the first battery module. Wiring harnesses are arranged on the first and second crossbeams, and the wiring harnesses are respectively connected to the control unit and the first battery module.

[0014] In some embodiments, the power battery pack further includes:

[0015] A heat dissipation element is disposed within the receiving cavity. The heat dissipation element is disposed on one side of the first battery pack and the second battery pack, and covers the surfaces of the first battery pack and the second battery pack facing the heat dissipation element.

[0016] In some embodiments, the heat dissipation element has an inlet and an outlet;

[0017] The shell has a first hole and a second hole. The inlet and the first hole are connected by an inlet pipe, and the outlet and the second hole are connected by an outlet pipe.

[0018] In some embodiments, the power battery pack further includes:

[0019] A fixed bracket is installed inside the receiving cavity and connected to the housing. The fixed bracket is located on the side of the heat dissipation element facing the housing, and the fixed bracket is connected to the heat dissipation element.

[0020] In some embodiments, an output connector is provided at one end of the housing near the second battery pack, and the output connector is connected to the second battery pack.

[0021] In some embodiments, the power battery pack further includes:

[0022] The temperature detection unit is located inside the cavity and is connected to the control unit.

[0023] Secondly, embodiments of this application provide a battery system including the power battery pack described in the above embodiments.

[0024] Thirdly, embodiments of this application also provide a vehicle that includes the battery system described in the above embodiments, or includes the power battery pack described in the above embodiments.

[0025] Beneficial Effects: The power battery pack of this application embodiment includes a housing, a first battery pack, a second battery pack, and a control unit. The housing has a receiving cavity. The first and second battery packs are disposed within the receiving cavity, with the output voltage of the first battery pack being higher than that of the second battery pack, and the first and second battery packs being connected. The control unit is disposed within the receiving cavity and is electrically connected to both the first and second battery packs. This power battery pack of the application embodiment places the first and second battery packs within the same housing, reducing the space occupied by the low-voltage battery and improving space utilization. Furthermore, the control unit connects to both battery packs within the receiving cavity, reducing complex external wiring, lowering wiring losses and fault risks, and enhancing system stability and reliability.

[0026] The battery system of this application embodiment includes the power battery pack described above. Therefore, the battery system can have all the technical features and beneficial effects of the power battery pack described above, which will not be repeated here.

[0027] The vehicle in this application embodiment includes the power battery pack or battery system described above. Therefore, the vehicle can have all the technical features and beneficial effects of the power battery pack or battery system described above, which will not be repeated here. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a power battery pack provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of another structure of the power battery pack provided in an embodiment of this application;

[0031] Figure 3 A schematic diagram of a heat dissipation element for a power battery pack provided in an embodiment of this application;

[0032] Figure 4 This is another structural schematic diagram of the power battery pack provided in the embodiments of this application;

[0033] Figure 5 This is another structural schematic diagram of the power battery pack provided in the embodiments of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10. Housing; 11. Receiving cavity; 12. First hole; 13. Second hole; 14. Output connector; 15. Connector;

[0036] 20. First battery pack; 21. First battery module;

[0037] 30. Second battery pack;

[0038] 40. Control unit;

[0039] 50. First crossbeam;

[0040] 60. Second crossbeam;

[0041] 70. Heat dissipation element; 71. Water inlet; 72. Water outlet;

[0042] 80. Fixed bracket;

[0043] 90. Temperature detection unit. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0045] In the field of electric and hybrid vehicles, the organic integration of low-voltage and high-voltage battery systems has become an essential and common technological approach to ensure stable and efficient vehicle operation. High-voltage batteries play a crucial role as the core power source in the entire powertrain system, providing high-voltage power output to the main drive motor to drive the vehicle smoothly and meet its power demands under various road conditions and driving scenarios. Complementing this, low-voltage batteries are primarily responsible for providing a stable low-voltage power supply to the vehicle's electrical systems, ensuring the normal operation of numerous low-voltage electrical devices such as vehicle lighting, in-vehicle entertainment systems, various sensors, and some auxiliary control units, and maintaining a stable internal electrical environment.

[0046] In some embodiments, the low-voltage battery can be configured as a separate component and installed in the external space of the high-voltage battery pack. While this separate design achieves a certain degree of functional differentiation between the high- and low-voltage batteries, it inevitably leads to a series of drawbacks. First, the independently located low-voltage battery occupies additional vehicle space, making the interior space of the vehicle cramped and limiting the overall space utilization of the vehicle.

[0047] Furthermore, as a separate component independent of the high-voltage battery pack, the low-voltage battery not only has its own casing for physical protection and electrical isolation, but also is equipped with an independent control module for precisely managing the charging and discharging process and monitoring the battery's status. However, while these independent casings and control modules perform their respective functions, they inevitably occupy some space. Additionally, because the high-voltage battery pack and the low-voltage battery are separate, power transmission between them must be achieved through power supply harnesses. The wiring of these power supply harnesses within the vehicle not only requires significant space but also increases the complexity and difficulty of the wiring, while also raising the potential risk of electrical faults caused by improper harness placement.

[0048] In view of this, embodiments of this application provide a power battery pack, a battery system, and a vehicle, which reduce the space resources occupied by the battery and improve space utilization.

[0049] Please see Figure 1 and Figure 2 As shown, Figure 1This is a schematic diagram of a power battery pack provided in an embodiment of this application. Figure 2 This is a schematic diagram of another structure of the power battery pack provided in an embodiment of this application.

[0050] This application provides a power battery pack, which includes: a housing 10, a first battery pack 20, a second battery pack 30, and a control unit 40. The housing 10 has a receiving cavity 11. The first battery pack 20 and the second battery pack 30 are disposed in the receiving cavity 11, and the output voltage of the first battery pack 20 is higher than the output voltage of the second battery pack 30. The control unit 40 is disposed in the receiving cavity 11 and is electrically connected to the first battery pack 20 and the second battery pack 30 respectively.

[0051] In some embodiments, the first battery pack 20 can be a power battery pack, which may consist of at least one power battery module. These power battery modules can be connected together in a specific series-parallel connection manner, which is set according to the actual implementation requirements to meet the vehicle's demand for high voltage and high power output. The second battery pack 30 can be a low-voltage lithium-ion battery pack, which may consist of at least one low-voltage lithium-ion battery. These low-voltage lithium-ion batteries can also be connected together in a specific series-parallel connection manner, which is set according to the actual implementation requirements to provide stable low-voltage power support for the vehicle's electrical system.

[0052] In some embodiments, the control unit 40 may adopt a dual-control module integrated architecture. Specifically, the control unit 40 includes a first control module and a second control module, that is, the control unit 40 includes two control modules. The first control module corresponds to the first battery pack 20, and the second control module corresponds to the second battery pack 30. The first control module is specifically responsible for establishing an electrical connection with the first battery pack 20 to monitor and control it. The second control module is electrically connected to the second battery pack 30 to monitor and control it. Furthermore, within the control unit 40, the first and second control modules can be connected, allowing the first battery pack 20 to charge the second battery pack 30 under the control of the control unit 40. By integrating these two control modules into the same control unit 40, space utilization is optimized to a certain extent.

[0053] In other embodiments, the control unit 40 may be controlled by a single control module. Specifically, the control unit 40 includes a control module connected to both the first battery pack 20 and the second battery pack 30. This control module, based on a preset program, can simultaneously coordinate the control of both the first battery pack 20 and the second battery pack 30, thus optimizing space utilization.

[0054] It should be noted that the control module in this application can integrate a multi-level, multi-functional circuit structure based on the actual implementation requirements, so as to enable the monitoring and control of the first battery pack 20 and the second battery pack 30 through the control unit 40, and to enable the first battery pack 20 to charge the second battery pack 30 through the control unit 40. Furthermore, in the power battery pack, the control unit 40 is connected to the first battery pack 20 and the second battery pack 30 respectively, and the first battery pack 20 and the second battery pack 30 are interconnected. The control unit 40 can be connected to the first battery pack 20 and the second battery pack 30 respectively through connectors 15, and the first battery pack 20 and the second battery pack 30 can also be connected to each other through connectors 15. Connectors 15 can be high-voltage connectors such as copper busbars or aluminum busbars. In this application, the control unit 40, the first battery pack 20, and the second battery pack 30 are physically connected end-to-end to form a series circuit, creating a complete series current path. Inside the control unit, the first battery pack 20 and the second battery pack 30 can be connected to corresponding circuit structures to enable the control unit 40 to monitor and control both the first and second battery packs 20 and 30, and to allow the first battery pack 20 to charge the second battery pack 30 via the control unit 40. Furthermore, in this application, the housing 10 can be a half-housing unit. This half-housing configuration allows the side opposite to the housing 10 to be directly integrated with the vehicle chassis or body frame, forming an integrated structure through welding or high-strength bolts. This reduces the material usage of the housing 10, lowers the overall vehicle weight, and enhances the battery pack's collision resistance by utilizing the vehicle structure. Alternatively, the housing 10 can be a complete unit. A complete housing 10 employs a fully enclosed box structure, offering greater structural independence and versatility.

[0055] Through the above technical solution, the low-voltage lithium-ion battery of this application is integrated into the power battery pack assembly. The control module of the low-voltage lithium-ion battery and the control module of the power battery are integrated into a single control unit 40, forming a highly integrated power battery pack assembly. Specifically, in this application, the first battery pack 20 and the second battery pack 30 are both housed within the receiving cavity 11 of the housing 10. A single housing 10 can simultaneously protect both the first battery pack 20 and the second battery pack 30, reducing the space occupied by the additional independent casing of the second battery pack 30. Within the receiving cavity 11, the first battery pack 20 and the second battery pack 30 are interconnected. Compared to keeping the low-voltage lithium-ion battery separate from the high-voltage battery pack, this significantly shortens the charging path from the first battery pack 20 to the second battery pack 30 (i.e., from the power battery pack to the low-voltage lithium-ion battery). Furthermore, since both are arranged within the same housing 10, the charging cable does not need to bypass complex external spaces and can be directly connected within the housing 10, thereby reducing the length of the charging cable. This not only reduces material costs but also reduces energy loss due to cable resistance, improving charging efficiency. Furthermore, the control of the first battery pack 20 and the second battery pack 30 is integrated within the housing 11 via a control unit 40, optimizing space utilization and reducing the length of the wiring harness connecting the control unit 40 to the first battery pack 20 and the second battery pack 30. This application integrates the first battery pack 20 and the second battery pack 30, as well as the control unit 40. From a vehicle perspective, this requires less space, reduces the number of components, and improves space utilization.

[0056] Please see Figure 2 As shown. In some embodiments, the power battery pack further includes: a first crossbeam 50, which is disposed in the receiving cavity 11 and connected to the housing 10; a first battery pack 20 is provided on one side of the first crossbeam 50; and a second battery pack 30 and a control unit 40 are provided on the side of the first crossbeam 50 opposite to the first battery pack 20.

[0057] Understandably, the first crossbeam 50 is positioned within the receiving cavity 11, possibly using welding, bolting, or riveting processes to ensure that the first crossbeam 50 and the housing 10 form a tight and stable integral structure. The first crossbeam 50 plays a crucial role in spatial separation and support within the receiving cavity 11. The first battery pack 20, i.e., the power battery pack, is housed on one side of the first crossbeam 50. On the other side of the first crossbeam 50, opposite to the first battery pack 20, the second battery pack 30 and the control unit 40 are located. The second battery pack 30 serves as a low-voltage lithium-ion battery pack. The presence of the first crossbeam 50 effectively isolates the high- and low-voltage battery packs, reducing the risk of electromagnetic interference. Furthermore, placing the second battery pack 30 and the control unit 40 on the same side of the first crossbeam 50 allows the control unit 40 to be adjacent to both the first battery pack 20 and the second battery pack 30, further reducing the wiring harness length connecting the control unit 40 to the first battery pack 20 and the second battery pack 30, and simplifying the wiring layout.

[0058] Please see Figure 2 As shown. In some embodiments, the first battery pack 20 includes a first battery module 21; the power battery pack also includes a second crossbeam 60, which is disposed in the receiving cavity 11 and connected to the housing 10. The first crossbeam 50 and the second crossbeam 60 are intersecting and arranged on the side of the first battery module 21. Wiring harnesses are arranged on the first crossbeam 50 and the second crossbeam 60, and the wiring harnesses are respectively connected to the control unit 40 and the first battery pack 20.

[0059] Understandably, the first battery pack 20 includes at least one first battery module 21, meaning the first battery pack 20 can be composed of at least one power battery module. The first crossbeam 50 and the second crossbeam 60 can be connected by processes such as welding, bolting, or riveting.

[0060] In some embodiments, the first battery pack 20 includes a first battery module 21, and the number of second crossbeams 60 can be one. The second crossbeam 60 can intersect with the first crossbeam 50 to form a T-shape and be arranged on the side of the first battery module 21, that is, arranged on both sides of the first battery module 21. The wiring harness can then be laid out based on the positions of the first crossbeam 50 and the second crossbeam 60. Wire grooves or wire clamps can be pre-set on the crossbeams to securely fix the wiring harness. Alternatively, if there are two second crossbeams 60, the two second crossbeams 60 can intersect with the first crossbeam 50 and be arranged on the side of the first battery module 21, that is, the two second crossbeams 60 are arranged on two opposite sides of the first battery module 21. It should be noted that the number of second crossbeams 60 can also be two or more, and the number and position of the second crossbeams 60 are specifically set according to the actual implementation requirements.

[0061] In other embodiments, the first battery pack 20 includes a plurality of first battery modules 21, which can be arranged in a matrix array. There can be one second crossbeam 60, which can intersect with the first crossbeam 50 to form a T-shape, positioned between any two rows of the plurality of first battery modules 21. The wiring harness can then be laid out based on the positions of the first crossbeam 50 and the second crossbeam 60, with pre-set wire grooves or clamps on the crossbeams to securely fix the wiring harness. Alternatively, there can be multiple second crossbeams 60, each positioned between any two rows of the plurality of first battery modules 21. The number and position of the second crossbeams 60 are specifically determined according to the requirements of the actual implementation scheme.

[0062] It should be noted that the power battery pack in this application may also include other crossbeams intersecting with the second crossbeam 60, so that the first crossbeam 50, the second crossbeam 60, and other crossbeams can be adapted to each other into I-shaped, rectangular, or grid-like shapes, to ensure that the intersection of the crossbeams can effectively separate the multiple first battery modules 21 in the first battery pack 20, and separate the first battery pack 20 from the second battery pack 30 and the control unit 40. The number and position of the crossbeams are specifically set according to the actual implementation requirements. In addition, in this application, the first battery module 21 can be bonded to the adjacent crossbeams with structural adhesive so that the first battery module 21 can be firmly fixed in the receiving cavity 11 of the housing 1010.

[0063] Understandably, the crossbeams in this application play a crucial role in spatial separation and support. When significant vibrations and impacts occur, the second crossbeam 60, in conjunction with the first crossbeam 50, can evenly distribute these external forces throughout the housing 10, reducing localized pressure within the housing 10 and better ensuring the stable operation of the components within the housing 10. Furthermore, the presence of the crossbeams achieves effective physical isolation between the high and low voltage battery packs, reducing the risk of electromagnetic interference. Moreover, the arrangement of the second crossbeam 60 allows for the rational planning of the positional layout of the first battery module 21 and reduces mutual interference between the first battery modules 21. Additionally, wiring harnesses are laid on the first and second crossbeams 50 and 60, respectively connecting the control unit 40 and the first battery pack 20, enabling the transmission of monitoring and control signals between the control unit 40 and the first battery pack 20. By arranging the wiring harnesses on the crossbeams, orderly wiring management is achieved, reducing the random tangling of wiring harnesses within the receiving cavity 11, lowering the possibility of mutual interference between wiring harnesses, and improving the stability of signal transmission and the efficiency of power transmission. Furthermore, based on the structure of the crossbeams, the installation and fixing of the wiring harnesses are more convenient. Please see Figure 3 As shown, Figure 3 This is a schematic diagram of a heat dissipation element for a power battery pack provided in an embodiment of this application.

[0064] In some embodiments, the power battery pack further includes a heat dissipation element 70, which is disposed in the receiving cavity 11, and is disposed on one side of the first battery pack 20 and the second battery pack 30, and covers the surfaces of the first battery pack 20 and the second battery pack 30 facing the heat dissipation element 70.

[0065] Understandably, the heat dissipation element 70 is located on one side of the first battery pack 20 and the second battery pack 30, and fully covers the surfaces of the first battery pack 20 and the second battery pack 30 facing the heat dissipation element 70. This allows for rapid heat dissipation of the entire interior of the housing 11, maintaining a suitable operating temperature range within the housing 11, effectively slowing down the rate of battery capacity degradation, extending its service life, and ensuring long-term stable power output for the vehicle. Furthermore, the heat dissipation element 70 is located within the housing 11, between the housing 10 and the first battery pack 20 and the second battery pack 30, and covers the surfaces of the first battery pack 20 and the second battery pack 30 facing the heat dissipation element 70. This fully utilizes the space on one side of the battery pack, eliminating the need for additional independent space for heat dissipation. This aligns with the overall spatial layout of the power battery pack, resulting in a compact and rational layout of the components, achieving functional integration and optimization within a limited space.

[0066] It should be noted that, from a heat dissipation principle perspective, the heat dissipation element 70 may employ air cooling, liquid cooling, or a combination of both. If air cooling is used, the surface of the heat dissipation element 70 will have numerous heat dissipation fins to increase the heat dissipation area. Heat will be carried away by the airflow generated by a fan or the natural wind generated by vehicle movement. If liquid cooling is used, the heat dissipation element 70 will have internal coolant channels where the coolant circulates, absorbing heat and then dissipating it to the outside through a heat exchanger.

[0067] In some embodiments, liquid cooling is used for heat dissipation, that is, the heat dissipation element 70 may include a liquid cooling plate, and the liquid cooling plate is disposed in the receiving cavity 11, disposed on one side of the first battery pack 20 and the second battery pack 30, and covers the surfaces of the first battery pack 20 and the second battery pack 30 facing the liquid cooling plate.

[0068] Please see Figure 3 As shown. In some embodiments, the heat dissipation element 70 has a water inlet 71 and a water outlet 72; the housing 10 has a first hole 12 and a second hole 13, the water inlet 71 and the first hole 12 are connected by a water inlet pipe (not shown in the figure), and the water outlet 72 and the second hole 13 are connected by a water outlet pipe (not shown in the figure).

[0069] Specifically, the positions of the first hole 12 and the second hole 13 need to be close to the inlet 71 and outlet 72, thereby significantly shortening the connection path of the inlet and outlet pipes. Shorter pipe lengths mean a substantial reduction in frictional resistance encountered by the coolant during circulation. Furthermore, it reduces the space occupied by the pipes within the housing 11, contributing to improved space utilization of the entire battery pack.

[0070] Understandably, the heat dissipation element 70 includes a liquid cooling plate, with the inlet 71 and outlet 72 located on the liquid cooling plate. The inlet pipe can pass through the first hole 12 on the housing 10 and connect to the inlet 71, while the outlet pipe can pass through the second hole 13 on the housing 10 and connect to the outlet 72. This allows coolant to enter the liquid cooling plate through the inlet pipe. The inlet 71 is the entrance for the coolant into the liquid cooling plate, and the internal structure of the liquid cooling plate is designed to guide the coolant to flow evenly into the plate. These channels are precisely arranged inside the heat dissipation element 70, for example, using a serpentine, parallel, or interdigitated pattern to maximize the contact area between the coolant and the heat dissipation element 70, thereby achieving efficient absorption of heat dissipated by the battery pack. The outlet 72 is responsible for expelling the coolant after heat absorption from the heat dissipation element 70 for subsequent heat exchange and cooling. The arrangement of these two ports is designed to create a circulation channel for the coolant. It should be noted that the flow channels inside the liquid cooling plate cover the control unit 40, the first battery pack 20, and the second battery pack 30 facing the surface of the liquid cooling plate, so that the entire interior of the housing cavity 11 can be quickly cooled.

[0071] Please see Figure 2 and Figure 3 As shown. In some embodiments, the power battery pack further includes: a fixing bracket 80, which is disposed in the receiving cavity 11 and connected to the housing 10. The fixing bracket 80 is disposed on the side of the heat dissipation element 70 facing the housing 10, and the fixing bracket 80 is connected to the heat dissipation element 70.

[0072] In some embodiments, the fixing bracket 80 can be a frame structure. The main body of the fixing bracket 80 can have a grid-like or honeycomb-like hollow design, which minimizes the obstruction of the heat dissipation element 70 while ensuring structural strength and improving heat dissipation efficiency. Furthermore, by reasonably setting the layout of the horizontal and vertical beams of the frame, the overall stability and rigidity can be effectively enhanced.

[0073] In other embodiments, the mounting bracket 80 can also be a plate-like or modular structure. A plate-like structure can fit snugly against the back of the heat dissipation element 70, providing a stable support surface. A modular structure combines a frame with a plate-like structure to meet the installation requirements of different components. It should be noted that the surface of the mounting bracket 80 can be provided with specific grooves, protrusions, or mounting holes. These structural features are designed to adapt to the mounting positions on the heat dissipation element 70, ensuring a tight and stable connection. For example, the grooves on the mounting bracket 80 can precisely fit the edges of the heat dissipation element 70 to prevent displacement of the heat dissipation element 70 during vehicle operation; or the mounting holes can be aligned with corresponding screw holes on the heat dissipation element 70, achieving a reliable connection through bolt tightening. Furthermore, the mounting bracket 80 can be an integral part of the housing 10, or it can be precisely aligned with the positioning holes on the inner wall of the housing 10 using preset positioning pins, or it can be fixed to the housing 10 using anti-loosening bolts or welding.

[0074] Understandably, the fixing bracket 80 is located on the side of the heat dissipation element 70 facing the housing 10 and is connected to both the heat dissipation element 70 and the housing 10. This provides reliable physical support for the heat dissipation element 70 and the housing 10, ensuring that the heat dissipation element 70 and the housing 10 can maintain a stable position even when encountering severe vibrations and bumps caused by complex road conditions during vehicle operation. This reduces problems such as loose electrical connections and damaged wiring caused by displacement, and ensures the normal operation of the entire battery system.

[0075] Please see Figure 4 As shown, Figure 4 This is another structural schematic diagram of the power battery pack provided in the embodiments of this application.

[0076] In some embodiments, the housing 10 is provided with an output connector 14 at one end near the second battery pack 30, and the output connector 14 is connected to the second battery pack 30.

[0077] Understandably, the second battery pack 30 (low-voltage lithium-ion battery pack) is primarily responsible for providing a stable low-voltage power supply to the vehicle's electrical system, ensuring the normal operation of numerous low-voltage electrical devices such as vehicle lighting, in-vehicle entertainment systems, various sensors, and some auxiliary control units 40, and maintaining the stable operation of the vehicle's internal electrical environment. Therefore, a dedicated mounting position for the output connector 14 is reserved at the end of the housing 10 closest to the second battery pack 30. The housing 10 has mounting slots or holes that match the shape of the output connector 14, and the output connector 14 is securely mounted to the housing 10 using clips, screws, or glue. Then, within the receiving cavity 11, the output connector 14 connects to the second battery pack 30, allowing the low-voltage lithium-ion battery to output energy through the output connector 14. Furthermore, the position of the output connector 14 close to the second battery pack 30 significantly shortens the connection path between the output connector 14 and the second battery pack 30. Furthermore, it reduces the space occupied by the connecting harness within the housing cavity 11, which helps to improve the space utilization of the entire power battery pack.

[0078] Please see Figure 5 As shown, Figure 5 This is another structural schematic diagram of the power battery pack provided in the embodiments of this application.

[0079] In some embodiments, the power battery pack further includes a temperature detection unit 90, which is disposed within the receiving cavity 11 and connected to the control unit 40.

[0080] In some embodiments, the temperature detection unit 90 can be a thermistor temperature sensor, a thermocouple temperature sensor, or a digital temperature sensor. Furthermore, there can be multiple temperature detection units 90, each positioned at a critical location within the housing cavity 11. For example, in the first battery pack 20, multiple temperature detection units 90 can be evenly distributed near different first battery modules 21, particularly near electrode connections and the center of the battery cells, where heat is prone to accumulate. For the second battery pack 30, the temperature detection units 90 can be located near the second battery pack 30. Additionally, a temperature detection unit 90 is also placed near the control unit 40. During operation, the electronic components inside the control unit 40 generate heat. If the temperature is too high, it may affect the normal operation of the control unit 40, leading to deviations in the control of the battery pack. By monitoring the temperature near the control unit 40, overheating problems can be detected in a timely manner, allowing for appropriate heat dissipation measures to ensure stable operation of the control unit 40. Simultaneously, temperature detection units 90 can also be placed in the corners and vents of the housing cavity 11 to monitor changes in the ambient temperature throughout the housing cavity 11 and comprehensively assess the thermal environment of the battery pack.

[0081] It should be noted that, in actual operation, the heat dissipation conditions of different parts are different. For example, the temperature on the side closer to the heat dissipation element 70 is relatively low, while the temperature on the side farther away from the heat dissipation element 70 may be higher. By setting temperature detection units 90 at multiple locations, the temperature field distribution of the low-voltage lithium-ion battery cell module can be fully grasped, providing more accurate data support for the thermal management system.

[0082] Furthermore, the temperature is monitored in real time by the temperature detection unit 90. The control unit 40 can control the opening of the coolant flow regulating valve based on the data fed back from the temperature sensor. In low-temperature environments, it reduces the coolant flow through the liquid cooling plate to ensure the performance of the power battery; in high-temperature environments, it increases the coolant flow through the liquid cooling plate to quickly reduce the temperature inside the housing 11. This keeps the housing 11 within a suitable operating temperature range, significantly improving the overall performance and lifespan of the battery pack, while simultaneously reducing the energy consumption of the vehicle's thermal management system.

[0083] Secondly, embodiments of this application provide a battery system including the power battery pack described in the above embodiments.

[0084] It is understood that the battery system of this application embodiment includes the power battery pack described above. Therefore, the battery system can have all the technical features and beneficial effects of the power battery pack described above, which will not be repeated here.

[0085] Thirdly, embodiments of this application also provide a vehicle that includes the battery system described in the above embodiments, or includes the power battery pack described in the above embodiments.

[0086] The vehicle provided in this application embodiment is equipped with the battery system described in the above embodiments, or directly uses the power battery pack described in the above embodiments. Because the power battery pack reduces the space occupied by the battery, it improves space utilization. In terms of spatial layout, the compact design of the power battery pack frees up more usable space inside the vehicle.

[0087] It is understood that the vehicle in the embodiments of this application includes the power battery pack or battery system described above. Therefore, the vehicle can have all the technical features and beneficial effects of the power battery pack or battery system described above, which will not be repeated here.

[0088] In the description of this application, it should be understood that the terms "upper," "lower," "inner," "outer," "row," "column," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "multiple" means two or more, and at least one can mean one, two, or more, unless otherwise explicitly specified.

[0089] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0090] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0091] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0092] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power battery pack, characterized in that, include: The housing (10) has a receiving cavity (11); A first battery pack (20) and a second battery pack (30) are disposed in the receiving cavity (11), wherein the output voltage of the first battery pack (20) is higher than the output voltage of the second battery pack (30); A control unit (40) is disposed in the receiving cavity (11), and the control unit (40) is electrically connected to the first battery pack (20) and the second battery pack (30) respectively.

2. The power battery pack according to claim 1, characterized in that, Also includes: A first crossbeam (50) is disposed in the receiving cavity (11) and connected to the housing (10). The first battery pack (20) is disposed on one side of the first crossbeam (50), and the second battery pack (30) and the control unit (40) are disposed on the side of the first crossbeam (50) opposite to the first battery pack (20).

3. The power battery pack according to claim 2, characterized in that, The first battery pack (20) includes a first battery module (21); The power battery pack also includes: The second crossbeam (60) is disposed in the receiving cavity (11) and connected to the housing (10). The first crossbeam (50) and the second crossbeam (60) are intersected and arranged on the side of the first battery module (21). The first crossbeam (50) and the second crossbeam (60) are provided with wire harnesses, which are respectively connected to the control unit (40) and the first battery pack (20).

4. The power battery pack according to claim 1, characterized in that, Also includes: A heat dissipation element (70) is disposed in the receiving cavity (11). The heat dissipation element (70) is disposed on one side of the first battery pack (20) and the second battery pack (30) and covers the surfaces of the first battery pack (20) and the second battery pack (30) facing the heat dissipation element (70).

5. The power battery pack according to claim 4, characterized in that, The heat dissipation element (70) has an inlet (71) and an outlet (72); The housing (10) has a first hole (12) and a second hole (13). The inlet (71) and the first hole (12) are connected by an inlet pipe, and the outlet (72) and the second hole (13) are connected by an outlet pipe.

6. The power battery pack according to claim 4, characterized in that, Also includes: A fixed bracket (80) is disposed in the receiving cavity (11) and connected to the housing (10). The fixed bracket (80) is disposed on the side of the heat dissipation element (70) facing the housing (10), and the fixed bracket (80) is connected to the heat dissipation element (70).

7. The power battery pack according to claim 1, characterized in that, The housing (10) has an output connector (14) at one end near the second battery pack (30), and the output connector (14) is connected to the second battery pack (30).

8. The power battery pack according to claim 1, characterized in that, Also includes: A temperature detection unit (90) is disposed in the receiving cavity (11) and connected to the control unit (40).

9. A battery system, characterized in that, Includes the power battery pack as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, It includes the battery system of claim 9, or the power battery pack of any one of claims 1 to 8.

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