A battery pack

Abstract

The utility model belongs to battery technical field, especially relates to a battery pack, including box, crossbeam, liquid cooling board, multiple electric core monomer, battery management system and electrical assembly, the crossbeam is arranged in the inside of box, the both ends of liquid cooling board are fixedly connected with crossbeam, and liquid cooling board can be detachably installed in the inside of box, multiple groups electric core monomer are arranged and installed on liquid cooling board, and liquid cooling board is connected pipeline and inlet and outlet water port in proper order, electrical assembly is arranged in the inside of box, and electrical assembly is used for controlling the charge -discharge process of battery pack, battery management system is connected with electrical assembly and electric core monomer, and battery management system is used for detecting the voltage, temperature and charge state of multiple electric core monomers, and manages the charge -discharge process, cancels the existence of longitudinal beam, and crossbeam and liquid cooling board are integral simultaneously, can improve the structural layout inside battery pack, enhances the anti -shock performance and structural strength of whole, improves the security of battery.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle market, the battery pack has become an indispensable key component. Today, the battery pack is cleverly integrated into the vehicle's chassis, serving as the core power source for new energy vehicles, continuously providing the necessary driving electrical energy. The battery pack has a sophisticated internal structure, composed of numerous battery cells connected in precise series, parallel, or series-parallel configurations to form highly efficient battery modules. These modules, combined with key components such as the battery management system, constitute a complete battery pack system. The main function of the battery pack is to store and release electrical energy, providing stable power support when the vehicle needs it, ensuring smooth vehicle operation. Simultaneously, the battery pack also incorporates a series of safety measures to protect the battery and its internal electronic components from damage, ensuring safe and stable battery operation.

[0003] In existing technologies, battery packs often incorporate longitudinal beams in addition to crossbeams for supporting and securing the cells. These longitudinal beams, acting as structural supports, significantly increase the overall weight of the battery pack. They not only occupy internal space but also restrict the arrangement and layout of the cells, making it difficult to increase the energy density within the battery pack and consequently affecting the overall vehicle performance. Cell assembly requires coordination with the longitudinal beams, increasing the complexity and difficulty of the assembly process. These complex assembly steps not only reduce production efficiency but also increase the risk of assembly errors and raise the material and manufacturing costs of the battery pack. Furthermore, the increased assembly complexity may also lead to higher production costs. Utility Model Content

[0004] To address the aforementioned issues, this utility model proposes a battery pack, comprising a housing, a crossbeam, a liquid cooling plate, multiple individual battery cells, a battery management system, and electrical components.

[0005] The crossbeam is arranged inside the box; both ends of the liquid cooling plate are fixedly connected to the crossbeam, and the liquid cooling plate can be detachably installed inside the box.

[0006] Multiple sets of the aforementioned battery cells are arranged and installed on a liquid cooling plate; the liquid cooling plate, pipelines, and inlet / outlet ports are connected in sequence;

[0007] The electrical components are located inside the enclosure and are used to control the charging and discharging process of the battery pack.

[0008] The battery management system connects to the electrical components and individual battery cells; the battery management system is used to detect the voltage, temperature and charge status of multiple individual battery cells, and manage the charging and discharging process controlled by the electrical components.

[0009] Furthermore, the electrical components include a BDU, a high-voltage plug-in, a low-voltage plug-in, a fuse, and a smoke sensor; the BDU, fuse, and smoke sensor are installed inside the enclosure; the input terminal of the BDU is connected to a single battery cell, and the output terminal of the BDU is connected to the high-voltage plug-in; the high-voltage plug-in is installed on the side wall of the enclosure; the low-voltage plug-in is installed inside the enclosure and is connected to the battery management system.

[0010] Furthermore, pressure strips are arranged on the surface of the liquid cooling plate, and thermally conductive structural adhesive is applied to the surface of the liquid cooling plate; multiple individual battery cells are assembled into a battery cell module; multiple battery cell modules are fixed to the liquid cooling plate by thermally conductive structural adhesive.

[0011] Furthermore, an integrated cover plate is fixed to the surface of the battery cell module; the integrated cover plate includes a tray, electrode sheets, and an FPC; the battery cell is fixed on the tray; the tray is fixedly connected to the liquid cooling plate; the electrode sheets are integrated on the tray and fixed to the battery cell; the FPC is fixedly connected to the tray, and the voltage and temperature of the battery cell are collected through the FPC.

[0012] Furthermore, the battery management system includes a slave module and an integrated module; the integrated module is connected to the FPC; the slave module is connected to both the FPC and the integrated module; and the low-voltage plug-in is connected to both the integrated module and the slave module.

[0013] Furthermore, foam is arranged in the middle of the housing, and the foam is in contact with the liquid cooling plate.

[0014] Furthermore, a copper busbar is provided between each group of battery cell modules, and the copper busbar is connected to the BDU.

[0015] Furthermore, a heating film is installed between each two adjacent battery cell modules.

[0016] Furthermore, end plates are fixedly connected to both ends of the battery cell module.

[0017] Furthermore, the enclosure is made of aluminum alloy.

[0018] Beneficial effects

[0019] The advantages of this utility model over the prior art are as follows:

[0020] 1. This application eliminates the longitudinal beams, while the crossbeams and liquid cooling plates are integrated; this can improve the internal structural layout of the battery pack, enhance the overall seismic performance and structural strength, and improve battery safety.

[0021] 2. In this application, the slave module collects the temperature and voltage data of the battery cell via FPC, and then transmits the collected information to the integrated module via daisy-chain communication. The integrated module uses this information to monitor the battery status in real time, preventing abnormal situations and thus protecting battery safety.

[0022] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the overall structure of the liquid cooling plate and other components in an embodiment of this utility model is shown.

[0025] Figure 2 A schematic diagram of the overall structure of the battery cell and integrated cover plate in an embodiment of this utility model is shown.

[0026] Figure 3 A schematic diagram of the internal structure of the box in an embodiment of this utility model is shown.

[0027] In the diagram, 1. Housing; 2. Crossbeam; 3. Liquid cooling plate; 4. Individual battery cell; 31. Piping; 32. Inlet / outlet; 5. BDU; 6. High-voltage connector; 7. Low-voltage connector; 8. Fuse; 9. Thermally conductive adhesive; 10. Tray; 11. Electrode; 12. FPC; 13. Slave module; 14. Integrated module; 15. Smoke sensor; 16. Foam; 17. Copper busbar; 18. Heating film; 19. End plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] This application provides a battery pack, referenced... Figure 1 and Figure 3 It includes a housing 1, a crossbeam 2, a liquid cooling plate 3, multiple individual battery cells 4, a battery management system, and electrical components;

[0030] The crossbeam 2 is arranged inside the housing 1; the two ends of the liquid cooling plate 3 are fixedly connected to the crossbeam 2, and the liquid cooling plate 3 can be detachably installed inside the housing 1.

[0031] Multiple sets of the battery cells 4 are arranged and installed on the liquid cooling plate 3; the liquid cooling plate 3, the pipe 31 and the inlet and outlet 32 ​​are connected in sequence;

[0032] The electrical components are arranged inside the housing 1 and are used to control the charging and discharging process of the battery pack.

[0033] The battery management system is connected to the electrical components and individual battery cells 4; the battery management system is used to detect the voltage, temperature and charge status of multiple individual battery cells 4, and to manage the electrical components to control the charging and discharging process of the battery pack.

[0034] Battery packs have become a crucial component of new energy vehicles, making their internal structure increasingly important. Current battery packs typically employ longitudinal and transverse beams to secure and support the battery cells. However, these beams can introduce various challenges and inconveniences. Eliminating the longitudinal beams can increase the flexibility of battery module placement, improve energy density, or optimize the battery pack structure. It also allows for more flexible arrangement and combination of battery modules to adapt to the design requirements of different vehicle models, thereby better utilizing space and increasing the battery pack's energy storage capacity. With increasing concerns about range anxiety, many people desire to travel without worrying about distance. Therefore, eliminating the longitudinal beams reduces the number of battery pack components and their weight, further reducing the overall vehicle weight and increasing driving range.

[0035] The crossbeam 2 is an integrated reinforcing rib structure formed inside the housing 1. Optimizing the geometry of the housing 1 and the crossbeam 2 improves the overall strength and rigidity of the battery pack. The two ends of the liquid cooling plate 3 are welded to the crossbeam 2, and then bolted to the housing 1. The liquid cooling plate 3 connects to the outside of the housing 1 via pipes 31 and inlet / outlet ports 32, enabling the cooling of the individual battery cells 4. The coordination between various electrical components within the electrical system enables the charging and discharging of the battery pack. Simultaneously, it provides timely alarms and disconnection in case of battery pack failure, thus protecting the battery pack. The integrated liquid cooling plate 3, through its built-in cooling pipes 31 and fluid circulation system, effectively reduces the battery's operating temperature and improves the performance of the system's thermal piping 31. It can also serve as a base or outer shell for the battery pack, providing structural support and protection for individual battery cells or modules.

[0036] This application employs a cell-to-pack (CTP) design, which eliminates the traditional module structure and directly places the individual cells 4 into the battery pack to form the entire battery system. This allows for flexible space utilization, reduces the number of internal connectors in the battery system, and improves the system's energy density and overall performance. Furthermore, this design also helps simplify the battery assembly process and improve production efficiency.

[0037] Eliminating longitudinal beams and adopting a module-less design allows for more uniform and efficient use of the internal space of the battery pack, increasing the capacity of battery cells and improving the energy density of the battery pack. Simultaneously, it reduces the overall weight and material costs of the battery pack, simplifies the manufacturing process, reduces production steps and complexity, and lowers manufacturing costs. It also reduces energy loss caused by contact between beams and battery cells, improving the overall energy efficiency of the battery pack. The module-less design also simplifies the design, reducing potential failure points in the battery system, such as connectors and support structures, thereby improving the reliability and safety of the battery system. Furthermore, reducing the number of components and interfaces also helps to reduce the risk of electrical failures.

[0038] This application eliminates the longitudinal beams, while the crossbeam 2 and liquid cooling plate 3 are integrated. This improves the internal structural layout of the battery pack, enhances overall seismic resistance and structural strength, and improves battery safety.

[0039] In one embodiment of this utility model, reference is made to... Figure 3 The electrical components include a BDU5 (Battery Disconnect Unit), a high-voltage connector 6, a low-voltage connector 7, a fuse 8, and a smoke sensor 15. The BDU5, fuse 8, and smoke sensor 15 are installed inside the housing 1. The input terminal of the BDU5 is connected to the individual battery cell 4, and the output terminal of the BDU5 is connected to the high-voltage connector 6. The high-voltage connector 6 is installed on the side wall of the housing 1. The low-voltage connector 7 is installed inside the housing 1 and is connected to the battery management system.

[0040] When charging the battery pack, the Battery Management System (BMS) first detects the voltage, temperature, and state of charge of each individual battery cell to determine if they are in a safe charging state. Typically, constant current charging is used initially at the high-voltage connector 6, gradually switching to constant voltage charging via the low-voltage connector 7 as the battery voltage increases. When the battery pack reaches the required state of charge, the BMS stops charging and notifies external devices of the completion via indicator lights or a communication interface. In summary, the entire charging and discharging process is monitored, controlled, and managed by the BMS to ensure safe and efficient charging and discharging of the battery pack.

[0041] In one embodiment of this utility model, reference is made to... Figure 1The surface of the liquid cooling plate 3 is provided with pressure strips, and the surface of the liquid cooling plate 3 is coated with thermally conductive structural adhesive 9; multiple battery cells 4 are assembled into battery cell modules; multiple battery cell modules are fixed on the liquid cooling plate 3 by thermally conductive structural adhesive 9.

[0042] A pressure strip is installed on the upper surface of the liquid cooling plate 3 to increase the contact area between the liquid cooling plate 3 and the battery cell module; and a thermally conductive structural adhesive 9 is coated on the surface of the liquid cooling plate 3 to fix the battery cell module to the liquid cooling plate 3; end plates 19 are used at both ends of the battery cell module to fix and support the individual battery cells 4; this application does not have longitudinal beams, making the battery cell module more compact and more convenient and safer in terms of maintenance and repair.

[0043] In one embodiment of this utility model, reference is made to... Figure 2 An integrated cover plate is fixed to the surface of the battery cell module; the integrated cover plate includes a tray 10, an electrode 11, and an FPC 12 (Flexible Printed Circuit Board); the battery cell 4 is fixed on the tray 10; the tray 10 is fixedly connected to the liquid cooling plate 3; the electrode 11 is integrated on the tray 10 and fixed to the battery cell 4; the FPC 12 is fixedly connected to the tray 10, and the voltage and temperature of the battery cell 4 are collected through the FPC 12.

[0044] The electrode 11 is soldered to the battery cell via the tray 10, and the pins on the FPC 12 are then soldered to the tray 10, enabling the FPC 12 to collect the battery cell voltage and temperature. An integrated FPC 12 is used. The FPC 12 can be used as a connection line for sensors or controllers, enabling intelligent monitoring and control of the cooling system. It can also be used as a connection line between battery cells, enhancing the overall structural stability. Both have good flexibility and adaptability, allowing for customized design based on the space constraints and layout requirements of the battery system, thereby maximizing the system's space utilization and improving the overall performance and efficiency of the vehicle. This effectively reduces the weight of the battery system, lowers the overall vehicle weight, and improves energy efficiency and driving range.

[0045] In one embodiment of this utility model, reference is made to... Figure 2 and Figure 3 The battery management system includes a slave module 13 and an integrated module 14; the integrated module 14 is connected to the FPC 12; the slave module 13 is connected to both the FPC 12 and the integrated module 14; and the low-voltage plug-in 7 is connected to both the integrated module 14 and the slave module 13.

[0046] Slave module 13 is connected via a wiring harness ( Figure 3In section a), FPC12 collects the temperature and voltage of the battery cells, and then transmits the collected information to the integrated module 14 via daisy-chain communication. The integrated module 14 monitors the battery status in real time based on this information to prevent abnormal situations and protect battery safety. In the event of thermal runaway and fire in the battery pack, the smoke sensor 15 can issue a timely warning, allowing personnel to evacuate promptly and ensuring personal safety. This strengthens the battery pack's thermal management system, ensuring that the battery remains within a safe range under various operating conditions and preventing structural deformation and damage due to overheating.

[0047] In one embodiment of this utility model, foam 16 is arranged in the middle of the box 1, and foam 16 is in contact with liquid cooling plate 3.

[0048] A lot of foam 16 is arranged in the center of the housing 1 to play a role in vibration prevention and cushioning, and to protect the battery cell 4 during use.

[0049] In one embodiment of this utility model, reference is made to... Figure 3 Each group of battery cell modules is provided with a copper busbar 17, which is connected to BDU5.

[0050] By setting up copper busbar 17, the overall strength between the battery cell modules can be increased; copper busbar 17 connects to the terminals of the battery cell modules and collects current to the high-voltage output terminal of BDU5.

[0051] In one embodiment of this utility model, reference is made to... Figure 1 A heating film 18 is provided between each two adjacent battery cell modules.

[0052] A heating film 18 is attached between the two battery cell modules to make the battery cell modules heat up more evenly.

[0053] In one embodiment of this utility model, reference is made to... Figure 2 The two ends of the battery cell module are fixedly connected to end plates 19.

[0054] A battery cell module composed of multiple individual battery cells 4 is fixed and supported at both ends by end plates 19 to improve the stability of the battery cell module; a crossbeam 2 and end plates 19 are added inside the battery pack to disperse stress and improve structural rigidity, thus modularizing the battery pack; the battery pack is integrated with the vehicle chassis design, making the battery pack part of the vehicle structure, thereby improving additional support and rigidity.

[0055] In one embodiment of this utility model, the housing 1 is made of aluminum alloy.

[0056] By using high-strength aluminum alloy to manufacture the battery pack casing, i.e., the housing 1, the rigidity and impact resistance of the battery pack structure are improved.

[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that, Includes housing (1), crossbeam (2), liquid cooling plate (3), multiple battery cells (4), battery management system and electrical components; The crossbeam (2) is arranged inside the box (1); the two ends of the liquid cooling plate (3) are fixedly connected to the crossbeam (2), and the liquid cooling plate (3) can be detachably installed inside the box (1); Multiple sets of the battery cells (4) are arranged and installed on the liquid cooling plate (3); the liquid cooling plate (3), the pipeline (31) and the inlet and outlet (32) are connected in sequence; Electrical components are arranged inside the housing (1) and are used to control the charging and discharging process of the battery pack; The battery management system is connected to the electrical components and individual cells (4); the battery management system is used to detect the voltage, temperature and charge status of multiple individual cells (4) and manage the charging and discharging process controlled by the electrical components.

2. The battery pack according to claim 1, characterized in that, The electrical components include a BDU (5), a high-voltage plug-in (6), a low-voltage plug-in (7), a fuse (8), and a smoke sensor (15); the BDU (5), the fuse (8), and the smoke sensor (15) are installed inside the housing (1), the input end of the BDU (5) is connected to the battery cell (4), and the output end of the BDU (5) is connected to the high-voltage plug-in (6); the high-voltage plug-in (6) is installed on the side wall of the housing (1); the low-voltage plug-in (7) is installed inside the housing (1) and is connected to the battery management system.

3. A battery pack according to claim 2, characterized in that, The surface of the liquid cooling plate (3) is provided with pressure strips, and the surface of the liquid cooling plate (3) is coated with thermally conductive structural adhesive (9); multiple battery cells (4) are assembled into a battery cell module; Multiple battery cell modules are fixed to the liquid cooling plate (3) by thermally conductive structural adhesive (9).

4. A battery pack according to claim 3, characterized in that, The surface of the battery cell module is fixed with an integrated cover plate; the integrated cover plate includes a tray (10), an electrode (11) and an FPC (12); the battery cell (4) is fixed on the tray (10); the tray (10) is fixedly connected to the liquid cooling plate (3); the electrode (11) is integrated on the tray (10) and fixed to the battery cell (4); the FPC (12) is fixedly connected to the tray (10), and the voltage and temperature of the battery cell (4) are collected through the FPC (12).

5. A battery pack according to claim 4, characterized in that, The battery management system includes a slave module (13) and an integrated module (14); the integrated module (14) is connected to the FPC (12); the slave module (13) is connected to the FPC (12) and the integrated module (14); and the low-voltage plug-in (7) is connected to the integrated module (14) and the slave module (13).

6. A battery pack according to claim 5, characterized in that, Foam (16) is arranged in the middle of the box (1), and the foam (16) is in contact with the liquid cooling plate (3).

7. A battery pack according to claim 6, characterized in that, A copper busbar (17) is provided between each group of battery cell modules, and the copper busbar (17) is connected to the BDU (5).

8. A battery pack according to claim 3, characterized in that, A heating film (18) is provided between each two adjacent battery cell modules.

9. A battery pack according to claim 3, characterized in that, The two ends of the battery cell module are fixedly connected to end plates (19).

10. A battery pack according to claim 1, characterized in that, The enclosure (1) is made of aluminum alloy.

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