Battery pack with liquid cooling structure

Abstract

The utility model provides a battery pack with a liquid cooling structure, belonging to the technical field of battery packs, the battery pack with the liquid cooling structure comprises a box body, an explosion-proof valve, a water cooling system and an electrical component, the box body comprises an upper part and a lower part, the lower part of the box body is provided with a front panel and a rear panel, the front panel is arranged on the front wall of the box body, and the rear panel is arranged on the rear wall of the box body. The rear panel is arranged on the rear wall of the box body, the front panel is provided with a water cooling system and an electrical assembly, the water cooling system is bonded on the box body, the front wall of the upper part of the box body is provided with an anti-explosion valve, and the anti-explosion valve is fixed on the box body through a thread structure; the box body is further provided with an upper cover and a bottom frame, the upper cover is arranged on the outer side of the upper portion of the box body in a sleeving mode and used for protection, the bottom frame is used for bearing, the bottom frame comprises a tray, the tray is located on the lower portion of the box body, the problems that a traditional battery pack is too large in overall weight and low in structural strength are solved, and the structural strength is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and in particular relates to a battery pack with a liquid cooling structure. Background Art

[0002] As one of the core components of new energy vehicles, the battery pack carries the key functions of storing and releasing electrical energy. Its performance directly affects the vehicle's range, safety and stability. With the rapid expansion of the electric vehicle market, higher requirements are placed on the energy density, safety performance, thermal management capabilities and structural design of the battery pack. Traditional battery packs usually use air cooling or a simple liquid cooling system to cope with the large amount of heat energy generated when the battery is working, to prevent performance degradation or safety hazards caused by overheating. The battery pack consists of multiple battery modules, each of which contains dozens or even hundreds of cells, which are connected in series or parallel to form a high-voltage, large-capacity energy system that can meet the vehicle's power requirements. The design of the battery pack must not only consider the efficient operation of the electrochemical system, but also take into account mechanical strength, thermal management, electrical safety and maintenance convenience.

[0003] However, the disadvantages of traditional battery packs include the following: Traditional battery packs are limited by heavy structural materials and simple cooling designs, resulting in bulky packs and increased energy consumption. At the same time, the fragile support frame and the lack of efficient thermal management mechanism affect safety performance and service life. In terms of structural strength, early battery pack designs often focused on ensuring basic safety protection, while ignoring the balance between lightweight and strength. In the event of a collision or bumpy road conditions, the structurally weak battery pack is prone to deformation or even damage, which not only threatens the safety of passengers, but may also cause serious consequences such as thermal runaway of the battery. In order to ensure the structural stability and protection level of the battery pack, traditional designs often use thick outer shell materials and complex internal support structures, which not only increases the total weight of the battery pack and reduces energy utilization efficiency, but may also take up valuable space in the vehicle. Utility Model Content

[0004] In view of this, the utility model provides a battery pack with a liquid cooling structure, which solves the problems of excessive overall weight and low structural strength of traditional battery packs, and improves the reliability and safety of the structure.

[0005] The utility model is achieved in this way:

[0006] The utility model provides a battery pack with a liquid cooling structure, which includes a box body, an explosion-proof valve, a water cooling system, and an electrical component. The box body includes an upper part and a lower part. The lower part of the box body is provided with a front panel and a rear panel. The front panel is provided on the front wall of the box body, and the rear panel is provided on the rear wall of the box body. The front panel is provided with a water cooling system and an electrical component. The water cooling system is bonded to the box body. The upper front wall of the box body is provided with an explosion-proof valve, and the explosion-proof valve is fixed to the box body through a threaded structure.

[0007] The box body is also provided with an upper cover and a bottom frame. The upper cover is sleeved on the outer side of the upper part of the box body for protection, and the bottom frame is used for bearing weight.

[0008] The technical effects of a battery pack with a liquid cooling structure provided by the utility model are as follows: Beneficial effects of the box structure and explosion-proof design:

[0009] Enhanced structural stability: Reasonable box structure design improves overall load-bearing capacity and impact resistance.

[0010] Optimize space layout: Improve the compactness of battery modules and increase vehicle range or cargo space.

[0011] Explosion-proof protection: prevents external liquid intrusion and abnormal internal pressure, ensuring safety in extreme situations.

[0012] On the basis of the above technical solution, the battery pack with a liquid cooling structure of the utility model can also be improved as follows:

[0013] Among them, the base frame includes a tray, which is located at the lower part of the box body, and the tray is provided with rivet nuts for fixing the front panel and the rear panel. A plurality of module fixing blocks are provided at the bottom of the tray, and reinforcing rib plates are provided on the left and right side walls of the tray. The bottom connecting plate of the reinforcing rib plate is provided with lifting holes and mounting holes, and box rocker plates are provided at both ends of the bottom connecting plate of the reinforcing rib plate.

[0014] Furthermore, a plurality of the reinforcing ribs are arranged in an array on the left and right side walls of the tray, and the reinforcing ribs are symmetrically distributed about the center of the box body.

[0015] Furthermore, the hoisting holes and the mounting holes are arranged in combination, and each group of the hoisting holes and the mounting holes is arranged at intervals at the bottom connecting plate of the reinforcing rib plate.

[0016] Furthermore, the water cooling system consists of a water cooling plate and a pipe interface, the water cooling plate is mounted and fixed on the base frame, and the pipe interface extends out through the base frame quick-connect connector.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: Beneficial effects of water cooling system:

[0018] Efficient heat dissipation: Directly cool the battery module, improve heat exchange efficiency, reduce heat accumulation, ensure battery performance and extend service life.

[0019] Temperature uniformity: Through the precisely designed water cooling pipe layout, the temperature difference between battery modules is ensured to be small, improving the working consistency of the entire battery pack.

[0020] Furthermore, an opening is provided at the front wall of the upper cover, and the opening is used to match the thread of the explosion-proof valve and be fixed by a nut.

[0021] Furthermore, the reinforcing rib plate, the box rocker plate, the module fixing block and the tray are fixed by welding.

[0022] Furthermore, the upper part of the box body and the lower part of the box body are fixed by screws.

[0023] Furthermore, the electrical components include a positive electrode integrated connector, an MSD, a negative electrode integrated connector, and a BMU.

[0024] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The beneficial effects of optimizing the electrical components are:

[0025] Improve reliability: Integrated design reduces electrical connection points, reduces failure rate, and improves system stability.

[0026] Easy maintenance: troubleshooting and replacement are more convenient and quick, reducing maintenance costs.

[0027] Electrical safety: The integrated design optimizes wiring harness management, reduces the risk of short circuits, and improves overall electrical safety.

[0028] Furthermore, the positive electrode integrated connector, the low voltage communication connector socket and the connecting harness, and the heating connector socket and the connecting harness in the negative electrode integrated connector are integrated into a whole.

[0029] Compared with the prior art, the battery pack with a liquid cooling structure provided by the utility model has the following beneficial effects:

[0030] High-efficiency liquid cooling system: The water cooling system in this design directly acts on the battery module. Through the precisely designed liquid cooling pipes and high-efficiency heat exchangers, the heat energy generated by the battery during operation can be quickly extracted. Even in high-power charging and discharging scenarios, the battery temperature can be effectively controlled, extending the battery life and improving battery performance and safety.

[0031] Integrated electrical design: The optimized integration of electrical components such as the positive and negative integrated connectors, MSD (manual maintenance switch), and BMU (battery management system unit) reduces the number of connection points, simplifies the wiring harness layout, and improves the reliability of electrical connections and the convenience of maintenance. The integrated design not only reduces weight, but also enhances electrical safety and reduces the risk caused by line failures;

[0032] Strengthened structure and explosion-proof design: The box structure adopts lightweight structural design and reinforcement design, such as the reasonable configuration of reinforcing ribs and module fixing blocks, which not only ensures the overall mechanical strength but also reduces the weight. The setting of the explosion-proof valve effectively prevents the intrusion of liquid from the external environment, and can quickly release pressure under abnormal pressure to prevent explosion accidents, thereby improving the safety level of the battery pack; Optimize space utilization: The sophisticated design of the chassis, such as the layout of the tray, lifting holes, and mounting holes, combined with the integration of the electrical installation panel, not only improves the load-bearing and fixing capacity of the battery pack, but also optimizes the internal space, creating conditions for the compact arrangement of the battery module, and indirectly increasing the vehicle's payload or range. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is an example diagram of a battery pack with a liquid cooling structure;

[0035] Figure 2 This is an example diagram of the front wall of a battery pack with a liquid cooling structure;

[0036] Figure 3 This is an example diagram of the rear wall of a battery pack with a liquid cooling structure;

[0037] Figure 4 This is an example diagram of the lower part of a battery pack with a liquid cooling structure;

[0038] Figure 5 This is an example diagram of the upper part of a battery pack with a liquid cooling structure;

[0039] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0040] 10. Box body; 11. Front panel; 12. Rear panel; 13. Upper cover; 14. Base frame; 141. Tray; 142. Lifting hole; 143. Mounting hole; 144. Reinforcement rib plate; 145. Box rocker; 146. Module fixing block; 20. Explosion-proof valve; 30. Water cooling system; 40. Electrical components. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the implementation mode of the present invention clearer, the technical solution in the implementation mode of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the implementation mode of the present invention.

[0042] like Figure 1 , Figure 2 , Figure 3 , which is an example diagram of a first embodiment of a battery pack with a liquid cooling structure provided by the utility model. In this embodiment, the battery pack includes a box body 10, an explosion-proof valve 20, a water cooling system 30, and an electrical component 40. The box body 10 includes an upper part and a lower part. The lower part of the box body 10 is provided with a front panel 11 and a rear panel 12. The front panel 11 is arranged on the front wall of the box body 10, and the rear panel 12 is arranged on the rear wall of the box body 10. The front panel 11 is provided with a water cooling system 30 and an electrical component 40. The water cooling system 30 is bonded to the box body 10. The upper front wall of the box body 10 is provided with an explosion-proof valve 20, and the explosion-proof valve 20 is fixed to the box body 10 through a threaded structure.

[0043] The box body 10 is further provided with an upper cover 13 and a bottom frame 14. The upper cover 13 is sleeved on the outer side of the upper part of the box body 10 for protection, and the bottom frame 14 is used for bearing weight.

[0044] When in use, the base frame is made of high-strength material and is designed with a reinforcing rib structure and module fixing blocks to ensure that the module is firmly installed.

[0045] Specifically, high-strength materials can include the following categories:

[0046] Low-alloy high-strength structural steel: such as Q235, Q345, Q390, Q420, etc. These steels significantly improve the yield strength and tensile strength of the steel without significantly increasing the cost by adding trace alloy elements (such as manganese, silicon, chromium, nickel, etc.), while maintaining good toughness and welding performance. They are suitable for manufacturing chassis structures that need to withstand large loads.

[0047] Aluminum alloy materials: such as 6061-T6 and 7075-T6 aluminum alloys, which have the characteristics of low density, high strength and good corrosion resistance, are particularly suitable for chassis that require lightweight design, and are commonly found in high-end vehicles and aviation fields. Aluminum alloy chassis can effectively reduce the overall weight and improve the energy efficiency of the vehicle.

[0048] Composite materials: including carbon fiber reinforced plastic (CFRP) and glass fiber reinforced plastic (GFRP), which have extremely high strength-to-weight ratios, corrosion resistance, and design flexibility.

[0049] The explosion-proof valve is installed at a position on the top or side of the box where exhaust is easy to occur. According to the exhaust volume and exhaust rate of the battery cell and the box space, select an explosion-proof valve suitable for the pressure threshold to ensure a rapid response when the pressure is abnormal.

[0050] The upper cover, front and rear panels are designed with sealing strips, which are used together with fasteners to ensure the sealing performance of the entire box.

[0051] like Figure 4 As shown, in the above technical solution, the base frame 14 includes a tray 141, the tray 141 is located at the lower part of the box body 10, the tray 141 is provided with rivet nuts for fixing the front panel 11 and the rear panel 12, a plurality of module fixing blocks 146 are provided at the bottom of the tray 141, the left and right side walls of the tray 141 are provided with reinforcing ribs 144, the bottom connecting plate of the reinforcing ribs 144 is provided with lifting holes 142 and installation holes 143, and box rocker plates 145 are provided at both ends of the bottom connecting plate of the reinforcing ribs 144.

[0052] Furthermore, in the above technical solution, a plurality of reinforcing ribs 144 are arranged in an array on the left and right side walls of the tray 141 , and the reinforcing ribs 144 are symmetrically distributed about the center of the box.

[0053] Furthermore, in the above technical solution, the hoisting holes 142 and the mounting holes 143 are arranged in combination, and each group of hoisting holes 142 and mounting holes 143 are arranged at intervals at the bottom connecting plate of the reinforcing rib plate 144 .

[0054] Furthermore, in the above technical solution, the water cooling system 30 is composed of a water cooling plate and a pipe interface. The water cooling plate is installed and fixed on the base frame 14, and the pipe interface extends out through the base frame 14 quick-connect connector.

[0055] When using it, when designing the water cooling pipeline, it is necessary to adopt various layout forms such as serpentine, parallel or series according to the heating characteristics and spatial layout of the battery module to ensure that the coolant flows through each group of battery cells.

[0056] The selection of coolant must take into account thermal conductivity, electrical insulation and chemical stability. It should be checked and replaced regularly to maintain system efficiency.

[0057] like Figure 5 As shown, further, in the above technical solution, an opening is provided at the front wall of the upper cover 13, and the opening is used to match the thread of the explosion-proof valve 20 and is fixed by a nut.

[0058] Furthermore, in the above technical solution, the reinforcing rib plate 144, the box rocker plate 145, the module fixing block 146 and the tray 141 are fixed by welding.

[0059] Furthermore, in the above technical solution, the upper part of the box body 10 and the lower part of the box body 10 are fixed by screws.

[0060] Furthermore, in the above technical solution, the electrical component 40 includes a positive electrode integrated connector, an MSD, a negative electrode integrated connector, and a BMU.

[0061] When in use, key components such as the positive and negative integrated connectors, MSD, BMU, etc. are designed as pluggable modules for quick installation and replacement.

[0062] Positive integrated connector: This is the interface in the battery pack electrical system, responsible for connecting the outputs of all positive cells or modules together to form the positive output of the battery pack.

[0063] MSD (Manual Service Disconnect): MSD is used by maintenance personnel to manually cut off the high voltage power supply of the battery during battery pack maintenance or in an emergency.

[0064] Negative integrated connector: Similar to the positive integrated connector, the negative integrated connector is responsible for connecting all negative battery cells or modules to form the negative circuit of the battery pack. It also integrates a low-voltage communication connector socket and a connecting harness for signal transmission and possible heating functions to ensure that the battery can start and operate normally in a low-temperature environment.

[0065] BMU (Battery Management Unit): BMU is responsible for collecting voltage, current and temperature information of each battery cell, processing these data through complex algorithms to achieve real-time monitoring of battery status, balancing control, fault diagnosis and protection strategy execution.

[0066] The low-voltage communication and heating connector sockets are centrally arranged to reduce the complexity of the wiring harness while ensuring signal transmission quality and heating uniformity.

[0067] Strengthen the waterproof and dustproof design of the electrical connection part to ensure good electrical performance even in harsh environments.

[0068] Furthermore, in the above technical solution, the low-voltage communication connector socket and connecting harness, and the heating connector socket and connecting harness in the positive integrated connector and the negative integrated connector are integrated into a whole.

[0069] Specifically, the principle of the utility model is:

[0070] Liquid cooling circulation mechanism: The coolant driven by the pump circulates in the liquid cooling pipe and directly contacts the surface of the battery module to achieve efficient heat exchange. After the coolant absorbs the heat generated by the battery, it exchanges heat with the external environment through the heat exchanger, dissipates the heat to the atmosphere, and keeps the battery operating within a suitable temperature range;

[0071] Electrical integration and signal processing: As the center of the battery management system, BMU receives the voltage and temperature information of each battery cell, evaluates the battery status through precise algorithms, implements balancing control, and prevents overcharging, over-discharging, and abnormal temperature. The integrated positive and negative connectors and heating components, etc., through optimized design, realize efficient transmission and processing of electrical signals, ensuring the stable operation of the battery system;

[0072] Structural reinforcement and protection: The box design fully considers the mechanical and thermodynamic properties, and uses reinforcing ribs and module fixing blocks to enhance the rigidity and stability of the box. The addition of an explosion-proof valve is an active safety measure to ensure the safe release of pressure in the battery pack under extreme conditions to avoid the risk of explosion.

Claims

1. A battery pack with a liquid cooling structure, characterized in that: The invention comprises a box (10), an explosion-proof valve (20), a water cooling system (30), and an electrical component (40); the box (10) comprises an upper part and a lower part; the lower part of the box (10) is provided with a front panel (11) and a rear panel (12); the front panel (11) is arranged on the front wall of the box (10); the rear panel (12) is arranged on the rear wall of the box (10); the front panel (11) is provided with a water cooling system (30) and an electrical component (40); the water cooling system (30) is bonded to the box (10); the upper front wall of the box (10) is provided with an explosion-proof valve (20); the explosion-proof valve (20) is fixed to the box (10) by a threaded structure; The box body (10) is also provided with an upper cover (13) and a bottom frame (14); the upper cover (13) is sleeved on the outer side of the upper part of the box body (10) for protection, and the bottom frame (14) is used for bearing weight.

2. A battery pack with a liquid cooling structure according to claim 1, characterized in that: The base frame (14) comprises a tray (141), the tray (141) is located at the lower part of the box body (10), the tray (141) is provided with rivet nuts for fixing the front panel (11) and the rear panel (12), a plurality of module fixing blocks (146) are provided at the bottom of the tray (141), the left and right side walls of the tray (141) are provided with reinforcing rib plates (144), the bottom connecting plate of the reinforcing rib plate (144) is provided with a hoisting hole (142) and an installation hole (143), and box rocker plates (145) are provided at both ends of the bottom connecting plate of the reinforcing rib plate (144).

3. A battery pack with a liquid cooling structure according to claim 2, characterized in that: A plurality of the reinforcing rib plates (144) are arranged in an array on the left and right side walls of the tray (141), and the reinforcing rib plates (144) are symmetrically distributed about the center of the box body (10).

4. A battery pack with a liquid cooling structure according to claim 3, characterized in that: The hoisting holes (142) and the mounting holes (143) are arranged in combination, and each group of the hoisting holes (142) and the mounting holes (143) are arranged at intervals at the bottom connecting plate of the reinforcing rib plate (144).

5. A battery pack with a liquid cooling structure according to claim 4, characterized in that: The water cooling system (30) is composed of a water cooling plate and a pipe interface, the water cooling plate is mounted and fixed on the base frame (14), and the pipe interface extends out through a quick-connect connector of the base frame (14).

6. A battery pack with a liquid cooling structure according to claim 5, characterized in that: An opening is provided at the front wall of the upper cover (13), and the opening is used to match the thread of the explosion-proof valve (20) and is fixed by a nut.

7. A battery pack with a liquid cooling structure according to claim 6, characterized in that: The reinforcing rib plate (144), the box rocker plate (145), the module fixing block (146) and the tray (141) are fixed by welding.

8. The battery pack with a liquid cooling structure according to claim 7, characterized in that: The upper part of the box body (10) and the lower part of the box body (10) are fixed by screws.

9. A battery pack with a liquid cooling structure according to claim 8, characterized in that: The electrical component (40) comprises a positive electrode integrated connector, an MSD, a negative electrode integrated connector, and a BMU.

10. A battery pack with a liquid cooling structure according to claim 9, characterized in that: The positive electrode integrated connector, the low voltage communication connector socket and the connecting wire harness, and the heating connector socket and the connecting wire harness in the negative electrode integrated connector are integrated into a whole.

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