High-efficiency heat-conducting structure of high-voltage pack

Abstract

The efficient heat conduction structure comprises a lower cover plate, an upper cover plate, a battery core bag arranged between the lower cover plate and the upper cover plate, a welding layer arranged on the upper cover plate and connected with the battery core bag, an insulating heat conduction layer tightly attached to the welding layer, and a heat exchange structure connected to the insulating heat conduction layer, the insulating heat-conducting layer is provided with a plurality of positioning grooves, the upper cover plate is provided with mounting bumps corresponding to the positioning grooves, and the positioning grooves sleeve the mounting bumps, so that the mounting of the insulating heat-conducting layer on the upper cover plate is realized; the heat exchange structure is connected with the upper cover plate and clamps the welding layer and the insulating heat conduction layer. According to the utility model, the problem of heat exchange of the traditional high-voltage pack is solved, the overall safety, reliability and usability are improved, and the high-voltage pack heat exchange device is suitable for wide application scenes of the high-voltage pack.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of battery safety, especially relates to a high-voltage battery pack efficient heat conduction structure. BACKGROUND

[0002] High-voltage battery pack refers to an energy storage system composed of multiple high-voltage battery units (such as lithium-ion batteries) in series or parallel connection, widely used in electric vehicles, hybrid electric vehicles, energy storage power stations and other occasions requiring high power and high energy density. These battery packs usually work at a high voltage level (for example, 300V to 800V) to meet the needs of vehicle acceleration performance, range and fast charging. With the rapid growth of the new energy vehicle market and technological progress, higher requirements are placed on the safety, reliability and efficiency of high-voltage battery packs.

[0003] However, in practical applications, existing high-voltage battery packs face many challenges, especially in terms of heat exchange management and space utilization:

[0004] Poor heat dissipation due to dense arrangement: As a special-purpose power source, high-voltage battery packs are often limited by available space, and their layout in the battery box of the carrier is very compact. This high-density arrangement results in small spacing between each battery module, hindering air circulation and greatly affecting the effectiveness of natural cooling. Heat is difficult to dissipate effectively, and is easily accumulated in local areas, causing high temperatures.

[0005] High temperature in the charging and discharging process shortens the life: Battery modules generate a large amount of heat during charging and discharging. When the temperature rises to a certain level, not only will the efficiency of the battery be reduced, but also the internal materials will be accelerated, thereby shortening the service life of the entire battery module. Long-term operation in a high-temperature environment may even lead to the risk of thermal runaway, threatening the safety and stability of the system.

[0006] Limitations of traditional heat dissipation solutions: One of the main methods currently used to solve the problem of high temperature in battery modules is to use air cooling. Although the air cooling system is simple in structure and low in cost, its heat dissipation efficiency is relatively limited, and the fan and other equipment itself also occupies additional space resources. In addition, as the use time increases, the fan may fail or accumulate dust, further weakening the heat dissipation capacity. More importantly, in some closed design application scenarios, air cooling cannot achieve the ideal cooling effect.

[0007] Furthermore, in order to ensure the optimal operating temperature of the battery pack, heating is also required in special cases. The existing equipment cannot quickly and uniformly heat and maintain. INVENTION CONTENTS

[0008] The purpose of this invention is to provide a high-efficiency heat-conducting structure for high-voltage battery packs, so as to solve the technical problem of heat exchange in high-voltage battery packs within a limited space.

[0009] To achieve the above objectives, the specific technical solution of this utility model for a high-voltage electric pack with efficient heat conduction is as follows:

[0010] A high-voltage battery pack with efficient heat conduction structure includes a lower cover plate and an upper cover plate, a battery pack disposed between the lower cover plate and the upper cover plate, a welding layer disposed on the upper cover plate to connect the battery pack, an insulating and heat-conducting layer in close contact with the welding layer, and a heat exchange structure connected to the insulating and heat-conducting layer.

[0011] The insulating and heat-conducting layer is provided with a plurality of positioning grooves, and the upper cover plate is provided with mounting protrusions corresponding to the positioning grooves. The positioning grooves are fitted onto the mounting protrusions to realize the installation of the insulating and heat-conducting layer on the upper cover plate.

[0012] The heat exchange structure is connected to the upper cover plate, clamping the welding layer and the insulating heat-conducting layer.

[0013] As a further improvement of this utility model, the battery cell package includes a plurality of battery cell groups, the battery cell group includes a plurality of battery cells, and the welding layer includes welding nickel sheets corresponding to the battery cell groups.

[0014] As a further improvement of this utility model, the upper cover plate is recessed and has several mounting grooves, and the welding nickel sheet enters the mounting grooves to connect with the battery cell assembly.

[0015] As a further improvement of this utility model, a terminal is provided on one side of the welded nickel sheet, which is bent and protrudes from the side of the upper cover plate through the mounting groove for connection to external circuits.

[0016] As a further improvement of this utility model, the heat exchange structure is provided with a heat exchange through hole corresponding to the mounting protrusion, and the mounting protrusion is provided with a mounting hole. The heat exchange structure is installed on the upper cover plate by passing a bolt through the heat exchange through hole and into the mounting hole.

[0017] As a further improvement of this utility model, a welding hole is provided in the mounting groove, and the welding hole is correspondingly provided with the battery cell to realize the connection between the welding nickel sheet and the battery cell assembly.

[0018] As a further improvement of this utility model, the insulating and thermally conductive layer is thermally conductive silicone.

[0019] As a further improvement of this utility model, the heat exchange structure adopts liquid heat exchange and is provided with a liquid inlet and a liquid outlet. The liquid inlet allows external heat exchange liquid to enter the heat exchange structure and flow, and after heat exchange, it is discharged through the liquid outlet.

[0020] Beneficial effects:

[0021] This invention, by incorporating an insulating and thermally conductive layer and a heat exchange structure, effectively conducts heat generated within the battery pack and rapidly dissipates it through the heat exchange structure, ensuring the uniformity and stability of the internal temperature of the battery pack. In particular, the use of thermally conductive silicone as the insulating and thermally conductive layer not only guarantees excellent thermal conductivity but also provides necessary electrical isolation to prevent short-circuit risks.

[0022] The clamping design between the heat exchange structure and the upper cover plate ensures that the welding layer and the insulating heat-conducting layer will not shift due to vibration or other external forces, thus enhancing the overall safety of the structure.

[0023] The positioning grooves on the insulating and thermally conductive layer cooperate with the mounting protrusions on the top cover plate, achieving a precise and stable installation method and avoiding the loosening problems that may occur with traditional adhesive or snap-fit ​​connections. This design simplifies the assembly process and improves product reliability.

[0024] The design of the welded nickel sheet and its connection method with the battery pack (including insertion into the recessed mounting groove in the upper cover and a secure connection through welding holes) ensures a low-resistance electrical path, reduces energy loss, and improves overall efficiency. Furthermore, the wiring terminals with bends on the sides of the welded nickel sheet provide convenient connection points for the data acquisition lines, facilitating monitoring and maintenance.

[0025] By setting the heat exchange through holes at positions corresponding to the mounting protrusions and fixing the heat exchange structure with bolts, the entire system can achieve efficient heat exchange within a limited space, meeting the requirements of modern battery packs for compact design.

[0026] The rational layout and modular design make the structure easy to manufacture and assemble, reducing manufacturing costs. Moreover, the independence and disassembly of each component greatly simplify the operation process when maintenance or replacement is required. Attached Figure Description

[0027] Fig. 1 This is a schematic diagram of a high-voltage electric module with high-efficiency heat conduction structure according to the present invention;

[0028] Fig. 2 This is a schematic diagram of the upper cover plate structure;

[0029] The markings in the diagram are as follows: 1. Lower cover plate; 2. Battery cell pack; 3. Upper cover plate; 31. Mounting protrusion; 311. Mounting hole; 32. Mounting groove; 321. Welding hole; 4. Welding layer; 41. Welding nickel sheet; 411. Terminal; 5. Insulating and heat-conducting layer; 51. Positioning groove; 6. Heat exchange structure; 61. Heat exchange through hole. Detailed Implementation

[0030] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0031] Implementation example:

[0032] like Figs. 1-2 The diagram shows a high-voltage battery pack with efficient heat conduction. The battery pack 2 is wrapped in a shell formed by an upper cover plate 3 and a lower cover plate 1. A welding layer 4 covers the surface of the upper cover plate 3 to achieve electrical connection of the battery pack 2. An insulating and heat-conducting layer 5 and a heat exchange structure 6 are then covered to achieve efficient heat exchange of the battery pack.

[0033] The battery pack 2 is divided into multiple groups of cells, which are placed in corresponding sections between the lower cover plate 1 and the upper cover plate 3. Placement slots are provided on the inner sides of the upper cover plate 3 and the lower cover plate 1 for placing the cell groups. The upper cover plate 3 has mounting slots 32 on the outer side corresponding to the cell groups. The welding layer 4 consists of several welding nickel sheets 41 corresponding to the cell groups. The welding nickel sheets 41 are embedded in the mounting slots 32. Welding holes 321 are provided in the mounting slots 32 corresponding to the cell groups. The welding nickel sheets 41 are directly welded to the cell through the mounting holes 311, ensuring a low-resistance electrical connection between them. This helps reduce contact resistance, lower energy loss, and improve the overall efficiency of the battery pack. The welding nickel sheets 41 are connected to the cell in the mounting slots 32, ensuring their own stable position while helping to fix the cell's position, preventing displacement due to vibration or impact. This improves the structural stability of the entire battery pack and further reduces the overall thickness of the battery pack. The welded nickel sheet 41 itself has good thermal conductivity, which can directly conduct the heat generated by the battery cell away, and then further dissipate it through the insulating thermally conductive layer 5 and the heat exchange structure 6, thus improving the thermal management effect of the battery pack. The wiring terminal 411 on one side of the welded nickel sheet 41 is inserted through the mounting groove and exposed from the side of the upper cover plate 3, ensuring that the current from the battery cell to the external circuit (such as the load, charger or monitoring system) can be transmitted stably and efficiently. In this embodiment, the wiring terminal is connected to the acquisition line, which transmits key parameters such as voltage and temperature of each battery cell to the battery management system (BMS). In this way, the BMS can monitor the battery status in real time and execute necessary protection measures, such as overcharge, over-discharge, and short circuit protection, thereby ensuring the safe operation of the battery.

[0034] In this embodiment, the insulating and thermally conductive layer 5 is made of thermally conductive silicone, and its surface is provided with positioning grooves 51. Correspondingly, mounting protrusions 31 are provided on the surface of the upper cover plate 3. The mounting protrusions 31 protrude outward between the mounting grooves 32. The thermally conductive silicone is fitted onto the mounting protrusions 31 through the positioning grooves 51 to achieve adhesion to the upper cover plate 3. At the same time, the surface of the mounting protrusions 31 is provided with internally threaded mounting holes 311, and the surface of the heat exchange structure 6 is provided with heat exchange through holes 61. Bolts pass through the heat exchange through holes 61 and enter the mounting holes 311 to achieve a tight connection between the heat exchange structure 6 and the upper cover plate 3. This presses the thermally conductive silicone and the welding nickel sheet 41 tightly onto the upper cover plate 3, ensuring the shortest heat conduction path from the battery cell to the heat exchange structure 6, which is conducive to the rapid and efficient conduction of heat from the battery cell and avoids the occurrence of local overheating. By tightly clamping the insulating and thermally conductive layer 5 and the welding nickel sheet 41, good contact between the entire surface can be ensured, so that the heat can be evenly distributed on the entire heat exchange structure 6, rather than concentrated on a certain point, thereby improving the heat exchange efficiency.

[0035] In this embodiment, heat exchange structure 6 is a water-cooled plate. The water-cooled plate has an inlet and an outlet. Cold water is pumped into the water-cooled plate through the inlet and flows along the water-cooling pipes within the plate, bending and turning to carry away the heat transferred from the thermally conductive silicone through the outlet. Compared to traditional air cooling, water has a much higher specific heat capacity than air. In the same volume, a water-cooling system can remove more heat, providing a more efficient cooling effect. The water-cooling system ensures that heat is evenly removed from each cell, avoiding localized overheating. While fans and air ducts occupy a significant amount of space, water-cooling systems typically occupy less. In air-cooling systems, fans and heat sinks can obstruct airflow, affecting the layout of other components. Water-cooling systems, however, do not interfere with airflow, allowing for more flexible internal battery pack layout. Furthermore, fans are one of the main noise sources in air-cooling systems, especially at high speeds. In contrast, water pumps in water-cooling systems typically operate at lower noise levels, and noise can be further reduced through optimized design when necessary. Furthermore, when it is necessary to heat up the battery pack, high-temperature liquid can be introduced into the inlet to heat up the battery pack and maintain its optimal operating temperature.

[0036] In summary, the structure of this utility model provides a high-voltage battery pack solution that is smaller, lighter, and has better heat exchange performance. It eliminates the need for an epoxy board between the battery pack and the thermally conductive silicone pad, achieving higher thermal conductivity and further reducing the size and weight of the battery pack.

[0037] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A high-voltage electrical pack with efficient heat conduction structure, characterized in that, It includes a lower cover plate and an upper cover plate, a battery cell pack disposed between the lower cover plate and the upper cover plate, a welding layer disposed on the upper cover plate to connect the battery cell pack, an insulating and heat-conducting layer in close contact with the welding layer, and a heat exchange structure connected to the insulating and heat-conducting layer; The insulating and heat-conducting layer is provided with a plurality of positioning grooves, and the upper cover plate is provided with mounting protrusions corresponding to the positioning grooves. The positioning grooves are fitted onto the mounting protrusions to realize the installation of the insulating and heat-conducting layer on the upper cover plate. The heat exchange structure is connected to the upper cover plate, clamping the welding layer and the insulating heat-conducting layer.

2. The high-voltage electrical pack with efficient heat conduction structure according to claim 1, characterized in that, The battery pack includes several battery cell groups, each battery cell group includes several battery cells, and the welding layer includes welding nickel sheets corresponding to the battery cell groups.

3. The high-voltage electrical pack with high-efficiency heat conduction structure according to claim 2, characterized in that, The upper cover plate is recessed and has several mounting grooves, through which the welding nickel sheet enters and connects to the battery cell assembly.

4. The high-voltage electrical pack with high-efficiency thermal conductivity structure according to claim 3, characterized in that, The welding nickel sheet has a terminal bend on one side, which passes through the mounting groove and protrudes from the side of the upper cover plate for connection to external circuits.

5. The high-voltage electrical pack's efficient heat-conducting structure according to claim 1, characterized in that, The heat exchange structure is provided with heat exchange through holes corresponding to the mounting protrusions, and the mounting protrusions are provided with mounting holes. The heat exchange structure is installed on the upper cover plate by passing a bolt through the heat exchange through hole and into the mounting hole.

6. The high-voltage electrical pack with high-efficiency thermal conductivity structure according to claim 3, characterized in that, The mounting groove is provided with welding holes, which are corresponding to the battery cells to realize the connection between the welding nickel sheet and the battery cell assembly.

7. The high-voltage electrical pack with efficient heat conduction structure according to claim 1, characterized in that, The insulating and thermally conductive layer is thermally conductive silicone.

8. The high-voltage electrical pack with high-efficiency thermal conductivity structure according to claim 1, characterized in that, The heat exchange structure uses liquid heat exchange and is provided with a liquid inlet and a liquid outlet. The liquid inlet allows external heat exchange liquid to enter the heat exchange structure and flow, and the liquid is discharged through the liquid outlet after heat exchange.

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