Efficient thermal management power battery system and new energy automobile

Abstract

The utility model discloses an efficient thermal management power battery system and a new energy automobile, the system comprises a power battery box body, a group of battery modules arranged in the power battery box body and a liquid cooling plate structure used for thermal management of the battery modules, the liquid cooling plate structure comprises a bottom liquid cooling plate and a side liquid cooling plate, the bottom liquid cooling plate is arranged at the bottom of the power battery box body and is arranged corresponding to the bottom energy transfer of all the battery modules, and the side liquid cooling plate is arranged on the side surface of each battery module and is integrated with the bottom liquid cooling plate. Efficient heat management is achieved by arranging the liquid cooling plates on the two sides and the bottom of the module in the battery pack, the bottom liquid cooling plate and the side liquid cooling plates are integrally arranged, the side liquid cooling plates are connected with the module end plates, the structure is stable and reliable, and the integrated arrangement cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management of new energy power batteries, and in particular to a high-efficiency thermal management power battery system and a new energy vehicle. Background Art

[0002] With the development of technology and market demand, the new energy industry is placing increasingly strict demands on the charging time of new energy power batteries. However, due to the inherent characteristics of power batteries, the higher the charge rate, the greater the heat generated. If the heat from the battery cannot be dissipated in time, the impact on the cycle life and charge and discharge performance of the power battery system will gradually increase, and may even endanger the personal and property safety of the vehicle users. Therefore, most products on the market currently set relatively conservative charge rates for different battery cells to control the continuous increase in battery temperature. In low temperature conditions, due to the low temperature of the battery itself, high charge rates cannot be used to prevent lithium plating and safety risks. Therefore, in low temperature conditions, the battery must be quickly heated to the appropriate temperature to meet the requirements of fast charging and prevent safety risks.

[0003] Therefore, power battery systems require a technical solution that effectively controls battery temperature rise in high-temperature conditions and rapidly warms at low temperatures, thereby regulating battery temperature to ensure both rapid charging requirements and performance and safety. For example, patent CN117613457A discloses a liquid cooling plate assembly and power battery. The assembly includes a circulation channel and a plate core. The plate core includes a first liquid cooling plate and multiple second liquid cooling plates. The circulation channel includes interconnected water inlet and outlet channels, and a heat dissipation channel. The water inlet and outlet channels are disposed on the first liquid cooling plate, while the heat dissipation channel is disposed on the second liquid cooling plate. Multiple second liquid cooling plates are arranged in rows and spaced apart along a first direction on the first liquid cooling plate. Sub-accommodation spaces are formed between adjacent second liquid cooling plates. Cells of a cell module are disposed within the sub-accommodation spaces, with the sides of the cells contacting the second liquid cooling plates. While this assembly can achieve efficient thermal management of the cell module, the liquid cooling plate structure is complex and relatively expensive. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the present invention provides a high-efficiency thermal management power battery system and a new energy vehicle, the liquid cooling plate structure of which is reasonably designed, stable and relatively low in cost.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A high-efficiency thermal management power battery system includes a power battery case, a group of battery modules arranged in the power battery case, and a liquid cooling plate structure for thermal management of the battery modules. The liquid cooling plate structure includes a bottom liquid cooling plate and a side liquid cooling plate. The bottom liquid cooling plate is arranged at the bottom of the power battery case and corresponds to the bottom energy transmission of all battery modules. The side liquid cooling plates are arranged on the side of each battery module and integrated with the bottom liquid cooling plate.

[0007] The power battery box is an integral box structure.

[0008] The group of battery modules are arranged side by side at intervals, and a corresponding side liquid cooling plate is provided on the side of each battery module.

[0009] The side liquid cooling plate is fixedly connected to the module cell of the corresponding battery module.

[0010] The bottom liquid cooling plate and the side liquid cooling plate are both provided with PTC thermistors.

[0011] The end of the battery module is provided with a module end plate, and the end of the side liquid cooling plate is welded to the module end plate.

[0012] The side liquid cooling plate and the module cells of the corresponding battery module are connected via a cable tie.

[0013] A new energy vehicle comprises the high-efficiency thermal management power battery system.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The high-efficiency thermal management power battery system and new energy vehicle structure are rationally designed. Efficient thermal management is achieved by arranging liquid cooling plates on both sides and bottom of the module in the battery pack. The bottom liquid cooling plate and the side liquid cooling plate are integrated, and the side liquid cooling plate is connected to the module end plate. The structure is stable and reliable, and the integrated setting cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a brief description of the contents and symbols in the drawings of this specification:

[0017] Figure 1 This is an exploded diagram of the utility model's high-efficiency thermal management power battery system.

[0018] Figure 2 This is a diagram of the module inside the power battery box of this utility model.

[0019] Figure 3 This is an exploded view of the modules inside the power battery box of this utility model.

[0020] Figure 4 This is a front view of the bottom liquid cooling plate of the utility model.

[0021] Figure 5 This is a schematic diagram of the reverse side of the bottom liquid cooling plate of the present invention.

[0022] Figure 6 This is a schematic diagram of the liquid cooling plate on the side of the module of the present invention.

[0023] Figure 7 This is a schematic diagram of the integration of the bottom liquid cooling plate and the side liquid cooling plate of the module of the utility model.

[0024] Figure 8 This is a schematic diagram of the bottom and side liquid cooling plates of the battery pack of this utility model.

[0025] Figure 9 This is a schematic diagram of the bottom and side liquid cooling modules of the separate module of the utility model.

[0026] Figure 10 This is a schematic diagram of the three-sided liquid cooling plate of the module of the utility model.

[0027] Figure 11 This is a cross-sectional view of the three-sided liquid cooling plate of the module of this utility model.

[0028] In the picture:

[0029] 1. Battery module, 101. Module cell, 102. Side liquid cooling plate, 103. Module end plate, 2. Power battery box, 3. Upper box cover, 4. Bottom liquid cooling plate. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0031] like Figures 1 to 11 As shown, the high-efficiency thermal management power battery system includes a power battery box 2, a group of battery modules 1 arranged in the power battery box and a liquid cooling plate structure for thermal management of the battery modules; the liquid cooling plate structure includes a bottom liquid cooling plate 4 and a side liquid cooling plate 102. The bottom liquid cooling plate is arranged at the bottom of the power battery box and corresponds to the bottom energy transmission of all battery modules. The side liquid cooling plates are arranged on the side of each battery module and integrated with the bottom liquid cooling plate.

[0032] The utility model has a rational design for the efficient thermal management power battery system. Efficient thermal management is achieved by arranging liquid cooling plates on both sides and the bottom of the module in the battery pack. The bottom liquid cooling plate and the side liquid cooling plates are integrated, and the side liquid cooling plates are connected to the module end plates. The structure is stable and reliable, and the integrated setting cost is relatively low.

[0033] The power battery box 2 is an integral box structure, and a sealing ring and an upper box cover 3 are provided corresponding to the box; the box is equipped with a battery management system, high and low voltage wiring harnesses, BDU module, liquid cooling plate, liquid cooling pipe and important modules; the upper box cover and the box are fixed by bolts, and the sealing ring is fixed between the upper box cover and the box to form a closed space, which plays the role of overall sealing; the box has the function of sealing and supporting all components inside the battery.

[0034] The battery management system controls the charging and discharging of each module cell in the entire battery pack, as well as monitoring information such as temperature and voltage; the BDU module executes the instructions of the battery management system to achieve high-voltage and low-voltage switching and protection; it can adopt existing solutions.

[0035] A group of battery modules are arranged side by side, with each module equipped with a corresponding side liquid cooling plate. The bottom liquid cooling plate is fixed to the box and located inside the battery box, below the module. It contacts the module through a heat-conducting structure. The liquid cooling plate can have a cavity inside, which can pass liquid at a certain temperature to heat or cool the battery cells through the transfer effect. The module is composed of battery cells, busbars, end plates, strapping, side liquid cooling plates, and other components. The battery cell is composed of multiple cells, which are welded together by busbars and connected in series or parallel to form a system.

[0036] The side liquid cooling plates are fixedly connected to the corresponding battery module's module cells 101. The side liquid cooling plates and the corresponding battery module's module cells are connected via cable ties; or the battery module ends are provided with module end plates 103, and the ends of the side liquid cooling plates are welded to the module end plates.

[0037] PTC thermistors are installed on both the bottom and side cooling plates. The end plates and strapping secure the entire module, while the bottom and side cooling plates heat and cool the battery cells.

[0038] The preferred specific examples of the present invention are:

[0039] Preferred embodiment 1: Liquid cooling plate on the module side. The liquid cooling plate and the battery cell are in contact through a thermally conductive silicone pad and a thermally conductive structural adhesive, so that energy transfer is achieved between the battery cell and the liquid cooling plate. The liquid cooling plate has a water inlet and outlet, and the liquid cooling plate is fixed to both sides of the module with a strapping tape. This allows the energy on the upper part of the battery cell to be efficiently transferred to the liquid cooling plate.

[0040] Preferred embodiment 2: The module side liquid cooling plate can be welded to the module end plate, thereby playing a role of fixing and restraining the module, eliminating the tie for fixing the module, and effectively ensuring effective contact between the liquid cooling plate and the battery cell, thereby improving energy utilization efficiency.

[0041] Preferred implementation plan three: If the new energy vehicle does not have the function of hydrothermal PTC or other heat source, the PTC function can be integrated through the liquid cooling plate on the side of the module to heat the battery through PTC; the module is cooled through the flow channel of the side liquid cooling plate.

[0042] Preferred embodiment 4: The module side liquid cooling plate can be formed by stamping according to the designed flow channel to ensure efficient energy transfer of the liquid cooling plate; the liquid cooling plate can also be formed by extrusion process into a harmonica tube with a cavity inside for the circulation of cooling liquid;

[0043] Preferred embodiment 5: The module-side liquid cooling plate and the battery cell are connected via a thermally conductive silicone pad or thermally conductive structural adhesive, thereby efficiently transferring energy;

[0044] Preferred embodiment 6: The module-side liquid cooling plate can be a single-sided liquid cooling or a double-sided liquid cooling structure, and the specific selection is based on the performance of the battery cell and the design effect;

[0045] Preferred embodiment seven: There are multiple modules in the battery pack, and the side liquid cooling of the module can be a single module design, or two modules can share the middle liquid cooling plate;

[0046] Preferred embodiment eight: The liquid cooling plate at the bottom of the battery pack is made by punching, welding and brazing. The bottom liquid cooling plate is provided with regular or irregular flow channels, through which coolant flows. The bottom liquid cooling plate contacts the battery cell through a thermally conductive silicone pad or thermally conductive structural adhesive, thereby efficiently transferring energy.

[0047] Preferred embodiment nine: A PTC component is provided between the flow channels of the bottom liquid cooling plate, which can heat the module after power is applied. The bottom liquid cooling plate is integrated with PTC to effectively utilize the space inside the battery pack;

[0048] Preferred Implementation Option 10: The module can be covered on three sides by the liquid cooling plate at the bottom of the box and the side liquid cooling plate, thereby achieving efficient energy transfer and further controlling the temperature of the battery cell;

[0049] Preferred Implementation Plan 11: PTC components can be integrated into the bottom and side liquid cooling plates of the module to meet the different configurations and different thermal management requirements of new energy vehicles;

[0050] The technical solution of this utility model is to achieve the purpose of cooling and heating the module by arranging liquid cooling plates on both sides and the bottom of the module in the battery pack, and cooling and heating the liquid inside the liquid cooling plates through the vehicle's components. Furthermore, by adding side liquid cooling to the liquid cooling plate at the bottom of the module, the contact area with the module's battery cells is increased, thereby improving energy utilization efficiency. The bottom liquid cooling plate and the side liquid cooling plates are integrated, and through the interconnection of internal flow channels, the entire module is placed in a single cooling structure, ensuring temperature uniformity throughout the entire module and the entire module package, reducing temperature differences in the battery cells and ensuring battery performance. By integrating PTC heating functions into the side or bottom liquid cooling plates, the number of vehicle components is reduced, meeting performance requirements while reducing the cost of the new energy vehicle. The integration forms a holistic structure that is stable and reliable.

[0051] The above is only an illustration of a preferred embodiment of the present invention. The above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0052] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A high-efficiency thermal management power battery system, comprising a power battery housing, a group of battery modules disposed within the power battery housing, and a liquid cooling plate structure for thermal management of the battery modules, characterized in that: The liquid cooling plate structure includes a bottom liquid cooling plate and a side liquid cooling plate. The bottom liquid cooling plate is arranged at the bottom of the power battery box and corresponds to the bottom energy transmission of all battery modules. The side liquid cooling plate is arranged on the side of each battery module and is integrated with the bottom liquid cooling plate. The power battery box is an integral box structure; the battery modules are arranged side by side, and each battery module is provided with a corresponding side liquid cooling plate on the side; the bottom liquid cooling plate and the side liquid cooling plate are each provided with a PTC thermistor; The side liquid cooling plate and the module core of the corresponding battery module are fixedly connected; the end of the battery module is provided with a module end plate, and the end of the side liquid cooling plate is welded to the module end plate; or the side liquid cooling plate and the module core of the corresponding battery module are connected by a cable tie; The corresponding box body is provided with a sealing ring and an upper box cover; the box body is provided with a battery management system, high and low voltage wiring harnesses, BDU module, liquid cooling plate, and liquid cooling pipe; the upper box cover and the box body are fixed with bolts, and the sealing ring is fixed between the upper box cover and the box body; The bottom liquid cooling plate is fixed on the box body, located inside the battery box body, and located at the bottom of the module. It contacts the module through a heat-conducting structure. The liquid cooling plate may have a cavity inside, and the cavity may pass liquid at a certain temperature.

2. A new energy vehicle, characterized by: Comprising the high-efficiency thermal management power battery system as claimed in claim 1.

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