JP-7855736-B2 - Energy storage battery pack thermal management system

Inventors

• 謝 長淮
• 趙 丹丹
• 李 全一
• 楊 同歡
• 李 佳
• 陳 曙娟
• 陳 菲
• 張 菜青
• 呉 則剛
• 頼 其曉
• 于 澤群

Assignees

• 浙江極▲け▼智能科技有限公司
• 威睿電動汽車技術（寧波）有限公司
• 浙江吉利控股集団有限公司

Dates

Publication Date

20260508

Application Date

20240104

Priority Date

20230104

Claims (9)

1. An energy storage battery pack thermal management system comprising a plurality of energy storage battery packs (2) and a plurality of temperature control subunits, wherein each energy storage battery pack (2) comprises a plurality of battery modules and a main housing for housing the battery modules, the plurality of temperature control subunits are each attached to the plurality of energy storage battery packs (2), each temperature control subunit comprises a speed control fan (1) for cooling the energy storage battery pack (2), a temperature detection device for detecting the battery module temperature, and a PWM controller, the speed control fan (1), the temperature detection device, and the PWM controller of the same temperature control subunit are signal-connected, the PWM controller is used to adjust the duty cycle of the speed control fan (1) based on the difference between the battery module temperature and a temperature threshold, the temperature threshold is a preset value, The PWM controller is further used to adjust the duty cycle of the speed-adjustable fan (1) by a first duty cycle preset value when the difference between the battery module temperature and the temperature threshold is less than or equal to a first difference, and the PWM controller is further used to adjust the duty cycle of the speed-adjustable fan (1) by a second duty cycle preset value when the difference between the battery module temperature and the temperature threshold is less than or equal to a second difference, and the first difference, the second difference, the first duty cycle preset value, and the second duty cycle preset value are all preset values, and the second difference is greater than the first difference. A thermal management system for energy storage battery packs, characterized by the following features.
2. The energy storage battery pack (2) further includes a cooling duct, the cooling duct is provided within the main housing, the speed control fan (1) is provided at one end of the cooling duct and communicates with the cooling duct, and the battery modules are provided on both sides of the cooling duct. The energy storage battery pack thermal management system according to feature 1.
3. The temperature detection device is used to be in close contact with the plurality of battery modules, to detect the temperature of the plurality of battery modules in close contact with it, and to transmit the battery module temperature to the PWM controller. The energy storage battery pack thermal management system according to feature 1.
4. The PWM controller is signal-connected to the speed-adjustable fan (1) located within the same battery module, and the PWM controller controls the duty cycle of the speed-adjustable fan (1) within the same battery module to bring the battery module temperature closer to the temperature threshold. The energy storage battery pack thermal management system according to feature 3.
5. The PWM controller is signal-connected to the temperature detection device located within the same battery module, and the PWM controller is used to adjust the duty cycle of the speed control fan (1) based on the temperature of the battery module in close contact with the temperature detection device and the temperature threshold. The energy storage battery pack thermal management system according to feature 4.
6. The aforementioned speed-adjustable fan is a PWM fan. The energy storage battery pack thermal management system according to feature 1.
7. The aforementioned speed-adjusting fan is an energy-storing temperature-controlled fan. The energy storage battery pack thermal management system according to feature 1.
8. The energy storage battery pack thermal management system further includes a plurality of battery clusters, each of which comprises a plurality of energy storage battery packs (2), and the plurality of temperature control subunits within a single battery cluster are signal-connected via sub-control boxes, and the plurality of sub-control boxes are signal-connected via a main control box, which controls all of the temperature control subunits via the sub-control boxes to ensure that the duty cycles of all of the speed control fans are not exactly the same. The energy storage battery pack thermal management system according to feature 1.
9. The main control box includes an electrical control system, which is used to control the temperature control subunit to detect the battery module temperature with a temperature detection interval as the period, and the temperature detection interval is a preset value. The energy storage battery pack thermal management system according to feature 8 .

Description

The present invention relates to the technical field of energy storage systems, and more particularly to a thermal management system for energy storage battery packs. <Cross-reference of related applications> This patent application claims priority to the Chinese patent application filed on January 4, 2023, with application number 202320015462.5, with applicants Zhejiang Geely Intelligent Technology Co., Ltd., Weirui Electric Automobile Technology (Ningbo) Co., Ltd., and Zhejiang Geely Holding Group Co., Ltd., with the title of the invention "Energy Storage Battery Pack Thermal Management System," and the entire text of the said application is incorporated into this application by reference. An energy storage system is typically a device assembly that rationally utilizes energy to improve energy utilization efficiency, collecting temporarily unused energy in some way and storing it for reuse. Currently, using fans for cooling within energy storage systems is the most common cooling method in the industry. Fan cooling is widely used due to its advantages such as simple structure, low cost, mature technology, and high reliability. This is a schematic diagram of the energy storage battery pack thermal management system provided by the present invention.This is a schematic flow diagram showing how the energy storage system in the present invention controls the battery module temperature.This is a schematic diagram of the temperature control subunit in the present invention. To further explain the technical means and effects employed by the present invention to achieve its intended objectives, the present invention will be described in detail below with reference to the drawings and preferred embodiments. The terms "first," "second," "third," "fourth," etc., used in the specification and claims of this invention are intended to distinguish similar objects and not to indicate a specific order or arrangement. Referring to Figures 1 to 3, the energy storage battery pack thermal management system of the present invention includes a plurality of energy storage battery packs 2 and a plurality of temperature control subunits. Each energy storage battery pack 2 includes a plurality of battery modules and a main housing for housing the battery modules. Each of the temperature control subunits is attached to the plurality of energy storage battery packs 2, and each temperature control subunit includes a speed control fan 1 for cooling the energy storage battery pack 2, a temperature detection device for detecting the battery module temperature, and a PWM controller. Specifically, the speed control fan 1, temperature detection device, and PWM controller of the same temperature control subunit are signal-connected and are all provided in the same energy storage battery pack 2. The temperature detection device can detect the temperature of a battery module located within the same energy storage battery pack 2, and the PWM controller can adjust the duty cycle of the speed control fan 1 based on the difference between the battery module temperature and a preset temperature threshold. In this embodiment, the temperature threshold is 30°C. When the temperature detection device detects that the battery module temperature is higher than this value, the PWM controller outputs a high duty cycle signal to increase the rotation speed of the speed control fan 1, bringing the battery module temperature closer to the 30°C threshold. Conversely, if the temperature is higher, the PWM controller outputs a low duty cycle signal to decrease the rotation speed of the speed control fan 1, bringing the battery module temperature closer to the 30°C threshold. In particular, the PWM controller in this invention is connected to speed control fans 1 located in the same energy storage battery pack 2, and controls only the speed control fans 1 located in the same energy storage battery pack 2. The temperature detection device also detects only the battery modules located within the same energy storage battery pack 2. In other words, in the energy storage battery pack thermal management system of this invention, any energy storage battery pack 2 can be cooled independently based on its own cooling policy, i.e., the battery module temperature, without being affected by the cooling policy of any other energy storage battery pack 2, thereby stabilizing the temperature of the entire energy storage system and reducing unnecessary fan losses. Referring particularly to Figures 2 and 3, the temperature detection device in the present invention is in close contact with multiple battery modules, and is used to detect the temperature of the multiple battery modules in close contact with it and transmit it to a PWM controller as the battery module temperature . The PWM controller is signal-connected to a speed control fan 1 located within the same battery module, and the PWM controller can bring the battery module temperature closer to the temperature threshold by