A water-cooled plate and battery cooling system for power battery cooling

Abstract

The application discloses a kind of water-cooled plates for power battery cooling in the field of power battery thermal management, comprising: liquid cooling plate body, be located at battery module bottom, and inside being provided with liquid cooling flow channel;Flow conversion structure is spaced apart in liquid cooling flow channel, and realizes top and bottom commutation to cooling liquid;And a kind of battery cooling system;The beneficial effects of the application are: by being separated into multiple sub-flow channels by cold plate ridge in liquid cooling flow channel, setting flow conversion sheet in sub-flow channel, so that cooling liquid occurs multiple overturning in the process of flowing in sub-flow channel, cooling effect is better, and cooling liquid utilization is higher.

Description

Technical Field

[0001] This invention relates to the field of power battery thermal management, and more specifically to a water-cooled plate and battery cooling system for power battery cooling. Background Technology

[0002] Since the ambient temperature of the power battery system and the battery's own temperature directly affect the battery's normal operation, cycle life, charging acceptability, output power, available energy, safety, and reliability, a thermal management system is needed to perform low-temperature heating, high-temperature heat dissipation, and heat preservation management to ensure that the battery achieves optimal performance and lifespan. This limits the battery's temperature rise and temperature difference, achieves uniform battery pack temperature, ensures that the battery operates within a suitable temperature range, reduces battery performance degradation, and eliminates other potential safety risks.

[0003] Battery thermal management systems are a key technology for addressing battery thermal-related issues and ensuring the performance, safety, and lifespan of power batteries. The main functions of a battery thermal management system include effectively dissipating heat when the battery temperature is high to prevent thermal runaway; preheating the battery when the temperature is low to increase the battery temperature and ensure charging and discharging performance and safety at low temperatures; and reducing temperature differences within the battery pack to suppress the formation of localized hot zones and prevent excessive battery degradation at high-temperature locations, thus reducing the overall lifespan of the battery pack.

[0004] In existing technologies, battery thermal management systems primarily employ two methods: air cooling and liquid cooling. Air cooling is a first-generation battery cooling method, which dissipates heat through airflow via ducts. Liquid cooling is currently the mainstream heat dissipation method, typically involving contact between a cooling plate and the battery, utilizing a cooling medium (mainly ethylene glycol and water) circulating within the cooling plate to dissipate heat from the power battery.

[0005] Most existing liquid cooling plates have a problem: the cooling water at the top of the plate is always hotter than the cooling water at the bottom, which means that the heat capacity of the cooling water is not fully utilized.

[0006] Therefore, we propose a water-cooled plate and battery cooling system for cooling power batteries. Summary of the Invention

[0007] To address the aforementioned shortcomings of the prior art, the present invention provides a water-cooled plate and a battery cooling system for cooling power batteries.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0009] A water-cooled plate for cooling power batteries, comprising:

[0010] The liquid cooling plate is located at the bottom of the battery module and has liquid cooling channels inside.

[0011] The commutation structure is spaced within the liquid cooling channel to achieve top-to-bottom reversal of the coolant flow.

[0012] By setting up a flow exchange structure in the liquid cooling channel, the coolant flowing into the liquid cooling channel can achieve top-to-bottom exchange. During the flow process, the coolant at the bottom will rotate to the top of the liquid cooling channel due to the action of the flow exchange structure. This setting can disturb and tumble the coolant during the flow process, make full use of the heat capacity of the coolant, and improve the cooling performance of the device.

[0013] Further specifying, the liquid cooling channel is arranged in an M-shape, with the inlet in the middle and the outlets on both sides. With this liquid cooling channel, the central inlet and the outlets on both sides are located in the central area of ​​the battery module where the temperature is higher. This arrangement can better match the battery module, and the coolant enters from the middle, resulting in better cooling effect.

[0014] Further defining the liquid cooling channel, it is divided into several sub-channels along the direction of coolant flow by the cold plate ridge.

[0015] Furthermore, a mixing zone is provided on the cold plate ridge inside the liquid inlet, and the mixing zone is located at the center of the liquid cooling plate. Setting a mixing zone at the center of the liquid cooling plate can concentrate the coolant in the central area and improve the coolant effect in the central area.

[0016] Further defining the flow converter structure, it includes several flow converter plates. The two sides of each flow converter plate are centrally symmetrical spiral curved surfaces. The top and bottom of each flow converter plate are connected to the top and bottom plates of the liquid cooling channel, respectively, and the two sides are connected to the ridges of the cold plate. Adjacent flow converter plates are also smoothly connected by spiral curved surfaces. With the flow converter plates arranged in this way, each flow converter plate divides each sub-channel into a centrally symmetrical flow space, causing the coolant to tumble and turbulent during its flow within the sub-channel, thereby improving the cooling performance of the cooling plate.

[0017] Furthermore, the spacing between the center points of adjacent converter plates in the converter structure is set in a gradually changing manner. The spacing between the center points of adjacent converter plates in the upstream region of the liquid cooling channel is greater than the spacing between the center points of converter plates in the downstream region of the liquid cooling channel. In the upstream region of the liquid cooling channel, the temperature of the coolant is lower and the cooling performance is better, so a lower frequency of tumbling is sufficient. In the downstream region of the liquid cooling channel, the temperature of the coolant is higher and the cooling performance decreases, so a larger spiral angle is required to obtain a higher frequency of tumbling, thereby obtaining a larger heat dissipation coefficient and improving heat dissipation performance.

[0018] Further specifying, the center point position of each converter segment in the converter structure satisfies:

[0019]

[0020] Where n is the number of coolant circulation cycles, b is the scaling factor, L is the length of the converter structure, and A(x) is the amplitude function related to the center point x; when A(x) = 0, x is the distance between the center point of the current converter plate and the starting point of the current converter structure.

[0021] This configuration of the converter plates allows the converter structure to meet the heat dissipation requirements of low temperature on the outside and high temperature in the middle.

[0022] A battery cooling system employs the aforementioned water-cooled plate for cooling power batteries.

[0023] The beneficial effects of this invention are as follows: by dividing the liquid cooling channel into multiple sub-channels through the cold plate ridge and setting exchange plates in the sub-channels, the coolant undergoes multiple tumbling processes during its flow in the sub-channels, resulting in better cooling effect and higher coolant utilization. Attached Figure Description

[0024] Figure 1 This is an assembly diagram of the present invention;

[0025] Figure 2 A top view of the liquid-cooled plate without the top plate;

[0026] Figure 3 Top view of the liquid cooling plate without the top plate and without the converter structure installed;

[0027] Figure 4 This is a three-dimensional schematic diagram of the converter structure.

[0028] The symbols for each component are as follows:

[0029] Liquid cooling plate 1, liquid cooling channel 11, liquid inlet 111, liquid outlet 112, cold plate ridge 12, mixing zone 13, commutation structure 2, commutation plate 21, battery module 3. Detailed Implementation

[0030] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0031] Example:

[0032] like Figures 1-4As shown, a water-cooled plate for cooling a power battery includes a liquid-cooled plate body 1 and a commutation structure 2. The liquid-cooled plate body 1 is located at the bottom of the battery module 3 and has liquid-cooled flow channels 11 inside. The liquid-cooled flow channels 11 are arranged in an m-shape, with an inlet 111 in the middle and outlets 112 on both sides. The liquid-cooled flow channels 11 are divided into several sub-channels along the flow direction of the coolant by cold plate ridges 12. A mixing zone 13 is formed in the cold plate ridge 12 inside the inlet 111, and the mixing zone 13 is located at the center of the liquid-cooled plate body 1. The commutation structure 2 is spaced within the liquid-cooled flow channels 11 to achieve top-to-bottom reversal of the coolant flow. Structure 2 includes several converter plates 21. The two sides of the converter plates 21 are centrally symmetrical spiral curved surfaces. The top and bottom of the converter plates 21 are connected to the top plate and bottom plate of the liquid cooling channel 11, respectively, and the two sides are connected to the cold plate ridge 12, respectively. Adjacent converter plates 21 are also smoothly connected by spiral curved surfaces. The spacing between the center points of adjacent converter plates 21 in the converter structure 2 is gradually set. The spacing between the center points of adjacent converter plates 21 in the upstream region of the liquid cooling channel 11 is greater than the spacing between the center points of converter plates 21 in the downstream region of the liquid cooling channel 11. The liquid outlets 112 of adjacent liquid cooling plates 1 are connected adjacently.

[0033] The center point position of each converter segment 21 in converter structure 2 satisfies:

[0034]

[0035] Where n is the number of coolant circulation cycles, which is the coolant flipping from bottom to top and then back to bottom; b is the scaling factor, which ranges from 0.8 to 1.2; L is the length of the converter structure 2; and A(x) is the amplitude function related to the center point x. When A(x) = 0, x is the distance between the center point of the current converter plate 21 and the starting point of the current converter structure 2.

[0036] By setting a flow exchange structure 2 inside the liquid cooling channel 11, the coolant flowing into the liquid cooling channel 11 can achieve top-to-bottom exchange. During the flow process, the coolant at the bottom will rotate to the top of the liquid cooling channel 11 due to the action of the flow exchange structure 2. This arrangement can disturb and tumble the coolant during the flow process, making full use of the heat capacity of the coolant and improving the cooling performance of the device. With this arrangement of the liquid cooling channel 11, the central inlet and the two outlets are located in the central area of ​​the battery module 3, where the temperature is higher. This arrangement can better fit the battery module 3, and the coolant enters from the middle, resulting in better cooling effect. A mixing zone 13 is set at the center of the liquid cooling plate 1 to... This design concentrates the coolant in the central area, improving the cooling effect at the center. The circulator fins 21 divide each sub-channel into a centrally symmetrical flow space, causing the coolant to tumble and turbulent as it flows within the sub-channels, thus improving the cooling performance of the cooling plate. Upstream of the liquid cooling channel 11, the coolant temperature is lower and the cooling performance is better, so a lower frequency of tumbling is sufficient. Downstream of the liquid cooling channel 11, the coolant temperature is higher and the cooling performance decreases, so a larger spiral angle is needed to achieve a higher frequency of tumbling, thereby obtaining a larger heat dissipation coefficient and improving heat dissipation performance.

[0037] A battery cooling system employs the aforementioned water-cooled plate for cooling power batteries.

Claims

1. A water-cooled plate for cooling power batteries, characterized in that, include: A liquid cooling plate (1) is located at the bottom of the battery module (3) and has a liquid cooling channel (11) inside. The commutation structure (2) is spaced within the liquid cooling channel (11) to achieve top-bottom commutation of the coolant; The liquid cooling channel (11) is arranged in an m-shape, with the inlet (111) in the middle and the outlets (112) on both sides. The liquid cooling channel (11) is divided into several sub-channels along the flow direction of the coolant by the cold plate ridge (12); The converter structure (2) includes several converter plates (21). The two sides of the converter plate (21) are centrally symmetrical spiral curved surfaces. The top and bottom of the converter plate (21) are connected to the top plate and bottom plate of the liquid cooling channel (11) respectively, and the two sides are connected to the cold plate ridge (12) respectively. Adjacent converter plates (21) are also smoothly connected by spiral curved surfaces.

2. The water-cooled plate for cooling power batteries according to claim 1, characterized in that, The cold plate ridge (12) inside the liquid inlet (111) has a mixing zone (13), which is located at the center of the liquid cooling plate (1).

3. The water-cooled plate for cooling power batteries according to claim 2, characterized in that, The spacing between the center points of adjacent converter plates (21) in the converter structure (2) is gradually varied. The spacing between the center points of adjacent converter plates (21) in the upstream region of the liquid cooling channel (11) is greater than the spacing between the center points of converter plates (21) in the downstream region of the liquid cooling channel (11).

4. The water-cooled plate for cooling power batteries according to claim 3, characterized in that, The center point position of each converter segment (21) in the converter structure (2) satisfies: ； in, This refers to the number of coolant circulation cycles. This is the scaling factor. The value range is 0.8-1.

2. The length of the converter structure (2) is For the center point The relevant amplitude function; when When =0, This is the distance between the center point of the current converter segment (21) and the starting point of the current converter structure (2).

5. A battery cooling system, characterized in that, The water-cooled plate for cooling power batteries as described in any one of claims 1-4 is used.

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