Water cooling plate for cooling power battery and battery cooling system

Abstract

The invention discloses a water cooling plate for cooling a power battery in the field of thermal management of the power battery, and the water cooling plate comprises a liquid cooling plate body which is arranged at the bottom of a battery module and is internally provided with a liquid cooling flow channel; the commutation structures are arranged in the liquid cooling flow channel at intervals and are used for realizing top-bottom commutation of the cooling liquid; and a battery cooling system. The beneficial effects of the invention are that the interior of the liquid cooling flow channel is divided into a plurality of sub-flow channels through the cold plate ridges, and the replacement flow sheets are arranged in the sub-flow channels, so that the cooling liquid is turned over for multiple times in the flowing process in the sub-flow channels, the cooling effect is better, and the utilization rate of the cooling liquid is higher.

Description

Technical Field

[0001] The present invention relates to the field of thermal management of power batteries, and in particular to a water cooling plate and a battery cooling system for cooling power batteries. Background Art

[0002] Since the ambient temperature of the power battery system and the temperature of the battery itself will directly affect the normal operation, cycle life, charging acceptability, output power, available energy, safety and reliability of the battery, in order to achieve the best performance and life of the battery, it is necessary to introduce a thermal management system to perform low-temperature heating, high-temperature heat dissipation and insulation management on the battery to limit the temperature rise and temperature difference of the battery, achieve temperature uniformity of the battery pack, ensure that the battery operates within an appropriate temperature range, reduce battery performance degradation, and eliminate other potential safety risks.

[0003] The battery thermal management system is one of the key technologies to deal with thermal issues related to batteries and ensure the performance, safety and life of power batteries. The main functions of the battery thermal management system include effective heat dissipation when the battery temperature is high to prevent thermal runaway accidents, preheating when the battery temperature is low to increase the battery temperature to ensure charging and discharging performance and safety at low temperatures, and reducing the temperature difference within the battery pack, inhibiting the formation of local hot spots, preventing the battery from decaying too quickly at high temperature locations, and reducing the overall life of the battery pack.

[0004] In the prior art, the thermal management methods of battery thermal management systems mainly include air cooling and liquid cooling. Air cooling belongs to the first generation of battery cooling methods, which dissipates heat through air ducts. Liquid cooling is the mainstream heat dissipation method at this stage, and it generally contacts the battery through a cooling plate, and uses the cooling medium (mainly including ethylene glycol and water) circulating in the cooling plate to dissipate heat from the power battery.

[0005] Most of the existing liquid cold plates have a problem that the cooling water on the top of the cold plate will always be hotter than the cooling water on the bottom, resulting in the thermal capacity of the cooling water not being fully utilized.

[0006] To this end, we propose a water cooling plate and a battery cooling system for power battery cooling. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the present invention provides a water cooling plate and a battery cooling system for cooling a power battery.

[0008] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0009] A water cooling plate for cooling a power battery, comprising:

[0010] A liquid cooling plate is disposed at the bottom of the battery module and has a liquid cooling channel inside;

[0011] The flow conversion structure is arranged at intervals in the liquid cooling channel to realize top-bottom reversal of the cooling liquid.

[0012] By setting a flow conversion structure in the liquid-cooling channel, the coolant entering the liquid-cooling channel can be exchanged from top to bottom. 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 conversion structure. This setting can realize the disturbance and reversal of the coolant during the flow of the coolant, make full use of the heat capacity of the coolant, and improve the cooling performance of the device.

[0013] It is further defined that the liquid cooling channel is arranged in an M shape, with the middle of the liquid cooling channel being the liquid inlet and the two sides being the liquid outlets; with such an arrangement of the liquid cooling channel, with the middle inlet and outlets on both sides, the temperature in the central area of ​​the battery module is higher. Such an arrangement can be more consistent with the battery module, and the coolant enters from the middle, resulting in a better cooling effect.

[0014] It is further defined that the liquid cooling channel is divided into a plurality of sub-channels by the cold plate ridges along the flow direction of the cooling liquid.

[0015] It is further defined that a mixing zone is provided at the cold plate ridge within the liquid inlet, and the mixing zone is located at the center of the liquid cooling plate body; setting the mixing zone at the center of the liquid cooling plate body can concentrate the coolant in the center area, thereby improving the cooling effect of the center position.

[0016] It is further defined that the commutation structure includes a plurality of commutation plates, the two side surfaces of which are centrally symmetrical spiral surfaces, the top and bottom of the commutation plates are respectively connected to the top plate and bottom plate of the liquid-cooled channel, the two sides are respectively connected to the cold plate ridge, and adjacent commutation plates are also smoothly connected through the spiral surfaces; the commutation plates are arranged in this way, the commutation plates divide each sub-channel into a centrally symmetrical circulation space, so that the coolant is flipped and disturbed during the flow in the sub-channel, thereby improving the cooling performance of the cooling plate body.

[0017] It is further defined that the spacing between the center points of adjacent commutator segments of the commutator structure is gradually set, and the spacing between the center points of adjacent commutator segments in the upstream area of ​​the liquid-cooling channel is greater than the spacing between the center points of the commutator segments in the downstream area of ​​the liquid-cooling channel; upstream of the liquid-cooling channel, the temperature of the coolant is lower and the cooling performance is better, so a lower frequency of flipping is sufficient; downstream of the liquid-cooling channel, the temperature of the coolant is higher and the cooling performance decreases, so a higher frequency of flipping is required by a larger spiral angle, so as to obtain a larger heat dissipation coefficient and improve heat dissipation performance.

[0018] It is further defined that the center point position of each commutation segment in the commutation structure satisfies:

[0019]

[0020] Wherein, n is the number of coolant circulation cycles, b is the scaling factor, L is the length of the commutation 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 position of the current commutation segment and the starting point of the current commutation structure.

[0021] Arranging the commutation plates in this way can make the commutation structure meet the heat dissipation requirements of low temperature on the outside and high temperature in the middle.

[0022] A battery cooling system adopts the above-mentioned water cooling plate for cooling a power battery.

[0023] The beneficial effects of the present invention are as follows: by dividing the liquid cooling channel into multiple sub-channels through the cold plate ridges, and arranging commutation plates in the sub-channels, the coolant is turned over multiple times during the flow in the sub-channels, thereby achieving better cooling effect and higher coolant utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the assembly of the present invention;

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

[0026] Figure 3 A top view of the liquid cooling plate body without the top plate and without the commutation structure installed;

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

[0028] The symbols of the components are as follows:

[0029] Liquid-cooling plate body 1 , liquid-cooling flow channel 11 , liquid inlet 111 , liquid outlet 112 , cold plate ridge 12 , mixing area 13 , commutation structure 2 , commutation sheet 21 , battery module 3 . DETAILED DESCRIPTION

[0030] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0031] Example:

[0032] like Figure 1-Figure 4As shown, a water-cooled plate for cooling a power battery comprises a liquid-cooled plate body 1 and a commutation structure 2; the liquid-cooled plate body 1 is arranged at the bottom of a battery module 3, and a liquid-cooled flow channel 11 is provided inside; the liquid-cooled flow channel 11 is arranged in an m-shape, the middle of the liquid-cooled flow channel 11 is a liquid inlet 111, and the two sides are liquid outlets 112; the liquid-cooled flow channel 11 is divided into a plurality of sub-flow channels by a cold plate ridge 12 along the flow direction of the coolant; the cold plate ridge 12 in the liquid inlet 111 is provided with a mixing zone 13, and the mixing zone 13 is located at the center of the liquid-cooled plate body 1; the commutation structure 2 is arranged at intervals in the liquid-cooled flow channel 11, and realizes top-bottom commutation of the coolant; the commutation structure 2 is arranged at intervals in the liquid-cooled flow channel 11, and realizes top-bottom commutation of the coolant; The structure 2 includes a plurality of commutation plates 21, the two side surfaces of which are centrally symmetrical spiral surfaces, the top and bottom of the commutation plates 21 are respectively connected to the top plate and the bottom plate of the liquid cooling channel 11, and the two sides are respectively connected to the cold plate ridge 12, and the adjacent commutation plates 21 are also smoothly connected through the spiral surfaces; the spacing between the center points of adjacent commutation plates 21 of the commutation structure 2 is gradually arranged, and the spacing between the center points of adjacent commutation plates 21 in the upstream area of ​​the liquid cooling channel 11 is greater than the spacing between the center points of the commutation plates 21 in the downstream area of ​​the liquid cooling channel 11; the liquid outlets 112 of the adjacent liquid cooling plate bodies 1 are arranged adjacently and connected;

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

[0034]

[0035] Among them, n is the number of circulation cycles of the coolant, and one cycle is when the coolant flips from the bottom to the top and then to the bottom. b is the scaling factor, and the value range of b is 0.8-1.2. L is the length of the commutation 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 position of the current commutation segment 21 and the starting point of the current commutation structure 2.

[0036] By setting a commutation structure 2 in the liquid-cooling channel 11, the coolant entering the liquid-cooling channel 11 can achieve top-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 commutation structure 2. This arrangement can achieve disturbance and flipping of the coolant during the flow of the coolant, make full use of the heat capacity of the coolant, and improve the cooling performance of the device; the liquid-cooling channel 11 is set in this way, with the middle inlet and the two sides of the outlet, and the temperature of the central area of ​​the battery module 3 is higher. This arrangement can be more consistent with the battery module 3, and the coolant enters from the middle, and the cooling effect is better; the mixing area 13 is set at the center of the liquid-cooling plate 1. The cooling liquid in the central area is concentrated to improve the cooling effect of the central position; the commutator 21 is arranged in this way, and the commutator 21 divides each sub-channel into a centrally symmetrical circulation space, so that the cooling liquid is turned over and disturbed during the flow in the sub-channel, thereby improving the cooling performance of the cooling plate body; when it is upstream of the liquid-cooled channel 11, the temperature of the coolant is relatively low and the cooling performance is relatively good, so a relatively low frequency of turning is sufficient; downstream of the liquid-cooled channel 11, the temperature of the coolant is relatively high and the cooling performance is reduced, so a higher frequency of turning is required through a larger spiral angle, so as to obtain a larger heat dissipation coefficient and improve the heat dissipation performance.

[0037] A battery cooling system adopts the above-mentioned water cooling plate for cooling a power battery.

Claims

1. A water cooling plate for power battery cooling, characterized in that: include: A liquid cooling plate (1) is arranged at the bottom of the battery module (3) and has a liquid cooling channel (11) therein; The flow conversion structure (2) is arranged at intervals in the liquid cooling channel (11) to realize top-bottom reversal of the cooling liquid.

2. The water cooling plate for power battery cooling according to claim 1, characterized in that: The liquid cooling channel (11) is arranged in an M shape, the middle of the liquid cooling channel (11) is a liquid inlet (111), and both sides are liquid outlets (112).

3. The water cooling plate for power battery cooling according to claim 2, characterized in that: The liquid cooling channel (11) is divided into a plurality of sub-channels by the cold plate ridge (12) along the flow direction of the cooling liquid.

4. The water cooling plate for power battery cooling according to claim 3, characterized in that: The cold plate ridge (12) in the liquid inlet (111) is provided with a mixing zone (13), and the mixing zone (13) is located at the center of the liquid cooling plate body (1).

5. The water cooling plate for power battery cooling according to claim 4, characterized in that: The commutation structure (2) comprises a plurality of commutation plates (21), the two side surfaces of the commutation plates (21) being centrally symmetrical spiral surfaces, the top and bottom of the commutation plates (21) being respectively connected to the top plate and bottom plate of the liquid cooling channel (11), and the two sides being respectively connected to the cold plate ridge (12), and adjacent commutation plates (21) are also smoothly connected via spiral surfaces.

6. The water cooling plate for power battery cooling according to claim 5, characterized in that: The spacing between the center points of adjacent commutation segments (21) of the commutation structure (2) is arranged in a gradual manner, and the spacing between the center points of adjacent commutation segments (21) in the upstream area of ​​the liquid-cooling channel (11) is greater than the spacing between the center points of the commutation segments (21) in the downstream area of ​​the liquid-cooling channel (11).

7. The water cooling plate for power battery cooling according to claim 6, characterized in that: The center point position of each commutation segment (21) in the commutation structure (2) satisfies: Wherein, n is the number of circulation cycles of the coolant, b is the scaling factor, L is the length of the commutation 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 position of the current commutation segment (21) and the starting point of the current commutation structure (2).

8. A battery cooling system, characterized in that: A water cooling plate for power battery cooling as described in any one of claims 1 to 6 is used.

Images