Lithium battery liquid cooling structure based on blood vessel bionic flow channel

Abstract

The utility model discloses a lithium battery liquid cooling structure based on a blood vessel bionic flow channel, and relates to the technical field of power lithium battery cooling. The battery pack comprises a battery module, a heat conduction pad and a liquid cooling plate, and is characterized in that the bottom of the battery module is attached to the top of the heat conduction pad, the top of the liquid cooling plate is attached to the bottom of the heat conduction pad, the top of the liquid cooling plate is attached to the bottom of the heat conduction pad, and the liquid cooling plate is composed of an upper cooling plate and a lower cooling plate; a flow channel of the liquid cooling plate is designed on the basis of a blood vessel flow field, the liquid cooling plate is composed of the upper cooling plate and the lower cooling plate, the cooling liquid inlet and the cooling liquid outlet are formed in the two ends of the diagonal line of the cooling plate, cooling liquid flows into the flow channel on the periphery of the cooling plate through the inlet and is distributed in a radiation mode, and the cooling liquid is cooled through the cooling liquid inlet and the cooling liquid outlet. And the heat of the battery pack is led out from the outlet. The arrangement of the inner and outer flow channels with different configurations balances the power consumption and the cooling effect of the liquid cooling plate.

Description

Technical Field

[0001] The utility model relates to the technical field of power lithium battery cooling, in particular to a lithium battery liquid cooling structure based on a blood vessel bionic flow channel. Background Art

[0002] Pure electric vehicle power batteries will generate a lot of heat during the charging and discharging process, and the role of the battery thermal management system is to promptly remove the heat generated during the battery operation process, avoid problems such as battery thermal runaway caused by the accumulation of a large amount of heat, and adjust the battery pack to work within the required temperature range. The liquid cooling plate is an important component of the battery thermal management liquid cooling system. Excellent and reasonable structural design has an important influence on improving the battery heat exchange performance and improving the cooling efficiency.

[0003] In the current research on power battery liquid cooling plates, the design of the flow channel is still the key and difficult point of cold plate design. Most of the optimized liquid cooling plate flow channel structure designs can meet the cooling requirements of the battery and control the maximum temperature and maximum temperature difference of the battery within a reasonable range. However, there is still a problem that the design parameters cannot be well balanced. When the cooling performance requirements are met, the pressure drop and flow resistance cannot be well taken into account. In addition, in the process of innovative design of liquid cooling plates, in addition to meeting the basic heat exchange requirements, the uniformity of the temperature distribution of the single cells in the battery is also a factor that needs to be focused on and considered. Lithium batteries are highly sensitive to temperature. The uneven temperature distribution caused by the electrochemical reaction inside the battery during battery operation and the uneven battery temperature distribution caused by the heat exchange of the external battery thermal management system will affect the performance of the battery, which may cause the charge state and aging speed of each single cell to be inconsistent, aggravating the inconsistency of the battery and causing the capacity, power and life of the entire battery pack to decay. Therefore, in the analysis and design of the cooling and heat exchange of the liquid cooling plate, it is also necessary to take into account the impact of the uniformity of the temperature distribution of different single cells on the consistency of the battery. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a lithium battery liquid cooling structure based on vascular bionic flow channels to solve the technical problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lithium battery liquid cooling structure based on vascular bionic flow channel, comprising a battery module, a thermal pad and a liquid cooling plate, characterized in that: the bottom of the battery module is in contact with the top of the thermal pad, the top of the liquid cooling plate is in contact with the bottom of the thermal pad, the liquid cooling plate is composed of an upper cold plate and a lower cold plate, the upper cold plate and the lower cold plate enclose a flow channel groove to form a cooling cavity, and a cooling liquid inlet and a cooling liquid outlet are provided on the liquid cooling plate.

[0006] Furthermore, the battery module is formed by an array of single lithium-ion batteries.

[0007] By adopting the above technical solution, the array arrangement can make the temperature of the single lithium-ion batteries cool more evenly.

[0008] Furthermore, the thermal pad is a silicone thermal pad, and the thermal pad is connected and fixed to the battery module, the thermal pad and the upper cold plate by bonding or locking parts.

[0009] By adopting the above technical solution, the silicone thermal pad can realize heat conduction between the liquid cooling system and the battery module, playing a role of filling and heat conduction.

[0010] Furthermore, the cooling liquid inlet and the cooling liquid outlet are arranged at two ends of the diagonal line of the liquid cooling plate and are connected to the flow channel groove, and are formed by the upper cooling plate and the lower cooling plate.

[0011] By adopting the above technical solution, diagonally arranging the coolant inlet and the coolant outlet is beneficial to improving the coolant inlet and outlet flow angles and reducing the power consumption of the coolant pump.

[0012] Furthermore, the flow channel groove is integrally stamped by a lower cold plate, and the lower cold plate is made of a single-layer aluminum plate material.

[0013] By adopting the above technical solution, the processing technology is simple, the production is more convenient, and the aluminum plate has good thermal conductivity.

[0014] Furthermore, a surface of the lower cold plate facing the upper cold plate is a fitting surface, and the surroundings of the fitting surface and the area except the coolant flow channel are all fitting areas.

[0015] By adopting the above technical solution, the fitting area is fixedly connected to the cold plate on the liquid cooling plate by bonding, welding or locking parts, thereby forming a cooling cavity.

[0016] Furthermore, in addition to the main channel connected to the coolant inlet and the coolant outlet, the flow channel groove also includes multiple groups of branch flow channels connected to the main channel. The multiple groups of branch flow channels are arranged in parallel, and the branch flow channels are divided into two sides according to the diagonal of the lower cold plate. The branch flow channels on both sides are symmetrically distributed with the midpoint of the diagonal of the lower cold plate as the center.

[0017] By adopting the above technical solution, the coolant flows into the flow channels around the cold plate through the inlet and radiates outward, and then converges at the outlet to remove the heat from the battery pack. The setting of the internal and external flow channels with different configurations balances the power consumption and cooling effect of the liquid cooling plate.

[0018] Furthermore, the flow channel groove includes, in addition to the main flow channel connected to the coolant inlet and the coolant outlet, a plurality of branch flow channels connected to the main flow channel, the plurality of branch flow channels are arranged in parallel, and the branch flow channels are divided into two sides according to the diagonal line of the lower cold plate, and the branch flow channels on both sides are symmetrically distributed with the midpoint of the diagonal line of the lower cold plate as the center.

[0019] By adopting the above technical solution, based on the fluidity of bionic blood vessels, a main channel and a branch channel are set, and the branch channel is further divided into inner and outer channels. The two channels are arranged to cover the entire cold plate to ensure effective heat exchange in all parts of the cold plate.

[0020] Furthermore, the branch flow channel includes an inner flow channel and an outer flow channel, the outer flow channel includes a first outer flow channel, a second outer flow channel, a third outer flow channel and a fourth outer flow channel, the outer flow channel is arranged close to the outer side of the liquid cooling plate, and the outer flow channel is parallel to the outer edge of the liquid cooling plate, the inner flow channel is a parallel oblique flow channel, the inner flow channel is parallel to the main flow channel, and both ends of the inner flow channel are connected to the fourth outer flow channel; the inner flow channel includes a first inner flow channel, a second inner flow channel, a third inner flow channel, a curved flow channel of unequal width to the fourth outer flow channel, and a central flow channel arranged along the diagonal direction of the liquid cooling plate after being diverted by the main flow channel, and the first inner flow channel and the second inner flow channel are double-branch oblique flow channels, the coolant is diverted from the main flow channel to the branch fourth outer flow channel, and is diverted in parallel through the fourth outer flow channel.

[0021] By adopting the above technical solution, the inner and outer flow channels are set to have unequal widths, and the flow rate of each flow channel is adjusted according to the flow resistance and impedance to ensure that the flow rate of each branch flow channel is evenly distributed, thereby improving the uniformity of temperature distribution of the structure.

[0022] Furthermore, the inner flow channel and the outer flow channel have different widths, and the outer flow channel is longer and smaller in width than the inner flow channel.

[0023] By adopting the above technical solution, the design ensures the uniformity of flow distribution in the inner and outer flow channels, and further improves the uniformity of the cooling and heat dissipation effect.

[0024] Furthermore, the branch flow channel is arranged in a circuitous manner, a rounded corner is arranged at the fluid turning point for a smooth transition, and a rounded chamfer is arranged at the bottom of the cross section of the main flow channel and the branch flow channel.

[0025] By adopting the above technical solution, the flow resistance of the coolant is further reduced and the energy consumption is reduced.

[0026] In summary, the utility model mainly has the following beneficial effects:

[0027] 1. The flow channel of the liquid cooling plate of the utility model is designed based on the blood vessel flow field. The liquid cooling plate is composed of an upper and lower cold plate. The coolant inlet and outlet are placed at both ends of the diagonal of the cold plate. The coolant flows into the flow channel around the cold plate through the inlet and radiates and diverts, and then converges at the outlet to extract the heat of the battery pack. The setting of the two different configurations of the inner and outer flow channels balances the power consumption and cooling effect of the liquid cooling plate;

[0028] 2. The flow channels of the liquid cooling plate of the utility model are set to be of unequal width. The outer flow channel near the outer side of the liquid cooling plate is set to be of smaller width, and the parallel inner flow channel near the center of the liquid cooling plate gradually increases its width according to the distance of the flow channel from the center. This design ensures the uniformity of the flow distribution of the inner and outer flow channels, and further improves the uniformity of the cooling and heat dissipation effect;

[0029] 3. The liquid cooling plate of the utility model optimizes the flow resistance of the local area of ​​the flow channel according to the flow field distribution of the coolant to reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the liquid cooling plate of the utility model;

[0032] Figure 3 This is a schematic diagram of the flow channel structure of the utility model;

[0033] Figure 4 This is a schematic diagram of the cross-sectional structure of the liquid cooling plate of the present utility model.

[0034] In the figure: 1. battery module; 2. thermal pad; 3. liquid cooling plate; 4. upper cold plate; 5. lower cold plate; 6. coolant inlet; 7. coolant outlet; 8. flow channel; 801. main flow channel; 802. branch flow channel; 8021. inner flow channel; 80211. central flow channel; 80212. first inner flow channel; 80213. second inner flow channel; 80214. third inner flow channel; 80215. bent flow channel; 8022. outer flow channel; 80221. first outer flow channel; 80222. second outer flow channel; 80223. third outer flow channel; 80224. fourth outer flow channel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0036] The following describes an embodiment of the utility model based on its overall structure.

[0037] A lithium battery liquid cooling structure based on vascular bionic flow channels, such as Figure 1-Figure 4As shown, it includes a battery module 1, a thermal pad 2 and a liquid cooling plate 3. The bottom of the battery module 1 is in contact with the top of the thermal pad 2, and the top of the liquid cooling plate 3 is in contact with the bottom of the thermal pad 2. The liquid cooling plate 3 is composed of an upper cooling plate 4 and a lower cooling plate 5. The upper cooling plate 4 and the lower cooling plate 5 enclose a flow channel 8 of a cooling cavity. The cooling cavity can contain a coolant, which is a water-ethylene glycol mixture. A coolant inlet 6 and a coolant outlet 7 are provided on the liquid cooling plate 3. The coolant can flow through the cooling cavity to cool the battery module 1. The surface of the upper cooling plate 4 directly serves as a part of the inner wall of the cooling cavity, and the coolant can directly The flow channel 8 includes a main flow channel 801 connected to the coolant inlet 6 and the coolant outlet 7, and a plurality of branch flow channels 802 connected to the main flow channel 801. The plurality of branch flow channels 802 are arranged in parallel, and the branch flow channels 802 are divided into two sides according to the diagonal of the lower cold plate 5. The branch flow channels on both sides are symmetrically distributed with the midpoint of the diagonal of the lower cold plate 5 as the center. The coolant flows into the flow channels around the cold plate through the inlet and radiates and branches, and then converges at the outlet to extract the heat of the battery pack. The setting of the inner and outer flow channels with different configurations balances the power of the liquid cooling plate. In order to improve the consumption and cooling effect, the flow channel groove 8 includes, in addition to the main flow channel 801 connected to the coolant inlet 6 and the coolant outlet 7, a plurality of branch flow channels 802 connected to the main flow channel 801 are arranged in parallel, and the branch flow channels 802 are divided into two sides according to the diagonal of the lower cold plate 5. The branch flow channels on both sides are symmetrically distributed with the midpoint of the diagonal of the lower cold plate 5 as the center. Based on the smoothness of bionic blood vessels, the main flow channel 801 and the branch flow channel 802 are arranged. The branch flow channel 802 is longer and has a wider flow area, which is conducive to further improving the cooling performance. The branch flow channel 802 is further divided into two types: inner and outer The two flow channels are arranged to cover the entire cold plate to ensure effective heat exchange at all parts of the cold plate. The branch flow channel 802 includes an inner flow channel 8021 and an outer flow channel 8022. The outer flow channel 8022 includes a first outer flow channel 80221, a second outer flow channel 80222, a third outer flow channel 80223 and a fourth outer flow channel 80224. The outer flow channel 8022 is arranged close to the outer side of the liquid cooling plate 3, and the outer flow channel 8022 is parallel to the outer edge of the liquid cooling plate 3. The inner flow channel 8021 is a parallel oblique flow channel. The inner flow channel 8021 is parallel to the main flow channel 801, and both ends of the inner flow channel 8021 are connected to the fourth outer flow channel 80224.The inner flow channel 8021 includes a first inner flow channel 80212, a second inner flow channel 80213, a third inner flow channel 80214, a bent flow channel 80215 of unequal width to the fourth outer flow channel 80224, and a central flow channel 80211 which is diverted from the main flow channel 801 and arranged along the diagonal direction of the liquid cooling plate 3, and the first inner flow channel 80212 and the second inner flow channel 80213 are double-branch oblique flow channels, the coolant is diverted from the main flow channel 801 to the branch fourth outer flow channel 80224, and is diverted in parallel through the fourth outer flow channel 80224, the inner and outer flow channels are set to unequal widths, and the flow of each flow channel is adjusted according to the flow resistance and impedance to ensure that the flow of each branch flow channel is evenly distributed, thereby improving the uniformity of temperature distribution of the structure. ;

[0038] See also Figure 1 In the above embodiment, the battery module 1 is formed by an array of single lithium-ion batteries, and the array arrangement can make the temperature of the single lithium-ion batteries cool more evenly.

[0039] See also Figure 1 In the above embodiment, the thermal pad 2 is a silicone thermal pad. The thermal pad 2 and the battery module 1, the thermal pad 2 and the upper cold plate 4 are connected and fixed by bonding or locking parts. The silicone thermal pad is used to realize heat conduction between the liquid cooling system and the battery module, and plays a role of filling and heat conduction.

[0040] See also Figure 3 In the above embodiment, the coolant inlet 6 and the coolant outlet 7 are arranged at both ends of the diagonal line of the liquid cooling plate 3, and are connected to the flow channel 8, which is formed by the upper cold plate 4 and the lower cold plate 5. The coolant flows into the flow channel around the cold plate through the inlet, radiates and splits, and then converges at the outlet to remove the heat of the battery pack. The diagonal arrangement of the coolant inlet 6 and the coolant outlet 7 is conducive to improving the coolant inlet and outlet flow angle, reducing the flow channel bending angle, improving heat exchange and reducing flow resistance, and reducing the power consumption of the coolant pump.

[0041] See also Figure 3-Figure 4 In the above embodiment, the flow channel 8 is formed by integral stamping of the lower cold plate 5. The lower cold plate 5 is made of a single-layer aluminum plate material, which has a simple processing technology and is more convenient to produce. In addition, the aluminum plate has good thermal conductivity.

[0042] See also Figure 2-Figure 4 In the above embodiment, the side of the lower cold plate 5 facing the upper cold plate 4 is the fitting surface, and the surrounding areas of the fitting surface and the area except the coolant flow channel are the fitting areas. The fitting area is fixedly connected to the liquid cooling plate by bonding, welding or locking parts, thereby forming a cooling cavity.

[0043] See also Figure 3In the above embodiment, the inner flow channel 8021 and the outer flow channel 8022 have different widths. The outer flow channel 8022 is longer than the inner flow channel 8021 and has a smaller width. Specifically, the outer flow channel 8022 close to the outer side of the liquid cooling plate 3 is set to a smaller width, and the parallel inner flow channel 8021 close to the center of the liquid cooling plate 3 gradually increases its width according to the distance from the center of the flow channel. The width of the inner flow channel 8021 is increased to balance the flow size of each flow channel, thereby ensuring that the flow rate of the coolant flowing into each flow channel is evenly distributed. Specifically, for the outer flow channel 8022, from the first outer flow channel 80221 to the fourth outer flow channel 80224, the flow channel width increases successively, and because the fourth outer flow channel 80224 needs to continue to divert to the central parallel flow channel, the width of the fourth outer flow channel 80224 is wider than the first outer flow channel 80221, the second outer flow channel 80222 and the third outer flow channel 80223; for the inner flow channel 8021, from the central flow channel 80211 to the three groups of parallel flow channels and then to the curved flow channel 80215 farthest from the center, the flow channel width also increases successively, ensuring the uniformity of flow distribution in the flow channels farther away. This design ensures the uniformity of flow distribution in the inner and outer flow channels, further improving the uniformity of cooling and heat dissipation effects.

[0044] See also Figure 3 In the above embodiment, the branch channel 802 is set in a circuitous manner, and a rounded corner is set at the fluid turning point for a smooth transition, and a rounded chamfer is set at the bottom of the cross section of the main channel 801 and the branch channel 802, which further reduces the flow resistance of the coolant and reduces energy consumption.

[0045] The implementation principle of the utility model is as follows: the heat generated during the operation of the lithium-ion battery module 1 is exchanged with the coolant in the cooling cavity flow channel 8 by heat conduction and heat convection through the thermal pad 2, the upper cold plate 4, the lower cold plate 5 and the flow channel 8. The coolant with a certain mass flow rate and a certain temperature flows into the liquid cooling plate 3 from the coolant inlet 6, flows and exchanges heat in each branch flow channel 802, and then converges through the coolant outlet 7 to flow out of the liquid cooling plate 3, thereby taking away the heat generated by the battery pack.

[0046] Although an embodiment of the utility model has been shown and described, this specific embodiment is only an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A lithium battery liquid cooling structure based on a vascular bionic flow channel, comprising a battery module (1), a thermal pad (2) and a liquid cooling plate (3), characterized in that: The bottom of the battery module (1) is in contact with the top of the thermal pad (2), the top of the liquid cooling plate (3) is in contact with the bottom of the thermal pad (2), the liquid cooling plate (3) is composed of an upper cooling plate (4) and a lower cooling plate (5), the upper cooling plate (4) and the lower cooling plate (5) together form a flow channel groove (8) of a cooling cavity, and the liquid cooling plate (3) is provided with a cooling liquid inlet (6) and a cooling liquid outlet (7).

2. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 1 is characterized in that: The battery module (1) is formed by arranging an array of single lithium-ion batteries.

3. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 1 is characterized in that: The thermal pad (2) is a silicone thermal pad, and the thermal pad (2) is connected and fixed to the battery module (1), the thermal pad (2) and the upper cold plate (4) by means of bonding or locking parts.

4. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 1, characterized in that: The cooling liquid inlet (6) and the cooling liquid outlet (7) are arranged at two ends of the diagonal of the liquid cooling plate (3) and are connected to the flow channel groove (8), and are formed by the upper cooling plate (4) and the lower cooling plate (5).

5. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 1 is characterized in that: The flow channel groove (8) is integrally stamped and formed by the lower cold plate (5), and the lower cold plate (5) is made of a single-layer aluminum plate material.

6. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 1, characterized in that: The side of the lower cold plate (5) facing the upper cold plate (4) is a fitting surface, and the surrounding areas of the fitting surface and the area except the cooling liquid flow channel are all fitting areas.

7. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 1 is characterized in that: In addition to the main channel (801) connected to the coolant inlet (6) and the coolant outlet (7), the flow channel groove (8) also includes a plurality of groups of branch flow channels (802) connected to the main channel (801), the plurality of groups of branch flow channels (802) are arranged in parallel, and the branch flow channels (802) are divided into two sides according to the diagonal of the lower cold plate (5), and the branch flow channels on the two sides are symmetrically distributed with the midpoint of the diagonal of the lower cold plate (5) as the center.

8. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 7 is characterized in that: The branch flow channel (802) comprises an inner flow channel (8021) and an outer flow channel (8022); the outer flow channel (8022) comprises a first outer flow channel (80221), a second outer flow channel (80222), a third outer flow channel (80223) and a fourth outer flow channel (80224); the outer flow channel (8022) is arranged close to the outer side of the liquid cooling plate (3), and the outer flow channel (8022) is parallel to the outer edge of the liquid cooling plate (3); the inner flow channel (8021) is a parallel oblique flow channel; the inner flow channel (8021) is parallel to the main flow channel (801); both ends of the inner flow channel (8021) are The inner flow channel (8021) is connected to the fourth outer flow channel (80224); the inner flow channel (8021) comprises a first inner flow channel (80212), a second inner flow channel (80213), a third inner flow channel (80214), a bent flow channel (80215), and a central flow channel (80211) which is arranged along the diagonal direction of the liquid cooling plate (3) after being branched from the main flow channel (801), and the first inner flow channel (80212) and the second inner flow channel (80213) are double-branched oblique flow channels, and the cooling liquid is branched from the main flow channel (801) to the branched fourth outer flow channel (80224), and is branched in parallel through the fourth outer flow channel (80224).

9. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 8, characterized in that: The inner flow channel (8021) and the outer flow channel (8022) have different widths, and the outer flow channel (8022) is longer than the inner flow channel (8021).

10. The lithium battery liquid cooling structure based on vascular bionic flow channel according to claim 8, characterized in that: The branch flow channel (802) is arranged in a circuitous manner, and a rounded corner is arranged at the fluid turning point for a smooth transition, and a rounded chamfer is arranged at the bottom of the cross section of the main flow channel (801) and the branch flow channel (802).

Images