Liquid cooling plate and battery system with liquid cooling plate

Abstract

The utility model relates to a liquid cooling plate and a battery system with the liquid cooling plate, the liquid cooling plate comprises a liquid cooling runner plate and a liquid cooling upper plate, and a liquid inlet, a liquid outlet and a liquid runner are arranged on one surface of the liquid cooling runner plate attached to the liquid cooling upper plate; the liquid flow channel comprises at least two groups of water inlet flow channels, a rotary flow channel and at least two groups of water outlet flow channels, the liquid inlet and the liquid outlet are positioned on the same side of the liquid cooling flow channel plate, each water inlet flow channel is parallel to each water outlet flow channel, a first end of each water inlet flow channel is connected with the liquid inlet, a first end of each water outlet flow channel is connected with the liquid outlet, and a second end of each water outlet flow channel is connected with the liquid outlet. The rotation flow channel is communicated with the second ends of the water inlet flow channels and the second ends of the water outlet flow channels, and a plurality of first water resistance pieces are arranged in the rotation flow channel. The liquid cooling plate and the battery system with the liquid cooling plate have the characteristics of being reasonable in design, capable of effectively achieving a uniform heat dissipation effect and good in adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management, in particular to the technical field of liquid cooling, and specifically to a liquid cooling plate and a battery system with the liquid cooling plate. Background Art

[0002] When the temperature of some devices in the prior art rises, the high temperature will not only affect the working performance of the device, but also bring great safety hazards to the entire device. For example:

[0003] With the shortage of traditional energy and the increasing prominence of environmental problems, new energy sources have gradually attracted the attention of all walks of life. However, many energy sources cannot be used directly after they are generated or can be directly generated when needed. Therefore, it is generally necessary to convert the relevant energy into easier-to-store electrical energy before storage and use. The development of energy storage has become a hot topic of concern. As the core component of energy storage equipment, the importance of battery pack safety cannot be ignored. The internal temperature of the battery pack directly affects its safety, and then affects the safety of the entire equipment. The appropriate operating temperature is an important factor in improving the performance and safety of the battery pack. To improve the safety of the battery pack, it is necessary to control the temperature of its internal structure.

[0004] Therefore, it is particularly important to design a reasonable cooling system for this type of equipment.

[0005] Since liquid has certain fluidity and heat absorption, in order to ensure effective cooling of the equipment, liquid cooling is usually used in the prior art to dissipate heat for the equipment. For example, when cooling the temperature of the battery cell, combined with the characteristics of the stamped liquid cooling plate, such as flexible flow channel design, fewer parts in the battery pack, and low leakage risk, the stamped liquid cooling plate is usually the preferred liquid cooling method for energy storage equipment.

[0006] However, Figure 1 For example, in the mainstream cooling system on the market, the flow cross-section of each part of the water-cooled plate flow channel from the inlet to the outlet is usually designed with equal area. Although this cooling method can meet the heat dissipation needs of some equipment, for high-capacity batteries, the heat generated by IC charging and discharging is often large. Under the model and specification restrictions of the water pump, the flow rate at the liquid inlet is certain. Due to the long flow channel, the temperature of the coolant gradually increases along the flow direction when it flows through the water-cooled plate. In this way, the cooling ability of the coolant along the flow direction will gradually decrease, which will inevitably lead to a temperature difference between the batteries in the water inlet area and the water outlet area of ​​the water-cooled plate. Excessive temperature difference will damage the performance of the battery and shorten its service life.

[0007] Therefore, there is an urgent need for a method that can solve the problem that due to unreasonable cooling plate structure design, the cooling medium cannot achieve uniform heat dissipation during the flow process, resulting in low temperature uniformity of the device to be cooled. Utility Model Content

[0008] The utility model aims to solve at least one of the technical problems existing in the prior art. The utility model provides a liquid cooling plate with reasonable structural design, which can effectively achieve uniform heat dissipation, better dissipate heat for equipment, reduce the impact of temperature difference factors on equipment performance and service life, and has good applicability. To this end, the utility model also provides a battery system with a liquid cooling plate.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] In a first aspect of the present invention, a liquid cooling plate is provided, comprising:

[0011] A liquid-cooling flow channel plate, wherein the liquid-cooling flow channel plate is provided with a liquid inlet, a liquid outlet and a liquid flow channel formed by a recessed structure on the liquid-cooling flow channel plate; the liquid flow channel comprises at least two groups of water inlet flow channels, a rotating flow channel and at least two groups of water outlet flow channels, the liquid inlet and the liquid outlet are located on the same side of the liquid-cooling flow channel plate, each of the water inlet flow channels is arranged in parallel with each of the water outlet flow channels, the first end of each of the water inlet flow channels is connected to the liquid inlet, the first end of each of the water outlet flow channels is connected to the liquid outlet, the rotating flow channel is connected to the second end of each of the water inlet flow channels and the second end of each of the water outlet flow channels, and a plurality of first water resistance members are arranged in the rotating flow channel;

[0012] A liquid-cooled upper plate is covered on the liquid-cooled flow channel plate to close the liquid flow channel.

[0013] In the above-mentioned liquid cooling plate, the parts of the surface of the liquid cooling channel plate facing the liquid cooling upper plate except the liquid inlet, the liquid outlet and the liquid channel are all in contact with the liquid cooling upper plate.

[0014] In the above-mentioned liquid cooling plate, each group of the water inlet flow channels is separated by a first main dividing rib, and each group of the water outlet flow channels is separated by a second main dividing rib.

[0015] The above-mentioned liquid cooling plate, wherein the liquid flow channel comprises two groups of the water inlet flow channels;

[0016] The first end of the first main dividing rib extends to the position of the liquid inlet to form a water inlet fork at the position where the liquid inlet connects the two groups of the water inlet flow channels;

[0017] The first main dividing rib is also provided with a guide portion, and the guide portion is formed by a branch extending from the first end of the first main dividing rib toward any group of the water inlet flow channels.

[0018] The above-mentioned liquid cooling plate, wherein the liquid flow channel comprises two groups of the water outlet flow channels;

[0019] The first end of the second main dividing rib extends to the position of the liquid outlet to form a water outlet fork at the position where the liquid outlet connects the two groups of the water outlet channels;

[0020] The second main dividing rib is also provided with a backflow prevention portion, and the backflow prevention portion is formed by a branch extending from the first end of the second main dividing rib toward any group of the water outlet flow channels.

[0021] The above-mentioned liquid cooling plate, wherein the backflow prevention portion is formed by a branch extending from the first end of the second main dividing rib toward the water outlet channel near the edge of the liquid cooling channel plate, and the backflow prevention portion is perpendicular to the main trunk of the second main dividing rib.

[0022] The above-mentioned liquid cooling plate, wherein each of the water inlet channels comprises a plurality of branch water inlet channels arranged in parallel and separated by at least one first dividing rib;

[0023] Each of the water outlet channels comprises a plurality of branch water outlet channels arranged in parallel and separated by at least one second dividing rib.

[0024] The above-mentioned liquid cooling plate, wherein, at least one second water resistance member is provided at a position of the liquid cooling main channel in each of the water inlet channels which is close to the liquid inlet and is not divided into a plurality of the branch water inlet channels.

[0025] The above-mentioned liquid cooling plate, wherein the liquid flow channel comprises two groups of the water inlet flow channels;

[0026] Among them, one second water resistance member is provided in the water inlet channel near the edge side of the liquid-cooling channel plate, and two second water resistance members are provided in the water inlet channel near the middle side of the liquid-cooling channel plate.

[0027] The above-mentioned liquid cooling plate, wherein the length of one of the second water resistance members arranged in the water inlet channel close to the edge side of the liquid cooling channel plate accounts for 13% to 17% of the length of the water inlet channel;

[0028] The total length of the two second water resistance members arranged in the water inlet channel close to the middle side of the liquid-cooling channel plate accounts for 23% to 27% of the length of the water inlet channel.

[0029] The above-mentioned liquid cooling plate, wherein the plurality of the first water resistance members in the rotating flow channel are distributed in the rotating flow channel at positions adjacent to the second end of the water inlet flow channel, or

[0030] The several first water resistance members in the rotating flow channel include: a plurality of water inlet first water resistance members adjacent to the second end of the water inlet flow channel and a plurality of water outlet first water resistance members adjacent to the second end of the water outlet flow channel, and the water blocking force of the water inlet first water resistance members is greater than the water blocking force of the water outlet first water resistance members.

[0031] In the above liquid cooling plate, when the plurality of first water resistance members include a plurality of the water inlet first water resistance members and a plurality of the water outlet first water resistance members, the length of the water inlet first water resistance member is longer than the length of the water outlet first water resistance member.

[0032] In a second aspect of the utility model, a battery system with a liquid cooling plate is provided, comprising the above-mentioned liquid cooling plate and a battery module, wherein the battery module is arranged in contact with a liquid cooling upper plate in the liquid cooling plate.

[0033] Compared with the prior art, the liquid cooling plate and the battery system with the liquid cooling plate of the utility model have the following beneficial effects:

[0034] The utility model provides a liquid cooling plate, comprising a liquid cooling upper plate and a liquid cooling channel plate, on which the following components are stamped:

[0035] (1) Set up a water inlet fork so that the flow rate of the two diverted water channels is uniform, thereby achieving the purpose of uniform heat absorption.

[0036] (2) A plurality of first water resistance members are arranged at intervals in the rotating flow channel to achieve:

[0037] 1) The water blocking force of the first water blocking member decreases along the flow direction of the coolant, slowing down the flow velocity at the front end and increasing the flow velocity at the rear end;

[0038] 2) Since the heat absorption efficiency of solids is greater than that of liquids, the solid contact surface is increased, thereby increasing the heat absorption area;

[0039] 3) When the coolant in the water inlet channels of each branch flows into the rotating channel, backflow will occur. Arranging a plurality of first water resistance members has a flow guiding effect to prevent backflow.

[0040] (3) A second water resistance member is provided near the liquid inlet in each water inlet channel to reduce the flow velocity at the front end of the corresponding water inlet channel and balance the overall flow velocity.

[0041] (4) Set up multiple water channels at the rear end to increase the heat absorption area.

[0042] (5) A backflow prevention portion is provided to prevent backflow and divert the flow. Since the heat absorption efficiency of solids is greater than that of liquids, the backflow prevention portion is also used to increase the heat absorption efficiency, balance the overall flow rate and thus balance the temperature of the entire liquid cooling plate, so that the temperature of the battery module reaches consistency, greatly improving the service life of the battery module.

[0043] The water distribution channels, water resistance components and multiple water channels of the liquid cooling plate work together to reduce the temperature difference and temperature rise of the battery module.

[0044] The battery system with a liquid cooling plate provided in the utility model enables the temperature of the battery module to reach consistency, thereby greatly improving the service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0046] Figure 1 It is a structural schematic diagram of a liquid cooling channel plate in a liquid cooling plate in the prior art.

[0047] Figure 2 It is a structural schematic diagram of a liquid cooling plate in one embodiment of the utility model.

[0048] Figure 3 It is an exploded view of a liquid cooling plate in one embodiment of the utility model.

[0049] Figure 4 It is a structural schematic diagram of a liquid cooling channel plate in a liquid cooling plate in an embodiment of the utility model.

[0050] Figure 5 It is a structural schematic diagram of a battery system with a liquid cooling plate in one embodiment of the utility model.

[0051] Figure 6 It is a structural schematic diagram of a liquid cooling plate in the prior art.

[0052] Figure 7 is based on Figure 6 The corresponding simulated battery module model diagram obtained by modeling the liquid cooling plate in .

[0053] Figure 8 yes Figure 6 Pressure distribution diagram of the liquid cooling plate in .

[0054] Fig. 9 yes Figure 6 Flow trajectory diagram of the liquid cooling plate in .

[0055] Fig.10 yes Figure 7 Battery module utilization Figure 6 Temperature distribution diagram when the liquid cooling plate in the cooling system is dissipating heat.

[0056] Fig.11 is based on Figure 4 The corresponding simulated battery module model diagram obtained by modeling the liquid cooling plate in .

[0057] Fig.12 yes Figure 4 Pressure distribution diagram of the liquid cooling plate in .

[0058] Fig.13 yes Figure 4 Flow trajectory diagram of the liquid cooling plate in .

[0059] Fig.14 yes Fig.11 Battery module utilization Figure 4 Temperature distribution diagram when the liquid cooling plate in the cooling system is dissipating heat.

[0060] Reference numerals

[0061] 1 Liquid cooling plate

[0062] 11 Liquid cooling runner plate

[0063] 111 Liquid inlet

[0064] 112 liquid outlet

[0065] 113 Inlet channel

[0066] 1131 Branch water inlet channel

[0067] 114 Rotating channel

[0068] 115 Water outlet channel

[0069] 1151 Branch outlet channel

[0070] 116 first water resistance

[0071] 117 First main dividing reinforcement

[0072] 118 Second main dividing reinforcement

[0073] 119 Water Intake Fork

[0074] 1110 diversion part

[0075] 1111 Water outlet

[0076] 1112 Backflow prevention unit

[0077] 1113 The first splitting bar

[0078] 1114 The second dividing bar

[0079] 1115 Second water resistance

[0080] 12 liquid cooling upper plate

[0081] 13 Water inlet connector

[0082] 14 Water outlet connector

[0083] 2 Battery Module DETAILED DESCRIPTION

[0084] In order to make the technical means, creative features, objectives and effects of the utility model easier to understand, the utility model is further described below with reference to specific diagrams. However, the utility model is not limited to the following implementation cases.

[0085] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present utility model can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present utility model without affecting the effects and purposes that can be achieved by the present utility model.

[0086] like Figures 2 to 4 As shown, the liquid cooling plate 1 in this embodiment includes a liquid cooling channel plate 11 and a liquid cooling upper plate 12, and the liquid cooling upper plate 12 is covered on the liquid cooling channel plate 11, wherein: Figure 4 The arrows in the figure indicate the direction of liquid flow.

[0087] The liquid cooling channel plate 11 is provided with a liquid inlet 111, a liquid outlet 112 and a liquid channel formed by a recessed structure on the liquid cooling channel plate 11;

[0088] In this embodiment, only a raised or recessed structure is provided on the liquid-cooled channel plate 11 to form a liquid channel for the circulation of the coolant, and the liquid-cooled upper plate 12 is a flat plate structure. The cross-section of the liquid channel in the liquid-cooled plate 1 in this embodiment is a semicircular channel cross-section with an arc downward. In another embodiment, a raised or recessed circuit structure for the circulation of the coolant may also be provided in the liquid-cooled upper plate 12, so that the cross-section of the coolant circulation circuit of the liquid-cooled plate 1 is a circular channel cross-section consisting of an upper and lower semicircle. This embodiment does not limit the cross-sectional shape of the coolant circulation circuit of the liquid-cooled plate 1 in the utility model.

[0089] The liquid flow channel includes two groups of water inlet flow channels 113, a rotating flow channel 114 and two groups of water outlet flow channels 115;

[0090] Each group of water inlet channels 113 is separated by a first main dividing rib 117, and a first end of the first main dividing rib 117 extends to the position of the liquid inlet 111 to form a water inlet fork 119 at the position where the liquid inlet 111 connects the two groups of water inlet channels 113;

[0091] In this embodiment, the first end of the first main dividing rib 117 is in a pointed structure to achieve a better flow diversion and guiding effect and to play a role in slowing down the flow.

[0092] The first main dividing rib 117 is also provided with a guide portion 1110, which is formed by a branch extending from the first end of the first main dividing rib 117 toward any group of water inlet channels 113. In this embodiment, the guide portion 1110 is formed by a branch extending from the first end of the first main dividing rib 117 toward the water inlet channel 113 near the lower side of the liquid-cooling channel plate 11.

[0093] Each group of water outlet channels 115 is separated by a second main dividing rib 118, and a first end of the second main dividing rib 118 extends to the position of the liquid outlet 112 to form a water outlet fork 1111 at the position where the liquid outlet 112 connects the two groups of water outlet channels 115;

[0094] In this embodiment, the first end of the second main dividing rib 118 is in a pointed structure to better achieve the guiding effect.

[0095] The second main dividing rib 118 is also provided with a backflow prevention portion 1112, which is formed by a branch extending from the first end of the second main dividing rib 118 toward any group of water outlet channels 115. In this embodiment, the backflow prevention portion 1112 is formed by a branch extending from the first end of the second main dividing rib 118 toward the water outlet channels 115 near the upper side of the liquid cooling channel plate 11.

[0096] like Figure 4 As shown, in this embodiment, the backflow prevention portion 1112 is formed by a branch extending from the first end of the second main dividing rib 118 toward the water outlet channel 115 near the edge of the liquid cooling channel plate 11, and the backflow prevention portion 1112 is perpendicular to the main trunk of the second main dividing rib 118.

[0097] In this embodiment, the liquid inlet 111 and the liquid outlet 112 are located on the same side of the liquid cooling channel plate 11, each water inlet channel 113 is arranged in parallel with each water outlet channel 115, the first end of each water inlet channel 113 is connected to the liquid inlet 111, the first end of each water outlet channel 115 is connected to the liquid outlet 112, and the rotating channel 114 connects the second end of each water inlet channel 113 and the second end of each water outlet channel 115.

[0098] A plurality of first water resistance members 116 are provided in the rotating flow channel 114, wherein the plurality of first water resistance members 116 in the rotating flow channel 114 include: a plurality of water inlet first water resistance members adjacent to the second end of the water inlet flow channel 113 and a plurality of water outlet first water resistance members adjacent to the second end of the water outlet flow channel 115, and the water blocking force of the water inlet first water resistance members is greater than the water blocking force of the water outlet first water resistance members.

[0099] In a preferred embodiment, the length of the first water inlet water resistance member is longer than that of the first water outlet water resistance member. A plurality of first water inlet water resistance members are evenly spaced and distributed at positions adjacent to the second end of the water inlet flow channel 113, and a plurality of first water outlet water resistance members are evenly spaced and distributed at positions adjacent to the second end of the water outlet flow channel 115. In other embodiments, the water blocking force of the first water inlet water resistance member may be greater than that of the first water outlet water resistance member by other means.

[0100] In a preferred embodiment, two first water inlet water resistance members and three first water outlet water resistance members may be provided to make the temperature distribution of the cooling liquid more uniform. However, the actual application is not limited thereto.

[0101] In other embodiments, a plurality of first water resistance members 116 may be arranged at intervals in the rotating flow channel 114 adjacent to the second end of the water inlet flow channel 113 , and the first water resistance member 116 may not be arranged in the rotating flow channel 114 adjacent to the second end of the water outlet flow channel 115 .

[0102] At least one second water resistance member 1115 is disposed at a position close to the liquid inlet 111 in each water inlet channel 113 .

[0103] like Figure 4 As shown, each water inlet channel 113 includes a plurality of branch water inlet channels 1131 arranged in parallel and separated by at least one first dividing rib 1113;

[0104] Each water outlet channel 115 includes a plurality of branch water outlet channels 1151 arranged in parallel and separated by at least one second dividing rib 1114 .

[0105] The liquid cooling upper plate 12 is used to close the liquid flow channel.

[0106] In this embodiment, the parts of the liquid-cooling channel plate 11 facing the liquid-cooling upper plate 12 except the liquid inlet 111, the liquid outlet 112 and the liquid flow channel are all in contact with the liquid-cooling upper plate 12 to better achieve heat conduction. However, in other embodiments, considering the processing technology or other factors, some parts of the liquid-cooling channel plate 11 facing the liquid-cooling upper plate 12 except the liquid flow channel may not be in contact with the liquid-cooling upper plate 12.

[0107] In the above embodiment, the liquid-cooling channel plate 11 and the liquid-cooling upper plate 12 are both made of a good thermal conductor material (ie, a material with good thermal conductivity), such as a metal material such as aluminum.

[0108] The liquid cooling plate 1 in the above embodiment can be manufactured by the following liquid cooling plate 1 manufacturing method, which includes:

[0109] The liquid cooling channel plate 11 with the liquid inlet 111, the liquid outlet 112 and the liquid channel is produced by stamping a metal plate or extruding a metal material;

[0110] The liquid cooling upper plate 12 is covered on the side of the liquid cooling channel plate 11 where the liquid channel is provided, and the liquid cooling upper plate 12 and the liquid cooling channel plate 11 are connected by brazing.

[0111] In other embodiments, other methods may be used to manufacture the liquid-cooling channel plate 11 , and other methods may be used to seal and connect the liquid-cooling upper plate 12 and the liquid-cooling channel plate 11 .

[0112] The liquid cooling plate manufactured by the above-mentioned liquid cooling plate manufacturing method has the advantages of being easy to produce and avoiding liquid leakage.

[0113] The liquid cooling plate 1 in the above-mentioned embodiment can be applied to the field of lithium battery manufacturing technology to form a battery system with the liquid cooling plate 1 .

[0114] The battery cell is the smallest unit of the battery and also the energy storage unit. It must have a high energy density to store as much energy as possible. In addition, the life of the battery cell is also the most critical factor. The damage of any battery cell will cause damage to the entire battery pack. When multiple battery cells are packaged together in the same outer shell frame and connected to the outside through a unified boundary, this forms a battery module 2. When several battery modules 2 are jointly controlled or managed by the battery management system and the thermal management system, this unified whole is called a battery pack.

[0115] Because the process of charging and discharging the battery pack is actually a process of chemical reaction, the chemical reaction will release a lot of heat. At this time, the heat needs to be taken away to keep the battery pack in a reasonable operating temperature range to improve the life and reliability of the battery pack. Due to the existence of the internal resistance of the battery and the impedance of the electrical connection components, under the conditions of charging and discharging, the internal cells of the battery module 2 constituting the battery pack will heat up. The greater the current, the greater the heat generated. If the internal heat cannot be dissipated in time, the life of the battery pack will be affected at the least, causing the service life of the battery pack to decay rapidly, and at the worst, it will cause thermal runaway of the battery module 2 and the battery pack, bringing safety problems.

[0116] Because temperature is very important for the use and life of the battery pack, a liquid cooling plate 1 needs to be provided inside the battery box when used, so as to cool down the battery module 2 in the battery pack in a timely and rapid manner.

[0117] like Figure 5 As shown, the battery system includes the liquid cooling plate 1 and the battery module 2 in the above embodiment, and the battery module 2 is arranged in close contact with the liquid cooling upper plate 12 in the liquid cooling plate 1, so that the liquid cooling upper plate 12 absorbs the heat transmitted from the battery module 2 and cools it.

[0118] The battery system using the liquid cooling plate 1 in the above embodiment can effectively reduce the temperature difference and temperature rise between the battery cells at the water inlet area and the battery cells at the water outlet area of ​​the liquid cooling channel plate 11, and effectively avoid the problem that excessive temperature difference and temperature rise damage the performance of the battery and shorten its service life.

[0119] Among them, through the coordinated design of the flow channels, water resistance parts and various dividing rib structures separated and arranged on the liquid-cooling flow channel plate 11, the water flow in each main flow channel can be guaranteed to be relatively uniform, which is not only beneficial to improving the heat equalization function of the liquid cooling plate 1, but also can improve the heat dissipation effect of the liquid cooling plate 1, effectively balance the temperature of the entire liquid cooling plate 1, and work together to reduce the temperature difference and temperature rise of the battery module 2, so that the temperature inside the battery module 2 is relatively uniform, which greatly improves the service life of the battery module 2, thereby expanding its scope of application and improving the competitiveness of the product.

[0120] In order to enable those skilled in the art to better understand the present solution, the structural design principle and effect of the liquid cooling plate 1 in the above embodiment are further described below:

[0121] In the above embodiment, by setting the first main dividing rib 117, the recessed structure connected to the liquid inlet 111 on the liquid cooling channel plate 11 is separated into multiple groups of water inlet channels 113, so as to divert the liquid entering the liquid channel from the liquid inlet 111, wherein the first end of the first main dividing rib 117 extends to the position of the liquid inlet 111 to form a water inlet fork 119, so that the flow rate of the two diverted water channels is uniform, thereby achieving the purpose of uniform heat absorption.

[0122] By setting the second main dividing rib 118, the recessed structure of the liquid-cooling flow channel plate 11 connected to the liquid outlet 112 is divided into multiple groups of water outlet channels 115. The first end of the second main dividing rib 118 extends to the position of the liquid outlet 112, and a water outlet fork 1111 is formed at the position where the liquid outlet 112 connects the two groups of water outlet channels 115, so that the fluid can flow through the multiple groups of water outlet channels 115 to the water outlet fork 1111 and then flow to the liquid outlet 112 after merging. The anti-backflow portion 1112 formed by the branch extending from the first end of the second main dividing rib 118 to the direction of any group of water outlet channels 115 has the effect of preventing backflow and diverting flow. Since the heat absorption efficiency of solids is greater than that of liquids, the anti-backflow portion 1112 is also used to increase the heat absorption efficiency of the liquid cooling plate 1, balance the overall flow rate and thus balance the temperature of the entire liquid cooling plate 1. When the liquid cooling plate 1 with this structure is attached to the battery module 2 , the temperature of the battery module 2 can be made consistent, thereby greatly improving the service life of the battery module 2 .

[0123] In the above embodiment, since the water inlet channel 113 is perpendicular to the rotating channel 114, when the fluid flows from the water inlet channels 1131 of each branch to the rotating channel 114, if the fluid directly rushes to the tube wall of the rotating channel 114, backflow will occur. Therefore, by setting a plurality of first water resistance members 116 in the rotating channel 114, since the first water resistance members 116 in this embodiment are arranged in the rotating channel 114 rather than on the side of the rotating channel 114, and there is a certain distance between each first water resistance member 116, the first water resistance member 116 is arranged to guide the flow and prevent the backflow from occurring after the fluid flows through the water inlet channel 113 to the rotating channel 114 and contacts the side of the rotating channel 114, thereby effectively smoothing the water flow.

[0124] Taking into account that the fluid in the rotating flow channel 114 flows in the direction from the water inlet flow channel 113 to the water outlet flow channel 115, in the above embodiment, the length of each water inlet first water resistance member adjacent to the second end of the water inlet flow channel 113 in the rotating flow channel 114 is designed to be longer than the length of each water outlet first water resistance member adjacent to the second end of the water outlet flow channel 115, and the longer water inlet first water resistance member is evenly distributed at the position adjacent to each water inlet flow channel 113 in the rotating flow channel 114, and the shorter water outlet first water resistance member is evenly distributed at the position adjacent to each water outlet flow channel 115 in the rotating flow channel 114, so that the water blocking force of the several first water resistance members 116 is reduced along the direction of the coolant flow, the flow velocity at the front end of the rotating flow channel 114 is slowed down and the flow velocity at the rear end of the rotating flow channel 114 is increased, so that the flow velocity of the fluid in the liquid flow channel is more balanced.

[0125] In the above embodiment, at least one second water resistance member 1115 is provided in each water inlet channel 113 near the liquid inlet 111 to slow down the flow rate of the liquid entering the liquid channel from the liquid inlet 111, thereby achieving the effect of balancing the overall flow rate.

[0126] Since the heat absorption efficiency of solids is greater than that of liquids, the first water resistance member 116, the second water resistance member 1115, the first main dividing rib 117, the second main dividing rib 118 and other non-recessed structural parts in the above embodiment can effectively improve the heat absorption efficiency of the liquid cooling plate 1 after being bonded to the liquid cooling upper plate 12. For example, by designing each water inlet channel 113 as a plurality of branch water inlet channels 1131 arranged in parallel and separated by at least one first branch dividing rib 1113, and designing each water outlet channel 115 as a plurality of branch water outlet channels 1151 arranged in parallel and separated by at least one second branch dividing rib 1114, the heat absorption area can be effectively increased by increasing the bonding surface between the liquid cooling channel plate 11 and the liquid cooling upper plate 12.

[0127] At the same time, in the above embodiment, the water channel is diverted by the first main dividing rib 117, the second main dividing rib 118, the first branch dividing rib 1113 and the second branch dividing rib 1114, so that the liquid cooling channel plate 11 can be formed by an integrally formed structure, thereby effectively reducing the production cost of the liquid cooling plate 1, reducing the process difficulty, and effectively ensuring the service life of the equipment.

[0128] like Figure 2 and Figure 4 As shown, the positions of the liquid inlet 111 and the liquid outlet 112 of the liquid cooling plate 1 are respectively connected to the water inlet joint 13 and the water outlet joint 14. In this embodiment, the water inlet joint 13 and the water outlet joint 14 are both arranged on the liquid cooling upper plate 12. In other embodiments, the water inlet joint 13 and the water outlet joint 14 can also be selected to be arranged at positions corresponding to the liquid inlet 111 and the liquid outlet 112 in the liquid cooling channel plate 11.

[0129] When in use, the coolant enters the liquid cooling plate 1 from the water inlet joint 13 and flows into the liquid flow channel through the liquid inlet 111. The coolant in the liquid flow channel absorbs the heat of the battery module 2, and is discharged from the water outlet joint 14 through the liquid outlet 112 after the temperature rises.

[0130] The liquid cooling upper plate 12 in the above embodiment can be made by punching a flat sheet metal. Punching is a basic stamping process that uses a mold to separate materials. It can directly make flat parts or prepare blanks for other stamping processes such as bending, drawing, forming, etc. It can also be used to cut and trim the formed stamped parts. Punching accounts for about 50% to 60% of the entire stamping process.

[0131] The liquid cooling channel plate 11 is made by stamping sheet metal, thus avoiding the problem of liquid leakage.

[0132] The liquid cooling channel plate 11 is provided with relatively raised or recessed structures to form the shape of a cooling liquid circulation loop. The liquid cooling upper plate 12 and the liquid cooling channel plate 11 are similar in size, so that the two can be sealed and connected by brazing to form the liquid cooling plate 1 together.

[0133] Brazing refers to a welding method in which the solder and the weldment, which are lower than the melting point of the weldment, are heated to the melting temperature of the solder at the same time, and the gap of the solid workpiece is filled with liquid solder to connect the metals. Brazing has small deformation and smooth and beautiful joints. It is suitable for welding precise, complex and components composed of different materials, such as honeycomb structure plates, turbine blades, carbide tools and printed circuit boards. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove oil stains and excessively thick oxide films to ensure the interface assembly gap. The gap is generally required to be between 0.01 and 0.1 mm. Compared with fusion welding, the base material does not melt during brazing, only the brazing material melts; compared with pressure welding, no pressure is applied to the weldment during brazing. The weld formed by brazing is called a brazing seam. The filler metal used for brazing is called a brazing filler metal.

[0134] The liquid cooling channel plate 11 in this embodiment is provided with a liquid inlet 111 , a liquid outlet 112 , a water inlet fork 119 , a water outlet fork 1111 , two groups of water inlet channels 113 , two groups of water outlet channels 115 and a rotary channel 114 .

[0135] The two groups of water inlet channels 113 are respectively a first water inlet channel and a second water inlet channel, wherein the first water inlet channel is close to the middle of the liquid cooling channel plate 11, and the second water inlet channel is close to the lower edge of the liquid cooling channel plate 11. The first water inlet channel is divided into three first branch water inlet channels, and the second water inlet channel is divided into three second branch water inlet channels;

[0136] like Figure 4 As shown, the flow direction of the coolant flows from the liquid inlet 111 and the water inlet fork 119 to each first branch water inlet channel and the second branch water inlet channel in turn, and the coolant in each first branch water inlet channel and the second branch water inlet channel flows to the rotating channel 114 respectively, and the liquid in the rotating channel 114 flows to each first branch water outlet channel and the second branch water outlet channel, and converges at the water outlet fork 1111, and finally flows out from the liquid outlet 112.

[0137] When the structure is applied to a battery system, the design of the water inlet branch 119 enables the liquid cooling channel plate 11 to have a symmetrically arranged water inlet channel 113. The symmetrically arranged branch channels can slow down the flow rate of the water inlet and thus balance the temperature of the entire liquid cooling plate 1. The symmetrically arranged branch channels can also ensure that the water flow rates of the first water inlet channel and the second water inlet channel are the same, thereby achieving uniform heat absorption and balancing the temperature of the first branch water inlet channel and the second branch water inlet channel area, so that the temperature of the battery module 2 is consistent, thereby greatly improving the service life of the battery module 2.

[0138] In this embodiment, the guide part 1110 is arranged on the side facing the second water inlet channel, wherein two second water resistance members 1115 are arranged at the position of the first water inlet channel near the water inlet fork 119, and a second water resistance member 1115 is arranged between the guide part 1110 and the first dividing rib 1113 in the second water inlet channel. When the second water resistance member 1115 composed of a protrusion relative to the liquid flow channel is arranged in the first water inlet channel and the second water inlet channel, the flow rate of the coolant in the liquid inlet 111 area can be effectively slowed down, the overall flow rate can be balanced, and then the temperature of the entire liquid cooling plate 1 can be balanced.

[0139] The design of the number of second water resistance members 1115 can affect the heat dissipation effect and the effect of buffering the flow rate. A more optimal design scheme is provided in this embodiment. If the number of second water resistance members 1115 is further increased, the heat dissipation effect may be deteriorated, while if the number of second water resistance members 1115 is reduced, the buffering flow rate effect that can be achieved currently may not be achieved.

[0140] Since the second water resistance member 1115 is disposed at a position of the liquid flow channel close to the liquid inlet, it can better absorb heat from the relevant area, thereby further balancing the temperature among the entire areas of the liquid cooling plate 1 .

[0141] Among them, the length of a second water resistance member 1115 arranged in the water inlet channel near the edge side of the liquid-cooling runner plate accounts for 13% to 17% of the length of the water inlet channel. In the optimal embodiment, the length of a second water resistance member 1115 arranged in the water inlet channel near the edge side of the liquid-cooling runner plate accounts for 15% of the length of the water inlet channel; the total length of the two second water resistance members 1115 arranged in the water inlet channel near the middle side of the liquid-cooling runner plate accounts for 23% to 27% of the length of the water inlet channel. In the optimal embodiment, the total length of the two second water resistance members 1115 arranged in the water inlet channel near the middle side of the liquid-cooling runner plate accounts for 25% of the length of the water inlet channel. Among them, the two second water resistance members 1115 near the middle side of the liquid-cooling runner plate are arranged side by side along the axial direction of the water inlet channel, and the two second water resistance members 1115 are separated by a preset distance, such as Figure 4 As shown, the total length of the two second water blocking members 1115 is the total length of the length of the two second water blocking members 1115 plus the distance between the two second water blocking members 1115 .

[0142] Such a size ratio design can reduce the temperature difference between the liquid inlet and the liquid outlet of the liquid cooling plate during the heat dissipation process, effectively ensuring more balanced heat dissipation of battery cells at various locations.

[0143] In a specific application, a protrusion with a relatively smooth edge can be used to form the second water resistance member 1115, such as Figure 4 The rounded rectangular convex block in the figure constitutes the second water blocking member 1115, and a circular or other convex member with smooth edges may also be selected to constitute the second water blocking member 1115. This embodiment does not limit the shape of the second water blocking member 1115 in the technical solution.

[0144] The area of ​​the water area in the water inlet channel 1131 that is not divided into multiple branches in the water inlet channel 113 is larger than the area of ​​the water area in the water inlet channel 1131 that is divided into multiple branches in the water inlet channel 113 and the liquid-cooled upper plate 12. This arrangement can increase the heat absorption of each branch water inlet channel 1131. As the coolant flows from the main channel of each water inlet channel 113 into the corresponding branch water inlet channels 1131, the temperature of the coolant rises due to heat absorption and the heat absorption capacity decreases. Here, increasing the area of ​​the water area in each branch water inlet channel 1131 in contact with the liquid-cooled upper plate 12 can balance the regional temperature difference caused by the increase in the coolant temperature and reduce the temperature difference between the main channel and the branch in each water inlet channel 113.

[0145] The liquid cooling channel plate 11 in this embodiment is provided with two water inlet channels 113, and each water inlet channel 113 is divided into three branch water inlet channels 1131. The number of channels is designed here for a better heat dissipation option, but in actual applications it does not limit the number of water inlet channels 113 and branch water inlet channels 1131.

[0146] In the rotating flow channel 114 in the above embodiment, five first water resistance members 116 are arranged in sequence along the flow direction of the coolant, wherein the water resistance of the first water resistance member 116 is reduced along the flow direction of the coolant by designing a change in the length of each first water resistance member 116. The setting of the first water resistance member 116 can slow down the flow velocity in the water inlet area and increase the flow velocity in the water outlet area, thereby balancing the overall flow velocity and then balancing the temperature of the entire liquid cooling plate 1.

[0147] In this embodiment, a waist-shaped protrusion is used to form the first water resistance member 116, but the present invention is not limited thereto. In other embodiments, other protrusions with backflow prevention and guiding functions may be used to form the first water resistance member 116.

[0148] The two groups of water outlet channels 115 are respectively the first water outlet channel and the second water outlet channel, wherein the first water outlet channel is close to the upper edge of the liquid cooling channel plate 11, and the second water outlet channel is close to the middle of the liquid cooling channel plate 11. Three first branch water outlet channels are separated in the first water outlet channel, and three second branch water outlet channels are separated in the second water inlet channel. In this embodiment, the anti-backflow portion 1112 is arranged on the side facing the first water outlet channel. The axis of the anti-backflow portion 1112 is at a 90-degree angle with the axis of each branch water outlet channel 1151, which is used to hinder the reflux of the coolant and increase the flow rate. Since the heat absorption efficiency of the solid is greater than that of the liquid, the anti-backflow portion 1112 that is attached to the liquid cooling upper plate 12 is also used to increase the heat absorption efficiency, balance the overall flow rate and then balance the temperature of the entire liquid cooling plate 1, so that the temperature of the battery module 2 reaches consistency, which greatly improves the service life of the battery module 2.

[0149] The simulation data results of the liquid cooling plate in the above embodiment and a liquid cooling plate in the prior art are compared and analyzed below:

[0150] In order to keep consistent with the actual working conditions during simulation, 52 280 battery cells arranged in 4 vertical rows are used to form a battery module (i.e., a heat source). The heat generation power of each battery cell is 15W. The coolant in the liquid cooling plate is a 1:1 mixture of water and ethylene glycol, and the material of the liquid cooling plate is aluminum alloy. During simulation, the liquid cooling plate and the battery module are modeled and simplified, and the unstructured grid is divided to obtain the calculation grid. The liquid flow rate entering the liquid cooling plate at the liquid inlet of the two liquid cooling plates is set to 5L / min, and the liquid outlet is set to a simple pressure boundary outlet. Finally, after 2000 iterations, the data converges and the relevant experimental results are obtained.

[0151] Figure 6 This is a schematic diagram of the structure of a liquid cooling plate in the prior art. Figure 6 The port near the lower left is the liquid inlet of the liquid cooling plate, and the port near the lower right is the liquid outlet of the liquid cooling plate. Figure 7 is based on Figure 6 The corresponding simulated battery module model diagram obtained by modeling the liquid cooling plate in .

[0152] Figure 8 yes Figure 6 The pressure distribution diagram of the liquid cooling plate in Figure 8 As shown, the flow resistance at the highest point in the liquid cooling plate is about 369.6 Pa. The flow resistance is relatively high, and the flow of the fluid in the liquid cooling plate is not very smooth.

[0153] Fig. 9 yes Figure 6 The flow trajectory diagram of the liquid cooling plate in Fig. 9 It can be seen that the flow distribution of the coolant in the entire liquid cooling plate is relatively gentle, and the flow velocity distribution is fairly uniform. However, turbulence occurs at many flow paths of the liquid cooling plate after the flow velocity increases. Turbulence is superimposed on each other at many locations in the upper right part. Due to the relatively small Reynolds number of the fluid, some vortex limited recirculation areas appear in these places, which has an adverse effect on heat dissipation.

[0154] Fig.10 yes Figure 7 Battery module utilization Figure 6 The temperature distribution diagram of the liquid cooling plate in the heat dissipation is shown in Figure 1. Fig.10 It can be seen from the simulation results that Fig.10 After the battery module was cooled by the liquid cooling plate, the highest temperature in the battery module reached 48.67°C. The high-temperature area was mainly distributed in the middle section of the vertical column of battery cells, and the temperature difference with the lower temperature at the edge of the battery module was about 9 to 10°C.

[0155] Figure 4 It is a structural schematic diagram of a liquid cooling channel plate in a liquid cooling plate in an embodiment of the utility model. Fig.11 is based on Figure 4 The corresponding simulated battery module model diagram obtained by modeling the liquid cooling plate in .

[0156] Fig.12 yes Figure 4 The pressure distribution diagram of the liquid cooling plate in FIG. Fig.12 As shown, the flow resistance at the highest point of the liquid cooling plate reaches 77.37Pa, which is much lower than Figure 6 The flow resistance at the highest point in the liquid cooling plate in the prior art is reduced, and the fluid flows smoothly in the liquid cooling plate.

[0157] Fig.13 yes Figure 4 The flow trajectory diagram of the liquid cooling plate in Fig.13 It can be seen that the flow distribution of the coolant in the entire liquid cooling plate is very gentle, and the flow velocity distribution is relatively uniform. Only in a few areas such as the position of the second water resistance component, turbulence is generated. The structural design of the liquid cooling plate in the utility model prevents the liquid cooling plate from dissipating heat too quickly and causing condensation. Since the fluid has viscosity and there is friction between the fluid and the wall, the fluid medium will be unevenly distributed at the turbulence. At this time, if the turbulence of the fluid is high, it will have a greater impact on the heat dissipation function. However, the turbulence of the liquid cooling plate turbulence of the utility model is relatively small, and the impact on the heat dissipation function is also relatively small.

[0158] By comparison, it can be seen that the liquid cooling plate in the utility model is Figure 6 Compared with the liquid cooling plate in the prior art, the flow of the cooling liquid in the liquid cooling plate of the utility model is more stable, orderly, and steady, and there are fewer places where turbulence occurs.

[0159] Fig.14 yes Fig.11 Battery module utilization Figure 4 Temperature distribution diagram when the liquid cooling plate in the cooling system is used for heat dissipation. Fig.14 It can be seen from the simulation results that Fig.14 After the battery module is cooled by the liquid cooling plate, the highest temperature in the battery module is 45.64°C. The high temperature area is mainly distributed in the middle part of the vertical column of battery cells, and the temperature difference between it and the lower temperature at the edge of the battery module is only about 6 to 8°C.

[0160] According to the comparison of simulation results, the cooling effect of the liquid cooling plate of the utility model is better than that of Figure 6 The cooling effect of the liquid cooling plate in the prior art is improved, and the temperature difference of each part of the battery module after cooling is smaller.

[0161] because Figures 7 to 14 All images are generated by simulation software, so there are grid backgrounds, gradient color renderings, reflections and other images in some pictures, but these images will not have any effect on the experimental results, they are just the rendering background of the software.

[0162] The liquid cooling plate of the utility model optimizes the distribution structure of the liquid flow channel in the liquid cooling channel plate, sets a plurality of parallel water inlet flow channels and water outlet flow channels, sets a rotating flow channel connecting each water inlet flow channel and each water outlet flow channel, and sets a plurality of first water resistance members in the rotating flow channel, so as to realize the purpose of uniform heat absorption by utilizing the diversion structure, and utilizes the setting of the first water resistance member to achieve the purpose of slowing down the front flow velocity, increasing the rear flow velocity, and increasing the solid heat absorption area. At the same time, the setting of the plurality of first water resistance members can also realize the function of reflux and diversion. The liquid cooling plate of this structure ensures that the water flow in each main flow channel is relatively uniform, which is not only conducive to improving the heat equalization function of the liquid cooling plate, but also can improve the heat dissipation effect of the liquid cooling plate. The battery system with the liquid cooling plate equipped with the above-mentioned liquid cooling plate makes the temperature of the battery module reach consistency, which greatly improves the service life of the battery module.

[0163] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technology in the field can make many modifications and changes according to the concept of the utility model without creative work. Therefore, any technical solution that can be obtained by a technician in the technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A liquid cooling plate, characterized in that: include: A liquid-cooling flow channel plate, wherein the liquid-cooling flow channel plate is provided with a liquid inlet, a liquid outlet and a liquid flow channel formed by a recessed structure on the liquid-cooling flow channel plate; the liquid flow channel comprises at least two groups of water inlet flow channels, a rotating flow channel and at least two groups of water outlet flow channels, the liquid inlet and the liquid outlet are located on the same side of the liquid-cooling flow channel plate, each of the water inlet flow channels is arranged in parallel with each of the water outlet flow channels, the first end of each of the water inlet flow channels is connected to the liquid inlet, the first end of each of the water outlet flow channels is connected to the liquid outlet, the rotating flow channel is connected to the second end of each of the water inlet flow channels and the second end of each of the water outlet flow channels, and a plurality of first water resistance members are arranged in the rotating flow channel; A liquid-cooled upper plate is covered on the liquid-cooled flow channel plate to close the liquid flow channel.

2. The liquid cooling plate according to claim 1, characterized in that: Parts of the liquid-cooling channel plate on one side facing the liquid-cooling upper plate except for the liquid inlet, the liquid outlet and the liquid channel are all in contact with the liquid-cooling upper plate.

3. The liquid cooling plate according to claim 1, characterized in that: Each group of water inlet channels is separated by a first main dividing rib, and each group of water outlet channels is separated by a second main dividing rib.

4. The liquid cooling plate according to claim 3, characterized in that: The liquid flow channel includes two groups of water inlet flow channels; The first end of the first main dividing rib extends to the position of the liquid inlet to form a water inlet fork at the position where the liquid inlet connects the two groups of the water inlet flow channels; The first main dividing rib is also provided with a guide portion, and the guide portion is formed by a branch extending from the first end of the first main dividing rib toward any group of the water inlet flow channels.

5. The liquid cooling plate according to claim 3, characterized in that: The liquid flow channel includes two groups of water outlet flow channels; The first end of the second main dividing rib extends to the position of the liquid outlet to form a water outlet fork at the position where the liquid outlet connects the two groups of the water outlet channels; The second main dividing rib is also provided with a backflow prevention portion, and the backflow prevention portion is formed by a branch extending from the first end of the second main dividing rib toward any group of the water outlet flow channels.

6. The liquid cooling plate according to claim 5, characterized in that: The backflow prevention portion is formed by a branch extending from the first end of the second main dividing rib toward the water outlet channel near the edge of the liquid cooling channel plate, and the backflow prevention portion is perpendicular to the main trunk of the second main dividing rib.

7. The liquid cooling plate according to claim 1, characterized in that: Each of the water inlet channels comprises a plurality of branch water inlet channels arranged in parallel and separated by at least one first dividing rib; Each of the water outlet channels comprises a plurality of branch water outlet channels arranged in parallel and separated by at least one second dividing rib.

8. The liquid cooling plate according to claim 7, characterized in that: At least one second water resistance member is provided at a position of the liquid-cooling main channel in each of the water inlet channels that is close to the liquid inlet and is not divided into a plurality of branch water inlet channels.

9. The liquid cooling plate according to claim 8, characterized in that: The liquid flow channel includes two groups of water inlet flow channels; Among them, one second water resistance member is provided in the water inlet channel near the edge side of the liquid-cooling channel plate, and two second water resistance members are provided in the water inlet channel near the middle side of the liquid-cooling channel plate.

10. The liquid cooling plate according to claim 9, characterized in that: The length of one of the second water resistance members arranged in the water inlet channel close to the edge of the liquid-cooling channel plate accounts for 13% to 17% of the length of the water inlet channel; The total length of the two second water resistance members arranged in the water inlet channel close to the middle side of the liquid-cooling channel plate accounts for 23% to 27% of the length of the water inlet channel.

11. The liquid cooling plate according to claim 1, characterized in that: The plurality of first water resistance members in the rotating flow channel are distributed in the rotating flow channel at positions adjacent to the second end of the water inlet flow channel; or The several first water resistance members in the rotating flow channel include: a plurality of water inlet first water resistance members adjacent to the second end of the water inlet flow channel and a plurality of water outlet first water resistance members adjacent to the second end of the water outlet flow channel, and the water blocking force of the water inlet first water resistance members is greater than the water blocking force of the water outlet first water resistance members.

12. The liquid cooling plate according to claim 11, characterized in that: When the plurality of first water resistance members include a plurality of the water inlet first water resistance members and a plurality of the water outlet first water resistance members, the length of the water inlet first water resistance member is longer than the length of the water outlet first water resistance member.

13. A battery system with a liquid cooling plate, characterized in that: It comprises the liquid cooling plate and battery module according to any one of claims 1 to 12, wherein the battery module is bonded to the liquid cooling upper plate in the liquid cooling plate.

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