Liquid cooling pipe for immersed cooling energy storage battery pack

Abstract

According to the liquid cooling pipe for the immersed cooling energy storage battery pack, a liquid cooling flow channel plate is arranged on the outer side of each row of battery cells, immersion liquid is arranged between the battery cells and the liquid cooling flow channel plates, the liquid cooling flow channel plates comprise a main flow channel plate and an auxiliary flow channel plate, the main flow channel plate and the auxiliary flow channel plate are hollow rectangular thin plates, and the main flow channel plate and the auxiliary flow channel plate are hollow rectangular thin plates. A plurality of auxiliary flow channel plates are longitudinally arranged between the main flow channel plates on the front side and the rear side in parallel, a straight liquid cooling plate adopting a traditional liquid cooling plate is split into a plurality of branch circuits and two main circuits to form a surrounding form, battery cells in a whole battery pack can be surrounded, the mounting is also very convenient, and after the battery cells form a module, the battery cells can be conveniently assembled and disassembled. The fixing points are additionally arranged on the two sides of the module, the liquid cooling pipe is directly placed above the whole battery cell, and the temperature difference can be controlled to be about 1 DEG C through actual testing and belongs to the center level in the industry.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of immersion cooling energy storage batteries, and particularly relates to a liquid cooling pipe for an immersion cooling energy storage battery pack BACKGROUND

[0002] In recent years, as the capacity of energy storage cells becomes larger and larger, the heat generated by a large number of cells during integration also becomes larger and larger, and the original air cooling technology can no longer meet the current product requirements.

[0003] Liquid cooling technology gradually and comprehensively replaces air cooling technology, and the liquid cooling system has high heat dissipation efficiency and small temperature difference between battery clusters, which greatly improves the life of the battery and the economy of the whole life cycle. The most common liquid cooling technology is cold plate liquid cooling, which belongs to indirect liquid cooling, that is, the heat generating element and the cooling medium are not in direct contact. The cold plate liquid cooling dissipates heat by directly contacting the cold plate filled with liquid, or conducts heat to the cold plate through a heat conducting part, and then removes heat through the liquid circulation inside the cold plate.

[0004] Since the heat generating element is not in contact with the cooling medium and is separated from the cooling medium by a layer of thermal conductive glue, the thermal resistance is increased. The area of the contact cell is small, and the heat dissipation area is small. The cold plate also has air transfer during operation, and the energy loss is large. Various factors affect the heat exchange efficiency, and as the energy density of the cell becomes higher and higher, the cold plate liquid cooling will not be able to guarantee the optimal working temperature of the cell.

[0005] The cold plate liquid cooling also has problems in weight and cost. The liquid cooling plate can only contact one face of the cell, and if the heat dissipation area is to be increased, the number of liquid cooling plates must be increased, which will also increase the cost.

[0006] The cold plate liquid cooling needs to configure a fire extinguishing system in the battery pack, and the fire extinguishing system intervenes in the case of thermal runaway to ensure safety, which further increases the cost.

[0007] The face of the cold plate liquid cooling cell is usually one face, and the cell will generate heat around it during operation. Single contact surface heat dissipation will cause large temperature difference of the cell itself, and long-term operation will cause cell expansion, affecting the life of the cell and also causing system safety. CONTENT OF THE INVENTION

[0008] To address the aforementioned issues, this paper proposes a liquid-cooled pipe for an immersion-cooled energy storage battery pack. The battery pack contains an array of battery cells arranged in an array, and these cells are combined to form a battery assembly. Each row of cells has a liquid-cooled flow channel plate on its outer side, with immersion liquid between the cells and the flow channel plate. The liquid-cooled flow channel plate includes a main flow channel plate and secondary flow channel plates, both of which are hollow rectangular thin plates. The main flow channel plates are horizontally positioned on the outer sides of both the front and rear ends of the battery assembly. Several secondary flow channel plates are arranged longitudinally parallel between the main flow channel plates on the front and rear sides. The secondary flow channels are located on the left and right sides of each row of cells. Both ends of the secondary flow channels are connected to the interior of the main flow channels on the front and rear sides. The front surface of the main flow channel is symmetrically equipped with inlet and outlet ports on the left and right sides. The traditional liquid cooling plate is a straight liquid cooling plate, which is divided into several branches and two main channels to form an enclosed shape that can surround the cells in the entire battery pack. The installation is also very convenient. After the cells are assembled into modules, fixing points are added on both sides of the module, and the liquid cooling pipe can be placed directly on top of the entire cell. After actual testing, the temperature difference can be controlled at about 1°C, which is at the top level in the industry.

[0009] The battery cells are rectangular blocks, and they are arranged horizontally to form a battery cell assembly. Battery cell assemblies are arranged adjacent to each other on both sides. The battery cell assemblies are embedded between the inlet or outlet flow channels. The outer surface of the battery cell assembly is in contact with the inner surface of the inlet or outlet flow channel. An immersion liquid is placed between the battery cell assembly and the inlet or outlet flow channel. With the use of battery cell separators, the principle of density difference is utilized. The cold liquid around the liquid cooling pipe sinks, while the hot liquid caused by the battery cell rises, forming a circulation flow. This flow plays a key role in temperature difference control.

[0010] The main flow channel plate and the secondary flow channel plate are flat, straight-through pipes. Both the main flow channel plate and the secondary flow channel plate are equipped with coolant. They provide sufficient heat dissipation while meeting the requirements of low cost, thus satisfying the actual use needs of the battery pack.

[0011] The internal center of the internal cavity of the front main flow channel plate is provided with a partition plate, the front main flow channel plate is divided into a water inlet cavity and a water outlet cavity by the partition plate, the water inlet cavity and the water inlet port are in communication with each other, the water outlet cavity and the water outlet port are in communication with each other, the interiors of the front main flow channel plate and the rear main flow channel plate are in communication with each other through the mutually communicating auxiliary flow channel plates, the number of the auxiliary flow channel plates in the water inlet cavity and the rear main flow channel plate is greater than the number of the auxiliary flow channel plates in the water outlet cavity and the rear main flow channel plate, the internal structure adopts a parallel mode, the auxiliary channel is divided into more inlets and less outlets, the internal flow resistance is increased, the heat exchange amount is improved, the heat dissipation amount of the battery pack under the charging and discharging working condition can be effectively supported, and the overall temperature of the battery cell of the battery pack can be controlled in a suitable range.

[0012] The water inlet port and the water outlet port are both straight-through circular pipe interfaces, and the water inlet port and the water outlet port are in communication with the front main flow channel plate in a vertical communication mode.

[0013] Advantages:

[0014] The traditional liquid cooling plate type straight liquid cooling plate is split into several branches and two main roads, forms a surrounding mode, can surround the battery cell in the entire battery pack, and is extremely convenient to install. After the battery cell is formed into a module, fixed points are increased on both sides of the module, and the liquid cooling pipe is directly placed above the entire battery cell. After actual testing, the temperature difference can be controlled within about 1 DEG C, which belongs to the top level in the industry.

[0015] The internal structure adopts a parallel mode, the auxiliary channel is divided into more inlets and less outlets, the internal flow resistance is increased, the heat exchange amount is improved, the heat dissipation amount of the battery pack under the charging and discharging working condition can be effectively supported, and the overall temperature of the battery cell of the battery pack can be controlled in a suitable range.

[0016] Under the condition of being able to meet the low cost, the heat dissipation is sufficient, and the actual use requirement of the battery pack is met.

[0017] In combination with the use of the battery cell partition plate, the principle of density difference is beneficial, the liquid with low temperature around the liquid cooling pipe falls down, the liquid with high temperature caused by the battery cell rises up, and a circulating flow is formed, which is a key factor of temperature difference control. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a battery cell assembly schematic diagram of a liquid cooling pipe for an immersed cooling energy storage battery pack.

[0019] Figure 2 It is a schematic diagram of a liquid cooling pipe for an immersed cooling energy storage battery pack.

[0020] In the drawing, 1 is a main flow channel plate, 2 is an auxiliary flow channel plate, 3 is a water inlet port, 4 is a water outlet port, and 5 is a battery cell. DETAILED DESCRIPTION

[0021] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0022] Main flow channel 1, secondary flow channel 2, inlet 3, outlet 4, battery cell 5.

[0023] like Figure 1 , 2 As shown;

[0024] A liquid cooling pipe for an immersion-cooled energy storage battery pack. The energy storage battery pack contains an array of battery cells 5 arranged in an array. These battery cells 5 are combined in an array configuration to form a battery pack. Each row of battery cells 5 has a liquid cooling channel plate on its outer side. Immersion liquid is placed between the battery cells 5 and the liquid cooling channel plate. The liquid cooling channel plate includes a main channel plate 1 and a secondary channel plate 2. Both the main channel plate 1 and the secondary channel plate 2 are hollow rectangular thin plates. The main channel plates 1 are horizontally positioned at both the front and rear ends of the battery pack, with the main channel plate horizontally positioned on their outer sides. The system includes a main channel plate 1, with several secondary channel plates 2 arranged longitudinally parallel to each other on the front and rear sides. Each secondary channel plate 2 is located on the left and right sides of each row of battery cells 5. Both ends of the secondary channel plates 2 are interconnected with the interiors of the main channel plates 1 and the secondary channel plates 2. The front surface of the main channel plate 1 has symmetrically arranged inlet 3 and outlet 4 on its left and right sides. Each battery cell 5 is a rectangular block, and the battery cells 5 are arranged horizontally to form a battery cell group. Battery cells are arranged adjacent to each other on both sides of the battery cell group. Five groups of battery cells are embedded between the inlet and outlet flow channels. The outer surface of each group of cells is in contact with the inner surface of the inlet or outlet flow channel. Immersion fluid is provided between the group of cells and the inlet or outlet flow channel. The main flow channel plate 1 and the secondary flow channel plate 2 are flat, straight-through pipes. Coolant is provided inside both the main flow channel plate 1 and the secondary flow channel plate 2. The inner cavity of the front main flow channel plate 1 is divided by a partition plate, which separates the front main flow channel plate 1 into an inlet chamber and an outlet chamber. The inlet chamber and the inlet 3 are interconnected, and the outlet chamber and the outlet 4 are interconnected. The interiors of the main flow channel 1 on the front side and the main flow channel 1 on the rear side are interconnected through the auxiliary flow channel 2. The number of auxiliary flow channel 2 interconnected with the main flow channel 1 on the rear side in the inlet chamber is greater than the number of auxiliary flow channel 2 interconnected with the main flow channel 1 on the rear side in the outlet chamber. The inlet 3 and the outlet 4 are both straight-through round pipe interfaces, and the inlet 3 and the outlet 4 are vertically interconnected with the main flow channel 1 on the front side.

[0025] Implementation example;

[0026] When the battery works, the battery begins to generate heat and dissipate to the surroundings, the cooling liquid of low temperature flows through the main flow channel plate 1 and the auxiliary flow channel plate 2, the flat tube on each path absorbs the heat dissipated by the battery, the special designed baffle is arranged between the battery core 5 and the battery core 5, the baffle can make the immersion liquid and the battery core 5 generate energy flow, the temperature uniformity of the battery core 5 of the whole battery pack is improved, the cooling liquid absorbs the heat from the battery core 5 and flows out through the water outlet 4, and continuously circulates to complete the heat exchange of the whole system.

[0027] The heat dissipated by the battery is transmitted to the immersion liquid, the immersion liquid is transmitted to the main flow channel plate 1 and the auxiliary flow channel plate 2 and the cooling liquid, in the process of heat transmission, the immersion liquid as the heat transfer medium fully immerses the battery core 5, therefore the heat dissipation area of the battery core 5 is the whole battery core 5, the heat exchange efficiency is greatly improved, the main flow channel plate 1 and the auxiliary flow channel plate 2 are adopted, the weight and the cost of the whole battery pack are also reduced, the immersion liquid fully immerses the battery core 5, therefore it is unnecessary to worry about the heat runaway and the like, and the safety of the whole battery pack is strongly guaranteed.

[0028] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A liquid cooling pipe for an immersion cooling energy storage battery pack, the energy storage battery pack having an internal array of a plurality of battery cells, the plurality of battery cells being arrayed in combination to form a battery pack, wherein the liquid cooling pipe is configured to be in fluid communication with the plurality of battery cells. The outer side of each row of battery cells is provided with a liquid cooling channel plate, and the battery cells and the liquid cooling channel plate are provided with immersion liquid, the liquid cooling channel plate comprises a main channel plate and a secondary channel plate, the main channel plate and the secondary channel plate are hollow rectangular thin plates, the main channel plate is horizontally arranged on the outer side of the front and rear ends of the battery pack, the main channel plate is horizontally arranged on the outer side of the front and rear ends of the battery pack, the front and rear main channel plates are longitudinally arranged on the left and right sides of each row of battery cells, the two ends of the secondary channel plate are connected with the inner sides of the front and rear main channel plates and the inner side of the secondary channel plate, and the front side surface of the front main channel plate is symmetrically provided with a water inlet and a water outlet.

2. The liquid cooling tube for the submerged cooling energy storage battery pack according to claim 1, characterized in that, The shape of the battery cell is a rectangular block, the battery cells are horizontally arranged to form a battery cell group, the battery cell group is arranged adjacent to the two sides of the battery cell group, the battery cell group is inlaid between the inlet flow channel or the outlet flow channel, the outer surface of the battery cell group is inlaid with the inner surface of the inlet flow channel or the outlet flow channel, and the battery cell group and the inlet flow channel or the outlet flow channel are provided with immersion liquid.

3. The liquid cooling tube for the submerged cooling energy storage battery pack according to claim 1, characterized in that, The shape of the main channel plate and the secondary channel plate is a flat straight-through pipe, and the inner side of the main channel plate and the secondary channel plate is provided with cooling liquid.

4. The liquid cooling tube for the submerged cooling energy storage battery pack according to claim 1, characterized in that, The inner side of the inner cavity of the front main channel plate is provided with a partition plate, the front main channel plate is divided into a water inlet cavity and a water outlet cavity by the partition plate, the water inlet cavity is connected with the water inlet, and the water outlet cavity is connected with the water outlet.

5. The liquid cooling tube for an immersion-cooled energy storage battery pack according to claim 4, characterized in that, The inner sides of the front main channel plate and the rear main channel plate are connected by the secondary channel plate, the number of the secondary channel plates connected between the water inlet cavity and the rear main channel plate is greater than the number of the secondary channel plates connected between the water outlet cavity and the rear main channel plate.

6. The liquid cooling tube for an immersion-cooled energy storage battery pack of claim 1, wherein, The water inlet and the water outlet are straight-through circular pipe interfaces, and the water inlet and the water outlet are vertically connected with the front main channel plate.

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