Efficient cooling assembly for immersed cooling energy storage battery pack

Abstract

According to the efficient cooling assembly for the immersed cooling energy storage battery pack, a plurality of battery cells are arranged in the energy storage battery pack in an array mode, a snakelike flat pipe is arranged on the outer side of each row of battery cells, immersion liquid is arranged between the battery cells and the snakelike flat pipes, the snakelike flat pipes are provided with inlet end flow channels and outlet end flow channels in a mutual conduction mode, the inlet end flow channels are communicated with the outlet end flow channels, and the outlet end flow channels are communicated with the inlet end flow channels. An inlet connecting pipe and an outlet connecting pipe are arranged on the outer side of one end of the inlet end flow channel and the outer side of one end of the outlet end flow channel in an extending and protruding mode respectively, and the surface of one side of the inlet end flow channel and the surface of one side of the outlet end flow channel are symmetrically attached and connected. And the immersion liquid is transferred to the snake-shaped flat pipe and the cooling liquid, and the immersion liquid serving as a heat transfer medium totally submerges the battery cell in the heat transfer process, so that the heat dissipation area of the battery cell is the whole battery cell, and the heat exchange efficiency is greatly improved.

Description

Technical Field

[0001] This article belongs to the technical field of energy storage battery packs, and specifically relates to an efficient cooling component for an immersion-cooled energy storage battery pack. Background Art

[0002] In recent years, as the capacity of energy storage battery cells has become larger and larger, the heat generated during the integration of a large number of battery cells has also become greater. The initial air-cooling technology can no longer meet the current product requirements.

[0003] Liquid cooling technology has gradually and comprehensively replaced air-cooling technology. The liquid cooling system has high heat dissipation efficiency, small temperature difference between battery clusters, and greatly improves the life and full-life cycle economy of the battery. The most common liquid cooling technology currently is cold plate liquid cooling, which belongs to indirect liquid cooling, that is, the heating element and the cooling medium do not directly contact. The cold plate liquid cooling dissipates heat by directly contacting a cold plate filled with liquid, or the heat is conducted to the cold plate by a heat-conducting component, and then the heat is taken away by the liquid circulation inside the cold plate.

[0004] Since the heating element does not contact the cooling medium and there is a layer of thermal conductive adhesive between them, the thermal resistance increases; the area in contact with the battery cell is also small, so the heat dissipation area is small; there is also heat transfer between the cold plate and the air during operation, resulting in more energy loss; various factors affect the heat exchange efficiency. As the energy density of the battery cell becomes higher and higher, the cold plate liquid cooling will not be able to ensure the optimal working temperature of the battery cell.

[0005] The cold plate liquid cooling also has problems in terms of weight and cost. The liquid cooling plate can only contact one surface of the battery cell. If the heat dissipation area needs to be increased, the number of liquid cooling plates needs to be increased, and the cost will also increase.

[0006] The cold plate liquid cooling needs to be equipped with a fire protection system inside the battery pack. When thermal runaway occurs, the fire protection system intervenes to ensure safety, further increasing the cost.

[0007] The surface of the battery cell cooled by the cold plate liquid cooling is often one surface. During operation, the battery cell generates heat all around. With single-contact surface heat dissipation, there will be a large temperature difference in the battery cell itself. After long-term operation, it is easy to cause the expansion of the battery cell, affecting the life of the battery cell and also bringing system safety. Utility Model Content

[0008] In order to solve the above problems, this paper proposes a high-efficiency cooling component for an immersion cooling energy storage battery pack. The internal array of the energy storage battery pack is provided with a plurality of battery cells. The outer side of each row of battery cells is provided with a serpentine flat tube. Immersion liquid is provided between the battery cells and the serpentine flat tube. The serpentine flat tube is provided with an inlet flow channel and an outlet flow channel in a mutually conductive manner. The outer sides of one end of the inlet flow channel and the outlet flow channel are respectively extended and protruded to be provided with an inlet pipe connection and an outlet pipe connection. The surfaces of one side of the inlet flow channel and the outlet flow channel are symmetrically fitted and connected to each other. The inlet flow channel and the outlet flow channel are provided with one end of the inlet pipe connection and the outlet pipe connection flush with each other, and the other ends of the inlet flow channel and the outlet flow channel are symmetrically connected to each other. The end flow channels are respectively equidistant and parallel to each other, and are provided with an inlet-end primary side plate flow channel, an inlet-end secondary side plate flow channel and an inlet-end tertiary side plate flow channel. The outlet flow channels are respectively equidistant and parallel to each other, and are provided with an outlet-end primary side plate flow channel, an outlet-end secondary side plate flow channel and an outlet-end tertiary side plate flow channel. By using an immersion-type energy storage battery pack, the heat dissipation area is increased. Compared with traditional cold plate heat dissipation that can only dissipate heat from the bottom of the battery cell, the heat exchange efficiency is improved. Serpentine flat tubes are arranged on the outside of the battery cell and the immersion liquid to transfer the heat dissipated by the battery to the immersion liquid, and the immersion liquid is transferred to the serpentine flat tube and the coolant. In the process of heat transfer, the immersion liquid as a heat transfer medium completely submerges the battery cell. Therefore, the heat dissipation area of ​​the battery cell is the entire battery cell, and the heat exchange efficiency is greatly improved.

[0009] The battery cells are in the shape of rectangular blocks. The battery cells are laterally bonded to each other to form a battery cell group. Battery cell groups are provided adjacent to each other on both sides of the battery cell group. The battery cell group is embedded between the inlet flow channel or the outlet flow channel. The outer surface of the battery cell group is bonded to the inner surface of the inlet flow channel or the outlet flow channel. Immersion liquid is provided between the battery cell group and the inlet flow channel or the outlet flow channel. The battery cells are grouped and arranged between the inlet flow channel or the outlet flow channel, thereby realizing grouped heat dissipation of the battery cells and reducing the hidden danger of excessive concentrated heat accumulation in the battery cells. The immersion liquid completely submerges the battery cells, so there is no need to worry about thermal runaway and other aspects, and the safety of the entire battery pack is strongly guaranteed.

[0010] The shape of the serpentine flat tube is a flat bent pipeline. The middle part of the serpentine flat tube is a four-way conducting connecting tube. The inside of the serpentine flat tube is provided with coolant. The serpentine flat tube replaces the traditional liquid cooling plate. The weight of the serpentine flat tube is about 0.5kg, while the weight of the traditional liquid cooling plate is generally more than 5kg, which is 10 times different.

[0011] The shapes of the inlet flow channel and the outlet flow channel are both symmetrical rectangular frames, and one end of the inlet flow channel and the outlet flow channel are connected to the inlet pipe and the outlet pipe in a three-in-one conductive manner. One end of the inlet first-level side plate flow channel, the inlet second-level side plate flow channel and the inlet third-level side plate flow channel are connected to the inlet pipe in a three-in-one manner, and one end of the outlet first-level side plate flow channel, the outlet second-level side plate flow channel and the outlet third-level side plate flow channel are connected to the outlet pipe in a three-in-one manner. The other end of the inlet first-level side plate flow channel is conductively connected to the other end of the outlet first-level side plate flow channel, the other end of the inlet second-level side plate flow channel is conductively connected to the other end of the outlet second-level side plate flow channel, and the other end of the inlet third-level side plate flow channel is conductively connected to the outlet third-level side plate flow channel. The other end is connected to the inlet pipe and the outlet pipe. Both the inlet pipe and the outlet pipe are in the shape of an L-shaped flow channel pipe. One side of the inlet pipe and the outlet pipe is vertically fitted with the end of the inlet flow channel or the outlet flow channel. The upper surface of the horizontal middle part of the other side of the inlet pipe and the outlet pipe is provided with a water pipe interface. By grouping the serpentine flat tubes into the inlet flow channel and the outlet flow channel in parallel, it is convenient to set up each battery cell group independently, and the contact area between the battery cell and the serpentine flat tube is increased to improve the thermal conductivity. The design of interconnection between the inlet flow channel and the outlet flow channel can not only realize the circulation convection of the coolant, but also realize that the inlet flow channel and the outlet flow channel form an inner-enclosed frame structure, which is convenient for filling the immersion liquid and the battery cell.

[0012] Beneficial effects:

[0013] By using an immersion energy storage battery pack, the heat dissipation area is increased. Compared with traditional cold plate heat dissipation that can only dissipate heat from the bottom of the battery cell, the heat exchange efficiency is improved. Serpentine flat tubes are set on the outside of the battery cell and the immersion liquid to transfer the heat dissipated by the battery to the immersion liquid, and the immersion liquid is transferred to the serpentine flat tube and the coolant. During the heat transfer process, the immersion liquid as the heat transfer medium completely submerges the battery cell. Therefore, the heat dissipation area of ​​the battery cell is the entire battery cell, and the heat exchange efficiency is greatly improved.

[0014] The battery cells are grouped and arranged between the inlet flow channel or the outlet flow channel, so as to achieve group heat dissipation of the battery cells and reduce the hidden danger of excessively concentrated heat accumulation in the battery cells. The immersion liquid completely submerges the battery cells, so there is no need to worry about thermal runaway and other aspects. The safety of the entire battery pack is strongly guaranteed.

[0015] The serpentine flat tube replaces the traditional liquid cooling plate. The serpentine flat tube weighs about 0.5kg, while the traditional liquid cooling plate generally weighs more than 5kg, a difference of 10 times.

[0016] By grouping the serpentine flat tubes in parallel to form an inlet flow channel and an outlet flow channel, it is convenient to set each group of battery cells independently, and it also increases the contact area between the battery cells and the serpentine flat tubes, improving the heat conduction efficiency. The design of the interconnected inlet flow channel and outlet flow channel can not only achieve the circulating convection of the coolant, but also enable the inlet flow channel and the outlet flow channel to form an inner wrapping frame structure, facilitating the filling of the immersion liquid and the battery cells. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the frame of an efficient cooling component for an immersion-cooled energy storage battery pack;

[0018] Figure 2 It is a top view of the assembly of an efficient cooling component for an immersion-cooled energy storage battery pack;

[0019] In the figure: 1, inlet connecting pipe; 2, serpentine flat tube; 3, inlet first-stage side plate flow channel; 4, inlet second-stage side plate flow channel; 5, inlet third-stage side plate flow channel; 6, outlet first-stage side plate flow channel; 7, outlet second-stage side plate flow channel; 8, outlet third-stage side plate flow channel; 9, outlet connecting pipe; 10, battery cell. Detailed Description of the Invention

[0020] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0021] Inlet connecting pipe 1, serpentine flat tube 2, inlet first-stage side plate flow channel 3, inlet second-stage side plate flow channel 4, inlet third-stage side plate flow channel 5, outlet first-stage side plate flow channel 6, outlet second-stage side plate flow channel 7, outlet third-stage side plate flow channel 8, outlet connecting pipe 9, battery cell 10.

[0022] As Figure 1 , 2 shown;

[0023] A high-efficiency cooling component for an immersion cooling energy storage battery pack, wherein a plurality of battery cells 10 are arranged in an array inside the energy storage battery pack, a serpentine flat tube 2 is arranged on the outside of each row of battery cells 10, an immersion liquid is arranged between the battery cells 10 and the serpentine flat tube 2, the serpentine flat tube 2 is provided with an inlet flow channel and an outlet flow channel in a mutually conductive manner, an inlet pipe 1 and an outlet pipe 9 are respectively extended and protruded on the outside of one end of the inlet flow channel and the outlet flow channel, one side surface of the inlet flow channel and the outlet flow channel is symmetrically connected to each other, the inlet flow channel and the outlet flow channel are provided with one end of the inlet pipe 1 and the outlet pipe 9 flush with each other, and the inlet flow channel and the outlet flow channel are provided with a plurality of serpentine flat tubes 2. The other end is symmetrically connected to each other, the inlet flow channel is respectively equidistant and parallel to each other, and is provided with an inlet first-level side plate flow channel 3, an inlet second-level side plate flow channel 4 and an inlet third-level side plate flow channel 5, and the outlet flow channel is respectively equidistant and parallel to each other, and is provided with an outlet first-level side plate flow channel 6, an outlet second-level side plate flow channel 7 and an outlet third-level side plate flow channel 8, the shape of the battery cell 10 is a rectangular block, and the battery cells 10 are horizontally fitted to form a battery cell 10 group, and the battery cells 10 groups are adjacent on both sides of the battery cell 10 group, and the battery cell 10 group is embedded between the inlet flow channel or the outlet flow channel, and the outer surface of the battery cell 10 group is relative to the inner surface of the inlet flow channel or the outlet flow channel. The serpentine flat tube 2 is in the shape of a flat curved pipeline, the middle part of the serpentine flat tube 2 is a four-way conducting connecting tube, and the inside of the serpentine flat tube 2 is provided with a coolant. The shapes of the inlet and outlet flow channels are both symmetrical rectangular frames, and one end of the inlet and outlet flow channels are connected to the inlet pipe 1 and the outlet pipe 9 in a three-in-one conducting manner. One end of the inlet primary side plate flow channel 3, the inlet secondary side plate flow channel 4 and the inlet tertiary side plate flow channel 5 are connected to the inlet pipe 1 in a three-in-one manner, and the outlet primary side plate flow channel 6, the outlet secondary side plate flow channel 7 and the outlet tertiary side plate flow channel 8 are connected to the inlet pipe 1 in a three-in-one manner. One end of the inlet pipe 1 is connected to the outlet pipe 9 in a three-in-one manner, the other end of the inlet first-level side plate flow channel 3 is conductively connected to the other end of the outlet first-level side plate flow channel 6, the other end of the inlet second-level side plate flow channel 4 is conductively connected to the other end of the outlet second-level side plate flow channel 7, the other end of the inlet tertiary side plate flow channel 5 is conductively connected to the other end of the outlet tertiary side plate flow channel 8, the inlet pipe 1 and the outlet pipe 9 are both in the shape of L-shaped flow channel pipes, one side of the inlet pipe 1 and the outlet pipe 9 is vertically fitted with the end of the inlet flow channel or the outlet flow channel, and the upper surface of the horizontal middle part of the other side of the inlet pipe 1 and the outlet pipe 9 is provided with a water pipe interface.

[0024] Implementation examples;

[0025] When the battery is working, the battery begins to generate heat and dissipate it to the surroundings. The low-temperature coolant flows through the serpentine flat tube 2, and the flat tubes on each path absorb the heat dissipated by the battery. A specially designed separator is arranged between the battery cells 10. This separator can enable energy flow between the immersion liquid and the battery cells 10, improving the temperature uniformity of the battery cells 10 in the entire battery pack. After absorbing the heat from the battery cells 10, the coolant flows out through the liquid outlet 9 and circulates continuously to complete the heat exchange of the entire system.

[0026] The heat dissipated by the battery is transferred to the immersion liquid, and the immersion liquid is transferred to the serpentine flat tube 2 and the coolant. During the heat transfer process, as the heat transfer medium, the immersion liquid completely submerges the battery cells 10. Therefore, the heat dissipation area of the battery cells 10 is the entire battery cells 10, and the heat exchange efficiency is greatly improved. By using the serpentine flat tube 2 method, the weight and cost of the entire battery pack will also be reduced. Since the immersion liquid completely submerges the battery cells 10, there is no need to worry about issues such as thermal runaway, and the safety of the entire battery pack is strongly guaranteed.

[0027] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An efficient cooling component for an immersion-cooled energy storage battery pack, wherein a number of battery cells are arranged in an internal array of the energy storage battery pack, and it is characterized in that, A serpentine flat tube is provided on the outside of each row of battery cells, and an immersion liquid is provided between the battery cells and the serpentine flat tube, and the serpentine flat tube is provided with an inlet flow channel and an outlet flow channel in a mutually conductive manner, and an inlet connecting pipe and an outlet connecting pipe are respectively extended and protruded on the outside of one end of the inlet flow channel and the outlet flow channel, and one side surface of the inlet flow channel and the outlet flow channel is symmetrically connected to each other, and one end of the inlet flow channel and the outlet flow channel provided with the inlet connecting pipe and the outlet connecting pipe is flush with each other, and the other end of the inlet flow channel and the outlet flow channel is symmetrically connected to each other, and the inlet flow channel is provided with an inlet first-level side plate flow channel, an inlet second-level side plate flow channel and an inlet tertiary side plate flow channel respectively equidistant and parallel to each other, and the outlet flow channel is provided with an outlet first-level side plate flow channel, an outlet second-level side plate flow channel and an outlet tertiary side plate flow channel respectively equidistant and parallel to each other.

2. The high-efficiency cooling component for an immersion-cooled energy storage battery pack according to claim 1, characterized in that, The battery cells are in the shape of rectangular blocks, and the battery cells are laterally bonded to each other to form a battery cell group. Battery cell groups are provided adjacent to each other on both sides of the battery cell group, and the battery cell group is embedded between the inlet flow channel or the outlet flow channel. The outer surface of the battery cell group and the inner surface of the inlet flow channel or the outlet flow channel are bonded to each other, and an immersion liquid is provided between the battery cell group and the inlet flow channel or the outlet flow channel.

3. The high-efficiency cooling component for an immersion-cooled energy storage battery pack according to claim 1, wherein, The shape of the serpentine flat tube is a flat bent pipeline, the middle part of the serpentine flat tube is a four-way conducting connecting pipe, and the inside of the serpentine flat tube is provided with cooling liquid.

4. The highly efficient cooling component for an immersion-cooled energy storage battery pack according to claim 1, wherein, The inlet flow channel and the outlet flow channel are both in the shape of symmetrical rectangular frames, and one end of the inlet flow channel and the outlet flow channel are connected to the inlet pipe and the outlet pipe in a three-in-one conductive manner.

5. The high-efficiency cooling component for an immersion-cooled energy storage battery pack according to claim 1, wherein, One ends of the inlet-end primary side plate flow channel, the inlet-end secondary side plate flow channel and the inlet-end tertiary side plate flow channel are connected to the inlet pipe in a three-in-one manner, and one ends of the outlet-end primary side plate flow channel, the outlet-end secondary side plate flow channel and the outlet-end tertiary side plate flow channel are connected to the outlet pipe in a three-in-one manner, the other end of the inlet-end primary side plate flow channel is conductively connected to the other end of the outlet-end primary side plate flow channel, the other end of the inlet-end secondary side plate flow channel is conductively connected to the other end of the outlet-end secondary side plate flow channel, and the other end of the inlet-end tertiary side plate flow channel is conductively connected to the other end of the outlet-end tertiary side plate flow channel.

6. The high-efficiency cooling component for an immersion-cooled energy storage battery pack according to claim 1, wherein, The inlet pipe and the outlet pipe are both in the shape of an L-shaped flow channel pipe, one side of the inlet pipe and the outlet pipe is vertically fitted and connected to the end of the inlet flow channel or the outlet flow channel, and the upper surface of the horizontal middle of the other side of the inlet pipe and the outlet pipe is provided with a water pipe interface.

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