Battery module and immersed cooling battery pack

Abstract

The utility model relates to a battery module and an immersed cooling battery pack, the battery module is installed in the immersed cooling battery pack, the battery module comprises a plurality of battery cells, two end plates, a plurality of heat dissipation plates and a plurality of pressing strips, the battery cells are fixed between the two end plates, every two adjacent battery cells are separated by the heat dissipation plates and the pressing strips, and the battery cells are fixed on the two end plates. And a gap is formed between one heat dissipation plate and the end surface of the battery cell. According to the battery module and the immersed cooling battery pack, the temperature rise does not exceed 5 DEG C when the battery runs, and the temperature difference between different battery cells does not exceed 2 DEG C, so that the overall safety of the battery pack is greatly improved through the multiple safeguard measures, and a more reliable guarantee is provided for the use of a user.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a battery module and an immersion-cooled battery pack having the battery module. Background Art

[0002] As the capacity of lithium-ion batteries gradually increases, the number of battery cells in a pack increases, and the need to meet charging requirements at different rates arises, higher requirements are placed on the design and optimization of lithium-ion battery thermal management systems. Traditional air cooling and indirect liquid cooling technologies are difficult to meet the optimal operating temperature range of energy storage cells.

[0003] The existing liquid cooling technology places the battery cells directly on the liquid cooling plate for cooling. The maximum temperature difference between the bottom and top of a single battery cell and the entire pack of batteries is very large. Utility Model Content

[0004] In response to the deficiencies in the prior art, the present invention provides a battery module and an immersion-cooled battery pack having the battery module. The battery cells are immersed in coolant through an immersion cooling method, which greatly reduces the temperature difference between the battery cells themselves and the entire pack of battery cells, greatly improving the safety and service life of the battery.

[0005] The utility model is achieved through the following technical solutions:

[0006] The utility model provides a battery module, which includes a plurality of battery cells, two end plates, a plurality of heat dissipation plates and a plurality of pressure strips. The battery cells are fixed between the two end plates, and adjacent battery cells are separated by the heat dissipation plates and the pressure strips, and there is a gap between one of the heat dissipation plates and the end face of the battery cell.

[0007] In order to facilitate assembly and improve the heat dissipation effect, a group of pressure strips are arranged between two adjacent heat dissipation plates. A cavity that can accommodate the battery cell is formed between the two heat dissipation plates and the two pressure strips. The pressure strips are symmetrically arranged on both sides of the battery cell and abut against the side of the battery cell. The thickness of the pressure strips is greater than the thickness of the battery cell. One of the heat dissipation plates abuts against one end face of the battery cell, and the other heat dissipation plate abuts against the two pressure strips and forms a gap between the other end face of the battery cell.

[0008] In order to facilitate relative fixation, the end plates, battery cells, heat sinks and pressure strips are fixed together by a binding ring.

[0009] The present invention also provides an immersion-cooled battery pack, comprising an outer shell, a cover plate, and a coolant filled in the outer shell. The above-mentioned battery module is arranged in the outer shell. The height of the coolant is higher than the height of the battery cell and lower than the height of the pole piece at the top of the battery cell. The coolant has an insulating effect.

[0010] In order to further improve the heat dissipation effect of the battery module, the immersion cooling battery pack also includes a heat dissipation component, which includes a plurality of heat dissipation pipes and water inlet pipes and water outlet pipes connected to the heat dissipation pipes. The heat dissipation pipes are evenly distributed around each battery module, and coolant 2 is provided in the heat dissipation pipes.

[0011] In order to ensure that the flow rates of each pipeline are consistent and the heat dissipation is more uniform, a flow regulating device is provided at the outlet of each branch of the heat dissipation pipe.

[0012] In order to ensure the strength of the entire shell and improve the heat dissipation effect at the bottom of the battery module, the bottom plate inside the shell is provided with a plurality of upwardly arched wave-shaped reinforcing ribs, with a gap between adjacent reinforcing ribs, and the battery module is detachably fixed to the reinforcing ribs.

[0013] In order to further improve the uniformity of heat dissipation of the battery module, a confluence assembly is respectively provided at the inlet and outlet of the heat dissipation pipe. The heat dissipation pipe at the inlet passes through the gap between the reinforcing ribs at the bottom end of the battery module, extends upward and then passes through the top of the battery module and is connected with the confluence assembly at the outlet.

[0014] In order to achieve heat transfer and reduce the impact generated by liquid flow, a number of baffles perpendicular to the horizontal plane are provided in the shell. The baffles are evenly distributed between the battery modules and are installed on the heat pipes.

[0015] The beneficial effects of the present invention are as follows: the battery module and the immersion cooling battery pack can achieve a temperature rise of no more than 5°C during battery operation, and a temperature difference of no more than 2°C between different battery cells, thereby extending the battery life; the coolant, while acting as a temperature control medium, can also play a fire-fighting role to a certain extent, reducing the risk of thermal runaway of the battery; even in extreme cases, when thermal runaway occurs in the battery cell, due to the low boiling point of the insulating solution, the solution will quickly vaporize at the moment of thermal runaway, and a large amount of heat can be taken away extremely quickly during the vaporization process; at the same time, the heat sink also plays a key role, which effectively isolates the transmission of thermal runaway between battery cells, greatly reducing the adverse effects of thermal runaway; through these multiple safeguards, the overall safety of the battery pack is greatly improved, providing more reliable protection for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the battery module of the present invention;

[0017] Figure 2 This is a schematic diagram of the partial structure of the battery module of the present utility model;

[0018] Figure 3This is a schematic diagram of the three-dimensional structure of the immersion cooling battery pack of the present invention;

[0019] Figure 4 This is a schematic diagram of the internal structure of the immersion cooling battery pack of the present invention;

[0020] Figure 5 This is a schematic structural diagram of the immersion cooling battery pack of the present invention after removing the battery module;

[0021] Figure 6 This is a schematic diagram of the structure of the battery module and heat dissipation component of the present invention when they are combined. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0023] Example 1:

[0024] like Figure 1 A battery module shown includes several battery cells 2, as well as two end plates 1, several heat dissipation plates 4 and several pressure strips 5. The battery cells 2 are arranged in sequence and fixed between the two end plates 1. Adjacent battery cells 2 are separated by the heat dissipation plates 4 and the pressure strips 5. The end plates 1, battery cells 2, heat dissipation plates 4 and pressure strips 5 are fixed together by binding rings 6 to facilitate overall disassembly and assembly. A wiring harness assembly 3 is provided at the top of each battery cell 2. Each battery cell 2 is connected to a signal line for collecting temperature, current, voltage, etc. The signal line is led to the outside through the groove on the wiring harness assembly 3. The battery cells 2 are connected in series and parallel by copper bus welding.

[0025] Specifically, combined Figure 2 As shown, a heat sink 4 is provided on both sides of the left and right large end faces of each battery cell 2, and a group of pressure strips 5 are provided between two adjacent heat sinks 4. A rectangular cavity that can accommodate a battery cell 2 is formed between the two heat sinks 4 and the two pressure strips 5. The pressure strips 5 are symmetrically arranged on both sides of the battery cell 2 and abut against the small end faces of the side of the battery cell 2, and the thickness of the pressure strips 5 is greater than the thickness of the battery cell 2. One of the heat sinks 4 abuts against one of the end faces of the battery cell 2, and the other heat sink 4 abuts against the two pressure strips 5, so that a gap 7 is formed between the other end face of the battery cell 2 and the other heat sink 4. The surface of the heat sink 4 is coated with a thermally conductive material and is in contact with the battery cell 2. The coolant can enter the gap 7, thereby greatly improving the heat dissipation effect of the battery cell.

[0026] Example 2:

[0027] like Figure 3As shown, this embodiment provides an immersion cooling battery pack, including a shell 8, a cover plate 9 and a coolant filled in the shell 8. A plurality of groups of the above-mentioned battery modules 10 are arranged in the shell 8. The side of the shell 8 has corresponding switches and interfaces, etc. The shell 8 is made of high-strength non-metallic material with lower density, good mechanical properties, corrosion resistance, chemical resistance, and good electrical insulation performance. The bottom plate of the shell 8 adopts the type of corrugated plate to enhance the bending resistance. The shell material itself has a heat insulation effect, so there is no need to lay a heat insulation pad. A foot is set up and placed on the battery rack to increase stability, thereby enhancing the bending strength of the bottom plate. Nuts are inlaid on the bottom plate to fix the battery module 10.

[0028] Specifically, combined Figure 4-6 As shown, the bottom plate in the shell 8 is provided with a plurality of upwardly arched reinforcing ribs 13, which are parallel to each other, and there is a gap between adjacent reinforcing ribs 13, that is, the bottom plate of the shell 8 is designed as a corrugated plate. Compared with the traditional flat plate, its deformation resistance is greatly improved. Bolt holes are pre-buried on the shell 8. After the battery modules 10 are bundled, they are first connected in series and parallel in the battery pack, and finally the positive and negative terminal posts are led out, which can be fixed through the bolt holes on the shell 8. An opening is provided on the front of the shell 8 for leading out high-voltage wires and signal wires, wherein the leading out of the high-voltage wires and signal wires is mechanically sealed by combining flanges and gaskets, which effectively ensures the sealing requirements of the battery pack, and the high-voltage wires and signal wires are led out separately to realize the separation of strong and weak electricity. A sealing gasket is provided between the shell 8 and the cover plate 9, and then fastened with bolts and nuts;

[0029] The shell 8 is filled with coolant 1, the liquid level is no higher than the pole piece and wiring harness assembly, the battery core, copper tube and heat sink are all immersed in coolant 1, the bottom of the shell 8 is provided with a drain hole, the back of the shell 8 is provided with an explosion-proof valve and a drainage cover. In the event of thermal runaway, the gas is collected and discharged from the drainage cover to a designated area;

[0030] The immersion cooling battery pack also includes a heat dissipation component, which includes a plurality of heat dissipation pipes 11 and a water inlet pipe and a water outlet pipe connected to the heat dissipation pipe. The heat dissipation pipe 11 is provided with a confluence component 14 at the inlet and outlet, respectively. The heat dissipation pipe 11 at the inlet passes through the gap between the reinforcing ribs 13 at the bottom end of the battery module 10, extends upward and then passes through the top of the battery module 10 and is connected to the confluence component at the outlet, that is, the heat dissipation pipes 11 are evenly distributed around each battery module 10, and a flow regulating device is provided at the outlet of each branch of the heat dissipation pipe 11. The heat dissipation is more uniform. The heat dissipation pipe 11 is provided with a second coolant. The heat dissipation pipe 11 adopts a copper pipe to form a loop inside the shell. When in the heat dissipation condition, the second coolant enters from the upper interface and flows out from the lower interface; when in the heating condition, the second coolant enters from the lower interface and flows out from the upper interface. The second coolant is connected to the pipeline from the outside, and a confluence component 14 is respectively provided at the inlet and outlet. A flow limiting structure is provided in the lower confluence component to ensure that the flow in each branch copper pipe is evenly distributed.

[0031] In addition, a number of baffles 12 perpendicular to the horizontal plane are provided in the outer shell 8. The baffles 12 are parallel to each other and evenly distributed between the battery modules 10, and the baffles 12 are installed on the heat dissipation pipes 11. On the one hand, heat transfer is achieved through the baffles 12, and on the other hand, the impact generated by the flow of liquid is reduced.

[0032] The utility model can achieve a temperature rise of no more than 5°C during battery operation, and a temperature difference of no more than 2°C between different battery cells, thereby extending the battery life. While acting as a temperature control medium, the coolant can also play a fire-fighting role to a certain extent, reducing the risk of thermal runaway of the battery. Even in extreme cases, when thermal runaway occurs in the battery cell, due to the low boiling point of the insulating solution, the solution will quickly vaporize at the moment of thermal runaway, and a large amount of heat can be taken away very quickly during the vaporization process. At the same time, the heat sink also plays a key role. It effectively isolates the transmission of thermal runaway between battery cells and greatly reduces the adverse effects of thermal runaway. Through these multiple safeguards, the overall safety of the battery pack is greatly improved, providing more reliable protection for users.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "between", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0034] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A battery module comprising a plurality of battery cells, characterized in that: It also includes two end plates, several heat dissipation plates and several pressure strips. The battery cells are fixed between the two end plates. Adjacent battery cells are separated by the heat dissipation plates and the pressure strips, and there is a gap between one of the heat dissipation plates and the end face of the battery cell.

2. The battery module according to claim 1, wherein: A group of pressure strips are arranged between two adjacent heat sinks, and a cavity capable of accommodating the battery cell is formed between the two heat sinks and the two pressure strips. The pressure strips are symmetrically arranged on both sides of the battery cell and abut against the sides of the battery cell, and the thickness of the pressure strips is greater than the thickness of the battery cell. One of the heat sinks abuts against one end face of the battery cell, and the other heat sink abuts against the two pressure strips and forms a gap with the other end face of the battery cell.

3. The battery module according to claim 2, wherein: The end plates, battery cells, heat dissipation plates and pressure strips are fixed together by a binding ring.

4. An immersion-cooled battery pack comprising a housing, a cover, and a coolant filled in the housing, characterized in that: Several battery modules according to any one of claims 1 to 3 are arranged in the shell, and the height of the coolant 1 is higher than the height of the battery cell and lower than the height of the pole piece at the top of the battery cell.

5. The immersion cooling battery pack according to claim 4, characterized in that: The immersion-cooled battery pack also includes a heat dissipation component, which includes a plurality of heat dissipation pipes and a water inlet pipe and a water outlet pipe connected to the heat dissipation pipes. The heat dissipation pipes are evenly distributed around each battery module, and coolant 2 is provided in the heat dissipation pipes.

6. The immersion cooling battery pack according to claim 5, characterized in that: A flow regulating device is provided at the outlet of each branch of the heat dissipation pipe.

7. The immersion cooling battery pack according to claim 5, characterized in that: The bottom plate in the shell is provided with a plurality of upwardly arched wave-shaped reinforcing ribs, with a gap between two adjacent reinforcing ribs, and the battery module is detachably fixed on the reinforcing ribs.

8. The immersion-cooled battery pack according to claim 7, characterized in that: The heat dissipation pipe inlet and outlet are respectively provided with a confluence assembly. The heat dissipation pipe at the inlet passes through the gap between the reinforcing ribs at the bottom end of the battery module, extends upward and then passes through the top end of the battery module and is connected with the confluence assembly at the outlet.

9. The immersion cooling battery pack according to claim 8, characterized in that: A plurality of baffles perpendicular to the horizontal plane are arranged in the shell. The baffles are evenly distributed between the battery modules and are installed on the heat dissipation pipes.

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