CN117855680A

CN117855680A - Immersed cooling energy storage battery pack

Info

Publication number: CN117855680A
Application number: CN202410084023.9A
Authority: CN
Inventors: 李忠照
Original assignee: Suzhou Congyuan Energy Technology Co ltd
Current assignee: Suzhou Congyuan Energy Technology Co ltd
Priority date: 2024-01-19
Filing date: 2024-01-19
Publication date: 2024-04-09

Abstract

The invention provides an immersed cooling energy storage battery pack, comprising: the device comprises at least two rows of cell modules, a cooling liquid return pipe, a shell and at least one group of cooling liquid flow pipe groups, wherein each group of cooling liquid flow pipe groups comprises a cooling liquid split pipe, an inlet pipe and an outlet pipe. The cell modules are arranged in the shell side by side, and each cooling liquid shunt pipe is arranged between two rows of cell modules of at least two rows of cell modules. For every group of coolant flow nest of tubes, the coolant shunt tubes of this group are provided with a plurality of through-holes and one end and the import pipe fixed connection of this group, and the other end fixed connection is in the back wall of casing, the export pipe and the coolant return pipe fixed connection of fixed mounting between at least two rows of electric core modules and front wall of this group, and the both ends of coolant return pipe are provided with the opening, are equipped with first runner between two adjacent electric cores in every electric core module, are close to being equipped with the second runner between electric core and the two lateral walls of casing. The invention can improve the safety of the energy storage system and the battery pack.

Description

Immersed cooling energy storage battery pack

Technical Field

The invention relates to the field of energy storage, in particular to an immersed cooling energy storage battery pack.

Background

The problems of energy shortage, environmental pollution and the like are becoming serious at present, and measures for enhancing environmental protection, saving resources, developing novel energy and the like are proposed at home and abroad, and under the environment, new energy gradually becomes an important measure for solving the environmental problem and the energy problem.

Along with the rapid development and application of new energy, the energy storage technology is also greatly popularized, and is an important support for the rapid development of new energy. The energy storage technology refers to a technology for storing and utilizing new energy by utilizing energy storage equipment such as a battery, a super capacitor and the like, and the energy storage modes comprise electrochemical energy storage, electromagnetic energy storage, physical energy storage, phase change energy storage and the like.

Electrochemical energy storage has the advantages of low cost, long service life, high energy density, adaptability to various environments and the like, and becomes the most main energy storage mode at present. Electrochemical energy storage can be divided into energy storage modes such as lithium ion batteries, lead-acid batteries, flow batteries, nickel-cadmium batteries and the like according to different energy storage devices. The energy storage efficiency of the lithium ion power battery is above 85%, the lithium ion power battery is superior to the energy storage efficiency of other batteries, and meanwhile, the lithium ion power battery has the characteristics of high energy conversion efficiency, long cycle service life, low production cost, convenience in recovery and the like, and has good development prospect and popularization value in the technical field of energy storage.

With the gradual increase of the capacity of the lithium ion battery, the increase of the number of the whole package of the battery cores and the response to the charging requirements of different multiplying powers, the method brings higher requirements for the design and optimization of a lithium ion battery thermal management system, and the optimal working temperature range of the energy storage battery core is difficult to meet by the traditional air cooling and indirect liquid cooling technology.

The existing air-cooled energy storage battery pack is low in price, but the specific heat and the heat conduction coefficient of air are too low, so that the heat dissipation efficiency of the battery cell is too low, when the battery cell is in thermal runaway, the air is arranged around the battery cell, the thermal runaway of the battery cell can be promoted, and the safety is low. In addition, due to low cooling efficiency, each battery pack generally does not exceed 16 battery cells, so that the total energy density of the energy storage system is low, and the occupied space is large.

Compared with air cooling, the existing energy storage liquid cooling battery pack adopting the liquid cooling plate type has the advantages that the specific heat and the heat conduction coefficient of the cooling liquid are obviously improved compared with those of air, and the cooling performance is improved, but a large-area cold plate is additionally added, namely the weight and the cost are increased. In addition, the liquid cooling plate can only contact with one surface of the battery core, so that only one cooling surface is provided, and if the cooling surface is required to be added, one liquid cooling plate is required to be added, and the cost is further increased. Only cooling one face of the battery core can lead to uneven temperature at different positions of the battery core body, temperature difference of the battery core is easy to cause, the battery core is easy to expand after long-term use, service life of the battery core is influenced, and safety of an immersed cooling energy storage battery pack and an energy storage system is reduced.

Disclosure of Invention

The invention provides an immersed cooling energy storage battery pack, which can improve the safety of the immersed cooling energy storage battery pack and an energy storage system. The specific technical scheme is as follows.

In a first aspect, the present invention provides an immersion cooling energy storage battery pack comprising: the device comprises at least two rows of cell modules, a cooling liquid return pipe, a shell and at least one group of cooling liquid flow pipe groups, wherein each group of cooling liquid flow pipe groups comprises a cooling liquid split pipe, an inlet pipe and an outlet pipe;

the at least two rows of cell modules are arranged in the shell side by side, and each cooling liquid shunt pipe is arranged between the two rows of cell modules of the at least two rows of cell modules;

for each group of cooling liquid flow tube groups, the cooling liquid flow dividing tube of the group is provided with a plurality of through holes, the inlet tube of the group passes through the front wall of the shell and is fixedly connected with one end of the cooling liquid flow dividing tube of the group, the other end of the cooling liquid flow dividing tube of the group is fixedly connected with the rear wall of the shell, the outlet tube of the group is parallel to the inlet tube of the group, the outlet tube of the group passes through the front wall and is fixedly connected with the cooling liquid return tube, and the cooling liquid return tube is fixedly arranged between the at least two rows of cell modules and the front wall;

The cooling liquid reflux pipe is characterized in that openings are formed in the two ends of the cooling liquid reflux pipe, gaps exist between the two ends of the cooling liquid reflux pipe and the two side walls of the shell, a first flow channel is arranged between two adjacent electric cores in each electric core module, and a second flow channel is arranged between the electric core close to the two side walls of the shell and the two side walls.

Optionally, the submerged cooling energy storage battery pack further comprises a plurality of heat insulation pads;

at least one heat insulation pad is fixedly installed between two adjacent electric cores in each electric core module, and the ratio of the total width of the at least one heat insulation pad to the height of the side face of the electric core installed is in a preset range.

Optionally, three strip-shaped heat insulation pads are fixedly arranged between two adjacent electric cores in each electric core module at equal intervals from top to bottom.

Optionally, the submerged cooling energy storage battery pack further comprises a plurality of support bars;

at least one supporting bar is fixedly arranged between the bottom of each cell module and the bottom wall of the shell.

Optionally, the coolant shunt tubes of each set of coolant flow tube sets are circular tubes, and the intervals between the plurality of through holes are equal.

Optionally, the length of the cooling liquid return pipe is greater than a preset length threshold.

Optionally, the immersed cooling energy storage battery pack further comprises an upper cover, wherein the upper cover is fixedly connected with the shell, and a third runner is arranged between the upper cover and the at least two rows of cell modules.

Optionally, each row of electric core module includes two module end plates and a plurality of electric core, a plurality of electric core are arranged in a row, two module end plates are located the end to end position of this row electric core respectively, the bottom fixed connection of two module end plates in the diapire of casing.

Optionally, the submerged cooling energy storage battery pack includes a set of coolant flow tube sets, and coolant shunt tubes of the set of coolant flow tube sets are disposed between two rows of core modules located in the center of the at least two rows of core modules.

Optionally, the at least two rows of cell modules are 4 rows of cell modules, and each row of cell modules comprises 12 cells.

As can be seen from the above, the submerged cooling energy storage battery pack provided by the embodiment of the invention includes: the device comprises at least two rows of cell modules, a cooling liquid return pipe, a shell and at least one group of cooling liquid flow pipe groups, wherein each group of cooling liquid flow pipe groups comprises a cooling liquid split pipe, an inlet pipe and an outlet pipe. The at least two rows of cell modules are arranged in the shell side by side, and each cooling liquid shunt pipe is arranged between the two rows of cell modules of the at least two rows of cell modules. For every group of coolant flow nest of tubes, the coolant shunt tubes of this group are provided with a plurality of through-holes, and the import pipe of this group passes the front wall of casing and the one end fixed connection of coolant shunt tubes of this group, the other end fixed connection of coolant shunt tubes of this group in the back wall of casing, the export pipe of this group with the import pipe parallel arrangement of this group, the export pipe of this group pass the front wall with coolant return pipe fixed connection, coolant return pipe fixed mounting in at least two rows of electric core modules with between the front wall, coolant return pipe's both ends are provided with the opening, coolant return pipe's both ends with there is the space between two lateral walls of casing, be equipped with first runner between two adjacent electric cores in every electric core module, be close to be equipped with the second runner between electric core and the two lateral walls of casing. Therefore, the inlet pipes of each group, the cooling liquid shunt pipes of each group, the first flow channels, the second flow channels, the cooling liquid reflux pipes and the outlet pipes of each group form unique cooling flow channels of cooling liquid, the cooling liquid is distributed to the first flow channels through the cooling liquid shunt pipes of each group, then flows into the cooling liquid reflux pipes through the second flow channels, flows into the outlet pipes of each group through the cooling liquid reflux pipes, so that the cooling liquid uniformly flows on each side surface of each cell close to the first flow channels and the second flow channels in the immersed cooling energy storage battery pack, the heat dissipation performance of the immersed cooling energy storage battery pack is improved, the cooling liquid plates are not required to be added, the sides of the cell can be cooled, the weight and the cost are reduced, the cooling liquid can ensure the temperature uniformity of the cell at different positions, the temperature uniformity of the cell is improved, the expansion amount of the cell is also reduced, the service lives of the cell pack and the energy storage system are prolonged, and the safety of the immersed cooling energy storage battery pack is further improved.

The innovation points of the embodiment of the invention include:

1. the cooling liquid is distributed to the first flow channels through the cooling liquid flow dividing pipes of each group, then flows into the cooling liquid flow returning pipes through the second flow channels of each group, and flows into the outlet pipes of each group through the cooling liquid flow returning pipes, so that the cooling liquid uniformly flows on each side surface of each battery core in the immersed cooling energy storage battery pack, which is close to the first flow channels and the second flow channels, the heat dispersion of the immersed cooling energy storage battery pack is improved, a plurality of side surfaces of the battery core can be cooled without adding a cooling liquid plate, the weight and the cost are reduced, the cooling liquid can ensure the temperature uniformity of different positions of the battery core, the temperature uniformity of the battery core is improved, the expansion amount of the battery core is also reduced, the service lives of the immersed cooling energy storage battery pack and an energy storage system are prolonged, and the safety of the immersed cooling energy storage battery pack is further improved.

2. The mode that a plurality of through holes are distributed at equal intervals ensures that the side face of each battery cell has even cooling liquid inflow.

3. Through setting up the mode that the through-hole aimed at corresponding first runner for coolant liquid can follow the even outflow in the through-hole, and enter into in the first runner fast, increased heat radiating area, improved the temperature homogeneity of heat dissipation rate and electric core.

4. Because the cost of the round pipe is low, when the cooling liquid shunt pipe is the round pipe, the cost is reduced, and the process of opening holes in the round pipe is simple, and the cost of opening holes is also reduced.

5. When one end of the cooling liquid shunt tube is in threaded connection with the inlet tube, and the other end of the cooling liquid shunt tube is in threaded connection with the rear wall, the installation process of the cooling liquid shunt tube is simplified, and the installation efficiency and convenience are improved.

6. The cooling liquid exchanges heat with the cooling liquid filled outside the cooling liquid return pipe through the pipe wall of the cooling liquid return pipe in the cooling liquid return pipe, so that the cooling liquid which absorbs the heat of the battery cell through the first round exchanges heat for the second round, thereby taking away the heat in the immersed cooling energy storage battery pack, realizing that the cooling liquid still dissipates heat when flowing out, prolonging the whole heat dissipation path in the immersed cooling energy storage battery pack, and better playing the immersed cooling advantage.

7. Through the both ends of coolant liquid back flow be provided with the open-ended mode for in the coolant liquid that absorbs the heat of electric core through first round can enter into the coolant liquid back flow, reduced the pressure drop in the battery package, then flow from the outlet pipe of each group, because the inlet pipe and the outlet pipe of each group all pass the antetheca, make the coolant liquid can follow same side and go out, come out from the one side of antetheca promptly, avoided the coolant liquid to get into out the pipe and lead to energy storage box space increase at the different faces of casing, thereby reduced the volume of submerged cooling energy storage battery package, also make things convenient for and install and dismantle between inlet pipe and the outlet pipe of each group and other parts.

8. The length of the cooling liquid return pipe is larger than the preset length threshold value, so that the positions of the through holes of the cooling liquid shunt pipes are opened at the two ends of the cooling liquid return pipe, the flow path of cooling liquid in the battery pack is prolonged, the cooling liquid has sufficient cooling time for each battery cell, uniform fluid entering between every two adjacent battery cells is ensured, and the battery cells are cooled.

9. When the battery core is in thermal runaway, the cooling liquid flowing through the plurality of sides of the battery core can simultaneously take away the heat of different positions of the battery core in thermal runaway, so that the heat transferred to other battery cores by the battery core in thermal runaway is reduced, and the thermal diffusion risk is reduced.

10. Through setting up the mode that the ratio of the total width of at least one heat insulating mattress and the height of the side of the electric core of installing in is in predetermineeing the within range, ensure that the runner between two adjacent electric cores is wide enough, satisfy the cooling of the big face of electric core for can have more area heat dissipation with the electric core when the coolant liquid flows through between the electric core, prevent that electric core temperature rise is too fast. The existence of the heat insulation pad also plays a supporting role between the battery cells, and can play a part of heat insulation role due to the existence of the heat insulation pad in thermal runaway. The miniaturized heat insulation pad can give more space, increases the contact area of the cooling liquid and the side face of the battery cell, and improves the heat dissipation capacity. Meanwhile, the expansion amount of the battery cells caused by the battery cells after the battery cells are used for a long time can be reduced, the situation that the battery cells reduce liquid flowing between the battery cells due to the fact that the battery cells are expanded to compress original gaps between the battery cells is avoided, after the battery cells are used for a long time, the first flow channels between the battery cells can still keep circulating, therefore, the performance change of the energy storage system is small, and the service life of the energy storage system is prolonged. And the design of the small heat insulation pad has less materials and light weight, and simultaneously reduces the cost of the immersed cooling energy storage battery pack.

11. Compared with the condition that only one heat insulation pad exists, the arrangement of the three long-strip-shaped heat insulation pads with equal intervals between the upper part, the middle part and the lower part can enable the upper part, the middle part and the lower part of the battery cell to be supported, so that the local stress is avoided to be overlarge, and the runner is prevented from being extruded.

12. By arranging the third flow channel between the upper cover and the at least two rows of cell modules, cooling liquid can flow through the upper ends of the at least two rows of cell modules and then flow into the cooling liquid return pipe through the second flow channel, and then flow into the outlet pipes of each group through the cooling liquid return pipe, so that the top surfaces of the cells in the immersed cooling energy storage battery pack have uniform cooling liquid flowing, and the heat dissipation performance of the immersed cooling energy storage battery pack is improved.

13. Through the mode that at least one support bar is fixedly arranged between the bottom of each cell module and the bottom wall of the shell, cooling liquid can flow between the bottom of the cell module and the bottom of the shell, then flow into a cooling liquid return pipe through a second flow passage, and then flow into outlet pipes of each group through the cooling liquid return pipe, so that uniform cooling liquid flows through the bottom surface of each cell in the immersed cooling energy storage battery pack, and the heat dissipation performance of the immersed cooling energy storage battery pack is improved.

14. Through at the bottom of every electric core module with a support bar of fixed mounting between the diapire of casing, and to every electric core module, this support bar extends to the mode of afterbody from the head of electric core module for the support bar can support the bottom of every electric core of electric core module, simultaneously, can make the coolant liquid flow between the bottom of electric core module and the bottom of casing, thereby in time cool off the bottom of electric core module.

15. Through at every electric core of every electric core module the bottom with a support bar of fixed mounting between the diapire of casing, and to every electric core, this support bar sets up the mode along the length direction of this electric core bottom for every support bar can support the bottom of every electric core, simultaneously, can make the coolant liquid flow between the bottom of electric core module and the bottom of casing, thereby in time cool off the bottom of electric core module.

16. Through the bottom of every electric core module with 2 support bars of fixed mounting between the diapire of casing, and to every electric core, two support bars are along the length direction parallel arrangement's of this electric core bottom mode for two support bars can support the bottom of every electric core, compare in the mode of a support bar, more firm, simultaneously, can make the coolant liquid flow between the bottom of electric core module and the bottom of casing, thereby in time cool off the bottom of electric core module.

17. Through the mode that sets up coolant liquid shunt tubes between two rows of electric core modules that lie in the center of two rows of electric core modules at least for coolant liquid flows to both sides from intermediate position, has guaranteed the temperature uniformity of electric core on both sides, has also saved the space simultaneously.

18. According to the invention, the electric core is directly cooled by adopting the immersed structure, and the flow channels are respectively arranged between the electric core and the electric core, between the electric core and the upper cover and between the electric core and the shell, so that six surfaces of the electric core are contacted with the insulating cooling liquid, the heat exchange area of the electric core is increased, and the temperature distribution of the electric core is more uniform.

Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the invention. Other figures may be derived from these figures without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic view of a first angle of an immersion cooling energy storage battery pack according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second angle of an immersed cooling energy storage battery pack according to an embodiment of the present invention;

FIG. 3 is a schematic view of a coolant shunt according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a third angle of an immersed cooling energy storage battery pack according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of an angle of an immersion cooling energy storage battery pack according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a battery cell and a heat insulation pad according to an embodiment of the present invention.

In fig. 1 to 6, a cooling liquid return pipe 1, an opening 110, a casing 2, a front wall 21, a rear wall 22, a side wall 23, a bottom wall 24, a cooling liquid shunt pipe 3, a through hole 31, an inlet pipe 4, an outlet pipe 5, a battery cell 6, a first runner 7, a second runner 8, a heat insulation pad 9, an upper runner 91, a lower runner 92, an upper cover 10, a third runner 11, a support bar 12, a fourth runner 13, a fifth runner 14, a module end plate 15, a sixth runner 16 and a sealing ring 17 are arranged.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.

It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. A process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.

The embodiment of the invention discloses an immersed cooling energy storage battery pack, which can improve the safety of an energy storage system and the immersed cooling energy storage battery pack. The following describes embodiments of the present invention in detail.

Fig. 1 is a schematic structural diagram of a first angle of an immersion cooling energy storage battery pack according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a second angle of an immersion cooling energy storage battery pack according to an embodiment of the present invention.

Referring to fig. 1 and 2, an immersion cooling energy storage battery pack according to an embodiment of the present invention includes: at least two rows of cell modules, a cooling fluid return pipe 1, a housing 2 and at least one set of cooling fluid flow tube sets, wherein each set of cooling fluid flow tube sets comprises a cooling fluid shunt pipe 3, an inlet pipe 4 and an outlet pipe 5.

The at least two rows of cell modules are arranged in the shell 2 side by side, and each cooling liquid shunt tube 3 is arranged between the two rows of cell modules of the at least two rows of cell modules. In the embodiment of the present invention, the shape of the coolant return pipe 1 and the shape of the coolant shunt pipe 3 are not limited at all, as long as the functions thereof in the embodiment of the present invention can be realized.

Fig. 3 is a schematic structural diagram of a coolant shunt tube 3 according to an embodiment of the present invention, referring to fig. 1-3, for each set of coolant flow tube sets, the coolant shunt tube 3 of the set is provided with a plurality of through holes 31, where, in the embodiment of the present invention, the shape of the coolant shunt tube 3 is not limited in this respect, and the coolant shunt tube 3 may be a circular tube, an elliptical tube, or a waist Kong Xingguan, for example.

The positions and shapes of the openings 31 are not limited in any way, and the plurality of through holes 31 are illustratively uniformly distributed as shown in fig. 3, i.e. the intervals between the plurality of through holes 31 are equal; the through hole 31 may be a circular hole or a kidney-shaped hole; the number of through holes 31 is at least 4, and preferably, the number of through holes 31 is 12.

Thus, the uniform distribution of the plurality of through holes 31 ensures that the cooling fluid flows into the side of each cell uniformly.

With continued reference to fig. 1-3, in one implementation, each through-hole 31 is aligned with a respective first flow channel 7.

That is, the number of through holes 31 is the same as the number of first flow channels 7 between the cells 6 included in the adjacent row of the cell modules, and if the adjacent row of the cell modules includes 12 cells 6, the number of first flow channels 7 is 11, and the number of through holes 31 is 11.

Therefore, by arranging the through holes 31 to align with the corresponding first flow channels 7, the cooling liquid can uniformly flow out of the through holes 31 and rapidly enter the first flow channels 7, so that the heat dissipation area is increased, and the heat dissipation speed and the temperature uniformity of the battery cells 6 are improved.

Because the cost of the round tube is low, when the cooling liquid shunt tube 3 is the round tube, the cost is reduced, and the process of perforating the round tube is simple, and the perforating cost is also reduced.

Fig. 4 is a schematic structural diagram of a third angle of an immersion cooling energy storage battery pack according to an embodiment of the present invention. Referring to fig. 1-4, the inlet pipe 4 of the group is fixedly connected to one end of the coolant shunt pipe 3 of the group through the front wall 21 of the housing 2, and the other end of the coolant shunt pipe 3 of the group is fixedly connected to the rear wall 22 of the housing 2, wherein the embodiment of the present invention does not limit the specific manner of the fixed connection, and the exemplary manner of the fixed connection may be a threaded connection or a welding.

When one end of the cooling liquid shunt tube 3 is in threaded connection with the inlet tube 4, and the other end of the cooling liquid shunt tube is in threaded connection with the rear wall 22, the installation process of the cooling liquid shunt tube 3 is simplified, and the installation efficiency and convenience are improved.

The outlet pipes 5 of the group are arranged in parallel with the inlet pipes 4 of the group, and the outlet pipes 5 of the group are fixedly connected with the cooling liquid return pipe 1 through the front wall 21, wherein the embodiment of the invention is not limited in any way, and the fixing connection can be screw connection or welding by way of example.

With continued reference to fig. 1-4, the coolant return pipe 1 is fixedly mounted between the at least two rows of battery modules and the front wall 21, wherein the coolant return pipe 1 and the inlet pipe 4 and the outlet pipe 5 of the group are arranged in a plurality of ways, including but not limited to the following ways:

the first way is:

the inlet pipe 4 is up and the outlet pipe 5 is down.

At this time, the coolant return pipe 1 is fixedly mounted on the bottom wall of the housing 2 between at least two rows of the cell modules and the front wall 21.

The second way is:

the inlet pipe 4 is up and the outlet pipe 5 is down.

The immersed cooling energy storage battery pack provided by the embodiment of the invention further comprises an upper cover, and at this time, the cooling liquid return pipe 1 is fixedly arranged on the inner wall of the upper cover between at least two rows of cell modules and the front wall 21.

Of course, other ways of dynamically adjusting the relative heights of the inlet pipe 4 and the outlet pipe 5 are possible, and are within the scope of the present invention.

With continued reference to fig. 1-4, openings 110 are provided at two ends of the cooling liquid return pipe 1, a gap exists between two ends of the cooling liquid return pipe 1 and two side walls 23 of the housing 2, a first flow channel 7 is provided between two adjacent cells 6 in each cell module, and a second flow channel 8 is provided between a cell 6 near two side walls 23 of the housing 2 and two side walls 23.

That is, the gaps between two adjacent cells 6 in each cell module form a first flow channel 7, and the cells 6 near two side walls 22 of the housing 2 and the gaps between the two side walls 22 form a second flow channel 8, wherein the number of the first flow channels 7 depends on the number of the cells 6, and the number of the second flow channels 8 is 2.

Illustratively, referring to fig. 2, the coolant return pipe 1 is parallel to the front wall 21 of the housing 2.

The shape of the cooling liquid return pipe 1 is not limited in the embodiment of the invention, and the cooling liquid return pipe 1 can be a round pipe, an elliptic pipe or a waist Kong Xingguan, preferably, the cooling liquid return pipe 1 is a round pipe, so that the cost is greatly reduced; the cooling liquid return pipe 1 adopts a small-diameter pipeline, so that a sufficient space is provided for installing the cooling liquid shunt pipe 3. The diameter of the coolant return pipe 1 is, for example, less than 25mm.

In operation, the cooling liquid enters the cooling liquid shunt tubes 3 of each group through the inlet tubes 4 of each group and evenly flows out from the through holes 31, flows into the first flow channel 7 between two adjacent electric cores 6 in each electric core module, thereby taking away the heat of the large side surface of each electric core 6 to realize the first wheel absorption of the heat of the electric core 6, and the cooling liquid takes away the heat of the large side surface of the electric core 6 and then is converged to the second flow channels 8 on two sides.

The cooling liquid exchanges heat with the cooling liquid filled outside the cooling liquid return pipe 1 through the pipe wall of the cooling liquid return pipe 1 in the cooling liquid return pipe 1, so that the cooling liquid which absorbs the heat of the battery core 6 through the first round exchanges heat for the second round, thereby taking away the heat in the submerged cooling energy storage battery pack, realizing that the cooling liquid still dissipates heat when flowing out, prolonging the whole heat dissipation path in the submerged cooling energy storage battery pack, and better playing the submerged cooling advantage.

Moreover, through the mode that the opening 110 is arranged at the two ends of the cooling liquid return pipe 1, the cooling liquid which passes through the first wheel to absorb the heat of the battery core 6 can enter the cooling liquid return pipe 1, the pressure drop in the battery pack is reduced, and then flows out of the outlet pipes 5 of each group, and as the inlet pipes 4 and the outlet pipes 5 of each group pass through the front wall 21, the cooling liquid can come out from the same side, namely one side of the front wall 21, so that the increase of the space of the energy storage box body caused by the cooling liquid inlet and outlet pipes on different sides of the shell 2 is avoided, the volume of the immersed cooling energy storage battery pack is reduced, and the installation and the disassembly between the inlet pipes 4 and the outlet pipes 5 of each group and other parts are also convenient.

With continued reference to fig. 2, the length of the coolant return pipe 1 is greater than a preset length threshold. Illustratively, the length of the coolant return pipe 1 is greater than 2 times the length of the battery cell 6.

Therefore, by setting the length of the cooling liquid return pipe 1 to be greater than the preset length threshold value, the openings 110 at the two ends of the cooling liquid return pipe 1 are originally away from the positions of the through holes 31 of the cooling liquid shunt pipes 3, so that the flow path of cooling liquid in the battery pack is prolonged, the cooling liquid has sufficient cooling time for each cell 6, uniform fluid entering between every two adjacent cells 6 is ensured, and the cells 6 are cooled.

Fig. 5 is a schematic cross-sectional view of an angle of the submerged cooling energy storage battery pack according to the embodiment of the present invention, referring to fig. 5, it can be seen that the inlet pipe 4 and the outlet pipe 5 of each group are of a double-layer design, that is, the inflow and outflow of the cooling liquid in the submerged cooling energy storage battery pack are of a double-layer design, and the distribution of the cooling liquid and the outflow of the cooling liquid after confluence are independent when the cooling liquid flows in, so that the fluids do not interfere with each other.

As can be seen from the above, the submerged cooling energy storage battery pack according to the embodiment of the present invention includes: at least two rows of cell modules, a cooling fluid return pipe 1, a housing 2 and at least one set of cooling fluid flow tube sets, wherein each set of cooling fluid flow tube sets comprises a cooling fluid shunt pipe 3, an inlet pipe 4 and an outlet pipe 5. The at least two rows of cell modules are arranged in the shell 2 side by side, and each cooling liquid shunt tube 3 is arranged between the two rows of cell modules of the at least two rows of cell modules. For each group of cooling fluid flow tube sets, the cooling fluid flow tube set 3 of the group is provided with a plurality of through holes 31, the inlet tube 4 of the group passes through the front wall 21 of the shell 2 and one end of the cooling fluid flow tube set 3 of the group is fixedly connected, the other end of the cooling fluid flow tube set 3 of the group is fixedly connected with the rear wall 22 of the shell 2, the outlet tube 5 of the group is arranged in parallel with the inlet tube 4 of the group, the outlet tube 5 of the group passes through the front wall 21 and is fixedly connected with the cooling fluid return tube 1, the cooling fluid return tube 1 is fixedly installed between at least two rows of cell modules and the front wall 21, openings 110 are formed at two ends of the cooling fluid return tube 1 and two side walls 23 of the shell 2, a first flow channel 7 is arranged between two adjacent cells 6 in each cell module, and a second flow channel 8 is arranged between the cell 6 and the two side walls 23 close to the two side walls 23 of the shell 2. Therefore, the inlet pipes 4 of each group, the cooling liquid shunt pipes 3 of each group, the first flow channels 7, the second flow channels 8, the cooling liquid return pipes 1 and the outlet pipes 5 of each group form unique cooling flow channels for cooling liquid, the cooling liquid is distributed to the first flow channels 7 through the cooling liquid shunt pipes 3 of each group, then flows into the cooling liquid return pipes 1 through the second flow channels 8 from the first flow channels 7, flows into the outlet pipes 5 of each group from the cooling liquid return pipes 1, so that uniform cooling liquid flows through each side surface of each electric core 6 in the immersed cooling energy storage battery pack close to the first flow channels 7 and the second flow channels 8, the cooling performance of the immersed cooling energy storage battery pack is improved, a plurality of side surfaces of the electric core 6 can be cooled without adding cooling liquid plates, the weight and the cost are reduced, the temperature uniformity of the electric core 6 can be guaranteed by the cooling liquid at different positions of the plurality of side surfaces, the temperature uniformity of the electric core 6 is improved, the expansion quantity of the electric core 6 is also reduced, the service life of the immersed cooling energy storage battery pack and the energy storage battery pack is prolonged, and the safety of the immersed cooling energy storage battery pack is further improved.

And, when the electric core 6 is in thermal runaway, the cooling liquid flowing through a plurality of sides of the electric core 6 can simultaneously take away the heat of different positions of the electric core 6 in thermal runaway, so that the heat transferred to other electric cores 6 by the electric core 6 in thermal runaway is reduced, and the heat diffusion risk is reduced.

In order to reduce the heat generated by the battery cells during thermal runaway from other battery cells and reduce the risk of thermal diffusion, large heat insulation pads are adopted between the battery cells of the existing battery pack, which obviously increases the cost and the weight. If the energy storage battery pack adopts the immersion cooling technology, the heat insulation pad between the battery cells can not allow cooling liquid to enter between the battery cells to cool the battery cells, so that the cooling area is greatly reduced, and the characteristics of immersion cooling can not be fully exerted.

Fig. 6 is a schematic structural diagram of a cell and a heat insulation pad according to an embodiment of the present invention, and referring to fig. 6, the submerged cooling energy storage battery pack according to an embodiment of the present invention further includes a plurality of heat insulation pads 9, at least one heat insulation pad 9 is fixedly installed between two adjacent cells 6 in each cell module, and a ratio of a total width of at least one heat insulation pad 9 to a height of a side surface of the installed cell 6 is within a preset range.

Illustratively, the width of one insulation pad 9 is 10mm; the preset range is 10% -80%.

In the embodiment of the present invention, the number and shape of the heat insulation pads 9 are not limited, and one or more heat insulation pads 9 may be installed between two adjacent cells 6, and the ratio of the total width of the installed heat insulation pads 9 to the height of the side of the installed cell 6 is within a preset range no matter how many heat insulation pads 9 are installed. When one is installed, the total width of the installed heat insulation pad 9 is the width of one heat insulation pad 9, and when a plurality is installed, the total width of the installed heat insulation pad 9 is the sum of the widths of the plurality of heat insulation pads 9.

Therefore, by setting the ratio of the total width of at least one heat insulation pad 9 to the height of the side face of the installed battery cell 6 within a preset range, the flow channel between two adjacent battery cells 6 is ensured to be wide enough, the large-surface cooling of the battery cells 6 is met, more areas can be used for heat dissipation with the battery cells 6 when cooling liquid flows between the battery cells 6, and the temperature rise of the battery cells is prevented from being too fast. The heat insulation pad 9 also plays a supporting role between the battery cells 6 and 6, and can play a part of heat insulation role due to the heat insulation pad 9 in the case of thermal runaway. The miniaturized heat insulation pad can give more space, increases the contact area of the cooling liquid and the side face of the battery cell 6, and improves the heat dissipation capacity. Meanwhile, the expansion amount of the battery cells 6 caused by the battery cells 6 after the battery cells 6 are used for a long time can be reduced, the phenomenon that the cooling liquid flows through the battery cells 6 due to the fact that the original gaps between the battery cells 6 are compressed due to expansion of the battery cells 6 is avoided, after the battery cells are used for a long time, the first flow channels 7 between the battery cells 6 can still keep circulation, therefore, the performance change of the energy storage system is small, and the service life of the energy storage system is prolonged. And the design of the small heat insulation pad 9 has the advantages of less material and light weight, and simultaneously reduces the cost of the immersed cooling energy storage battery pack.

With continued reference to fig. 4 and 6, in one implementation, three elongated thermal insulation pads are fixedly mounted between two adjacent cells in each cell module at equal intervals from top to bottom. The three elongated heat insulating mats divide two adjacent cells into 2 channels, namely an upper channel 91 and a lower channel 92. Compared with the condition that only one heat insulation pad exists, the arrangement of the three long-strip-shaped heat insulation pads with equal intervals between the upper part, the middle part and the lower part can enable the upper part, the middle part and the lower part of the battery cell to be supported, so that the local stress is avoided to be overlarge, and the runner is prevented from being extruded.

With continued reference to fig. 5, the submerged cooling energy storage battery pack provided by the embodiment of the present invention further includes an upper cover 10, where the upper cover 10 is fixedly connected with the housing 2, and a third flow channel 11 is disposed between the upper cover 10 and the at least two rows of core cell modules.

That is, the upper parts of at least two rows of the cell modules are not adhered to the upper cover 10, but have a gap, and the gap forms the flow channel 11.

Therefore, by arranging the third flow channel 11 between the upper cover 10 and the at least two rows of cell modules, the cooling liquid can flow through the upper ends of the at least two rows of cell modules and then flow into the cooling liquid return pipe 1 through the second flow channel 8, and then flow into the outlet pipes 5 of each group through the cooling liquid return pipe 1, so that the top surfaces of the cells 6 in the immersed cooling energy storage battery pack have uniform cooling liquid flowing, and the heat dissipation performance of the immersed cooling energy storage battery pack is improved.

With continued reference to fig. 4, in one implementation, the submerged cooling energy storage battery pack provided by the embodiment of the present invention further includes a sealing ring 17, where the sealing ring 17 is installed in the groove of the housing 2, and plays a role in sealing when the upper cover 10 is covered with the housing 2.

In order to solve the problem that the bottom of the battery cell cannot be cooled in time because the bottom of the battery cell of the conventional battery pack is directly fixed on the bottom wall of the housing, and referring to fig. 4 and 5, the submerged cooling energy storage battery pack provided by the embodiment of the invention further includes a plurality of support bars 12, at least one support bar 12 is fixedly installed between the bottom of each battery cell module and the bottom wall 24 of the housing 2. The shape of the support bar 12 is not limited in the embodiment of the present invention, and the support bar 12 may be a long-strip support bar or a circular support bar.

Therefore, by means of at least fixedly installing one support bar 12 between the bottom of each cell module and the bottom wall 24 of the shell 2, the cooling liquid can flow between the bottom of the cell module and the bottom 24 of the shell 2, then flow into the cooling liquid return pipe 1 through the second flow channel 8, and then flow into the outlet pipes 5 of each group through the cooling liquid return pipe 1, so that the cooling liquid uniformly flows through the bottom surfaces of the cells 6 in the submerged cooling energy storage battery pack, and the heat dissipation performance of the submerged cooling energy storage battery pack is improved.

In the present embodiment, the support bars 12 are arranged in a plurality of ways, including but not limited to the following three ways:

the first way is:

a support bar 12 is fixedly mounted between the bottom of each cell module and the bottom wall 24 of the housing 2.

That is, there are several cell modules, and several support bars 12 are provided. For each cell module, the support bar 12 extends from the front to the rear of the cell module so that the bottom of each cell 6 of the cell module can be supported.

Therefore, by fixedly mounting one support bar 12 between the bottom of each cell module and the bottom wall 24 of the housing 2, and for each cell module, the support bar 12 extends from the head to the tail of the cell module, so that the support bar 12 can support the bottom of each cell 6 of the cell module, and at the same time, cooling liquid can flow between the bottom of the cell module and the bottom 24 of the housing 2, thereby timely cooling the bottom of the cell module.

The second way is:

a support bar 12 is fixedly arranged between the bottom of each cell module and the bottom wall 24 of the housing 2.

That is to say, several cells 6, several support bars 12 are provided. For each cell 6, the support bar 12 is disposed along the length direction of the bottom of the cell 6, so that the bottom of the cell 6 can be supported.

From this, through the fixed mounting of a support bar 12 between the bottom of each electric core of every electric core module and the diapire 24 of casing 2, and for every electric core 6, this support bar 12 sets up the mode along the length direction of this electric core 6 bottom for every support bar 12 can support the bottom of every electric core 6, simultaneously, can make the coolant liquid flow between the bottom of electric core module and the bottom 24 of casing 2, thereby in time cool off the bottom of electric core module.

Third mode:

2 support bars 12 are fixedly arranged between the bottom of each cell module and the bottom wall 24 of the shell 2.

For each cell 6, two support bars 12 are arranged in parallel along the length direction of the bottom of the cell 6, so that the bottom of the cell 6 can be supported. A fourth flow channel 13 is formed between two support bars 12 at the bottom of the same cell 6, and a fifth flow channel 14 is formed between two adjacent support bars 12 at the bottom of two adjacent cells 6.

From this, through the bottom of every electric core module with 2 support bars 12 of fixed mounting between the diapire 24 of casing 2, and to every electric core 6, the mode of the length direction parallel arrangement of two support bars 12 along this electric core 6 bottom for two support bars 12 can support the bottom of every electric core 6, compare in the mode of a support bar 12, more firm, simultaneously, can make the coolant liquid flow between the bottom of electric core module and the bottom 24 of casing 2, thereby in time cool off the bottom of electric core module.

With continued reference to fig. 2, each row of cell modules includes two module end plates 15 and a plurality of cells 6, the plurality of cells 6 are arranged in a row, the two module end plates 15 are respectively located at the front-to-rear positions of the row of cells 6, the bottoms of the two module end plates 15 are fixedly connected to the bottom wall 24 of the housing 2, and then the plurality of cells 6 located between the two module end plates 15 are fixed by a binding belt.

In one implementation, when the submerged cooling energy storage battery pack comprises a set of coolant flow tube sets with coolant shunt tubes 3 disposed between two centrally located rows of cell modules of the at least two rows of cell modules.

Therefore, by arranging the cooling liquid shunt pipes 3 between the two rows of core modules positioned in the center of the at least two rows of core modules, the cooling liquid flows from the middle position to the two sides, the temperature consistency of the cores 6 on the two sides is ensured, and meanwhile, the space is also saved.

With continued reference to fig. 2, when the submerged cooling energy storage battery pack includes a set of coolant flow tube groups and more than two rows of cell modules, the coolant shunt tubes 3 of the set of coolant flow tube groups are disposed between any two rows of cell modules, and a sixth flow channel 16 is disposed between the remaining adjacent two rows of cell modules, specifically, the gaps between the remaining adjacent two rows of cell modules form the sixth flow channel 16, and the number of the fourth flow channels 16 depends on the number of the remaining adjacent cell modules.

The cooling liquid flows out from the through holes 31 of the cooling liquid diversion pipe 3 and then enters the corresponding first flow channels 7, then enters the corresponding sixth flow channels 16 to flow to two sides, then enters the corresponding first flow channels 7 which are closer to the two sides, and finally is converged into the cooling liquid return pipe 1 through the second flow channels 8.

In order to increase the merging speed, an opening may be provided at a position of the coolant return pipe 1 corresponding to the sixth flow passage 16, so that the coolant in the sixth flow passage 16 is facilitated to enter the coolant return pipe 1, and the speed at which the coolant merges into the coolant return pipe 1 is increased.

In the embodiment of the present invention, the number of the cells 6 included in each row of the cell modules is not limited, for example, each row of the cell modules may include 11-13 cells 6.

Illustratively, the at least two rows of cell modules are 4 rows of cell modules, each row of cell modules comprising 12 cells 6.

In summary, the invention adopts the immersed structure to directly cool the battery cell 6, and flow passages are respectively arranged between the battery cell 6 and the battery cell 6, between the battery cell 6 and the upper cover, and between the battery cell 6 and the shell 2, so that six surfaces of the battery cell 6 are contacted with insulating cooling liquid, the heat exchange area of the battery cell 6 is increased, and the temperature distribution of the battery cell 6 is more uniform.

The invention patent with publication number of CN116613425A and the name of 'an immersed liquid-cooled energy storage battery pack', which is also a solution proposed by the inventor of the application aiming at the problems existing in the prior art, at least the following differences exist between the invention patent with the publication number of 'an immersed liquid-cooled energy storage battery pack':

the coolant flow distribution plate is used in the immersed liquid cooling energy storage battery pack, and the coolant flow distribution pipe 3 is used in the application, so that the cost is lower and the installation is more convenient.

2. In the immersed liquid cooling energy storage battery pack ", a T-shaped tube group is formed by a cooling liquid return tube and an outlet tube, and the cooling liquid return tube is arranged at the rear wall of the shell.

There is no bottom support bar in "an immersion liquid cooling energy storage battery package", this application has set up bottom support bar 12 for the coolant liquid can flow between the bottom of electric core module and the bottom 24 of casing 2, thereby in time cool off the bottom of electric core module.

The heat insulation pad with the flow channel in the middle and divided into two parts and with the diamond structure is adopted in the immersed liquid cooling energy storage battery pack, the long-strip heat insulation pad is adopted in the application, the processing is simple, the cost is reduced, and when the upper, middle and lower three long-strip heat insulation pads are used, the upper, middle and lower three parts of the battery cell can be supported, so that local stress is avoided, and the flow channel is prevented from being extruded.

In summary, the immersion cooling energy storage battery pack provided by the application is better than an immersion liquid cooling energy storage battery pack.

Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.

Those of ordinary skill in the art will appreciate that: the modules in the apparatus of the embodiments may be distributed in the apparatus of the embodiments according to the description of the embodiments, or may be located in one or more apparatuses different from the present embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An immersed cooling energy storage battery pack, comprising: the device comprises at least two rows of cell modules, a cooling liquid return pipe, a shell and at least one group of cooling liquid flow pipe groups, wherein each group of cooling liquid flow pipe groups comprises a cooling liquid split pipe, an inlet pipe and an outlet pipe;

2. The submerged cooling energy storage battery pack of claim 1, further comprising a plurality of heat insulating mats;

3. The submerged cooling energy storage battery pack of claim 2, wherein three elongated heat insulation pads are fixedly arranged between two adjacent cells in each cell module at equal intervals from top to bottom.

4. The submerged cooling energy storage battery pack of claim 1, further comprising a plurality of support bars;

5. The submerged cooling energy storage battery pack of claim 1, wherein the coolant shunt tubes of each set of coolant flow tube sets are circular tubes and the spacing between the plurality of through holes is equal.

6. The submerged cooling energy storage battery pack of claim 1, wherein the length of the coolant return line is greater than a preset length threshold.

7. The submerged cooling energy storage battery pack of claim 1, further comprising an upper cover fixedly connected to the housing, a third flow channel being provided between the upper cover and the at least two rows of cell modules.

8. The submerged cooling energy storage battery pack of claim 1, wherein each row of battery modules comprises two module end plates and a plurality of battery cells, the plurality of battery cells are arranged in a row, the two module end plates are respectively positioned at the head and tail positions of the battery cells in the row, and the bottoms of the two module end plates are fixedly connected to the bottom wall of the shell.

9. The submerged cooling energy storage battery pack of claim 1, wherein the submerged cooling energy storage battery pack comprises a set of coolant flow tube sets with coolant shunt tubes disposed between two centrally located rows of cell modules of the at least two rows of cell modules.

10. The submerged cooling energy storage battery pack of claim 1, wherein the at least two rows of cell modules are 4 rows of cell modules, each row of cell modules comprising 12 cells.