Large energy storage battery cell and energy storage system

Abstract

The utility model relates to the technical field of batteries, and provides an energy storage large battery cell and an energy storage system.The energy storage large battery cell comprises a shell, a plurality of bare battery cells, a positive electrode connecting piece, a negative electrode connecting piece and a liquid cooling assembly, the bare battery cells are arranged in the shell and provided with positive electrode lugs and negative electrode lugs, and the number of the bare battery cells is multiple; the positive pole lug of each naked battery cell is electrically connected with the positive pole connecting piece; the negative electrode lug of each naked battery cell is electrically connected with the negative electrode connecting piece; the liquid cooling assembly is arranged in the shell and is suitable for performing heat exchange with each naked battery cell. According to the arrangement, the plurality of naked battery cells are connected in parallel and integrated in the shell to form the large-capacity energy storage battery cell, so that the number of the energy storage battery cells required for assembling the large-capacity energy storage system is reduced, the assembling steps are simplified, the positions needing voltage detection are reduced, the number of voltage acquisition elements needing to be arranged is reduced, and the cost of the energy storage system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a large energy storage battery cell and an energy storage system. Background Art

[0002] Energy storage system is a device used to store electrical energy, mainly used in short-term, intermittent occasions, such as household energy storage, grid peak load regulation, etc. Energy storage system is generally composed of multiple battery clusters connected in parallel, and equipped with a battery management system for monitoring and control to achieve storage and release of electrical energy.

[0003] The battery cluster in the prior art is formed by connecting several energy storage cells in series. As the smallest component unit, the energy storage cell has a small capacity. A large number of energy storage cells are required for a large-capacity energy storage system, and the connection steps during assembly are complicated. Moreover, the voltages of the energy storage cells in each battery cluster are different. The battery management system needs to collect the voltages of each energy storage cell, and many voltage collection components need to be set up, so the cost of the energy storage system is relatively high.

[0004] Therefore, how to solve the problems of complex assembly steps and high cost in the large-capacity energy storage system in the prior art has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] The utility model provides a large energy storage cell and an energy storage system, which are used to solve the defects of complex assembly steps and high cost in the large-capacity energy storage system in the prior art.

[0006] The utility model provides a large energy storage battery cell, comprising:

[0007] shell;

[0008] A bare cell is disposed inside the housing, the bare cell having a positive electrode ear and a negative electrode ear, and a plurality of the bare cells are provided;

[0009] A positive electrode connector, to which the positive electrode lugs of each of the bare cells are electrically connected;

[0010] A negative electrode connector, to which the negative electrode lugs of each of the bare cells are electrically connected;

[0011] A liquid cooling component is arranged inside the shell, and the liquid cooling component is suitable for heat exchange with each of the bare cells.

[0012] According to a large energy storage battery cell provided by the utility model, a plurality of the bare battery cells are arranged in groups, the bare battery cells in each group are distributed along the width direction of the shell, and the bare battery cells in each group are distributed along the length direction of the shell.

[0013] According to a large energy storage battery cell provided by the utility model, the positive pole ears of each group of bare battery cells are located on the same straight line, and the negative pole ears of each group of bare battery cells are located on the same straight line.

[0014] According to a large energy storage battery cell provided by the utility model, the positive electrode ear and the negative electrode ear are located at the same end of the bare battery cell;

[0015] Along the width direction of the shell, there is a distance between the positive electrode ear and the negative electrode ear of the bare battery cell.

[0016] According to a large energy storage battery cell provided by the utility model, the positive electrode connector includes:

[0017] A first connection portion is disposed inside the housing and is electrically connected to a positive electrode column on the housing;

[0018] There are at least two second connecting parts, one second connecting part is correspondingly provided for each group of bare cells, the second connecting parts extend along the length direction of the shell, the second connecting parts are suitable for overlapping the positive pole ears of each group of bare cells, the second connecting parts are spaced apart along the width direction of the shell, and each second connecting part is electrically connected to the first connecting part.

[0019] According to a large energy storage battery cell provided by the utility model, the negative electrode connector includes:

[0020] A third connection portion is disposed inside the housing and is electrically connected to the negative electrode post on the housing;

[0021] There are at least two fourth connecting parts, one fourth connecting part is correspondingly provided for each group of bare cells, the fourth connecting part extends along the length direction of the shell, the fourth connecting part is suitable for overlapping the negative electrode ear of each group of bare cells, and each of the fourth connecting parts is spaced apart along the width direction of the shell, and each of the fourth connecting parts is electrically connected to the third connecting part.

[0022] According to a large energy storage cell provided by the utility model, the liquid cooling assembly includes:

[0023] A water inlet pipe joint and a water outlet pipe joint are arranged on the housing;

[0024] A liquid cooling plate is suitable for being in contact with the side of the bare battery cell, and the two ends of the liquid cooling plate along its length direction are respectively connected to the water inlet pipe joint and the water outlet pipe joint. The liquid cooling plate includes at least two first cooling sections and a second cooling section arranged between two adjacent first cooling sections, the second cooling section is connected to the first cooling section, the first cooling sections are parallel to each other, and a group of the bare battery cells is arranged between two adjacent first cooling sections.

[0025] According to a large energy storage battery cell provided by the utility model, the height direction of the liquid cooling plate is consistent with the height direction of the bare battery cell, the length direction of the first cooling section is consistent with the length direction of the bare battery cell, and the length direction of the second cooling section is consistent with the width direction of the bare battery cell.

[0026] According to a large energy storage battery cell provided by the utility model, the material of the liquid cooling plate is a flexible material.

[0027] The utility model also provides an energy storage system, comprising the above-mentioned large energy storage battery cell.

[0028] The utility model provides a large energy storage battery cell, including a shell, a bare battery cell, a positive electrode connector, a negative electrode connector and a liquid cooling assembly. The shell has a receiving cavity inside, and the positive electrode connector, the negative electrode connector, the bare battery cell and the liquid cooling assembly are all arranged inside the shell. The liquid cooling assembly is used to perform heat exchange with each bare battery cell to promote the heat dissipation of the bare battery cell and reduce the temperature of the bare battery cell. The bare battery cell has a positive electrode ear and a negative electrode ear. There are multiple bare batteries, and the positive electrode ear of each bare battery cell is electrically connected to the positive electrode connector, and the negative electrode ear of each bare battery cell is electrically connected to the negative electrode connector. In this way, multiple bare cells are connected in parallel and integrated inside the shell to form a large-capacity energy storage cell with a high volume energy density. The increase in the capacity of the large energy storage cell can reduce the number of energy storage cells required for assembling a large-capacity energy storage system, simplifying the assembly steps, reducing the number of locations where voltage needs to be detected, reducing the number of voltage collection elements that need to be set up, and reducing the cost of the energy storage system, thereby solving the problem of complex assembly steps and high cost of large-capacity energy storage systems in the prior art.

[0029] Furthermore, in the energy storage system provided by the present invention, since it has the large energy storage cell as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the external structure of the large energy storage battery provided by the utility model;

[0032] Figure 2 This is an exploded view of the large energy storage battery provided by the utility model;

[0033] Figure 3 It is a structural schematic diagram of the positive electrode connector provided by the utility model;

[0034] Figure 4 It is a structural schematic diagram of the negative electrode connector provided by the utility model;

[0035] Figure 5 It is a structural schematic diagram of the positive electrode connector and the negative electrode connector provided by the utility model when they are overlapped on the large energy storage battery cell;

[0036] Figure 6 It is a structural schematic diagram of the liquid cooling plate provided by the utility model.

[0037] Reference numerals:

[0038] 1. Positive pole; 2. Negative pole; 3. Bare battery cell; 4. Positive ear; 5. Negative ear; 6. Positive connector; 7. Negative connector; 8. First connector; 9. Second connector; 10. Third connector; 11. Fourth connector; 12. Water inlet pipe joint; 13. Water outlet pipe joint; 14. Liquid cooling plate; 15. First cooling section; 16. Second cooling section; 17. Shell; 18. Cover plate; 19. Explosion-proof valve; 20. Resin adhesive layer. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] Combine the following Figures 1 to 6 The utility model is described as a large energy storage battery cell.

[0041] like Figures 1 to 6 As shown, the large energy storage battery cell provided by the embodiment of the utility model includes a housing, a bare battery cell 3, a positive electrode connector 6, a negative electrode connector 7 and a liquid cooling assembly.

[0042] Specifically, the interior of the shell has a accommodating cavity, and the positive electrode connector 6, the negative electrode connector 7, the bare battery cell 3 and the liquid cooling component are all arranged inside the shell. The liquid cooling component is used to perform heat exchange with each bare battery cell 3 to promote heat dissipation of the bare battery cell 3 and reduce the temperature of the bare battery cell 3.

[0043] A positive electrode column 1 and a negative electrode column 2 are arranged on the outer shell, a positive electrode connector 6 is electrically connected to the positive electrode column 1 , and a negative electrode connector 7 is electrically connected to the negative electrode column 2 .

[0044] The bare cell 3 is wound or stacked by a positive electrode sheet, a negative electrode sheet and a separator, and the bare cell 3 has a positive electrode ear 4 and a negative electrode ear 5. There are multiple bare cells 3, and the positive electrode ear 4 of each bare cell 3 is electrically connected to the positive electrode connector 6, and the negative electrode ear 5 of each bare cell 3 is electrically connected to the negative electrode connector 7.

[0045] In this way, multiple bare battery cells 3 are connected in parallel and integrated inside the shell to form a large-capacity energy storage battery cell with a higher volume energy density. The increase in the capacity of the large energy storage battery cell can reduce the number of energy storage batteries required for assembling a large-capacity energy storage system, thereby simplifying the assembly steps. Moreover, the bare battery cells 3 are connected in parallel and have consistent voltages, which reduces the number of locations where voltage detection is required and the number of voltage collection elements that need to be set up, thereby reducing the cost of the energy storage system. This solves the problem of complex assembly steps and high costs in large-capacity energy storage systems in the prior art.

[0046] It should be noted that the bare battery cell 3 in the embodiment of the present invention does not have a shell itself, and each winding structure or stacking structure formed by the positive electrode sheet, the negative electrode sheet and the separator is directly placed inside the shell of the large energy storage battery cell.

[0047] The shell is in the shape of a cube, and the length direction of the shell is Figure 1 The direction indicated by x is the width direction of the shell. Figure 1 The direction indicated by y in the figure is the height direction of the shell. Figure 1 The direction indicated by z.

[0048] The housing includes a shell 17 and a cover plate 18, and the shell 17 and the cover plate 18 are detachably connected together by bolts.

[0049] An explosion-proof valve 19 is also provided on the housing 17 to protect the large energy storage cells and prevent accidents such as overheating, short circuit and explosion of the large energy storage cells.

[0050] The shell may be made of resin.

[0051] The number of bare cells 3 is set according to the requirements, refer to Figure 2 , 15 bare battery cells 3 are provided, which are divided into three groups. The three groups of bare battery cells 3 are distributed along the width direction of the shell, each group contains five bare battery cells 3, and the five bare battery cells 3 in each group are distributed along the length direction of the shell.

[0052] In this embodiment, multiple bare cells 3 are arranged in groups, so that each group of bare cells 3 is distributed along the width direction of the shell, and each bare cell 3 in each group is distributed along the length direction of the shell. The positive tabs 4 of each group of bare cells 3 are located on the same straight line, and the negative tabs 5 of each group of bare cells 3 are located on the same straight line.

[0053] At this time, the positive electrode connector 6 and the negative electrode connector 7 can be set to be a long strip structure, and the positive electrode ear 4 or the negative electrode ear 5 of each group of bare battery cells 3 corresponds to one long strip structure, which is beneficial to reduce the length of the long strip structure, reduce the usage of the positive electrode connector 6 and the negative electrode connector 7, and reduce the weight and cost of the large energy storage battery cell.

[0054] In this embodiment, the positive electrode ear 4 and the negative electrode ear 5 are located at the same end of the bare battery cell 3. At this time, the positive electrode ear 4 and the negative electrode ear 5 of the bare battery cell 3 need to have a spacing along the width direction of the shell, so as to avoid the positional interference problem between the positive electrode connector 6 and the negative electrode connector 7, and each long strip structure can be arranged in parallel.

[0055] In a specific embodiment, the positive electrode connector 6 includes a first connecting portion 8 and a second connecting portion 9 . The first connecting portion 8 is disposed inside the housing, and the first connecting portion 8 is electrically connected to the positive electrode column 1 .

[0056] At least two second connection parts 9 are provided, and one second connection part 9 is provided for each group of bare cells 3. The second connection parts 9 extend along the length direction of the shell, and the second connection parts 9 overlap the positive pole ears 4 of each group of bare cells 3. The second connection parts 9 are spaced apart along the width direction of the shell, and the second connection parts 9 are electrically connected to the first connection parts 8, so that the positive pole ears 4 of each group of bare cells 3 are simultaneously connected to the positive pole column 1 through the first connection parts 8.

[0057] Correspondingly, the negative electrode connector 7 includes a third connecting portion 10 and a fourth connecting portion 11 . The third connecting portion 10 is disposed inside the housing and is electrically connected to the negative electrode column 2 .

[0058] At least two fourth connection parts 11 are provided, and one fourth connection part 11 is provided for each group of bare cells 3. The fourth connection part 11 extends along the length direction of the shell, and the fourth connection part 11 overlaps the negative electrode ear 5 of each group of bare cells 3. The fourth connection parts 11 are spaced apart along the width direction of the shell, and each fourth connection part 11 is electrically connected to the third connection part 10, so that the negative electrode ear 5 of each group of bare cells 3 is simultaneously connected to the negative electrode column 2 through the third connection part 10.

[0059] The second connection parts 9 and the fourth connection parts 11 are both in the shape of long strips, and the second connection parts 9 are parallel to each other, the fourth connection parts 11 are parallel to each other, and the second connection parts 9 and the fourth connection parts 11 are parallel to each other.

[0060] In the embodiment of the utility model, the liquid cooling assembly includes a water inlet pipe joint 12 , a water outlet pipe joint 13 and a liquid cooling plate 14 .

[0061] The water inlet pipe joint 12 and the water outlet pipe joint 13 are arranged on the shell, one end of the water inlet pipe joint 12 extends to the outside of the shell, and the other end extends to the inside of the shell, and one end of the water outlet pipe joint 13 extends to the outside of the shell, and the other end extends to the inside of the shell.

[0062] The liquid cooling plate 14 is arranged inside the housing, and is used to be in contact with the side surface of the bare battery cell 3 . The two ends of the liquid cooling plate 14 along the length direction are respectively connected to the water inlet pipe joint 12 and the water outlet pipe joint 13 .

[0063] The liquid cooling plate 14 includes a first cooling section 15 and a second cooling section 16. There are at least two first cooling sections 15. The second cooling section 16 is disposed between two adjacent first cooling sections 15. The second cooling section 16 is connected to the first cooling section 15 to connect the first cooling sections 15 in series.

[0064] Each first cooling section 15 is parallel to each other, and a group of bare cells 3 is disposed between two adjacent first cooling sections 15. Two opposite sides of each group of bare cells 3 are in contact with a first cooling section 15 respectively, which can ensure the cooling effect of the bare cells 3.

[0065] The number of first cooling sections 15 is determined according to the number of groups of bare battery cells 3 , ensuring that each group of bare battery cells 3 corresponds to two groups of first cooling sections 15 , wherein two adjacent groups of bare battery cells 3 share a first cooling section 15 located between the two groups of bare battery cells 3 .

[0066] In the embodiment of the utility model, the height direction of the bare battery cell 3 is consistent with the height direction of the shell, so that the height direction of the liquid cooling plate 14 is consistent with the height direction of the bare battery cell 3, the length direction of the first cooling section 15 is consistent with the length direction of the bare battery cell 3, and the length direction of the second cooling section 16 is consistent with the width direction of the bare battery cell 3.

[0067] The bare battery cell 3 is in a cubic shape, and the dimension of the bare battery cell 3 in the length direction is larger than the dimension of the bare battery cell 3 in the width direction. That is to say, the side with the largest area of ​​each bare battery cell 3 is in contact with the liquid cooling plate 14. The contact area between the bare battery cell 3 and the liquid cooling plate 14 is large, which is beneficial to improving the heat exchange efficiency between the bare battery cell 3 and the liquid cooling plate 14.

[0068] In the embodiment of the utility model, the liquid cooling plate 14 is made of a flexible material, which can ensure that the liquid cooling plate 14 and each bare battery cell 3 are in close contact and in good contact state, thereby ensuring the heat exchange efficiency between each bare battery cell 3 and the liquid cooling plate 14 .

[0069] Specifically, the flexible material may be, but is not limited to, an aluminum-plastic film.

[0070] In this embodiment, after placing each bare battery cell 3 and the liquid cooling plate 14 inside the shell 17 and adjusting the position of each bare battery cell 3 and the liquid cooling plate 14, a resin glue layer 20 is poured into the shell 17 and the external space of the overall module composed of the liquid cooling plate 14 and each bare battery cell 3 to fill the gap and improve the position stability of the bare battery cell 3 and the liquid cooling plate 14.

[0071] After the resin adhesive layer 20 is cured, electrolyte is added between the liquid cooling plate 14 and the bare battery cells 3 , between adjacent bare battery cells 3 , and inside the bare battery cells 3 .

[0072] In summary, the energy storage cell provided by the embodiment of the utility model does not need to be assembled into a module separately, is easy to assemble, and reduces the number of voltage collection components, thereby improving the reliability of system operation and the utilization rate of the energy storage system and saving costs. Moreover, the liquid cooling component is integrated inside the energy storage cell, which greatly improves the liquid cooling effect.

[0073] On the other hand, an embodiment of the utility model further provides an energy storage system, including the large energy storage cell provided in any of the above embodiments. The large energy storage cell provided in any of the above embodiments has a large capacity, which is conducive to reducing the assembly steps of the energy storage system and reducing the number of voltage collection components. Therefore, the assembly steps of the energy storage system in this embodiment are simple and the cost is low. The derivation process of the beneficial effects of the energy storage system in the embodiment of the utility model is generally similar to the derivation process of the beneficial effects of the above-mentioned large energy storage cell, so it will not be repeated here.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A large energy storage cell, characterized in that: include: shell; A bare cell is disposed inside the housing, the bare cell having a positive electrode ear and a negative electrode ear, and a plurality of the bare cells are provided; A positive electrode connector, to which the positive electrode lugs of each of the bare cells are electrically connected; A negative electrode connector, to which the negative electrode lugs of each of the bare cells are electrically connected; A liquid cooling component is arranged inside the shell, and the liquid cooling component is suitable for heat exchange with each of the bare cells.

2. The large energy storage cell according to claim 1, characterized in that: The plurality of bare cells are arranged in groups, the bare cells in each group are distributed along the width direction of the outer shell, and the bare cells in each group are distributed along the length direction of the outer shell.

3. The large energy storage cell according to claim 2, characterized in that: The positive pole ears of each group of bare cells are located on the same straight line, and the negative pole ears of each group of bare cells are located on the same straight line.

4. The large energy storage cell according to claim 3, characterized in that: The positive electrode tab and the negative electrode tab are located at the same end of the bare battery cell; Along the width direction of the shell, there is a distance between the positive electrode ear and the negative electrode ear of the bare battery cell.

5. The large energy storage cell according to claim 2, characterized in that: The positive electrode connector comprises: A first connection portion is disposed inside the housing and is electrically connected to a positive electrode column on the housing; There are at least two second connecting parts, one second connecting part is correspondingly provided for each group of bare cells, the second connecting parts extend along the length direction of the shell, the second connecting parts are suitable for overlapping the positive pole ears of each group of bare cells, the second connecting parts are spaced apart along the width direction of the shell, and each second connecting part is electrically connected to the first connecting part.

6. The large energy storage cell according to claim 2, characterized in that: The negative electrode connector comprises: A third connection portion is disposed inside the housing and is electrically connected to the negative electrode post on the housing; There are at least two fourth connecting parts, one fourth connecting part is correspondingly provided for each group of bare cells, the fourth connecting part extends along the length direction of the shell, the fourth connecting part is suitable for overlapping the negative electrode ear of each group of bare cells, and each of the fourth connecting parts is spaced apart along the width direction of the shell, and each of the fourth connecting parts is electrically connected to the third connecting part.

7. The large energy storage cell according to claim 1, characterized in that: The liquid cooling assembly comprises: A water inlet pipe joint and a water outlet pipe joint are arranged on the housing; A liquid cooling plate is suitable for being in contact with the side of the bare battery cell, and the two ends of the liquid cooling plate along its length direction are respectively connected to the water inlet pipe joint and the water outlet pipe joint. The liquid cooling plate includes at least two first cooling sections and a second cooling section arranged between two adjacent first cooling sections, the second cooling section is connected to the first cooling section, the first cooling sections are parallel to each other, and a group of the bare battery cells is arranged between two adjacent first cooling sections.

8. The large energy storage cell according to claim 7, characterized in that: The height direction of the liquid cooling plate is consistent with the height direction of the bare battery cell, the length direction of the first cooling section is consistent with the length direction of the bare battery cell, and the length direction of the second cooling section is consistent with the width direction of the bare battery cell.

9. The large energy storage cell according to claim 7, characterized in that: The liquid cooling plate is made of flexible material.

10. An energy storage system, characterized in that: It comprises the large energy storage cell as claimed in any one of claims 1 to 9.

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