Liquid cooling assembly, energy storage large battery cell and energy storage system

Abstract

The utility model relates to the technical field of batteries, and provides a liquid cooling assembly, an energy storage large battery cell and an energy storage system.The liquid cooling assembly comprises a liquid cooling plate and a cooling column, the liquid cooling plate is suitable for being in contact with the end face of a bare battery cell, and the liquid cooling plate is internally provided with a first liquid cooling channel for cooling liquid to flow; the cooling column is arranged on the liquid cooling plate, one end of the cooling column is connected with the liquid cooling plate, and the other end of the cooling column is suitable for extending into the naked battery cell, so that the cooling column exchanges heat with the naked battery cell. According to the arrangement, heat exchange is performed between the liquid cooling plate and the end face of the winding type naked battery cell, and heat exchange is performed between the cooling column and the interior of the winding type naked battery cell, so that the winding type naked battery cell can be fully cooled, and uniform temperature distribution of the winding type naked battery cell is ensured; the problem that in the prior art, temperature distribution of a winding structure is not uniform is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a liquid cooling component, 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] Some energy storage systems use wound batteries. For wound batteries, the heat inside the winding structure, that is, the heat located in the center of the winding structure, has a long heat dissipation path and is not easy to dissipate to the outside, resulting in excessively high temperatures inside the winding structure and uneven temperatures of the winding structure, which affects service life and safety.

[0004] Therefore, how to solve the problem of uneven temperature distribution of the winding structure 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 liquid cooling component, a large energy storage battery cell and an energy storage system, which are used to solve the defect of uneven temperature distribution of a winding structure in the prior art.

[0006] The utility model provides a liquid cooling component, comprising:

[0007] A liquid cooling plate, adapted to contact the end surface of the bare battery cell, wherein the liquid cooling plate has a first liquid cooling channel for circulating cooling liquid;

[0008] A cooling column is arranged on the liquid cooling plate, one end of the cooling column is connected to the liquid cooling plate, and the other end is suitable for extending into the interior of the bare battery cell so that the cooling column and the bare battery cell can exchange heat.

[0009] According to a liquid cooling component provided by the utility model, a second liquid cooling channel is arranged inside the cooling column, the second liquid cooling channel extends from one end of the cooling column to the other end, and the second liquid cooling channel is connected to the first liquid cooling channel.

[0010] According to a liquid cooling component provided by the utility model, a plurality of cooling columns are provided, and the cooling columns are suitable for being coaxially arranged with the bare battery core, and the plurality of cooling columns are distributed at intervals along the extension direction of the first liquid cooling channel.

[0011] According to a liquid cooling component provided by the utility model, a liquid inlet hole and a liquid outlet hole are arranged at one end of the liquid cooling plate, the first liquid cooling channel is U-shaped, and the two ends of the first liquid cooling channel are respectively connected to the liquid inlet hole and the liquid outlet hole.

[0012] According to a liquid cooling component provided by the utility model, guide ribs are arranged in the first liquid cooling channel, and the extension direction of the guide ribs is consistent with the extension direction of the first liquid cooling channel.

[0013] According to a liquid cooling component provided by the utility model, the cooling column is cylindrical.

[0014] According to a liquid cooling component provided by the utility model, the liquid cooling plate includes a first plate member and a second plate member, and the first plate member and the second plate member have a groove on one side facing each other, the first plate member and the second plate member are buckled and sealed together, and the groove forms the first liquid cooling channel.

[0015] The utility model also provides a large energy storage battery cell, comprising a shell, a bare battery cell and the above-mentioned liquid cooling component, wherein the bare battery cell and the liquid cooling component are arranged inside the shell, and the liquid cooling component is suitable for heat exchange with the bare battery cell.

[0016] According to a large energy storage battery cell provided by the utility model, a plurality of bare batteries are provided, and the liquid cooling assembly includes a plurality of cooling columns, each bare battery cell corresponds to a cooling column, and the cooling column is located inside the bare battery cell.

[0017] The utility model also provides an energy storage system, including the above-mentioned liquid cooling component, or including the above-mentioned large energy storage battery cell.

[0018] The liquid cooling assembly provided by the utility model includes a liquid cooling plate and a cooling column. The liquid cooling plate can support the bare battery cell, and is used to contact the end face of the bare battery cell, and is used to perform heat exchange with the end face of the bare battery cell. The interior of the liquid cooling plate is provided with a first liquid cooling channel, and the first liquid cooling channel is used for the circulation of cooling liquid. The circulation of cooling liquid is conducive to improving the heat exchange efficiency between the liquid cooling plate and the end face of the bare battery cell. The cooling column is arranged on the liquid cooling plate, and one end of the cooling column is connected to the liquid cooling plate, and the other end is used to extend into the interior of the bare battery cell to perform heat exchange with the interior of the bare battery cell. With such an arrangement, while the liquid cooling plate is used to perform heat exchange with the end face of the wound bare battery cell, the cooling column is used to perform heat exchange with the interior of the wound bare battery cell, so that the wound bare battery cell can be fully cooled down, ensuring that the temperature distribution of the wound bare battery cell is uniform, and solving the problem of uneven temperature distribution of the winding structure in the prior art.

[0019] Furthermore, in the large energy storage battery cell provided by the present invention, since it is provided with the liquid cooling assembly as described above, it also has the various advantages as described above.

[0020] Furthermore, in the energy storage system provided by the present invention, since it is provided with the liquid cooling assembly or the large energy storage cell as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the structure of a large energy storage cell provided by some embodiments of the utility model;

[0023] Figure 2 It is an exploded view of a large energy storage cell provided by some embodiments of the utility model;

[0024] Figure 3 It is a schematic diagram of the structure of the liquid cooling assembly provided in some embodiments of the present utility model.

[0025] Reference numerals:

[0026] 1. Liquid cooling plate; 2. Bare battery cell; 3. First liquid cooling channel; 4. Cooling column; 5. Explosion-proof valve; 6. Guide rib; 7. Shell; 8. Cover plate; 9. First plate; 10. Second plate; 11. Positive pole; 12. Negative pole; 13. Liquid inlet pipe; 14. Liquid outlet pipe; 15. Resin adhesive layer. DETAILED DESCRIPTION

[0027] 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.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0030] Combine the following Figures 1 to 3 The liquid cooling assembly of the present invention is described.

[0031] like Figures 1 to 3 As shown, the liquid cooling assembly provided by the embodiment of the utility model includes a liquid cooling plate 1 and a cooling column 4.

[0032] Specifically, the liquid cooling plate 1 can support the bare battery cell 2, and the liquid cooling plate 1 is used to contact the end surface of the bare battery cell 2 and to perform heat exchange with the end surface of the bare battery cell 2. The bare battery cell 2 is wound by a positive electrode sheet, a negative electrode sheet and a diaphragm.

[0033] The liquid cooling plate 1 has a first liquid cooling channel 3 inside, and the first liquid cooling channel 3 is for cooling liquid to circulate. The circulation of cooling liquid is beneficial to improving the heat exchange efficiency between the end surface of the liquid cooling plate 1 and the bare battery cell 2.

[0034] The cooling column 4 is disposed on the liquid cooling plate 1 , one end of the cooling column 4 is connected to the liquid cooling plate 1 , and the other end is used to extend into the interior of the bare battery cell 2 to perform heat exchange with the interior of the bare battery cell 2 .

[0035] With such an arrangement, while the liquid cooling plate 1 is used to perform heat exchange with the end surface of the wound bare battery cell 2, the cooling column 4 is used to perform heat exchange with the interior of the wound bare battery cell 2, so that the wound bare battery cell 2 can be fully cooled, ensuring that the temperature distribution of the wound bare battery cell 2 is uniform, improving the cooling effect of the liquid cooling component, and solving the problem of uneven temperature distribution of the winding structure in the prior art, which is beneficial to increasing the service life of the large energy storage battery cell and improving the charge and discharge rate.

[0036] The material of the cooling column 4 can be the same as that of the liquid cooling plate 1, and both are thermally conductive materials. The material of the cooling column 4 and the liquid cooling plate 1 can be, but is not limited to, aluminum.

[0037] The liquid cooling plate 1 includes a first plate 9 and a second plate 10. A groove is formed on the side of the first plate 9 and the second plate 10 facing each other. After the first plate 9 and the second plate 10 are buckled together, the first plate 9 and the second plate 10 are fixedly connected together by welding. The groove on the first plate 9 is connected with the groove on the second plate 10 to form a first liquid cooling channel 3.

[0038] In a specific embodiment, when the cooling column 4 extends into the interior of the bare battery cell 2, the central axis of the cooling column 4 coincides with the central axis of the bare battery cell 2. At this time, the axis of the cooling column 4 needs to be perpendicular to the liquid cooling plate 1.

[0039] In order to facilitate the cooling column 4 to smoothly extend into the interior of the wound bare battery cell 2, when processing the bare battery cell 2, it is necessary to reserve a hole at the center position of the bare battery cell 2, and the shape of the cooling column 4 needs to be consistent with the shape of the reserved hole.

[0040] The shape of the cooling column 4 can be, but is not limited to, a cylindrical shape.

[0041] In the embodiment of the utility model, a second liquid cooling channel is provided inside the cooling column 4, and the second liquid cooling channel extends from one end of the cooling column 4 to the other end, and the second liquid cooling channel is connected to the first liquid cooling channel 3. The coolant in the first liquid cooling channel 3 can enter the second liquid cooling channel, and the coolant can take away heat during the circulation process, thereby improving the heat exchange efficiency between the cooling column 4 and the bare battery cell 2.

[0042] In this embodiment, a plurality of cooling columns 4 are provided, each cooling column 4 corresponds to each bare battery cell 2 one by one, and the corresponding cooling columns 4 and bare battery cells 2 are coaxially arranged, and each cooling column 4 is connected to the liquid cooling plate 1 .

[0043] A plurality of bare battery cells 2 may be placed on the liquid cooling plate 1 , and each bare battery cell 2 corresponds to a cooling column 4 , so that the liquid cooling assembly in this embodiment can cool the end surfaces and interior of the plurality of bare battery cells 2 at the same time.

[0044] When a second liquid cooling channel is provided in the cooling column 4, each second liquid cooling channel is connected to the first liquid cooling channel 3, and multiple cooling columns 4 are distributed at intervals along the extension direction of the first liquid cooling channel 3, so that the coolant in the first liquid cooling channel 3 of the liquid cooling plate 1 can flow to each second liquid cooling channel respectively.

[0045] In the embodiment of the utility model, a liquid inlet hole and a liquid outlet hole are provided at one end of the liquid cooling plate 1, the first liquid cooling channel 3 is U-shaped, and the two ends of the first liquid cooling channel 3 are respectively connected to the liquid inlet hole and the liquid outlet hole. The coolant enters the first liquid cooling channel 3 through the liquid inlet hole, and the coolant in the first liquid cooling channel 3 can flow out from the liquid outlet hole.

[0046] The liquid cooling plate 1 is provided with a liquid inlet pipe 13 and a liquid outlet pipe 14 on the outside. The liquid inlet pipe 13 is connected to the liquid inlet hole, and the liquid outlet pipe 14 is connected to the liquid outlet hole. The liquid inlet pipe 13 and the liquid outlet pipe 14 are used to connect the liquid supply pipeline.

[0047] In the embodiment of the utility model, a guide rib 6 is provided in the first liquid cooling channel 3, and the extension direction of the guide rib 6 is consistent with the extension direction of the first liquid cooling channel 3. The setting of the guide rib 6 can guide the circulation of the coolant in the liquid cooling plate 1, thereby ensuring the orderly circulation of the coolant and ensuring the heat exchange efficiency.

[0048] On the other hand, an embodiment of the utility model further provides a large energy storage cell, comprising a housing, a bare cell 2 and a liquid cooling assembly provided in any of the above embodiments, wherein the bare cell 2 and the liquid cooling assembly are arranged inside the housing, and the liquid cooling assembly is used to perform heat exchange on the bare cell 2. The liquid cooling assembly provided in any of the above embodiments can fully cool the wound bare cell 2 to ensure uniform temperature distribution of the wound bare cell 2. Therefore, the large energy storage cell in this embodiment has the advantages of uniform internal temperature distribution, long service life, high safety factor and high charge and discharge rate. The derivation process of the beneficial effects of the large energy storage cell in the embodiment of the utility model is generally similar to the derivation process of the beneficial effects of the above-mentioned liquid cooling assembly, so it will not be repeated here.

[0049] In the embodiment of the utility model, a plurality of bare cells 2 are provided, each of which is located on the liquid cooling plate 1, and the end surface of each bare cell 2 is in contact with the liquid cooling plate 1. The liquid cooling assembly includes a plurality of cooling columns 4, one cooling column 4 corresponding to each bare cell 2, and the cooling column 4 is located inside the bare cell 2.

[0050] A positive pole 11 and a negative pole 12 are arranged on the outer shell, and the positive pole ears of each bare cell 2 are electrically connected to the positive pole 11 on the outer shell, and the negative pole ears of each bare cell 2 are electrically connected to the negative pole 12 on the outer shell. Multiple bare cells 2 are connected in parallel and integrated inside the outer shell to form a large-capacity energy storage cell with a high volume energy density. The increase in the capacity of the energy storage cell can reduce the number of energy storage cells required for assembling a large-capacity energy storage system, simplifying the assembly steps, and the bare cells 2 are connected in parallel, the voltage is consistent, the number of locations where the voltage needs to be detected is reduced, the number of voltage collection components that need to be set is reduced, and the cost of the energy storage system is reduced.

[0051] It should be noted that the bare battery cell 2 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.

[0052] 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.

[0053] The housing comprises a shell 7 and a cover plate 8, and the shell 7 and the cover plate 8 are detachably connected together by bolts.

[0054] An explosion-proof valve 5 is also provided on the housing 7 to protect the large energy storage cells and prevent accidents such as overheating, short circuit and explosion of the large energy storage cells.

[0055] The shell may be made of resin.

[0056] The number of bare cells 2 is set according to the requirements, refer to Figure 2 , 12 bare battery cells 2 are provided, which are divided into two groups. The two groups of bare battery cells 2 are distributed along the width direction of the shell, each group contains six bare battery cells 2, and the six bare battery cells 2 in each group are distributed along the length direction of the shell.

[0057] The number of cooling columns 4 is consistent with the number of bare battery cells 2 and corresponds one to one.

[0058] After placing each bare cell 2 and liquid cooling plate 1 inside the shell 7 and adjusting the position of each bare cell 2 and liquid cooling plate 1, a resin glue layer 15 is poured into the shell 7 to fill the gap and improve the position stability of the bare cell 2 and liquid cooling plate 1.

[0059] After the resin adhesive layer 15 is cured, electrolyte is added between the liquid cooling plate 1 and the bare battery cells 2 , between adjacent bare battery cells 2 , and inside the bare battery cells 2 .

[0060] On the other hand, the embodiment of the utility model further provides an energy storage system, including the liquid cooling assembly or large energy storage cell provided in any of the above embodiments. It has all the advantages of the above liquid cooling assembly or large energy storage cell, which will not be repeated here. 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 liquid cooling assembly or large energy storage cell, so it will not be repeated here.

[0061] 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 liquid cooling component, characterized in that: include: A liquid cooling plate, adapted to contact the end surface of the bare battery cell, wherein the liquid cooling plate has a first liquid cooling channel for circulating cooling liquid; A cooling column is arranged on the liquid cooling plate, one end of the cooling column is connected to the liquid cooling plate, and the other end is suitable for extending into the interior of the bare battery cell so that the cooling column and the bare battery cell can exchange heat.

2. The liquid cooling assembly according to claim 1, characterized in that: A second liquid cooling channel is provided inside the cooling column. The second liquid cooling channel extends from one end of the cooling column to the other end. The second liquid cooling channel is connected to the first liquid cooling channel.

3. The liquid cooling assembly according to claim 1 or 2, characterized in that: A plurality of cooling columns are provided, and the cooling columns are suitable for being coaxially arranged with the bare battery core, and the plurality of cooling columns are distributed at intervals along the extension direction of the first liquid cooling channel.

4. The liquid cooling assembly according to claim 1, characterized in that: A liquid inlet hole and a liquid outlet hole are provided at one end of the liquid cooling plate, the first liquid cooling channel is U-shaped, and two ends of the first liquid cooling channel are respectively connected to the liquid inlet hole and the liquid outlet hole.

5. The liquid cooling assembly according to claim 1, characterized in that: A guide rib is arranged in the first liquid cooling channel, and an extension direction of the guide rib is consistent with an extension direction of the first liquid cooling channel.

6. The liquid cooling assembly according to claim 1, characterized in that: The cooling column is in a cylindrical shape.

7. The liquid cooling assembly according to claim 1, characterized in that: The liquid cooling plate includes a first plate member and a second plate member. The first plate member and the second plate member have a groove on one side facing each other. The first plate member and the second plate member are buckled and sealed together. The groove forms the first liquid cooling channel.

8. A large energy storage cell, characterized in that: It comprises a shell, a bare battery cell and a liquid cooling assembly as claimed in any one of claims 1 to 7, wherein the bare battery cell and the liquid cooling assembly are arranged inside the shell, and the liquid cooling assembly is suitable for heat exchange with the bare battery cell.

9. The large energy storage cell according to claim 8, characterized in that: There are multiple bare battery cells, and the liquid cooling assembly includes multiple cooling columns. Each bare battery cell corresponds to one cooling column, and the cooling column is located inside the bare battery cell.

10. An energy storage system, characterized in that: It comprises the liquid cooling assembly as described in any one of claims 1 to 7, or comprises the large energy storage cell as described in any one of claims 8 to 9.

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