Battery cell shell, battery cell, battery pack, vehicle and assembly method of battery cell

Abstract

The embodiment of the invention provides a battery cell shell, a battery cell, a battery pack, a vehicle and an assembly method of the battery cell. The battery cell shell disclosed by the embodiment of the invention comprises an inner shell and an outer shell, the inner shell is nested in the outer shell, a cooling channel is formed between the inner shell and the outer shell, and at the open end, a height difference exists between the end part of the inner shell and the end part of the outer shell in the height direction of the battery cell. When the inner shell is matched with the end cover, the open end can be sealed through the end cover, and accurate positioning of the end cover is achieved through the height difference between the inner shell and the outer shell. Therefore, the positioning accuracy and the assembly efficiency of the end cover are improved. And the positions of the end covers can be limited only by manufacturing the inner shell and the outer shell and limiting the sizes of the inner shell and the outer shell. Therefore, the structure is relatively simple and convenient, and the processing convenience is high. Therefore, the battery cell shell provided by the embodiment of the invention has the advantages of simple structure, good positioning accuracy and high assembly efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell shell and a battery cell, a battery pack, and a vehicle having the battery cell shell; in addition, it also relates to a battery cell assembly method. Background Art

[0002] As batteries are increasingly used in electric vehicles and grid energy storage, their safety performance is receiving increasing attention. In particular, under high-rate fast charging conditions, the battery cells generate more heat, and the high-temperature cooling problem of the battery cells is difficult to solve, which limits the performance of the battery cells. The use of liquid cooling plates to cool the battery cells has limited effect on the temperature control of the battery cells in the internal area, resulting in the heat of the internal battery cells not being dissipated in time. In related technologies, a cooling channel is directly set on the battery cell shell, and is sealed to the battery cell shell through an end cover. However, when the end cover and the battery cell shell are matched, the deviation in the position of the end cover may often cause poor sealing of the cooling channel and low assembly efficiency. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, an embodiment of the present invention provides a battery cell housing having the advantages of good positioning accuracy and high assembly efficiency.

[0004] An embodiment of the present invention further provides a battery cell.

[0005] An embodiment of the present invention further provides a method for assembling a battery cell.

[0006] An embodiment of the present invention further provides a battery pack.

[0007] An embodiment of the present invention further provides a vehicle.

[0008] The battery cell casing of the embodiment of the present invention has an open end at one end that can cooperate with the end cover.

[0009] The battery cell housing includes an inner shell and an outer shell. The inner shell is nested within the outer shell, and a cooling channel is formed between the inner shell and the outer shell, communicating with the open end. At the open end, there is a height difference between the end of the inner shell and the end of the outer shell in the height direction of the battery cell. It is understood that the cooling channel on the outer shell has a liquid inlet and a liquid outlet.

[0010] The battery cell casing of an embodiment of the present invention forms a cooling channel between the inner and outer shells, communicating with the open end, thereby cooling individual battery cells and preventing localized overheating of the battery cells within the battery pack. Furthermore, a height difference exists between the ends of the inner and outer shells, along the height direction of the battery cells, to provide a position limit. When mated with an end cap, the end cap not only seals the open end, but also precisely positions the end cap due to the height difference between the inner and outer shells. This ensures the sealing of the cooling channel while improving end cap positioning accuracy and assembly efficiency.

[0011] In addition, the battery cell housing of the embodiment of the present invention can achieve positional definition of the end cap only by defining the dimensions of the inner shell and the outer shell during manufacture. Therefore, the battery cell housing also has the advantages of relatively simple structure and high processing convenience.

[0012] Therefore, the battery cell housing according to the embodiment of the present invention has the advantages of good positioning accuracy and high assembly efficiency.

[0013] In some embodiments, the height difference is 0.5 mm to 50 mm.

[0014] In some embodiments, the height of the inner shell is lower than the height of the outer shell.

[0015] In some embodiments, the housing has a first side wall and a second side wall adjacent to each other, the area of ​​the first side wall is greater than or equal to the area of ​​the second side wall, and the liquid inlet or outlet of the cooling channel is provided on the first side wall.

[0016] In some embodiments, the housing has a third side wall, the third side wall is arranged opposite to the first side wall, the liquid inlet of the cooling channel is arranged on the first side wall, and the liquid outlet of the cooling channel is arranged on the third side wall.

[0017] In some embodiments, the outer shell can be detachably mounted on the outer shell.

[0018] In some embodiments, the battery cell housing further includes a support member, which is supported between the bottom wall of the inner shell and the bottom wall of the outer shell, a first channel is formed between the bottom wall of the inner shell and the bottom wall of the outer shell, and a gap is provided between the side wall of the inner shell and the side wall of the outer shell to form a second channel, and the first channel and the second channel are connected to form the cooling channel.

[0019] The battery cell of an embodiment of the present invention includes a winding core, an end cover and a battery cell shell according to any one of the above descriptions, wherein the winding core is arranged in the inner shell, the end cover has a step portion, and the step portion abuts against the end of the inner shell and the end of the outer shell.

[0020] The assembly method of the battery cell of the embodiment of the present invention is based on the battery cell structure described above. After the core is loaded into the inner shell, liquid is injected, the outer wall of the inner shell is clamped, the core is formed and the volume is divided, and then the preform formed by the core and the inner shell is loaded into the outer shell. Finally, the end cover is installed on the open end.

[0021] The battery pack according to the embodiment of the present invention includes the battery cells described above.

[0022] The vehicle according to the embodiment of the present invention includes the battery pack described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 4 is a three-dimensional diagram of a battery cell according to an embodiment of the present invention.

[0024] Figure 2 It is a front view of a battery cell according to an embodiment of the present invention.

[0025] Figure 3 It is a partial cross-sectional view of the top of the battery cell according to an embodiment of the present invention.

[0026] Figure 4 It is a partial cross-sectional view of the bottom end of the battery cell according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] Battery cell housing 10; end cover 20; step portion 201;

[0029] Core 30;

[0030] Inner shell 1;

[0031] Housing 2; first side wall 21; second side wall 22;

[0032] Cooling channel 3; first channel 31; second channel 32; liquid inlet 33; liquid outlet 34;

[0033] Support member 4. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0035] Reference below Figures 1-4 The battery cell housing 10 , battery cells, battery packs, vehicles, and battery cell assembly methods according to embodiments of the present invention are described.

[0036] The battery cell housing 10 of the embodiment of the present invention has an open end (for example, Figure 1 with the open end at the top).

[0037] The cell housing 10 comprises an inner shell 1 and an outer shell 2. The inner shell 1 is nested within the outer shell 2, and a cooling channel 3 is formed between the inner shell 1 and the outer shell 2, communicating with the open end. At the open end, there is a height difference between the end of the inner shell 1 and the end of the outer shell 2 in the height direction of the cell. It is understood that the cooling channel 3 on the outer shell 2 has a liquid inlet 33 and a liquid outlet 34.

[0038] The battery cell casing 10 of the embodiment of the present invention forms a cooling channel 3 between the inner shell 1 and the outer shell 2, communicating with the open end, thereby cooling individual battery cells and preventing localized overheating of the battery cells within the battery pack. Furthermore, a height difference exists between the ends of the inner shell 1 and the outer shell 2 in the height direction of the battery cells to form a limit. When mated with the end cap 20, not only does the end cap 20 seal the open end, but the height difference between the inner shell 1 and the outer shell 2 also allows for precise positioning of the end cap 20. This ensures the sealing of the cooling channel 3 while improving the positioning accuracy and assembly efficiency of the end cap 20.

[0039] In addition, the position of the end cap can be determined by only defining the dimensions of the inner shell 1 and the outer shell 2 during manufacture. Therefore, the battery cell housing also has the advantages of relatively simple structure and high processing convenience.

[0040] Therefore, the battery cell casing 10 according to the embodiment of the present invention has the advantages of good positioning accuracy and high assembly efficiency.

[0041] The height difference between the end of the inner shell 1 and the end of the outer shell 2 at the open end is 0.5 mm to 50 mm. This avoids the problem of a large height difference affecting the battery cell assembly space, while also avoiding the problem of a small height difference causing poor positioning. Thus, the battery cell casing 10 of the present embodiment combines the advantages of large assembly space and good positioning.

[0042] Optionally, the height difference between the end of the inner shell 1 and the end of the outer shell 2 at the open end can be 0.5mm, 1.0mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50mm.

[0043] The height of the inner shell 1 is lower than that of the outer shell 2. Therefore, the battery cell shell 10 of the embodiment of the present invention helps to form a sealed fit between the cooling channel 3 and the shell.

[0044] The present application is not limited thereto. In other embodiments, the height of the inner shell 1 may be higher than the height of the outer shell 2 .

[0045] like Figure 1As shown, the housing 2 has a first side wall 21 and a second side wall 22 adjacent to each other. The area of ​​the first side wall 21 is greater than or equal to the area of ​​the second side wall 22. The liquid inlet 33 or the liquid outlet 34 of the cooling channel 3 is provided on the first side wall 21. It is understood that the liquid inlet 33 or the liquid outlet 34 of the cooling channel 3 is provided on the side wall of the housing 2 with the larger area.

[0046] In the battery cell casing 10 of the present embodiment, the liquid inlet 33 or liquid outlet 34 of the cooling channel 3 is located on a larger side wall of the outer shell 2. A larger heat exchange area improves heat exchange efficiency. Furthermore, the battery cell casing 10 improves the cooling efficiency of the winding core 30.

[0047] The housing 2 has a third sidewall, which is disposed opposite the first sidewall 21. The liquid inlet 33 of the cooling channel 3 is disposed on the first sidewall 21, and the liquid outlet 34 of the cooling channel 3 is disposed on the third sidewall. It is understood that the liquid inlet 33 and the liquid outlet 34 of the cooling channel 3 are disposed opposite each other.

[0048] The battery cell housing 10 of the embodiment of the present invention facilitates connectivity between the cooling channels 3 on multiple battery cells by arranging the liquid inlet 33 and the liquid outlet 34 of the cooling channels 3 opposite each other. This simplifies the arrangement of the battery module cooling circuits. Consequently, the battery cell housing 10 has the advantage of a simple structure.

[0049] Specifically, the cell housing 10 can have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the cell housing 10 can be determined based on the specific shape and size of the winding core 30. The cell housing 10 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0050] Furthermore, if Figure 1 As shown, along the length direction of the battery cell (for example, Figure 1 (As shown in the front-to-back direction, the liquid inlet 33 of the cooling channel 3 is located in the middle of the first side wall 21, and the liquid outlet 34 of the cooling channel 3 is located in the middle of the third side wall. This provides ample space for piping to connect the cooling channels 3 of adjacent battery cells, minimizing interference during installation.

[0051] The outer shell 2 is detachably mounted on the inner shell 1. Thus, the battery cell housing 10 has the advantage of being easy to assemble and disassemble.

[0052] like Figure 4As shown, the battery cell housing 10 of the embodiment of the present invention further includes a support member 4, which is supported between the bottom wall of the inner shell 1 and the bottom wall of the outer shell 2. A first channel 31 is formed between the bottom wall of the inner shell 1 and the bottom wall of the outer shell 2, and a gap is provided between the side wall of the inner shell 1 and the side wall of the outer shell 2 to form a second channel 32. The first channel 31 and the second channel 32 are connected to form a cooling channel 3. It can be understood that multiple surfaces of the battery cell are cooling surfaces, which avoids the problem of large temperature differences at different positions of a single battery cell. Specifically, both the inner shell 1 and the outer shell 2 have an opening at the open end, and the gap between the inner shell 1 and the outer shell 2 is also sealed by the end cover 20 at the open end.

[0053] The cell housing 10 of the embodiment of the present invention can achieve rapid and uniform cooling of the cell by forming cooling surfaces on the sides and bottom of the cell housing 10. Thus, the cell housing 10 further improves the cooling effect of the cell.

[0054] For example, when the shell is a rectangular shell, the battery cell can achieve five-sided cooling.

[0055] Furthermore, the support member 4 may be a strip-shaped structure, and the support member 4 extends along the direction from the first side wall 21 to the third side wall.

[0056] The battery cell of this embodiment of the present invention includes a winding core 30, an end cap 20, and a battery cell casing 10 according to any of the above embodiments. The winding core 30 is disposed within an inner casing 1. The end cap 20 has a stepped portion 201 that abuts against the ends of the inner casing 1 and the outer casing 2, respectively. It will be understood that the end cap 20 is mounted on the open end of the battery cell casing 10 to seal the open end.

[0057] The battery cell of the embodiment of the present invention has an end cap 20 with a stepped portion 201. The stepped portion 201 abuts against the ends of the inner shell 1 and the outer shell 2, respectively. This seals the battery cell and allows for rapid positioning of the end cap 20. As a result, the battery cell of the embodiment of the present invention has the advantages of good positioning accuracy and high assembly efficiency.

[0058] The assembly method of the battery cell of the embodiment of the present invention is based on the battery cell of any of the above items. The core 30 is first loaded into the inner shell 1 and then liquid is injected. The outer wall of the inner shell 1 is clamped. After the core 30 is formed and divided into volumes, the preform formed by the core 30 and the inner shell 1 is loaded into the outer shell 2, and finally the end cover 20 is installed on the open end.

[0059] The assembly method of the battery cell of the embodiment of the present invention is as follows: when assembling the battery cell, the winding core 30 is first assembled and installed in the inner shell 1. After the liquid is injected, the outer wall of the inner shell 1 is clamped, and then the winding core 30 is formed and divided. The winding core 30 can be directly clamped by the inner shell 1 and sufficient extrusion support is provided, avoiding the problem of directly installing the winding core 30 into the battery cell housing 10. Due to the gap between the inner shell 1 and the outer shell 2, it is impossible to directly clamp and provide sufficient extrusion support, resulting in gas in the battery cell, increasing the distance between the pole pieces, and abnormal interfaces. As a result, the performance of the battery cell is improved.

[0060] The battery pack according to the embodiment of the present invention may include the battery cell described above.

[0061] Therefore, the battery pack according to the embodiment of the present invention has the advantages of good positioning accuracy and high assembly efficiency.

[0062] A vehicle according to an embodiment of the present invention includes the battery pack described above.

[0063] Therefore, the vehicle according to the embodiment of the present invention has the advantages of good positioning accuracy and high assembly efficiency.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0066] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0068] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean 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 present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A battery cell shell, characterized in that: One end of the battery cell housing has an open end capable of cooperating with an end cover, and the battery cell housing comprises: An inner shell and an outer shell, wherein the inner shell is nested in the outer shell and a cooling channel is formed between the inner shell and the outer shell. At the open end, there is a height difference between the end of the inner shell and the end of the outer shell in the height direction of the battery cell.

2. The battery cell housing according to claim 1, wherein: The height difference is 0.5 mm to 50 mm; and / or the height of the inner shell is lower than the height of the outer shell.

3. The battery cell housing according to claim 1, wherein: The housing has a first side wall and a second side wall that are adjacent to each other. The area of ​​the first side wall is greater than or equal to the area of ​​the second side wall. The liquid inlet or the liquid outlet of the cooling channel is arranged on the first side wall.

4. The battery cell housing according to claim 3, wherein: The housing has a third side wall, which is arranged opposite to the first side wall. The liquid inlet of the cooling channel is arranged on the first side wall, and the liquid outlet of the cooling channel is arranged on the third side wall.

5. The battery cell casing according to claim 1, wherein: The outer shell can be detachably sleeved on the outer shell.

6. The battery cell casing according to claim 5, characterized in that: It also includes a support member, which is supported between the bottom wall of the inner shell and the bottom wall of the outer shell, a first channel is formed between the bottom wall of the inner shell and the bottom wall of the outer shell, a gap is provided between the side wall of the inner shell and the side wall of the outer shell to form a second channel, and the first channel and the second channel are connected to form the cooling channel.

7. A battery cell, characterized in that: The battery cell shell comprises a winding core, an end cover and the battery cell shell according to any one of claims 1 to 6, wherein the winding core is arranged in the inner shell, the end cover has a step portion, and the step portion abuts against the end of the inner shell and the end of the outer shell.

8. A method for assembling a battery cell as claimed in claim 7, characterized in that: After the core is loaded into the inner shell, liquid is injected, the outer wall of the inner shell is clamped, the core is formed and divided into volumes, and then the preform formed by the core and the inner shell is loaded into the outer shell, and finally the end cover is installed on the open end.

9. A battery pack, characterized in that: The invention comprises a battery cell according to claim 7.

10. A vehicle, characterized in that: Comprising the battery pack according to claim 9.

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