Battery cell shell and battery cell

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell shell and a battery cell. A first connecting area and a second connecting area which are arranged at an interval along the radial direction of the battery are formed on the top wall part of the battery core shell; the first connecting area comprises a first convex part which is arranged in a manner of protruding out of the outer surface of the top wall part in the axial direction of the battery and a second convex part which is arranged in a manner of protruding out of the inner surface of the top wall part; a first groove is formed in one side, facing the interior of the battery cell, of the first convex part, and a second groove is formed in one side, facing the exterior of the battery cell, of the second convex part; according to the battery cell shell, the positive electrode and the negative electrode can extend out of the same side of the battery cell shell, the current flowing path is reduced, the internal resistance is reduced, the performance and the safety performance of the battery cell are improved, the rigidity of the battery cell shell can be improved through the concave-convex structure of the first connecting area, and the reliability of the battery cell shell is improved. And the non-deformability of the battery cell shell is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a cell housing and a cell. Background Technology

[0002] Cylindrical batteries are widely used due to their mature manufacturing process and good rate performance. Traditional cylindrical batteries consist of electrode arrays, current collectors, and a casing. The positive and negative tabs on the electrode arrays are located on opposite sides. This means that when cylindrical batteries are assembled into modules, the current passes through a large area of ​​the casing, resulting in a longer path, increased internal resistance, and negatively impacting discharge voltage and efficiency. It also increases the risk of thermal runaway, affecting battery performance and safety. Furthermore, existing casings are prone to deformation under external forces, further affecting battery performance and safety. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a cell housing and a cell to solve the problem that in existing cylindrical batteries, the positive and negative electrodes are located on both sides of the axial direction, resulting in a longer current flow path, increased internal resistance, and affecting the performance and safety of the battery.

[0004] The first aspect of the present invention provides a battery cell housing, wherein the battery cell housing includes a top wall portion and a side wall portion; The top wall portion has a first connection area and a second connection area that are radially spaced along the battery. The first connection area includes a first protrusion that protrudes from the outer surface of the top wall portion in the axial direction of the battery and a second protrusion that protrudes from the inner surface of the top wall portion. The first protrusion has a first groove on the side facing the inside of the battery cell, and the second protrusion has a second groove on the side facing the outside of the battery cell. The second connection area is formed as a through hole penetrating the top wall portion.

[0005] Preferably, the first protrusion is formed as an annular structure surrounding the second protrusion; The first groove is formed as an annular groove. The distance between the inner and outer annular walls of the annular groove in the radial direction of the cell is H, where 1mm≤H≤5mm. The dimension of the side wall portion in the radial direction of the battery is D, in mm, where 2%≤H / D≤10%. Preferably, the second protrusion is formed as an annular structure surrounding the first protrusion; The second groove is formed as an annular groove. The distance between the inner and outer annular walls of the annular groove in the radial direction of the cell is H, where 1mm≤H≤5mm. The dimension of the side wall portion in the radial direction of the battery is D, in mm, where 2%≤H / D≤10%. Preferably, in the radial direction of the battery cell, the distance between the first connection area and the outer surface of the sidewall portion is L1, where 1mm≤L1≤10mm. Preferably, in the radial direction of the battery cell, the distance between the first connection area and the second connection area is L2, where 3mm ≤ L2 ≤ 30mm.

[0006] Preferably, the angle between the sidewall of the second groove and the bottom wall of the second groove is α, where 90°≤α≤155°.

[0007] Preferably, the angle between the sidewall of the first protrusion and the outer surface of the top wall is β, where 90°≤β≤155°. Preferably, in the axial direction of the battery cell, the top wall portion is provided with a third groove and a third protrusion that are opposite to each other along the axial direction of the battery cell; in the radial direction of the battery cell, the third groove and the third protrusion are disposed between the first connection area and the second connection area.

[0008] Preferably, the third protrusion is disposed on the outer surface of the top wall portion, and the height dimension of the third protrusion in the axial direction of the battery cell is less than the height dimension of the first protrusion in the axial direction of the battery cell. Alternatively, the third protrusion may be disposed on the inner surface of the top wall portion, wherein the height dimension of the third protrusion in the axial direction of the battery cell is greater than the height dimension of the second protrusion in the axial direction of the battery cell.

[0009] A second aspect of the present invention provides a battery cell comprising the battery cell housing described in any of the above technical solutions.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: The battery cell housing of the present invention includes a top wall portion and a side wall portion; a first connection area and a second connection area are formed on the top wall portion at radial intervals along the battery; the first connection area includes a first protrusion protruding from the outer surface of the top wall portion in the axial direction of the battery and a second protrusion protruding from the inner surface of the top wall portion; the first protrusion has a first groove on the side facing the inside of the battery cell, and the second protrusion has a second groove on the side facing the outside of the battery cell; the second connection area is formed as a through hole penetrating the top wall portion, so that the positive and negative electrodes can extend from the same side of the battery cell housing, reducing the current flow path, reducing internal resistance, improving battery cell performance and safety performance, and the concave and convex structure of the first connection area can also improve the rigidity of the battery cell housing, improve the deformation resistance of the battery cell housing, and improve the service life of the battery cell housing and the battery cell.

[0011] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention; Figure 2 This is a partially enlarged schematic diagram of the first structure of the battery cell housing provided in an embodiment of the present invention; Figure 3 This is a partially enlarged schematic diagram of a second structure of the battery cell housing provided in an embodiment of the present invention; Figure 4 This is a partially enlarged schematic diagram of a third structure of the battery cell housing provided in an embodiment of the present invention; Figure 5 This is a partially enlarged schematic diagram of the fourth structure of the battery cell housing provided in an embodiment of the present invention; Figure 6 A partially enlarged schematic diagram of the fifth structure of the battery cell housing provided in an embodiment of the present invention; Figure 7 This is a partially enlarged schematic diagram of the sixth structure of the battery cell housing provided in an embodiment of the present invention.

[0014] Icons: 1-cell casing; 11-top wall; 12-side wall; 101-first connection area; 102-second connection area; 111-first protrusion; 112-first groove; 113-second protrusion; 114-second groove; 115-third protrusion; 116-third groove. Detailed Implementation

[0015] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0016] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0017] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0018] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0019] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0020] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0021] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0022] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0023] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0024] According to a first aspect of the present invention, a battery cell housing is provided. The specific structure of the battery cell housing according to this embodiment will be described below.

[0025] In this embodiment, as Figures 1 to 7 As shown, the cell housing 1 has a cavity inside for assembling components such as electrode groups. The cell housing 1 includes a top wall portion 11 and a side wall portion 12. The side wall portion 12 is formed as a cylindrical annular side wall, and the top wall portion 11 is formed as a circular plate structure. The top wall portion 11 has a first connection area 101 and a second connection area 102 that are arranged radially at intervals along the battery to connect the electrode tabs on the electrode group to external connection components, such as busbars, so as to lead out the polarity and realize the transmission of electrical energy.

[0026] Specifically, the first connection area 101 includes a first protrusion 111 protruding from the outer surface of the top wall portion 11 in the axial direction of the battery and a second protrusion 113 protruding from the inner surface of the top wall portion 11. The first protrusion 111 is used to connect to the external connection components of the battery cell, such as a busbar, which can be welded to the surface of the first protrusion 111 facing the outside of the battery cell. The second protrusion 113 is used to connect to one of the positive and negative tabs inside the battery cell housing 1, which can be welded to the surface of the second protrusion 113 facing the inside of the battery cell. The second connection area 102 is formed as a through hole penetrating the top wall portion 11. The second connection area 102 can be used to assemble components such as terminals, insulating plastic, and sealing rings. The other of the positive and negative tabs can be connected to the external connection components of the battery cell through the terminal. In this way, the positive and negative electrodes can extend from the same side of the battery cell housing 1, reducing the current flow path, reducing internal resistance, and improving the performance and safety of the battery cell.

[0027] More specifically, the first protrusion 111 has a first groove 112 on the side facing the inside of the battery cell, and the second protrusion 113 has a second groove 114 on the side facing the outside of the battery cell. This makes the first connection area 101 have an uneven structure to improve the rigidity of the battery cell housing 1. The uneven structure of the first connection area 101 can also improve the rigidity of the battery cell housing 1, improve the deformation resistance of the battery cell housing 1, and improve the service life of the battery cell housing 1 and the battery cell.

[0028] The first protrusion 111, the first groove 112, the second protrusion 113, and the second groove 114 can be directly formed on the top wall 11 by stamping, which has the advantages of high production efficiency and ease of preparation.

[0029] It should be noted that, in this embodiment, the cell axis is... Figures 2 to 7 The vertical direction from a certain angle, the radial direction of the battery cell is... Figures 2 to 7 The horizontal direction from the perspective of view.

[0030] In one alternative implementation, such as Figure 2 , Figure 4 and Figure 6 As shown, the first protrusion 111 is formed as an annular structure surrounding the second protrusion 113, and the second protrusion 113 is located within the annular area surrounded by the first protrusion 111. Correspondingly, the first groove 112 is formed as an annular groove. The distance between the inner and outer annular walls of the annular groove in the radial direction of the cell is H, where 1mm≤H≤5mm. The dimension of the side wall portion 12 in the radial direction of the battery is D, in mm, which is the diameter of the cell housing 1. 2%≤H / D≤10% is used to avoid H being too small, which would make processing difficult, and also to avoid H being too large, which would affect welding. In another alternative implementation, such as Figure 3 , Figure 5 and Figure 7 As shown, the second protrusion 113 is formed as an annular structure surrounding the first protrusion 111, and the first protrusion 111 is located in the annular area surrounded by the second protrusion 113. Correspondingly, the second groove 114 is formed as an annular groove. The distance between the inner and outer annular walls of the annular groove in the radial direction of the cell is H, where 1mm≤H≤5mm. The dimension of the side wall portion 12 in the radial direction of the battery is D, in mm, that is, the diameter of the cell housing 1 is D, where 2%≤H / D≤10%. This avoids H being too small, which would make processing difficult, and also avoids H being too large, which would affect welding. The forming process of the cell housing 1 with different parameters H and D is tested below. In each embodiment, multiple cell housings 1 with the same H and D dimensions are tested, and the test results are shown in Table 1.

[0031] Table 1

[0032] Preferably, the first protrusion 111 or the second protrusion 113 is a semi-circular annular structure, and the second connection area 102 is formed as a semi-circular through hole to fit the top wall portion 11 of the cylindrical battery cell; in other alternative embodiments, the shape of the first protrusion 111 and the second connection area 102 may also be circular, elliptical or polygonal, etc.

[0033] like Figures 2 to 7 As shown, in the radial direction of the battery cell, the distance between the first connection area 101 and the outer surface of the sidewall portion 12 is L1, where 1mm≤L1≤10mm, thus avoiding the difficulty in processing and forming due to L1 being too small. like Figures 2 to 7 As shown, in the radial direction of the cell, the distance between the first connection area 101 and the second connection area 102 is L2, 3mm≤L2≤30mm. This avoids the difficulty of processing and forming due to L2 being too small, and improves the production yield of the cell casing 1.

[0034] The forming process of the cell housing 1 with different parameters L1 and L2 is tested below. In each embodiment, multiple cell housings 1 with the same L1 and L2 size are tested, and the test results are shown in Table 2.

[0035] Table 2

[0036] In this embodiment, as Figure 2As shown, the angle between the sidewall and the bottom wall of the second groove 114 is α, 90°≤α≤155°. The side of the second protrusion 113 facing the inside of the cell is parallel to the bottom wall of the second groove 114. The sidewall of the second protrusion 113 is parallel to the sidewall of the second groove 114, so as to facilitate processing and meet the installation requirements of the tab.

[0037] In this embodiment, as Figure 2 As shown, the angle between the sidewall of the first protrusion 111 and the outer surface of the top wall 11 is β, 90°≤β≤155°, so as to facilitate processing and meet the installation requirements of the external connection components of the battery cell.

[0038] The forming process of the cell housing 1 with different parameters α and β is tested below. In each embodiment, multiple cell housings 1 with the same α and β dimensions are tested, and the test results are shown in Table 3.

[0039] Table 3

[0040] In a preferred embodiment, such as Figures 4 to 7 As shown, in the axial direction of the battery cell, the top wall portion 11 is provided with a third groove 116 and a third protrusion 115 that are opposite to each other along the axial direction of the battery cell. The third groove 116 and the third protrusion 115 can be directly formed on the top wall portion 11 by stamping. In the radial direction of the battery cell, the third groove 116 and the third protrusion 115 are disposed between the first connection area 101 and the second connection area 102. The third protrusion 115 can be formed into a strip-shaped protrusion structure, and the third groove 116 is correspondingly formed into a strip-shaped groove. This further improves the rigidity of the top wall portion 11 and enhances the reliability of the battery cell housing 1 in resisting external impact.

[0041] Preferably, in this embodiment, such as Figure 6 and Figure 7 As shown, the third protrusion 115 is provided on the outer surface of the top wall portion 11. The height dimension of the third protrusion 115 in the axial direction of the battery cell is less than the height dimension of the first protrusion 111 in the axial direction of the battery cell. In this way, while improving the rigidity of the battery cell housing 1, the third protrusion 115 is avoided from causing interference and affecting the assembly of the first protrusion with the connecting parts outside the battery cell.

[0042] Preferably, in this embodiment, such as Figure 4 and Figure 5 As shown, the third protrusion 115 is disposed on the inner surface of the top wall portion 11. The height dimension of the third protrusion 115 in the axial direction of the cell is greater than the height dimension of the second protrusion 113 in the axial direction of the cell, so that the third protrusion 115 can play a role in limiting the electrode group in the axial direction, reducing the risk of electrode tab tearing caused by electrode group movement.

[0043] According to the present invention, a battery cell housing includes a top wall and a side wall. The top wall has a first connection region and a second connection region formed at radial intervals along the battery. The first connection region includes a first protrusion protruding from the outer surface of the top wall in the axial direction of the battery and a second protrusion protruding from the inner surface of the top wall. The first protrusion has a first groove on the side facing the inside of the battery cell, and the second protrusion has a second groove on the side facing the outside of the battery cell. The second connection region is formed as a through hole penetrating the top wall, thus enabling the positive and negative electrodes to extend from the same side of the battery cell housing, reducing the current flow path, lowering internal resistance, improving battery cell performance and safety performance. Furthermore, the concave-convex structure of the first connection region can also improve the rigidity of the battery cell housing, enhance its resistance to deformation, and extend the service life of both the battery cell housing and the battery cell.

[0044] The battery cell provided by the present invention includes the battery cell housing as described above, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0045] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery cell housing, characterized in that, The battery cell housing includes a top wall and a side wall; The top wall portion has a first connection area and a second connection area that are radially spaced along the battery. The first connection area includes a first protrusion that protrudes from the outer surface of the top wall portion in the axial direction of the battery and a second protrusion that protrudes from the inner surface of the top wall portion. The first protrusion has a first groove on the side facing the inside of the battery cell, and the second protrusion has a second groove on the side facing the outside of the battery cell. The second connection area is formed as a through hole penetrating the top wall portion.

2. The cell housing according to claim 1, characterized in that, The first protrusion is formed as a ring structure surrounding the second protrusion; The first groove is formed as an annular groove. The distance between the inner and outer annular walls of the annular groove in the radial direction of the cell is H, where 1mm≤H≤5mm. The dimension of the side wall portion in the radial direction of the battery is D, in mm, where 2%≤H / D≤10%.

3. The cell housing according to claim 1, characterized in that, The second protrusion is formed as an annular structure surrounding the first protrusion; The second groove is formed as an annular groove. The distance between the inner and outer annular walls of the annular groove in the radial direction of the cell is H, where 1mm≤H≤5mm. The dimension of the side wall portion in the radial direction of the battery is D, in mm, where 2%≤H / D≤10%.

4. The cell housing according to claim 1, characterized in that, In the radial direction of the cell, the distance between the first connection area and the outer surface of the sidewall portion is L1, where 1mm≤L1≤10mm.

5. The cell housing according to claim 1, characterized in that, In the radial direction of the cell, the distance between the first connection area and the second connection area is L2, where 3mm≤L2≤30mm.

6. The cell housing according to claim 1, characterized in that, The angle between the sidewall and the bottom wall of the second groove is α, where 90°≤α≤155°.

7. The cell housing according to claim 1, characterized in that, The angle between the sidewall of the first protrusion and the outer surface of the top wall is β, where 90°≤β≤155°.

8. The cell housing according to claim 1, characterized in that, Along the axial direction of the battery cell, the top wall portion is provided with a third groove and a third protrusion that are opposite to each other along the axial direction of the battery cell; in the radial direction of the battery cell, the third groove and the third protrusion are disposed between the first connection area and the second connection area.

9. The cell housing according to claim 8, characterized in that, The third protrusion is disposed on the outer surface of the top wall portion, and the height dimension of the third protrusion in the axial direction of the battery cell is less than the height dimension of the first protrusion in the axial direction of the battery cell. Alternatively, the third protrusion may be disposed on the inner surface of the top wall portion, wherein the height dimension of the third protrusion in the axial direction of the battery cell is greater than the height dimension of the second protrusion in the axial direction of the battery cell.

10. A battery cell, characterized in that, The battery cell housing includes any one of claims 1 to 9.

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