Battery cell shell group and battery cell

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell shell group and a battery cell. A first connecting position and a second connecting position which are spaced along the radial direction of the battery core and are arranged on the same plane are formed on a shell or a cover plate in the battery core shell group; the first connecting position comprises a first convex part which protrudes out of the outer surface of the shell or the cover plate in the axial direction of the battery cell and a second convex part which protrudes out of the inner surface of the shell or the cover plate; a through hole penetrating through the shell or the cover plate is formed in the second connecting position; the pole assembly is mounted at the second connecting position; the first insulating part is arranged between the outer surface of the shell or the cover plate and the pole assembly; the second insulating part is arranged on one side, facing the interior of the battery cell, of the shell or the cover plate. The first tab and the second tab which are opposite in polarity can extend out of the same side of the battery cell, the internal resistance of the battery cell is reduced, the first connecting position is provided with the convex part, the rigidity of the shell or the cover plate is improved, the impact of external force is resisted, the service life of the battery cell is prolonged, and the safety performance of the battery cell is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a cell casing assembly 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, a casing, and a cover. The positive and negative tabs on the electrode arrays are located on opposite sides, and the terminals are located on the cover or casing. 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 battery cell housing and a battery cell to solve the problem that the positive and negative tabs of the existing battery are placed on opposite sides of the axial direction, resulting in a long current flow path, high internal resistance, and affecting the performance and safety of the battery.

[0004] A first aspect of the present invention provides a battery cell housing assembly, wherein the battery cell housing assembly comprises: The housing or cover plate has a first connection position and a second connection position that are radially spaced along the battery cell and disposed on the same plane; the first connection position includes a first protrusion that protrudes from the outer surface of the housing or cover plate in the axial direction of the battery cell and a second protrusion that protrudes from the inner surface of the housing or cover plate; the second connection position is formed as a through hole through the housing or cover plate; The pole assembly is installed at the second connection position; A first insulating element is disposed between the outer surface of the housing or cover plate and the pole assembly; The second insulating element is disposed on the side of the housing or cover plate facing the inside of the cell. The second insulating element has a first through hole for the second protrusion to pass through and a second through hole for the pole assembly to pass through. The first and second tabs with opposite polarities on the electrode assembly are respectively connected to the second protrusion and the pole post assembly.

[0005] Preferably, the second insulating member is attached to the inner surface of the housing or cover plate facing the cell, and a partition portion protruding towards the inside of the cell is formed on the second insulating member; the partition portion is sandwiched between the first tab and the second tab in the radial direction of the cell.

[0006] Preferably, in the arrangement direction of the first connecting position and the second connecting position, the width of the partition is B, in mm; the distance between the first electrode and the second electrode is A, in mm; 10%≤B / A≤95%. Preferably, the first protrusion is formed as an annular structure, and the second protrusion is disposed in the annular area enclosed by the first protrusion; in the radial direction of the cell, the distance between the outer annular wall of the first protrusion and the inner annular wall of the first protrusion is L, where L≥2mm.

[0007] Preferably, in the axial direction of the battery cell, the distance between the side of the first protrusion facing the outside of the battery cell and the outer surface of the housing or cover plate is C1, in mm; in the axial direction of the battery cell, the distance between the side of the pole assembly facing the outside of the battery cell and the outer surface of the housing or cover plate is C, in mm; 0 < C1 / C ≤ 1.

[0008] Preferably, the pole assembly includes: The first electrode post has a first mounting portion and a second mounting portion formed on its circumferential sidewall, which protrude radially outward along the cell. The first mounting portion and the second mounting portion are disposed opposite each other at their two axial ends. A portion of the first insulating member is sandwiched between the first mounting portion and the outer surface of the housing or cover plate, and a portion of the second insulating member is sandwiched between the second mounting portion and the inner surface of the housing or cover plate. A receiving groove is provided on the side of the first electrode post facing the outside of the cell. The second electrode post is assembled in the receiving groove, and the end of the second electrode post facing the outside of the cell extends out of the receiving groove in the axial direction of the cell.

[0009] Preferably, the wall of the receiving groove is formed with a stepped portion, the second electrode post abuts against the stepped portion, the stepped portion is disposed on the opening side of the receiving groove, and the stepped portion is formed by the groove wall of the receiving groove being recessed inward along the radial direction of the battery cell.

[0010] Preferably, the wall of the receiving groove is formed with a stepped portion, the second electrode post abuts against the stepped portion, the stepped portion is disposed on the bottom side of the receiving groove, and the stepped portion is formed by the groove wall of the receiving groove protruding outward along the radial direction of the battery cell. Preferably, it further includes: The sealing element is formed as an annular structure sleeved on the first electrode post; in the axial direction of the cell, part of the sealing element is sandwiched between the first insulating element and the second mounting part, and part of the sealing element is sandwiched between the inner surface of the housing or cover plate and the second mounting part.

[0011] A second aspect of the present invention provides a battery cell comprising the battery cell housing assembly described in any of the above technical solutions.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: In the battery cell housing assembly of the present invention, the housing or cover plate has a first connection position and a second connection position that are radially spaced along the battery cell and disposed on the same plane; the first connection position includes a first protrusion that protrudes from the outer surface of the housing or cover plate in the axial direction of the battery cell and a second protrusion that protrudes from the inner surface of the housing or cover plate; the second connection position is formed as a through hole penetrating the housing or cover plate; the electrode assembly is installed at the second connection position; a first insulating member is disposed between the outer surface of the housing or cover plate and the electrode assembly; the second insulating member is disposed on the side of the housing or cover plate facing the inside of the battery cell, and the second insulating member has an opening for the second protrusion to pass through. The battery has a first connecting hole and a second connecting hole through which the electrode assembly passes; the first and second tabs with opposite polarities on the electrode assembly are respectively connected to the second protrusion and the electrode assembly, so that the first and second tabs with opposite polarities can extend from the same side of the battery cell, reducing the internal resistance of the battery cell. The first connection position has a protrusion, which increases the rigidity of the housing or cover plate to resist the impact of external forces, improve the service life and safety performance of the battery cell. In addition, the height dimension of the first connection position and the electrode assembly in the axial direction of the battery cell is shortened compared with the electrode structure on the existing battery cell, which helps to improve the space utilization of the battery cell, thereby increasing the energy density of the battery cell.

[0013] 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

[0014] 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.

[0015] Figure 1 This is an exploded structural diagram of the battery cell housing assembly provided in an embodiment of the present invention; Figure 2 This is a partially enlarged cross-sectional view of the first structure of the battery cell housing assembly provided in an embodiment of the present invention; Figure 3 This is a partially enlarged cross-sectional view of the second structure of the battery cell housing assembly provided in an embodiment of the present invention; Figure 4 This is a partially enlarged cross-sectional view of the assembled battery cell housing and electrode assembly provided in an embodiment of the present invention.

[0016] Icons: 10 - Housing or cover plate; 11 - First connection position; 111 - First protrusion; 112 - Second protrusion; 113 - First recess; 114 - Second recess; 12 - Second connection position; 20 - Pole post assembly; 21 - First pole post; 211 - First mounting part; 212 - Second mounting part; 213 - Receiving groove; 2131 - Stepped part; 22 - Second pole post; 30 - First insulating element; 40 - Second insulating element; 41 - First connecting hole; 42 - Second connecting hole; 43 - Separator; 44 - Third connecting hole; 50 - Seal; 60 - Pole group; 61 - First pole tab; 62 - Second pole tab. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] 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.

[0020] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] According to a first aspect of the present invention, a battery cell housing assembly is provided, comprising a housing or cover plate 10, an electrode assembly 20, a first insulating member 30, and a second insulating member 40. The specific structure of the battery cell housing assembly according to this embodiment as described above will be described below.

[0027] The outer casing of the battery cell includes a housing and a cover plate, which together form a closed cavity to house the electrode assembly 60. Both the housing and the cover plate are metal components, such as aluminum or steel.

[0028] In this embodiment, the housing or cover plate 10 has a first connection position 11 and a second connection position 12 formed on the same plane and spaced radially along the battery cell. That is, the portions of the battery cell used to lead out the first tab 61 and the second tab 62 (the first connection position 11 and the second connection position 12) are disposed on the same plane of the housing or on the surface of the cover plate. Figures 1 to 4 As shown, when the first connection position 11 and the second connection position 12 are provided on the housing, the first connection position 11 and the second connection position 12 are provided on the bottom wall of the housing.

[0029] Specifically, in this embodiment, such as Figures 1 to 3 As shown, the first connection position 11 includes a first protrusion 111 protruding from the outer surface of the housing or cover plate 10 in the axial direction of the battery cell and a second protrusion 112 protruding from the inner surface of the housing or cover plate 10. That is, the first protrusion 111 protrudes outward of the battery cell and is used to connect the battery cell to the components that need to be connected, such as a busbar. The second protrusion 112 protrudes inward of the battery cell and is used to connect one of the first tab 61 and the second tab 62 on the electrode group 60. The second connection position 12 is formed as a through hole penetrating the housing or cover plate 10. The pole post assembly 20 is installed on the second connection position 12. The pole post assembly 20 is used to connect the other of the first tab 61 and the second tab 62 on the electrode group 60 and the components that need to be connected to the battery cell, such as a busbar.

[0030] The first insulating element 30 is disposed between the outer surface of the housing or cover plate 10 and the electrode assembly 20; the second insulating element 40 is disposed on the side of the housing or cover plate 10 facing the inside of the cell. The second insulating element 40 has a first connecting hole 41 for the second protrusion 112 to pass through and a second connecting hole 42 for the electrode assembly 20 to pass through. The first connecting hole 41 and the second connecting hole 42 are arranged at intervals along the radial direction of the cell and correspond to the second protrusion 112 and the electrode assembly 20 respectively in the axial direction of the cell, so as to achieve insulation protection between the electrode assembly 20 and the housing or cover plate 10 and between the electrode group 60 and the housing or cover plate 10, and ensure the safety performance of the cell. The first insulating element 30 and the second insulating element 40 are both plastic parts with insulating properties, such as PP or PPS materials.

[0031] The present invention enables the first tab 61 and the second tab 62 with opposite polarities to extend from the same side of the battery cell, thereby reducing the internal resistance of the battery cell. The first connection position 11 forms a concave-convex structure, which increases the rigidity of the shell or cover plate 10 to resist the impact of external forces, thereby improving the service life and safety performance of the battery cell. In addition, the height dimension of the first connection position 11 and the pole assembly 20 in the axial direction of the battery cell is shortened compared with the pole structure on the existing battery cell, which helps to improve the space utilization of the battery cell, thereby increasing the energy density of the battery cell.

[0032] In this embodiment, the first electrode 61 and the second electrode 62 have opposite polarities; optionally, the first electrode 61 is a positive electrode and the second electrode 62 is a negative electrode; in other optional embodiments, the first electrode 61 is a negative electrode and the second electrode 62 is a positive electrode.

[0033] It should be noted that, in this embodiment, the cell axis is as follows: Figures 2 to 4 The vertical direction from a certain angle, the radial direction of the battery cell is as follows: Figures 2 to 4 The horizontal direction from the perspective of view.

[0034] In this embodiment, as Figures 2 to 4 As shown, the second insulating member 40 is attached to the inner surface of the housing or cover plate 10 facing the cell. A partition 43 protruding towards the inside of the cell is formed on the second insulating member 40. The partition 43 is sandwiched between the first tab 61 and the second tab 62 in the radial direction of the cell. This separates the first tab 61 and the second tab 62 with opposite polarities, forming insulation protection and helping the tabs to close up to avoid the tabs overlapping and causing a short circuit.

[0035] Preferably, the separator 43 is formed as a strip structure, and the length direction of the separator 43 is perpendicular to the arrangement direction of the first connecting position 11 and the second connecting position 12. Optionally, a groove is provided on the side of the separator 43 facing the outside of the battery cell to reduce the weight of the second insulating member 40, such as... Figures 1 to 4 As shown, the partition 43 is provided with a third connecting hole 44, and the third connecting hole 44 is provided with multiple holes, at least some of which are connected to the exhaust passage on the electrode group 60 to meet the exhaust requirements.

[0036] Furthermore, in this embodiment, as Figure 4 As shown, in the arrangement direction of the first connecting position 11 and the second connecting position 12, the width of the partition 43 is B, in mm; the distance between the first electrode 61 and the second electrode 62 is A, in mm; 10%≤B / A≤95%, thus avoiding poor insulation effect of the second insulating member 40 due to the size of B / A being too small, increasing the risk of insulation failure between the first electrode 61 and the second electrode 62, and also avoiding damage to the electrode due to the size of B / A being too large. The reliability of the 10%≤B / A≤95% limit condition in this invention was verified through multiple sets of cell assembly tests. After each set of cells was assembled, insulation tests and CT tests were performed on the cells. The test results are shown in Table 1.

[0037] Table 1

[0038] In this embodiment, as Figures 1 to 4 As shown, the first protrusion 111 is formed into a ring structure, such as a semi-circular, circular, or polygonal ring structure, and the second protrusion 112 is disposed within the ring area enclosed by the first protrusion 111; as Figure 4 As shown, in the radial direction of the battery cell, the distance between the outer annular wall of the first protrusion 111 and the inner annular wall of the first protrusion 111 is L, where L≥2mm. This ensures that the battery cell can be smoothly welded to external connecting components, especially meeting the welding requirements with the busbar.

[0039] In this embodiment, as Figure 4 As shown, the distance between the side of the first protrusion 111 facing the outside of the cell and the outer surface of the housing or cover plate 10 is C1, in mm; in the axial direction of the cell, the distance between the side of the pole assembly 20 facing the outside of the cell and the outer surface of the housing or cover plate 10 is C, in mm; 0 < C1 / C ≤ 1, so as to avoid the excessively large parameter of C1 / C occupying the height of the cell in the axial direction, affecting the space utilization of the cell, and also to avoid the size of C1 / C being too small, affecting the rigidity of the cell housing assembly and making it easy to deform.

[0040] The reliability of the limiting condition 0<C1 / C≤1 in this invention is verified by assembling multiple sets of battery cells with different C and C1 sizes. In each embodiment or comparative example, multiple battery cells with the same C and C1 sizes are assembled. The test results are shown in Table 2.

[0041] Table 2

[0042] In a preferred embodiment, the first connection position 11 further includes a second recess 114 formed on the outer surface of the housing or cover plate 10 along the cell axial direction and a first recess 113 formed on the inner surface of the housing or cover plate 10. The first recess 113 and the first protrusion 111 are arranged opposite to each other along the cell axial direction, and the second recess 114 and the second protrusion are arranged opposite to each other along the cell axial direction, so that the first connection position 11 forms a concave-convex structure to reduce the weight of the housing or cover plate 10 and help to improve rigidity. The first connection position 11 can be directly formed by stamping process.

[0043] In this embodiment, as Figures 1 to 4As shown, the pole assembly 20 includes a first pole 21 and a second pole 22 that are separately arranged. The first pole 21 and the second pole 22 can be fixed by welding after assembly and positioning.

[0044] Specifically, the first pole post 21 has a first mounting portion 211 and a second mounting portion 212 protruding radially outward at both ends along the axial direction of the battery cell. That is, the circumferential sidewall of the first pole post 21 has the first mounting portion 211 and the second mounting portion 212 protruding radially outward. The first mounting portion 211 and the second mounting portion 212 are positioned opposite each other at the two ends along the axial direction of the first pole post 21. Specifically, the first mounting portion 211 is located outside the battery cell, and the second mounting portion 212 is located inside the battery cell. The first mounting portion 211 and the second mounting portion 212 can be formed as an annular plate structure, such as... Figure 4 As shown, a portion of the first insulating member 30 is sandwiched between the first mounting portion 211 and the outer surface of the housing or cover plate 10, and a portion of the second insulating member 40 is sandwiched between the second mounting portion 212 and the inner surface of the housing or cover plate 10.

[0045] like Figure 4 As shown, the first electrode post 21 has a receiving groove 213 on the side facing the outside of the battery cell; the second electrode post 22 is formed into a block structure and is assembled in the receiving groove 213, with the end of the second electrode post 22 extending out of the receiving groove 213 on the axial direction of the battery cell.

[0046] Specifically, in this embodiment, such as Figure 4 As shown, the second pole post 22 and the first protrusion 111 are used to connect to the busbar as described above, so that the second pole post 22 occupies the space in the receiving groove 213 of the first pole post 21, which can reduce the distance between the second pole post 22 and the outer surface of the housing or cover plate 10, thereby reducing the space occupied by the pole post assembly 20 in the axial direction of the cell.

[0047] In a first alternative implementation, such as Figure 2 and Figure 4 As shown, the groove wall of the receiving groove 213 has a stepped portion 2131, and the second pole post 22 abuts against the stepped portion 2131. The stepped portion 2131 is provided on the opening side of the receiving groove 213. The stepped portion 2131 is formed by the groove wall of the receiving groove 213 being recessed inward along the radial direction of the battery cell, so that the stepped portion 2131 forms an annular groove structure. The circumferential sidewall of the second pole post 22 has a boss that abuts against the stepped portion 2131, thereby fixing the position of the second pole post 22 in the axial direction of the battery cell.

[0048] In a second alternative implementation, such as Figure 3As shown, the groove wall of the receiving groove 213 has a stepped portion 2131, and the second pole post 22 abuts against the stepped portion 2131. The stepped portion 2131 is located on the bottom side of the receiving groove 213. The stepped portion 2131 is formed by the groove wall of the receiving groove 213 protruding outward along the radial direction of the battery cell, so that the stepped portion 2131 forms an annular protrusion structure. The bottom of the second pole post 22 abuts against the surface of the stepped portion 2131 facing the outside of the battery cell, thereby fixing the position of the second pole post 22 in the axial direction of the battery cell. Furthermore, in this embodiment, such as Figures 1 to 4 As shown, the battery cell housing assembly also includes a sealing element 50; the sealing element 50 is formed as an annular structure sleeved on the first pole post 21, and the sealing element 50 can be an elastic sealing ring; in the axial direction of the battery cell, part of the sealing element 50 is sandwiched between the first insulating element 30 and the second mounting part 212, and part of the sealing element 50 is sandwiched between the inner surface of the housing or cover plate 10 and the second mounting part 212, so that the sealing element 50 generates two compressions after assembly, thus ensuring the sealing performance of the battery cell housing assembly.

[0049] According to a battery cell housing assembly provided by the present invention, the housing or cover plate has a first connection position and a second connection position formed at radial intervals along the battery cell and disposed on the same plane; the first connection position includes a first protrusion protruding from the outer surface of the housing or cover plate in the axial direction of the battery cell and a second protrusion protruding from the inner surface of the housing or cover plate; the second connection position is formed as a through hole penetrating the housing or cover plate; an electrode assembly is installed at the second connection position; a first insulating member is disposed between the outer surface of the housing or cover plate and the electrode assembly; the second insulating member is disposed on the side of the housing or cover plate facing the inside of the battery cell, and the second insulating member has a second connection position for the battery cell to be connected. The protrusion passes through a first connecting hole and a second connecting hole for the electrode assembly to pass through; the first and second tabs with opposite polarities on the electrode assembly are respectively connected to the second protrusion and the electrode assembly, so that the first and second tabs with opposite polarities can extend from the same side of the cell, reducing the internal resistance of the cell. The first connection position has a protrusion, which increases the rigidity of the shell or cover to resist the impact of external forces, improves the service life and safety performance of the cell. In addition, the height dimension of the first connection position and the electrode assembly in the axial direction of the cell is shortened compared with the electrode structure on the existing cell, which helps to improve the space utilization of the cell, thereby increasing the energy density of the cell.

[0050] The battery cell provided by the present invention includes the battery cell housing assembly as described above, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0051] 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 assembly, characterized in that, The cell housing assembly includes: The housing or cover plate has a first connection position and a second connection position that are radially spaced along the battery cell and disposed on the same plane; the first connection position includes a first protrusion that protrudes from the outer surface of the housing or cover plate in the axial direction of the battery cell and a second protrusion that protrudes from the inner surface of the housing or cover plate; the second connection position is formed as a through hole through the housing or cover plate; The pole assembly is installed at the second connection position; A first insulating element is disposed between the outer surface of the housing or cover plate and the pole assembly; The second insulating element is disposed on the side of the housing or cover plate facing the inside of the cell. The second insulating element has a first through hole for the second protrusion to pass through and a second through hole for the pole assembly to pass through. The first and second tabs with opposite polarities on the electrode assembly are respectively connected to the second protrusion and the pole post assembly.

2. The cell housing assembly according to claim 1, characterized in that, The second insulating member is attached to the surface of the housing or cover plate facing the inside of the cell, and a partition portion protruding towards the inside of the cell is formed on the second insulating member; the partition portion is sandwiched between the first tab and the second tab in the radial direction of the cell.

3. The cell housing assembly according to claim 2, characterized in that, In the arrangement direction of the first connection position and the second connection position, the width of the partition is B, in mm; the distance between the first electrode and the second electrode is A, in mm. 10% ≤ B / A ≤ 95%.

4. The cell casing assembly according to claim 1, characterized in that, The first protrusion is formed into a ring structure, and the second protrusion is disposed in the ring area enclosed by the first protrusion; in the radial direction of the cell, the distance between the outer ring wall of the first protrusion and the inner ring wall of the first protrusion is L, where L≥2mm.

5. The cell housing assembly according to claim 1, characterized in that, Along the axial direction of the battery cell, the distance between the side of the first protrusion facing the outside of the battery cell and the outer surface of the housing or cover plate is C1, in mm; along the axial direction of the battery cell, the distance between the side of the pole assembly facing the outside of the battery cell and the outer surface of the housing or cover plate is C, in mm; 0 < C1 / C ≤ 1.

6. The cell housing assembly according to claim 1, characterized in that, The pole assembly includes: The first electrode post has a first mounting portion and a second mounting portion formed on its circumferential sidewall, which protrude radially outward along the cell. The first mounting portion and the second mounting portion are disposed opposite each other at their two axial ends. A portion of the first insulating member is sandwiched between the first mounting portion and the outer surface of the housing or cover plate, and a portion of the second insulating member is sandwiched between the second mounting portion and the inner surface of the housing or cover plate. A receiving groove is provided on the side of the first electrode post facing the outside of the cell. The second electrode post is assembled in the receiving groove, and the end of the second electrode post facing the outside of the cell extends out of the receiving groove in the axial direction of the cell.

7. The cell housing assembly according to claim 6, characterized in that, The accommodating groove has a stepped portion formed in the groove wall, and the second electrode post abuts against the stepped portion. The stepped portion is located on the opening side of the accommodating groove, and the stepped portion is formed by the groove wall of the accommodating groove being recessed inward along the radial direction of the battery cell.

8. The cell housing assembly according to claim 6, characterized in that, The accommodating groove has a stepped portion formed in the groove wall, and the second electrode post abuts against the stepped portion. The stepped portion is located on the bottom side of the accommodating groove and is formed by the groove wall of the accommodating groove protruding outward along the radial direction of the battery cell.

9. The cell housing assembly according to claim 6, characterized in that, Also includes: The sealing element is formed as an annular structure sleeved on the first electrode post; in the axial direction of the cell, part of the sealing element is sandwiched between the first insulating element and the second mounting part, and part of the sealing element is sandwiched between the inner surface of the housing or cover plate and the second mounting part.

10. A battery cell, characterized in that, Includes the cell housing assembly according to any one of claims 1 to 9.

Images