Cylindrical battery and battery pack

Abstract

The utility model relates to battery technical field discloses a kind of cylindrical battery and battery pack, cylindrical battery includes: battery core;Cover plate assembly;Current collection component, connect between battery core and cover plate assembly;First current collection piece is electrically connected with pole, and the region of pole in the inside of shell and second current collection piece are arranged in the same end surface of battery core;Along axial direction, the projection of the side of pole close to battery core in second current collection piece and second current collection piece at least partially overlap, to form overlap area;Insulating layer, at least partially between second current collection piece and pole, the projection of insulating layer in the plane perpendicular to axial direction covers overlap area;The width of insulating layer along radial direction is d1, the width of overlap area along radial direction is d2, the value range of d1 / d2 satisfies:1.1≤d1 / d2≤5.The cylindrical battery provided by the utility model guarantees the insulating effect of second current collection piece and pole, avoids the short-circuit situation that pole and opposite current collection piece contact.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cylindrical battery and battery pack. Background Technology

[0002] A cylindrical battery consists of a cell and a cover plate. The cell has tabs, and the cover plate has terminals. In order to connect the tabs and terminals, a current collector is used to achieve the transfer connection.

[0003] Both the current collector and the terminal are mounted on the cover plate. Due to the large area of ​​the terminal, after assembly, there is a possibility that the terminal may come into contact with the current collector carrying opposite polarity, which could cause a short circuit in the battery. Utility Model Content

[0004] In view of this, the present invention provides a cylindrical battery and battery pack to solve the problem that the terminals and current collectors with opposite polarity are prone to contact, causing short circuits in the battery.

[0005] In a first aspect, this utility model provides a cylindrical battery, comprising: The battery cell includes a first tab and a second tab extending from the same end along the axial direction, and the first tab and the second tab have opposite polarities. A cover plate assembly includes a cover plate body and a pole post disposed through the cover plate body; A current collector assembly is connected between the battery cell and the cover plate assembly. The current collector assembly includes a first current collector electrically connected to a first electrode tab and a second current collector electrically connected to a second electrode tab. The first current collector is electrically connected to a terminal post, and the area of ​​the terminal post inside the housing and the second current collector are disposed on the same end face of the battery cell. Along the axial direction, the projection of the side of the terminal post closer to the battery cell onto the second current collector at least partially overlaps with the second current collector to form an overlap area. An insulating layer is at least partially disposed between the second current collector and the pole post, and the projection of the insulating layer onto the plane perpendicular to the axial direction covers the overlapping area. The width of the insulating layer in the radial direction is d1, and the width of the overlapping area in the radial direction is d2. The value range of d1 / d2 satisfies: 1.1≤d1 / d2≤5; An insulating layer is disposed on the side of the cover plate body facing the current collector assembly, and is at least partially disposed around the pole post; The first current collector extends toward the pole and has a protrusion, which is electrically connected to the pole; the projection of the insulating layer along the axial direction does not overlap with the protrusion.

[0006] Beneficial effects: By setting an insulating layer between the second current collector and the terminal post, and ensuring that the projection of the insulating layer along the axial direction covers the overlapping area, the insulation effect between the second current collector and the terminal post is guaranteed, preventing short circuits caused by contact between the terminal post and a current collector of a different shape. The width of the insulating layer in the radial direction must be sufficient to cover the overlapping area. If the width of the insulating layer in the radial direction is too small, the overlapping area will be exposed, and there will still be a risk of contact between the terminal post and a current collector of a different shape. If the width of the insulating layer in the radial direction is too large, it may easily affect the heat dissipation of the cover plate assembly and the current collector assembly.

[0007] Secondly, this utility model also provides a battery pack, including a cylindrical battery.

[0008] Since the battery pack includes cylindrical cells and has the same effect as cylindrical cells, it will not be elaborated further here. Attached Figure Description

[0009] To more clearly illustrate the specific embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the cylindrical battery of this utility model; Figure 2 This is an exploded view of the cylindrical battery of this utility model; Figure 3 This is a schematic diagram of the current collector assembly and the cover plate assembly when the current collector assembly of this utility model is in a disassembled state; Figure 4 This is a schematic diagram of the cover plate assembly and the current collection assembly of this utility model in the disassembled state; Figure 5 This is a schematic diagram showing the fit between the electrode post, the insulating layer, and the current collector assembly of this utility model; Figure 6 This is a front view of the current collector assembly and cover plate assembly of this utility model; Figure 7 For the present utility model in Figure 6 A schematic diagram of the current collector assembly and electrode in the AA cross-section state; Figure 8 For the present utility model in Figure 6 Exploded view of the insulation layer, current collector assembly and terminal block under the AA cross-section condition; Explanation of reference numerals in the attached figures: 1. Housing; 2. Battery cell; 21. First tab; 22. Second tab; 3. Cover plate assembly; 31. Insulation layer; 32. Pole post; 321. Flanged part; 33. Cover plate body; 4. Current collector assembly; 41. First current collector; 42. Second current collector; 43. Assembly; 44. Protrusion. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0012] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0014] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0015] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0016] According to an embodiment of the present invention, in one aspect, a cylindrical battery is provided, comprising: Battery cell 2 includes a first tab 21 and a second tab 22 extending from the same end along the axial direction, and the first tab 21 and the second tab 22 have opposite polarities; The cover plate assembly 3 includes a cover plate body 33 and a pole post 32 disposed through the cover plate body 33; A current collector assembly 4 is connected between the battery cell 2 and the cover plate assembly 3. The current collector assembly 4 includes a first current collector 41 electrically connected to the first electrode 21 and a second current collector 42 electrically connected to the second electrode 22. The first current collector 41 is electrically connected to the electrode post 32. The area of ​​the electrode post 32 inside the housing and the second current collector 42 are located on the same end face of the battery cell 2. Along the axial direction, the projection of the side of the electrode post 32 near the battery cell 2 onto the second current collector 42 at least partially overlaps with the second current collector 42 to form an overlap area. An insulating layer 31 is at least partially disposed between the second current collector 42 and the pole post 32, and the projection of the insulating layer 31 onto the plane perpendicular to the axial direction covers the overlapping area. The width of the insulating layer 31 in the radial direction is d1, and the width of the overlapping area in the radial direction is d2. The value range of d1 / d2 satisfies: 1.1≤d1 / d2≤5; An insulating layer 31 is disposed on the side of the cover plate body 33 facing the current collector 4, and is disposed at least partially around the pole post 32; The first current collector 41 extends toward the pole post 32 and forms a protrusion 44, which is electrically connected to the pole post 32; the projection of the insulating layer 31 along the axial direction does not overlap with the protrusion 44.

[0017] It should be noted that, since the cylindrical battery is cylindrical in shape, the axial direction of cell 2 refers to the direction parallel to the centerline of the cylinder. Specifically, in this embodiment, the axial direction of cell 2 refers to... Figure 2 The arrow direction is shown.

[0018] Because the end face area of ​​a cylindrical battery is limited, there is a radial competition between the terminal 32 and the current collector, and both are led out from the same end. This can easily lead to contact between the terminal 32 and the current collector, causing a short circuit. In contrast, for a prismatic battery, because its terminals are located at both ends with a larger distance between them, the problem of short circuits caused by contact between opposite terminals does not occur.

[0019] The cylindrical battery of this embodiment includes a cylindrical housing 1, with an opening formed on at least one side of the housing 1 along the axial direction. A cover plate assembly 3 is placed over the opening of the housing 1. The housing 1 and the cover plate assembly 3 are sealed together and enclosed to form a hollow cavity. The battery cell 2 is disposed in the hollow cavity.

[0020] Since the first tab 21 and the second tab 22 are both led out from the same end of the battery cell 2 along the axial direction, and the first tab 21 and the second tab 22 are arranged at intervals around the end face of the battery cell 2 along the axial direction, in this embodiment, the first tab 21 and the second tab 22 are both constructed in a fan shape.

[0021] The cover plate assembly 3 is provided with a pole post 32. In this embodiment, the pole post 32 is constructed as a cylindrical shape or a rotating body structure formed around the axis. The cover plate assembly 3 includes a cover plate body 33, and the pole post 32 is disposed through the cover plate body 33.

[0022] To facilitate the electrical connection between the battery cell 2 and the cover plate assembly 3, a current collector 4 is provided between them to facilitate the transfer connection.

[0023] The current collector assembly 4 includes a first current collector 41 electrically connected to the first tab 21 and a second current collector 42 electrically connected to the second tab 22. One of the first current collector 41 and the second current collector 42 is electrically connected to the terminal post 32, and the projection of the other current collector along the axial direction at least partially overlaps with the side of the terminal post 32 near the cell 2 to form an overlap area. Taking the first current collector 41 electrically connected to the terminal post 32 as an example, since the second current collector 42 needs to be adapted to the shape of the second tab 22, and the internal space of the cylindrical battery is compact, the projection of the second current collector 42 along the axial direction at least partially overlaps with the side of the terminal post 32 near the cell 2. If the projection of the second current collector 42 along the axial direction does not overlap with the side of the terminal post 32 near the cell 2, it is easy to cause the cylindrical battery size to be too large or the second tab 22 size to be too small, which is not conducive to current transmission.

[0024] Combination Figure 3 As shown, the current collection assembly 4 also includes an assembly 43, on which the first current collector 41 and the second current collector 42 are mounted together to form a whole.

[0025] In one implementation, the first current collector 41 can be a positive current collector, and the second current collector 42 can be a negative current collector. In another implementation, the first current collector 41 can be a negative current collector, and the second current collector 42 can be a positive current collector.

[0026] When the projection of the second current collector 42 along the axial direction at least partially overlaps with the side of the terminal 32 closest to the cell 2, forming an overlapping area, a short circuit may occur due to the opposite polarity of the current collector 42 and the terminal 32 coming into contact. Conversely, a similar situation will occur when the second current collector 42 is electrically connected to the terminal 32, which will not be elaborated here. The following text still takes the electrical connection of the first current collector 41 and the terminal 32 as an example.

[0027] This embodiment provides insulation between the second current collector 42 and the terminal post 32 by providing an insulating layer 31. The projection of the insulating layer 31 onto the plane perpendicular to the axis covers the overlapping area, thus ensuring the insulation effect between the second current collector 42 and the terminal post 32 and preventing short circuits caused by contact between the terminal post 32 and a current collector of a different shape. The width of the insulating layer 31 in the radial direction must be sufficient to cover the overlapping area. If the width of the insulating layer 31 in the radial direction is too small, the overlapping area will be exposed, and there will still be a risk of contact between the terminal post 32 and the current collector of a different shape. If the width of the insulating layer 31 in the radial direction is too large, it may affect the heat dissipation of the cover plate assembly 3 and the current collector assembly 4.

[0028] This embodiment ensures that the width of the insulating layer 31 in the radial direction is sufficient to cover the overlapping area by limiting the lower limit of the ratio of the width d1 of the insulating layer 31 in the radial direction to the width d2 of the overlapping area in the radial direction. This avoids the overlapping area being exposed due to the width of the insulating layer 31 in the radial direction being too small, thereby reducing the risk of contact between the pole post 32 and the current collector of the opposite direction. Furthermore, by limiting the upper limit of the ratio of the width d1 of the insulating layer 31 in the radial direction to the width d2 of the overlapping area in the radial direction, this embodiment avoids the insulating layer 31 in the radial direction being too wide, which could easily affect the heat dissipation of the cover plate assembly 3 and the current collector assembly 4.

[0029] In some embodiments, the insulating layer 31 is disposed on the side of the cover plate body 33 facing the current collector 4, and is disposed at least partially around the pole post 32.

[0030] In this embodiment, the insulating layer 31 is at least partially disposed around the pole post 32, so that the insulating layer 31 can at least cover the area where the pole post 32 and the opposite current collector overlap. By disposing the insulating layer 31 on the side of the cover plate body 33 facing the current collector assembly 4, the insulation effect between the pole post 32 and the opposite current collector is guaranteed, and the situation of short circuit caused by contact between the pole post 32 and the opposite current collector is avoided.

[0031] In some embodiments, combined with Figure 8 As shown, one of the first current collector 41 and the second current collector 42 extends toward the pole post 32 and has a protrusion 44, which is electrically connected to the pole post 32.

[0032] In some embodiments, the projection of the insulating layer 31 along the axial direction does not overlap with the protrusion 44.

[0033] The first current collector 41 extends toward the pole post 32 and forms a protrusion 44. By inserting the protrusion 44 into the groove and fixing it by welding, the first current collector 41 and the pole post 32 are fixedly connected. In this embodiment, by ensuring that the projection of the insulating layer 31 along the axial direction does not overlap with the protrusion 44, the insulating layer 31 can be prevented from affecting the insertion of the protrusion into the pole post recess, thus avoiding poor contact between the protrusion 44 and the wall surface inside the groove.

[0034] To ensure a good welding result, the protrusion 44 needs to fit tightly against the bottom wall of the groove.

[0035] In some embodiments, the insulating layer 31 is disposed around the pole post 32.

[0036] In this embodiment, the insulating layer 31 is annular with a hollowed-out design in the middle, allowing it to surround the electrode post 32. This ensures better insulation between the electrode post 32 and the current collector of different shapes, preventing short circuits caused by contact between the electrode post 32 and the current collector. Simultaneously, it provides clearance for the connection between the protrusion 44 and the electrode post 32, preventing interference and ensuring good contact between them.

[0037] In some embodiments, the insulating layer 31 is discontinuously arranged around the pole post 32.

[0038] In this embodiment, the insulating layer 31 is disposed on the side of the cover plate body 33 facing the current collector assembly 4, so that the insulating layer 31 can at least cover the area where the pole post 32 and the non-standard current collector overlap, thereby ensuring the insulation effect between the pole post 32 and the non-standard current collector and preventing short circuits caused by contact between the pole post 32 and the non-standard current collector. Furthermore, the insulating layer 31 is disposed discontinuously around the pole post 32, ensuring that gaps are reserved between the insulating layers 31, which can achieve better heat dissipation.

[0039] In some embodiments, the width d1 of the insulating layer 31 in the radial direction is within the range of 1mm ≤ d1 ≤ 15mm.

[0040] By limiting the lower limit of the radial width d1 of the insulating layer 31, it is ensured that the radial width d1 of the insulating layer 31 is sufficient to cover the overlapping area, thereby avoiding exposure of the overlapping area and the risk of contact between the electrode post 32 and the current collector of the opposite orientation. Furthermore, by limiting the upper limit of the radial width d1 of the insulating layer 31, it is possible to prevent the radial width of the insulating layer 31 from being too large, which could easily affect the heat dissipation of the cover plate assembly 3 and the current collector assembly 4, thus ensuring effective heat dissipation.

[0041] In this embodiment, the width d1 of the insulating layer 31 in the radial direction can be 1mm, 2mm, 4mm, 5mm, 7mm, 8mm, 10mm, 13mm, 14mm, or 15mm, etc.

[0042] In some embodiments, the distance between the electrode post 32 on the side closest to the cell 2 and the vertical distance between the second current collector 42 is d4, and the thickness of the insulating layer 31 is d3, satisfying: 0mm 2 <d3·d4≤3mm 2 .

[0043] Since the insulating layer 31 needs to ensure insulation between the pole 32 and the current collector, the vertical distance d4 between the pole 32 and the second current collector 42 can be appropriately large, thereby ensuring that the risk of the pole 32 and the second current collector 42 conducting is small. At this time, the thickness of the insulating layer 31 can be appropriately small.

[0044] If the vertical distance d4 between the pole post 32 and the second current collector 42 is close, the risk of conduction between the pole post 32 and the second current collector 42 is relatively high. In this case, the thickness of the insulating layer 31 should be increased to ensure the insulation effect and reduce the risk of contact between the pole post 32 and the opposite current collector.

[0045] In some embodiments, combined with Figure 8 As shown, the electrode post 32 is folded outward along the radial direction on the side closest to the cell 2 to form a flange 321.

[0046] The cover plate body 33 has a pole through hole. During the assembly stage, the pole 32 is fixed to both sides of the cover plate body 33 by passing the pole through the pole through hole and folding the pole 32 to form a flange 321.

[0047] On the side of the terminal post 32 facing the cell 2, a groove is formed radially inside the area enclosed by the flange 321. Correspondingly, the first current collector 41 extends toward the terminal post 32 and forms a protrusion 44. By inserting the protrusion 44 into the groove and fixing it by welding, the first current collector 41 and the terminal post 32 are fixedly connected.

[0048] In this embodiment, the insulating layer 31 is attached to the flange portion 321.

[0049] In some embodiments, the thickness d3 of the insulating layer 31 is in the range of 0.02mm≤d3≤0.5mm.

[0050] When the thickness d3 of the insulating layer 31 is too thin, there is a risk of insulation failure. When the thickness d3 of the insulating layer 31 is too thick, it will increase the welding distance between the protrusion 44 and the bottom wall of the groove, causing the protrusion 44 to be unable to fully contact the bottom wall of the groove, which can easily cause poor welding and affect the electrical connection between the first current collector 41 and the pole post 32.

[0051] According to an embodiment of the present invention, another aspect provides a battery pack, including the cylindrical battery as described above.

[0052] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A cylindrical battery, characterized in that, include: The battery cell (2) includes a first tab (21) and a second tab (22) extending from the same end along the axial direction, and the first tab (21) and the second tab (22) have opposite polarities; The cover plate assembly (3) includes a cover plate body (33) and a pole post (32) disposed through the cover plate body (33); A current collector assembly (4) is connected between the battery cell (2) and the cover plate assembly (3); the current collector assembly (4) includes a first current collector (41) electrically connected to the first tab (21) and a second current collector (42) electrically connected to the second tab (22); the first current collector (41) is electrically connected to the pole post (32), and the area of ​​the pole post (32) inside the housing and the second current collector (42) are disposed on the same end face of the battery cell (2); along the axial direction, the projection of the side of the pole post (32) near the battery cell (2) onto the second current collector (42) at least partially overlaps with the second current collector (42) to form an overlap area; An insulating layer (31) is at least partially disposed between the second current collector (42) and the pole post (32), and the projection of the insulating layer (31) onto the plane perpendicular to the axial direction covers the overlapping area; The width of the insulating layer (31) in the radial direction is d1, and the width of the overlapping area in the radial direction is d2. The value range of d1 / d2 satisfies: 1.1≤d1 / d2≤5; The insulating layer (31) is disposed on the side of the cover plate body (33) facing the current collection assembly (4), and is disposed at least partially around the pole post (32); The first current collector (41) extends toward the pole post (32) and has a protrusion (44) thereon, the protrusion (44) being electrically connected to the pole post (32); The projection of the insulating layer (31) along the axial direction does not overlap with the protrusion (44).

2. The cylindrical battery according to claim 1, characterized in that, The insulating layer (31) is disposed around the pole (32).

3. The cylindrical battery according to claim 1, characterized in that, The distance between the side of the electrode post (32) closest to the battery cell (2) and the vertical direction of the second current collector (42) is d4, and the thickness of the insulating layer (31) is d3, satisfying: 0mm 2 <d3·d4≤3mm 2 .

4. The cylindrical battery according to claim 1, characterized in that, The thickness d3 of the insulating layer (31) is in the range of 0.02mm≤d3≤0.5mm.

5. The cylindrical battery according to claim 1, characterized in that, The insulating layer (31) is discontinuously arranged around the pole (32).

6. The cylindrical battery according to claim 1, characterized in that, The width d1 of the insulating layer (31) in the radial direction has the following range: 1mm≤d1≤15mm.

7. A battery pack, characterized in that, Including the cylindrical battery as described in any one of claims 1 to 6 above.

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