Cover plate assembly and battery

Abstract

The invention discloses a cover plate assembly and a battery, and relates to the technical field of batteries, the cover plate assembly comprises a cover plate, a pressing ring and a pole, and the cover plate is provided with a mounting hole arranged in a front-back penetrating manner along the thickness direction of the cover plate; the pole is arranged in the mounting hole in a penetrating manner; the pressing ring is arranged on the front side of the cover plate and sleeves the pole, and the pressing ring is welded and fixed with the peripheral side of the pole; the width of the pressing ring is W, the thickness of the pressing ring is H1, the diameter of the pole is D, and the area of the front end face of the pole is S. By controlling the width W of the pressing ring and the diameter D of the pole, the pressing ring can provide enough welding area, and the welding mark can reach enough connection width, so that stable connection between the pole and the pressing ring is ensured; by controlling the thickness H1 of the pressing ring and the area S of the front end face of the pole, the welding mark can reach enough connection depth, the connection force of the welding mark is improved, and the problem of welding failure of the pole and the pressing ring is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a cover plate assembly and a battery. Background Art

[0002] A power battery is a battery that provides a power source for tools. It generally includes a metal shell, a battery cell disposed in the metal shell, and a cover assembly fixed to the top of the metal shell. The cover assembly is provided with a pole electrically connected to the battery cell, so that the pole plays the role of power battery power transmission. The battery flow area refers to the area through which electrons pass during the charge and discharge process of the battery. The size of the battery flow area directly affects the performance and safety of the battery. When designing a battery, in order to increase the battery flow area, it is generally chosen to increase the area of ​​the pole.

[0003] Existing cover plate assemblies generally have a compression ring installed outside the pole. By welding the compression ring to the pole, the pole can maintain good structural performance under a certain vertical pressure. However, when increasing the overcurrent area of ​​the battery, the increased pole area may compress the area of ​​the compression ring, resulting in a reduction in the area of ​​the compression ring. When the compression ring and the pole only rely on the welding point as the connection point, the small area of ​​the compression ring can easily make it difficult for the compression ring to bear the vertical load of the pole, resulting in failure of the welding between the compression ring and the pole. This situation is particularly prominent when the pole is welded with a bus bar. Summary of the invention

[0004] The object of the present invention is to provide a cover plate assembly and a battery, which improves the matching relationship between the pressure ring and the pole plate so that the pressure ring and the pole can be tightly connected, thereby avoiding the problem of welding failure between the pressure ring and the pole.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A cover plate assembly, comprising:

[0007] A cover plate, wherein the cover plate is provided with mounting holes that penetrate the cover plate from front to back along the thickness direction thereof;

[0008] A pole, the pole being passed through the mounting hole;

[0009] A pressure ring, which is arranged on the front side of the cover plate and sleeved on the pole, and the pressure ring is fixed to the outer peripheral side of the pole by welding;

[0010] The width of the pressure ring is W, the thickness of the pressure ring is H1, the diameter of the pole is D, the area of ​​the front end surface of the pole is S, and the above parameters satisfy:

[0011]

[0012] The area S of the front end face of the pole is the area of ​​the end face corresponding to the diameter D of the pole, and the width W of the pressure ring is the shortest distance from the inner edge to the outer edge of the pressure ring.

[0013] In some embodiments, the width W of the pressure ring satisfies: 2≤W≤4 mm, and the diameter D of the pole satisfies: 10≤D≤30 mm.

[0014] In some embodiments, the thickness H1 of the pressure ring satisfies: 1.5≤H1≤3mm, and the area S of the front end surface of the pole satisfies: 79≤S≤706mm 2 .

[0015] In some embodiments, the outer contour of the pressure ring is circular or polygonal.

[0016] In some embodiments, an insulating member is further included, wherein the insulating member is disposed between the pressure ring and the cover plate to separate the pressure ring from the cover plate; and

[0017] The elastic modulus of the insulating member is E, and the elastic modulus E satisfies: 1≤E≤20GPa.

[0018] In some embodiments, the cover plate includes a supporting portion, the rear side of the insulating member is attached to the supporting portion, and the front side of the insulating member is attached to the pressure ring; and,

[0019] The thickness of the supporting portion is H2, and the thickness H2 of the supporting portion satisfies: 0.5≤H2≤2mm.

[0020] In some embodiments, the pole comprises:

[0021] A main body portion, the main body portion is arranged along the front-to-back direction and penetrates the mounting hole;

[0022] A limiting portion, the limiting portion is formed at the rear end of the main body and extends toward the outside of the main body, and

[0023] A sealing member is arranged between the limiting portion and the cover plate.

[0024] In some embodiments, a protrusion is provided on the front end surface of the pole, the protrusion extends toward the front side along the thickness direction thereof, and cooperates with the outer peripheral side of the pole to form a step.

[0025] In some embodiments, the thickness of the protrusion is H3, and the thickness H3 of the protrusion satisfies: 0.2≤H3≤1 mm.

[0026] In some embodiments, the rear end surface of the pole is recessed toward the front side along the thickness direction thereof to form a recessed portion.

[0027] In some embodiments, the thickness of the pressure ring is H1, the area of ​​the front end surface of the pole is S, and the above parameters satisfy:

[0028]

[0029] In some embodiments, the depth of the recessed portion is H4, and the depth H4 of the recessed portion satisfies: 1≤H4≤4 mm.

[0030] Based on the above-mentioned cover plate assembly, the present application also provides a battery, which includes any of the above-mentioned cover plate assemblies.

[0031] Compared with the prior art, the cover plate assembly and battery implemented in this application have the following beneficial effects:

[0032] The cover plate assembly of the present application controls the width W of the pressure ring and the diameter D of the pole within a suitable range, so that when the pole and the pressure ring are welded and fixed, the pressure ring can provide a sufficient welding area, so that the weld mark can reach a sufficient connection width to ensure a stable connection between the pole and the pressure ring. In addition, the cover plate assembly of the present application controls the thickness H1 of the pressure ring and the area S of the front end face of the pole within a suitable range, so that the weld mark can reach a sufficient connection depth, further improving the connection force of the weld mark, so that even when the cover plate assembly is equipped with a bus, the welding structure between the pole and the pressure ring has sufficient connection strength and connection quality, effectively avoiding the problem of welding failure between the pole and the pressure ring.

[0033] Moreover, the cover plate assembly of the present application reduces the weight of the pole by setting a recessed portion on the pole, thereby reducing the traction force of the pole on the weld mark, so that the area of ​​the pressure ring can be further reduced, and the area of ​​the pole can be further expanded, thereby increasing the current flow area of ​​the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of a cover plate assembly in an embodiment of the present application;

[0035] Figure 2 is a top view of the cover plate assembly in an embodiment of the present application;

[0036] Figure 3 yes Figure 2 Schematic diagram of the AA section;

[0037] Figure 4 yes Figure 3 Another example schematic diagram of the structure shown;

[0038] Figure 5 is a schematic diagram of a cover plate in an embodiment of the present application;

[0039] Figure 6 is a schematic diagram of a pressure ring in an embodiment of the present application;

[0040] Figure 7 Schematic diagram of the pole in the embodiment of the present application.

[0041] In the figure, 100, cover plate assembly;

[0042] 1. Cover plate; 10. Supporting part; 2. Pole; 20. Main body; 21. Limiting part; 22. Recessed part; 23. Raised part; 3. Pressing ring; 4. Insulating part; 5. Welding mark; 6. Sealing part; 7. Mounting hole; 8. Step. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] In the description of the present invention, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] In the description of the present invention, it should be understood that the terms "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, it should be understood that the terms "first" and "second" are used in the present invention for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0047] Example

[0048] like Figure 1-7 As shown, the embodiment of the present application provides a cover plate assembly 100, which is suitable for a power battery. With the output interface of the power battery facing the front side, and the side opposite to the front side being the rear side, the cover plate assembly 100 includes a cover plate 1, a pole 2, a pressure ring 3 and an insulating member 4, wherein the cover plate 1 is provided with a mounting hole 7 that is arranged through the front and back along the thickness direction thereof, the pole 2 is penetrated through the mounting hole 7, so that part of the pole 2 passes through the mounting hole 7 and extends to the front side of the mounting hole 7, the pressure ring 3 is provided on the front side of the cover plate 1 and is sleeved on the pole 2, and the pressure ring 3 is welded and fixed to the outer peripheral side of the pole 2.

[0049] It is understandable that the welding strength between the pressure ring 3 and the pole 2 affects the structural stability of the pole 2, especially when the cover assembly 100 needs to be equipped with a busbar, the busbar is welded to the front end face of the pole 2, which will increase the weight of the pole 2. Moreover, the busbar may generate a certain pulling force during operation, causing the pole 2 to bear more load in the thickness direction. In order to ensure that there is sufficient connection force between the pressure ring 3 and the pole 2, the pressure ring 3 and the pole 2 need to match each other, wherein the width of the pressure ring 3 is W, the thickness of the pressure ring 3 is H1, the diameter of the pole 2 is D, and the area of ​​the front end face of the pole 2 is S. The above parameters meet:

[0050]

[0051] The area S of the front end face of the pole 2 is the end face area corresponding to the diameter D of the pole 2 , and the width W of the pressing ring 3 is the shortest distance from the inner edge to the outer edge of the pressing ring 3 .

[0052] By matching the pressure ring 3 with the pole 2, it is possible to ensure that the weld mark 5 between the pressure ring 3 and the pole 2 has sufficient connection force, so that the pressure ring 3 and the pole 2 are firmly connected, and even if the pole 2 is pulled by the bus bar, the weld mark 5 is not prone to connection failure. Moreover, the pressure ring 3 and the pole 2 are matched with each other, and when the area S of the pole 2 is adjusted, the pressure ring 3 can continue to meet the connection requirements with the pole 2, so that the pressure ring 3 and the pole 2 are firmly connected.

[0053] Generally speaking, the pressing ring 3 is a circular ring structure, so that it can be sleeved on the pole 2, so the width W of the pressing ring 3 is the ring width of the pressing ring 3. Of course, the outer contour of the pressing ring 2 can also be a polygon, so that the pressing ring 2 and the cover plate 1 can cooperate with each other. For example, the pressing ring 3 with a polygonal outer contour can prevent the pressing ring 3 from rotating relative to the pole 2, and avoid the pressing ring 3 rotating relative to the pole 2 and causing the front car weld mark 5, causing welding failure. Of course, when the outer contour of the pressing ring 3 is a polygon, the width of the pressing ring 3 is still the shortest distance from the inner edge of the pressing ring 3 to its outer edge.

[0054] According to the specifications of the power battery, in order to ensure that the structural strength of the pressure ring 3 can meet the load-bearing requirements, as an example of this embodiment, the width W of the pressure ring 3 can meet the following conditions: 2≤W≤4mm. For example, the width W of the pressure ring 3 can be 2mm, 2.5mm, 3mm, 3.5mm, or 4mm, so as to adapt to the power battery. Of course, in addition to considering the width W of the pressure ring 3, the structural strength of the pressure ring also needs to consider the thickness H1 of the pressure ring. As an example of this embodiment, the thickness H1 of the pressure ring can meet the following conditions: 1.5≤H1≤3mm. For example, the thickness H1 of the pressure ring can be 1.5mm, 2mm, 2.5mm, or 3mm.

[0055] It is understandable that in the power battery, the pressure ring 3 and the pole 2 cooperate with each other, and the structural strength of the pole 2 must also meet the load-bearing requirements. As an example of this embodiment, the diameter D of the pole 2 may satisfy: 10≤D≤30mm. For example, the diameter D of the pole may be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm. One of the sizes is used to facilitate the matching of the pressure ring 3 and the pole 2. In addition, the area S of the front end face of the pole 2 may satisfy: 79≤S≤706mm 2 For example, the area S of the front end surface of the pole 2 can be 79mm 2 , 80mm 2 、81mm 2 、82mm 2 、83mm 2 、84mm 2 、85mm 2 、86mm 2 、87mm 2 、88mm 2 、89mm 2 、90mm 2 、91mm 2 、92mm 2 、93mm 2 、94mm 2 、95mm 2 、96mm 2 、97mm 2 、98mm 2 、99mm 2 , 100mm 2 、101mm 2 、102mm 2 、103mm 2 、104mm2 、105mm 2 、106mm 2 、107mm 2 、108mm 2 、109mm 2 、110mm 2 、111mm 2 、112mm 2 、113mm 2 、114mm 2 、115mm 2 、116mm 2 、117mm 2 、118mm 2 、119mm 2 、120mm 2 、121mm 2 、122mm 2 、123mm 2 、124mm 2 、125mm 2 、126mm 2 、127mm 2 、128mm 2 、129mm 2 、130mm 2 、131mm 2 、132mm 2 、133mm 2 、134mm 2 、135mm 2 、136mm 2 、137mm 2 、138mm 2 、139mm 2 、140mm 2 、141mm 2 、142mm 2 、143mm 2 、144mm 2 、145mm 2 、146mm 2 、147mm 2 、148mm 2 、149mm 2 、150mm 2 、151mm 2 、152mm 2 、153mm 2 、154mm 2 、155mm 2 、156mm 2、157mm 2 、158mm 2 、159mm 2 、160mm 2 、161mm 2 、162mm 2 、163mm 2 、164mm 2 、165mm 2 、166mm 2 、167mm 2 、168mm 2 、169mm 2 、170mm 2 、171mm 2 、172mm 2 、173mm 2 、174mm 2 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[0056] refer to Figure 3 As an example of this embodiment, the cover plate assembly 100 also includes an insulating member 4, which is arranged between the pressure ring 3 and the cover plate 1 to separate the pressure ring 3 from the cover plate 1, and the insulating member 4 has a certain elasticity, and its elastic modulus is E, and the elastic modulus E satisfies: 1≤E≤20GPa, so that the insulating member 4 can buffer the cover plate 1 to prevent the pressure ring 3 from directly squeezing the cover plate 1, causing the cover plate 1 to deform, and affecting the assembly effect of the cover plate assembly 100.

[0057] refer to Figure 4-Figure 5 As an example of this embodiment, the cover plate 1 includes a supporting portion 10, the rear side of the insulating member 4 is attached to the supporting portion 10, and the front side of the insulating member 4 is attached to the pressure ring 3; and the thickness of the supporting portion 10 is H2, and the thickness H2 of the supporting portion 10 satisfies: 0.5≤H2≤2mm. Exemplarily, the thickness H2 of the supporting portion 10 can be one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2mm.

[0058] The thickness H1 of the pressure ring 3 affects the weight of the pressure ring 3, and the greater the weight of the pressure ring 3, the greater the load on the supporting portion 10 of the cover plate 1. Therefore, in order to ensure that the supporting portion 10 is not easily deformed after being pressed, the thickness of the supporting portion 10 should be adjusted according to the thickness H1 of the pressure ring 3, so that the thickness H1 of the pressure ring 3 and the thickness H2 of the supporting portion 10 can match each other, so that the supporting portion 10 is sufficient to bear the pressure ring 3 and is not easily deformed.

[0059] refer to Figure 7 As an example of this embodiment, the pole 2 includes a main body 20 and a limiting portion 21, wherein the main body 20 is a columnar structure, and the diameter D of the pole 2 is the diameter of the main body 20; the main body 20 is arranged along the front-to-back direction and penetrates the mounting hole 7; the limiting portion 21 is formed at the rear end of the main body 20 and extends toward the outside of the main body 20, and a sealing member 6 is provided between the limiting portion 21 and the cover plate 1.

[0060] It is understandable that after the present cover plate assembly 100 is assembled to the battery and the pole 2 is assembled with the busbar, during the use of the battery, the busbar pulls the front end face of the pole 2, which will apply a pulling force toward the front side to the pole 2, and the pulling force will cause the pole 2 to squeeze the rear end face of the cover plate 1, which is easy to cause the cover plate 1 to deform. Therefore, a seal 6 can be set between the pole 2 and the cover plate 1, so that when the pole 2 is applied with a pulling force toward the front side, the seal 6 is squeezed by the limiter 21, so as to avoid the limiter 21 directly squeezing the cover plate 1, and the seal 6 is used to enhance the sealing between the pole 2 and the cover plate 1. Of course, considering the sealing between the limiter 21 and the seal 6, the seal 6 can be made of elastic material, so that the seal 6 can be elastically deformed when being squeezed by the limiter 21, so that the seal 6 is more in line with the appearance of the limiter 21, and the sealing between the seal 6 and the limiter 21 is ensured.

[0061] refer to Figure 7 As an example of this embodiment, a protrusion 23 is provided on the front end surface of the pole 2 , and the protrusion 23 extends toward the front side along the thickness direction thereof and cooperates with the outer peripheral side of the pole 2 to form a step 8 .

[0062] The raised portion 23 is raised from the front end surface of the pole 2 and can be used as a welding area between the pole 2 and the busbar. In this way, when the pole 2 is pulled by the busbar, the pulling force applied by the busbar to the pole 2 directly acts on the pole 2 itself through the raised portion 23, and will not affect the weld mark 5 between the pressure ring 3 and the pole 2. Moreover, when the interaction force is generated between the pressure ring 3 and the pole 2, the interaction force between the pressure ring 3 and the pole 2 will not be transmitted to the raised portion 23, and will not affect the connection between the pole 2 and the busbar, effectively avoiding the problem that the busbar and the pressure ring 3 affect each other and cause the connection failure between the two.

[0063] Of course, the protrusion 23 provided on the front end face of the pole 2 will also occupy a certain amount of battery pack space, so the thickness H3 of the protrusion 23 needs to be configured within a suitable range to avoid the protrusion 23 being too thick and excessively occupying the battery pack space, reducing the space utilization of the battery pack, or avoiding the protrusion 23 being too thick and unable to effectively separate the busbar and the pressure ring 3. As an example of this embodiment, the thickness H3 of the protrusion 23 may satisfy: 0.2≤H3≤1mm. Exemplarily, the thickness H3 of the protrusion 23 may be one of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1mm.

[0064] refer to Figure 4 As another example of this embodiment, the rear end face of the pole 2 is recessed toward the front side along the thickness direction thereof to form a recessed portion 22, which reduces the weight of the pole 2, so that the pressure ring 3 of the same specification can carry a larger pole 2. In this way, the volume of the pressure ring 2 can be reduced by adjusting the width W of the pressure ring 2, thereby appropriately increasing the area S of the front end face of the pole 2 and increasing the flow area of ​​the battery.

[0065] When the weight of the pole 2 is reduced, the force of the pole 2 on the weld mark 5 will also be reduced accordingly. Therefore, the thickness H1 of the pressure ring 2 can be adjusted to appropriately reduce the thickness H1 of the pressure ring 2, thereby reducing the volume of the pressure ring 2. As an example of this embodiment, the thickness of the pressure ring is H1, and the area of ​​the front end surface of the pole is S, which can satisfy:

[0066]

[0067] Of course, the recessed portion 22 is also related to the size of the pole 2 itself, affecting the structural stability of the pole 2. Therefore, the depth of the recessed portion 22 should be considered to be maintained within an appropriate range to avoid the weight change of the pole 2 being not obvious due to the size of the recessed portion 22 being too small, or to avoid the structural strength of the pole 2 being weakened due to the size of the recessed portion 22 being too large. For example, as an example of this embodiment, the depth H4 of the recessed portion 22 can satisfy: 1≤H4≤4mm. Exemplarily, the depth H4 of the recessed portion 22 can be one of 1mm, 2mm, 3mm, and 4mm.

[0068] In summary, the cover plate assembly 100 provided in the present embodiment controls the width W of the pressure ring 3 and the diameter D of the pole 2 within a suitable range, so that when the pole 2 and the pressure ring 3 are welded and fixed, the pressure ring 3 can provide a sufficient welding area, so that the weld mark 5 can reach a sufficient connection width to ensure that the pole 2 and the pressure ring 3 are firmly connected. In addition, the cover plate assembly 100 of the present embodiment controls the thickness H1 of the pressure ring 3 and the area S of the front end surface of the pole 2 within a suitable range, so that the weld mark 5 can reach a sufficient connection depth, and further improves the connection force of the weld mark 5, so that even when the cover plate assembly 100 is equipped with a bus, the welding structure between the pole 2 and the pressure ring 3 has sufficient connection strength and connection quality, effectively avoiding the problem of welding failure between the pole 2 and the pressure ring 3.

[0069] Moreover, the cover plate assembly 100 of this embodiment reduces the weight of the pole 2 by providing a recessed portion 22 on the pole 2, thereby reducing the traction force of the pole 2 on the weld mark 5, so that the area of ​​the pressure ring 3 can be further reduced, and the area of ​​the pole 2 can be further expanded, thereby increasing the current flow area of ​​the battery.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, wherein the cover plate is provided with mounting holes that penetrate the cover plate from front to back along the thickness direction thereof; A pole, the pole being passed through the mounting hole; A pressure ring, which is arranged on the front side of the cover plate and sleeved on the pole, and the pressure ring is fixed to the outer peripheral side of the pole by welding; The width of the pressure ring is W, the thickness of the pressure ring is H1, the diameter of the pole is D, the area of ​​the front end surface of the pole is S, and the above parameters satisfy: The area S of the front end face of the pole is the area of ​​the end face corresponding to the diameter D of the pole, and the width W of the pressure ring is the shortest distance from the inner edge to the outer edge of the pressure ring.

2. The cover plate assembly according to claim 1, characterized in that: The width W of the pressure ring satisfies: 2≤W≤4mm, and the diameter D of the pole satisfies: 10≤D≤30mm.

3. The cover plate assembly according to claim 1, characterized in that: The thickness H1 of the pressure ring satisfies: 1.5≤H1≤3mm, and the area S of the front end surface of the pole satisfies: 79≤S≤706mm 2 .

4. The cover plate assembly according to claim 1, characterized in that: The outer contour of the pressing ring is circular or polygonal.

5. The cover plate assembly according to claim 1, characterized in that: It also includes an insulating member, which is disposed between the pressure ring and the cover plate to separate the pressure ring from the cover plate; and The elastic modulus of the insulating member is E, and the elastic modulus E satisfies: 1≤E≤20GPa.

6. The cover plate assembly according to claim 5, characterized in that: The cover plate includes a supporting portion, the rear side of the insulating member is attached to the supporting portion, and the front side of the insulating member is attached to the pressure ring; and, The thickness of the supporting portion is H2, and the thickness H2 of the supporting portion satisfies: 0.5≤H2≤2mm.

7. The cover plate assembly according to claim 1, characterized in that: The pole comprises: A main body portion, the main body portion is arranged along the front-to-back direction and penetrates the mounting hole; A limiting portion, the limiting portion is formed at the rear end of the main body and extends toward the outside of the main body, and A sealing member is arranged between the limiting portion and the cover plate.

8. The cover plate assembly according to claim 1, characterized in that: A protrusion is provided on the front end surface of the pole, and the protrusion extends toward the front side along the thickness direction thereof and cooperates with the outer peripheral side of the pole to form a step.

9. The cover plate assembly according to claim 8, characterized in that: The thickness of the raised portion is H3, and the thickness H3 of the raised portion satisfies: 0.2≤H3≤1 mm.

10. The cover plate assembly according to claim 1, characterized in that: The rear end surface of the pole is recessed toward the front side along the thickness direction thereof to form a recessed portion.

11. The cover plate assembly according to claim 10, characterized in that: The area of ​​the front end surface of the pole is S, and the above parameters satisfy:

12. The cover plate assembly according to claim 10, characterized in that: The depth of the recessed portion is H4, and the depth H4 of the recessed portion satisfies: 1≤H4≤4mm.

13. A battery, characterized in that: It comprises a pole ear and a cover plate assembly as described in any one of claims 1-12.

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