Battery cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a battery cover plate assembly and a battery, the battery cover plate assembly comprises a battery cover plate and a first plastic part, the first plastic part is arranged on one side, close to a pole group, of the battery cover plate, and a second liquid injection hole communicated with a first liquid injection hole of the battery cover plate is formed in the first plastic part; an annular flange is arranged on the end face, close to one side of the pole group, of the first plastic part and located in the circumferential direction of the second liquid injection hole, and a supporting part is arranged on one side, facing the pole group, of the annular flange. Through the supporting effect of the supporting part on the insulated rubber tape, a circulation space can be formed between the insulated rubber tape and the annular flange. The electrolyte can be injected into the shell through the first liquid injection hole, the second liquid injection hole and the circulation space in sequence, so that the second liquid injection hole is prevented from being blocked by an insulating tape, and the liquid injection and the negative pressure formation process of the battery are ensured to be smoothly carried out. The utility model further provides a battery which comprises the battery cover plate assembly.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries, as power batteries, are widely used in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0003] Currently, common lithium-ion batteries generally include a battery cover plate, a lower plastic part, a pole group, a housing, etc. Among them, the pole group is arranged in the housing. After the battery cover plate and the housing are laser welded, a sealed space for protecting the pole group is formed. A bare cell insulating sheet is arranged outside the pole group. The pole tabs of the pole group pass through the bare cell insulating sheet and are connected to the pole posts on the battery cover plate. The lower plastic part is arranged on one side of the battery cover plate and can press the pole group tightly in the housing, so that the pole group is fixed in the housing to avoid internal short circuit caused by the shaking of the pole group. Liquid injection holes are provided on both the battery cover plate and the lower plastic part, and the electrolyte can be injected into the housing through the liquid injection holes, so that the pole group is immersed in the electrolyte.

[0004] However, for some battery cover plate assemblies with smaller sizes or higher integration levels, due to structural design and layout space limitations, the liquid injection holes can only be arranged above the pole tabs. The pole tabs and the pole posts are electrically connected through a connecting piece. To avoid slag falling from the welding mark of the welding between the pole tab and the connecting piece and to avoid lap short circuit between the pole tab and the housing, an insulating tape is wrapped around the welding area between the pole tab and the connecting piece. Refer to Figure 1 , the liquid injection holes 11' on the battery cover plate 10' and the lower plastic part 30' are exactly above the pole tabs 21' of the pole group 20'. During the liquid injection process, the insulating tape wrapped around the pole tabs 21' and the connecting piece may block the liquid injection holes 11', resulting in the electrolyte being unable to enter the housing smoothly and the liquid injection efficiency being reduced. In addition, during the negative pressure formation process of the battery, due to the shielding problem of the insulating tape to the liquid injection holes 11', the internal vacuum pumping operation of the battery cannot be carried out. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery cover plate assembly and a battery, which can support the insulating tape wrapped around the pole tab and the connecting piece, thereby preventing the insulating tape from blocking the liquid injection hole and ensuring the smooth progress of the liquid injection operation and the negative pressure formation process.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] On the one hand, the utility model provides a battery cover plate assembly, including:

[0008] A battery cover plate, provided with a first liquid injection hole;

[0009] A first plastic part is arranged on a side of the battery cover plate close to the electrode group, a second injection hole is arranged on the first plastic part, the second injection hole is communicated with the first injection hole, an annular flange is arranged on the end surface of the first plastic part close to the electrode group, the annular flange is located in the circumference of the second injection hole, and a support portion is arranged on the side of the annular flange facing the electrode group;

[0010] Wherein, along the thickness direction of the battery cover plate, the height of the support portion is A, and the value range of A is 0.5mm≤A≤1.0mm.

[0011] Optionally, a plurality of the support portions are provided, and the plurality of the support portions are evenly spaced and arranged on the annular flange.

[0012] Optionally, the number of the support portions is an even number, the distance between two support portions opposite to each other in the radial direction of the annular flange is B, the size of the support portion in the radial direction of the annular flange is C, and B>A+C;

[0013] Among them, the value range of B is 2.03mm≤B≤5.00mm;

[0014] The value range of C is 1.0mm≤C≤2.0mm.

[0015] Optionally, along the radial direction of the annular flange, the dimension of the annular flange is D, and D≥C.

[0016] Optionally, the support portion is a column, the axial direction of the column is in the same direction as the thickness direction of the battery cover plate, one side of the axial direction of the column is connected to the annular flange, and the other side of the axial direction of the column faces the pole group.

[0017] Optionally, the supporting portion is a hemisphere, a plane of the hemisphere is connected to the annular flange, and an arc surface of the hemisphere faces the pole group.

[0018] Optionally, the diameter of the second injection hole is d, and the machining tolerance of the second injection hole is d1;

[0019] Among them, the value range of d is: 2mm≤d≤4mm;

[0020] The value range of d1 is: -0.03mm≤d1≤0.03mm.

[0021] Optionally, a first arc chamfer is provided on a side of the annular flange away from the second liquid injection hole, and a radius of the first arc chamfer is r1, and a value range of r1 is 0.5 mm ≤ r1 ≤ 1.0 mm.

[0022] Optionally, a second arc chamfer is provided on the inner wall of the end of the second liquid injection hole facing away from the electrode group, and the radius of the second arc chamfer is r2, where the value range of r2 is 0.5 mm ≤ r2 ≤ 1.0 mm.

[0023] On the other hand, the present invention provides a battery, including a housing and the battery cover assembly in any of the above solutions, and the battery cover assembly is connected to the housing.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention provides a battery cover assembly, including a battery cover and a first plastic part. The first plastic part is arranged on the side of the battery cover close to the electrode group. The battery cover is provided with a first liquid injection hole, and the first plastic part is provided with a second liquid injection hole communicating with the first liquid injection hole. An annular flange is provided on the end face of the first plastic part close to the electrode group, and the annular flange is located in the circumferential direction of the second liquid injection hole. One side of the annular flange facing the electrode group has a support part. Due to the support effect of the support part on the insulating tape, a flow space can be formed between the insulating tape and the annular flange. Thus, when injecting liquid into the housing, the electrolyte can sequentially pass through the first liquid injection hole, the second liquid injection hole, and the flow space and be injected into the housing, preventing the insulating tape from blocking the second liquid injection hole and ensuring the smooth progress of the liquid injection and the negative pressure formation process of the battery. Further, in the thickness direction of the battery cover, the height A of the support part ranges from 0.5 mm ≤ A ≤ 1.0 mm, ensuring an effective flow space can be formed between the insulating tape and the annular flange, which helps the electrolyte to flow quickly.

[0026] The present invention also provides a battery, including a housing, an electrode group, and the above battery cover assembly. An opening is provided on one side of the housing, and the electrode group is installed in the housing through the opening. The battery cover assembly is connected to the opening of the housing and encloses a sealed cavity with the housing, and the electrode group is arranged in the sealed cavity. By adopting the above battery cover assembly, the support part on the first plastic part can abut against the insulating tape covering the positive electrode tab or the negative electrode tab, thereby forming a flow space between the annular flange and the insulating tape, ensuring that the electrolyte can smoothly flow into the housing from the first liquid injection hole of the battery cover, the second liquid injection hole of the first plastic part, and the flow space in sequence, preventing the insulating tape from blocking the liquid injection hole, ensuring the smooth progress of the liquid injection operation and the negative pressure formation process, and having a high efficiency in the liquid injection and negative pressure formation processes. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of a battery cover assembly and an electrode group in the prior art;

[0028] Figure 2 is a schematic structural diagram of the battery cover assembly provided in the embodiment of the present invention;

[0029] Figure 3 It is a top view of the battery cover assembly provided in the embodiment of the present utility model;

[0030] Figure 4 is Figure 3 a sectional view of the A-A section in;

[0031] Figure 5 is Figure 4 a partial enlarged view at B in;

[0032] Figure 6 is Figure 4 a partial enlarged view at C in;

[0033] Figure 7 It is a bottom view of the battery cover assembly provided in the embodiment of the present utility model;

[0034] Figure 8 It is a structural schematic diagram of the battery provided in the embodiment of the present utility model.

[0035] In the figure:

[0036] 10’, battery cover; 11’, liquid injection hole; 20’, electrode group; 21’, tab.

[0037] 100, battery cover; 110, first liquid injection hole; 120, first mounting hole; 130, second mounting hole; 140, guiding flange; 200, first plastic part; 210, second liquid injection hole; 220, annular flange; 230, supporting part; 240, pressure relief hole; 300, pole column; 400, second plastic part; 500, seal; 600, explosion-proof valve; 700, housing; 710, blue film; 800, electrode group; 810, tab; 820, connecting piece. Detailed implementation manners

[0038] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings rather than all structures.

[0039] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside 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 utility model can be understood according to specific situations.

[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0041] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left" and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 thus should not be construed as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] As Figures 2 - 5 shown, this embodiment provides a battery cover assembly, which includes a battery cover 100 and a first plastic part 200. The first plastic part 200 is arranged on the side of the battery cover 100 close to the electrode group 800. A first liquid injection hole 110 is provided on the battery cover 100, and a second liquid injection hole 210 is provided on the first plastic part 200. The second liquid injection hole 210 is coaxial with and communicates with the first liquid injection hole 110. An annular flange 220 is provided on the end surface of the first plastic part 200 on the side close to the electrode group 800. The annular flange 220 is located in the circumferential direction of the second liquid injection hole 210, and a support portion 230 is provided on the side of the annular flange 220 facing the electrode group 800.

[0043] The electrode group 800 includes tab 810 and connecting piece 820. Two ends of the connecting piece 820 are respectively welded to the tab 810 and the terminal 300. The terminal 300 passes through the battery cover plate 100 and the first plastic part 200. An insulating tape is coated on the outer side of the welding area between the tab 810 and the connecting piece 820. The insulating tape can prevent slag from falling off the welding mark of the welding between the tab 810 and the connecting piece 820, and prevent the tab 810 from overlapping and short-circuiting with the housing 700, with good safety. The supporting part 230 is used to abut against the insulating tape. Due to the supporting effect of the supporting part 230 on the insulating tape, a circulation space can be formed between the insulating tape and the annular flange 220. Thus, when injecting liquid into the housing 700, the electrolyte can sequentially pass through the first liquid injection hole 110, the second liquid injection hole 210 and the circulation space and be injected into the housing 700, and the electrode group 800 is immersed in the electrolyte. And even if the insulating tape approaches the second liquid injection hole 210 on the first plastic part 200, the supporting effect of the supporting part 230 on the insulating tape can ensure that the circulation space always exists, so that the electrolyte can be smoothly injected into the housing 700. In addition, by supporting the insulating tape through the supporting part 230, the negative pressure formation process of the battery can also be ensured to proceed smoothly.

[0044] Further, along the thickness direction of the battery cover plate 100, that is Figure 2 and Figure 4 the Z-axis direction shown in, the height of the supporting part 230 is A, and the value range of A is 0.5 mm ≤ A ≤ 1.0 mm. Exemplarily, the value of A can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1.0 mm. By setting the value of A within the above range, it is to ensure that an effective circulation space can be formed between the insulating tape and the annular flange 220. If the value of A is set too small, the supporting part 230 cannot play a good supporting role on the insulating tape, and the circulation space between the insulating tape and the annular flange 220 is too small, which is not conducive to the circulation of the electrolyte; if the value of A is set too large, it will waste the space in the height direction of the battery cover plate assembly, with low space utilization rate and not conducive to improving the energy density of the battery.

[0045] See Figure 5 and Figure 7 In this embodiment, a plurality of supporting parts 230 are provided, and the plurality of supporting parts 230 are evenly spaced on the annular flange 220. For example, the supporting part 230 can be set to two, three, four, five, six, etc., which will not be listed one by one here. By providing a plurality of supporting parts 230, the uniformity of supporting the insulating tape can be improved, and the supporting effect is better. And in the circumferential direction of the second liquid injection hole 210, the plurality of supporting parts 230 can all support the insulating tape, so that a plurality of circulation spaces are evenly spaced in the circumferential direction of the second liquid injection hole 210, making the circulation of the electrolyte smoother.

[0046] As an alternative solution, in this embodiment, it is exemplified by taking the number of the supporting portions 230 as four. The number of the supporting portions 230 is an even number, the distance between two opposite supporting portions 230 in the radial direction of the annular flange 220 is B, the dimension of the supporting portion 230 in the radial direction of the annular flange 220 is C, and the radial direction of the annular flange 220 is Figure 7 the X-axis direction shown in Figure 7 . Among them, B > A + C, the value range of B is 2.03 mm ≤ B ≤ 5.00 mm, and the value range of C is 1.0 mm ≤ C ≤ 2.0 mm. Exemplarily, the value of B can be 2.03 mm, 3.03 mm, 3.50 mm, 4.00 mm, 4.50 mm or 5.00 mm. The value of C can be 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2.0 mm.

[0047] In this embodiment, the diameter of the second liquid injection hole 210 is d, and the machining tolerance of the second liquid injection hole 210 is d1. The value range of d is 2 mm ≤ d ≤ 4 mm; the value range of d1 is -0.03 mm ≤ d1 ≤ 0.03 mm.

[0048] When the value of d is 2 mm, by setting the value of B to be greater than 2.03 mm, it can be ensured that when the machining tolerance d1 is the largest, B ≥ d + d1, so that the liquid injection plug can be smoothly inserted into the second liquid injection hole 210, and at the same time, the sealing effect of the second liquid injection hole 210 is good. Of course, the value of B should not be too large, otherwise it will waste the circumferential space of the second liquid injection hole 210 and may also interfere with other structural components of the battery cover assembly.

[0049] In other embodiments, when the value of d is 3 mm, the value of B can be set to 3.03 mm, which can ensure that when the machining tolerance d1 is the largest, B ≥ d + d1, so that the liquid injection plug can be smoothly inserted into the second liquid injection hole 210, and at the same time, the sealing effect of the second liquid injection hole 210 is good.

[0050] Furthermore, by setting the value of C to be greater than 1.0 mm, it is to increase the contact area between the supporting portion 230 and the insulating tape, so that the supporting portion 230 can play a good supporting role on the insulating tape and prevent the insulating tape from adhering to the annular flange 220; similarly, the value of C should not be too large, otherwise it will waste the circumferential space of the second liquid injection hole 210 and may also interfere with other structural components of the battery cover assembly.

[0051] It should be noted that in the radial direction of the annular flange 220 ( Figure 7The X-axis direction and the Y-axis direction shown in the figure are both the radial directions of the annular flange 220. The size of the annular flange 220 is D, and D≥C. Exemplarily, the value range of D is 2.0mm≤D≤4.0mm. For example, the value of D can be 2.0mm, 2.5mm, 3.0mm, 3.5mm or 4.0mm. Thus, the support portion 230 can be completely located on the end surface of the annular flange 220 close to the pole group 800, and the fixing effect of the support portion 230 is good, with high structural strength and good stability. Optionally, in this embodiment, along the radial direction of the annular flange 220, the inner edge of the support portion 230 is flush with the inner edge of the annular flange 220, so as to ensure that the contact point between the support portion 230 and the insulating tape is located at a position close to the second liquid injection hole 210, thereby maximizing the flow space formed between the insulating tape and the annular flange 220 as much as possible and ensuring the smooth flow of the electrolyte.

[0052] Continue to refer to Figure 5 In this embodiment, the support portion 230 is provided as a hemisphere, and the diameter of the hemisphere is C. The hemisphere includes a plane and a curved surface. The plane of the hemisphere is connected to the end surface of the annular flange 220 close to the pole group 800, and the curved surface of the hemisphere faces the pole group 800. By abutting against the insulating tape through the curved surface of the hemisphere, it is avoided that the support portion 230 punctures or damages the insulating tape.

[0053] Of course, in some embodiments, the support portion 230 can also be provided as a cylinder. The axial direction of the cylinder is the same as the thickness direction of the battery cover 100. One side in the axial direction of the cylinder is connected to the annular flange 220, and the other side in the axial direction of the cylinder faces the pole group 800. Optionally, the support portion 230 can be a cylinder with a circular cross-section, that is, the support portion 230 is a cylinder, and the diameter of the cylinder is C. And more preferably, the end of the cylinder close to the pole group 800 can be provided with an arc-shaped structure to avoid damaging the insulating tape. Or, in other embodiments, the cross-section of the support portion 230 can also be set to other shapes.

[0054] Further, a first arc-shaped chamfer is provided on the side of the annular flange 220 facing away from the second liquid injection hole 210. The two ends of the first arc-shaped chamfer are respectively connected to the support portion 230 and the outer peripheral side wall of the annular flange 220. The radius of the first arc-shaped chamfer is r1, and the value range of r1 is 0.5mm≤r1≤1.0mm. For example, the value of r1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm. By providing the first arc-shaped chamfer, it can be ensured that the annular flange 220 will not damage the insulating tape when contacting the insulating tape, and at the same time, it is also beneficial to the demolding of the first plastic part 200.

[0055] Optionally, a second arc chamfer is provided on the inner wall of the second liquid injection hole 210 at the end away from the electrode group 800. The two ends of the second arc chamfer are respectively connected to the end face of the first plastic part 200 close to the battery cover plate 100 and the inner wall of the second liquid injection hole 210. The radius of the second arc chamfer is r2, and the value range of r2 is 0.5 mm ≤ r2 ≤ 1.0 mm. For example, the value of r2 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1.0 mm. By providing the second arc chamfer, when the battery cover plate 100 and the first plastic part 200 are assembled, it can play a guiding role for the battery cover plate 100. Specifically, a guiding flange 140 is provided on the side of the battery cover plate 100 facing the electrode group 800. Through the cooperation of the guiding flange 140 and the second arc chamfer, the guiding flange 140 can be smoothly inserted into the second liquid injection hole 210 of the first plastic part 200. At the same time, the coaxiality between the first liquid injection hole 110 and the second liquid injection hole 210 is ensured, ensuring accurate positioning between the battery cover plate 100 and the first plastic part 200, and being beneficial to the demolding of the first plastic part 200.

[0056] Continue to refer to Figure 2 and Figure 6 and Figure 7 In this embodiment, the battery cover plate assembly includes a pole post 300, a second plastic part 400, and a seal 500. Among them, two first mounting holes 120 are provided at both ends of the battery cover plate 100 in the length direction. There are two pole posts 300, and the two pole posts 300 are respectively a positive pole post and a negative pole post. The positive pole post and the negative pole post are respectively inserted into one first mounting hole 120. Two pole tabs 810 are provided on the side of the electrode group 800 facing the battery cover plate 100. The two pole tabs 810 are respectively a positive pole tab and a negative pole tab. The positive pole tab is electrically connected to the end of the positive pole post close to the electrode group 800, and the negative pole tab is electrically connected to the end of the negative pole post close to the electrode group 800 through a connecting piece 820. The outside of the welding area between the positive pole tab and the connecting piece 820 connected thereto, and the outside of the welding area between the negative pole tab and the connecting piece 820 connected thereto are both covered with insulating tape. The other ends of the positive pole post and the negative pole post pass through the first plastic part 200, the first mounting hole 120 and the second plastic part 400 and are riveted to the second plastic part 400. The seal 500 is sleeved on the pole post 300, and the seal 500 is clamped between the first mounting hole 120 of the battery cover plate 100 and the pole post 300. Through the seal 500, the gap between the pole post 300 and the first mounting hole 120 can be sealed to ensure the sealing performance of the battery cover plate assembly.

[0057] In addition, the battery cover plate assembly includes a liquid injection plug (not shown in the figure). After the liquid injection is completed, it is necessary to insert the liquid injection plug into the first liquid injection hole 110 and the second liquid injection hole 210 to ensure the good sealing of the first liquid injection hole 110 and the second liquid injection hole 210, avoid the leakage of the electrolyte, and ensure the sealing performance of the battery cover plate assembly.

[0058] See Figure 4 and Figure 7 Figure 7 , the battery cover assembly further includes an explosion-proof valve 600. Among them, a second mounting hole 130 is provided at the middle position in the length direction of the battery cover 100, the explosion-proof valve 600 is disposed in the second mounting hole 130, a pressure relief hole 240 is provided on the first plastic part 200, and along the thickness direction of the battery cover 100, the projection of the pressure relief hole 240 on the battery cover 100 coincides with the projection of the explosion-proof valve 600 on the battery cover 100. When the pressure on the side of the battery cover 100 close to the electrode group 800 exceeds the opening pressure of the explosion-proof valve 600, the high-temperature and high-pressure gas will flush open the explosion-proof valve 600 after passing through the pressure relief hole 240, so as to achieve pressure relief, ensure the safety of the battery, and avoid dangers such as fire and explosion.

[0059] This embodiment further provides a battery. See Figure 8 Figure 8 , including a housing 700, an electrode group 800, and the above-mentioned battery cover assembly. An opening is provided on one side of the housing 700, the electrode group 800 is installed in the housing 700 through the opening, the battery cover assembly is connected to the opening of the housing 700 and encloses a sealed cavity with the housing 700, and the electrode group 800 is disposed in the sealed cavity. The positive electrode tab and the negative electrode tab of the electrode group 800 are respectively connected to the positive electrode post and the negative electrode post on the battery cover 100. Along the thickness direction of the battery cover 100, the projection of one of the positive electrode tab or the negative electrode tab on the battery cover 100 coincides with the projection of the second liquid injection hole 210 on the battery cover 100.

[0060] By adopting the above-mentioned battery cover assembly, the supporting portion 230 on the first plastic part 200 can abut against the insulating tape covering the positive electrode tab or the negative electrode tab, so as to form a circulation space between the annular flange 220 of the first plastic part 200 and the insulating tape, ensuring that the electrolyte can flow smoothly into the housing 700 from the first liquid injection hole 110 of the battery cover 100, the second liquid injection hole 210 of the first plastic part 200, and the circulation space in sequence, and submerging the electrode group 800 in the electrolyte, avoiding the insulating tape from blocking the liquid injection hole, ensuring that the liquid injection operation and the negative pressure formation process can proceed smoothly, and the efficiency of the liquid injection and negative pressure formation processes is relatively high.

[0061] Furthermore, a blue film 710 is also provided outside the housing 700, and the blue film 710 can play a certain protective role for the housing 700 to protect the housing 700 from being damaged.

[0062] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A battery cover assembly, characterized in that, include: The battery cover is provided with a first liquid injection hole; A first plastic part is arranged on a side of the battery cover plate close to the electrode group, a second injection hole is arranged on the first plastic part, the second injection hole is communicated with the first injection hole, an annular flange is arranged on the end surface of the first plastic part close to the electrode group, the annular flange is located in the circumference of the second injection hole, and a support portion is arranged on the side of the annular flange facing the electrode group; Wherein, along the thickness direction of the battery cover plate, the height of the support portion is A, and the value range of A is 0.5mm≤A≤1.0mm.

2. The battery cover plate assembly according to claim 1, wherein, A plurality of the support parts are provided, and the plurality of the support parts are evenly spaced and arranged on the annular flange.

3. The battery cover plate assembly according to claim 2, characterized in that, The number of the support parts is an even number, the distance between two support parts opposite to each other in the radial direction of the annular flange is B, the size of the support part in the radial direction of the annular flange is C, and B>A+C; Among them, the value range of B is 2.03≤B≤5.00mm; The value range of C is 1.0mm≤C≤2.0mm.

4. The battery cover plate assembly according to claim 3, wherein, Along the radial direction of the annular flange, the dimension of the annular flange is D, and D≥C.

5. The battery cover plate assembly according to claim 2, characterized in that The support portion is a column, the axial direction of the column is in the same direction as the thickness direction of the battery cover plate, one side of the axial direction of the column is connected to the annular flange, and the other side of the axial direction of the column faces the pole group.

6. The battery cover plate assembly according to claim 2, wherein The support portion is a hemisphere, the plane of the hemisphere is connected to the annular flange, and the arc surface of the hemisphere is arranged toward the pole group.

7. The battery cover assembly according to claim 1, wherein The diameter of the second injection hole is d, and the machining tolerance of the second injection hole is d1; Among them, the value range of d is: 2mm≤d≤4mm; The value range of d1 is: -0.03mm≤d1≤0.03mm.

8. The battery cover plate assembly according to claim 1, characterized in that, A first arc chamfer is provided on a side of the annular flange away from the second liquid injection hole. The radius of the first arc chamfer is r1, and the value range of r1 is 0.5mm≤r1≤1.0mm.

9. The battery cover plate assembly according to claim 1, characterized in that, A second arc chamfer is provided on the inner wall of the second liquid injection hole at one end away from the electrode group, and the radius of the second arc chamfer is r2, and the value range of r2 is 0.5mm≤r2≤1.0mm.

10. A battery, characterized in that, It comprises a shell, and the battery cover assembly according to any one of claims 1 to 9, wherein the battery cover assembly is connected to the shell.

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