Battery top cover and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a single battery. The battery top cover comprises a cover plate body and at least one electrode assembly, each electrode assembly comprises a pole and a sealing piece, the cover plate body is provided with a mounting hole, the pole penetrates through the mounting hole and is insulated from the battery top cover, the sealing piece is arranged between the pole and the cover plate body, and a pre-deformation part is formed on the periphery of the mounting hole of the cover plate body. The bottom face of the pre-deformation part is provided with an inclined face tilting by a preset angle towards the top. According to the battery top cover, the pre-deformation amount can be set in advance to reduce the influence of deformation of the cover plate body, so that the compression ratio of the sealing element meets the requirement, and the sealing property of the battery top cover is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field especially relates to a battery top cover and single cell. BACKGROUND

[0002] In the structure of the battery, the battery top cover as its important parts is usually assembled by the cover plate, the lower plastic, the pole, the upper plastic, the sealing element, the riveting element and the like structure, wherein, the sealing problem of the pole is one of the key problems for guaranteeing the sealing in the battery.

[0003] The sealing of the pole in the existing battery top cover is realized by the assembly compression sealing ring of the cover plate, the pole, the upper plastic and the fixing ring, and the compression ratio of the sealing ring generally needs to be greater than 36% and less than 45% to guarantee that the cover plate sealing ring passes the test. However, in the assembly process, the cover plate may be deformed due to stress, which will affect the compression ratio of the sealing ring, so that it does not meet the above compression ratio, and the compression ratio less than 36% will lead to the decrease of the air tightness and easy leakage, and greater than 45% will lead to the compression too large to reduce the service life of the sealing ring, thereby affecting the long-term stable performance of the product.

[0004] Therefore, an urgent need exists for a battery top cover and single cell to solve the above technical problems. SUMMARY

[0005] One purpose of the utility model is to provide a battery top cover, which can set a pre-deformation in advance to reduce the influence of the deformation of the cover plate body, so that the compression ratio of the sealing element meets the demand, and the air tightness of the battery top cover is improved.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery top cover comprises a cover plate body and at least one electrode assembly, the electrode assembly comprises a pole and a sealing element, the cover plate body is provided with a mounting hole, the pole is arranged in the mounting hole and insulated from the cover plate body, the sealing element is arranged between the pole and the cover plate body, a pre-deformation part is formed on the outer periphery of the mounting hole of the cover plate body, and the bottom surface of the pre-deformation part is provided with an inclined surface which is tilted towards the top by a preset angle.

[0008] Optionally, the preset angle is alpha, and 3°≤alpha≤5°.

[0009] Optionally, the top surface of the pre-deformation part is also provided with a groove, so that a cantilever is formed on the pre-deformation part close to the mounting hole, the sealing element is clamped on the cantilever, and a part of the sealing element is compressed between the groove and the pole, and another part of the sealing element is compressed between the hole wall of the mounting hole and the pole.

[0010] Optionally, the pole includes a body portion and a protruding ring, the protruding ring is arranged on the outer periphery of the body portion, and a part of the sealing member is compressed between the groove and the protruding ring, and another part is compressed between the hole wall of the mounting hole and the outer peripheral wall of the body portion.

[0011] Optionally, the cover plate body is integrally formed by stamping.

[0012] Optionally, the electrode assembly further includes a fixing ring, the fixing ring is sleeved and insulated from the outer periphery of the top end of the pole, so as to fix the top end of the pole to the cover plate body.

[0013] Optionally, the electrode assembly further includes an upper plastic member, the upper plastic member is wrapped on the outer surface of the fixing ring, so as to insulate the top end of the pole and the fixing ring.

[0014] Optionally, a lower plastic member is further included, the lower plastic member is arranged at the bottom of the cover plate body, and a part of the lower plastic member is arranged between the hole wall of the mounting hole and the outer peripheral wall of the pole, so as to insulate the bottom end of the pole and the cover plate body.

[0015] Optionally, one of the lower plastic member and the cover plate body is provided with a protruding portion, and the other is provided with a recess portion corresponding to the protruding portion, and the protruding portion is clamped in the recess portion.

[0016] Another purpose of the utility model is to provide a single battery, which can set a pre-deformation in advance, reduce the influence of deformation of the cover plate body, make the compression ratio of the sealing member meet the demand, and improve the sealing property of the single battery.

[0017] To achieve this purpose, the utility model adopts the following technical scheme:

[0018] The single battery includes the battery top cover of any one of the above-mentioned schemes.

[0019] The utility model has the advantages of:

[0020] The utility model provides a kind of battery top cover and single battery, by being provided with the inclined surface of pre-deformation portion with the preset angle of top in the outer periphery of mounting hole of cover plate body, so that the battery top cover has pre-deformation portion near mounting hole, so that the deformation of mounting hole near battery top cover stamping will not exceed the bottom surface of cover plate body.I.e., when the assembly of sealing member is carried out, pre-compression effect is played to sealing member first, then the pre-deformation portion is flattened by the pre-deformation portion stress in the process of electrode assembly and cover plate body fixation, so that the situation that the compression ratio of sealing member after installation exceeds reasonable range is avoided, the sealing property and sealing durability of the battery top cover are improved, and then the sealing property and service life of single battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a top view of the battery top cover provided by the embodiment of the utility model;

[0022] Figure 2 is Figure 1 is a sectional view at A-A in the middle;

[0023] Figure 3 is Figure 2 is an enlarged view of part B in the middle.

[0024] in the figure:

[0025] 10, cover plate body; 101, mounting hole; 102, pre-deformation part; 1021, groove; 1022, cantilever; 103, recess;

[0026] 20, pole; 21, body part; 22, convex ring;

[0027] 30, sealing element; 40, fixing ring; 50, upper plastic element;

[0028] 60, lower plastic element; 61, protruding part. Embodiment

[0029] The utility model will be further explained in detail in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model and not to limit the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings and not all the structures.

[0030] In the description of the utility model, unless there is explicit definition and limitation, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or be integrated, can be directly connected, also can be indirectly connected through intermediate medium, can be the communication of two elements or the interaction of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature, can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that first feature is higher than second feature in horizontal height.First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that first feature is lower than second feature in horizontal height.

[0032] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0033] Reference will now be made to Figures 1 to 3 The utility model provides a battery top cover and single cell battery.

[0034] The utility model provides a kind of battery top cover, which is used for the function of shell sealing, liquid injection and external electrical connection of single cell battery.

[0035] Please refer to Figures 1 to 3 Specifically, the battery top cover includes a cover plate body 10 and at least one electrode assembly, the electrode assembly includes a post 20 and a sealing element 30, the cover plate body 10 is provided with a mounting hole 101, the post 20 is arranged in the mounting hole 101 and insulated from the cover plate body 10, the sealing element 30 is arranged between the post 20 and the cover plate body 10, the outer periphery of the cover plate body 10 located in the mounting hole 101 forms a pre-deformation part 102, and the bottom surface of the pre-deformation part 102 is provided with an inclined surface tilted towards the top by a preset angle.

[0036] The battery top cover in the embodiment has the pre-deformation part 102 with the inclined surface on the bottom surface of the cover plate body 10 near the mounting hole 101, so that the deformation of the battery top cover near the mounting hole 101 does not exceed the bottom surface of the cover plate body 10 when the battery top cover is punched. That is, when the sealing member 30 is assembled, the sealing member 30 is pre-compressed, and then the pre-deformation part 102 is flattened during the fixing of the electrode assembly and the cover plate body 10, so that the compression ratio of the sealing member 30 after installation does not exceed the reasonable range, and the sealing property and the sealing durability of the battery top cover are improved.

[0037] Optionally, the electrode assembly is one or two, which is changed according to the design requirements of the single battery, and is not limited here.

[0038] Please refer to Figures 1 to 3 In the embodiment, the cover plate body 10 is integrally punched and formed, so that the pre-deformation part 102, the mounting hole 101 and other structures are integrally formed, which is convenient and fast.

[0039] Optionally, the preset angle is α, and 3°≤α≤5°. In this way, the pre-compression of the sealing member 30 can be realized, and the sealing member 30 is not over-compressed, so that the compression ratio of the sealing member 30 is 36%-45%.

[0040] Further, the top surface of the pre-deformation part 102 is also provided with the groove 1021, so that the pre-deformation part 102 forms the cantilever 1022 near the mounting hole 101, the sealing member 30 is clamped on the cantilever 1022, and a part of the sealing member 30 is compressed between the groove 1021 and the pole column 20, and another part of the sealing member 30 is compressed between the hole wall of the mounting hole 101 and the pole column 20. In this way, the contact area between the sealing member 30 and the cover plate body 10 is improved, so that the sealing area is improved, and double-layer sealing between the outer periphery of the pole column 20 and the cover plate body 10 is formed, so that the sealing effect of the sealing member 30 is greatly improved.

[0041] Specifically, the pole column 20 includes the body part 21 and the convex ring 22, the convex ring 22 is arranged on the outer periphery of the body part 21, a part of the sealing member 30 is compressed between the groove 1021 and the convex ring 22, and another part of the sealing member 30 is compressed between the hole wall of the mounting hole 101 and the outer peripheral wall of the body part 21, so that the sealing member 30 and the pole column 20 are multi-layer sealed.

[0042] Please refer to Figure 2 and Figure 3In the embodiment, the electrode assembly further comprises a fixing ring 40, which is sleeved and insulated on the outer periphery of the top end of the pole 20 to fix the top end of the pole 20 to the cover body 10, thereby fixing the pole 20. Specifically, the bottom of the convex ring 22 of the pole 20 is limitingly connected to the cover body 10, and the top of the convex ring 22 of the pole 20 is limited by the fixing ring 40, thereby limiting the pole 20 in the height direction, and the mounting hole 101 and the sealing member 30 and other structures limit the circumference of the pole 20, thereby fixing the pole 20.

[0043] Further, the electrode assembly further comprises an upper plastic member 50, which is sleeved on the outer surface of the fixing ring 40 to insulate the top end of the pole 20 and the fixing ring 40, so that they are insulated, and the fixing ring 40 is also insulated. Similarly, the upper plastic member 50 also limits the circumference of the pole 20, thereby further improving the fixation of the pole 20.

[0044] Further, the battery top cover further comprises a lower plastic member 60, which is arranged at the bottom of the cover body 10, and part of the lower plastic member 60 is arranged between the hole wall of the mounting hole 101 and the outer peripheral wall of the pole 20, so as to insulate the bottom end of the pole 20 and the cover body 10, and also to insulate the bottom end of the battery top cover and the battery cell in the single battery.

[0045] Optionally, one of the lower plastic member 60 and the cover body 10 is provided with a protruding portion 61, and the other is provided with a recess 103 in one-to-one correspondence, and the protruding portion 61 is clamped in the recess 103, so that the lower plastic member 60 and the cover body 10 are limited, thereby facilitating the connection and assembly of the two.

[0046] In the embodiment, the battery top cover further comprises an explosion-proof structure for installing the explosion-proof pressure relief of the single battery to which the battery top cover is installed.

[0047] Further, the battery top cover further comprises a liquid injection structure for liquid injection of the single battery to which the battery top cover is installed.

[0048] The embodiment also provides a single battery comprising the battery top cover according to any one of the above-mentioned solutions. By adopting the above-mentioned battery top cover, the sealing performance of the single battery is improved, and the effective use time of the sealing member 30 is prolonged, thereby improving the service life of the single battery.

[0049] Specifically, the single battery further comprises a shell and a battery cell, and the battery cell is arranged in the shell, and the shell comprises at least one opening, and the battery top cover is sealingly connected to the opening of the shell, so that the single battery forms a sealed power storage structure.

[0050] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A battery top cover characterized by, The cover plate body (10) is provided with a mounting hole (101), the pole column (20) is arranged in the mounting hole (101) and is insulated from the cover plate body (10), and the sealing element (30) is arranged between the pole column (20) and the cover plate body (10), a pre-deformation portion (102) is formed at the outer periphery of the cover plate body (10) at the mounting hole (101), and the bottom surface of the pre-deformation portion (102) is provided with an inclined surface that is tilted towards the top portion by a preset angle.

2. The battery header of claim 1, wherein, The preset angle is α, and 3°≤α≤5°.

3. The battery header of claim 1, wherein, The top surface of the pre-deformation portion (102) is further provided with a groove (1021), so that a cantilever portion (1022) is formed at the pre-deformation portion (102) close to the mounting hole (101), the sealing element (30) is clamped on the cantilever portion (1022), and a part of the sealing element (30) is compressed between the groove (1021) and the pole column (20), and another part is compressed between the hole wall of the mounting hole (101) and the pole column (20).

4. The battery header of claim 3, wherein, The pole column (20) comprises a body portion (21) and a convex ring (22) arranged at the outer periphery of the body portion (21), a part of the sealing element (30) is compressed between the groove (1021) and the convex ring (22), and another part is compressed between the hole wall of the mounting hole (101) and the outer peripheral wall of the body portion (21).

5. The battery cover of claim 1, wherein, The cover plate body (10) is integrally punched and formed.

6. The battery header of any one of claims 1-5, wherein, The electrode assembly further comprises a fixing ring (40) that is sleeved and insulated on the outer periphery of the top end of the pole column (20) to fix the top end of the pole column (20) to the cover plate body (10).

7. The battery header of claim 6, wherein, The electrode assembly further comprises an upper plastic element (50) that is wrapped on the outer surface of the fixing ring (40) to insulate the top end of the pole column (20) and the fixing ring (40).

8. The battery header of claim 7, wherein, The electrode assembly further comprises a lower plastic element (60) arranged at the bottom of the cover plate body (10), and a part of the lower plastic element (60) is arranged between the hole wall of the mounting hole (101) and the outer peripheral wall of the pole column (20) to insulate the bottom end of the pole column (20) and the cover plate body (10).

9. The battery header of claim 8, wherein, One of the lower plastic element (60) and the cover plate body (10) is provided with a protruding portion (61), and the other is provided with a recess portion (103) corresponding to the protruding portion (61), and the protruding portion (61) is clamped on the recess portion (103).

10. A single cell characterized by The battery top cover comprises the electrode assembly according to any one of claims 1-9.

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