Battery cover plate assembly and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate assembly and a single battery. The battery cover plate assembly comprises a cover plate body, the cover plate body comprises a first end face and a second end face which are oppositely arranged, the peripheral wall of the cover plate body is provided with an annular boss protruding out of the first end face in the height direction of the annular boss, and the annular boss is used for being welded to a shell of a battery; the cover plate body is further provided with an anti-explosion hole, the anti-explosion hole is used for installing an anti-explosion valve, and the second end face is provided with at least one first step groove surrounding the anti-explosion hole. According to the battery cover plate assembly, the self weight can be reduced, and the self planeness is ensured, so that the energy density of a single battery provided with the battery cover plate assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery cover plate subassembly and monomer battery. BACKGROUND

[0002] With the continuous development of new energy technology, monomer battery also develops towards high capacity and light weight. Therefore, how monomer battery gradually develops towards high energy density is also one of the directions of continuous improvement in the field.

[0003] In the prior art, the monomer battery comprises a shell, a battery cell and a monomer battery cover plate subassembly. The battery cover plate subassembly comprises a cover plate body, a lower plastic and an electrode assembly. The weight of the cover plate body accounts for about 50% of the total weight of the battery cover plate subassembly. Therefore, thinning the cover plate body will greatly reduce the weight of the battery cover plate subassembly. However, thinning the cover plate body will reduce the structural strength of the battery cover plate subassembly, which may not meet the design and welding requirements, thereby reducing the anti-impact ability of the battery cover plate subassembly, making the battery cover plate subassembly prone to damage and causing safety failure of the monomer battery, and there is also a problem of welding deformation between the cover plate body and the explosion-proof valve.

[0004] Therefore, there is an urgent need for a battery cover plate subassembly and a monomer battery to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] One purpose of the utility model is to provide a battery cover plate subassembly that can reduce its own weight and ensure its flatness, thereby increasing the energy density of the monomer battery on which the battery cover plate subassembly is installed.

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

[0007] The battery cover plate subassembly comprises a cover plate body, the cover plate body comprises oppositely arranged first and second end faces, the outer peripheral wall of the cover plate body is provided with an annular boss protruding from the first end face in the height direction of the cover plate body, the annular boss is used for welding with the shell of the battery, the cover plate body is also provided with an explosion-proof hole for installing an explosion-proof valve, and the second end face is provided with at least one first stepped groove surrounding the explosion-proof hole.

[0008] Optionally, the height of the first stepped groove is not less than 0.5 mm.

[0009] Optionally, the thickness of the cover plate body is W, and 1.5 mm≤W≤1.8 mm.

[0010] Optionally, the cover plate body is also provided with a plurality of reinforcing ribs for enhancing the structural strength of the cover plate body.

[0011] Optionally, the cover plate body is further provided with an electrode hole for mounting an electrode assembly, and the second end face is further provided with a second stepped groove surrounding the electrode hole.

[0012] Optionally, the battery cover plate assembly further comprises a lower plastic part arranged on one side of the cover plate body, wherein the lower plastic part is provided with a protruding part arranged in cooperation with the second stepped groove.

[0013] Optionally, the battery cover plate assembly further comprises an electrode assembly, one end of the electrode assembly is arranged in insulation on the first end face, and the other end is sequentially sealed and arranged in the cover plate body and the lower plastic part and is in position-limiting connection with the lower plastic part.

[0014] Optionally, the electrode assembly comprises a pole, and the pole is provided with a weight-reducing groove.

[0015] Optionally, the cover plate body is further provided with a liquid injection hole, the first end face is provided with a boss, and the liquid injection hole is arranged at the boss.

[0016] Another purpose of the utility model is to provide a single battery comprising the battery cover plate assembly of any of the above-mentioned schemes, which can reduce the weight of the battery cover plate assembly and improve the energy density of the single battery.

[0017] The utility model discloses the beneficial effects of:

[0018] The utility model provides a kind of battery cover plate assembly and single battery, by setting annular boss, the structural strength of this cover plate body is increased, so that this cover plate body can be appropriately thinned while meeting the strength demand.And, first stepped groove is provided with in the outer periphery of explosion vent, so that the position of explosion vent is further thinned setting, not only can reduce the weight of the battery cover plate assembly, also make the deformation amount of cover plate body in the periphery of explosion vent caused by explosion vent welding explosion valve reduces, i.e. the deformation condition still exists when welding in the explosion vent connecting place of cover plate body close to first end face, the explosion vent connecting place close to second end face will not occur larger deformation due to the setting of first stepped groove, avoid explosion valve and the deformation of the whole connection of cover plate body after explosion valve welding and cause the damage of battery cover plate assembly.Meanwhile, the region of small deformation of the explosion valve of this cover plate body installation is also given to the region of large deformation certain reaction force, so as to weaken the deformation amount when explosion valve and explosion vent are installed and welded, further so that the battery cover plate assembly can be further thinned setting, and the flatness of the battery cover plate assembly is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the isometric view of battery cover plate assembly from the perspective of the specific embodiment of the utility model;

[0020] Fig. 2 is an exploded view of the battery cover plate assembly from one perspective provided by the embodiment of the present utility model;

[0021] Fig. 3 is an isometric view of the cover plate body from another perspective provided by the embodiment of the present utility model.

[0022] In the drawings:

[0023] 10, cover plate body; 101, first end face; 102, second end face; 11, annular boss; 12, explosion-proof hole; 13, first stepped groove; 14, electrode hole; 15, second stepped groove; 16, liquid injection hole; 17, boss;

[0024] 20, lower plastic part; 21, protruding part;

[0025] 30, electrode assembly; 31, pole; 311, weight-reducing groove; 32, upper plastic part; 33, sealing part; 34, riveting block;

[0026] 40, explosion-proof valve. EMBODIMENT

[0027] The present utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, and not to limit the present utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present utility model are shown in the drawings, not all the structures.

[0028] In the description of the present utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present utility model can be understood according to the specific circumstances.

[0029] In the present utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and inclined upward of the first feature above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical and inclined downward of the first feature below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0030] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements 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" and "second" are only used to distinguish in the description and have no special meaning.

[0031] Reference will now be made to Figs. 1 to 3 The utility model provides a battery cover plate assembly and single battery.

[0032] The present embodiment provides a battery cover plate assembly which is installed on the shell of a single battery to seal the single battery and conduct electricity externally.

[0033] Please refer to Fig. 1 , Fig. 2 and Fig. 3 , Specifically, the battery cover plate assembly comprises a cover plate body 10, the cover plate body 10 comprises a first end face 101 and a second end face 102 arranged oppositely, an outer peripheral wall of the cover plate body 10 is provided with an annular boss 11 which protrudes from the first end face 101 in the height direction of the cover plate body 10, the annular boss 11 is used for welding with the shell of the battery; the cover plate body 10 is also provided with an explosion-proof hole 12 for installing an explosion-proof valve 40, and the second end face 102 is provided with at least one first stepped groove 13 surrounding the explosion-proof hole 12.

[0034] The battery cover plate assembly in the present embodiment, by setting the annular boss 11, increases the structural strength of the cover plate body 10, so that the cover plate body 10 can be appropriately thinned while meeting the strength requirement. Furthermore, the first stepped groove 13 is provided on the outer periphery of the explosion-proof hole 12, so that the position of the explosion-proof hole 12 is further thinned, which not only reduces the weight of the battery cover plate assembly, but also reduces the deformation amount of the cover plate body 10 around the explosion-proof hole 12 caused by welding the explosion-proof valve 40, that is, the deformation still exists at the connection between the explosion-proof hole 12 close to the first end face 101 and the cover plate body 10 during welding, and the connection between the explosion-proof hole 12 close to the second end face 102 will not deform greatly due to the setting of the first stepped groove 13, avoiding the overall deformation of the connection between the explosion-proof valve 40 and the cover plate body 10 after welding the explosion-proof valve 40, which causes damage to the battery cover plate assembly. At the same time, the small deformation area of the cover plate body 10 where the explosion-proof valve 40 is installed also provides a certain reaction force to the large deformation area, thereby reducing the deformation amount of the explosion-proof valve 40 during installation and welding with the explosion-proof hole 12, and further enabling the battery cover plate assembly to be further thinned, and ensuring the flatness of the battery cover plate assembly.

[0035] Optionally, the thickness of the cover plate body 10 is W, 1.5mm≤W≤1.8mm, that is, further thinning 0.2mm-0.5mm on the existing size of the cover plate body 10, which can not only meet the welding thickness requirement between the battery cover plate assembly and the shell, but also reduce the weight of the battery cover plate assembly.

[0036] Further, the height of the first stepped groove 13 is not less than 0.5mm, which reduces the thickness of the position where the explosion-proof hole 12 is arranged, so that the periphery of the cover plate body 10 where the first stepped groove 13 is arranged will not be deformed greatly during welding, thereby reducing the deformation amount of the explosion-proof valve 40 when it is welded with the explosion-proof hole 12, so as to meet the design requirement.

[0037] In some embodiments, the cover plate body 10 is also provided with a plurality of reinforcing ribs, which are used to enhance the structural strength of the cover plate body 10. The arrangement of the reinforcing ribs further improves the structural strength of the battery cover plate assembly and further prevents the deformation and damage of the battery cover plate assembly. It can be understood that the arrangement position of the reinforcing ribs can be designed according to the structural strength requirement of the battery cover plate assembly, which is not specifically limited here.

[0038] Please refer to Fig. 2 and Fig. 3 In some optional embodiments, the cover plate body 10 is also provided with an electrode hole 14, which is used to install an electrode assembly 30. The second end surface 102 is also provided with a second stepped groove 15 surrounding the electrode hole 14. The second stepped groove 15 is arranged at the electrode hole 14, so that the thickness of the electrode hole 14 is reduced, thereby shortening the thickness of the electrode assembly 30, and further achieving the weight reduction of the battery cover plate assembly.

[0039] Please refer to Fig. 1 and Fig. 2 Specifically, the battery cover plate assembly further comprises a lower plastic part 20 arranged on one side of the cover plate body 10 for insulating the battery cover plate assembly from the battery cell. The lower plastic part 20 is provided with a protruding part 21 arranged in cooperation with the second stepped groove 15. Thus, the positioning and connection between the lower plastic part 20 and the cover plate body 10 are achieved, and the position where the electrode assembly 30 is connected to the lower plastic part 20 can be arranged at the other end of the protruding part 21, so that the side of the electrode assembly 30 facing the lower plastic part 20 will not exceed the height of the lower plastic part 20, thereby reducing the occupied area of the battery cover plate assembly in volume and improving the space utilization.

[0040] In some embodiments, the battery cover plate assembly further comprises an electrode assembly 30, one end of the electrode assembly 30 is insulated and arranged on the first end face 101, and the other end is sequentially sealed and arranged through the cover plate body 10 and the lower plastic part 20 and is limitingly connected with the lower plastic part 20, so that the sealing and fixing of the electrode assembly 30 can be realized, and the electrode assembly 30 penetrates through the entire battery cover plate assembly, so that the electrode assembly 30 can conductively connect the tab of the single battery cell with the external connecting member.

[0041] Specifically, the electrode assembly 30 comprises a pole 31, and the pole 31 is provided with a weight-reducing groove 311, which can facilitate the positioning of the single battery and the external connecting member when the battery cover plate assembly is connected, and also plays a role in reducing the weight of the pole 31, thereby reducing the weight of the battery cover plate assembly.

[0042] More specifically, the electrode assembly 30 comprises a riveting block 34, an upper plastic part 32 and a sealing member 33, one end of the pole 31 is connected with the riveting block 34, and the other end is sequentially arranged through the upper plastic part 32, the sealing member 33 and the lower plastic part 20 and is limitingly connected with the lower plastic part 20, so that the pole 31 is insulated and arranged on the cover plate body 10. In addition, the weight-reducing groove 311 is arranged at one end of the pole 31, so that the external connecting end of the pole 31 is provided with the weight-reducing groove 311, thereby realizing the positioning of the external structure.

[0043] In some embodiments, the cover plate body 10 is further provided with a liquid injection hole 16, and the first end face 101 is provided with a boss 17, the liquid injection hole 16 is arranged at the boss 17, the liquid injection hole 16 is used for injecting liquid into the single battery, and the boss 17 is arranged to make the liquid injection hole 16 away from the lower plastic part 20, so as to avoid that after the cover plate is thinned, the liquid injection hole 16 is close to the lower plastic part 20, and the sealing structure of the liquid injection hole 16 is installed to be closer to or interfere with the single battery cell, thereby improving the reliability and safety of the battery cover plate assembly.

[0044] In some embodiments, the cover plate body 10 is integrally formed by stamping, which is convenient to manufacture and has high structural strength.

[0045] The embodiment also provides a single battery comprising the battery cover plate assembly according to any one of the above-mentioned schemes. By adopting the battery cover plate assembly, the weight of the single battery can be reduced while ensuring the performance of the battery cover plate, thereby improving the volume energy density and mass energy density of the single battery.

[0046] 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 cover plate assembly, characterized by, The battery cover plate assembly comprises a cover plate body (10), the cover plate body (10) comprises oppositely arranged first and second end faces (101) and (102), and the outer peripheral wall of the cover plate body (10) is provided with an annular boss (11) protruding from the first end face (101) in the height direction of the boss, the annular boss (11) is used for welding with the shell of the battery; the cover plate body (10) is also provided with an explosion-proof hole (12) for mounting an explosion-proof valve (40), and the second end face (102) is provided with at least one first stepped groove (13) surrounding the explosion-proof hole (12).

2. The battery cover plate assembly of claim 1, wherein, The height of the first stepped groove (13) is not less than 0.5 mm.

3. The battery cover plate assembly of claim 1, wherein, The thickness of the cover plate body (10) is W, and 1.5 mm≤W≤1.8 mm.

4. The battery cover plate assembly of claim 1, wherein, The cover plate body (10) is also provided with a plurality of reinforcing ribs for enhancing the structural strength of the cover plate body (10).

5. The battery cover plate assembly of claim 1, wherein, The cover plate body (10) is also provided with an electrode hole (14) for mounting an electrode assembly (30), and the second end face (102) is also provided with a second stepped groove (15) surrounding the electrode hole (14).

6. The battery cover plate assembly of claim 5, wherein, It also comprises a lower plastic part (20) arranged on one side of the cover plate body (10), the lower plastic part (20) is provided with a protruding part (21) matched with the second stepped groove (15).

7. The battery cover plate assembly of claim 6, wherein, It also comprises an electrode assembly (30), one end of the electrode assembly (30) is insulated and arranged on the first end face (101), and the other end is sequentially sealed and arranged in the cover plate body (10) and the lower plastic part (20) and is limitingly connected with the lower plastic part (20).

8. The battery cover plate assembly of claim 7, wherein, The electrode assembly (30) comprises a pole (31), and the pole (31) is provided with a weight-reducing groove (311).

9. The battery cover plate assembly of any one of claims 1-8, wherein, The cover plate body (10) is also provided with a liquid injection hole (16), and the first end face (101) is provided with a boss (17), and the liquid injection hole (16) is arranged at the boss (17).

10. A single cell characterized by The battery cover plate assembly comprises a cover plate body (10), the cover plate body (10) comprises oppositely arranged first and second end faces (101) and (102), and the outer peripheral wall of the cover plate body (10) is provided with an annular boss (11) protruding from the first end face (101) in the height direction of the boss, the annular boss (11) is used for welding with the shell of the battery; the cover plate body (10) is also provided with an explosion-proof hole (12) for mounting an explosion-proof valve (40), and the second end face (102) is provided with at least one first stepped groove (13) surrounding the explosion-proof hole (12).

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