Battery top cover structure

Abstract

The utility model relates to a battery top cover structure which is suitable for a shell battery and comprises a top cover, a positive pole assembly, lower plastic and a positive connecting piece, the top cover abuts against the lower plastic cement. A positive pole column hole is formed in the top cover, and the positive pole column assembly is arranged in the positive pole column hole; the positive electrode connecting sheet is arranged in a manner of abutting against the side surface, far away from the top cover, of the lower plastic, and the positive electrode connecting sheet is connected with the positive electrode column assembly; the positive electrode connecting piece comprises a tab connecting part, a first open slot, a second open slot and a pole connecting part; the first open slot and the second open slot are both arranged between the tab connecting part and the pole connecting part, and the first open slot and the second open slot are symmetrically arranged; and the pole connecting part is respectively connected with the tab connecting part and the positive pole assembly. The structure has an overcurrent protection function, is high in safety and reliability, is higher in practicability and economical efficiency, and can be used as a general product for production and use.

Description

TECHNICAL FIELD

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

[0002] With the development of science and technology, power battery as a kind of energy device is more and more concerned, has been widely used in mobile phone, electric vehicle, electric tool and other fields.

[0003] In the conventional square lithium ion battery or sodium ion battery structure, the pole structure of its top cover has multiple forms, there is integral structure, also has the pole post that is made into assembly independently, then the pole post is welded on the top cover sheet to form the complete top cover structure. Whether it is a minimalist structure or a friction welding structure, the negative pole post in the cover plate pole structure of the existing market, some of them use oxygen-free red copper, and some of them are welded to the aluminum column by friction welding, and then machined to the qualified size. No matter which way is adopted, its structure is complex, the manufacturing cost is high, and it is difficult to be widely applied. Moreover, the existing battery cover plate structure is easy to cause external circuit short circuit due to battery abuse, or collision, or metal foreign matter, if the current is not cut off in time, the foreign matter causing short circuit is easy to cause fire due to sharp temperature rise. SUMMARY

[0004] Therefore, the utility model provides a battery top cover structure, aims at solving the defects of the prior art, such as the complex top cover pole structure, high manufacturing cost, lack of timely cut-off current setting when short circuit, and difficult to be widely applied.

[0005] To achieve the above-mentioned purpose, the utility model embodiment provides the following technical scheme: a battery top cover structure is suitable for a shell battery, comprising a top cover, a positive pole post assembly, a lower plastic and a positive connection sheet, the top cover is abutted on the lower plastic, the top cover is provided with a positive pole hole, the positive pole post assembly is arranged in the positive pole hole, the positive connection sheet is abututted and arranged with the side of the lower plastic away from the top cover, and the positive connection sheet is connected with the positive pole post assembly.

[0006] The positive connection sheet comprises a tab connecting part, a first slot, a second slot and a pole connecting part, the first slot and the second slot are arranged between the tab connecting part and the pole connecting part, and the first slot and the second slot are symmetrically arranged, and the pole connecting part is connected with the tab connecting part and the positive pole post assembly respectively.

[0007] As a preferred embodiment, the tab connecting part, the first slot, the second slot and the pole connecting part are integrally formed.

[0008] As a preferred implementation, the pole connecting part comprises a connecting body, a first fusing part and a second fusing part; one end of the connecting body is connected with the first fusing part, and the other end is connected with the second fusing part; the first fusing part and the second fusing part are respectively connected with the tab connecting part; the connecting body is connected with the positive pole assembly.

[0009] As a preferred implementation, the width of the first fusing part is the same as the width of the second fusing part; the width of the first fusing part and the width of the second fusing part are both smaller than the width of the connecting body.

[0010] As a preferred implementation, the first fusing part and the second fusing part are symmetrically arranged; the connecting body, the first fusing part and the second fusing part are integrally formed.

[0011] As a preferred implementation, the positive pole assembly comprises an upper plastic, an upper support, an insulating sheet, a first positive pole, a second positive pole and a sealing ring; the upper plastic is injection molded on the top of the first positive pole, the insulating sheet and the upper support are both sleeved on the upper part of the first positive pole, the upper support is arranged above the insulating sheet, and the upper support is connected with the top cover; the second positive pole is arranged at the bottom of the first positive pole; the sealing ring is arranged at the edge of the positive pole hole, and the second positive pole passes through the positive pole hole and is arranged on the sealing ring; one end of the second positive pole away from the first positive pole is connected with the connecting body.

[0012] As a preferred implementation, the first positive pole is circumferentially provided with a first boss at the edge of the end close to the second positive pole, and the first positive pole, the first boss and the second positive pole are integrally formed; the first boss is respectively abutted with the upper plastic and the sealing ring.

[0013] As a preferred implementation, the diameter of the first positive pole is greater than the diameter of the second positive pole; the sealing ring is adapted to the second positive pole.

[0014] As a preferred implementation, a second boss is circumferentially arranged outside the positive pole hole, and the upper support is fixedly connected with the second boss; the upper plastic is sleeved outside the second boss, and the upper plastic is respectively abutted with the first positive pole, the upper support, the insulating sheet and the second boss.

[0015] As a preferred implementation, a connecting platform is arranged between the second boss and the positive pole hole; the sealing ring is arranged on the connecting platform, and the sealing ring is in abutment with the second boss and the connecting platform respectively; the sealing ring is arranged in matching with the connecting platform; the second boss, the connecting platform, the positive pole hole and the top cover are integrally formed.

[0016] As a preferred implementation, a first hole is arranged on the lower plastic and penetrates the lower plastic, and the first hole is arranged below the positive pole hole; a third boss is arranged on the edge of the first hole in a circumferential direction, and the positive pole hole is arranged outside the third boss; the third boss is in abutment with the positive pole hole, the sealing ring and the second positive pole respectively.

[0017] As a preferred implementation, a negative pole hole is further arranged on the top cover, and the negative pole hole and the positive pole hole are arranged at two ends of the top cover respectively; a negative pole assembly is arranged in the negative pole hole.

[0018] As a preferred implementation, an explosion-proof valve hole is arranged on the top cover, and the explosion-proof valve hole is arranged between the positive pole hole and the negative pole hole; an explosion-proof valve assembly is arranged in the explosion-proof valve hole.

[0019] As a preferred implementation, a groove and a second hole are further arranged on the lower plastic; the second hole is arranged below the negative pole hole, and the second hole is arranged in matching with the negative pole assembly; the groove is arranged below the explosion-proof valve hole, and a plurality of hollows are arranged in the groove.

[0020] As a preferred implementation, the shell battery is a square shell battery; the square shell battery is a lithium ion battery or a sodium ion battery.

[0021] The application has the following beneficial effects: by arranging the slot and the fusing part on the positive pole connecting piece and controlling the relative arrangement position, a connecting piece structure with a fusing structure is formed, in the case of abuse of the battery, the power supply can be automatically cut off in time, and the purpose of preventing fire is achieved. Through the structure of the application, automatic protection can be realized in the case of internal short circuit or overcurrent of the battery, thereby significantly improving the safety performance of the battery structure, effectively protecting the battery, prolonging the service life of the battery, reducing the use cost, having higher practicality and economy, and can be produced and used as a general product. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below only show some of the embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings by those skilled in the art without creative labor.

[0023] Figure 1 The whole structure schematic diagram of the battery top cover structure of the embodiment of the present application is shown in the figure.

[0024] Figure 2 The exploded structure schematic diagram of the battery top cover structure of the embodiment of the present application is shown in the figure. Figure 1

[0025] Figure 3 The cross-sectional structure schematic diagram of the battery top cover structure of the embodiment of the present application is shown in the figure. Figure 1

[0026] Figure 4 The structure schematic diagram of the positive electrode connecting piece of the embodiment of the present application is shown in the figure. Figure 2 The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0027] DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0028] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, top, bottom, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications will also change accordingly.

[0029] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, top, bottom, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications will also change accordingly.

[0030] ​​In this application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; 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 of two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0031] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or a middle element can exist at the same time.

[0032] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0033] Specifically, as shown in Figures 1 to 4 The utility model discloses a battery top cover structure is suitable for shell battery, including top cover 10, positive pole post subassembly 20, lower plastic 30 and positive pole connecting piece 40, the top cover 10 is on lower plastic 30 and is in abutment, top cover 10 is provided with positive pole post hole 11, and positive pole post subassembly 20 is set up in positive pole post hole 11, positive pole connecting piece 40 is in abutment with the side surface of lower plastic 30 away from top cover 10 is arranged, and positive pole connecting piece 40 is connected with positive pole post subassembly 20,

[0034] The positive pole connecting piece 40 includes a tab connecting portion 41, a first slot 42, a second slot 43, and a pole connecting portion 44. The first slot 42 and the second slot 43 are both arranged between the tab connecting portion 41 and the pole connecting portion 44, and the first slot 42 and the second slot 43 are symmetrically arranged. The pole connecting portion 44 is connected with the tab connecting portion 41 and the positive pole post subassembly 20, respectively.

[0035] By the structure of the application, another layer of protection is provided in addition to the explosion-proof valve, enhancing the overall reliability and stability of the battery system, effectively preventing thermal failure of the battery caused by short circuit, reducing the risk of fire and explosion, and effectively improving the safety of the battery. Moreover, by the structure of the application, the battery structure does not need to be greatly modified, facilitating implementation and promotion. The positive pole column is formed by integral stamping, which has the advantages of good consistency, simple process and low cost.

[0036] As a preferred embodiment, the tab connecting part 41, the first slot 42, the second slot 43 and the pole connecting part 44 are integrally formed.

[0037] As a preferred embodiment, the pole connecting part 44 includes a connecting body 441, a first fuse part 442 and a second fuse part 443; one end of the connecting body 441 is connected with the first fuse part 442, and the other end is connected with the second fuse part 443; the first fuse part 442 and the second fuse part 443 are respectively connected with the tab connecting part 41; the connecting body 441 is connected with the positive pole assembly 20.

[0038] In this way, when external short circuit occurs, the circuit can be cut off in time by this arrangement to prevent fire and effectively improve safety.

[0039] Under normal use current conditions, the first fuse part and the second fuse part can safely complete their conductive function, and if battery abuse occurs, such as positive and negative short circuit, due to the strong short circuit current, when the current exceeds the designed fuse current, the thermal equilibrium temperature of the first fuse part and the second fuse part will exceed the melting point of the pole material, thereby achieving the purpose of cutting off the current.

[0040] As a preferred embodiment, the width of the first fuse part 442 is the same as the width of the second fuse part 443; the width of the first fuse part 442 and the width of the second fuse part 443 are both smaller than the width of the connecting body 441.

[0041] As a preferred embodiment, the first fuse part 442 and the second fuse part 443 are symmetrically arranged; the connecting body 441, the first fuse part 442 and the second fuse part 443 are integrally formed.

[0042] As a preferred embodiment, the positive pole post assembly 20 comprises an upper plastic 21, an upper support 22, an insulating sheet 23, a first positive pole post 24, a second positive pole post 25 and a sealing ring 26; the upper plastic 21 is injection molded on the top of the first positive pole post 24, the insulating sheet 23 and the upper support 22 are sleeved on the upper part of the first positive pole post 24, the upper support 22 is arranged above the insulating sheet 23, and the upper support 22 is connected with the top cover 10; the second positive pole post 25 is arranged at the bottom of the first positive pole post 24; the sealing ring 26 is arranged at the edge of the positive pole post hole 11, and the second positive pole post 25 passes through the positive pole post hole 11 and is arranged on the sealing ring 26; the end of the second positive pole post 25 away from the first positive pole post 24 is connected with the connecting body 441.

[0043] As a preferred embodiment, the first positive pole post 24 is circumferentially provided with a first boss 241 near the edge of one end of the second positive pole post 25, and the first positive pole post 24, the first boss 241 and the second positive pole post 25 are integrally formed; the first boss 241 is respectively abutted with the upper plastic 21 and the sealing ring 26.

[0044] As a preferred embodiment, the diameter of the first positive pole post 24 is greater than the diameter of the second positive pole post 25; the sealing ring 26 is arranged in fit with the second positive pole post 25.

[0045] In the present application, the shapes of the first positive pole post 24 and the second positive pole post 25 can be set according to actual needs, which can be circular, square or the like. In the present embodiment, the first positive pole post 24 and the second positive pole post 25 are both arranged as circular pole posts.

[0046] As a preferred embodiment, the outer side of the positive pole post hole 11 is circumferentially provided with a second boss 12, and the upper support 22 is fixedly connected with the second boss 12; the upper plastic 21 is sleeved on the outer side of the second boss 12, and the upper plastic 21 is respectively abutted with the first positive pole post 24, the upper support 22, the insulating sheet 23 and the second boss 12. In this way, the main stress point for preventing the first positive pole post 24 from falling off is generated by the upper support, and the positive pole insulating pad plays the role of stopping the positive pole post and has the insulation effect.

[0047] As a preferred embodiment, a connecting table 13 is arranged between the second boss 12 and the positive pole post hole 11; the sealing ring 26 is arranged on the connecting table 13, and the sealing ring 26 is respectively abutted with the second boss 12 and the connecting table 13; the sealing ring 26 is arranged in fit with the connecting table 13; the second boss 12, the connecting table 13, the positive pole post hole 11 and the top cover 10 are integrally formed.

[0048] As a preferred embodiment, the lower plastic 30 is provided with a first hole 31 penetrating through the lower plastic 30, the first hole 31 is arranged below the positive pole column hole 11; the edge of the first hole 31 is circumferentially provided with a third boss 311, the positive pole column hole 11 is sleeved outside the third boss 311; the third boss 311 abuts with the positive pole column hole 11, the sealing ring 26 and the second positive pole column 25 respectively.

[0049] As a preferred embodiment, the top cover 10 is further provided with a negative pole column hole 14, the negative pole column hole 14 and the positive pole column hole 11 are arranged at two ends of the top cover 10 respectively; the negative pole column assembly 50 is arranged in the negative pole column hole 14.

[0050] In the structure of the present application, the negative pole column assembly 50 includes a negative pole upper plastic 51, a negative pole upper support 52, a negative pole insulation sheet 53, a negative pole column 54 and a negative pole sealing ring 55. The arrangement mode and the relative arrangement position of each component are similar to those of each component of the positive pole column assembly 20. The negative pole column assembly 50 is connected with the negative pole connecting sheet 60.

[0051] As a preferred embodiment, the top cover 10 is provided with an explosion-proof valve hole 15, the explosion-proof valve hole 15 is arranged between the positive pole column hole 11 and the negative pole column hole 14; the explosion-proof valve assembly 70 is arranged in the explosion-proof valve hole 15.

[0052] As a preferred embodiment, the lower plastic 30 is further provided with a groove 32 and a second hole 33; the second hole 33 is arranged below the negative pole column hole 14, and the second hole 33 is arranged to match the negative pole column assembly 50; the groove 32 is arranged below the explosion-proof valve hole 15, and a plurality of hollows are arranged in the groove 32.

[0053] As a preferred embodiment, the shell battery is a square shell battery; the square shell battery is a lithium ion battery or a sodium ion battery.

[0054] By arranging the slot and the fuse part on the positive pole connecting sheet and controlling the relative arrangement position, the connecting sheet structure with the fuse structure can be formed, in the case of battery abuse (such as external circuit short circuit caused by collision or metal foreign matter, if the current is not cut off in time, the foreign matter causing short circuit may cause fire due to sharp temperature rise of strong current), the power supply can be automatically cut off in time, so as to prevent fire. Through the structure of the present application, automatic protection can be realized in the case of internal short circuit or overcurrent of the battery, so as to significantly improve the safety performance of the battery structure, not only can effectively protect the battery, but also prolong the service life of the battery, reduce the use cost, have higher practicability and economy, and can be produced and used as a general product.

[0055] In the embodiments of the present application, the shell battery is generally a square battery. The cover plate can be an aluminum cover plate or a cover plate made of other materials.

[0056] In the present application, the sealing ring can be made of one of PP, PC, PVC, PPS, PE and PET or at least two materials.

[0057] The lower plastic can be processed by injection molding, has high precision, and simple and reliable structure.

[0058] In the description of the specification, the description referring to the terms "an embodiment", "an example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0059] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity. The skilled person should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by the skilled person.

[0060] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A battery top cover structure, characterized by, The application relates to a shell battery, which comprises a top cover, a positive pole column assembly, a lower plastic and a positive pole connecting sheet; the top cover is in abutment with the lower plastic; a positive pole column hole is arranged on the top cover, the positive pole column assembly is arranged in the positive pole column hole; the positive pole connecting sheet is in abutment with the side of the lower plastic away from the top cover, and the positive pole connecting sheet is connected with the positive pole column assembly. The positive pole connecting sheet comprises a tab connecting part, a first slot, a second slot and a pole connecting part; the first slot and the second slot are arranged between the tab connecting part and the pole connecting part, and the first slot and the second slot are symmetrically arranged; the pole connecting part is connected with the tab connecting part and the positive pole column assembly respectively.

2. The battery cup structure of claim 1, wherein, The tab connecting part, the first slot, the second slot and the pole connecting part are integrally formed.

3. The battery cover structure of claim 1, wherein The pole connecting part comprises a connecting body, a first fusing part and a second fusing part; one end of the connecting body is connected with the first fusing part, and the other end is connected with the second fusing part; the first fusing part and the second fusing part are connected with the tab connecting part respectively; the connecting body is connected with the positive pole column assembly.

4. The battery cup structure of claim 3, wherein, The width of the first fusing part is the same as the width of the second fusing part; the width of the first fusing part and the width of the second fusing part are smaller than the width of the connecting body.

5. The battery cover structure of claim 3, wherein The first fusing part and the second fusing part are symmetrically arranged; the connecting body, the first fusing part and the second fusing part are integrally formed.

6. The battery cup structure of claim 3, wherein, The positive pole column assembly comprises an upper plastic, an upper support, an insulating sheet, a first positive pole column, a second positive pole column and a sealing ring; the upper plastic is injection molded on the top of the first positive pole column, the insulating sheet and the upper support are sleeved on the upper part of the first positive pole column, the upper support is arranged above the insulating sheet, and the upper support is connected with the top cover; the second positive pole column is arranged at the bottom of the first positive pole column; the sealing ring is arranged at the edge of the positive pole column hole, the second positive pole column passes through the positive pole column hole and is arranged on the sealing ring; one end of the second positive pole column away from the first positive pole column is connected with the connecting body.

7. The battery cup structure of claim 6, wherein, The edge of one end of the first positive pole column close to the second positive pole column is circumferentially provided with a first boss, and the first positive pole column, the first boss and the second positive pole column are integrally formed; the first boss is in abutment with the upper plastic and the sealing ring respectively.

8. The battery cup structure of claim 6, wherein, The diameter of the first positive pole column is larger than the diameter of the second positive pole column; the sealing ring is matched with the second positive pole column.

9. The battery cup structure of claim 6, wherein, The outer side of the positive pole column hole is circumferentially provided with a second boss, the upper support is fixedly connected with the second boss; the upper plastic is sleeved on the outer side of the second boss, and the upper plastic is in abutment with the first positive pole column, the upper support, the insulating sheet and the second boss respectively.

10. The battery cup structure of claim 9, wherein, The second boss is provided with a connecting table between the positive pole hole; the sealing ring is arranged on the connecting table, and the sealing ring is in abutment with the second boss and the connecting table respectively; the sealing ring is matched with the connecting table; the second boss, the connecting table, the positive pole hole and the top cover are integrally formed; The lower plastic is provided with a first hole penetrating through the lower plastic, and the first hole is arranged below the positive pole hole; the edge of the first hole is circumferentially provided with a third boss, and the positive pole hole is sleeved outside the third boss; the third boss is in abutment with the positive pole hole, the sealing ring and the second positive pole respectively; The shell battery is a square shell battery; the square shell battery is a lithium ion battery or a sodium ion battery.

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