Battery top cover structure

Abstract

The utility model relates to a battery top cover structure which comprises a top cover, a positive pole assembly and lower plastic, 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 pole assembly comprises upper plastic, an upper bracket, an insulating sheet, a first positive pole, a second positive pole and a sealing ring; the upper plastic is arranged at the top of the first positive pole in an injection molding manner, the insulating sheet and the upper bracket are arranged at the upper part of the first positive pole in a sleeving manner, and the second positive pole is arranged at the lower part of the first positive pole in a sleeving manner; the upper bracket is arranged above the insulating sheet, and the upper bracket is connected with the top cover; the sealing ring is arranged at the edge of the positive pole hole, and the first positive pole penetrates through the positive pole hole and is arranged on the sealing ring. 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 independent and is made into assembly, then the pole is welded on the top cover sheet to form the complete top cover structure. Whether it is simple structure or friction welding structure, the negative pole of the cover plate pole structure in the existing market is all used by oxygen-free red copper, and the copper sheet is 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. 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 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 shell battery, which comprises a top cover, a positive pole assembly and a lower plastic, the top cover is abutted on the lower plastic, the top cover is provided with a positive pole hole, and the positive pole assembly is arranged in the positive pole hole.

[0006] 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, and the second positive pole is sleeved on the lower 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 sealing ring is arranged on the edge of the positive pole hole, and the first positive pole is arranged on the sealing ring through the positive pole hole.

[0007] As a preferred embodiment, the first positive pole comprises a first column part, a connecting column and a second column part which are integrally formed, one end of the connecting column is connected with the first column part, and the other end is connected with the second column part.

[0008] As a preferred embodiment, a fuse slot is arranged between the first column part and the second column part, and the fuse slot is circumferentially arranged on the outer side of the connecting column.

[0009] As a preferred implementation, the second positive pole post is provided with a through hole matched with the connecting post, the second positive pole post is sleeved outside the connecting post through the through hole, and the second positive pole post is accommodated in the fuse slot and is matched with the fuse slot.

[0010] As a preferred implementation, the diameter of the first post part is greater than the diameter of the second post part, and the diameter of the second post part is greater than the diameter of the connecting post; the first post part is provided with a first boss at the edge of one end close to the connecting post.

[0011] As a preferred implementation, the insulating sheet is arranged on the first boss; one side surface of the first boss is in abutment with the insulating sheet, and the other side surface is in abutment with the sealing ring; the upper support is sleeved on the first post part.

[0012] As a preferred implementation, the outer side of the positive pole hole is provided with a second boss, the upper support is fixedly connected with the second boss; the upper plastic sleeve is arranged outside the second boss, and the upper plastic is in abutment with the first post part, the upper support, the insulating sheet and the second boss, respectively. In this way, the main stress point for preventing the first post part from falling off is generated by the upper support, and the positive pole insulating pad plays a role in preventing the positive pole post from falling off and has an insulating effect.

[0013] As a preferred implementation, the second boss and the positive pole hole are provided with a connecting table therebetween; the sealing ring is arranged on the connecting table and 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.

[0014] As a preferred implementation, the lower plastic is provided with a first hole penetrating through the lower plastic, the first hole is arranged below the positive pole hole; the edge of the first hole is provided with a third boss, 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 post part, respectively.

[0015] As a preferred implementation, the battery top cover structure further comprises a positive pole connecting sheet, the positive pole connecting sheet is provided with a punching hole at two sides, a post connecting part is arranged between the two punching holes, and a fuse point is arranged in the post connecting part.

[0016] As a preferred implementation, the top cover is further provided with a negative pole hole, the negative pole hole and the positive pole hole are arranged at two ends of the top cover, respectively; and a negative pole post assembly is arranged in the negative pole hole.

[0017] As a preferred implementation, the top cover is provided with an explosion-proof valve hole, which is arranged between the positive pole hole and the negative pole hole; and an explosion-proof valve assembly is arranged in the explosion-proof valve hole.

[0018] As a preferred implementation, the lower plastic is further provided with a groove and a second hole; the second hole is arranged below the negative pole hole and is matched with the negative pole assembly; and the groove is arranged below the explosion-proof valve hole and is provided with a plurality of hollows.

[0019] As a preferred implementation, the shell battery is a square shell battery; and the square shell battery is a lithium ion battery or a sodium ion battery.

[0020] The application has the following beneficial effects: by arranging the first positive pole and the second positive pole in the positive pole assembly and controlling the relative arrangement position of the two, and by arranging the fuse groove on the first positive pole, a positive pole assembly structure with a fuse structure can be formed, which can automatically cut off the power supply in time 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 the short circuit may cause fire due to the sharp temperature rise of the strong current), thereby achieving the purpose of preventing fire. Through the structure of the application, automatic protection in the case of internal short circuit or overcurrent of the battery can be realized, 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 practicability and economy, and being suitable for production and use as a general product. BRIEF DESCRIPTION OF DRAWINGS

[0021] 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 embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative labor.

[0022] Figure 1 It is an overall structure schematic diagram of the battery top cover structure of an embodiment of the present application.

[0023] Figure 2 It is an overall structure schematic diagram of the battery top cover structure of an embodiment of the present application. Figure 1 It is an explosion structure schematic diagram of the battery top cover structure of an embodiment of the present application.

[0024] Figure 3 It is a cross-sectional structure schematic diagram of the battery top cover structure of an embodiment of the present application. Figure 1 It is a cross-sectional structure schematic diagram of the battery top cover structure of an embodiment of the present application.

[0025] Figure 4 It is a cross-sectional structure schematic diagram of the battery top cover structure of an embodiment of the present application.Figure 2 Structure diagram of the first positive pole column and the second positive pole column.

[0026] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work 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 positional 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] In the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] It should be noted that when an element is referred to as “fixed to” or “disposed on” another element, it can be directly on the other element or there can be a middle element. When an element is referred to as “connected to” another element, it can be directly connected to the other element or there can be a middle element.

[0031] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, 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 be explicitly or implicitly included 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 realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0032] Specifically, as shown in the figure, Figures 1 to 4 The utility model discloses a battery top cover structure, suitable for shell battery, including top cover 10, positive pole post assembly 20 and lower plastic 30, the top cover 10 is abutted on lower plastic 30, the top cover 10 is provided with positive pole post hole 11, and the positive pole post assembly 20 is arranged in the positive pole post hole 11,

[0033] The positive pole post assembly 20 includes upper plastic 21, upper support 22, insulating sheet 23, first positive pole post 24, second positive pole post 25 and sealing ring 26, the upper plastic 21 injection molding is in the top of first positive pole post 24, the insulating sheet 23, the upper support 22 are all set in the upper portion of first positive pole post 24, and the second positive pole post 25 is set in the lower portion of first positive pole post 24, the upper support 22 is arranged in the upper of insulating sheet 23, and the upper support 22 is connected with the top cover 10, the sealing ring 26 is arranged in the edge of positive pole post hole 11, and the first positive pole post 24 is arranged on the sealing ring 26 through the positive pole post hole 11.

[0034] Through the structure of the application, another layer of protection is provided in addition to the explosion-proof valve, the overall reliability and stability of the battery system are enhanced, the thermal failure of the battery caused by short circuit can be effectively prevented, the fire and explosion risk is reduced, and the safety of the battery is effectively improved. Moreover, through the structure of the application, the battery structure does not need to be greatly modified, and is convenient to implement and popularize. The positive pole post adopts the whole stamping forming technology, is stamped and formed in the mold, has the advantages of good consistency, simple process and low cost.

[0035] As a preferred embodiment, the first positive pole post 24 includes a first column part 241, a connecting column 242 and a second column part 243 which are integrally formed, one end of the connecting column 242 is connected with the first column part 241, and the other end is connected with the second column part 243.

[0036] As a preferred embodiment, a fuse slot 244 is arranged between the first column part 241 and the second column part 243, and the fuse slot 244 is arranged on the outer side of the connecting column 242 in a circumferential direction.

[0037] As a preferred embodiment, a through hole 251 is arranged on the second positive column 25, and the second positive column 25 is sleeved on the outer side of the connecting column 242 through the through hole 251, and the second positive column 25 is accommodated in the fuse slot 244, and the second positive column 25 is arranged in the fuse slot 244. In this way, when an external short circuit occurs, the circuit can be cut off in time through this arrangement, achieving the purpose of preventing fire and effectively improving the safety of use.

[0038] Under normal use current conditions, the fuse slot can safely complete its conductive function. 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 fuse slot will exceed the melting point of the column material, thereby achieving the purpose of cutting off the current.

[0039] As a preferred embodiment, the diameter of the first column part 241 is greater than the diameter of the second column part 243, and the diameter of the second column part 243 is greater than the diameter of the connecting column 242; a first boss 2411 is arranged on the edge of one end of the first column part 241 in a circumferential direction.

[0040] As a preferred embodiment, the insulating sheet 23 is arranged on the first boss 2411; one side surface of the first boss 2411 abuts against the insulating sheet 23, and the other side surface abuts against the sealing ring 26; and the upper support 22 is sleeved on the first column part 241.

[0041] In this application, the shapes of the first positive column and the second positive column can be set according to actual use needs, which can be circular, square, etc. In this embodiment, the first positive column and the second positive column are both arranged as circular columns.

[0042] As a preferred embodiment, a second boss 12 is arranged on the outer side of the positive column hole 11 in a circumferential direction, 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 abuts against the first column part 241, the upper support 22, the insulating sheet 23, and the second boss 12, respectively. In this way, the main stress point for preventing the first column part 241 from falling off is generated by the upper support 22, and the insulating sheet 23 plays a role in stopping the column from falling off and also has an insulating effect.

[0043] As a preferred embodiment, a connecting platform 13 is arranged between the second boss 12 and the positive post hole 11; the sealing ring 26 is arranged on the connecting platform 13, and the sealing ring 26 abuts against the second boss 12 and the connecting platform 13 respectively; the sealing ring 26 is arranged in matching with the connecting platform 13; the second boss 12, the connecting platform 13, the positive post hole 11 and the top cover 10 are integrally formed.

[0044] As a preferred embodiment, the lower plastic 30 is provided with a first hole 31 penetrating through the lower plastic 30, and the first hole 31 is arranged below the positive post hole 11; the edge of the first hole 31 is circumferentially provided with a third boss 32, and the positive post hole 11 is arranged outside the third boss 31; the third boss 32 abuts against the positive post hole 11, the sealing ring 26 and the second post part 243 respectively.

[0045] As a preferred embodiment, the battery top cover structure further comprises a positive connection sheet 40, both sides of the positive connection sheet 40 are provided with a punching hole 41, and a post connecting part (not marked in the figure) is arranged between the two punching holes 41, and a fuse point (not marked in the figure) is arranged in the post connecting part.

[0046] As a preferred embodiment, the top cover 10 is further provided with a negative post hole 14, and the negative post hole 14 and the positive post hole 11 are arranged at both ends of the top cover 10 respectively; the negative post hole 14 is provided with a negative post assembly 50.

[0047] In the structure of the present application, the negative post assembly 50 comprises a negative upper plastic 51, a negative upper support 52, a negative insulating sheet 53, a negative post 54 and a negative sealing ring 55. The arrangement mode and the relative arrangement position of each component are similar to those of each component of the positive post assembly 20. The negative post assembly 50 is connected with a negative connection sheet 60.

[0048] As a preferred embodiment, the top cover 10 is provided with an explosion-proof valve hole 15, and the explosion-proof valve hole 15 is arranged between the positive post hole 11 and the negative post hole 14; the explosion-proof valve hole 15 is provided with an explosion-proof valve assembly 70.

[0049] As a preferred embodiment, the lower plastic 30 is further provided with a groove 33 and a second hole 34; the second hole 34 is arranged below the negative post hole 14, and the second hole 34 is arranged in matching with the negative post assembly 50; the groove 33 is arranged below the explosion-proof valve hole 15, and a plurality of hollow arrangements 331 are arranged in the groove 33.

[0050] 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.

[0051] The application can form a positive pole post assembly structure with a fuse structure by setting a first positive pole post and a second positive pole post in the positive pole post assembly and controlling the relative setting positions of the two, and setting a fuse slot on the first positive pole post, can effectively and timely automatically cut off the power supply 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 strong current may cause the temperature of the foreign matter causing short circuit to rise sharply, resulting in fire), to prevent fire. Through the structure of the application, automatic protection in the case of internal short circuit or overcurrent of the battery can be realized, thereby significantly improving the safety performance of the battery structure, not only effectively protecting the battery, but also prolonging the service life of the battery, reducing the use cost, having higher practicability and economy, and can be produced and used as a general product.

[0052] In the embodiment of the application, the shell battery is generally a square battery. The cover plate can be an aluminum cover plate or a cover plate of other materials.

[0053] In the application, the sealing ring can be prepared from one of PP, PC, PVC, PPS, PE and PET or a mixture of at least two materials.

[0054] The lower plastic can be processed by injection molding, has high precision, and has simple and reliable structure.

[0055] 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 application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0056] In addition, it should be understood that although the 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, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0057] The above is only the preferred embodiment of the application, and does not limit the patent range of the application, and any equivalent structural transformation made by using the content of the application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the application.

Claims

1. A battery top cover structure, characterized in that, Suitable for battery casings, including a top cover, a positive terminal assembly, and a lower plastic layer; the top cover abuts against the lower plastic layer; the top cover has a positive terminal hole, and the positive terminal assembly is disposed within the positive terminal hole; The positive electrode assembly includes an upper plastic core, an upper support, an insulating sheet, a first positive electrode, a second positive electrode, and a sealing ring. The upper plastic core is injection molded onto the top of the first positive electrode. The insulating sheet and the upper support are both sleeved on the upper part of the first positive electrode, and the second positive electrode is sleeved on the lower part of the first positive electrode. The upper support is disposed above the insulating sheet and is connected to the top cover. The sealing ring is disposed at the edge of the positive electrode hole, and the first positive electrode passes through the positive electrode hole and is disposed on the sealing ring.

2. The battery top cover structure according to claim 1, characterized in that, The first positive electrode post includes a first post portion, a connecting post, and a second post portion that are integrally formed; one end of the connecting post is connected to the first post portion, and the other end is connected to the second post portion.

3. The battery top cover structure according to claim 2, characterized in that, A fusible groove is provided between the first column and the second column, and the fusible groove is circumferentially located on the outside of the connecting column.

4. The battery top cover structure according to claim 3, characterized in that, The second positive terminal post is provided with a through hole that is adapted to the connecting post. The second positive terminal post is sleeved on the outside of the connecting post through the through hole, and the second positive terminal post is housed in the fuse groove. The second positive terminal post and the fuse groove are adapted to each other.

5. The battery top cover structure according to claim 2, characterized in that, The diameter of the first column is larger than the diameter of the second column, and the diameter of the second column is larger than the diameter of the connecting column; a first boss is provided circumferentially on the edge of the first column near the end of the connecting column.

6. The battery top cover structure according to claim 5, characterized in that, The insulating sheet is disposed on the first protrusion; one side of the first protrusion abuts against the insulating sheet, and the other side abuts against the sealing ring; the upper bracket is sleeved on the first column.

7. The battery top cover structure according to claim 2, characterized in that, A second protrusion is provided circumferentially on the outer side of the positive electrode post hole, and the upper bracket is fixedly connected to the second protrusion; the upper plastic sleeve is fitted on the outer side of the second protrusion, and the upper plastic abuts against the first post, the upper bracket, the insulating sheet, and the second protrusion respectively.

8. The battery top cover structure according to claim 7, characterized in that, A connecting platform is provided between the second boss and the positive electrode post hole; the sealing ring is disposed on the connecting platform, and the sealing ring abuts against the second boss and the connecting platform respectively; the sealing ring is adapted to the connecting platform; the second boss, the connecting platform, the positive electrode post hole and the top cover are all integrally formed.

9. The battery top cover structure according to claim 2, characterized in that, The lower plastic has a first hole penetrating through it, which is located below the positive electrode post hole. A third protrusion is circumferentially provided on the edge of the first hole, and the positive electrode post hole is sleeved on the outside of the third protrusion. The third protrusion abuts against the positive electrode post hole, the sealing ring, and the second post portion.

10. The battery top cover structure according to claim 1, characterized in that, The battery top cover structure also includes a positive electrode connecting piece, with punched holes on both sides of the positive electrode connecting piece, and a terminal connecting part between the two punched holes, with a melting point inside the terminal connecting part. The top cover is also provided with a negative terminal hole, and the negative terminal hole and the positive terminal hole are respectively provided at both ends of the top cover; a negative terminal assembly is provided in the negative terminal hole; The top cover is provided with an explosion-proof valve hole, which is located between the positive terminal hole and the negative terminal hole; an explosion-proof valve assembly is provided inside the explosion-proof valve hole; The lower plastic is also provided with a groove and a second hole; the second hole is provided below the negative electrode post hole and is adapted to the negative electrode post assembly; the groove is provided below the explosion-proof valve hole and has multiple hollowed-out features. The battery casing is a square-shaped battery casing; the square-shaped battery casing is a lithium-ion battery or a sodium-ion battery.

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