Square battery cell structure

Abstract

The utility model relates to a square battery cell structure, which comprises a shell, a battery cell, a plurality of battery cells, a plurality of battery cells and a plurality of battery cells, and is characterized in that the shell is internally provided with a containing cavity; the roll core is arranged in the accommodating cavity, and the roll core comprises a plurality of tabs; the cover cap assembly is installed on the opening, the cover cap assembly comprises a cover plate, an insulating seat and a plurality of connecting pieces, the insulating seat is arranged on the cover plate in a penetrating mode in the thickness direction of the cover plate, connecting holes are formed in the insulating seat in a penetrating mode in the thickness direction of the insulating seat, at least one part of each connecting piece is embedded in the insulating seat, and the connecting pieces are arranged in the connecting holes in a penetrating mode. The connecting piece comprises a first connecting part and a second connecting part which are exposed outside the insulating seat, the first connecting part and the second connecting part are respectively positioned on two sides of the cover plate along the thickness direction, and the second connecting part is connected with the tab; and the rivet is arranged in the connecting hole, and the rivet is used for integrally pressing and fixing the cap assembly through riveting. Riveting compression sealing is adopted, the process is simple and effective, meanwhile, the cap assembly is provided with the multiple corresponding connecting pieces, the tabs can be directly electrified with the outer side of the battery cell through the connecting pieces, the tabs are effectively protected, and the service life of the tabs is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, specifically, relate to a square electric core structure. BACKGROUND

[0002] The existing electric core is usually provided with a cap, and the electric core is packaged in the shell through the cap, the cap has many parts, and the components of the cap need to be assembled in the production process, which leads to complicated production process, and the cap is assembled, and gaps are inevitably generated between the parts, and the sealing effect is poor, in addition, the tab of the existing electric core is usually exposed outside through the cap, which can shorten the service life of the tab and even cause failure, so that the electric core cannot be normally used. SUMMARY

[0003] Therefore, the utility model provides a square electric core structure which is simple and effective in structure and good in sealing effect.

[0004] The utility model discloses a square electric core structure which is simple and effective in structure and good in sealing effect.

[0005] A square electric core structure comprises an outer shell with an accommodating cavity inside, an open end of the outer shell, a roll core in the accommodating cavity, the roll core comprising a plurality of tabs, a cap assembly installed on the open end, the cap assembly comprising a cover plate, an insulating seat and a plurality of connecting pieces, the insulating seat being arranged through the cover plate along the thickness direction of the cover plate, the insulating seat being formed with a connecting hole along the thickness direction, at least a part of each connecting piece being embedded in the insulating seat, the connecting piece comprising a first connecting part and a second connecting part exposed outside the insulating seat, the first connecting part and the second connecting part being located on both sides of the cover plate along the thickness direction respectively, the second connecting part being connected with the tab, and a rivet arranged in the connecting hole, the rivet being used to compress and fix the cap assembly as a whole by riveting.

[0006] In the technical scheme, the cap assembly encapsulates the winding core in the shell, the first connecting part is located outside the shell after the cap assembly is installed, and the second connecting part is located in the accommodating cavity of the shell, wherein the connecting piece is made of conductive material, the insulating seat is made of insulating material, a part of the connecting piece is embedded in the insulating seat, and the remaining part is the first connecting part and the second connecting part exposed outside the insulating seat, the connecting piece is separated from the cover plate through the insulating seat to avoid direct contact with the cover plate, thereby insulating the connecting piece and ensuring the conductive effect, meanwhile, the inside of the shell can also be sealed after the cap assembly is installed, the winding core is provided with a plurality of tabs, the tabs are led out from one end of the winding core close to the cap assembly, each tab is connected with a second connecting part, thereby making the winding core conductive with the connecting piece, the tabs can be directly powered from outside through the connecting piece, which is more flexible and convenient, in addition, the plurality of tabs can reduce the impedance of the battery core to realize the multi-rate charging and discharging function, and increase the heat dissipation area to help the battery core dissipate heat; in addition, the insulating seat is formed with a connecting hole penetrating through the insulating seat, and a rivet is installed in the connecting hole, the rivet can be thickened at both ends through riveting, thereby tightly fixing the cap assembly as a whole, without the need for assembly, the process is simple, and the fixing and sealing effects are good.

[0007] Optionally, in one of the embodiments, the connecting piece further comprises a connecting part, the first connecting part and the second connecting part are connected through the connecting part, and the connecting part is embedded in the inside of the insulating seat.

[0008] In the technical scheme, the first connecting part and the second connecting part are connected with the connecting part, and the connecting part is embedded in the inside of the insulating seat, thereby connecting and fixing the connecting piece with the insulating seat.

[0009] Optionally, in one of the embodiments, the first connecting part is parallel to the second connecting part, and the connecting part is perpendicular to the first connecting part and the second connecting part.

[0010] In the technical scheme, the connecting part is located between the first connecting part and the second connecting part and is connected perpendicularly to the first connecting part and the second connecting part.

[0011] Optionally, in one of the embodiments, the first connecting part and the second connecting part both have a gap with the surface of the cap.

[0012] In the technical scheme, since part of the cover plate is made of metal and usually has a certain conductive capacity, by leaving a certain gap between the first connecting part and the second connecting part and the cap, direct contact of the connecting piece with the cap is avoided, thereby ensuring the conductive effect of the connecting piece.

[0013] Optionally, in one of the embodiments, a first insulating pad is arranged in the gap between the first connecting part and the cover plate, and a hollow hole is arranged on the first insulating pad for providing a space for the insulating seat.

[0014] In the above technical solution, the hollow hole is arranged on the first insulating pad to provide a space for the insulating seat, so that the first insulating pad can be attached to the cover plate. When the battery generates an abnormality during charging, the core inside the shell may expand, and the first insulating pad is used to prevent the second connecting part from directly contacting the cover plate when expanding, thereby avoiding the occurrence of electric leakage and improving safety.

[0015] Optionally, in one of the embodiments, a ring of embedding grooves is arranged around the outer periphery of the insulating seat, and the cover plate extends around the insulating seat and is embedded in the embedding grooves.

[0016] In the above technical solution, a part of the cover plate extends and is embedded in the embedding grooves outside the insulating seat, so that the cover plate and the insulating seat are connected stably, and the sealing performance of the cap assembly is improved, ensuring the sealing effect of the shell.

[0017] Optionally, in one of the embodiments, the cap assembly is an integrally formed part.

[0018] In the above technical solution, the cap assembly is integrally formed by insert injection molding, which is firm and once-formed, and does not need to be assembled, making production more convenient.

[0019] Optionally, in one of the embodiments, the end of the tab is bent to form a fitting part, and the fitting part is attached to the second connecting part.

[0020] In the above technical solution, the fitting part is parallel to the second connecting part and attached to each other, so that the tab is in conduction with the connecting piece, and the core can be directly electrified with the outside through the connecting piece.

[0021] Optionally, in one of the embodiments, a second insulating pad is further included, and the second insulating pad is attached to the end face of the core away from the opening.

[0022] In the above technical solution, the second insulating pad is attached to the end of the core close to the inner bottom side of the shell for insulation protection.

[0023] Optionally, in one of the embodiments, the two ends of the rivet after being thickened are respectively in contact with the insulating seat and the second connecting part.

[0024] In the above technical solution, the two ends of the rivet are thickened to form a rivet head, which exerts a counter-restraining force on the cap assembly to achieve riveting fixation of the whole cap assembly.

[0025] Compared with the prior art, the application has the advantages and beneficial effects that:

[0026] The core of the application adopts a multi-tab design, and a plurality of connecting pieces corresponding to the tabs are arranged on the cap assembly, so that the tabs can be directly connected to the outside for power supply, which is convenient to use, and the tabs do not need to be exposed outside the shell, so that the tabs are protected, which helps to prolong the service life of the core. In addition, the multi-tab design can reduce the impedance of the core, realize the multi-rate charging and discharging function, and increase the heat dissipation area, which helps to dissipate heat of the core and is safe. In addition, the application is provided with rivets, which are used to fix the cap assembly by riveting compression to realize the functions of insulation and sealing. The components are embedded and connected with each other, the insulation and sealing effect is good, the overall structure is simple and effective, and the one-time forming does not need to be assembled, which is beneficial to large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0028] Figure 1 It is a perspective view of a square core of an embodiment of the application.

[0029] Figure 2 It is a front view of the square core of the application.

[0030] Figure 3 It is a sectional view of Figure 2 .

[0031] Figure 4 It is an enlarged view of the A area in Figure 3 .

[0032] Figure 5 It is an exploded view of the square core of the application.

[0033] Figure 6 It is a structure diagram of the cap assembly after insert injection molding.

[0034] Explanation of reference numerals in the drawings:

[0035] 1 - shell; 2 - winding core; 21 - tab; 211 - fitting part; 22 - vent hole; 3 - cap assembly; 31 - cover plate; 32 - insulating seat; 321 - connecting hole; 322 - embedding groove; 33 - connecting piece; 331 - first connecting part; 332 - second connecting part; 333 - linking part; 4 - rivet; 5 - first insulating pad; 51 - hollow hole; 6 - second insulating pad. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0038] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] Please refer to Figures 1 to 5 In a preferred embodiment, a square-shaped battery cell structure is provided, which comprises a shell 1, a winding core 2 and a cap assembly 3, the shell 1 has an accommodating cavity in the interior, an opening at the top, the winding core 2 is arranged in the accommodating cavity of the shell 1, the winding core 2 comprises a plurality of tabs 21, the tabs 21 are led out from the top end of the winding core 2, the cap assembly 3 is installed on the opening at the top of the shell 1, the cap assembly 3 comprises a cover plate 31, an insulating seat 32 and a plurality of connecting pieces 33, the insulating seat 32 is arranged through the cover plate 31 along the thickness direction of the cover plate 31, the connecting holes 321 are formed through the insulating seat 32 from top to bottom, a part of each connecting piece 33 is embedded in the insulating seat 32, the connecting piece 33 comprises a first connecting part 331 and a second connecting part 332 which are exposed outside the insulating seat 32, the first connecting part 331 and the second connecting part 332 are respectively located on the upper side and the lower side of the cover plate 31, each second connecting part 332 is connected with one tab 21, the rivet 4 is installed in the connecting hole 321, the rivet 4 is thickened at both ends by riveting, so as to press and fix the cap assembly 3 as a whole.

[0040] In the embodiment, the cap assembly 3 encapsulates the core 2 in the shell 1, after the cap assembly 3 is installed, the first connecting part 331 is located outside the shell 1, and the second connecting part 332 is located in the accommodating cavity inside the shell 1, wherein the connecting sheet 33 is made of conductive material, the insulating seat 32 is made of plastic material with insulation effect, a part of the connecting sheet 33 is embedded in the insulating seat 32, the connecting sheet 33 is separated from the cover plate 31 through the insulating seat 32, direct contact between the connecting sheet 33 and the cover plate 31 is avoided, insulation of the connecting sheet 33 is realized, the conductive effect of the connecting sheet 33 is ensured, and electric leakage is prevented, meanwhile, the cap assembly 3 can also seal the inside of the shell 1; specifically, the core 2 is provided with four tabs 21, correspondingly, the connecting sheet 33 is also provided with four tabs, the four tabs 21 are uniformly distributed at the top end of the core 2, and each tab 21 is connected with the second connecting part 332 of one connecting sheet 33, so that the core 2 is in conduction with the connecting sheet 33, the tab 21 can be directly powered from the outside through the connecting sheet 33, so that the battery charging and discharging is more flexible and convenient, in addition, the plurality of tabs 21 can reduce the impedance of the core, realize the multi-rate charging and discharging function, and increase the heat dissipation area, which is helpful for heat dissipation of the core; the connecting hole 321 is formed through the insulating seat 32 from top to bottom, the rivet 4 is installed in the connecting hole 321, the rivet 4 is thickened at both ends to form a rivet head, a relative constraint force is applied to the cap assembly 3 from top to bottom, so that the cap assembly 3 is tightly fixed.

[0041] Specifically, the rivet head of the thickened ends of the rivet 4 is in contact with the top of the insulating seat 32 and the bottom of the second connecting part 332 respectively, since the insulating seat 32 is made of insulating plastic material, it is not a rigid structure, in order to ensure the fixing effect of the rivet 4, the second connecting part 332 is located outside the insulating seat 32 as a whole, the top surface of the second connecting part 332 is attached to the bottom of the insulating seat 32, and the bottom surface is in abutment with the rivet head formed by thickening of the rivet 4, since the connecting sheet 33 is a rigid structure, the tight fixing effect can be effectively ensured.

[0042] It should be noted that the core 2 in the embodiment is provided with four tabs 21, correspondingly, the number of the connecting sheets 33 is correspondingly provided with four, the number of the connecting sheets 33 can be flexibly adjusted according to needs, and the exposed lengths of the first connecting part 331 and the second connecting part 332 can also be changed according to actual conditions, so as to realize the subsequent battery PACK process.

[0043] Please refer to Figures 1 to 4 In the embodiment, the connecting sheet 33 also includes a connecting part 333, the first connecting part 331 and the second connecting part 332 are connected through the connecting part 333, and the connecting part 333 is embedded in the inside of the insulating seat 32, so that the connecting sheet 33 is connected and fixed with the insulating seat 32.

[0044] Please refer to Figure 3 and Figure 4In the embodiment, the first connecting portion 331 is parallel to the second connecting portion 332, the connecting portion 333 is between the first connecting portion 331 and the second connecting portion 332, and the first connecting portion 331 and the second connecting portion 332 are connected perpendicularly to the connecting portion 333. Specifically, the connecting portion is connected perpendicularly to the end of the first connecting portion 331 and the second connecting portion 332, so that the connecting sheet 33 has a whole "F" shape.

[0045] It should be noted that, as shown in the figure, in order to ensure the stability of the first connecting portion 331 and prevent it from being easily bent by external force, a part of the first connecting portion 331 is located in the insulating seat 32.

[0046] Please refer to Figure 3 and Figure 4 In the embodiment, the first connecting portion 331 and the second connecting portion 332 are kept a gap from the surface of the cap. Since the cover plate 31 is made of metal and has a certain conductive capacity, by keeping a certain gap between the first connecting portion 331 and the second connecting portion 332 and the cap, direct contact between them is avoided, so as to ensure the conductive effect of the connecting sheet 33.

[0047] Please refer to Figure 3 and Figure 4 In the embodiment, a ring of embedding grooves 322 is arranged around the outer periphery of the insulating seat 32. A part of the cover plate 31 extends and is embedded into the embedding grooves 322 outside the insulating seat 32, so that the cover plate 31 and the insulating seat 32 are connected stably, the stability is improved, and the sealing performance of the cap assembly 3 is also improved, so as to ensure the sealing effect of the shell 1.

[0048] In the embodiment, the cap assembly 3 is an integral molding piece, which is integrally molded by the insert injection molding method, has strong firmness, and is formed at one time without the need of assembly work, so that the production is more convenient.

[0049] Specifically, please refer to Figure 6 The cover plate 31 and the connecting sheet 33 are embedded into the insulating seat 32 by injection molding, so that the cap assembly 3 is obtained. When the cap assembly 3 is initially molded, the second connecting portion 332 is collinear with the connecting portion 333. Then, the second connecting portion 332 is bent to be perpendicular to the connecting portion 333, so that the cap assembly 3 is obtained. Then, the rivet 4 is installed into the connecting hole 321, and finally the rivet 4 is riveted, so that the assembly and fixation of the cap assembly 3 are completed.

[0050] Please refer to Figure 3 and Figure 4In the embodiment, the first connecting part 331 is provided with the first insulating pad 5 in the gap of the cover plate 31, the first insulating pad 5 is provided with the hollow hole 51 for providing the space for the insulating seat 32, the size of the hollow hole 51 is matched with the size of the insulating seat 32, the hollow hole 51 is used for providing the space for the insulating seat 32, so that the first insulating pad 5 can be attached to the cover plate 31, when the battery generates an abnormality during the charging process, the winding core 2 in the shell 1 can be expanded, the first insulating pad 5 is used for preventing the second connecting part 332 from directly contacting the cover plate 31 when the winding core 2 is expanded, so as to avoid the occurrence of the electric leakage phenomenon, and the safety is improved.

[0051] It should be noted that the cap assembly 3 is formed by insert injection molding, in specific implementation, the cover plate 31 and the connecting piece 33 are used as inserts, and then the insulating seat 32 is formed by injection molding, so that the cap assembly 3 is obtained, wherein, when the cap assembly 3 is initially formed, the second connecting part 332 is collinear with the connecting part 333, as shown in the figure, at this time, the first insulating pad 5 is installed first, and then the second connecting part 332 is bent to be perpendicular to the connecting part 333, so that the cap assembly 3 is obtained, and then the cap assembly 3 is fixed by riveting through the rivet 4. Figure 6

[0052] Please refer to Figure 3 and Figure 4 In the embodiment, the end of the tab 21 is led out from the top of the winding core 2 and is bent to form the attaching part 211, the attaching part 211 is parallel to the second connecting part 332 and is attached to each other, so that the tab 21 is in conduction with the connecting piece 33, and the winding core 2 can be directly powered from the outside through the connecting piece 33.

[0053] Please refer to Figure 3 and Figure 6 In the embodiment, the second insulating pad 6 is attached to the bottom of the winding core 2, and the second insulating pad 6 is used for insulating and protecting the bottom of the winding core 2.

[0054] Specifically, the center of the winding core 2 is provided with the air hole 22, and correspondingly, the second insulating pad 6 is provided with the hole structure corresponding to the air hole 22.

[0055] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

[0056] ​In the description of the utility model, it is understood that the terms such as '' upper '', '' lower '', '' front '', '' rear '', '' left '', '' right '', '' vertical '', '' horizontal '', '' top '', '' bottom '' '' inner '', '' outer '' indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0057] In addition, the terms '' first '' and '' second '' are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0058] In the utility model, unless otherwise expressly specified and limited, the terms '' installation '', '' connection '', '' connection '', '' fixed '' and other terms should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated, 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 communication or interaction relationship between two elements inside 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.

Claims

1. A square cell structure, characterized by, The application relates to a battery cover cap assembly. The battery cover cap assembly comprises a shell, a winding core, a cover cap assembly and a rivet. The shell is internally provided with a containing cavity, and one end of the shell is provided with an opening. The winding core is arranged in the containing cavity and comprises a plurality of pole lugs. The cover cap assembly is arranged on the opening and comprises a cover plate, an insulating seat and a plurality of connecting pieces.

2. The square cell structure of claim 1, wherein, The insulating seat is arranged through the cover plate along the thickness direction of the cover plate.

3. The square cell structure of claim 2, wherein, The insulating seat is provided with a connecting hole along the thickness direction.

4. The square cell structure of claim 3, wherein, At least a part of each connecting piece is embedded in the insulating seat.

5. The square cell structure of claim 4, wherein, The connecting piece comprises a first connecting part and a second connecting part exposed outside the insulating seat.

6. The square cell structure of claim 1, wherein, The first connecting part and the second connecting part are respectively located on both sides of the cover plate along the thickness direction.

7. The square cell structure of claim 1, wherein, The second connecting part is connected with the pole lug.

8. The square cell structure of claim 1, wherein, The rivet is arranged in the connecting hole.

9. The square cell structure of claim 1, wherein, The rivet tightly presses and fixes the cover cap assembly as a whole through riveting.

10. The square cell structure of claim 1, wherein, The connecting piece further comprises a connecting part. The first connecting part and the second connecting part are connected through the connecting part. The connecting part is embedded in the inside of the insulating seat. The first connecting part and the second connecting part are parallel. The connecting part is perpendicular to the first connecting part and the second connecting part. The first connecting part and the second connecting part are both provided with a gap from the surface of the cover cap. The first connecting part is provided with a first insulating pad in the gap from the cover plate. The first insulating pad is provided with a hollow hole for accommodating the insulating seat. The insulating seat is provided with a surrounding embedded groove. The cover plate is extended around the insulating seat and embedded in the embedded groove. The cover cap assembly is an integral molding. The end of the pole lug is drawn out from one end of the winding core and is bent to form a fitting part. The fitting part is connected with the second connecting part. The battery cover cap assembly further comprises a second insulating pad. The second insulating pad is fitted on the end surface of the winding core away from the opening. The two ends of the rivet are respectively in contact with the insulating seat and the second connecting part.

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