CN210535701U - Secondary battery top cover - Google Patents
Secondary battery top cover Download PDFInfo
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- CN210535701U CN210535701U CN201921639835.6U CN201921639835U CN210535701U CN 210535701 U CN210535701 U CN 210535701U CN 201921639835 U CN201921639835 U CN 201921639835U CN 210535701 U CN210535701 U CN 210535701U
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- negative pole
- top cap
- mounting hole
- post
- secondary battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
The utility model provides a secondary battery top cap for the sealed casing that holds electric core, include: the top cover plate and positive post and the negative pole post that set up on the top cover plate, the top cover plate is equipped with negative pole post mounting hole, and the negative pole post encloses to be equipped with insulating part on the negative pole, and the negative pole post passes through insulating part insulation installation in negative pole post mounting hole on the negative pole, and the lower part of top cover plate is equipped with the recess of opening towards electric core around negative pole post mounting hole, insulating part embedding recess on the partial negative pole. The insulating part is directly adopted to carry out the sealing and insulation of the negative pole post and the top cover plate in the negative pole post mounting hole, a sealing ring component is cancelled, the secondary battery top cover is lighter and simpler, and the prepressing procedure of the sealing ring is reduced. During insulating part embedding top cap piece lower part's recess on the negative pole, the insulating part can play the effect of blockking on the negative pole that is located the recess, prevents effectively that gas from entering into negative pole post mounting hole and even the secondary battery top cap outside through top cap piece below to improve the leakproofness of secondary battery top cap greatly.
Description
Technical Field
The utility model relates to an energy storage apparatus field especially relates to a secondary battery top cap.
Background
In modern society, driving power sources for more and more electric tools and new energy vehicles are developed in a direction of high capacity and high safety, and batteries are widely used in electric tools and new energy vehicles due to their excellent characteristics such as high capacity. These batteries should have good safety in addition to high capacity to meet the standards of use and to meet the needs of people.
General secondary battery, in order to satisfy the electric insulation of utmost point post and top cap piece and casing, therefore can set up numerous insulating assemblies, like the insulating last insulating part of the part utmost point post that will stretch out the utmost point post hole and top cap piece, arrange utmost point post mounting hole in with utmost point post and top cap piece seal up and insulating rubber seal, and carry out insulating lower insulating part with electric core and top cap piece. In order to strictly control the air tightness of the top cover to meet the requirement of safe air tightness of the secondary battery, the mounting precision requirement is high, the sealing ring is pre-pressed, and gaps among all parts are strictly controlled, so that the cost is high and the yield is low. Therefore, at present, research is carried out to remove the sealing ring and replace the rubber sealing ring with plastic, so that the secondary battery top cover can be lighter and simpler, and the prepressing procedure of the sealing ring can be reduced. When only adopting last plastic to insulate, in order to improve sealed effect, can set up many apertures usually and carry out injection moulding, but the aperture shaping degree of difficulty is great, and the requirement is higher, if not shaping its gas-tight relatively poor, gaseous clearance circulation between each part through secondary cell top cap easily.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a secondary battery top cap to prior art's not enough, it not only can remove the sealing washer, can form the stronger injection structure of leakproofness moreover, avoids the big, the poor problem of gas tightness of the aperture injection moulding degree of difficulty.
In order to achieve the above object, the utility model provides a secondary battery top cap for the sealed casing that holds electric core, include: the top cover plate with set up in anodal post and negative pole post on the top cover plate, the top cover plate is equipped with negative pole post mounting hole, the negative pole post encloses and is equipped with the insulating part on the negative pole, the negative pole post passes through insulating part on the negative pole install in negative pole post mounting hole, the lower part of top cover plate centers on the negative pole post mounting hole be equipped with the opening towards the recess of electricity core, part insulating part embedding on the negative pole the recess.
The utility model discloses a secondary battery top cap directly adopts on the negative pole insulating part to carry out the negative pole post in the negative pole post mounting hole and the top cap piece sealed with insulating, therefore cancelled the sealing washer part, can make the secondary battery top cap more frivolous simple, reduces the pre-compaction process of sealing washer moreover. The lower part of top cap piece is equipped with the recess of opening towards electric core around negative pole post mounting hole, and insulating part embedding recess on partial negative pole, in insulating part embedding top cap piece lower part's recess on the negative pole promptly, thereby effectual packing when setting up of recess can making insulating part mould plastics on the negative pole increases the firm nature of connecting between the two. Simultaneously, when secondary cell inside produced gas, be located the negative pole in the recess on the insulating part can play the effect of blockking, prevent effectively that gas from entering into negative pole post mounting hole and even secondary cell top cap outside through top cap piece below to improve the leakproofness of secondary cell top cap greatly.
Furthermore, the side wall of the negative pole column is concave to form an annular groove, and part of the negative pole upper insulating part is embedded into the annular groove. The annular groove can ensure that the insulating part on the negative pole and the negative pole are connected more firmly, and the embedded part of the insulating part on the negative pole can block gas from passing through a gap between the negative pole and the insulating part on the negative pole.
Furthermore, the top cover plate is inwards concave towards the direction far away from the battery core to form a first boss, the first boss is provided with the negative pole column mounting hole, the lower surface of the first boss surrounds the concave part in the negative pole column mounting hole to form the groove, the arrangement of the boss can facilitate the installation of the negative pole column, and the firmness is stronger after the installation.
Furthermore, the groove is a semicircular, square, V-shaped, Z-shaped, W-shaped or M-shaped groove surrounding the cathode post mounting hole, that is, the cross section of the groove in the vertical direction is semicircular, square, V-shaped, Z-shaped, W-shaped or M-shaped, preferably V-shaped, Z-shaped, W-shaped or M-shaped, that is, the groove has a folded edge structure, so that the insulating part on the cathode can be filled more easily during injection molding, and the blocking effect of the insulating part on the cathode on gas can be better.
Further, insulating part has consecutive portion, intermediate part and the embedded portion that exposes on the negative pole, the portion that exposes encloses to locate the negative pole post and place in the upper portion of first boss, the intermediate part hold in negative pole post mounting hole, and enclose to locate the negative pole post will the negative pole post with the top cap piece is kept apart, the embedded portion is located the lower part and the partial embedding of first boss the recess.
Furthermore, the upper surface of the first boss is provided with a plurality of notches communicated with the negative pole column mounting holes, and the middle part of the first boss is provided with a protruding part embedded into the notches, so that the middle part of the first boss can be connected with the top cover plate more firmly.
Furthermore, the upper surface of first boss in the notch is kept away from one side of negative pole post mounting hole is equipped with a plurality of blind hole, the portion downwardly extending that exposes forms a plurality of embedding the extension of blind hole, it not only can make the portion that exposes be connected more firmly with the top cap piece, can also play the purpose of preventing rotating to avoid secondary battery to exert pressure and produce relative movement to the negative pole post when equipment or performance are examined.
Further, a lower negative electrode insulating part for isolating the top cover plate from the battery core is arranged below the top cover plate, the lower negative electrode insulating part is provided with a clamping part, and the clamping part extends into the lower part of the first boss and is clamped on the negative electrode column.
Further, joint portion is fixed in embedded portion, still further, embedded portion has the embedding portion of recess and being located the body of first boss below, the body has the inclined plane, the inclined plane the body with the embedding portion encloses and establishes into and holds the chamber, joint portion card is located hold the chamber. Through the holding cavity with a complex structure, the embedding of the upper insulating part and the lower insulating part of the negative electrode is firmer.
Further, the top cap piece still is equipped with the anodal post mounting hole, the anodal post encloses and is equipped with anodal insulating part, the anodal post install in the anodal post mounting hole, the lower part of top cap piece centers on the anodal post mounting hole be equipped with the opening towards the recess of electricity core, part anodal insulating part embedding the recess, the positive terminal and the negative pole end of top cap piece are symmetrical structure promptly.
Drawings
Fig. 1 is a front view of an embodiment of a secondary battery top cap according to the present invention.
Fig. 2 is a top view of an embodiment of a secondary battery top cap according to the present invention.
Fig. 3 is a bottom view of an embodiment of a secondary battery top cap according to the present invention.
Fig. 4 is an exploded view of the secondary battery top cover of the present invention in a first direction.
Fig. 5 is an exploded view of the secondary battery top cover according to the present invention in the second direction.
Fig. 6 is a cross-sectional view taken along a-a of fig. 2.
Fig. 7 is a cross-sectional view taken along the line B-B in fig. 2.
Fig. 8 is an enlarged view of the circled portion in fig. 6.
Figure 9 is an enlarged view of the top flap of figure 4.
Figure 10 is an enlarged view of the top flap of figure 5.
Fig. 11 is an enlarged view of the insulating member on the negative electrode in fig. 4.
Fig. 12 is an enlarged view of the insulating member on the negative electrode in fig. 5.
Fig. 13 is a cross-sectional view in the direction C-C of fig. 11.
Fig. 14 is a variation of fig. 13. Fig. 15 is still another variation of fig. 13.
Fig. 16 is a further variation of fig. 13.
Description of the elements
100-secondary battery top cover; 10-a top cover sheet; 110-negative pole post mounting holes; 120-positive post mounting hole; 130-a first boss; 1310-notches; 1330-a blind hole; 1350/1350' -grooves; 140-explosion proof valve mounting hole; 20-positive pole column; 30-a negative pole post; 310-an upper terminal portion; 3110-annular groove; 330-lower terminal portion; 40-an explosion-proof valve assembly; 410-an explosion-proof valve; 430-explosion-proof valve protection sheet; 50-liquid injection hole; 60-a negative upper insulator; 610-an exposed part; 6110-extension; 6130-engaging part; 630-an intermediate portion; 6310-boss; 650-an inset; 6510-body; 6530-an insert; 60' -an upper insulator of positive pole; 70-a negative lower insulator; 710-a snap-in part; 70' -a positive electrode lower insulator;
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that, in general, the secondary battery is placed vertically, one side of the secondary battery top cover, which extends out of the pole and is connected with the outside, is an upper side, the other side is a lower side, the direction between the two poles is defined as the length direction, and the up-and-down direction is defined as the thickness/height direction.
The utility model discloses a secondary battery top cap can be used to the sealed casing and prepares secondary battery, and the secondary battery top cap can weld with the casing and seal. Referring to fig. 1 to 10, a secondary battery top cap 100 includes a top cap 10, and a positive pole post 20 and a negative pole post 30 disposed on the top cap 10, the top cap 10 is provided with an explosion-proof valve assembly 40 and a liquid injection hole 50, and a positive pole lower insulator 70' and a negative pole lower insulator 70 are disposed below the top cap 1 for electrically insulating the top cap 10 from a cell in a case (not shown in the figure). The explosion-proof valve assembly 40 includes an explosion-proof valve 410 provided on the top cover sheet 10 and an explosion-proof valve protection sheet 430 provided above the explosion-proof valve 410. The top cover plate 10 is respectively provided with a positive pole mounting hole 120, a negative pole mounting hole 110 and an explosion-proof valve mounting hole 140, the explosion-proof valve 410 is fixed in the explosion-proof valve mounting hole 140, and the positive pole 20 and the negative pole 30 are respectively mounted in the positive pole mounting hole 120 and the negative pole mounting hole 110. The positive post 20 and the negative post 30 may be the same or different and both may be electrically insulated from the top cover piece 10, or the negative post 30 may be electrically insulated from the top cover piece 10 with the positive post 20 electrically connected to the top cover piece 10. The positive terminal and the negative terminal will be described in more detail below, respectively.
First, describing the structure of the secondary battery top cover 100 at the negative electrode end, referring to fig. 4 to 13, the negative pole column 30 is surrounded by the negative pole upper insulating member 60, the negative pole column 30 is mounted in the negative pole column mounting hole 110 through the negative pole upper insulating member 60 in an insulating manner, the lower portion of the top cover plate 10 is provided with a groove 1350 with an opening facing the battery core around the negative pole column mounting hole 110, and a part of the negative pole upper insulating member 60 is embedded in the groove 1350. The groove 1350 is a V-shaped groove surrounding the cathode pillar mounting hole 110, and the V-shaped groove can be used for filling the insulation member 60 on the cathode more easily during injection molding, and the V-shaped groove can be used for ensuring that the insulation member 60 on the cathode has a better blocking effect on gas. Of course, the groove 1350 may be W-shaped as shown in FIG. 14, square-shaped as shown in FIG. 15, or a plurality of semicircular shapes as shown in FIG. 16, and it is not limited to the structures shown in FIGS. 13 to 16, and may be other structures such as Z-shaped or M-shaped. The side wall of the negative electrode tab 30 is recessed to form an annular groove 3110, and a portion of the negative electrode upper insulator 60 is fitted into the annular groove 3110. The annular groove 3110 is provided not only to make the connection between the negative electrode upper insulator 60 and the negative electrode post 30 more secure, but also to block the gas from passing through the gap between the negative electrode post 30 and the negative electrode upper insulator 60 by the embedded portion of the negative electrode upper insulator 60.
Continuing as shown in fig. 9 to 10, the top cover plate 10 is recessed inward in a direction away from the battery core to form a first boss 130, the first boss 130 is provided with a negative pole mounting hole 110, the lower surface of the first boss 150 is recessed inward around the negative pole mounting hole 110 to form a groove 1350, the arrangement of the boss 150 can facilitate the installation of the negative pole 30, and the firmness after installation is stronger. The upper surface of the first boss 130 is provided with a plurality of notches 1310 communicated with the negative pole mounting holes 110, the upper surface of the first boss 130 is provided with a plurality of blind holes 1330 at one side of the notches 1310 far away from the negative pole mounting holes 110, and the notches 1310 and the blind holes 1330 are arranged so that the connection between the top cover plate 10 and the negative pole upper insulator 60 is firmer.
As shown in fig. 11 to 13, the negative electrode upper insulator 60 has an exposed portion 610, an intermediate portion 630 and an embedded portion 650 connected in sequence, the exposed portion 610 surrounds the negative electrode pillar 30 and is disposed on the upper portion of the first boss 130, the intermediate portion 630 is received in the negative electrode pillar mounting hole 110 and surrounds the negative electrode pillar 30 and separates the negative electrode pillar 30 from the top cover plate 10, and the embedded portion 650 is disposed on the lower portion of the first boss 130 and is partially embedded in the groove 1350. The middle portion 630 has a protrusion 6310 that fits into the notch 1310 of the first boss 130, and the protrusion 6310 is disposed to make the middle portion 630 and the top cover sheet 10 connected more firmly. The exposed portion 610 extends downward to form a plurality of extending portions 6110, the plurality of extending portions 6110 are embedded into the blind holes 1330 of the first bosses 130, and the blind holes 1330 are arranged, so that the exposed portion 610 and the top cover plate 10 can be connected more firmly, and the purpose of preventing rotation can be achieved, so that the negative pole posts 30 are prevented from being pressed to move relatively when the secondary battery is assembled or performance is detected. The exposed portion 610 is further provided with a clamping portion 6130, and the clamping portion 6130 is embedded into the annular groove 3110 of the negative pole post 30, so that the negative pole upper insulator 60 and the negative pole post 30 are connected more firmly.
Further, as shown in fig. 6 to 8, the negative lower insulating member 70 has a clamping portion 710, and the clamping portion 710 extends into the lower portion of the first boss 130 and is clamped on the negative post 30. The embedded part 650 of the negative electrode upper insulator 60 has a body 6510 positioned below the first boss 130 and an embedded part 6530 embedded in the groove 1350, and the cross section of the embedded part 6530 is triangular to match the groove 1350 of the V-shape. The body 6510 has an inclined surface, the body 6510 and the embedding part 6530 are enclosed to form an accommodating cavity, and the clamping part 710 is clamped in the accommodating cavity. The negative electrode upper insulator 60 and the negative electrode lower insulator 70 can be more firmly fitted by forming the receiving cavity having a complicated structure.
Secondly, a structure of the secondary battery top cover at the positive electrode end is described in detail, referring to fig. 1 to 6, the positive electrode end and the negative electrode end can have the same structure, similarly, the positive electrode pillar 20 is surrounded by the positive electrode insulator 60 ', the positive electrode pillar 20 is mounted in the positive electrode pillar mounting hole 120 through the positive electrode insulator 60 ', the lower portion of the top cover piece 10 is provided with a groove 1350 ' with an opening facing the battery core around the positive electrode pillar mounting hole 120, a part of the positive electrode insulator 60 ' is embedded in the groove 1350 ', and the rest of the same parts are not described again. However, in order to solve the problems of overcharge and puncture of the secondary battery during the use of the secondary battery, the positive electrode tab 20 is electrically connected to the top cap sheet 10 to form an external short circuit, and thus, when the positive electrode terminal is injection-molded, conductive particles, such as conductive carbon or conductive metal, may be added to the injection-molded material to electrically connect the positive electrode tab 20 to the top cap sheet 10. Of course, the positive terminal and the negative terminal may have different structures, and the structure of the local positive terminal may be adjusted to make the two terminals not completely symmetrical, as required by actual conditions. Meanwhile, if the height of the boss formed at the positive electrode end of the top cover 10 is extended, the boss formed at the positive electrode end can be directly used as the positive electrode post 20, and the insulator 60' on the positive electrode can be omitted.
The utility model discloses a secondary cell top cap 100 directly adopts on the negative pole insulating part 60 to carry out negative pole post 30 and top cap piece 10 sealed and insulating in the negative pole post mounting hole 110, therefore cancelled the sealing washer part, can make secondary cell top cap 100 more frivolous simple, reduces the pre-compaction process of sealing washer moreover. The lower part of the top cover plate 10 is provided with a groove 1350 with an opening facing the battery core around the negative pole mounting hole 110, and part of the negative pole upper insulator 60 is embedded into the groove 1350, namely, the negative pole upper insulator 60 is embedded into the groove 1350 at the lower part of the top cover plate 10, and the arrangement of the groove 1350 can effectively fill the negative pole upper insulator 60 during injection molding, so that the connection firmness between the two parts is improved. Meanwhile, when gas is generated inside the secondary battery, the insulating member 60 on the negative electrode positioned in the groove 1350 may play a role of blocking, which effectively prevents gas from entering the negative electrode post mounting hole 110 through the lower part of the top cover plate 10 and even the outside of the top cover of the secondary battery, thereby greatly improving the sealing property of the top cover 100 of the secondary battery.
It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that modifications of various equivalent forms of the invention, which may occur to those skilled in the art after reading the present application, fall within the scope of the appended claims.
Claims (10)
1. A secondary battery top cap for hermetically housing a cell, comprising: the top cover plate with set up in anodal post and negative pole post on the top cover plate, the top cover plate is equipped with negative pole post mounting hole, its characterized in that, the negative pole post encloses and is equipped with the insulating part on the negative pole, the negative pole post passes through insulating part on the negative pole install in negative pole post mounting hole, the lower part of top cover plate centers on the negative pole post mounting hole be equipped with the opening towards the recess of electricity core, part insulating part embedding on the negative pole the recess.
2. The secondary battery top cap according to claim 1, wherein the side wall of the negative post is recessed to form an annular groove, and a portion of the negative upper insulator is inserted into the annular groove.
3. The secondary battery top cap of claim 1, wherein the top cap piece is recessed inward in a direction away from the battery core to form a first boss, the first boss is provided with the negative pole mounting hole, and the lower surface of the first boss surrounds the negative pole mounting hole to form the groove.
4. The secondary battery top cap according to claim 3, wherein the groove is a V-shaped, Z-shaped, W-shaped, M-shaped groove surrounding the negative post mounting hole.
5. The secondary battery top cap according to claim 3, wherein the negative electrode upper insulator has an exposed portion, an intermediate portion and an embedded portion connected in sequence, the exposed portion is disposed around the negative electrode post and disposed on the upper portion of the first boss, the intermediate portion is received in the negative electrode post mounting hole and disposed around the negative electrode post and separates the negative electrode post from the top cap piece, and the embedded portion is disposed on the lower portion of the first boss and partially embedded in the groove.
6. The secondary battery top cap according to claim 5, wherein the upper surface of the first boss is provided with a plurality of notches communicating with the negative post mounting hole, and the middle portion has a protrusion fitting into the notches.
7. The secondary battery top cap of claim 6, wherein the upper surface of the first boss is provided with a plurality of blind holes at a side of the notch away from the negative pole mounting hole, and the exposed portion extends downward to form a plurality of extending portions embedded in the blind holes.
8. The secondary battery top cap of claim 5, wherein a negative lower insulator is arranged below the top cap piece and used for isolating the top cap piece from the battery core, the negative lower insulator is provided with a clamping portion, and the clamping portion extends below the first boss and is clamped on the negative pole column.
9. The secondary battery top cap of claim 8, wherein the embedded portion has an embedded portion embedded in the groove and a body located under the first boss, the body has an inclined surface, the body and the embedded portion enclose an accommodating cavity, and the clamping portion is clamped in the accommodating cavity.
10. The secondary battery top cap according to any one of claims 1 to 9, characterized in that the top cap piece is further provided with a positive post mounting hole, the positive post is surrounded by a positive pole upper insulator, the positive post is mounted in the positive post mounting hole, the lower part of the top cap piece is provided with a groove with an opening facing the battery core around the positive post mounting hole, and part of the positive pole upper insulator is embedded in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921639835.6U CN210535701U (en) | 2019-09-27 | 2019-09-27 | Secondary battery top cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921639835.6U CN210535701U (en) | 2019-09-27 | 2019-09-27 | Secondary battery top cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210535701U true CN210535701U (en) | 2020-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921639835.6U Active CN210535701U (en) | 2019-09-27 | 2019-09-27 | Secondary battery top cover |
Country Status (1)
| Country | Link |
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| CN (1) | CN210535701U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838301A (en) * | 2021-02-03 | 2021-05-25 | 湖北亿纬动力有限公司 | Battery top cover, battery and battery preparation process |
| CN112993494A (en) * | 2021-04-16 | 2021-06-18 | 湖北亿纬动力有限公司 | Battery top cap and battery |
| CN114361689A (en) * | 2021-11-23 | 2022-04-15 | 宁波震裕汽车部件有限公司 | Top cover structure of power battery |
-
2019
- 2019-09-27 CN CN201921639835.6U patent/CN210535701U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838301A (en) * | 2021-02-03 | 2021-05-25 | 湖北亿纬动力有限公司 | Battery top cover, battery and battery preparation process |
| CN112993494A (en) * | 2021-04-16 | 2021-06-18 | 湖北亿纬动力有限公司 | Battery top cap and battery |
| CN114361689A (en) * | 2021-11-23 | 2022-04-15 | 宁波震裕汽车部件有限公司 | Top cover structure of power battery |
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