Detailed Description
The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.
In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.
The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.
Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.
An embodiment of the utility model provides a battery cover plate subassembly, please refer to fig. 1 to fig. 4, battery cover plate subassembly includes apron body, utmost point post and electrode connection piece, and utmost point post setting is on the apron body, and the electrode connection piece is used for being connected the utmost point ear electricity on utmost point post, and the electrode connection piece includes: the first connecting part 10, the first connecting part 10 is used for connecting with the pole ear; the second connecting part 20, the second connecting part 20 is connected with the pole; the safety part 30, two ends of the safety part 30 are respectively connected with the first connecting part 10 and the second connecting part 20, and the cross-sectional areas of the first connecting part 10 and the second connecting part 20 are larger than that of the safety part 30; the safety portion 30 is a bent plate.
The utility model discloses a battery cover plate subassembly is through the cross-sectional area that makes the safety part 30 of electrode connection piece be less than first connecting portion 10 and second connecting portion 20, safety part 30 is narrowest, the electric current of safety part 30 is great for first connecting portion 10 and second connecting portion 20 promptly, when the circuit appears the extreme condition such as short circuit, safety part 30 just can generate heat and fuse through self, with the electric current between utmost point ear and the utmost point post breaks off rapidly, cut off the electric current return circuit, thereby play the effect of protection battery. And because the safety part 30 is a bent plate, after the safety part 30 is fused, because the connecting sheets at two ends of the fused part are bounced apart for a certain distance through residual internal stress, secondary arc discharge at two ends of the fused part is prevented, and the use safety of the battery is improved.
In some embodiments, the first connecting portion 10 has a first connecting side 11, the second connecting portion 20 has a second connecting side 23, two ends of the securing portion 30 are respectively connected to the first connecting side 11 and the second connecting side 23, and the areas of the first connecting side 11 and the second connecting side 23 are larger than the cross-sectional area of the securing portion 30.
The electrode connecting sheet is used for electrically connecting a tab of the battery cell and a pole of the battery cover plate assembly. In some embodiments, the electrode tabs may be welded directly to the tabs, and the electrode tabs may be welded or riveted directly to the posts. Specifically, the first connection portion 10 is connected to a tab, and the second connection portion 20 is connected to a pole.
The areas of the first connecting side 11 and the second connecting side 23 are larger than the cross-sectional area of the fuse 30, that is, the cross-sectional area of the fuse 30 is smaller than the cross-sectional areas of the first connecting portion 10 and the second connecting portion 20, so that the fuse 30 can be the narrowest part of the electrode connecting piece, thereby ensuring that the fuse 30 is most easily fused.
Since the securing part 30 is a bent plate, that is, relatively large internal stress is generated inside the securing part 30, after the securing part 30 is broken, the distance between the first connecting part 10 and the second connecting part 20 is increased by the residual internal stress, thereby preventing the possibility of reconnection.
It should be noted that the safety portion 30 is a bent plate, and it can be understood that a straight plate is bent to form a bent plate, and the bent portion of the bent plate may be an arc transition or a sharp transition, similar to a V-shaped structure.
In one embodiment, the fuse 30 is an arc-shaped plate, that is, the fuse 30 may be an arc-shaped plate, and since the arc-shaped plate is prone to generate internal stress, the electrode connecting sheet is more prone to generate a spring-open phenomenon after the fuse 30 is fused, so as to prevent the two ends of the fracture from being secondarily arc-drawn.
In some embodiments, the safety portion 30 is an arc-shaped plate, and the bending portion of the arc-shaped plate can be an arc transition, so that the structural strength of the safety portion is good, bending cracks are avoided, and safety pop-up after fusing can be ensured.
In one embodiment, as shown in fig. 1, the safety part 30 includes a safety unit 31, and the safety unit 31 includes: a first plate section 311, the first plate section 311 being connected to the first connection portion 10; a second plate section 312, the second plate section 312 being connected to the second connection portion 20; a middle plate section 313, wherein two ends of the middle plate section 313 are respectively connected with the first plate section 311 and the second plate section 312; the cross-sectional areas of the first plate section 311 and the second plate section 312 are both larger than the cross-sectional area of the middle plate section 313, that is, the middle plate section 313 is the narrowest part of the fuse part 30, so that the fuse is easier to fuse, and after the middle plate section 313 is fused, the first plate section 311 and the second plate section 312 spring away from each other in the direction of departing under the action of residual internal stress, so that the distance between the first plate section 311 and the second plate section 312 is increased, and the electrode connecting sheet is ensured to have sufficient safety protection performance.
Specifically, the first plate section 311, the middle plate section 313 and the second plate section 312 form the safety unit 31, the middle plate section 313 is an arc-shaped transition section of the safety portion 30, and the cross-sectional area of the middle plate section 313 is smaller than the cross-sectional areas of the first plate section 311 and the second plate section 312, that is, the middle plate section 313 may be subjected to material removal by machining, or when the electrode connecting sheet is bent, the material at the bent position may be extruded to both sides, so that the middle plate section 313 is thinnest. How to minimize the cross-sectional area of the middle plate section 313 is not limited herein, and the corresponding process may be performed according to actual operation.
In one embodiment, as shown in fig. 1, there are at least two fuse units 31, and two adjacent fuse units 31 are spaced apart from each other to form a through hole 32 between the two adjacent fuse units 31, where the through hole 32 is actually a weakened hole formed on the electrode connecting piece, so that the fuse portion 30 can be firstly fused to perform a safety protection function.
Specifically, a plurality of fuse units 31 are connected between the first connection portion 10 and the second connection portion 20 at intervals, and a current is relatively large at each fuse unit 31, so that fusing is more likely to occur.
It should be noted that the structures of the plurality of safety units 31 may be identical, and of course, it is not excluded that the structures of the safety units 31 have relatively small differences, and the structures may be determined according to the actual molding process, and are not limited herein. The connecting position of the safety unit 31 to the first connecting side 11 and the second connecting side 23 is not limited herein and can be selected according to actual requirements.
In this embodiment, there are two fuse units 31, and the two fuse units 31 are respectively connected to two ends of the first connection portion 10. In some embodiments, the width of the first connecting portion 10 is smaller than the width of the second connecting portion 20, and the two safety units 31 are respectively connected to two ends of the first connecting portion 10, that is, the outer edges of the two safety units 31 may be in a plane with two outer edges of the first connecting portion 10, and the plane of the outer edges of the two safety units 31 is clamped in the plane of the two outer edges of the second connecting portion 20.
In some embodiments, referring to fig. 1 and 2, each fuse unit 31 includes a first plate section 311, an intermediate plate section 313, and a second plate section 312, the first plate section 311 is gradually narrowed from one end connected to the first connection portion 10 to the intermediate plate section 313, the second plate section 312 is gradually narrowed from one end connected to the second connection portion 20 to the intermediate plate section 313, and the intermediate plate section 313 is the narrowest section, when the through hole 32 is formed between two adjacent fuse units 31, two end surfaces of the through hole 32 are arc-shaped surfaces and are outwardly concave, that is, similar to a U shape.
In one embodiment, the safety unit 31 may have a dumbbell shape or other shape, and the through hole 32 has an oval shape or other shape.
In one embodiment, as shown in fig. 1, the vertical distance from the top end of the safety part 30 to the bottom end of the safety part 30 is a, the distance between the two ends of the safety part 30 is b, and a/b is greater than or equal to 1/3 and less than or equal to 2/3, i.e. the overall height of the safety part 30 is less than the overall width of the safety part 30, and the above distance ratio can ensure the structural strength of the safety part 30 itself and the internal stress inside the safety part 30, thereby ensuring that the safety part 30 can be ejected after being fused.
Specifically, the distance b between the two ends of the safety part 30 can be further explained as the distance b between the first connection side 11 and the second connection side 23.
In some embodiments, a/b is 1/3, a/b is 1/2, and a/b is 2/3.
It should be noted that a/b is greater than or equal to 1/3 and is less than or equal to 2/3, on one hand, a molten bag at a fusing port is close to a sphere and is smooth, and port burrs are not easy to generate to prevent secondary overlapping; on the other hand, due to the existence of thermal stress, the arch height is in the range, the stress is larger, the bouncing distance after disconnection is the largest, the occupied space is smaller, and the space utilization rate in the battery cannot be influenced.
It should be noted that the tab of the battery cell includes two modes, that is, a mode of tab emergence from the top of the battery cell, and a mode of tab emergence from the side of the battery cell. Because the battery cover plate assembly is located at the top of the battery core, when the tab is formed at the top of the battery core, the first connecting portion 10 and the second connecting portion 20 may both be located at the top of the battery core, that is, the first connecting portion 10 and the second connecting portion 20 may be located on the same plane, or only have a certain upper and lower position difference, but are located at the top of the battery core as a whole. When the side of the battery cell is exposed from the tab, at least a part of the first connecting portion 10 needs to be located at the side of the battery cell to connect with the tab, and the second connecting portion 20 is located at the top of the battery cell to connect with the terminal. The electrode connecting piece in this embodiment may be any one of the above, and it is only necessary to secure the corresponding structure of the securing portion 30.
In one embodiment, the second connecting portion 20 is a straight plate, the first connecting portion 10 includes a first plate 12 and a second plate 13, and an included angle is formed between the first plate 12 and the second plate 13; the first plate body 12 is parallel to the second connection portion 20, that is, the electrode connection piece is used to connect the tab at the side of the battery cell, and at this time, the first connection portion 10 is integrally L-shaped, so as to ensure that the second plate body 13 can be connected with the tab.
Specifically, the first plate 12, the safety portion 30 and the second connection portion 20 are located at the top of the battery cell, the second plate 13 is located at the side of the battery cell, and the safety portion 30 is connected between the first plate 12 and the second connection portion 20.
In one embodiment, the thickness of each of the first connecting portion 10 and the second connecting portion 20 is greater than that of the fuse portion 30, i.e., the thickness of the fuse portion 30 is thinnest, so that the fuse portion 30 can be guaranteed to be fused first.
In one embodiment, as shown in fig. 1, the second connecting portion 20 is provided with a positioning hole 22, and the positioning hole 22 is used for fixing the electrode connecting sheet and the electrode post.
In one embodiment, as shown in fig. 3 and 4, the battery cover plate assembly further includes: filler 40, filler 40 sets up between apron body and insurable part 30, the department of buckling of insurable part 30 is towards electric core promptly, and apron body and filler 40 are located the top of insurable part 30, filler 40 is filled between apron body and insurable part 30 this moment, thereby can apply the power towards electric core direction for insurable part 30, after insurable part 30 breaks off, filler 40 can outwards bulge, thereby can make the both ends face of insurable part 30 disconnection further outwards pop out, thereby further avoided the problem that the arc was drawn to the fracture both ends secondary.
It should be noted that, the electrode connecting sheet and the cover plate body are arranged in an insulating manner, and in this case, an insulating layer may be coated on the cover plate body to replace the insulating member in the related art.
In one embodiment, the filling member 40 is disposed on the fuse portion 30, and further, the filling member 40 may be disposed in the through hole 32, and the filling member 40 may apply opposite forces to the first connecting portion 10 and the second connecting portion 20, respectively, so that the filling member 40 may prevent the two broken ends of the fuse portion 30 from contacting after the fuse portion 30 is broken.
In one embodiment, the packing 40 and the insulator 50, the insulator 50 is disposed between the cap body and the electrode connection tab, and the packing 40 is disposed between the insulator 50 and the fuse 30.
Compared with the above embodiment, the present embodiment is different in that the insulating member 50 is disposed between the cover body and the filling member 40, and the filling member 40 is sandwiched between the insulating member 50 and the safety portion 30, so that the functions of the present embodiment are the same, and the two end surfaces of the safety portion 30 that are disconnected can be further flicked.
In one embodiment, the filling member 40 is an elastic member, that is, the safety portion 30 will compress the elastic member to some extent, so that after the safety portion 30 is broken, the elastic member will return to the original state, and at this time, the elastic member will push the safety portion 30 to spring open.
It should be noted that the filling member 40 may be a whole, i.e. a complete filling member 40 presses each safety unit 31 of the safety portion 30. Of course, the filling element 40 can also be composed of a plurality of individual segments, i.e. each individual segment presses against a respective securing unit 31. Further, the filler 40 presses the middle plate section 313 of the safety unit 31.
An embodiment of the utility model also provides a battery, including foretell battery cover plate subassembly.
The utility model discloses a battery is through making the cross-sectional area of the insurance portion 30 of electrode connection piece be less than the cross-sectional area of first connecting portion 10 and second connecting portion 20, insurance portion 30 is narrowest, the electric current of insurance portion 30 is great for first connecting portion 10 and second connecting portion 20 promptly, when the circuit appears the extreme condition such as short circuit, insurance portion 30 just can generate heat and fuse through self, with the electric current between utmost point ear and the utmost point post breaks off rapidly, cut off the electric current return circuit, thereby play the effect of protection battery. And because the safety part 30 is a bent plate, after the safety part 30 is fused, because the connecting sheets at two ends of the fused part are bounced apart for a certain distance through residual internal stress, secondary arc discharge at two ends of the fused part is prevented, and the use safety of the battery is improved.
In one embodiment, the battery further comprises a cell, and a tab of the cell is connected to the first connection portion 10 of the electrode connection tab.
In some embodiments, the first connection portion 10 of the electrode connection tab may be connected with the tabs of two cells, or the first connection portion 10 may be connected with the tab of one cell.
In one embodiment, the pole is welded or riveted to the second connection 20 of the electrode connection tab. The battery cover plate assembly is positioned at the top end of the battery core, and the first connecting part 10 of the electrode connecting sheet is welded with the lug of the battery core.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.