CN116845505A - Connection piece and battery - Google Patents

Abstract

The invention relates to the technical field of batteries, and discloses a connecting sheet and a battery, wherein the connecting sheet comprises: one side of the connecting sheet body is electrically connected with the pole group; the connecting part is arranged on one side of the connecting sheet body, which is far away from the pole group, and protrudes out of the surface of the connecting sheet body, and the connecting part is suitable for being electrically connected with the pole; the connecting piece body forms a connecting rib, and the connecting rib is suitable for breaking when the air pressure in the battery reaches a preset value so as to disconnect the electrode post from the electrode group. When the air pressure in the battery reaches a certain value, the connecting ribs with weaker strength are firstly broken, the connecting parts and the polar posts are integrally sprung out under the action of the air pressure, the smoothness of exhaust is improved, and the connection between the battery and an external circuit can be cut off in time.

Description

Connection piece and battery

Technical Field

The invention relates to the technical field of batteries, in particular to a connecting sheet and a battery.

Background

Along with the increasing maturity of battery technology, power batteries are widely applied to electric automobiles, and the requirements on the usability and safety of the power batteries are increasing. The power battery has the risks of thermal runaway and the like, when abnormal conditions such as short circuit and the like occur in the battery, the gas pressure in the battery is increased, and if high-temperature smoke in the battery is not discharged in time, serious safety accidents such as battery explosion and the like can occur. In view of the above, in the prior art, an explosion-proof valve is provided on a casing, and high-temperature smoke in a battery is discharged through explosion of the explosion-proof valve.

However, the explosion-proof valve is usually directly arranged on the surface of the shell, parts such as a connecting sheet and the like arranged between the electrode group and the shell in the battery can generate certain obstruction to the circulation of gas, the ventilation is influenced, and when thermal runaway occurs, the battery is usually connected to a circuit, if the connection with the circuit cannot be timely disconnected, the short circuit damage of the whole circuit can be caused, and the loss is further increased.

Disclosure of Invention

In view of the above, the present invention provides a connecting piece and a battery, so as to solve the problems that the gas flow inside the battery is blocked and the circuit cannot be cut off in time during thermal runaway.

In a first aspect, the present invention provides a connecting piece comprising: one side of the connecting sheet body is electrically connected with the pole group; the connecting part is arranged on one side, far away from the pole group, of the connecting piece body, protrudes out of the surface of the connecting piece body, and is suitable for being electrically connected with the pole column; the connecting piece body is provided with a plurality of vent holes, the vent holes are arranged at intervals, the circular ring formed by surrounding the vent holes corresponds to the pole, the connecting piece body between two adjacent vent holes forms a connecting rib, and the connecting rib is suitable for being broken when the air pressure in the battery reaches a preset value so as to enable the pole to be disconnected with the pole group.

Through set up a plurality of spaced air vents on the connection piece body, and a plurality of air vents enclose into the ring, form the joint bar between every adjacent two air vents, the intensity of joint bar is less than the intensity of connection piece body, when the atmospheric pressure in the battery reaches a definite value, the joint bar that intensity is weaker is fracture at first, then the connecting portion in the middle of the ring that a plurality of air vents enclose drops from the connection piece body, the area of ventilating of increase connection piece, avoid the connection piece to cause the hindrance to the gas flow, and because the ring that a plurality of air vents enclose is corresponding with the utmost point post, then under the effect of the gas pressure in the battery, connecting portion and the utmost point post that is connected with connecting portion can wholly spring out under the effect of gas pressure, break away from the battery, thereby improve the unobstructed nature of exhaust, prevent that the battery from exploding, and after the utmost point post breaks away from the battery, can in time cut off the battery and external circuit's connection, thereby avoid causing the short circuit damage to whole circuit, improve the security.

In an alternative embodiment, the distance between the centers of two adjacent ventilation holes is in the range of 0.8mm to 1.2mm. The strength of the connecting sheet 3 can be ensured, and the connecting rib 304 can be broken in time when the air pressure in the battery reaches a preset value, so that the safety of the battery is ensured.

In an alternative embodiment, the connecting part is in a cylindrical shape, the diameter of the cylindrical shape is D1, the diameter of a circular ring surrounded by a plurality of vent holes is D2, wherein D2/D1 is less than or equal to 1.25 and less than or equal to 2.75, so that the exhaust effect can be ensured, the overcurrent capacity between the electrode group 2 and the connecting sheet 3 is not influenced, and the battery performance is ensured;

and/or the diameter of the circular ring surrounded by the vent holes ranges from 3.5mm to 16mm, so that the overcurrent capacity between the connecting sheet 3 and the pole 5 can be ensured, the overcurrent capacity between the connecting sheet 3 and the pole group 2 can be ensured, and the performance of the battery is improved to the greatest extent.

In an alternative embodiment, the thickness of the connecting piece body is 0.4mm. The welding effect and the product strength can be ensured, and the overcurrent capacity of the product can be met.

In a second aspect, the present invention also provides a battery comprising: a housing; a pole set disposed within the housing; the pole is arranged at one end of the shell, the pole is connected with the shell in an insulating way, and an explosion-proof breaking position is formed on the shell around the pole; the connecting piece is arranged between the pole post and the pole group, one side of the connecting piece is electrically connected with the pole group, the other side of the connecting piece is electrically connected with the pole post, and at least part of the structure of one end of the pole post, which is close to the connecting piece, is positioned in the range of a circular ring formed by a plurality of vent holes on the connecting piece. Through setting up one side and the polar group electric connection and opposite side and polar post electric connection of connection piece, realize through connection piece with polar post and polar group electric connection, and then can realize connecting the battery at external circuit or be connected with other batteries through the polar post, it is corresponding with the air vent through setting up at least partial region of polar post, make the gas that passes through from the air vent can directly act on the polar post, thereby be convenient for fly the polar post top when the atmospheric pressure in the battery is too big, and break off when the atmospheric pressure in the battery around the explosion-proof fracture position of polar post structure on the casing is too big, can guarantee to be whole bullet open by the region that explosion-proof fracture position encircleed, guarantee that the polar post is whole to break away from the battery promptly, thereby can increase the area of exhausting, can guarantee battery and external circuit disconnection again, reach the problem that prevents the battery explosion that thermal runaway from spreading and lead to appear, improve the security performance.

In an alternative embodiment, the battery further comprises: the support piece is arranged between the shell and the connecting sheet, one side of the support piece is abutted against the connecting sheet, the other side of the support piece is abutted against the shell, a plurality of exhaust holes are formed in the support piece, and the exhaust holes correspond to the explosion-proof fracture phases; and/or a protruding part protruding out of the upper surface of the shell is formed on the shell around the pole, and the explosion-proof fracture position is arranged on the protruding part. The support piece plays a role in supporting the upper part and the lower part, the upper end of the support piece is contacted with the inner surface of the shell through the upper support surface, and the lower end of the support piece is contacted with the pole group, so that the pole group and the shell have higher integrity, and the upper end face of the pole group and the upper end face of the shell can be ensured to be parallel; the supporting piece is an insulating piece, so that the connecting piece and the shell can be supported, and insulation between the connecting piece and the shell is ensured; the support piece is provided with the vent hole corresponding to the explosion-proof fracture position, so that when the battery is in thermal runaway and other problems, the internal pressure of the battery can be quickly transmitted to the position corresponding to the explosion-proof fracture position through the vent hole, and the explosion-proof valve is quickly opened to release pressure, so that the safety of the battery is improved; the upper surface of bellying protrusion casing provides spacingly for the utmost point post, guarantees the stability of assembly to, explosion-proof fracture position and the upper surface of casing are not on same surface, if be provided with the notes liquid hole on the upper surface of casing, can guarantee explosion-proof fracture position and annotate the liquid hole and separate, pollute explosion-proof fracture position and lead to breaking down the weeping when avoiding annotating the liquid, guarantee that explosion-proof valve can in time open, thereby guarantee the security of battery.

In an alternative embodiment, the total area of the plurality of exhaust holes is S3, the explosion-proof breaking position is an explosion-proof notch, the explosion-proof notch is annular and the annular area is S4, wherein S3 is greater than 5×s4. The explosion-proof notch can be impacted by a sufficient amount of gas from the vent hole, and a sufficient impact force is provided for the explosion-proof notch, so that the explosion-proof notch is broken, and the safety of the battery is improved.

In an alternative embodiment, the support comprises: the support piece body is provided with a yielding hole at a position corresponding to the pole, and the yielding hole penetrates through the connecting part and the pole; and/or the first support rib is formed by extending downwards from the edge of the support piece body, and the first support rib stretches into a gap between the side wall of the shell and the connecting sheet so as to position the connecting sheet and the pole group. The yielding hole formed in the support member body provides yielding space for the connecting part so as to realize connection of the connecting sheet and the pole, and the space utilization is reasonable; the pole group and the shell are provided with a certain gap, the first supporting rib extends into the space between the side wall of the shell and the connecting sheet and further extends into the space between the pole group and the shell, so that the positioning and fixing effects of the connecting sheet and the pole group are achieved, the axial central symmetry of the pole group and the shell can be ensured, and the overall stability of the battery is improved.

In an alternative embodiment, the support further comprises: at least one internal supporting rib, the internal supporting rib is formed by the downward extension of partial structures on the lower surface of the supporting piece body, and the internal supporting rib is abutted with the upper surface of the connecting sheet. The lower extreme of support piece passes through inside supporting rib and connection piece looks butt, and fixed effectual can prevent that the connection piece from following the upper and lower direction and moving in the battery, increases the stability of structure to the structural style of supporting rib can alleviate support piece's weight, thereby improves the holistic energy density of battery.

In an alternative embodiment, the internal bracing includes: the second supporting rib is arranged on the inner side of the first supporting rib, a first positioning groove is formed in the second supporting rib, and the first positioning groove is matched with the reinforcing rib on the connecting sheet body; and/or, a third supporting rib is arranged on the inner side of the second supporting rib and positioned on the outer side of the exhaust hole, a second positioning groove is formed in the third supporting rib, and the second positioning groove corresponds to the first positioning groove and is matched with the reinforcing rib; and/or fourth supporting ribs are arranged on the inner side of the third supporting ribs and are positioned on the inner side of the exhaust holes, and the fourth supporting ribs enclose the abdication holes. The plurality of supporting ribs are arranged in a concentric ring manner, so that the strength of the supporting piece can be further increased, the weight of the supporting piece is reduced, the second supporting rib, the third supporting rib and the fourth supporting rib are in zero-clearance contact with the connecting piece, the inner supporting rib presses the connecting piece body when the explosion-proof valve is opened, the connecting piece is broken at the position of the connecting rib, and the broken connecting part and other parts fly out of the yielding hole, so that the supporting piece can be sprung together with the pole, and the unobstructed exhaust channel of the battery is ensured; and, the first constant head tank on the second supporting rib and the second constant head tank on the third supporting rib all cooperate with the strengthening rib, constant head tank and strengthening rib joint realize the joint of support piece and connection piece, and the location is effectual and connect stably, effectively avoids rocking relatively between the structure to guarantee overall structure's stability.

In an alternative embodiment, the lower end surface of the first support rib is 0.5mm to 1.0mm longer than the lower end surface of the inner support rib, and/or the thickness of the support member is 1.8±0.03mm. The strength of the supporting piece can be guaranteed, the space can be saved, and the space utilization rate is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a connecting piece according to an embodiment of the present invention;

FIG. 2 is a top view of the connecting tab shown in FIG. 1;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;

fig. 4 is a schematic view of a battery according to an embodiment of the present invention;

FIG. 5 is a top view of the battery shown in FIG. 4;

FIG. 6 is a cross-sectional view taken in the direction B-B of FIG. 5;

FIG. 7 is an enlarged partial schematic view of FIG. 6A;

FIG. 8 is an enlarged partial schematic view of B in FIG. 6;

FIG. 9 is a schematic view of a housing according to an embodiment of the present invention;

FIG. 10 is a top view of the housing of FIG. 9;

FIG. 11 is a cross-sectional view taken along the direction C-C in FIG. 10;

FIG. 12 is an enlarged partial schematic view of C in FIG. 11;

FIG. 13 is a schematic view of a support member according to an embodiment of the present invention;

FIG. 14 is a schematic view of the support of FIG. 13 from another perspective;

FIG. 15 is a top view of the support shown in FIG. 13;

FIG. 16 is a cross-sectional view taken along the direction D-D in FIG. 15;

fig. 17 is a schematic structural view of a negative electrode cover plate according to an embodiment of the present invention;

fig. 18 is a cross-sectional view of the negative electrode cap plate shown in fig. 17.

Reference numerals illustrate:

1. a housing; 101. explosion-proof fracture sites; 102. a boss; 103. a mounting hole; 2. a pole group; 3. a connecting sheet; 301. a connecting piece body; 302. a connection part; 303. a vent hole; 304. a connecting rib; 305. reinforcing ribs; 4. a support; 401. an exhaust hole; 402. a support body; 403. a relief hole; 404. a first support rib; 405. second support ribs; 4051. a first positioning groove; 406. a third support rib; 4061. a second positioning groove; 407. fourth supporting ribs; 5. a pole; 6. a negative electrode cover plate; 601. a liquid injection hole; 602. a pole group welding area; 603. a recessed region; 604. a liquid injection area; 605. a welding part; 7. sealing the cover plate; 8. an insulating seal.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Embodiments of the present invention are described below with reference to fig. 1 to 18.

According to an embodiment of the present invention, in one aspect, there is provided a connecting piece, mainly including: a connecting piece body 301, a connecting part 302 and a plurality of vent holes 303.

Specifically, one side of the connecting piece body 301 is adapted to be electrically connected to the pole group 2; the connecting part 302 is arranged on one side of the connecting sheet body 301 far away from the pole group 2, the connecting part 302 protrudes out of the surface of the connecting sheet body 301, and the connecting part 302 is electrically connected with the pole 5; the plurality of vent holes 303 are arranged on the connecting sheet body 301 at intervals around the connecting portion 302, the circular ring surrounded by the plurality of vent holes 303 corresponds to the pole 5, the connecting sheet body 301 between two adjacent vent holes 303 forms a connecting rib 304, and the connecting rib 304 is suitable for being broken when the air pressure in the battery reaches a preset value so as to disconnect the pole 5 from the pole group.

In this embodiment, through setting up a plurality of spaced air vents 303 on the connection piece body 301, and a plurality of air vents 303 enclose into the ring, form the joint rib 304 between every adjacent two air vents 303, the intensity of joint rib 304 is less than the intensity of connection piece body 301, when the atmospheric pressure in the battery reaches a definite value, the weak joint rib 304 breaks at first, then the connecting portion 302 in the middle of the ring that a plurality of air vents 303 enclose drops from connection piece body 301, increase the ventilation area of connection piece 3, avoid connection piece 3 to cause the hindrance to the gas flow, and because the ring that a plurality of air vents 303 enclose is corresponding with utmost point post 5, then under the effect of the gas pressure in the battery, connecting portion 302 and utmost point post 5 that is connected with connecting portion 302 can wholly spring out from the battery under the effect of gas pressure, thereby improve the unobstructed nature of exhaust, prevent that the battery from exploding, and after utmost point post 5 breaks away from the battery, can in time cut off the electrical connection of utmost point post 5 and utmost point group, thereby cut off the battery and external circuit's connection, thereby avoid causing the short circuit to damage to whole circuit, improve the security.

The preset value is a predetermined air pressure value for preventing explosion of the battery, specifically 1.8±0.3Mpa; the connecting sheet 3 is a part in the battery and is positioned between the pole group 2 and the shell 1, the pole posts 5 on the pole group 2 and the shell 1 are respectively positioned at the upper side and the lower side of the connecting sheet 3, and the connecting sheet 3 is made of metal so as to realize the electric connection between the pole posts 5 and the pole group 2; the circle surrounded by the plurality of vent holes 303 corresponds to the pole 5, namely, the circle is located below the pole 5, the gas flowing upwards through the vent holes 303 directly acts on the pole 5, so that when the connecting rib 304 breaks, the gas sprayed out through the circle area directly acts on the pole 5, the acting force is large, so that the pole 5 can be conveniently ejected out of the battery, preferably, the circle surrounded by the plurality of vent holes 303 is suitable for covering the edge of the pole 5 near one end of the connecting piece body 301, wherein the upper direction is the direction of the arrow in fig. 6, and the lower direction is the direction of the arrow in fig. 6.

Preferably, the connecting portion 302 is welded to the pole 5, and the connecting piece body 301 is welded to the pole group 2 in a stable and reliable manner, and electrical connection can be ensured.

In one embodiment, the distance between two adjacent vent holes 303 ranges from 0.8mm to 1.2mm, that is, the size of each connecting rib 304 along the circumferential direction of the ring surrounded by the vent holes 303 ranges from 0.8mm to 1.2mm. The size of the connecting rib 304 formed between two adjacent vent holes 303 is smaller, the strength is smaller, the connecting rib 304 plays a role in connection in the normal state of the battery, and is disconnected when the air pressure in the battery is overlarge, if the distance between the two adjacent vent holes 303 is smaller than 0.8mm, the size of the connecting rib 304 along the circumferential direction of the circular ring is too small, so that the strength of a product is weaker, the stability of the structure of the battery product is not facilitated, and the processing is not easy; if the distance between two adjacent vent holes 303 of the connecting rib 304 is greater than 1.2mm, the connecting rib 304 is too large along the circumferential dimension of the circular ring, so that the connecting rib 304 is difficult to break, the opening effect of the explosion-proof valve is influenced, and the safety performance of the battery is influenced, therefore, when the distance between two adjacent vent holes 303 is within the range of 0.8mm-1.2mm, the strength of the connecting sheet 3 can be ensured, and the connecting rib 304 can be ensured to break in time when the air pressure in the battery reaches a preset value, thereby ensuring the safety of the battery. Preferably, the distance between two adjacent vent holes 303 is 1mm.

In one embodiment, the connecting portion 302 is cylindrical, the diameter of the cylindrical is D1, and the diameter of a circle surrounded by the plurality of ventilation holes 303 is D2, wherein 1.25.ltoreq.D2/D1.ltoreq.2.75. The diameter of the ring is a range of values, the minimum value in the range of values of the diameter of the ring is the minimum value of the diameter of the inner ring, and the maximum value in the range of values of the diameter of the ring is the maximum value of the diameter of the outer ring. The circular ring surrounded by the plurality of vent holes 303 and the connecting part 302 are positioned on the connecting sheet 3, if the ratio of the diameter D2 of the circular ring to the diameter of the connecting part 302 is smaller than 1.25, the diameter of the circular ring is too small, correspondingly, the area of the vent holes 303 is smaller, the ventilation area is smaller, and the exhaust effect is influenced; if the ratio of the diameter D2 of the ring to the diameter of the connecting portion 302 is greater than 2.75, the diameter of the ring is too large, that is, the area occupied by the ring on the connecting piece 3 is large, correspondingly, the area of the connecting piece body 301 is small, and the overcurrent capacity of the electrode group 2 and the connecting piece 3 is affected, so that the ratio of the diameter of the ring to the diameter of the connecting portion 302 is designed to be between 1.25 and 2.75, the exhaust effect can be ensured, the overcurrent capacity between the electrode group 2 and the connecting piece 3 is not affected, and the battery performance is ensured.

In one embodiment, the diameter of the ring enclosed by the plurality of ventilation holes 303 is 3.5mm-16mm. The connecting part 302 positioned in the middle of the circular ring is used for being electrically connected with the pole 5 so as to realize the electrical connection between the pole 5 and the connecting piece 3, if the diameter of the circular ring is smaller than 3.5mm, the diameter of the circular ring is too small, so that the connecting part 302 is too small, and the overcurrent capacity of the pole 5 and the connecting piece 3 is affected; the part of the connecting sheet 3, which is arranged outside the circular ring, is used for being electrically connected with the pole group 2, if the diameter of the circular ring is larger than 16mm, the diameter of the circular ring is overlarge, the area of the connecting sheet body 301 is too small, and the overcurrent capacity of the pole group 2 and the connecting sheet 3 is affected, therefore, the diameter of the circular ring is set to be 3.5mm-16mm, the overcurrent capacity between the connecting sheet 3 and the pole 5 as well as between the connecting sheet 3 and the pole group 2 can be balanced respectively, the overcurrent capacity between the connecting sheet 3 and the pole 5 can be ensured, the overcurrent capacity between the connecting sheet 3 and the pole group 2 can be ensured, and the performance of the battery can be improved to the maximum extent.

In one embodiment, the thickness of the connecting tab body 301 is 0.4mm, where thickness refers to the dimension along the "up and down" direction indicated by the arrow in fig. 3. The connecting piece 3 is located between the shell 1 and the pole group 2 of the battery, and is welded with the pole 5 and the pole group 2 respectively, so that the effect of electrically connecting the pole 5 and the pole group 2 is achieved, the supporting effect is achieved, the thickness of the connecting piece body 301 is set to be 0.4mm, the welding effect and the product strength can be guaranteed, and the overcurrent capacity of the product can be met.

In one embodiment, a plurality of reinforcing ribs 305 are arranged at intervals on the edge of the connecting sheet body 301, the reinforcing ribs 305 protrude out of the surface of the connecting sheet body 301, so that the strength of the connecting sheet 3 can be enhanced, and the connecting sheet can be used for being clamped with a structure above the connecting sheet 3, so that the connecting sheet 3 is prevented from rotating, and the limiting effect is good. Specifically, the reinforcing rib 305 protrudes upward from the upper surface of the connection piece body 301 in the direction of the arrow in fig. 3, and the protruding direction of the connection portion 302 is the same, and the protruding dimension of the reinforcing rib 305 is smaller than the protruding dimension of the connection portion 302, so that the dimension of the connection piece 3 in the direction of the arrow in fig. 3 except for the connection portion 302 is reduced, thereby compressing the height of the battery and increasing the energy density of the battery. Preferably, the number of the reinforcing ribs 305 is three, and the three reinforcing ribs 305 are arranged at the edge position of the connecting sheet body 301 in an equidistant surrounding manner.

According to an embodiment of the present invention, in another aspect, there is also provided a battery, including: the shell 1, the pole group 2, the pole 5 and the connecting piece 3.

Specifically, the pole group 2 is placed inside the housing 1; the pole 5 is arranged at one end of the shell 1, the pole 5 is in insulating connection with the shell 1, and an explosion-proof fracture site 101 is formed on the shell 1 around the pole 5; the connection piece 3 is arranged between the pole 5 and the pole group 2, one side of the connection piece 3 is electrically connected with the pole group 2, the other side of the connection piece 3 is electrically connected with the pole 5, and at least part of the structure of one end of the pole 5, which is close to the connection piece 3, is positioned in the range of a circular ring formed by a plurality of vent holes 303 on the connection piece 3.

In this embodiment, through setting up one side and the polar group 2 electric connection of connection piece 3 and opposite side and polar 5 electric connection, realize through connection piece 3 with polar 5 and polar group 2 electric connection, and then can realize connecting the battery at external circuit or other batteries through polar 5, through setting up at least partial region and the air vent 303 correspondence of polar 5, make the gas that passes through from air vent 303 can directly act on polar 5, thereby be convenient for when the atmospheric pressure in the battery is too big fly polar 5, and the explosion-proof fracture site 101 of encircling polar 5 structure on casing 1 breaks off when the atmospheric pressure in the battery is too big, can guarantee that the region that is encircleed by explosion-proof fracture site 101 can wholly pop out, guarantee that polar 5 is whole to break away from the battery promptly, thereby can increase the exhaust area, can guarantee battery and external circuit disconnection again, reach the problem that prevents the explosion of battery that the thermal runaway leads to appear, improve the security performance.

The explosion-proof breaking position 101 forms an explosion-proof valve, the strength of the explosion-proof breaking position 101 is smaller than that of other areas on the shell 1, when the air pressure in the battery reaches a preset value, the explosion-proof breaking position 101 breaks first, the explosion-proof valve is opened, the air in the battery is discharged, and the explosion of the battery caused by the overhigh air pressure in the battery is prevented; one side of the connecting piece 3 refers to the side in the direction of the arrow "lower" in fig. 6, and the other side of the connecting piece 3 refers to the side in the direction of the arrow "upper" in fig. 6.

Preferably, the pole 5 is mounted at the upper end of the housing 1, wherein the upper end refers to the end in the direction of the "upper" arrow in fig. 6.

Preferably, the explosion-proof fracture site 101 is a circle surrounding the pole 5, and the exhaust area is large and convenient for processing. It will be appreciated that the explosion proof break 101 may be in a variety of shapes such as an oval, racetrack, etc. as an alternative embodiment.

In one embodiment, the battery is a cylindrical battery, the post 5 is a positive post, the connecting piece 3 is a positive connecting piece, the connecting piece 3 is circular, the positive post is connected with the positive pole of the pole group 2 through the positive connecting piece, and at this time, the negative pole of the battery is located at one end of the shell 1 far away from the positive post and is connected with the negative pole of the pole group 2. It will be appreciated that, as an alternative embodiment, the battery is not limited to a cylindrical battery, but may be a square battery or the like, the shape of the connecting piece 3 is adapted to the shape of the battery case, the post 5 may include both a positive post and a negative post, the positive post and the negative post may be disposed on the same end face of the case 1 or on opposite two end faces, insulation between the positive post and the negative post is required to be ensured, the positive post is connected with the positive pole of the pole group 2, the negative post is connected with the negative pole of the pole group 2, and explosion-proof breaking sites 101 may be provided in the circumferential directions of the positive post and the negative post to increase the exhaust area.

In one embodiment, the battery further comprises: an insulating seal 8, the insulating seal 8 being provided between the pole 5 and the housing 1 to make the pole 5 and the housing 1 in insulating and sealing connection. The insulating sealing piece 8 can realize the insulating connection of the pole 5 and the shell 1, and can improve the tightness of the battery, and the insulating sealing piece 8 integrates sealing and insulation in one structural member, so that the sealing and insulating performances are improved, the battery cost is saved greatly, and the competitiveness of the product is improved. Specifically, the casing 1 is provided with a mounting hole 103, the pole 5 and the insulating sealing member 8 are clamped in the mounting hole 103, and the insulating sealing member 8 is wrapped around the pole 5, so that the pole 5 is in sealing connection with the casing 1.

In one embodiment, the battery further comprises: the support piece 4, the support piece 4 sets up between casing 1 and connection piece 3, and one side and the connection piece 3 butt of support piece 4 and the opposite side and casing 1 butt are provided with a plurality of exhaust holes 401 on the support piece 4, and a plurality of exhaust holes 401 correspond with explosion-proof fracture site 101. The support piece 4 plays a role in supporting the upper part and the lower part, the upper end of the support piece 4 is contacted with the inner surface of the shell 1 through the upper support surface, and the lower end of the support piece 4 is contacted with the pole group 2, so that the pole group 2 and the shell 1 have higher integrity, and the upper end face of the pole group 2 and the upper end face of the shell 1 can be ensured to be parallel; the supporting piece 4 is an insulating piece, which not only can play a role in supporting the connecting piece 3 and the shell 1, but also can ensure insulation between the connecting piece 3 and the shell 1; the vent hole 401 corresponding to the explosion-proof breaking position 101 is arranged on the supporting piece 4, so that when the problems of thermal runaway and the like of the battery are guaranteed, the internal pressure of the battery can be rapidly transmitted to the position corresponding to the explosion-proof breaking position 101 through the vent hole 401, and the explosion-proof valve is rapidly opened to release pressure, so that the safety of the battery is improved. The upper end refers to the end along the direction of the arrow in fig. 6 and 16, and the lower end refers to the end along the direction of the arrow in fig. 6 and 16. The shape of the support member 4 is adapted to the cross-sectional shape of the case 1, specifically, when the battery is a cylindrical battery, the cross-section of the case 1 is circular, and the support member 4 is correspondingly circular.

In one embodiment, the total area of the plurality of vent holes 401 is S3, the explosion-proof breaking point 101 is an explosion-proof notch, the explosion-proof notch is annular and the annular area is S4, wherein S3 is greater than 5×s4. The explosion-proof notch is a circle of narrower ring shape surrounding the pole 5 on the surface of the shell 1, and the area occupied by the ring shape is the area of the explosion-proof notch. The total area of the plurality of vent holes 401 is the total area of the support piece 4 through the gas, the plurality of vent holes 401 are right opposite to the explosion-proof notch, if the total area of the vent holes 401 is too small, the explosion-proof notch is difficult to be broken in time, the total area of the plurality of vent holes 401 is larger than 5 times of the area of the explosion-proof notch, the explosion-proof notch can be impacted through the sufficient amount of gas from the vent holes 401, and the sufficient impact force is provided for the explosion-proof notch, so that the explosion-proof notch is broken, and the safety of the battery is improved. Wherein, the explosion-proof nick can be obtained through die cutting; it will be appreciated that, as an alternative embodiment, the explosion-proof breaking point 101 may be a thinned region formed by stamping, which region may likewise be secured to a lesser strength than other regions on the housing 1.

In one embodiment, the housing 1 is provided with a protrusion 102 protruding from the upper surface of the housing 1 around the pole 5, and the explosion-proof breaking point 101 is provided on the protrusion 102. The bulge 102 protrudes out of the upper surface of the shell 1, and then the explosion-proof breaking position 101 and the upper surface of the shell 1 are not on the same surface, so that when a liquid injection hole is formed in the upper surface of the shell 1, the explosion-proof breaking position 101 and the liquid injection hole can be ensured to be separated, the explosion-proof breaking position is prevented from being polluted during liquid injection, the breakdown and the leakage are caused, and the explosion-proof valve is ensured to be opened in time, so that the safety of a battery is ensured. The upper surface refers to the surface along the direction of the arrow in fig. 6 and 11.

In one embodiment, the support 4 mainly comprises a support body 402. The support member body 402 is provided with a yielding hole 403 at a position corresponding to the pole 5, the yielding hole 403 penetrates through the connecting portion 302 and the pole 5, the yielding hole 403 formed in the support member body 402 provides a yielding space for the connecting portion 302, so that the connection of the connecting piece 3 and the pole 5 is realized, and the space utilization is reasonable.

In one embodiment, the support 4 further comprises: the first supporting rib 404, the first supporting rib 404 is formed by extending downwards from the edge of the supporting member body 402, and the first supporting rib 404 extends into the gap between the side wall of the shell 1 and the connecting piece 3 to position the connecting piece 3 and the pole group 2. A certain gap is formed between the pole group 2 and the shell 1, the first supporting rib 404 extends into the space between the side wall of the shell 1 and the connecting sheet 3 and further extends into the space between the pole group 2 and the shell 1, so that the positioning and fixing effects on the connecting sheet 3 and the pole group 2 are achieved, the axial central symmetry of the pole group 2 and the shell 1 can be ensured, and the overall stability of the battery is improved.

In one embodiment, the support 4 further comprises: at least one internal rib extending downwardly from a portion of the structure on the lower surface of the support body 402, the internal rib abutting against the upper surface of the connecting tab 3. It should be noted that, the first supporting rib 404 is formed by extending the edge of the supporting member body 402 downwards, so as to form a ring or other closed shapes consistent with the edge of the supporting member body 402, the inner supporting rib is located at the inner side of the first supporting rib 404 along the radial direction, the lower end of the supporting member 4 is abutted against the connecting sheet 3 through the inner supporting rib, the fixing effect is good, the connecting sheet 3 can be prevented from moving in the up-down direction in the battery, the stability of the structure is increased, and the structural form of the supporting rib can lighten the weight of the supporting member 4, so that the integral energy density of the battery is improved. Wherein, the lower refers to the direction of the arrow in fig. 6, and the upper refers to the direction of the arrow in fig. 6.

In one embodiment, the lower end surface of the first brace 404 is 0.5mm-1.0mm longer than the lower end surface of the inner brace. The lower terminal surface of inside supporting rib and the up end looks butt of connection piece 3, then the lower terminal surface of first supporting rib 404 is lower 0.5mm-1.0mm than the up end of connection piece 3 to guarantee that first supporting rib 404 can stretch into in the clearance between polar group 2 and the casing 1, if the difference between the lower terminal surface of first supporting rib 404 and the lower terminal surface of inside supporting rib is less than 0.5mm, the too little difficult processing of size can cause manufacturing cost's increase, if the difference between the lower terminal surface of first supporting rib 404 and the lower terminal surface of inside supporting rib is greater than 1.0mm, the size is too big can make weight increase, the precision reduces, still can influence space utilization. Preferably, the lower end face of the first supporting rib 404 is 0.8mm longer than the lower end face of the inner supporting rib, so that the machining difficulty is not affected, excessive weight can be avoided, and the machining precision is ensured.

In one embodiment, the thickness of the support 4 is 1.8±0.03mm, wherein the thickness of the support 4 refers to the distance between the upper end surface of the support 4 and the lower end surface of the first support rib 404. The thickness of the supporting member 4 needs to be as thin as possible to reduce the distance between the inner surface of the case 1 and the upper surface of the connecting sheet 3, improve the space utilization, and improve the overall energy density of the battery, but at the same time, the supporting strength of the supporting member 4 itself needs to be ensured. Through setting up the thickness of support piece 4 to be 1.8 + -0.03 mm, can guarantee the intensity of support piece 4 itself, can save space again, improve space utilization.

In one embodiment, the internal bracing includes: the second supporting rib 405, the second supporting rib 405 is disposed on the inner side of the first supporting rib 404, the second supporting rib 405 is configured with a first positioning groove 4051, and the first positioning groove 4051 is matched with the reinforcing rib 305 on the connecting piece body 301. The internal bracing further comprises: and a third supporting rib 406, wherein the third supporting rib 406 is arranged at the inner side of the second supporting rib 405 and is positioned at the outer side of the exhaust hole 401, the third supporting rib 406 is provided with a second positioning groove 4061, and the second positioning groove 4061 corresponds to the first positioning groove 4051 and is matched with the reinforcing rib 305. The internal bracing further comprises: fourth brace 407, fourth brace 407 is located in third brace 406 and is located in exhaust hole 401, fourth brace 407 encloses into hole 403. Wherein, the inner side refers to the inner side in the radial direction of the cell cross section. The plurality of supporting ribs are arranged in a concentric ring manner, so that the strength of the supporting piece 4 can be further increased, and meanwhile, the weight of the supporting piece 4 is reduced, wherein the second supporting rib 405, the third supporting rib 406 and the fourth supporting rib 407 are in zero-clearance contact with the connecting piece 3, the inner supporting rib presses the connecting piece body 301 when the explosion-proof valve is opened, the connecting piece 3 is broken at the position of the connecting rib 304, and the broken connecting portion 302 and other parts fly out of the abdicating hole 403, so that the connecting piece can be sprung out together with the pole 5, and the exhaust channel of the battery is ensured to be unobstructed; and, first constant head tank 4051 on the second supporting rib 405 and second constant head tank 4061 on the third supporting rib 406 all cooperate with strengthening rib 305, and the constant head tank realizes the joint of support piece 4 and connection piece 3 with strengthening rib 305 joint, and the location is effectual and connect stably, effectively avoids rocking relatively between the structure to guarantee overall structure's stability.

In one embodiment, the battery further comprises: the liquid filling hole 601, the liquid filling hole 601 sets up the one end that keeps away from explosion-proof fracture position 101 on the battery. The liquid injection hole 601 and the explosion-proof breaking position 101 are arranged at two opposite ends of the shell 1 separately, so that the pollution to the explosion-proof breaking position 101 caused by splashing of liquid to the explosion-proof breaking position 101 during liquid injection can be avoided, the breakdown and liquid leakage caused by pollution to the explosion-proof breaking position 101 can be avoided, and the explosion-proof valve can be opened in time. It will be appreciated that, as an alternative embodiment, the injection hole 601 and the explosion-proof breaking point 101 may be disposed at the same end of the housing 1, where the explosion-proof breaking point 101 needs to be protected, for example, the explosion-proof breaking point 101 is disposed on the protrusion 102 protruding from the upper surface of the housing 1, so as to avoid contamination of the explosion-proof breaking point 101.

In one embodiment, the pole 5 is a positive pole, the positive pole is electrically connected with the positive pole of the pole group 2 through the connecting sheet 3, one end, far away from the positive pole, of the casing 1 is an open end, and the battery further comprises: the negative electrode cover plate 6, the negative electrode cover plate 6 sets up the one end of keeping away from the positive pole at casing 1 to seal casing 1, negative electrode cover plate 6 and the negative electrode electric connection of utmost point group 2, annotate the liquid hole 601 setting on negative electrode cover plate 6. When the electrode post 5 is an anode post, the connecting sheet 3 is an anode connecting sheet; the negative electrode cover plate 6 is electrically connected with the negative electrode of the electrode group 2, and the negative electrode cover plate 6 is used as a negative electrode connecting end of the battery to be connected with an external circuit or other batteries. Through setting up annotating liquid hole 601 on keeping away from negative pole apron 6 of positive pole one end, guaranteed annotating liquid hole 601 and positive pole and separated, annotate liquid hole 601 promptly and encircle explosion-proof fracture position 101 that post 5 set up and keep away from each other, electrolyte when effectively guaranteeing annotating the liquid to the battery through annotating liquid hole 601 can not splash explosion-proof fracture position 101 department, guarantees explosion-proof fracture position 101 not receive the pollution to guarantee the security of battery.

In one embodiment, the negative cover plate 6 includes a pole group welding region 602 and a recessed region 603, the pole group welding region 602 being disposed around the recessed region 603, the recessed region 603 being recessed downward relative to the pole group welding region 602, the pole group welding region 602 being welded to the pole group 2. The electrode group welding area 602 is welded with the electrode group 2, so that the electric connection between the negative electrode cover plate 6 and the electrode group 2 is realized, and compared with the traditional method that the negative electrode of the electrode group 2 is connected with a negative electrode post through a negative electrode plate connecting piece, the use of the negative electrode connecting piece is omitted, the number of structural parts is reduced, the welding process is reduced, and the product cost is saved; through setting up utmost point group welded zone 602 for recessed area 603 upwards convex plane, the setting up of recessed area 603 has increased the bulk strength of negative pole apron 6 to be favorable to guaranteeing the planarization of utmost point group welded zone 602, guarantee the laminating degree of utmost point group welded zone 602 and utmost point group 2, thereby guarantee the welding effect. The lower direction is in the direction of the arrow "lower" in fig. 6; the upper direction is the direction of the arrow "upper" in fig. 6 and 18.

Preferably, the electrode group welding area 602 is connected with the electrode group 2 by laser penetration welding, and after the negative electrode cover plate 6 is buckled on the shell 1, the welding connection between the negative electrode cover plate 6 and the electrode group 2 can be realized by directly operating one side of the negative electrode cover plate 6 facing the outside of the battery, so that the technology is mature, the operation is convenient, the connection after welding is stable, the assembly process can be optimized, the manufacturability of the product is improved, and the yield of the product is improved.

In one embodiment, the anode cover plate 6 further includes: the liquid injection area 604, the liquid injection area 604 is raised upwards relative to the concave area 603 and is flush with the upper surface of the pole group welding area 602, the concave area 603 is arranged around the liquid injection area 604, and the liquid injection area 604 is provided with liquid injection holes 601. Wherein, the upper part is the direction of the arrow in fig. 6 and 18; the recess 603 surrounding the liquid filling area 604 means that the recess 603 is located outside the liquid filling area 604 in the radial direction. Through setting up the bellied notes liquid district 604 that makes progress for recessed area 603, for the position that sets up that annotates liquid hole 601 provided, and be convenient for annotate liquid, can prevent to annotate the in-process electrolyte and flow to the negative pole on the apron 6 annotate the surface beyond the liquid district 604 to prevent the corruption of electrolyte to the negative pole apron 6 that flows.

In one embodiment, the anode cover plate 6 further includes: the welding portion 605, the welding portion 605 is formed by extending the edge of the pole group welding area 602 downwards, the welding portion 605 is abutted against the inner wall of the casing 1 and is welded with the casing 1, wherein the lower direction is the direction of the arrow in fig. 6 and 18. The shape looks adaptation of welding portion 605 and casing 1 has realized the connection of negative pole apron 6 and casing 1 through with welding portion 605 and casing 1, convenient operation, and the connection is stable, and welding portion 605 has certain size along the "upper and lower" direction that the arrow indicates in fig. 6, can guarantee the stability of negative pole apron 6 and casing 1 assembly.

In one embodiment, the battery further comprises: and a sealing cover plate 7, wherein the sealing cover plate 7 is detachably arranged at the liquid injection hole 601 on the cathode cover plate 6. When the battery needs to be filled with liquid, the sealing cover plate 7 is opened to realize filling of liquid from the liquid filling hole 601 into the battery; when the battery is filled, the sealing cover plate 7 is installed to seal the filling hole 601, so that electrolyte in the battery is prevented from flowing out, and the battery is good in sealing performance and convenient to use.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims (10)

1. A connecting tab, comprising:

one side of the connecting sheet body is electrically connected with the pole group;

the connecting part is arranged on one side, far away from the pole group, of the connecting piece body, protrudes out of the surface of the connecting piece body, and is suitable for being electrically connected with the pole column;

the connecting piece body is provided with a plurality of vent holes, the vent holes are arranged at intervals, the circular ring formed by surrounding the vent holes corresponds to the pole, the connecting piece body between two adjacent vent holes forms a connecting rib, and the connecting rib is suitable for being broken when the air pressure in the battery reaches a preset value so as to enable the pole to be disconnected with the pole group.

2. The connecting piece according to claim 1, wherein the distance between centers of two adjacent ventilation holes is in the range of 0.8mm to 1.2mm;

and/or the connecting part is cylindrical, the diameter of the cylindrical shape is D1, the diameter of a circular ring surrounded by a plurality of vent holes is D2, wherein D2/D1 is more than or equal to 1.25 and less than or equal to 2.75;

and/or the diameter of the circular ring surrounded by the plurality of vent holes is 3.5mm-16mm.

3. A connecting piece according to claim 1 or 2, characterized in that the connecting piece body has a thickness of 0.4mm.

4. A battery, comprising:

a housing;

a pole set disposed within the housing;

the pole is arranged at one end of the shell, the pole is connected with the shell in an insulating way, and an explosion-proof breaking position is formed on the shell around the pole;

a connection piece as claimed in any one of claims 1 to 3, which is arranged between the pole and the pole group, one side of the connection piece being electrically connected to the pole group and the other side being electrically connected to the pole, at least part of the structure of the pole near one end of the connection piece being located within the circle formed by the plurality of ventilation holes on the connection piece.

5. The battery of claim 4, wherein the battery further comprises: the support piece is arranged between the shell and the connecting sheet, one side of the support piece is abutted against the connecting sheet, the other side of the support piece is abutted against the shell, a plurality of exhaust holes are formed in the support piece, and the exhaust holes correspond to the explosion-proof fracture phases;

and/or a protruding part protruding out of the upper surface of the shell is formed on the shell around the pole, and the explosion-proof fracture position is arranged on the protruding part.

6. The battery of claim 5, wherein the total area of the plurality of vent holes is S3, the explosion-proof breaking point is an explosion-proof notch, the explosion-proof notch is annular and the annular area is S4, and S3 is greater than 5 x S4.

7. The battery of claim 5, wherein the support comprises:

the support piece body is provided with a yielding hole at a position corresponding to the pole, and the yielding hole penetrates through the connecting part and the pole;

and/or the first support rib is formed by extending downwards from the edge of the support piece body, and the first support rib stretches into a gap between the side wall of the shell and the connecting sheet so as to position the connecting sheet and the pole group.

8. The battery of claim 7, wherein the support further comprises: at least one internal supporting rib, the internal supporting rib is formed by the downward extension of partial structures on the lower surface of the supporting piece body, and the internal supporting rib is abutted with the upper surface of the connecting sheet.

9. The battery of claim 8, wherein the internal support rib comprises:

the second supporting rib is arranged on the inner side of the first supporting rib, a first positioning groove is formed in the second supporting rib, and the first positioning groove is matched with the reinforcing rib on the connecting sheet body;

and/or, a third supporting rib is arranged on the inner side of the second supporting rib and positioned on the outer side of the exhaust hole, a second positioning groove is formed in the third supporting rib, and the second positioning groove corresponds to the first positioning groove and is matched with the reinforcing rib;

and/or fourth supporting ribs are arranged on the inner side of the third supporting ribs and are positioned on the inner side of the exhaust holes, and the fourth supporting ribs enclose the abdication holes.

10. The battery of claim 8, wherein the lower end face of the first support rib is 0.5mm-1.0mm longer than the lower end face of the inner support rib;

and/or the thickness of the support is 1.8+/-0.03 mm.