CN114447482A - Secondary top cover for square battery and square battery with secondary top cover - Google Patents

Abstract

The invention discloses a secondary top cover for a square battery and the square battery with the same, wherein the secondary top cover comprises: top cap and negative pole connection piece be equipped with the negative pole post on the top cap, the negative pole connection piece includes: the connecting piece is suitable for being connected with the lower end of the negative pole column, the first main body portion is arranged below the connecting piece, the first main body portion comprises a plurality of first polar claws which are connected with negative pole lugs at one end of the battery core, and the distance between the first polar claws is equal to the distance between the negative pole lugs. After the secondary top cover is matched on the battery cell, the stability and the safety of the battery cell can be improved, so that the overall structure of the square battery is more stable.

Description

Secondary top cover for square battery and square battery with secondary top cover

Technical Field

The invention relates to the technical field of batteries, in particular to a secondary top cover for a square battery and the square battery with the secondary top cover.

Background

Among the correlation technique, to the electric core of current both sides play utmost point ear, the electric core is installed and is taken place to rock easily behind the casing, leads to the connecting line between utmost point ear and the electrode post to easily take place fatigue fracture or pine take off to make electric core also easily because of breaking or damaging with the casing collision production, the fault rate is high, and stability is relatively poor.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a secondary cap for a prismatic battery and a prismatic battery having the same, wherein the secondary cap is fitted on a battery cell to improve the stability and safety of the battery cell, so that the overall structure of the prismatic battery is more stable.

The invention also provides a square battery with the secondary top cover.

According to the second aspect embodiment of the present invention, the secondary cap comprises: top cap and negative pole connection piece be equipped with the negative pole post on the top cap, the negative pole connection piece includes: the connecting piece is suitable for being connected with the lower end of the negative pole column, the first main body portion is arranged below the connecting piece, the first main body portion comprises a plurality of first polar claws which are connected with negative pole lugs at one end of the battery core, and the distance between the first polar claws is equal to the distance between the negative pole lugs.

According to the secondary top cover provided by the embodiment of the invention, the plurality of first pole claws are connected with the negative pole lug at one end of the battery core, and the distance between every two adjacent first pole claws is equal to the distance between every two adjacent negative pole lugs, so that the negative pole connecting sheet can be conveniently connected with the negative pole lug, and the assembly efficiency is improved. In addition, the negative pole connection piece cooperation is at the side of battery, not only makes its casing can not take place to rock after square battery assembles to can prevent that electric core from squinting by a wide margin, and then make square battery's overall structure stable. Meanwhile, the negative connecting sheet and the positive connecting sheet can be separated, so that the positive connecting sheet and the negative connecting sheet can not be connected, and the safety and the service life of the square battery can be improved.

In addition, the secondary top cover according to the invention can also have the following additional technical characteristics:

in some embodiments of the invention, the first pole claws all extend in the vertical direction and have the same length.

In some embodiments, the first pole finger extends a length less than the cell height.

In some embodiments of the present invention, the first plurality of claws are spaced apart in a first direction, and a distance between the first claws at both ends of the first plurality of claws is smaller than a width of the top cover.

In other embodiments of the present invention, the negative electrode tab further comprises: the second main body part is arranged on the first main body part and located between the two adjacent first polar claws, and the second main body part comprises a second polar claw which extends in the vertical direction and is connected with the negative electrode lug at one end of the battery core.

Optionally, the second claw is provided with a plurality of second claws which are arranged at intervals along a second direction, and the distance between each second claw and the corresponding first claw is smaller than the distance between two adjacent second claws.

Optionally, an end of the first pole claw far away from the top cover is at the same level as an end of the second pole claw far away from the top cover.

In some embodiments of the invention, the negative connector tab further comprises: one end of the bending part is connected with the connecting sheet, and the other end of the bending part extends towards the direction perpendicular to the connecting sheet and is connected with the first main body part.

In some embodiments of the invention, the secondary overcap further comprises: the connecting piece wraps the outer sides of the first main body part and the second main body part so as to enable the first main body part and the second main body part to be fixedly connected.

The present invention also provides a prismatic battery having the secondary top cap of the above embodiment.

A prismatic battery according to an embodiment of the second aspect of the invention includes: the battery cell is arranged in the installation space, and after the secondary top cover is matched with the opening, the negative connecting sheet of the secondary top cover is positioned in the installation space.

Therefore, according to the square battery provided by the embodiment of the invention, after the second top cover is matched with the opening, the negative connecting piece of the secondary top cover is positioned in the installation space, so that the negative connecting piece can be connected with the negative electrode lug of the battery cell more safely, and the safety of the square battery is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a prismatic battery having a secondary top cap according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a structure having a secondary cap in accordance with the practice of the present invention;

FIG. 3 is an exploded view of a secondary cap in accordance with the practice of the present invention;

FIG. 4 is a schematic diagram of an angled configuration of a negative connector tab with a secondary cap in accordance with the present invention;

fig. 5 is a schematic view of another angled configuration of a negative connector tab with a secondary cap, according to an embodiment of the present invention.

Reference numerals:

a top cover; a top plate 11;

a backing plate 12; a mounting groove 121;

a negative electrode connecting sheet 2; a connecting piece 21;

a first main body portion 22; a first pole claw 221;

a second body portion 23; a second claw 231;

a bent portion 24;

a negative pole 3;

a connecting piece 4;

a square battery 1000; a housing 200.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

To facilitate understanding of the secondary top cap 100 and the prismatic battery 1000 having the same according to the embodiment of the present invention, the prismatic battery 1000 includes a case 200, a cell may be disposed in the case 200, and the cell may be plural, and the secondary top cap 1 may be disposed on the case 200 to seal the case 200. It should be noted that the battery cell used in the present invention may be a plurality of battery cells, and the positive tab and the negative tab of each battery cell are respectively located at the left end and the right end, so that in the use process of the battery 1000, short circuit is not easy to occur between the tabs, the current distribution is relatively uniform, the temperatures of the tabs at the two ends are substantially consistent, and compared with the tabs on the same side of the battery cell from which the positive tab and the negative tab are located at the same side, short circuit is easy to occur, the current distribution is relatively concentrated in the use process, and the temperature of the tab side is relatively high.

In addition, the positive pole lug of each battery cell is connected with the positive pole connecting sheet, and the negative pole lug is connected with the negative pole connecting sheet 2, so that the battery 1000 is more convenient in the charging and discharging processes. After the positive electrode lug and the negative electrode lug of the battery cell are respectively arranged at two ends of the battery cell, the positive connecting sheet 21 and the negative connecting sheet 21 which are connected with the positive electrode lug and the negative electrode lug are respectively arranged at two ends of the battery cell, so that the positive connecting sheet and the negative connecting sheet 2 can not interfere with each other during working, and the safety of the battery cell is improved.

In addition, it can be understood that, when the number of the battery cells is more than two, when the battery cells are configured, the positive electrode tabs of all the battery cells need to be located on the same side, and the negative electrode tabs need to be located on the other side of the battery cells, so that the positive and negative electrode connecting pieces can be conveniently connected with the positive and negative electrode tabs respectively.

It should be noted that, the secondary top cap 1 of the present application includes not only the negative electrode connecting piece 2, but also the positive electrode connecting piece, and as for the structure, the positive electrode connecting piece is similar to the negative electrode connecting piece 2, so the structure of the positive electrode connecting piece is not described herein again, and a person skilled in the art will know the structure and installation of the positive electrode connecting piece corresponding to the negative electrode connecting piece 2 after seeing the negative electrode connecting piece 2 of the present application.

A secondary top cap 100 for a prismatic battery 1000 according to an embodiment of the present invention will be described with reference to fig. 1 to 5.

As shown in fig. 1 to 5, a secondary top cap 100 for a prismatic battery 1000 according to an embodiment of the present invention includes: top cap 1 and negative pole connection piece 2.

Specifically, a negative pole post 3 is provided on the top cover 1, and the negative pole connecting piece 2 includes: connecting piece 21 and first main part 22, connecting piece 21 are suitable for and link to each other with the lower extreme of negative pole post 3, and the below of connecting piece 21 is located to first main part 22, and first main part 22 includes a plurality of first utmost point claws 221, and a plurality of first utmost point claws 221 all link to each other with the negative pole ear of electric core one end, and, the distance between two adjacent first utmost point claws 221 equals rather than the distance between two continuous negative pole ears.

That is, the negative electrode connecting piece 2 is fitted under the top cap 1 and allows the lower end of the negative electrode tab 3 to be connected to the connecting piece 21, so that current can flow better from the battery cell to the negative electrode tab 3 through the connecting piece 21 in order and then flow out, so that the battery 1000 can be used better.

For example, as shown in fig. 4 or fig. 5, the first pole claw 221 is connected to the negative pole tab at one end of the battery cell, so that the first main body portion 22 of the present application can be connected to a plurality of battery cells, and thus a plurality of battery cells can be assembled in the square battery 1000, and the power storage capacity of the square battery 1000 is further enhanced. Further, a certain distance can be spaced between a plurality of battery cells, so that after the negative electrode connecting piece 2 is connected with the negative electrode tab, interference between two adjacent first pole claws 221 is avoided, short circuit of the battery cells in the using process is avoided, and the safety of the battery cells is also improved.

Meanwhile, the first pole claws 221 may be spaced apart by a certain distance, and the size of the spaced distance may be determined according to the distance between two adjacent negative pole ears connected thereto, which is not limited herein. Further, by setting the distance between two adjacent first pole claws 221 to be equal to the distance between two negative electrode tabs connected thereto, for example: first polar claw an links to each other with electric core negative pole ear an, and first polar claw b links to each other with electric core negative pole ear b, and the distance between first polar claw a is first and first polar claw b equals with the distance between negative pole ear an and the negative pole ear b, from this, can make negative pole connection piece 2 link to each other with the negative pole ear more conveniently to improve assembly efficiency. The plurality herein means two or more, and is not limited.

It can be understood that, since the intervals between the cell negative electrode tabs may be the same or different, the intervals between the first pole claws 221 may be the same or different.

For example, when the negative electrode tabs of the plurality of cells are all located at the same position of the cells, and the cell placement postures are the same, so that the distances between two adjacent negative electrode tabs after the plurality of cells are placed together are the same, and thus, the distances between two adjacent first pole claws 221 of the plurality of first pole claws 221 may be set to be the same.

The following steps are repeated: the positions of the negative electrode lugs of the plurality of battery cells are different, and the postures of the battery cells are different, so that after the plurality of battery cells are placed, the distance between the negative electrode lugs is different, and therefore, the distance between two adjacent first pole claws 221 in the plurality of first pole claws 221 is also different.

Therefore, the first pole claw 221 of the negative pole connecting piece 2 can be set as a standard part, the standard part can be divided into two adjacent first pole claws 221 with the same distance, and the two adjacent first pole claws 221 with different distances, so that the negative pole connecting piece 2 can be conveniently installed and matched.

According to the secondary top cover 100 of the embodiment of the invention, the plurality of first pole claws 221 are connected with the negative pole lug at one end of the battery cell, and the distance between two adjacent first pole claws 221 is equal to the distance between two connected negative pole lugs, so that the negative pole connecting sheet 2 can be conveniently connected with the negative pole lug, and the assembly efficiency is improved. In addition, the negative electrode connecting sheet 2 is matched with the side of the battery 1000, so that the square battery 1000 cannot shake in the shell 200 after being assembled, the electric core can be prevented from being greatly deviated, and the whole structure of the square battery 1000 is stable. Meanwhile, the negative connecting piece 2 and the positive connecting piece can be separated, so that the positive connecting piece and the negative connecting piece 2 cannot be connected, and the safety and the service life of the square battery 1000 can be improved.

In some embodiments of the present invention, the plurality of first tabs 221 all extend along the vertical direction and have the same length, that is, the first tabs 221 may extend along the up-down direction, so that the plurality of first tabs 221 may be fitted before the negative electrode tab, and then the first tabs 221 are welded on the negative electrode tab, and the first tabs 221 extending along the vertical direction may be conveniently connected with the cell negative electrode tab.

Further, the extending lengths of the first pole claws 221 are the same, so that the first pole claws 221 can be conveniently matched with the negative electrode tab, inconvenience in matching due to different lengths of the first pole claws 221 is avoided, or welding process is complicated due to difference of the lengths of the first pole claws 221, and therefore after the first pole claws 221 with the same length are matched, assembly and welding efficiency can be improved.

In one embodiment, the length of the first pole claw 221 extending is less than the height of the battery cell, that is, the length of the first pole claw 221 extending in the up-down direction is less than the height of the battery cell in the up-down direction, so that after the first pole claw 221 is connected to the negative electrode tab, one end of the first pole claw 221 away from the top cover 1 does not contact with the casing 200 of the prismatic battery 1000, thereby preventing the current of the battery cell from flowing to the casing 200, and improving the safety. In addition, one end of the first pole claw 221, which is far away from the top cover 1 (can be understood as the lowest end of the first pole claw 221), is matched with the lower part of the negative electrode tab, which is far away from the top cover 1, so that no redundant part of the first pole claw 221 exists, and the first pole claw 221 is prevented from puncturing the battery cell when the battery cell shakes.

In some embodiments of the present invention, the plurality of first pole claws 221 are spaced apart in the first direction, and the distance between the first pole claws 221 at both ends of the plurality of first pole claws 221 is smaller than the width of the top cover 1, for example, as shown in fig. 2, the plurality of first pole claws 221 may be spaced apart in the front-rear direction, that is, the distance between two adjacent first pole claws 221 is a certain distance, and the first pole claws 221 may be fitted in the housing 200 after the top cover 1 is fitted on the housing 200 by limiting the distance between the two outermost first pole claws 221 to be smaller than the width of the top cover 1, so that the first pole claws 221 may be conveniently connected to the negative electrode tab.

In one embodiment, the negative electrode tab 2 further includes: the second body portion 23 is disposed on the first body portion 22 and located between two adjacent first pole claws 221, that is, the second body portion 23 is disposed between the plurality of first pole claws 221, and the front and the rear of the second body portion 23 have the first pole claws 221.

The second body portion 23 includes: and a second tab 231, the second tab 231 extending in a vertical direction and connected to the negative electrode tab at one end of the cell, whereby the second tab 231 and the first tab 221 are parallel to each other, so that the second tab 231 can be conveniently connected to the negative electrode tab.

When the distance between two adjacent first pole claws 221 is large and cannot be connected with the negative pole lug, the position of the second body part 23 on the first body part 22 can be determined according to actual needs, so that the second pole claw 231 can be connected with the negative pole lug, and therefore, the negative pole connecting piece 2 can be flexibly suitable for the two adjacent negative pole lugs with different distances by arranging the second body part 23 on the first body part 22.

Alternatively, the second claw 231 is provided in plurality, the plurality of second claws 231 are arranged at intervals along the second direction, and the distance between the second claw 231 and the first claw 221 is smaller than the distance between two adjacent second claws 231.

In one example, the second direction is parallel to the first direction, such that the direction in which the second tab 231 is arranged is parallel to the direction in which the first tab 221 is arranged, and specifically, the direction in which the second tab 231 is arranged is aligned with the direction in which the first tab 221 is arranged, i.e., the second tab 231 is aligned with the first tab 221, such that the second tab 231 can better fit with the first tab 221 to connect to the plurality of negative electrode tabs.

In one embodiment, the distances between all adjacent two second claws 231 are equal to facilitate manufacturing of the second claws 231, and after the second body portion 23 is fitted on the first body portion 22, the distances between all adjacent second claws 231 and the first claws 221 are equal to enable the second body portion 23 and the first body portion 22 to be conveniently fitted with cells in different postures.

Optionally, the end of the first pole claw 221 away from the top cover 1 and the end of the second pole claw 231 away from the top cover 1 (the end of the second pole claw 231) are at the same level, so that there is no excess portion of the first pole claw 221 and the second pole claw 231, and the first pole claw 221 and/or the second pole claw 231 are prevented from puncturing the battery cell when the battery cell shakes, so that there is no excess portion after the end of the second pole claw 231 is fitted with the negative electrode tab, and the safety of the battery cell can be improved.

In some embodiments of the invention, the negative connector tab 2 further comprises: bending portion 24, one end of bending portion 24 links to each other with connection piece 21, and the other end of bending portion 24 extends towards the direction that is perpendicular to connection piece 21 and links to each other with first main part 22, for example as shown in fig. 5, bending portion 24 is two parts, and wherein the first portion links to each other with connection piece 21, just the first portion is parallel with connection piece 21, bending portion 24 the second portion with the first portion is perpendicular, the second portion links to each other with first main part 22. By providing the bent portion 24 between the connecting piece 21 and the first body portion 22, it is possible to make the current flow from the connecting piece 21 to the first body portion 22 or the current flow from the first body portion 22 to the connecting piece 21.

In one example, the first body portion 22, the connecting piece 21, and the bent portion 24 are integrally molded, so that the first tab 221 can be conveniently connected to the negative electrode tab by the integrally molded structure, and the assembly efficiency of the square battery 1000 can be improved.

In some embodiments of the present invention, the secondary overcap 100 further includes: the connecting member 4, the connecting member 4 is wrapped on the outer side of the first main body part 22 and the second main body part 23 to fixedly connect the first main body part 22 and the second main body part 23, for example, as shown in fig. 2, the connecting member 4 can be wrapped on the connecting area of the first main body part 22 and the second main body part 23 to connect the first main body part 22 and the second main body part 23 more firmly. Of course, the connecting member 4 may wrap around the first body portion 22 to protect the first body portion 22. It is understood that the connecting element 4 may be encapsulated or have other configurations without limitation.

In some embodiments of the invention, the cap 1 comprises: roof 11 and backing plate 12, backing plate 12 top is located to roof 11, forms mounting groove 121 in the one end of backing plate 12, and mounting groove 121 forms the opening towards the direction of keeping away from roof 11, and negative pole connection piece 2 includes: the connecting piece 21 is suitable for being matched in the mounting groove 121, the first main body portion 22 is arranged below the connecting piece 21 and extends in the vertical direction, and the first main body portion 22 is suitable for being connected with a negative pole lug at the other end of the battery cell.

That is to say, negative pole connection piece 2 can cooperate in the below of top cap 1, specifically speaking, connection piece 21 of negative pole connection piece 2 can cooperate in mounting groove 121 for after top cap 1 cooperates with casing 200, connection piece 21 can not occupy the space in the casing 200, thereby make square battery 1000's compact structure, and then make square battery 1000 can more conveniently assemble to other structurally, and the installation space that other structures reserved for square battery 1000 can reduce.

Through locating first main part 22 at the lower extreme of connection piece 21, and first main part 22 extends along upper and lower direction for the upper end of first main part 22 can link to each other with connection piece 21, and the lower extreme of first main part 22 can link to each other with the negative pole ear of electricity core, thereby makes the electric current can be better follow the electricity core in proper order and pass through the negative pole ear to connection piece 21 then flow out, so that the battery can be used better.

Alternatively, the orthographic projection of the shim plate 12 is located inside the orthographic projection of the top plate 11, that is, the width of the shim plate 12 is smaller than that of the top plate 11, so that after the top cover 1 is fitted on the housing 200, the outer peripheral wall of the shim plate 12 can abut against the inner peripheral wall of the housing 200, and the bottom wall of the top plate 11 abuts against the upper end surface of the housing 200 to seal the opening of the housing 200.

According to the secondary top cover 100 of the embodiment of the invention, the connecting sheet 21 is matched in the mounting groove 121, so that after the top cover 1 is matched with the shell 200, the connecting sheet 21 does not occupy the space in the shell 200, the structure of the square battery 1000 is compact, and the square battery 1000 can be conveniently assembled to other structures.

Alternatively, the orthographic projection of the bent portion 24 is located inside the orthographic projection of the mounting groove 121, whereby, when the top cover 1 is fitted on the housing 200, the bent portion 24 can be fitted at the lower end of the top cover 1 and fitted in the housing 200, i.e., the bent portion 24 does not interfere with the fitting of the top cover 1. By fitting the bent portion 24 into the housing 200, the housing 200 can protect the bent portion 24, and the bent portion 24 can guide the flow well.

In one embodiment of the present invention, the negative electrode tab 2 further includes: the second main body part 23 is arranged on the first main body part 22, the second main body part 23 extends in the vertical direction, and the orthographic projection of the second main body part 23 is positioned inside the orthographic projection of the backing plate 12, so that the second main body part 23 and the first main body part 22 are parallel to each other, and the second main body part 23 can be conveniently connected with the negative electrode tab. Further, by locating the orthographic projection of the second body portion 23 inside the orthographic projection of the pad 12, after the top cover 1 is fitted on the housing 200, the second body portion 23 can be fitted inside the housing 200, so that the housing 200 can protect the second body portion 23.

In one example, the second body portion 23 is disposed between two adjacent first pole claws 221, so that the second body portion 23 is located inside the first body portion 22, and thus, after the top cover 1 is fitted on the housing 200 by locating the orthographic projection of the first body portion 22 inside the orthographic projection of the backing plate 12, the first body portion 22 and the second body portion 23 can be fitted inside the housing 200, so that the housing 200 can protect the first body portion 22 and the second body portion 23.

In another embodiment of the present invention, the negative electrode tab 2 further includes: and the second main body part 23 is arranged below the connecting sheet 21 and extends along the vertical direction, and the orthographic projections of the first main body part 22 and the second main body part 23 are both positioned inside the orthographic projection of the cushion plate 12.

In one example, the first body portion 22 is located at a front end of the second body portion 23. In another example, the first body portion 22 is located at a rear end of the second body portion 23. By locating the orthographic projections of the first main body part 22 and the second main body part 23 inside the orthographic projection of the pad 12, after the top cover 1 is fitted on the housing 200, the first main body part 22 and the second main body part 23 can be fitted in the housing 200, so that the housing 200 can protect the first main body part 22 and the second main body part 23.

In some embodiments of the present invention, the top cap 1 is provided with a negative electrode pillar 3, the negative electrode connecting piece 2 is connected to a lower end of the negative electrode pillar 3, and the negative electrode connecting piece 2 includes: the connecting piece 21, the first main body part 22 and the second main body part 23, the first main body part 22 is arranged between the connecting piece 21 and the second main body part 23, the first main body part 22 comprises at least two first pole claws 221, the second main body part 23 comprises at least two second pole claws 231, the first pole claws 221 and the second pole claws 231 extend along the vertical direction, and the first pole claws 221 and the second pole claws 231 are connected with the negative electrode lug at one end of the battery cell.

That is, the negative electrode connecting piece 2 is fitted under the top cap 1 and allows the lower end of the negative electrode tab 3 to be connected to the connecting piece 21, so that current can flow better from the battery cell to the negative electrode tab 3 through the connecting piece 21 in order and then flow out, so that the battery 1000 can be used better.

For example, as shown in fig. 2, the first body portion 22 is provided below the connecting piece 21, and the second body portion 23 is provided on the first body portion 22. The first body portion 22 includes at least two first pole fingers 221 and the second body portion 23 includes at least two second pole fingers 231 such that the negative tab 2 includes at least four pole fingers. Further, the first pole claw 221 may be connected to the negative electrode tab of the battery cell, and the second pole claw 231 may also be connected to the negative electrode tab of the battery cell, so that the negative electrode connection piece 2 may be connected to a plurality of battery cells in a matching manner by providing a plurality of first pole claws 221 and second pole claws 231, so that a plurality of battery cells may be provided in the square battery 1000, and the power storage capacity of the square battery 1000 may be improved.

By providing the first tab 221 and the second tab 231 each extending in the up-down direction, the first tab 221 and the second tab 231 can be more easily connected to the negative electrode tab. Through all linking to each other first utmost point claw 221 and second utmost point claw 231 with the negative pole ear of electric core one end for negative pole connection piece 2 cooperation is behind battery 1000's side, not only makes can not take place to rock in its casing 200 after square battery 1000 assembles, thereby can prevent that electric core from squinting by a wide margin, and then makes square battery 1000's overall structure stable. Meanwhile, the negative electrode connecting piece 2 and the positive electrode connecting piece 21 can be separated, so that the positive electrode connecting piece 21 and the negative electrode connecting piece 2 are not connected, and the safety and the service life of the square battery 1000 can be improved.

It is understood that the number of the second claws 231 and the first claws 221 may be odd or even, and there is no relation between the number of the second claws 231 and the number of the first claws 221.

According to the secondary cap 100 of the embodiment of the invention, the negative electrode connecting piece 2 comprises at least four polar claws by enabling the first main body part 22 to comprise at least two first polar claws 221 and the second main body part 23 to comprise at least two second polar claws 231. Further, the first pole claw 221 may be connected to the negative electrode tab of the battery cell, and the second pole claw 231 may also be connected to the negative electrode tab of the battery cell, so that the negative electrode connection piece 2 may be connected to a plurality of battery cells in a matching manner by providing a plurality of first pole claws 221 and second pole claws 231, so that a plurality of battery cells may be provided in the square battery 1000, and the power storage capacity of the square battery 1000 may be improved.

In one embodiment, the first pole claws 221 are provided in two, and the distances from the second main body portion 23 to the two first pole claws 221 are equal, that is, the first main body portion 22 is located at the middle position of the two first pole claws 221, and the distances between the adjacent two second pole claws 231 and the first pole claws 221 are equal.

Further, two second claws 231 are provided between two first claws 221, and the distance between each of the two second claws 231 and the adjacent first claw 221 is equal, for example, as shown in fig. 4, the distance between the first claw 221 positioned on the front side and the second claw 231 positioned on the front side of the second body portion 23 is denoted as a1, the distance between the first claw 221 positioned on the rear side and the second claw 231 positioned on the rear side of the second body portion 23 is denoted as a2, and the distance between the adjacent second claws 231 is denoted as B. In one example, a1 is equal to a2 and a1 is equal to a2, both less than B. In another example, a1 is equal to a2 and a1 is equal to a2 is greater than B. In still other examples, a1 is not equal to a 2. Thus, by providing a different arrangement of a1, a2 and B, the first pole piece 221 and the second pole piece 231 can be easily connected to the negative tab, and the efficiency of assembly of the prismatic battery 1000 can be improved.

In some embodiments of the present invention, the first pole claws 221 and the second pole claws 231 are arranged alternately, that is, both sides of the second pole claw 231 are the first pole claws 221, so that the distance between adjacent pole claws can be adjusted, so that the negative electrode connecting piece 2 can be conveniently connected with a battery cell.

The present invention also proposes a prismatic battery 1000 having the secondary top cap 100 of the above embodiment.

The square battery 1000 according to the embodiment of the second aspect of the invention includes: a housing 200 and a secondary cap 100. Specifically, an installation space with an open opening is formed on the casing 200, the battery cell is disposed in the installation space, and after the secondary top cover 100 is matched with the open opening, the negative electrode connecting piece 2 of the secondary top cover 100 is located in the installation space.

Therefore, according to the square battery 1000 of the embodiment of the invention, after the second top cover 1 is matched with the opening, the negative electrode connecting piece 2 of the secondary top cover 100 is positioned in the installation space, so that the negative electrode connecting piece 2 can be connected with the negative electrode tab of the battery cell more safely, thereby improving the safety of the square battery 1000, and meanwhile, the negative electrode connecting piece 2 is positioned at the left or right end of the square battery 1000, so that the positive electrode connecting piece and the negative electrode connecting piece 2 are separated, thereby improving the stability of the whole structure of the square battery 1000, and further improving the service life of the square battery 1000.

Other configurations and operations of the prismatic battery 1000 according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "some embodiments," "optionally," "further," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A secondary top cap for a prismatic battery, comprising:

the top cover is provided with a negative pole column;

a negative connection tab, the negative connection tab comprising: the connecting piece is suitable for being connected with the lower end of the negative pole column, the first main body portion is arranged below the connecting piece, the first main body portion comprises a plurality of first polar claws which are connected with the negative pole lug at one end of the battery core, and the distance between every two adjacent first polar claws is equal to the distance between every two negative pole lugs.

2. The secondary top cap for a prismatic battery according to claim 1, wherein the plurality of first pole claws each extend in a vertical direction and have the same length.

3. The secondary cap for a prismatic battery according to claim 1, wherein the first pole claw extends for a length less than a cell height.

4. The secondary top cap for a prismatic battery according to claim 1, wherein a plurality of the first pole claws are arranged at intervals in a first direction, and a distance between the first pole claws at both ends of the plurality of the first pole claws is smaller than a width of the top cap.

5. The secondary top cap for a prismatic battery as claimed in claim 1, wherein the negative electrode connecting tab further comprises: a second main body portion, the second main body portion is disposed on the first main body portion and located between two adjacent first pole claws, the second main body portion includes: and the second pole claw extends along the vertical direction and is connected with the negative pole lug at one end of the battery cell.

6. The secondary top cap for a prismatic battery according to claim 5, wherein the second tab is provided in plurality, the plurality of second tabs being arranged at intervals in the second direction,

the distance between the second pole claw and the first pole claw is smaller than the distance between two adjacent second pole claws.

7. The secondary top cap for a prismatic battery according to claim 4, wherein an end of the first tab remote from the top cap is at the same level as an end of the second tab remote from the top cap.

8. The secondary top cap for a prismatic battery as claimed in claim 1, wherein the negative electrode connecting tab further comprises: one end of the bending part is connected with the connecting sheet, and the other end of the bending part extends towards the direction perpendicular to the connecting sheet and is connected with the first main body part.

9. The secondary top cap for a prismatic battery according to claim 1, further comprising: the connecting piece wraps the outer sides of the first main body part and the second main body part so as to enable the first main body part and the second main body part to be fixedly connected.

10. A prismatic battery, comprising:

the battery comprises a shell, a battery body and a battery core, wherein an installation space with an open opening is formed on the shell, and the battery core is arranged in the installation space;

the secondary top cover is according to any one of claims 1-9, and after the secondary top cover is matched with the opening, the negative connecting piece of the secondary top cover is located in the installation space.

Images