阅读说明：本技术 集流体组件、电池单体和电池包 (Current collector assembly, battery monomer and battery pack ) 是由 周龙 郭敏 于 2021-07-14 设计创作，主要内容包括：本发明公开了一种集流体组件、电池单体和电池包,所述集流体组件包括：至少两个极耳组,每个所述极耳组包括多个层叠设置的极耳；导电连接构件,所述导电连接构件包括至少三个导电连接片,至少三个所述导电连接片在所述导电连接片的厚度方向上间隔排布,相邻两个所述导电连接片之间叠设有一个所述极耳组,且相邻两个所述导电连接片中的至少一个与所述极耳组中的每个所述极耳电连接。根据本发明实施例的集流体组件,可以降低导电连接片和极耳组的焊接难度,避免出现假焊或虚焊,保证焊接效果,提高电流的过流能力。(The invention discloses a current collector assembly, a battery monomer and a battery pack, wherein the current collector assembly comprises: at least two pole ear groups, wherein each pole ear group comprises a plurality of pole ears which are arranged in a stacked mode; the conductive connecting component comprises at least three conductive connecting sheets, the conductive connecting sheets are arranged at intervals in the thickness direction of the conductive connecting sheets, one of the conductive connecting sheets is arranged between every two adjacent conductive connecting sheets in a stacked mode, and at least one of the conductive connecting sheets is electrically connected with each electrode lug in the electrode lug group. According to the current collector assembly provided by the embodiment of the invention, the welding difficulty of the conductive connecting sheet and the lug group can be reduced, the false welding or the false welding is avoided, the welding effect is ensured, and the overcurrent capacity of current is improved.)

1. A current collector assembly, comprising:

at least two pole ear groups, wherein each pole ear group comprises a plurality of pole ears which are arranged in a stacked mode;

the conductive connecting component comprises at least three conductive connecting sheets, the conductive connecting sheets are arranged at intervals in the thickness direction of the conductive connecting sheets, one of the conductive connecting sheets is arranged between every two adjacent conductive connecting sheets in a stacked mode, and at least one of the conductive connecting sheets is electrically connected with each electrode lug in the electrode lug group.

2. The current collector assembly of claim 1, wherein at least one of the two adjacent conductive connecting sheets is provided with a protrusion, and the protrusion penetrates through the tab group and is electrically connected to each tab of the tab group.

3. The current collector assembly of claim 2, wherein the protrusion is integrally formed with the conductive tab; or the bulges are welded, bonded, inserted or clamped on the conductive connecting sheet.

4. The current collector assembly of claim 2, wherein the plurality of protrusions are arranged in a matrix on the conductive patch.

5. The current collector assembly of claim 2, wherein a cross-section of the protrusion perpendicular to the protrusion height direction of the protrusion is the same in the protrusion height direction of the protrusion.

6. The current collector assembly of claim 2, wherein a cross-section of the protrusion perpendicular to a direction of a protrusion height of the protrusion decreases in the direction of the protrusion height of the protrusion.

7. The current collector assembly of claim 6, wherein the protrusion comprises a main body section and a piercing section connected in a height direction of the protrusion, the main body section is disposed on the conductive connection piece, the piercing section is adapted to pierce the tab group, a cross section of the main body section is the same and a cross section of the piercing section is gradually reduced in the protruding height direction, and the main body section is electrically connected with each tab of the tab group.

8. The current collector assembly of claim 2, wherein the protrusions are convex.

9. The current collector assembly of claim 8, wherein the protrusions are pyramidal, conical, truncated pyramidal, truncated circular, cylindrical, or rectangular posts.

10. The current collector assembly of claim 8, wherein the protrusions are a plurality of protrusions, and the protrusions are arranged more densely in the ultrasonic vibration direction than in other directions except the ultrasonic vibration direction.

11. The current collector assembly of claim 2, wherein the protrusions are elongated.

12. The current collector assembly of claim 11, wherein a cross-section of the protrusions perpendicular to a direction of extension of the protrusions is triangular or trapezoidal; or, the arch includes bellied direction of height's main part section and puncture section that links to each other, the main part section is established on the electrically conductive connection piece, the main part section with every of utmost point ear group utmost point ear electricity is connected, the puncture section is suitable for impaling utmost point ear group, the perpendicular to of main part section the cross-section of bellied extending direction is the rectangle, the perpendicular to of puncture section the cross-section of bellied extending direction is triangle-shaped or trapezoidal.

13. The current collector assembly of claim 11, wherein the protrusions are a plurality of protrusions, the plurality of protrusions are spaced apart in a direction perpendicular to the direction of ultrasonic vibration, and each protrusion extends in the direction of ultrasonic vibration.

14. The current collector assembly of claim 2, wherein each of the tabs comprises a non-conductive film and conductive layers disposed on opposite sides of the non-conductive film in a thickness direction, and at least one of two adjacent conductive connecting tabs is electrically connected to the conductive layer of each of the tabs of the tab set.

15. The current collector assembly of claim 2, wherein one end of the protrusion is connected to one of two adjacent conductive tabs, and the other end of the protrusion passes through the lug group and is connected to the other of two adjacent conductive tabs.

16. The current collector assembly of any one of claims 2-15, wherein the number of the tab sets is two, the number of the conductive connecting tabs is three, and the three conductive connecting tabs are sequentially a first conductive connecting tab, a second conductive connecting tab and a third conductive connecting tab along the arrangement direction of the conductive connecting tabs, wherein the protrusions are formed on the first conductive connecting tab and the third conductive connecting tab or the protrusions are formed on two opposite sides of the second conductive connecting tab in the thickness direction.

17. A battery cell, comprising: the current collector assembly of any of claims 1-16.

18. A battery pack, comprising: the battery cell of claim 17.

Technical Field

The invention relates to the technical field of batteries, in particular to a current collector assembly, a battery monomer and a battery pack with the same.

Background

In the prior art, each layer of tab of the battery core needs to be welded with tabs of other layers, when the capacity of the battery needs to be increased, the number of layers of the tab of the battery core is correspondingly increased, the difficulty of welding is correspondingly increased due to the increase of the number of layers of the tab, the phenomena of insufficient welding, false welding and the like easily occur, the connection quality of the multi-layer tab is poor, and therefore the current overcurrent capacity is reduced.

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 current collector assembly, which has low welding difficulty and can better ensure a welding effect, so that the current collector assembly has better electrical connection stability and current overcurrent capability.

The invention also provides a battery cell with the current collector assembly.

The invention also provides a battery pack with the battery cell.

A current collector assembly according to an embodiment of the present invention includes: at least two pole ear groups, wherein each pole ear group comprises a plurality of pole ears which are arranged in a stacked mode; the conductive connecting component comprises at least three conductive connecting sheets, the conductive connecting sheets are arranged at intervals in the thickness direction of the conductive connecting sheets, one of the conductive connecting sheets is arranged between every two adjacent conductive connecting sheets in a stacked mode, and at least one of the conductive connecting sheets is electrically connected with each electrode lug in the electrode lug group.

According to the current collector assembly provided by the embodiment of the invention, the multi-layer superposed tabs are divided into at least two tab groups, so that the thickness of each tab group is reduced, when the tab groups and the conductive connecting sheets are welded by using an ultrasonic welding technology, the electrical connection between each tab in the tab groups and the conductive connecting sheets is easier to realize, the welding difficulty is reduced, and the false welding or the false welding is avoided, so that the welding effect and the overcurrent capacity of current are ensured; simultaneously, every utmost point ear group all presss from both sides and establishes between two adjacent electrically conductive connection pieces for the electric connection of utmost point ear group and electrically conductive connection piece is more stable, is favorable to improving the holistic reliability of electric core.

According to some embodiments of the invention, at least one of the two adjacent conductive connecting sheets is provided with a protrusion, and the protrusion penetrates through the pole lug group and is electrically connected with each pole lug of the pole lug group.

Further, the protrusion and the conductive connecting sheet are integrally formed; or the bulges are welded, bonded, inserted or clamped on the conductive connecting sheet.

In some embodiments, the protrusions are arranged in a matrix on the conductive connecting sheet.

According to some embodiments of the invention, a cross section of the protrusion perpendicular to the protrusion height direction of the protrusion is the same in the protrusion height direction of the protrusion.

In other embodiments, a cross-section of the protrusion perpendicular to the protrusion height direction of the protrusion decreases in the protrusion height direction of the protrusion.

Further, the protrusion comprises a main body section and a puncture section which are connected in the height direction of the protrusion, the main body section is arranged on the conductive connecting sheet, the puncture section is suitable for puncturing the lug group, in the height direction of the protrusion, the cross sections of the main body section are the same and gradually decrease, and the main body section is electrically connected with each lug of the lug group.

According to some embodiments of the invention, the protrusions are convex.

Further, the protrusion is in a pyramid shape, a cone shape, a truncated pyramid shape, a truncated cone shape, a cylindrical shape or a rectangular column shape.

In some embodiments, the protrusions are a plurality of protrusions arranged in a greater density in the ultrasonic vibration direction than in other directions other than the ultrasonic vibration direction.

According to some embodiments of the invention, the protrusions are elongated.

Further, the cross section of the protrusion perpendicular to the extending direction of the protrusion is triangular or trapezoidal; or, the arch includes bellied direction of height's main part section and puncture section that links to each other, the main part section is established on the electrically conductive connection piece, the main part section with every of utmost point ear group utmost point ear electricity is connected, the puncture section is suitable for impaling utmost point ear group, the perpendicular to of main part section the cross-section of bellied extending direction is the rectangle, the perpendicular to of puncture section the cross-section of bellied extending direction is triangle-shaped or trapezoidal.

In some embodiments, the protrusions are a plurality of protrusions, the plurality of protrusions are arranged at intervals in a direction perpendicular to the ultrasonic vibration direction, and each of the protrusions extends in the ultrasonic vibration direction.

According to some embodiments of the invention, each of the tabs comprises a non-conductive film and conductive layers provided on opposite sides of the non-conductive film in a thickness direction, and at least one of the adjacent two conductive connecting pieces is electrically connected to the conductive layer of each of the tabs of the group of tabs.

According to some embodiments of the invention, one end of the protrusion is connected to one of the two adjacent conductive connection pads, and the other end of the protrusion passes through the pole lug group and is connected to the other of the two adjacent conductive connection pads.

In a specific example, the two sets of the pole lug groups are provided, the number of the conductive connecting pieces is three, the three conductive connecting pieces are sequentially a first conductive connecting piece, a second conductive connecting piece and a third conductive connecting piece along the arrangement direction of the conductive connecting pieces, wherein the first conductive connecting piece and the third conductive connecting piece are both provided with the protrusions or the protrusions are both formed on two opposite sides of the second conductive connecting piece in the thickness direction.

A battery cell according to a second aspect of the invention includes: the current collector assembly according to the first aspect of the present invention.

According to the single battery provided by the embodiment of the invention, by arranging the current collector assembly in the first aspect, the single battery has better current overcurrent capacity, stable current output is facilitated, the reliability of the single battery is increased due to the fact that the connection between the pole lug group and the conductive connecting sheet is more stable, and meanwhile, the single battery can improve the battery capacity and the cruising ability by increasing the number of pole pieces.

A battery pack according to a third aspect of the invention includes: the battery cell according to the second aspect of the invention.

According to the battery pack provided by the embodiment of the invention, the battery monomer in the second aspect is arranged, so that the reliability of the battery pack can be improved, and meanwhile, the endurance of the battery pack can be 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 view of a current collector assembly according to some embodiments of the present invention;

fig. 2 is a side view of an embodiment of the current collector assembly shown in fig. 1;

FIG. 3 is an enlarged view of encircled portion A in FIG. 2;

fig. 4 is a side view of another embodiment of the current collector assembly shown in fig. 1;

FIG. 5 is an enlarged view of circled portion B of FIG. 4;

FIG. 6 is a schematic view of one embodiment of a conductive tab according to an embodiment of the invention;

FIG. 7 is a schematic view from another perspective of the conductive tab shown in FIG. 6;

FIG. 8 is a schematic view of another embodiment of a conductive tab according to an embodiment of the invention;

FIG. 9 is a schematic view from another perspective of the conductive tab shown in FIG. 8;

FIG. 10 is a schematic view of yet another embodiment of a conductive tab according to an embodiment of the invention;

fig. 11 is a schematic view from another perspective of the conductive tab shown in fig. 10;

FIG. 12 is a schematic view of yet another embodiment of a conductive tab according to an embodiment of the invention;

fig. 13 is a schematic view from another perspective of the conductive tab shown in fig. 12;

fig. 14 is a sectional view of a tab according to an embodiment of the present invention.

Reference numerals:

current collector assembly 100:

the electrode tab group 1, the electrode tab 11, the non-conductive film 111, the conductive layer 112, the conductive connecting member 2, the conductive connecting piece 21, the first conductive connecting piece 21a, the second conductive connecting piece 21b, the third conductive connecting piece 21c, the protrusion 22, the main body section 221, and the piercing section 222.

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.

A current collector assembly 100 according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 14.

Referring to fig. 1 to 5, a current collector assembly 100 according to an embodiment of the first aspect of the present invention may include: at least two pole ear groups 1 and an electrically conductive connecting member 2.

Specifically, the battery cell may include a plurality of pole pieces, the plurality of pole pieces are stacked, each pole piece may include a body and a tab 11, the tab 11 is connected to the body, the tab 11 of the stacked arrangement of all the pole pieces may be divided into at least two tab groups 1, that is, each tab group 1 may include a plurality of tabs 11 stacked.

The conductive connecting member 2 may include at least three conductive connecting sheets 21, the at least three conductive connecting sheets 21 are arranged at intervals along a thickness direction (for example, an up-down direction shown in fig. 2 or fig. 4) of the conductive connecting sheets 21, one tab group 1 is stacked between two adjacent conductive connecting sheets 21, and at least one of the two adjacent conductive connecting sheets 21 is electrically connected to each tab 11 in the tab group 1, so that current on all the tabs 11 can be converged onto the conductive connecting sheets 21.

For example, as shown in fig. 2 and 3 and fig. 4 and 5, the current collector assembly 100 may include two tab groups 1 and a conductive connecting member 2, wherein the conductive connecting member 2 includes three conductive connecting tabs 21, the three conductive connecting tabs 21 are spaced apart in the up-down direction, a gap is defined between any adjacent two of the three conductive connecting tabs 21, that is, the three conductive connecting tabs 21 define two spaced gaps, and the two tab groups 1 are respectively disposed in the two gaps, so that the three conductive connecting tabs 21 and the two tab groups 1 form an alternately stacked structure in the up-down direction.

Because usually when increasing the free capacity of battery, can increase the quantity of pole piece, so can lead to the whole thickness of the anodal utmost point ear of electric core or negative pole utmost point ear also to increase thereupon, so, when utilizing ultrasonic welding technique antipodal ear group and conductive connection piece to weld, can increase the welding degree of difficulty of conductive connection piece and utmost point ear group, lead to conductive connection piece to be difficult to realize the electricity with every utmost point ear in every utmost point ear group even and be connected, lead to appearing the false welding, the performance degradation of electric core.

According to the current collector assembly 100 of the embodiment of the invention, the tab 11 stacked in multiple layers is divided into at least two tab groups 1, each tab group 1 is clamped between two adjacent conductive connecting sheets 21, so that the thickness of each tab group 1 is reduced, when the tab groups 1 and the conductive connecting sheets 21 are welded by using an ultrasonic welding technology, the electrical connection between each tab 11 in the tab groups 1 and the conductive connecting sheets 21 is easier to realize, the welding difficulty is reduced, false welding and false welding are avoided, the welding quality is ensured, the connection between the tab groups 1 and the conductive connecting sheets 21 is more stable, the overcurrent capacity of current is improved, and the overall reliability of the battery cell is improved.

According to some embodiments of the invention, referring to fig. 2 and 4, at least one of the two adjacent conductive connecting sheets 21 is provided with a protrusion 22, the protrusion 22 is arranged through the pole ear group 1, and the protrusion 22 can be electrically connected with each pole ear 11 in the pole ear group 1. For example, as shown in fig. 2, the conductive connecting member 2 includes a first conductive connecting sheet 21a, a second conductive connecting sheet 21b and a third conductive connecting sheet 21c which are arranged at an interval from top to bottom, and a protrusion 22 may be formed on any two of the first conductive connecting sheet 21a, the second conductive connecting sheet 21b and the third conductive connecting sheet 21c, or a protrusion 22 may be formed on each of the first conductive connecting sheet 21a, the second conductive connecting sheet 21b and the third conductive connecting sheet 21c, so that after the connection between the conductive connecting sheet 21 and the tab set 1 is realized by using the ultrasonic welding technology, the protrusion 22 may be electrically connected with each tab 11 in the tab set 1, so that the current on all the tabs 11 may be converged to the conductive connecting sheet 21 through the protrusion 22, and meanwhile, the protrusion 22 is inserted into the tab set 1, so as to increase the stability and reliability of the electrical connection between the conductive connecting sheet 21 and the tab set 1, in addition, utilize the in-process of ultrasonic bonding technique welding conductive connection piece 21 and utmost point ear group 1, every utmost point ear 11 in the utmost point ear group 1 is impaled more easily to arch 22, reduces the welding degree of difficulty, avoids appearing false welding and rosin joint, and then is favorable to improving welding efficiency and welding quality.

Further, the protrusion 22 and the conductive connecting sheet 21 can be integrally formed, so that the connection strength of the protrusion 22 and the conductive connecting sheet 21 can be further improved, and the processing technology is simplified; alternatively, the protrusion 22 may be welded, adhered, inserted or snapped to the conductive connecting piece 21, thereby achieving a simple structure.

In some embodiments, referring to fig. 2 to 13, the protrusions 22 may include a plurality of protrusions 22, and the plurality of protrusions 22 may be arranged on the conductive connecting sheet 21 in a matrix manner, so that on one hand, the contact area between the conductive connecting sheet 21 and each tab 11 in the tab group 1 may be increased, and the overcurrent capability may be improved; on the other hand, the conductive connecting piece 21 is connected with the pole lug group 1 through the plurality of protrusions 22, so that the stability and reliability of connection can be further improved.

According to some embodiments of the present invention, in the protruding height direction of the protrusion 22, the cross section of the protrusion 22 perpendicular to the protruding height direction of the protrusion 22 is the same, in other words, in the direction perpendicular to the conductive connection sheet 21 and away from the conductive connection sheet 21, the cross section area of the protrusion 22 parallel to the conductive connection sheet 21 is equal everywhere, so that, when the protrusion 22 is connected to the tab set 1, the contact area of the protrusion 22 and each tab 11 in the tab set 1 is the same, which is beneficial to balancing the current overcurrent capacity at the connection of the protrusion 22 and each tab 11, so that the heat generation is uniform and the heat dissipation is easy; in addition, the structure is simple, and the processing is convenient.

In other embodiments, referring to fig. 6-13, in the protruding height direction of the protrusion 22 (for example, the up-down direction shown in fig. 8), the cross section of the protrusion 22 perpendicular to the protruding height direction of the protrusion 22 is reduced, for example, as shown in fig. 8, the cross section area of the protrusion 22 is gradually reduced in the direction perpendicular to the conductive connection piece 21 and away from the conductive connection piece 21, so that the piercing capability of the protrusion 22 on the tab group 1 can be improved, and the welding efficiency and the welding effect of the conductive connection piece 21 and the tab group 1 can be improved.

Alternatively, referring to fig. 6, 10 and 12, the protrusion 22 may include a main body section 221 and a piercing section 222, and the main body section 221 and the piercing section 222 may be connected in the height direction of the protrusion 22, wherein the main body section 221 is disposed on the conductive connecting sheet 21, the piercing section 222 is adapted to pierce through the tab group 1, and in the protrusion height direction of the protrusion 22, the main body section 221 has the same cross section and the piercing section 222 has a gradually decreasing cross section, so that the piercing capability of the protrusion 22 on the tab group 1 can be improved, and the structural strength of the main body section 221 can be ensured; in addition, the main body section 221 is electrically connected with each tab 11 in the tab group 1, so that the contact areas of the main body section 221 and each tab 11 in the tab group 1 are the same, which is beneficial to balancing the current overcurrent capacity at the joint of the main body section 221 and each tab 11, and thus, the heat is generated uniformly and the heat is easy to dissipate.

For example, as shown in fig. 2 and 4, the protrusion 22 may include a main body section 221 and a piercing section 222, the main body section 221 is disposed on the conductive connecting piece 21, the piercing section 222 is connected to the main body section 221, the cross-sectional area of the piercing section 222 in the height direction of the protrusion is gradually reduced, after the welding between the tab set 1 and the conductive connecting piece 21 is completed, the main body section may be electrically connected to each tab 11 in the tab set 1, and the piercing section 222 may be electrically connected to the conductive connecting piece 21 on the other side of the tab set 1, thereby further improving the reliability of the connection between the conductive connecting piece 21 and the tab set 1, ensuring the welding quality, and improving the current flowing capability.

Alternatively, at least a part of the piercing section 222 of the protrusion 22 may be inserted into the conductive connecting piece 21 on the other side of the tab group 1, and it is necessary to avoid the piercing section 222 from piercing the conductive connecting piece 21 on the other side of the tab group 1, so that the welding quality can be ensured and the over-welding phenomenon can be avoided.

According to some embodiments of the present invention, referring to fig. 7, 9 and 13, the protrusions 22 are in a shape of a protruding dot, so that when the conductive connecting sheet 21 and the tab set 1 are welded by using an ultrasonic welding technique, ultrasonic energy can be concentrated on the protrusions 22, thereby greatly improving the piercing ability of the single protrusion 22 to the composite current collector, and further improving the welding quality, and meanwhile, the protrusions 22 have a simpler structure and are convenient to machine and form.

Further, referring to fig. 6 to 13, in the height direction of the protrusion 22, the cross-sectional area of the protrusion 22 parallel to the conductive connection pad 21 is gradually reduced, for example, the protrusion 22 may have a pyramid shape, a cone shape, a truncated pyramid shape, or a truncated cone shape; or, in the height direction of the protrusion 22, the cross-sectional area of the protrusion 22 parallel to the conductive connecting sheet 21 is the same, for example, the protrusion 22 may be formed into a cylindrical or rectangular column, specifically, the shape of the protrusion 22 may be reasonably selected according to actual needs, thereby having a simple structure and being convenient for processing.

In some embodiments, referring to fig. 7 and 9, the protrusions 22 may be plural, and the plurality of protrusions 22 may be arranged more densely in the ultrasonic vibration direction (e.g., the front-rear direction shown in fig. 9) than in the other directions (e.g., the left-right direction shown in fig. 9) than the ultrasonic vibration direction. In other words, the distance between two adjacent protrusions 22 in the ultrasonic vibration direction is smaller than the distance between two adjacent protrusions 22 in other directions (for example, perpendicular to the ultrasonic vibration direction), which is beneficial to fully utilizing the energy of the ultrasonic wave in the vibration direction, improving the piercing ability of the protrusions 22 to the tab set 1, avoiding the phenomena of false soldering and false soldering, and further improving the welding quality and welding efficiency of the tab set 1 and the conductive connecting sheet 21.

According to some embodiments of the present invention, referring to fig. 10 and 11, the protrusion 22 is elongated, as shown in fig. 11, the length direction of the protrusion 22 and the plane where the conductive connecting plate 21 is located are parallel to each other, so that after the conductive connecting plate 21 and the tab set 1 are welded, the contact area between a single protrusion 22 and each tab 11 in the tab set 1 can be increased, thereby increasing the current flowing capacity at the protrusion 22.

Further, the cross section of the protrusion 22 perpendicular to the extending direction of the protrusion 22 may be triangular or trapezoidal, that is, the cross section of the protrusion 22 parallel to the height direction may be triangular or trapezoidal, so that the cross-sectional area of the protrusion 22 parallel to the conductive connection piece 21 is gradually reduced in the height direction of the protrusion 22 and in the direction away from the conductive connection piece 21, so that the piercing ability of the protrusion 22 to the lug group 1 can be improved, thereby improving the welding effect.

Optionally, the protrusion 22 may include a main body section 221 and a piercing section 222, the main body section 221 and the piercing section 222 may be connected in the height direction of the protrusion 22, wherein the main body section 221 is disposed on the conductive connecting sheet 21, the piercing section 222 is adapted to pierce through the tab group 1, the cross section of the main body section 221 is the same in the protruding height direction of the protrusion 22, the main body section 221 is electrically connected with each tab 11 in the tab group 1, so that the contact area of the main body section 221 and each tab 11 in the tab group 1 is the same, the consistency of the connection of the main body section 221 and each tab 11 in the tab group 1 is ensured, the current overcurrent capacity at the connection of the main body section 221 and each tab 11 is equalized, so that heat generation is uniform, and heat dissipation is easy; the section of the piercing section 222 is gradually reduced, so that the piercing capability of the protrusion 22 on the lug group 1 can be improved, the problems of insufficient soldering, false soldering and the like are avoided, and the welding quality is ensured.

The section of the main body section 221 perpendicular to the extending direction of the protrusion 22 is rectangular, the section of the piercing section 222 perpendicular to the extending direction of the protrusion 22 is triangular or trapezoidal, in other words, in the height direction of the protrusion 22 and the direction away from the conductive connecting piece 21, the cross-sectional area of the main body section 221 parallel to the conductive connecting piece 21 is equal, and the cross-sectional area of the piercing section 222 parallel to the conductive connecting piece 21 is gradually reduced, so that the piercing capability of the protrusion 22 on the tab group 1 can be improved, and the structural strength of the protrusion 22 can be ensured.

In some embodiments, referring to fig. 11, the number of the protrusions 22 may be multiple, the multiple protrusions 22 are arranged at intervals perpendicular to the ultrasonic vibration direction, and each protrusion 22 extends along the ultrasonic vibration direction (e.g., the front-back direction shown in fig. 11), that is, when the protrusion 22 is formed in a strip shape, the length direction of the protrusion 22 is parallel to the ultrasonic vibration direction, which is beneficial to fully utilizing the ultrasonic vibration energy to improve the piercing capability and piercing efficiency of the protrusion 22 on the tab group 1, reduce the energy loss during ultrasonic welding, and avoid the defects of cold joint and false joint that may be brought about during welding, thereby improving the welding efficiency and welding quality.

According to some embodiments of the present invention, referring to fig. 14, each tab 11 may include a non-conductive film 111 and two conductive layers 112, the two conductive layers 112 are disposed on two opposite sides of the non-conductive film 111 in the thickness direction, at least one of the two adjacent conductive connection sheets 21 is electrically connected to the conductive layer 112 of each tab 11 of the tab set 1, that is, the tab 11 in this embodiment is made of a composite current collector material, since the composite current collector is different from a conventional copper foil, the two conductive layers 112 are insulated by the middle non-conductive film 111, while the present embodiment makes the protrusion 22 penetrate through the tab set 1, so that the protrusion 22 can be electrically connected to the two conductive layers 112 of each tab 11 in the tab set 1, that is, the protrusion 22 can be electrically connected to all the conductive layers 112 in the tab set 1, so that the current of the conductive layer 112 of each tab 11 in the tab set 1 can be converged to the conductive connection sheets 21 via the protrusion 22, thereby sufficiently securing the current-carrying capacity of the current collector assembly 100; in addition, the material consumption of the copper foil at the tab 11 is reduced, so that the overall weight of the current collector assembly 100 is reduced, and the cost is saved.

According to some embodiments of the present invention, referring to fig. 2 and 4, one end of the protrusion 22 may be connected to one of the two adjacent conductive connection pieces 21, and the other end of the protrusion 22 may penetrate through the tab set 1 and be connected to the other of the two adjacent conductive connection pieces 21, so that not only the conductive connection piece 21 and each tab 11 in the tab set 1 may be electrically connected, but also the three conductive connection pieces 21 may be electrically connected, thereby further improving the overcurrent capability of the current collector assembly 100, and at the same time, only one of the conductive connection pieces 21 needs to be connected to the positive terminal or the negative terminal of the battery, so as to achieve the current output of the battery cell.

For example, as shown in fig. 2, the conductive connecting member 2 may include a first conductive connecting piece 21a, a second conductive connecting piece 21b and a third conductive connecting piece 21c, which are arranged at intervals in the up-down direction, wherein the first conductive connecting piece 21a and the third conductive connecting piece 21c are both formed with a protrusion 22, the protrusion 22 of the first conductive connecting piece 21a and the protrusion 22 of the third conductive connecting piece 21c extend toward the second conductive connecting piece 21b, the protrusion 22 has a main body section 221 and a piercing section 222, wherein the piercing section 222 of the protrusion 22 of the first conductive connecting piece 21a and the third conductive connecting piece 21c can both penetrate through the tab set 1 and be connected with the second conductive piece 21b, and the piercing section 222 can be inserted into the second conductive piece 21b, and the main body section 221 can be electrically connected with each tab 11 in the tab set 1, so that the stability of the electrical connection between the tab set 1 and the conductive connecting piece 21 can be further improved, and the welding quality is ensured.

In a specific example, referring to fig. 2 and 3, the tab group 1 may include two groups, the number of the conductive connection tabs 21 may be three, and the three conductive connection tabs 21 are respectively a first conductive connection tab 21a, a second conductive connection tab 21b and a third conductive connection tab 21c, the first conductive connection tab 21a, the second conductive connection tab 21b and the third conductive connection tab 21c are arranged at intervals along the arrangement direction of the conductive connection tabs 21, wherein the first conductive connection tab 21a and the third conductive connection tab 21c are both formed with protrusions 22, and the protrusions 22 of the first conductive connection tab 21a and the protrusions 22 of the third conductive connection tab 21c extend toward the second conductive connection tab 21b, so that the present application can reduce the thickness of each tab group 1 by dividing all the tabs 11 into two tab groups 1, facilitates the protrusions 22 piercing the tab groups 1 to be electrically connected with each tab 11 in the tab groups 1, meanwhile, as the thickness of each pole ear group 1 is reduced, the protruding height of the protrusion 22 can be reduced, so that the phenomenon that the protrusion 22 is broken or abraded in welding process due to too high height is prevented, and meanwhile, the processing and forming of the protrusion 22 are facilitated.

Or in another example, referring to fig. 4 and 5, the tab group 1 may include two groups, the number of the conductive connection pieces 21 may be three, and the three conductive connection pieces 21 are respectively a first conductive connection piece 21a, a second conductive connection piece 21b and a third conductive connection piece 21c, the first conductive connection piece 21a, the second conductive connection piece 21b and the third conductive connection piece 21c are arranged at intervals along the arrangement direction of the conductive connection pieces 21, wherein the second conductive connection piece 21b is formed with protrusions 22 along both sides of the thickness direction, and the protrusions 22 of the second conductive connection piece 21b along both sides of the thickness direction extend towards the first conductive connection piece 21a and the third conductive connection piece 21c, so that the present application divides all the tabs 11 into two tab groups 1, which can reduce the thickness of each tab group 1, facilitate the protrusions 22 to pierce the tab group 1 to be electrically connected with each tab 11 in the tab group 1, meanwhile, as the thickness of each pole ear group 1 is reduced, the protruding height of the protrusion 22 can be reduced, so that the phenomenon that the protrusion 22 is broken or abraded in welding process due to too high height is prevented, and meanwhile, the processing and forming of the protrusion 22 are facilitated.

Alternatively, in other embodiments, the tab group 1 may include two groups, the number of the conductive connection pads 21 may be three, the three conductive connection pads 21 are respectively a first conductive connection pad 21a, a second conductive connection pad 21b and a third conductive connection pad 21c, the first conductive connection pad 21a, the second conductive connection pad 21b and the third conductive connection pad 21c are arranged at intervals along the arrangement direction of the conductive connection pads 21, wherein the first conductive connection pad 21a and the third conductive connection pad 21c are both formed with protrusions 22, the protrusions 22 on the first conductive connection pad 21a and the third conductive connection pad 21c extend towards the second conductive connection pad 21, meanwhile, the protrusions 22 are formed on both sides of the second conductive connection pad 21b along the thickness direction, the protrusions 22 on both sides of the second conductive connection pad 21b along the thickness direction extend towards the first conductive connection pad 21a and the third conductive connection pad 21c respectively, moreover, the protrusion 22 on the first conductive connecting sheet 21a and the protrusion 22 on one side of the second conductive connecting sheet 21b facing the first conductive connecting sheet 21a are staggered in the horizontal direction, and the protrusion 22 on the third conductive connecting sheet 21c and the protrusion 22 on one side of the second conductive connecting sheet 21b facing the third conductive connecting sheet 21c are staggered in the horizontal direction, so that the stability of connection between the conductive connecting sheet 21 and the tab group 1 is further improved, and the welding quality is ensured; meanwhile, as the number of the protrusions 22 is increased, the overcurrent capability of the current can be further improved.

A battery cell according to an embodiment of the second aspect of the invention is described below.

A battery cell according to a second aspect of the invention includes: according to the current collector assembly 100 of the above-described embodiment of the present invention, the current collector assembly 100 may be used for a positive electrode of a battery cell, and may also be used for a negative electrode of a battery cell.

According to the single battery provided by the embodiment of the invention, by arranging the current collector assembly 100 of the embodiment, the single battery has better current overcurrent capacity, stable current output is facilitated, the reliability of the single battery is increased due to the fact that the connection between the tab group 1 and the conductive connecting sheet 21 is more stable, and meanwhile, the single battery can improve the battery capacity and the cruising ability by increasing the number of the tabs.

A battery pack according to an embodiment of the third aspect of the invention is described below.

A battery pack according to a third aspect of the invention includes: the battery cell according to the above embodiment of the present invention.

According to the battery pack provided by the embodiment of the invention, the reliability of the battery pack can be improved by arranging the battery monomer of the embodiment, and meanwhile, the integral cruising ability of the battery pack is favorably improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the 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 and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, 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 specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

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.