CN218039726U - Battery core, battery module and battery pack - Google Patents

Abstract

The utility model relates to an electricity core, battery module and battery package, electricity core has the utmost point ear of buckling of nothing, no utmost point ear of buckling goes up laser welding and has the metalwork that is used for two electricity core cluster parallel connection. The utility model discloses an increase the metalwork on the no utmost point ear of bending of electric core to fix the metalwork on no utmost point ear of bending through no utmost point ear side laser welding of bending, can establish ties or parallelly connected through the metalwork with two electric cores as required, can effectively avoid current utmost point ear of bending and the connecting row because of the worry that the laminating is inseparable to cause welds the pseudo-welding phenomenon, improve and improved the welding effect, avoid generating heat that utmost point ear department drawing force is not enough/overflows not enough and arouse, voltage detection is unusual, gather the not enough scheduling problem of precision. Because the tab does not need to be folded, the electric core is prevented from being damaged by bending operation or bending stress. Because the metal part can be welded from the side surface of the non-bent lug, the workpiece can be effectively prevented from being penetrated by laser welding, and the damage to the battery cell in the process of production is avoided.

Description

Battery core, battery module and battery pack

Technical Field

The utility model relates to an electricity core correlation technique field, concretely relates to electricity core, battery module and battery package.

Background

Along with the improvement to the large capacity demand and the fast rate of charging of PACK battery, the required throughput capacity that bears of electricity core also requires bigger and bigger, in order to reach the overcurrent, the positive/negative pole material thickness size of electricity core needs the thickening. According to the existing process, the series/parallel connection between the battery cores is realized by adopting a 90-degree bending mode of tabs and plastic supports to be attached to a bus aluminum bar or a copper bar through laser welding. But the electrode lug cannot be folded by 90 degrees after being thickened, so that laser welding cannot be performed.

The existing single-head lug and double-head lug outlet battery cell is jointed with a connecting row by bending the lugs of the battery cell by 90 degrees and then is subjected to laser welding. The method comprises the following steps: as shown in fig. 1, the tab 2 of the battery cell 1 directly penetrates into the tab support 3 and the connecting bar 4, the arrow a indicates the assembling direction of the connecting bar 4, the arrow B indicates the assembling direction of the tab support 3, and foam 5 is arranged between the battery cells 1. As shown in fig. 2, the cell tabs are bent by 90 degrees and tightly attached to the connecting bar 4, and the cell tabs are bent in the manner shown in fig. 2, and are connected in series and in parallel by laser welding to form a laser welding spot 6, as shown in fig. 3. This structure is adapted to and overflows less battery module, because PACK large capacity demand, corresponds to the anodal/cathode material of electric core need bear great overflowing, in order to reach the flow area, influences 90 fifty percent discount behind the thickening of utmost point ear size, causes unable realization laser welding. And electric core utmost point ear department needs to increase the plastic support and holds the connecting row, again with electric core utmost point ear 90 welding of bending, this kind of mode can't realize laser welding to overflowing big, the electric core that utmost point ear size is thicker.

In addition, the prior art discloses a mode of adopting hot melt tin to weld the battery cell tab, easily produces worry to weld, gathers defects such as bad and internal resistance big, and the operation degree of difficulty is big moreover, easily produces short circuit between the battery cell to be not suitable for soft-packaged battery cell series-parallel connection.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve one kind or several kinds among the prior art technical problem, provide an electricity core, battery module and battery package.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides an electricity core, electricity core has the utmost point ear of buckling of nothing, no laser welding has the metalwork that is used for two electricity core series-parallel connections on the utmost point ear of buckling.

The utility model has the advantages that: the utility model discloses an increase the metalwork on the no utmost point ear of bending of electric core to fix the metalwork on no utmost point ear of bending through no utmost point ear side laser welding of bending, can establish ties or parallelly connected through the metalwork with two electric cores as required, can effectively avoid current utmost point ear of bending and the connecting row because of the worry that the laminating is inseparable to cause welds the pseudo-welding phenomenon, improve and improved the welding effect, avoid generating heat that utmost point ear department drawing force is not enough/overflows not enough and arouse, voltage detection is unusual, gather the not enough scheduling problem of precision. Because the pole lugs do not need to be folded, the electric core is prevented from being damaged due to bending operation or bending stress. Because the metal piece can be welded from the side face of the non-bent lug, the workpiece can be effectively prevented from being welded through by laser, and the damage to the battery cell in the process production process is avoided.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, a side surface of the metal piece, which is away from the welded non-bent tab, is a first butt surface for being directly welded with the non-bent tab of another cell.

The beneficial effect of adopting the above further scheme is: the non-bent lugs at the same ends of the two battery cores can be welded on the same or the same group of metal pieces, namely, one or the group of metal pieces are respectively welded with the two non-bent lugs, and only the metal pieces are welded on the non-bent lugs on the side faces of the non-bent lugs, and other welding processes are not needed.

Further, a side surface of the metal piece departing from the welded non-bent tab is a second butt-joint surface for welding with the metal piece on the non-bent tab of another cell.

The beneficial effect of adopting the above further scheme is: the metal parts can be welded on the non-bent lugs of the two battery cores respectively, and then the metal parts on the non-bent lugs are directly welded and fixed, so that the material cost is reduced, the times of an assembly process are reduced, and the production efficiency is improved. The metal parts on the two non-bent lugs can be connected and fixed through the connecting rows, and the structural strength is improved.

Furthermore, the metal piece is provided with a connecting bulge or a connecting hole or a connecting groove for connecting with the bus bar.

The beneficial effect of adopting the above further scheme is: in order to facilitate the follow-up busbar with other electric cores of basic electric core module to be connected, can set up the connecting hole or connect the arch on the metalwork, be convenient for follow-up and busbar are stable spacing and connect fixedly.

The utility model provides a battery module, includes a plurality of basic electric cores, and a plurality of basic electric cores are piled up and are formed electric core stack body, and at least one basic electric core adopts the structure of above-mentioned electric core.

The basic cell is a cell without a metal piece welded on a tab, and the tab of the cell can be a non-bent tab or a bent tab.

The utility model has the advantages that: the utility model discloses a battery module, at least one among a plurality of basic electric cores adopts above-mentioned electric core, avoids not having the not enough/overcurrent not enough of the pull-out force of utmost point ear department of buckling and generating heat, voltage detection unusual, the not enough scheduling problem of collection precision that arouses. Because the tab does not need to be folded, the electric core is prevented from being damaged by bending operation or bending stress. Because the metal part can be welded from the side surface of the non-bent lug, the workpiece can be effectively prevented from being penetrated by laser welding, and the damage to the battery cell in the process of production is avoided.

The utility model provides a battery module, includes a plurality of basic electric cores, and a plurality of basic electric cores are piled up and are formed electric core stack body, and at least one basic electric core adopts the structure of above-mentioned electric core, electric core welds through the first butt joint face of metalwork and the no utmost point ear of buckling of neighbouring basic electric core.

The utility model has the advantages that: the utility model discloses a battery module, with the metalwork that the welding has first butt joint face on the no utmost point ear of buckling of at least one basic electricity core, convenient and the no utmost point ear of buckling of neighbouring basic electricity core carries out welded fastening, simple process is convenient.

The utility model provides a battery module, includes a plurality of basic electric cores, and a plurality of basic electric cores are piled up and are formed electric core stack body, and two at least neighbouring basic electric cores adopt the structure of above-mentioned electric core, the second butt joint face that electric core passes through the metalwork welds with the second butt joint face of the metalwork on neighbouring electric core.

The beneficial effects of the utility model are that: the utility model discloses a battery module, with the metalwork that the welding has the second butt joint face on the no utmost point ear of buckling of at least one basic electric core, the metalwork on the utmost point ear of buckling is carried out welded fastening conveniently and neighbouring nothing, makes things convenient for electric core preparation, is favorable to setting up the battery module of different series-parallel connection forms.

Further, a gap is formed between at least part of the second butt joint surfaces of the metal pieces on the two battery cores.

The beneficial effect of adopting the above further scheme is: a certain buffer space is provided for welding the metal piece, and the influence on the battery cell after the laser penetrates through the battery cell is avoided.

A battery module comprises a plurality of basic battery cells, wherein the basic battery cells are stacked to form a battery cell stacking body, at least two basic battery cells adopt the structure of the battery cells, and the battery cells are welded with bending-free lugs adjacent to the basic battery cells through first butt-joint surfaces of metal pieces; the metal parts of the two battery cores are respectively welded with the bus bar through the connecting bulges or the connecting holes or the connecting grooves.

The utility model has the advantages that: the utility model discloses a battery module is favorable to being connected with the stable of busbar, also is convenient for follow-up and other electric cores that have the metalwork carry out the stable connection of connecting in series-parallel.

A battery pack comprises a battery box body and the battery module arranged in the battery box body.

The beneficial effects of the utility model are that: the utility model discloses a battery pack, electric core adoption does not have utmost point ear of buckling in it to carry out welded fastening through the metalwork, avoid utmost point ear department drawing force not enough/overflow not enough and the heating, voltage detection abnormal, the not enough scheduling problem of collection precision that arouses.

Drawings

Fig. 1 is a schematic view of a split structure of a battery tab assembly structure in the prior art;

FIG. 2 is a schematic front view of a prior art electrical core tab assembly structure after assembly;

FIG. 3 is a schematic top view of a prior art electrical core tab assembly structure after assembly;

fig. 4a is a schematic view of a structure of a metal member according to embodiment 2 of the present invention;

fig. 4b is a schematic view of another structure of a metal member according to embodiment 2 of the present invention;

fig. 5a is a schematic structural view of a connecting row according to embodiment 2 of the present invention;

fig. 5b is another schematic structural diagram of the connecting row according to embodiment 2 of the present invention;

fig. 6 is a schematic front view of the connection row and the metal member in accordance with embodiment 2 of the present invention;

fig. 7 is a schematic top view of the connection row and the metal member according to embodiment 2 of the present invention;

fig. 8 is a schematic perspective view of a three-dimensional structure of a connecting bar and a metal member according to embodiment 2 of the present invention;

fig. 9a is a schematic structural view of the assembly of a metal piece and a battery cell according to embodiment 2 of the present invention;

fig. 9b is a schematic structural diagram of the assembly of the connection bar and the battery cell in embodiment 2 of the present invention;

fig. 9c is a schematic view of a three-dimensional structure of the battery cell assembled with the connecting bar and the metal member according to embodiment 2 of the present invention;

fig. 9d is a schematic view of a split structure in which the connecting bar, the metal member, and the battery cell are fitted in embodiment 2 of the present invention;

fig. 10a is a first schematic view of a no-bending tab welding method according to embodiment 2 of the present invention;

fig. 10b is a schematic view of a second method for welding a non-bent tab according to embodiment 2 of the present invention;

fig. 11 is a schematic front view of a tab welding structure without bending according to embodiment 3 of the present invention;

FIG. 12 is an enlarged view of the portion A of FIG. 11;

fig. 13 is a schematic top view of a no-bending tab welding structure according to embodiment 3 of the present invention;

fig. 14a is a schematic view of a welding structure of a single tab without bending in embodiment 3 of the present invention;

fig. 14b is a schematic view of a 1P2S bending-free tab welding structure in embodiment 3 of the present invention;

fig. 14c is a schematic view of a 1P4S cell stacking structure in embodiment 3 of the present invention;

fig. 14d is a schematic view of a 1P4S bending-free tab welding structure in embodiment 3 of the present invention;

fig. 15a is a first schematic view of a no-bending tab welding method according to embodiment 3 of the present invention;

fig. 15b is a schematic view of a no-bending tab welding method according to embodiment 3 of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1. an electric core; 2. no bent tab is provided; 21. a bent tab is arranged; 3. a tab support; 4. a bus bar; 41. connecting holes; 5. soaking cotton; 6. laser welding spots; 7. a metal member; 71. a connecting projection; 8. a laser welding workbench; 81. the laser welding equipment emitting head.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

As shown in fig. 4a to fig. 15b, in the battery cell of the present embodiment, the battery cell 1 has a tab 2 without bending, and a metal piece 7 for series-parallel connection of two battery cells 1 is laser welded on the tab 2 without bending.

The metal member 7 of this embodiment may be made of a conductive and easily weldable metal, such as aluminum or copper, or other metal materials may be used.

Referring to fig. 10a, a method for welding a cell tab of this embodiment includes: adding a metal piece 7 between non-bent lugs 2 of two battery cores 1 and clamping, horizontally placing the clamped two battery cores 1 on a laser welding workbench 8, and performing laser welding on one side surface of the non-bent lug 2 through a laser welding equipment emission head 81; and turning over the two battery cores 1, and performing laser welding on the other side surface of the non-bent tab 2 through the emission head 81 of the laser welding equipment. The welding method of the embodiment has simple and reliable welding process.

The battery module of this embodiment includes a plurality of basic electric cores, and a plurality of basic electric cores are piled up and are formed electric core stack body, and at least one basic electric core adopts the structure of this embodiment electricity core 1. The battery module of the present embodiment can form a string of multiple parallel battery modules, a parallel multiple string of battery modules, or multiple parallel multiple strings of battery modules according to the production requirement.

This embodiment is through increasing the metalwork between two no bending utmost point ears to fix the metalwork on utmost point ear through no bending utmost point ear side laser welding, can set to series connection or parallelly connected basic electric core module as required, can effectively avoid current bending utmost point ear and the connecting bank because of the worry that the laminating is not closely caused welds the pseudo-welding phenomenon, improve and improved the welding effect, avoid utmost point ear department drawing force not enough/overflow not enough and arouse generate heat, voltage detection is unusual, gather the not enough scheduling problem of precision. Because the tab does not need to be folded, the electric core is prevented from being damaged by bending operation or bending stress. Because the metal part can be welded from the side surface of the lug, the workpiece can be effectively prevented from being penetrated by laser welding, and the damage to the battery cell in the process of production is avoided.

Example 2

As shown in fig. 4a to fig. 10b, on the basis of embodiment 1, one side surface of the metal piece 7 away from the welded non-bent tab 2 of this embodiment is a first butt surface for directly welding with the non-bent tab 2 of another electrical core 1. Can weld the no utmost point ear 2 of buckling of the same end of two electric cores 1 on same or same group of metalwork 7, even this one or same group of metalwork 7 all welds with two no utmost point ears 2 of buckling respectively, only need not buckle utmost point ear 2 side with the metalwork 7 weld on no utmost point ear 2 of buckling can, do not need other welding process.

The battery module of this embodiment, including a plurality of basic electric cores, a plurality of basic electric cores are piled up and are formed electric core stack body, and at least one basic electric core adopts above-mentioned electric core 1's structure, electric core 1 welds through the first butt joint face of metalwork 7 and the no utmost point ear 2 of buckling of neighbouring basic electric core. A plurality of battery cells 1 of the present embodiment are welded by metal members 7 to form a plurality of parallel battery cell strings (as shown in fig. 6).

As shown in fig. 10a, a method for welding a cell tab of this embodiment includes: adding a metal piece 7 between non-bent lugs 2 of two battery cores 1 and clamping, horizontally placing the clamped two battery cores 1 on a laser welding workbench 8, and performing laser welding on one side surface of the non-bent lug 2 through a laser welding equipment emission head 81; and turning over the two battery cores 1, and performing laser welding on the other side surface of the non-bent tab 2 through the emission head 81 of the laser welding equipment.

Further, as shown in fig. 10b, the method for welding a cell tab of this embodiment further includes: two no utmost point ears 2 of buckling weld respectively in same metalwork 7, put two electric cores 1 immediately on laser welding workstation 8, increase linkage 4 in the top of metalwork 7, pierce through the welding on metalwork 7 with linkage 4 laser through laser welding equipment emission head 81. Can be convenient for follow-up be connected with other electric cores through increase the run-on strip above the metalwork.

The welding method of the embodiment is suitable for the condition that the non-bent lugs of the two battery cells are welded on the same metal piece, and the welding process is simple and reliable.

In the embodiment, the metal piece with the first butt joint surface is welded on the non-bent tab of at least one basic battery cell, so that the metal piece is conveniently welded and fixed with the non-bent tab of the adjacent basic battery cell, and the process is simple and convenient.

Example 3

As shown in fig. 12 to fig. 15b, on the basis of embodiment 1, a side surface of the metal piece of this embodiment, which is away from the welded non-bent tab 2, is a second butt surface for welding with the metal piece 7 on the non-bent tab 2 of another electrical core 1. The metal parts can be welded on the non-bent lugs of the two battery cores respectively, and then the metal parts on the non-bent lugs are directly welded and fixed, so that the material cost is reduced, the times of an assembly process are reduced, and the production efficiency is improved.

In this embodiment, the electric core groups formed by the plurality of electric cores 1 may be two parallel electric core groups or two serial electric core groups. Then, different numbers of battery cells and connection modes are set according to actual needs, for example, multiple parallel battery cell groups can be formed by connecting multiple battery cells in parallel, or multiple serial battery cell groups can be formed by connecting multiple battery cells in series, as shown in fig. 14 d.

Specifically, as shown in fig. 11 and 12, the second abutting surface of the present embodiment is one or more of an L-shaped (as shown in fig. 12), S-shaped, [ shaped, < shaped, inclined, vertical, or zigzag shape. The second butt joint surfaces of different shapes can be selected for butt joint, and the second butt joint surfaces of the metal pieces on the two non-bent lugs are matched with each other, so that the stability of the structure is improved.

The battery cell tab welding structure solves the problem that the battery cell tab cannot be bent and welded due to thickening of the battery cell tab, is suitable for a scene of combination of a plurality of parallel batteries and a plurality of strings of batteries, is particularly suitable for series welding of a one-block and multi-string battery pack structure, and can set a specific series-parallel connection mode according to needs; the welding process does not need the assistance of a plastic support, so that the material cost is reduced, the times of an assembly process are reduced, and the production efficiency is improved; the butt joint surfaces are utilized for welding after butt joint, so that the situation that a workpiece is penetrated by laser welding due to the fact that a tool cannot be clamped in place can be effectively prevented, damage to an electric core in the process of production is avoided, chamfers can be arranged at edges and corners of the butt joint surfaces of metal pieces, and laser welding energy gathering and welding quality improvement are facilitated.

The battery module of this embodiment, including a plurality of basic electric cores, a plurality of basic electric cores are piled up and are formed the electric core stack body, and at least two neighbouring basic electric cores adopt the structure of above-mentioned electric core, the second butt joint face that electric core passes through the metalwork welds with the second butt joint face of the metalwork on the neighbouring electric core. A plurality of battery cells 1 of the battery module of the present embodiment are welded by metal pieces 7 to form a batch of battery cell modules (as shown in fig. 14 d).

As shown in fig. 15a and 15b, a method for welding a cell tab of this embodiment includes: horizontally placing an electric core 1 on a laser welding workbench 8, arranging a first metal piece on the lower side surface of a non-bent lug 2, and performing laser welding on the upper side surface of the non-bent lug through a laser welding equipment emission head 81 to ensure that the first metal piece is welded and fixed on the lower side surface of the non-bent lug 2;

horizontally placing the other electric core 1 on a laser welding workbench 8, arranging a second metal piece on the lower side surface of the non-bent lug 2, and enabling the second metal piece to be symmetrically arranged relative to the center of the first metal piece, and performing laser welding on the upper side surface of the non-bent lug 2 through an emission head 81 of laser welding equipment to enable the second metal piece to be fixed on the lower side surface of the non-bent lug 2 in a welding manner;

two battery cores welded with metal pieces are vertically placed on a laser welding workbench 8, the butt joint surface of the first metal piece is in butt joint with the butt joint surface of the second metal piece in a matching mode, and butt joint laser welding is conducted on the first metal piece and the second metal piece through a laser welding equipment emitting head 81.

The welding method of the embodiment is suitable for the condition that independent metal pieces are respectively welded on the non-bent lugs of the two battery cells, other connecting pieces do not need to be welded, and the two metal pieces which are arranged in the central symmetry mode can be subjected to butt welding.

The metal piece that has the second butt joint face of welding on the no bent utmost point ear of at least one basic electric core of this embodiment, convenient and the neighbouring metal piece on the no bent utmost point ear of buckling carries out welded fastening, makes things convenient for electric core preparation, is favorable to setting up the battery module of different series-parallel connection forms.

Example 4

As shown in fig. 11 and 12, on the basis of embodiment 3, a gap is formed between at least part of the second abutting surfaces of the metal pieces 7 on the two battery cells 1 of the present embodiment. A certain buffering space is provided for welding of metal pieces, and influence on the battery cell after laser penetration is avoided.

Example 5

As shown in fig. 6, on the basis of embodiment 2, an end surface of the metal piece of this embodiment, which faces away from the non-bent tab 2 to be welded, is a first butt surface for being directly welded to the non-bent tab 2 of another electrical core 1. And the metal piece is provided with a connecting bulge or a connecting hole or a connecting groove for connecting with the busbar.

The battery module comprises a plurality of basic battery cells, wherein the basic battery cells are stacked to form a battery cell stack body, at least two basic battery cells adopt the structure of the battery cell 1, and the battery cell 1 is welded with a bending-free lug 2 adjacent to the basic battery cell through a first butt joint surface of a metal piece 7; the metal pieces 7 of the two battery cells 1 are respectively welded with the bus bar 4 through the connecting protrusions 71 or the connecting holes or the connecting grooves.

A specific scheme of this embodiment is that, as shown in fig. 4a and 4b, a connection protrusion 71 or a connection hole or a connection groove is provided on the metal member 7, the metal members 7 of two adjacent basic battery cell modules are connected through the connection bar 4, as shown in fig. 5a and 5b, the connection bar 4 is provided with a connection hole 41 or a connection groove or a connection protrusion, and the connection bar 4 is limited on the metal member 7 through the cooperation of the connection hole 41 or the connection groove and the connection protrusion 71 and is welded and fixed with the metal member 7. In order to facilitate the follow-up and other electric cores of basic electric core module to be connected, can set up corresponding connection arch, connecting hole or spread groove on the metalwork or, be convenient for follow-up and the bank of connections is stable spacing and is connected fixedly.

As shown in fig. 4a to 5b, the connection hole 41 of the present embodiment may be a long hole, as shown in fig. 4b, or may be a plurality of dot holes, as shown in fig. 4 a. The corresponding connecting protrusion structure can also adopt a strip-shaped protrusion or a plurality of point-shaped protrusions.

In fig. 6, arrow a indicates the assembling direction of the connecting row 4, which is also the laser welding direction. Arrow a in fig. 7 indicates the laser welding direction. The arrow B in fig. 9a indicates the assembly direction of the metal piece 7.

As shown in fig. 4a and 4b, the metal member 7 of the present embodiment may be an aluminum rod or a copper rod, and both sides of the metal member 7 may have a welding surface, for example, a trapezoidal or square structure.

In the embodiment, the metal piece with the first butting face is provided with the connecting protrusion or the connecting hole or the connecting groove, so that the stable connection with the bus bar is facilitated, and the subsequent series-parallel stable connection with other battery cores with the metal pieces is facilitated.

Example 6

A battery pack according to this embodiment includes a battery case and the battery module according to any one of embodiments 1 to 5, which is disposed in the battery case.

The battery pack of this embodiment, electric core adoption does not have the utmost point ear of buckling in it to carry out welded fastening through the metalwork, avoid utmost point ear department not enough/overflow not enough and arouse generate heat, voltage detection abnormity, gather the not enough scheduling problem of precision.

In the description of the present invention, it should be understood that the terms "central symmetry", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. The battery core is characterized in that the battery core (1) is provided with a bending-free tab (2), and a metal piece (7) for connecting two battery cores (1) in series and parallel is welded on the side surface of the bending-free tab (2) in a laser mode.

2. The cell of claim 1, wherein a side of the metal part (7) facing away from the welded tab (2) without bending is a first butt surface for direct welding with a tab (2) without bending of another cell (1).

3. The cell of claim 1, wherein a side of the metal piece (7) facing away from the welded unbent tab (2) is a second butt surface for welding with the metal piece (7) on the unbent tab (21) of another cell (1).

4. The cell according to claim 2, wherein the metal part (7) is provided with a connection projection (71) or a connection hole or a connection groove for connecting with a busbar (4).

5. A battery module, comprising a plurality of basic cells stacked to form a cell stack, wherein at least one basic cell is in the structure of a cell (1) according to any one of claims 1 to 4.

6. A battery module, comprising a plurality of basic cells stacked to form a stack of cells, at least one of the basic cells having the structure of the cell (1) according to claim 2, wherein the cell (1) is welded to a non-bent tab (2) of an adjacent basic cell via a first mating surface of a metal member (7).

7. A battery module, comprising a plurality of basic cells stacked to form a stack of cells, wherein at least two adjacent basic cells adopt the structure of the cell (1) of claim 3, and wherein the cell (1) is welded to the second abutting surface of the metal member (7) on the adjacent cell (1) through the second abutting surface of the metal member (7).

8. The battery module according to claim 7, characterized in that a gap is formed between at least part of the second butt joint surfaces of the metal members (7) on the two battery cells (1).

9. A battery module, comprising a plurality of basic cells stacked to form a cell stack, wherein at least two basic cells adopt the structure of the cell (1) of claim 4, and the cell (1) is welded with a non-bent tab (2) of an adjacent basic cell through a first butt joint surface of a metal piece (7); the metal pieces (7) of the two battery cells (1) are respectively welded with the bus bar (4) through the connecting protrusions (71) or the connecting holes or the connecting grooves.

10. A battery pack, comprising a battery case and the battery module according to any one of claims 5 to 9 disposed in the battery case.

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