CN218039698U

CN218039698U - Single battery and battery module

Info

Publication number: CN218039698U
Application number: CN202220777177.2U
Authority: CN
Inventors: 舒宽金
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-12-13
Anticipated expiration: 2032-04-06

Abstract

The utility model belongs to the technical field of the battery, a battery cell and battery module is disclosed, this battery cell includes first terminal and second terminal, still includes: the first splicing part is arranged on the first terminal; the second splicing part is used for splicing with the first splicing part, and the second splicing part is arranged on the second terminal; the first terminal and the second terminal are respectively located at two ends of each single battery, after the adjacent single batteries are spliced through the first splicing part and the second splicing part, the first terminal of one single battery is welded with the second terminal of the other single battery, so that the electric connection between the single batteries is realized, the number of connecting structural members can be reduced, the grouped connection efficiency of the batteries is improved, the space utilization rate is improved, and the manufacturing cost of the batteries is reduced.

Description

Single battery and battery module

Technical Field

The utility model relates to a battery technology field especially relates to a battery cell and battery module.

Background

Batteries have become one of the key components of electric vehicles as the main power source of electric vehicles. The power battery terminal used by the electric automobile in the market is connected through connecting sheet welding, or fixedly connected through connecting sheet and bolt structure.

In the existing connection mode, the batteries are connected in a switching way by adopting a connecting sheet, the connecting sheet is not bent after being connected, the batteries are continuously arranged along the thickness direction, the connecting sheet is welded on the upper surface of the battery terminal, the depth direction of a molten pool is consistent with the thickness direction of the battery terminal, and the connecting sheet is used for connecting the terminals of the adjacent batteries. This kind of connected mode needs the design support simultaneously to the insulating properties between protection connection piece and the battery. The connecting structural members are large in number, more connecting sheets are needed, and the connecting efficiency of the battery module is low; the battery adopts the connection piece to carry out welded connection, needs the design support, and space utilization is lower.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a single cell reduces connection structure component quantity, improves the battery connection efficiency in groups, improves space utilization, reduces manufacturing cost.

To achieve the purpose, the utility model adopts the following technical proposal:

a battery cell comprising a first terminal and a second terminal, further comprising:

the first splicing part is arranged on the first terminal;

the second splicing part is used for splicing with the first splicing part, and the second splicing part is arranged on the second terminal;

the first terminal and the second terminal are respectively located at two ends of each single battery, and after the adjacent single batteries are spliced by the first splicing part and the second splicing part, the first terminal of one single battery is welded with the second terminal of the other single battery to realize the electric connection between the single batteries.

Preferably, the first splicing portion is provided with a slot, the second splicing portion is provided with a protrusion, the protrusion is used for being connected with the slot in an inserting mode, the protrusion is provided with a avoiding wall arranged outside the slot, the first splicing portion and the second splicing portion surround the avoiding wall to form a welding space, and the welding space is used for containing a welding pool formed during welding.

Preferably, the first splicing part is provided with a first splicing surface, the second splicing part is provided with a second splicing surface, and the second splicing surface is abutted to the first splicing surface.

Preferably, the number of the slots is two, the slots are symmetrically arranged on two sides of the first terminal, and the number of the protrusions is two.

Preferably, the first splicing part comprises a first mounting substrate and a first splicing block which are connected with each other, the first mounting substrate is fixedly connected to the first terminal, the slot is formed between the first mounting substrate and the first splicing block, the first splicing block is provided with a splicing inclined surface, and the splicing inclined surface is used for forming the inner wall of the slot and can enable the opening of the slot to contract from inside to outside.

Preferably, the first splicing blocks are provided with splicing planes, the splicing planes are connected with the splicing inclined planes, the splicing planes are parallel to the length direction of the single batteries, and the splicing planes can guide the protrusions to be inserted into the slots.

Preferably, the first terminal is provided with a first clamping groove, and the first splicing block is provided with a first clamping block matched with the first clamping groove in a clamping mode.

Preferably, the second splicing portion comprises a second mounting substrate and a second splicing block which are connected with each other, the second mounting substrate is fixedly connected to the second terminal, the protrusion is located on the second splicing block, the second terminal is provided with a second clamping groove, and the second splicing block is provided with a second clamping block which is clamped and matched with the second clamping groove.

Preferably, the surfaces of the first splicing part and the second splicing part are provided with assembling grooves, and the assembling grooves are used for accommodating the end faces of the first terminal and the second terminal.

In order to achieve the above object, the utility model also provides a battery module, including above-mentioned battery cell, first terminal with the second terminal is located battery cell length direction's both ends respectively, battery cell is provided with a plurality ofly, and is a plurality of battery cell arranges along length direction, and adjacent battery cell passes through first concatenation portion with after the concatenation of second concatenation portion, with one of them battery cell first terminal and another battery cell the second terminal welding to realize the electricity between the battery cell and be connected.

The utility model has the advantages that:

the utility model provides a single battery, concatenation through first concatenation portion and second concatenation portion for adjacent single battery connects, makes through welded connection to connect between the single battery electricity, and the mode that combines through concatenation and welding accomplishes adjacent single battery's fixed and electricity and connect, and the design of direct cancellation connection piece and support has saved the space for battery length direction, and same length battery module, the single battery who holds is more, has further promotion to battery module and battery package internal space utilization.

The utility model also provides a battery module, including foretell battery cell, battery cell is provided with a plurality ofly, and is a plurality of battery cell arranges along length direction, through the battery cell concatenation makes through welded connection and connects between the battery cell electricity. The batteries are spliced in a mode of being arranged in a square shape according to the length of the batteries, so that the arrangement design of the batteries in a module or a battery pack is more flexible, and the splicing quantity can be conveniently changed according to different design requirements; short single batteries are spliced and connected in series to form a long battery, so that the problem of low production and manufacturing qualified rate when the length of the single battery is too long is solved, the production and manufacturing qualified rate is improved, the production efficiency of the battery is improved, and the manufacturing cost is reduced; this scheme welds from the direction on perpendicular to battery surface when realizing battery welding in groups, welds from the side welding of battery terminal promptly, and the penetration direction of welding weld pool is unanimous with battery terminal width direction, and the bonding tool is in battery terminal side, and the bonding tool is different completely in the terminal surface top of battery terminal with traditional battery terminal welded connection piece time, and this scheme can promote welding production efficiency to improve battery production efficiency in groups.

Drawings

Fig. 1 is a schematic structural diagram of a single battery in the present invention;

fig. 2 is a cross-sectional view of a single battery in the present invention;

FIG. 3 is an enlarged partial schematic view at A in FIG. 2;

FIG. 4 is an exploded view of the first splice structure of the present invention;

FIG. 5 is an exploded view of another perspective of the present invention to embody the first splice structure;

FIG. 6 is a cross-sectional view of a first splice of the present invention;

fig. 7 is a cross-sectional view of a first terminal of the present invention;

FIG. 8 is an exploded view of the second splice structure of the present invention;

FIG. 9 is an exploded pictorial illustration of another perspective of the present invention to embody a second splice structure;

FIG. 10 is a cross-sectional view of a second splice of the present invention;

figure 11 is a cross-sectional view of a second terminal of the present invention;

fig. 12 is a schematic structural view of a battery module group according to the present invention;

fig. 13 is a partially enlarged schematic view at B in fig. 12.

In the figure:

1. a single battery; 11. a first cover plate; 111. a first mounting groove; 112. a first positioning concave ring; 12. a second cover plate; 121. a second mounting groove; 122. a second positioning concave ring; 2. a first terminal; 21. a first clamping groove; 22. a first boss; 23. a second boss; 3. a second terminal; 31. a second clamping groove; 32. a third boss; 33. a fourth boss; 4. a first splice; 41. a first mounting substrate; 411. a first positioning convex ring; 412. a first mounting groove; 413. a first through hole; 42. a first splice block; 421. inserting slots; 422. a first splicing surface; 423. splicing the inclined planes; 424. splicing planes; 425. a first clamping block; 426. a second through hole; 427. a third through hole; 5. a second splice; 51. a second mounting substrate; 511. a second positioning convex ring; 512. a second mounting groove; 513. a base plate; 5131. a fifth through hole; 514. a fourth via hole; 52. a second splice block; 521. a protrusion; 5211. a avoiding wall; 522. a second splicing surface; 523. a second clamping block; 524. a sixth via hole; 6. welding a space; 7. and assembling the groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the drawings.

As shown in fig. 1 and fig. 2, the present embodiment provides a single battery 1, which includes a first terminal 2 and a second terminal 3 respectively fixedly disposed at two ends of the single battery 1, wherein the first terminal 2 is provided with a first splicing portion 4, the second terminal 3 is provided with a second splicing portion 5, and the first splicing portion 4 and the second splicing portion 5 are welded after being spliced. When a plurality of battery cells 1 are connected in groups, a plurality of battery cells 1 are arranged, a first splicing part 4 of one battery cell 1 in two adjacent battery cells 1 is spliced with a second splicing part 5 of another battery cell 1, a first terminal 2 and a second terminal 3 are attached to each other and then welded, the adjacent battery cells 1 are electrically connected through welding connection, the number of connecting structural members can be reduced, the grouped connection efficiency of the battery cells is improved, the space utilization rate is improved, and the manufacturing cost is reduced.

The first terminal 2 and the second terminal 3 are disposed at two ends of the single battery 1, that is, the first terminal 2 and the second terminal 3 may be disposed at two ends of any one direction of the length direction, the width direction or the height direction of the single battery 1, specifically, the first terminal 2 and the second terminal 3 are disposed at two ends of the length direction of the single battery 1 oppositely in the embodiment. As shown in fig. 2, a first cover 11 is provided at one end of the unit battery 1 in the longitudinal direction, and the first terminal 2 is provided on the first cover 11. The first splice 4 includes a first mounting substrate 41 and a first splice block 42.

As shown in fig. 4 and 5, the first cover plate 11 is provided with a first mounting groove 111, a first positioning concave ring 112 is disposed in the first mounting groove 111, and a first positioning convex ring 411 is disposed on the first mounting substrate 41, so that the first mounting substrate 41 can be conveniently mounted on the first cover plate 11. The depth of the first mounting groove 111 is smaller than the thickness of the first mounting substrate 41, the first mounting substrate 41 protrudes from the surface of the first cover plate 11 when mounted in the first mounting groove 111, and the first positioning protrusion ring 411 is inserted into the first positioning recess ring 112. The first mounting substrate 41 is provided with a first through hole 413 through which the first terminal 2 passes.

Referring back to fig. 2 and 3, the first mounting substrate 41 is provided with a first mounting groove 412, the depth of the first mounting groove 412 is smaller than the thickness of the first splicing block 42, and the first splicing block 42 protrudes out of the surface of the first mounting substrate 41 after being mounted in the first mounting groove 412. A slot 421 is formed between the outer wall of the first splicing block 42 and the inner wall of the first mounting groove 412. The number of the slots 421 may be one or more, specifically, in this embodiment, two slots 421 are provided, and the two slots 421 are symmetrical to each other. The outer walls at the two ends of the first splicing block 42 in the length direction are abutted against the inner wall of the first mounting groove 412, and gaps are formed between the outer walls at the two sides of the first splicing block 42 in the width direction and the inner wall of the first mounting groove 412 to form a slot 421. The first mounting substrate 41 is a weak conductor, and is made of conductive polyphenylene sulfide (conductive PPS) in the present embodiment. The first splicing block 42 is a conductor, and is made of aluminum metal in this embodiment.

As shown in fig. 6, specifically, the outer wall of the first splicing block 42 located in the slot 421 may be a plane parallel to the length direction of the battery cell 1, and may also be set to be a splicing inclined plane 423, where the splicing inclined plane 423 is close to the bottom of the slot 421 and is inclined, that is, an inner wall of the slot 421 is formed, so that the opening of the slot 421 is contracted from inside to outside (refer to fig. 3), so that the slot 421 has a buckling force formed towards the direction close to the center of the first splicing block 42, and the assembling effect is better. The first splicing block 42 is further provided with a splicing plane 424 connected with the splicing inclined surface 423, and the splicing plane 424 is parallel to the length direction of the single batteries 1. The surface of the first splicing block 42 away from the first mounting plate is provided with a first splicing surface 422, and the first splicing surface 422 is perpendicular to the length direction of the single battery 1.

The first splicing block 42 is provided with a second through hole 426 and a third through hole 427 through which the first terminal 2 passes, the second through hole 426 is located on one side of the third through hole 427, which is close to the first mounting substrate 41, and the aperture of the second through hole 426 is larger than that of the third through hole 427.

As shown in fig. 7, a first boss 22 and a second boss 23 are disposed at the end of the corresponding first terminal 2, the first boss 22 is adapted to the second through hole 426, and the second boss 23 is adapted to the third through hole 427. The first terminal 2 is provided with a first clamping groove 21, the first splicing block 42 is provided with a first clamping block 425 clamped and matched with the first clamping groove 21, the first clamping groove 21 in the embodiment is located on the second boss 23 of the first terminal 2, and the first clamping groove 21 is annularly formed in the circumferential outer wall of the second boss 23. The first clamping block 425 is located in the third through hole 427 of the first splicing block 42, and is arranged on the inner wall of the third through hole 427 in an annular shape in a matching manner.

The single battery 1 is provided with a second cover plate 12 at an end remote from the first cover plate 11, and the second terminal 3 is provided on the second cover plate 12. The second splice 5 includes a second mounting substrate 51 and a second splice block 52. The first cover plate 11 and the second cover plate 12 are made of metal aluminum, and mainly play a role in welding with an aluminum shell and do not play a role in conducting electricity.

As shown in fig. 8 and 9, the second cover plate 12 is provided with a second mounting groove 121, a second positioning concave ring 122 is disposed in the second mounting groove 121, and a second positioning convex ring 511 is disposed on the second mounting base plate 51, so that the second mounting base plate 51 can be mounted on the second cover plate 12. The depth of the second mounting groove 121 is smaller than the thickness of the second mounting base plate 51, the second mounting base plate 51 is mounted in the second mounting groove 121 and protrudes out of the surface of the second cover plate 12, and the second positioning convex ring 511 is inserted into the second positioning concave ring 122. The second mounting substrate 51 is provided with a fourth through hole 514 through which the second end passes.

A second mounting groove 512 is formed in the second mounting substrate 51, the depth of the second mounting groove 512 is smaller than the thickness of the second splicing block 52, a backing plate 513 is disposed in the second mounting groove 512, and a fifth through hole 5131 for the second terminal 3 to pass through is disposed on the backing plate 513. When the second block 52 is mounted in the second mounting groove 512, the pad 513 is located between the second mounting groove 512 and the second block 52, and the surface of the second block 52 protrudes out of the surface of the second mounting substrate 51. The second mounting substrate 51 is an insulator, and is made of insulated polyphenylene sulfide (insulated PPS) in the present embodiment. The second block 52 and the pad 513 are both conductors, in this embodiment, the second block 52 is made of aluminum, and the pad 513 is made of copper.

The second splicing block 52 is provided with a protrusion 521, the protrusion 521 is used for being inserted into the slot 421, and after the insertion of the protrusion 521 and the slot 421 is completed, the protrusion 521 has a clearance wall 5211 arranged outside the slot. The protrusion 521 and the second splicing block 52 may be formed separately and then fixedly connected, or may be formed integrally. The number of the protrusions 521 is opposite to the number of the slots 421, and in this embodiment, two slots 421 are provided, so that two protrusions 521 are also provided. The surface of the second splicing block 52 away from the second mounting substrate 51 is provided with a second splicing surface 522, and the second splicing surface 522 is perpendicular to the length direction of the single battery 1 and is used for abutting against the first splicing surface 422. The surface that first concatenation piece 42 and second concatenation piece 52 are relative all seted up and has been put assembly groove 7, is used for holding the terminal surface of first terminal 2 and second terminal 3 respectively, and molten aluminum during the welding can flow into assembly groove 7, avoids protruding after first terminal 2 and the welding of second terminal 3 assembly gap department. When the first joint portion 4 and the second joint portion 5 are completely jointed, the first mounting substrate 41, the second mounting substrate 51 and the second joint block 52 enclose a welding space 6, and the avoiding wall 5211 of the protrusion 521 is in the welding space 6.

As shown in fig. 10 and 11, the second splicing block 52 is provided with a sixth through hole 524 for the second terminal 3 to pass through, the aperture of the fifth through hole 5131 is larger than that of the sixth through hole 524, a third boss 32 and a fourth boss 33 are arranged at the end of the opposite second terminal 3, the third boss 32 is adapted to the fifth through hole 5131, and the fourth boss 33 is adapted to the sixth through hole 524. The second terminal 3 is provided with the second joint groove 31, and the second splicing block 52 is provided with the second joint piece 523 that cooperates with the joint of the second joint groove 31, and the second joint groove 31 is located the fourth boss 33 of the second terminal 3 in this embodiment, and the second joint groove 31 is annularly opened on the circumference outer wall of the fourth boss 33. The second clamping block 523 is located in the sixth through hole 524 of the second splicing block 52, and is disposed on the inner wall of the sixth through hole 524 in an annular shape.

The operation of the battery unitizing connection structure of the present embodiment will be described as follows: when a plurality of battery cells 1 need to be connected in groups, arrange a plurality of battery cells 1 along length direction, connect through above-mentioned battery connection structure in groups, the concatenation of first concatenation portion 4 and second concatenation portion 5, protruding 521 inserts slot 421 along battery cell 1's length direction, concatenation plane 424 plays guiding direction guide effect to protruding 521's the inserting this moment, first concatenation face 422 and second concatenation face 522 butt, first mounting substrate 41, second mounting substrate 51 and second concatenation piece 52 enclose and close and form weld space 6, weld in weld space 6 department, the weld pool that weld space 6 formed when being used for the holding welding, make through welded connection and connect electrically between the battery cell 1. The welding mode is preferably laser welding, and the connecting structure is more reliable. The fixing and the electric connection of the adjacent single batteries 1 are completed in a splicing and welding combined mode, the design of a connecting sheet and a bracket is directly cancelled, the space in the length direction of the batteries is saved, and the utilization rate of the internal space of the battery module and the battery pack is further improved; the batteries are spliced in a mode of being arranged in a square shape according to the length of the batteries, so that the arrangement design of the batteries in a module or a battery pack is more flexible, and the splicing quantity can be changed conveniently according to different design requirements; this scheme welds from the direction on perpendicular to battery surface when realizing battery welding in groups, welds from the side of battery terminal promptly, and the weld depth direction of welding weld pool is unanimous with battery terminal width direction, and the bonding tool is in the battery terminal side, and the bonding tool is different completely in the terminal surface top of battery terminal when with traditional battery terminal welded connection piece, and this scheme can promote welding production efficiency to improve battery production efficiency in groups.

The embodiment of the utility model discloses a battery module is still included, as shown in fig. 12 and fig. 13, including a plurality of above-mentioned battery cells 1 of arranging along length direction, splice through first concatenation portion 4 and second concatenation portion 5, make through welded connection and connect electrically between the battery cell, with the mode that concatenation and welding combine in order to realize that the battery is in groups. The battery module of this embodiment adopts short battery cell 1 to splice and establish ties and form long battery, avoids the lower problem of manufacturing qualification rate when battery cell 1 length overlength, improves manufacturing qualification rate, improves the production efficiency of battery, reduces manufacturing cost. Compare explosion-proof valve design among the prior art on the top cap, explosion-proof valve orientation up or direction towards the horizontal direction in battery module or battery, the explosion-proof valve design in this scheme is on the casing, and explosion-proof valve is towards the top or the bottom of battery module or battery package. Specifically, explosion-proof valve is superior to towards the top towards battery module or battery package bottom, can directly excrete battery thermal runaway high temperature jet to module or battery package outside towards the bottom, and is safer.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery cell comprising a first terminal (2) and a second terminal (3), characterized by further comprising:

a first splice (4), the first splice (4) being disposed on the first terminal (2);

the second splicing part (5) is used for splicing with the first splicing part (4), and the second splicing part (5) is arranged on the second terminal (3);

the first terminal (2) and the second terminal (3) are respectively located at two ends of each single battery (1), and after the adjacent single batteries (1) are spliced through the first splicing part (4) and the second splicing part (5), the first terminal (2) of one single battery (1) and the second terminal (3) of the other single battery (1) are welded to achieve electric connection between the single batteries (1).

2. The single battery according to claim 1, wherein the first splicing portion (4) is provided with a slot (421), the second splicing portion (5) is provided with a protrusion (521), the protrusion (521) is used for being inserted into the slot (421), the protrusion (521) is provided with a avoiding wall (5211) arranged outside the slot (421), the first splicing portion (4) and the second splicing portion (5) are enclosed at the avoiding wall (5211) to form a welding space (6), and the welding space (6) is used for accommodating a welding pool formed during welding.

3. The cell according to claim 2, wherein the first splicing portion (4) is provided with a first splicing surface (422), and the second splicing portion (5) is provided with a second splicing surface (522), the second splicing surface (522) being configured to abut against the first splicing surface (422).

4. The battery cell according to claim 2, wherein the number of the insertion grooves (421) is two, the insertion grooves (421) are symmetrically arranged on two sides of the first terminal (2), and the number of the protrusions (521) is two.

5. The battery cell according to claim 2, wherein the first splicing portion (4) comprises a first mounting substrate (41) and a first splicing block (42) which are connected with each other, the first mounting substrate (41) is fixedly connected to the first terminal (2), the slot (421) is formed between the first mounting substrate (41) and the first splicing block (42), the first splicing block (42) is provided with a splicing inclined surface (423), and the splicing inclined surface (423) is used for forming an inner wall of the slot (421) and can enable an opening of the slot (421) to contract from inside to outside.

6. The battery cell according to claim 5, wherein the first splicing block (42) is provided with a splicing plane (424), the splicing plane (424) is connected with the splicing slope (423), and the splicing plane (424) can guide a protrusion (521) to be inserted into the insertion groove (421).

7. The battery cell according to claim 5, wherein the first terminal (2) is provided with a first clamping groove (21), and the first splicing block (42) is provided with a first clamping block (425) which is in clamping fit with the first clamping groove (21).

8. The battery cell according to claim 2, wherein the second joint part (5) comprises a second mounting substrate (51) and a second joint block (52) which are connected with each other, the second mounting substrate (51) is fixedly connected to the second terminal (3), the protrusion (521) is located on the second joint block (52), the second terminal (3) is provided with a second clamping groove (31), and the second joint block (52) is provided with a second clamping block (523) which is in clamping fit with the second clamping groove (31).

9. The single battery according to claim 1, wherein the first splicing portion (4) and the second splicing portion (5) are provided with assembling grooves (7) on the surfaces, and the assembling grooves (7) are used for accommodating the end faces of the first terminal (2) and the second terminal (3).

10. A battery module, characterized in that, includes the battery cell of any one of claims 1-9, first terminal (2) and second terminal (3) are located battery cell (1) length direction's both ends respectively, battery cell (1) is provided with a plurality ofly, and is a plurality of battery cell (1) arranges along length direction, and adjacent battery cell (1) passes through after first concatenation portion (4) and second concatenation portion (5) splice, with the first terminal (2) of one of them battery cell (1) with the second terminal (3) welding of another battery cell (1) to realize the electric connection between battery cell (1).