CN218242009U - Battery cell, battery pack and vehicle - Google Patents

Abstract

The utility model discloses an electric core, a battery pack and a vehicle, wherein the electric core comprises a pole core, a pole lug piece, a packaging film and a first bonding piece, and the pole lug piece is connected with the pole core; the packaging film comprises a film main body and a turned edge, the film main body wraps the pole core, and the turned edge is arranged on at least one side of the film main body in the width direction; the first bonding piece fixedly connects the flanging edge with the film main body, and the first bonding piece does not completely cover the outer side surface of the packaging film along the width direction. According to the utility model discloses electric core, the space that first bonding piece in this electric core occupy electric core side is smaller, can make things convenient for electric core and structural adhesive to improve the stability behind the electric core installation.

Description

Battery cell, battery pack and vehicle

Technical Field

The utility model relates to a battery technology field, in particular to battery cell, battery package that has this battery cell and the vehicle that has this battery package.

Background

At present, laminate polymer battery core has become HEV battery's important development direction gradually, and electric core generally adopts the plastic-aluminum membrane to encapsulate, need advance line location to turning over the hem among the packaging process, and the location structure that the correlation technique was turned over the hem has adverse effect to the fixed strength of electric core, leads to the fixed strength of electric core not enough, influences the stability of battery package.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric core, the first bonding piece in this electric core does not cover the lateral surface of electric core completely, can glue direct bonding with the structure in the battery package shell when electric core is installed to the battery package shell like this to improve the stability after the electric core installation.

Another object of the present invention is to provide a battery pack, which includes the above-mentioned battery cell.

A further object of the present invention is to provide a vehicle, which includes the battery pack.

The battery cell comprises a pole core, a pole lug piece, a packaging film and a first bonding piece, wherein the pole lug piece is connected with the pole core; the packaging film comprises a film main body and a turned edge, the film main body wraps the pole core, and the turned edge is arranged on at least one side of the film main body in the width direction; the first bonding piece fixedly connects the flanging edge with the film main body, and the first bonding piece does not completely cover the outer side surface of the packaging film along the width direction.

According to the utility model discloses electric core, the first bonding piece in this electric core does not cover the lateral surface of electric core completely, can glue direct bonding with the structure in the battery package shell when electric core is installed to the battery package shell like this to improve the stability after the electric core installation.

In addition, according to the utility model discloses above-mentioned embodiment's electric core can also have following additional technical characterstic:

optionally, the first bonding member includes a first bonding section and a second bonding section that are connected to each other, the first bonding section is bonded to the outer side of the flap, and the second bonding section is bonded to one side surface of the film main body in the thickness direction.

Optionally, a dimension of the first bonding section in a thickness direction of the battery cell is H1, a thickness dimension of the battery cell is H, and H1 and H satisfy: H1/H is more than or equal to 1/3 and less than or equal to 1/2.

Optionally, a dimension of the second bonding section in the width direction of the battery cell is W1, a dimension of the first bonding section in the thickness direction of the battery cell is H1, and W1 and H1 satisfy: W1/H1 is more than or equal to 2 and less than or equal to 3.

Optionally, the length of the battery cell is L, and L is greater than or equal to 260mm and less than or equal to 1000mm.

Optionally, the width dimension of the battery cell is W, and W/L is more than or equal to 10% and less than or equal to 40%.

Optionally, the thickness of the battery cell is H, and H/L is more than or equal to 1% and less than or equal to 5%.

Optionally, tab glue is arranged on the tab pieces, and the length dimension of the tab glue exposed out of the packaging film is greater than or equal to 0.2mm and less than or equal to 3 mm.

Optionally, the pole tab has a thickness dimension of 0.15 millimeters or greater and 0.5 millimeters or less.

Optionally, the width dimension of the pole tab is greater than or equal to 30% and less than or equal to 70% of the width dimension of the battery.

Optionally, portions of the encapsulation film on opposite sides of the pole tab have a cut-out structure.

Optionally, the encapsulation film has a first punched pit and a second punched pit thereon, the first punched pit and the second punched pit cooperating to wrap the pole core.

Optionally, the battery cell further includes a second bonding member, the second bonding member includes a first connection segment, a second connection segment, and a third connection segment that are connected to each other, the first connection segment and the second connection segment are respectively bonded to two side surfaces of the pole core that are opposite to each other in the thickness direction, and the third connection segment is connected between the first connection segment and the second connection segment.

Optionally, the first adhesive member and the second adhesive member are tapes.

Optionally, at least one of the first connection segment and the second connection segment has a dimension W3 in a width direction of the battery cell, the thickness dimension of the battery cell is H, and W3 and H satisfy: W3/H is more than or equal to 1 and less than or equal to 3.

Optionally, a plurality of second bonding pieces are arranged on two opposite sides of the pole core in the width direction, the second bonding pieces are arranged at intervals in the length direction of the battery core, and the distance between every two adjacent second bonding pieces is greater than or equal to 50 millimeters and less than or equal to 80 millimeters in the length direction of the battery core.

According to the utility model discloses another purpose's battery package, including shell, structure glue and according to aforementioned electric core, electric core with the structure is glued and is located in the shell, just in the lateral surface of packaging film along width direction not by the part that first bonding piece covered passes through the structure is glued and is fixed in the shell.

According to a further object of the present invention, a vehicle comprises a battery pack according to the above.

According to the utility model discloses electric core, battery package and vehicle, the first bonding piece in this electric core does not cover the lateral surface of electric core completely, can glue direct bonding with the structure in the battery package shell when electric core is installed to the battery package shell like this to improve the stability after the electric core installation. And further, stable power can be provided for the vehicle, and stable running of the vehicle is maintained.

Drawings

Fig. 1 is a schematic diagram of a battery cell according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of the area circled a in fig. 1.

Fig. 3 is an exploded view of a battery cell according to an embodiment of the present invention.

Fig. 4 is a partial schematic view of fig. 3.

Fig. 5 is a schematic diagram of a battery cell according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a cell before being packaged according to an embodiment of the present invention.

Fig. 7 is a schematic view of another direction before the cell is packaged according to an embodiment of the present invention.

Fig. 8 is a schematic view of an encapsulation film of a battery cell according to an embodiment of the present invention.

Fig. 9 is a schematic view of the pole piece of the battery cell according to an embodiment of the present invention and the second bonding member.

Fig. 10 is a schematic view of the pole piece of the battery cell according to an embodiment of the present invention cooperating with the second bonding member.

Fig. 11 is a schematic diagram of a second bonding member of a battery cell according to an embodiment of the present invention.

Reference numerals:

the battery comprises a battery core 100, a pole core 10, a pole lug sheet 20, an encapsulation film 30, a film main body 31, a flanging edge 32, a first punching pit 301, a second punching pit 302, a corner cutting structure 303, a first bonding piece 40, a first bonding section 41, a second bonding section 42, a second bonding piece 50, a first connecting section 51, a second connecting section 52 and a third connecting section 53.

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 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 drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 to 9, a battery cell 100 according to an embodiment of the present invention includes a pole core 10, a tab sheet 20, an encapsulation film 30, and a first bonding member 40. In the packaging process of the battery cell 100, the packaging film 30 wraps the pole piece 10, an edge seal is formed after the packaging film 30 wraps the pole piece 10, and then the edge seal is subjected to edge folding to form an edge folding edge 32, so as to reduce the width size of the battery cell 100.

Specifically, the tab piece 20 is connected to the pole core 10 for connection to an external circuit. The encapsulation film 30 includes a film main body 31 and a folded edge 32, the film main body 31 wraps the pole piece 10, and the folded edge 32 is provided on at least one side of the film main body 31 in the width direction. The first adhesive member 40 fixedly couples the flap 32 and the film main body 31 to position the flap 32, and the first adhesive member 40 does not completely cover the outer side surface of the encapsulation film 30 in the width direction. Alternatively, the first adhesive member 40 covers at most a part of the outer side surface of the sealing film 30 in the width direction; in other words, the orthogonal projection of the sealing film 30 coincides with the orthogonal projection of the first adhesive member 40 in the width direction of the sealing film 30.

According to the utility model discloses electric core 100, the first bonding piece in this electric core does not cover the lateral surface of electric core completely, and when electric core was installed to the battery package shell in, direct bonding can be glued with the structure in the battery package shell like this to improve the stability after the electric core installation.

The specific material of the sealing film 30 is not particularly limited in the present invention. For example, in some embodiments, the encapsulation film 30 may be an aluminum plastic film, and the cell is a soft-packed cell. Of course, in other implementations, the encapsulation film may also be a PP film.

Referring to fig. 1, if there is no special description, the length direction of the present invention may refer to the front-back direction in the drawings, the width direction may refer to the left-right direction in the drawings, and the thickness direction may refer to the up-down direction in the drawings. Herein, unless otherwise specified, in the present invention, the surface refers to a surface opposite to a surface in a thickness direction, for example, the surface of the battery cell 100 refers to a surface opposite to the surface of the battery cell 100 in the thickness direction, that is, an upper surface and a lower surface of the battery cell 100 in the drawings; for another example, the surface of the pole core 10 refers to the surface of the pole core 10 that is opposite to the surface in the thickness direction, i.e., the upper surface and the lower surface of the pole core 10 in the drawings. In addition, the side surfaces refer to the surfaces that are opposite in the width direction, for example, the side surfaces of the battery cell 100 refer to the surfaces that are opposite in the width direction on the battery cell 100, that is, the left and right surfaces of the battery cell 100 in the drawing; for another example, the side surfaces of the encapsulation film 30 refer to the surfaces of the encapsulation film 30 that are opposed to each other in the width direction, i.e., the left and right surfaces of the encapsulation film 30 in the drawing.

In this case, the flap 32 may be folded on the side of the film main body 31, and a portion of the first adhesive member 40 may be adhered to the flap 32 (at a position opposite to the side of the film main body 31) and another portion may be adhered to the surface (or side) of the film main body 31. In addition, during the cell packaging process, at least one side of the film main body 31 opposite to the width direction is provided with a flanging edge 32. For example, the left side of the film main body 31 is provided with a flap 32, the flap 32 is connected to the film main body 31 by a first adhesive 40, and the first adhesive 40 for fixing the flap 32 does not completely cover the left side of the encapsulation film 30, that is, the first adhesive 40 for fixing the flap 32 covers at most a portion of the left side of the encapsulation film 30; for another example, the right side of the film main body 31 is provided with a flap 32, the flap 32 is connected to the film main body 31 by a first adhesive 40, and the first adhesive 40 for fixing the flap 32 does not completely cover the right side of the sealing film 30, that is, the first adhesive 40 for fixing the flap 32 covers at most a portion of the right side of the sealing film 30.

As shown in fig. 2 and 4, in some embodiments of the present invention, the first bonding member 40 includes a first bonding section 41 and a second bonding section 42 connected to each other, the first bonding section 41 is bonded to the outside of the folded edge 32, and the second bonding section 42 is bonded to one side surface of the film main body 31 in the thickness direction. The flanged edge 32 may be stably fixed by the first adhesive member 40, which improves the stability of the battery cell 100. In addition, the packaging film 30 of the present invention may be an aluminum-plastic film or other films for packaging the battery cell 100, and the bonding member may be an adhesive tape.

In the present invention, the tab pieces 20 may include at least two, for example, two tab pieces 20 are provided to construct a positive tab and a negative tab. Of course, the battery cell 100 of the present invention may also include other numbers of tab pieces 20, such as one, three, four, etc.

As shown in fig. 2 and 4, the dimension of the first adhesive segment 41 in the thickness direction of the battery cell 100 is H1, and the thickness dimension of the battery cell 100 is H, where H1 and H satisfy: H1/H is more than or equal to 1/3 and less than or equal to 1/2. The side edge of the bonding piece and the packaging film 30 can be bonded in a sufficient area, and the purpose of fixing the turned edge 32 is achieved; meanwhile, the bonding piece can be prevented from covering the side face of the battery too long, and half of the thickness dimension needs to be reserved to expose the packaging film 30, so that the packaging film 30 is bonded with the structural adhesive in the battery pack, and the fixing strength of the battery in the battery pack is improved. For example, the ratio H1/H can be 0.4, 0.45, and the like.

As shown in fig. 4, the dimension of the second adhesive segment 42 in the width direction of the battery cell 100 is W1, the dimension of the first adhesive segment 41 in the thickness direction of the battery cell 100 is H1, and W1 and H1 satisfy: W1/H1 is more than or equal to 2 and less than or equal to 3. The second adhesive section 42 can be firmly adhered to the packaging film 30, and the folded edge 32 of the packaging film 30 can be fixed. For example, the ratio W1/H1 can be 2.3, 2.7, etc.

As shown in fig. 5, in some embodiments of the present invention, the length dimension of the battery cell 100 is L, and L is greater than or equal to 260mm and less than or equal to 1000mm. For example, the length dimension L of the battery cell 100 may be 280 mm, 520 mm, and the like. As shown in fig. 5, the width dimension of the battery cell 100 is W, and the length dimension of the battery cell 100 is L, where W and L satisfy, and W/L is greater than or equal to 10% and less than or equal to 40%. For example, the ratio W/L may be 15%, 25%, etc. With reference to fig. 4 and 5, optionally, the thickness dimension of the battery cell 100 is H, and the length dimension of the battery cell 100 is L, where H and L satisfy 1% H/L ≦ 5%. Wherein, the ratio H/L can be 1.5%, 2.5% and the like. Through the setting to electric core 100 size, can satisfy large capacity battery demand and heat dissipation safety demand.

The utility model provides an electricity core 100 can set up utmost point ear glue on the utmost point ear piece 20 in the packaging process, glues through utmost point ear and glues packaging film 30 and the fixed encapsulation of utmost point ear piece 20, and wherein, utmost point ear glue can adopt the grey glue or the utmost point ear glue of easily CCD discernment, and the utmost point ear piece 20 that can guarantee to use the utmost point ear piece of CCD discernment of being convenient for exposes packaging film 30. Alternatively, the length of the tab paste exposed out of the encapsulation film 30 may be set to 0.2mm or more and 3mm or less. The lower limit value of 0.2mm of the exposed size of the tab piece 20 can be controlled to ensure that the packaging film 30 has no low-pressure corrosion risk, and the upper limit value of 3mm can be controlled to prevent the tab glue from occupying too much space. For example, the length of the tab paste exposed out of the encapsulation film 30 may be 0.3 mm, 1.5 mm, 2.4 mm, etc. The length of the tab glue exposed packaging film 30 refers to the dimension of the tab glue exposed packaging film part in the length direction of the battery cell.

Optionally, the thickness dimension of the tab piece 20 is equal to or greater than 0.15mm and equal to or less than 0.5mm. It is understood that the thickness dimension of the tab piece 20 refers to the dimension of the tab piece 20 in the thickness direction of the battery cell. The thickness of the tab piece 20 may be 0.3 mm, 0.35 mm, 0.48 mm, etc. In order to meet the demand of the overcurrent capacity of the tab 20, the lower limit of the degree size of the tab 20 is designed to be 0.15mm or more. Meanwhile, the upper limit of the thickness dimension of the tab piece 20 is designed to be 0.5mm or less, considering that the sealing of the encapsulation film at the tab piece 20 is not facilitated when the thickness dimension of the tab piece 20 is too large. Alternatively, as shown in fig. 5, the width dimension W2 of the tab piece 20 is 30% to 70% of the width dimension W of the battery cell 100. It is understood that the width dimension of the tab piece 20 refers to the dimension of the tab piece 20 in the width direction of the battery cell. Due to the size limitation of the width W2 of the antipodal lug 20, the influence of an excessively small width on the overcurrent capacity of the battery cell 100 can be avoided, and the influence of an excessively large width on the cutting angle of the encapsulation film 30 can also be avoided. The width W2 of the tab piece 20 may be 55% or 64% of the width W of the battery cell 100.

The utility model discloses a battery cell 100 can include a plurality of utmost point auricles 20, for example battery cell 100 can include positive plate and negative plate, and wherein, the positive plate material can be A1N30, AL1050 or AL1060, and the material of negative plate can be Cu1020, can also carry out nickel plating on the negative plate, and nickel layer thickness size can be in 0.5um-1.5 um's within range.

As shown in fig. 2, in some embodiments of the present invention, both sides of the encapsulation film 30 located on the pole tab sheet 20 in the width direction of the battery cell 100 have a cut-out structure 303. The packaging film 30 is cut into corners, so that the assembly can be prevented from being influenced by bending of four corners of the packaging film 30; the hem is carried out after cutting the angle, can prevent the hem bounce-back, and wherein the hem can use the bonding piece to retrain, perhaps uses glue to bond the restraint.

The corner cutting structure 303 of the encapsulation film 30 is to cut off a portion of the encapsulation film 30 on two opposite sides of the pole tab 20, and may be similar to chamfering or rounding.

As shown in fig. 6-8, in some embodiments of the present invention, the encapsulation film 30 has a first punched pit 301 and a second punched pit 302 thereon, the first punched pit 301 and the second punched pit 302 cooperate to wrap the pole core 10, and the first punched pit 301 and the second punched pit 302 have the same size and depth. The packaging film 30 adopts a double-pit structure, the size and the depth of the pits are the same, and the pole core 10 is placed in the pits for heat sealing. The stability of the battery cell 100 can be improved, and the efficiency and the effect of encapsulation can be improved. In addition, the utility model discloses in can carry out the heat-seal after encapsulating film 30 parcel utmost point core 10 to cut out angle and hem etc. after the heat-seal is accomplished.

As shown in fig. 6 to 11, in some embodiments of the present invention, the battery cell 100 further includes a second adhesive member 50, and the second adhesive member 50 is used to connect the pole piece 10, so as to prevent the pole piece 10 from being scattered during the assembly process.

Referring to fig. 9 to 11, the second adhesive member 50 includes a first connecting section 51, a second connecting section 52, and a third connecting section 53 connected to each other, the first connecting section 51 and the second connecting section 52 are respectively adhered to two opposite side surfaces of the pole core 10 in the thickness direction, and the third connecting section 53 is connected to the first connecting section 51 and the second connecting section 52. The pole core 10 is bonded by a C-shaped adhesive tape, the pole core 10 and the pole lug sheet 20 are subjected to ultrasonic welding or laser welding, and after welding, a welding spot needs to be protected by adhering the adhesive tape, so that the welding spot and the cut edge of the pole lug are prevented from contacting with the packaging film 30, and the packaging film 30 is prevented from being corroded.

In addition, the first adhesive member 40 of the present invention may be an adhesive tape, and the second adhesive member 50 may also be an adhesive tape.

Alternatively, with reference to fig. 9 to 11, at least one of the first connecting section 51 and the second connecting section 52 has a dimension W3 in the width direction of the battery cell 100, the thickness dimension of the battery cell 100 is H, and W3 and H satisfy: W3/H is more than or equal to 1 and less than or equal to 3. The dimension of the second adhesive member 50 on the surface of the pole core 10 is 1 to 3 times of the thickness dimension of the pole core 10, and this arrangement can make the adhesive member firmly adhere to the encapsulation film 30, and prevent the scattering during the assembly of the battery cell 100. Wherein, the ratio W3/H can be set to 1.5, 2.4, etc.

Optionally, as shown in fig. 9, a plurality of second bonding pieces 50 are disposed on two opposite sides of the pole core 10 in the width direction, and the second bonding pieces 50 are arranged at intervals along the length direction of the pole core 10, and in the length direction of the battery cell, a gap K between two adjacent second bonding pieces is greater than or equal to 50 mm and less than or equal to 80 mm. Not only can prevent that electric core 100 from scattering, can also prevent that encapsulation film 30 is originated and the limit perk of ending, get into encapsulation film 30 seal. Wherein, the spacing K may be 55 mm, 64 mm, 76 mm, etc.

According to another object of the present invention, a battery pack includes the battery cell 100 according to the above. Specifically, the battery pack includes a case, a structural adhesive, and a battery core, the battery core and the structural adhesive are disposed in the case, and a portion of the outer side surface of the encapsulation film 30 in the width direction, which is not covered by the first adhesive member 40, is fixed to the case by the structural adhesive.

Through setting up aforementioned electric core 100, with the incomplete cladding electric core 100's of first bonding piece 40 side, can make electric core 100 contact structure glue more easily, guaranteed electric core 100's location intensity to improve the performance of battery package, avoid electric core 100 to shift the contact failure scheduling problem that leads to.

According to the utility model discloses vehicle of still another purpose, include according to aforementioned battery package. The power supply device can provide stable power for the vehicle and maintain the stable running of the vehicle.

Certainly, the battery package in the utility model provides a can also be used to in other equipment.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present 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 explicitly defined otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; 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 of ordinary skill 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 "under," "beneath," and "under" a second feature may be directly under or obliquely under the second 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. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

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. A battery cell, comprising:

a pole core (10);

a pole tab (20), the pole tab (20) being connected to the pole core (10);

the packaging film (30) comprises a film main body (31) and a turned edge (32), the film main body (31) wraps the pole core (10), and the turned edge (32) is arranged on at least one side of the film main body (31) in the width direction;

the first adhesive piece (40) is used for fixedly connecting the flanging edge (32) with the film main body (31), and the outer side face of the packaging film (30) along the width direction is not completely covered by the first adhesive piece (40).

2. The battery cell of claim 1, wherein the first bonding member (40) comprises a first bonding section (41) and a second bonding section (42) which are connected with each other, the first bonding section (41) is bonded to the outer side of the flanging (32), and the second bonding section (42) is bonded to one side surface of the film main body (31) in the thickness direction.

3. The electric core of claim 2, wherein the first bonding segment (41) has a dimension H1 in a thickness direction of the electric core, the electric core has a thickness dimension H, and H1 and H satisfy: H1/H is more than or equal to 1/3 and less than or equal to 1/2.

4. The battery cell of claim 2, wherein the second adhesive segment (42) has a dimension W1 in a width direction of the battery cell, the first adhesive segment (41) has a dimension H1 in a thickness direction of the battery cell, and W1 and H1 satisfy: W1/H1 is more than or equal to 2 and less than or equal to 3.

5. The cell of any of claims 1-4, wherein the cell has a length dimension L, L ≦ 260mm ≦ 1000mm;

and/or the width dimension of the battery cell is W, and W/L is more than or equal to 10% and less than or equal to 40%;

and/or the thickness dimension of the battery cell is H, wherein H/L is more than or equal to 1% and less than or equal to 5%;

and/or a tab glue is arranged on the tab piece (20), and the length dimension of the tab glue exposed out of the packaging film (30) is more than or equal to 0.2mm and less than or equal to 3 mm;

and/or the thickness dimension of the pole tab (20) is greater than or equal to 0.15mm and less than or equal to 0.5 mm;

and/or the width dimension of the pole tab (20) is greater than or equal to 30% and less than or equal to 70% of the width dimension of the battery.

6. The electrical core of any of claims 1 to 4, wherein portions of the encapsulation film (30) on opposite sides of the pole tab (20) have a cut-out structure (303);

and/or the encapsulation film (30) is provided with a first punching pit (301) and a second punching pit (302), and the first punching pit (301) and the second punching pit (302) are matched to wrap the pole core (10).

7. The cell of any of claims 1-4, further comprising:

the second bonding piece (50) comprises a first connecting section (51), a second connecting section (52) and a third connecting section (53), the first connecting section (51) and the second connecting section (52) are connected with each other, the first connecting section (51) and the second connecting section (52) are respectively bonded to two opposite side surfaces of the pole core (10) along the thickness direction, and the third connecting section (53) is connected between the first connecting section (51) and the second connecting section (52);

and/or the first adhesive member (40) and the second adhesive member (50) are adhesive tapes.

8. The electric core of claim 7, wherein at least one of the first connecting section (51) and the second connecting section (52) has a dimension W3 in a width direction of the electric core, the electric core has a thickness dimension H, and W3 and H satisfy: W3/H is more than or equal to 1 and less than or equal to 3;

and/or a plurality of second bonding pieces (50) are arranged on two opposite sides of the pole core (10) in the width direction, the second bonding pieces (50) are arranged at intervals along the length direction of the battery cell, and the distance between every two adjacent second bonding pieces is greater than or equal to 50 millimeters and smaller than or equal to 80 millimeters along the length direction of the battery cell.

9. A battery pack comprising a casing, a structural adhesive, and the electric core according to any one of claims 1 to 8, wherein the electric core and the structural adhesive are provided in the casing, and a portion of an outer side surface of the encapsulation film (30) in the width direction, which is not covered with the first adhesive member (40), is fixed to the casing by the structural adhesive.

10. A vehicle characterized by comprising the battery pack according to claim 9.

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