CN214254551U - Battery unit and terminal device - Google Patents

Abstract

The present disclosure provides a battery unit and a terminal device. The battery unit includes a plurality of batteries; each battery comprises a battery cell body and a packaging bag, wherein the packaging bag comprises a main body part, a first side sealing part and a second side sealing part, the battery cell body is accommodated in the main body part, and the first side sealing part and the second side sealing part are respectively positioned on two sides of the main body part along the transverse direction of the battery cell body; the plurality of batteries includes at least a first battery and a second battery. The first side seal of the first cell is disposed adjacent to the second side seal of the second cell. The distance D between the first end face of the first side seal part of the first battery and the second end face of the second side seal part of the second battery satisfies the following conditions: d is more than or equal to 0.2mm and less than or equal to 4mm, so that the first end face and the second end face are prevented from being contacted, and the possibility of electrochemical corrosion caused by the contact between the end faces of the edge sealing structures of the adjacent batteries can be reduced or even avoided.

Description

Battery unit and terminal device

Technical Field

The present disclosure relates to the field of power batteries, and in particular, to a battery unit and a terminal device.

Background

At present, with the vigorous development of electronic products, the requirements on the capacity, the quick charge, the cost and the safety of a power battery are higher and higher, and the application requirement of multi-string and multi-parallel is further promoted. At present, the soft package battery mainly adopts a packaging bag to package the battery core, and after packaging and trimming, the end face of the edge sealing structure at the edge of the battery has a conductive part. Contact between the end faces of the edge seals of adjacent cells may cause galvanic corrosion of the contact between the edge seals.

SUMMERY OF THE UTILITY MODEL

In view of the shortcomings of the prior art, it is an object of the present disclosure to provide a battery unit and a terminal device, which can reduce or even avoid the possibility of electrochemical corrosion due to contact between the end faces of the edge sealing structures of adjacent batteries.

To achieve the above object, in one aspect, the present disclosure provides a battery unit including a plurality of batteries; each battery comprises a battery cell body and a packaging bag, wherein the packaging bag comprises a main body part, a first side sealing part and a second side sealing part, the battery cell body is accommodated in the main body part, and the first side sealing part and the second side sealing part are respectively positioned on two sides of the main body part along the transverse direction of the battery cell body; the plurality of batteries includes at least a first battery and a second battery. The first side seal of the first cell is disposed adjacent to the second side seal of the second cell. The distance D between the first end face of the first side seal part of the first battery and the second end face of the second side seal part of the second battery satisfies the following conditions: d is more than or equal to 0.2mm and less than or equal to 4 mm.

In an embodiment, a distance D between the first end surface of the first side seal of the first battery and the second end surface of the second side seal of the second battery in the thickness direction of the battery cell body satisfies: d is more than or equal to 0.2mm and less than or equal to 4 mm.

In an embodiment, the second side seal of the second cell extends in a thickness direction of the cell body, the first side seal of the first cell extends in the thickness direction of the cell body, and the second end face of the second side seal of the second cell is higher than the first end face of the first side seal of the first cell in the thickness direction.

In one embodiment, a distance D in the thickness direction between the second end face of the second side seal of the second cell and the first end face of the first side seal of the first cell is not less than 1/3 of a dimension of the first side seal in the thickness direction.

In an embodiment, the number of the large faces of each cell is two, the two large faces are arranged in an opposite manner along the thickness direction, and the second end face of the second side sealing part is located between the two large faces.

In an embodiment, a distance D between the first end face of the first side seal of the first battery and the second end face of the second side seal of the second battery in the transverse direction of the cell body satisfies: d is more than or equal to 0.2mm and less than or equal to 4 mm.

In an embodiment, the first side sealing portion of the first battery extends along the thickness direction, the second side sealing portion of the second battery includes a first portion, a bending portion and a second portion, the first portion extends along the thickness direction, the bending portion connects the first portion and the second portion, and the second portion is located between the first portion and the main body portion.

In an embodiment, the number of the large surfaces of each battery is two, the two large surfaces are arranged in an opposite manner along the thickness direction, and the top surface of the bent portion of the second side sealing portion is located between the two large surfaces.

In one embodiment, the second portion of the second side sealing part of each battery is adhered to the side surface of the main body part.

In order to achieve the above object, in another aspect, the present disclosure provides a terminal device including the foregoing battery cell.

The beneficial effects of this disclosure are as follows:

in the battery unit according to the present disclosure, by spacing a distance D between a first end surface of a first side seal of a first battery and a second end surface of a second side seal of a second battery, which are adjacently disposed, the distance D satisfies: d is more than or equal to 0.2mm and less than or equal to 4mm, so that the first end face and the second end face are prevented from being contacted, and the possibility of electrochemical corrosion caused by the contact between the end faces of the edge sealing structures of the adjacent batteries can be reduced or even avoided.

Drawings

Fig. 1 is a schematic diagram of an embodiment of a terminal device according to the present disclosure.

Fig. 2 is a schematic diagram of a battery cell according to the present disclosure prior to battery formation.

Fig. 3 is another schematic diagram of a battery cell according to the present disclosure prior to battery formation.

Fig. 4 is yet another schematic diagram of a battery cell according to the present disclosure prior to battery formation.

Fig. 5 is a perspective view of an embodiment of a battery cell according to the present disclosure.

Fig. 6 is a plan view of the battery of fig. 5.

Fig. 7 is an enlarged view of circle a in fig. 6.

Fig. 8 is an enlarged view of circle B in fig. 6.

Fig. 9 is a perspective view of an embodiment of a battery cell according to the present disclosure.

Fig. 10 is a plan view of the battery cell of fig. 9.

Fig. 11 is an enlarged view of a circled portion in fig. 10.

Fig. 12 is a perspective view of another embodiment of a battery cell according to the present disclosure.

Fig. 13 is a plan view of the battery of fig. 12.

Fig. 14 is an enlarged view of circle C in fig. 13.

Fig. 15 is an enlarged view of circle D in fig. 13.

Fig. 16 is a perspective view of another embodiment of a battery cell according to the present disclosure.

Fig. 17 is a plan view of the battery cell of fig. 16.

Fig. 18 is a schematic diagram of yet another embodiment of a battery cell according to the present disclosure.

Fig. 19 is an enlarged view of a circled portion in fig. 18.

Fig. 20 is a schematic diagram of yet another embodiment of a battery cell according to the present disclosure.

Fig. 21 is an enlarged view of a circled portion in fig. 20.

Wherein the reference numerals are as follows:

200 notebook computer 212 side

100 first side seal of cell 22

100A first cell 22a first end face

100B second battery 23 second side seal

1 cell body 23a second end face

2 first part of the packaging bag 231

2a first packaging film 232 bent portion

S1 second part of first lumen 233

2b second packaging film 3 pole ear

S2 transverse direction of second inner cavity X battery cell body

21 longitudinal direction of Y cell body of main body part

Thickness direction of 211 large-surface Z-shaped battery cell body

Detailed Description

The accompanying drawings illustrate embodiments of the present disclosure and it is to be understood that the disclosed embodiments are merely examples of the disclosure, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure.

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure; the terms "including" and "having," and any variations thereof, in the description and claims of this disclosure and the description of the above figures are intended to cover non-exclusive inclusions. In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and the like in the description and claims of the present disclosure or in the above-described drawings are used for distinguishing between different objects, and are not intended to describe a particular order or primary-secondary relationship, nor are they to be construed as indicating or implying relative importance. The terms "connected" and "coupled" are used broadly and include, for example, "connected" and "coupled" as well as both fixed and removable or integral or electrical or signal connections; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The presence of "a plurality" in this disclosure means more than two (including two).

The present disclosure is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

The embodiment of the present disclosure describes that the battery unit is suitable for various terminal devices using the battery unit, for example, a mobile phone, a portable device, an intelligent wearable device, a notebook computer, a battery car, an electric automobile, a ship, a spacecraft, an electric toy, an electric tool, and the like. The battery unit provides power for the terminal equipment. The battery unit described in the embodiments of the present disclosure is not limited to be applied to the terminal device described above, but may be applied to all terminal devices using the battery unit. For example, fig. 1 shows a structure of a notebook computer 200, a battery unit is disposed inside the notebook computer 200, and the battery unit may include a plurality of batteries, and the battery unit provides power for the notebook computer 200 to meet a power demand when the notebook computer 200 is used.

Referring to fig. 2 to 21, the battery unit of the present disclosure includes a plurality of batteries 100. Each battery 100 includes a cell body 1 and a packaging bag 2. The package 2 includes a main body 21, a first side seal 22 and a second side seal 23. The cell body 1 is accommodated in the main body portion 21, and the first side seal portion 22 and the second side seal portion 23 are respectively located on two sides of the main body portion 21 along the transverse direction X of the cell body 1. The plurality of batteries 100 includes at least a first battery 100A and a second battery 100B. The first side seal 22 of the first battery 100A is disposed adjacent to the second side seal 23 of the second battery 100B. The distance D between the first end face of the first side seal 22 of the first cell 100A and the second end face of the second side seal 23 of the second cell 100B satisfies: d is more than or equal to 0.2mm and less than or equal to 4 mm.

The cell body 1 is a core component of the battery 100 for realizing the charge and discharge functions. The battery cell body 1 comprises a positive pole piece, a negative pole piece and a diaphragm separating the positive pole piece from the negative pole piece. The positive pole piece comprises a positive current collector and a positive active substance layer coated on the surface of the positive current collector, the positive current collector can be an aluminum foil, and the positive active substance layer comprises a ternary material, lithium manganate or lithium iron phosphate. The negative pole piece comprises a negative current collector and a negative active substance layer coated on the surface of the negative current collector, the negative current collector can be a copper foil, and the negative active substance layer comprises graphite or silicon.

The cell body 1 may have a laminated structure. Specifically, the positive electrode plates are provided in plurality, the negative electrode plates are provided in plurality, the positive electrode plates and the negative electrode plates are alternately stacked in the thickness direction Z of the cell body 1, and the positive electrode plates and the negative electrode plates are separated by the diaphragm.

Alternatively, the cell body 1 may also be a winding structure. Specifically, the positive electrode plate and the negative electrode plate are both one, and the positive electrode plate and the negative electrode plate are in a belt-shaped structure. The positive electrode plate, the diaphragm and the negative electrode plate are sequentially stacked and wound for more than two turns to form the cell body 1. The cell body 1 may be flat.

Referring to the example shown in fig. 2, the packaging bag 2 includes a first packaging film 2a and a second packaging film 2b, and the cell body 1 is disposed between the first packaging film 2a and the second packaging film 2 b. The first packaging film 2a and the second packaging film 2b are arranged up and down in the thickness direction Z of the cell body 1.

The first packaging film 2a has a first inner cavity S1, and the cell body 1 is at least partially accommodated in the first inner cavity S1. The first inner cavity S1 may be formed by drawing the first wrapping film 2a by punching. In the embodiment shown in fig. 2, the second packaging film 2b is formed into the second inner cavity S2 by punching, a part of the cell body 1 is accommodated in the first inner cavity S1, and another part of the cell body 1 is accommodated in the second inner cavity S2. In an alternative embodiment, the second packaging film 2b may be flat.

The first packaging film 2a and the second packaging film 2b may be provided integrally or separately. For example, the first wrapping film 2a and the second wrapping film 2b may be formed by folding a sheet of wrapping film (e.g., aluminum plastic film, steel plastic film, etc.). Specifically, referring to fig. 2, two cavities may be formed in the one sheet of packaging film by punching, and then the one sheet of packaging film is bent into two layers, i.e., a first packaging film 2a and a second packaging film 2b of the present application are formed. The two cavities are respectively the first cavity S1 of the first packaging film 2a and the second cavity S2 of the second packaging film 2 b. The cell body 1 is disposed between the first packaging film 21 and the second packaging film 22, and the two cavities enclose a space for accommodating the cell body 1.

In the battery cell according to the present disclosure, referring to fig. 5 to 21, by spacing a first end surface of a first side seal 22 of a first battery 100A and a second end surface of a second side seal 23 of a second battery 100B, which are adjacently disposed, by a distance D, the distance D satisfies: d is more than or equal to 0.2mm and less than or equal to 4mm, so that the first end face and the second end face are prevented from being contacted, and the possibility of electrochemical corrosion caused by the contact between the end faces of the edge sealing structures of the adjacent batteries can be reduced or even avoided.

Fig. 2 to 4 are schematic diagrams of a state before molding of each battery of the battery unit of the present disclosure, and referring to fig. 2 to 4, a cell body 1 is bagged (referred to as a packaging bag 2) to seal a space for accommodating the cell body 1 by heat pressing, so that a first side seal portion 22 and a second side seal portion 23 are formed on both sides of a main body portion 21 of the packaging bag 2 in a transverse direction X of the cell body 1, and in an unfolded state, the first side seal portion 22 and the second side seal portion 23 are parallel to a large surface 211 of the cell body 1. In some embodiments, in a state where both the first side seal 22 and the second side seal 23 are unfolded to be parallel to the large face 211 of the cell body 1, the size of the second side seal 23 in the transverse direction X of the cell body 1 may be larger than the size of the first side seal 22 in the transverse direction X of the cell body 1, but is not limited thereto. As shown in fig. 4, W1 represents the dimension of the first side seal 22 of the battery 100 in the transverse direction X of the cell body 1, and W2 represents the dimension of the second side seal 23 of the battery 100 in the transverse direction X of the cell body 1. The large surface 211 is a plane perpendicular to the thickness direction Z of the cell body 1, the transverse X of the cell body 1 and the longitudinal Y of the cell body 1 are directions perpendicular to the thickness direction Z of the cell body 1, and the transverse X of the cell body 1, the longitudinal Y of the cell body 1 and the thickness direction Z of the cell body 1 are two-two perpendicular.

Referring to fig. 5 to 11, in some embodiments, a distance D between the first end surface 22a of the first side seal 22 of the first battery 100A and the second end surface 23a of the second side seal 23 of the second battery 100B in the thickness direction Z of the cell body 1 satisfies: d is more than or equal to 0.2mm and less than or equal to 4 mm.

Referring to the example shown in fig. 5 to 8, the second side seal 23 of each cell 100 of the battery unit extends in the thickness direction Z of the cell body 1, and the second end face 23a of the second side seal 23 is higher than the first end face 22a of the first side seal 22 in the thickness direction Z. Wherein, first side seal portion 22 and second side seal portion 23 all adopt single hem structure, just buckle once promptly, and second side seal portion 23 and first side seal portion 22 all extend along the thickness direction Z of cell body 1, can reduce the encapsulation space of following the horizontal X consumption of cell body 1 to save encapsulation space, provide bigger available space for cell body 1 on its horizontal X, improve the energy density of battery. In addition, the packaging bag 2 is mainly divided into a three-layer structure of a protective layer, a metal layer and a fusion layer. After packaging and trimming, the metal layer at the edge of the packaging edge (i.e. the first end surface 22a of the first side seal 22 and the second end surface 23a of the second side seal 23) cannot be wrapped and exposed. In fig. 6, H represents a height difference formed between the second end surface 23a of the second side seal 23 and the first end surface 22a of the first side seal 22. When at least two cells 100 are arranged in sequence, the first side seal 22 of one cell is arranged adjacent to the second side seal 23 of the other cell, and the first end face 22a of the first side seal 22 of the one cell and the second end face 23a of the second side seal 23 of the other cell form a height difference H, so that the distance between the first end face 22a of the first side seal 22 of the one cell and the second end face 23a of the second side seal 23 of the other cell can be enlarged, and the possibility of electrochemical corrosion caused by the side seal structure contact (metal layer contact of the adjacent side seals) of the adjacent cells is greatly reduced, thereby reducing the safety risk.

Referring to the example shown in fig. 9 to 11, the battery unit includes a plurality of batteries according to the embodiment shown in fig. 5 to 8, and the plurality of batteries 100 includes a first battery 100A and a second battery 100B. The first side seal 22 of the first battery 100A is disposed adjacent to the second side seal 23 of the second battery 100B.

As shown in the embodiments of fig. 9 to 11, the second side seal 23 of the second battery 100B extends in the thickness direction Z of the cell body 1, the first side seal 22 of the first battery 100A extends in the thickness direction Z of the cell body 1, and the second end face 23a of the second side seal 23 of the second battery 100B is higher than the first end face 22a of the first side seal 22 of the first battery 100A in the thickness direction Z. In fig. 11, D indicates a distance D between the first end surface 22a of the first side seal 22 of the first battery 100A and the second end surface 23a of the second side seal 23 of the second battery 100B in the thickness direction Z of the cell body 1, so that the distance between the first end surface 22a of the first side seal 22 of the first battery 100A and the second end surface 23a of the second side seal 23 of the second battery 100B can be increased, and the possibility of electrochemical corrosion caused by contact between the first side seal 22 of the first battery 100A and the second side seal 23 of the second battery 100B can be greatly reduced, so as to reduce the safety risk. Moreover, the second side seal portion 23 of the second battery 100B and the first side seal portion 22 of the first battery 100A both extend along the thickness direction Z of the cell body 1, which can reduce the packaging space consumed along the transverse direction X of the cell body 1, thereby saving the packaging space, providing a larger available space for the cell body 1 in the transverse direction X thereof, and improving the energy density of the battery unit.

Referring to fig. 9 to 11, in the thickness direction Z of the cell body 1, a distance D between the second end surface 23a of the second side seal 23 of the second battery 100B and the first end surface 22a of the first side seal 22 of the first battery 100A in the thickness direction Z is not less than 1/3 of the size of the first side seal 22 in the thickness direction Z of the cell body 1. A large distance can be ensured between the first end face 22a of the first side seal 22 of the adjacent first cell 100A and the second end face 23a of the second side seal 23 of the second cell 100B, and the possibility of electrochemical corrosion caused by contact between the side seals of the adjacent cells is greatly reduced.

Referring to fig. 5 to 11, in some embodiments, the number of the large surfaces 211 of the main body portion 21 of each battery 100 is two, the two large surfaces 211 are arranged in a reverse manner along the thickness direction Z of the battery cell body 1, and the second end surface 23a of the second side sealing portion 23 is located between the two large surfaces 211, so as to prevent the second end surface 23a of the second side sealing portion 23 from protruding out of the large surface 211 to occupy a space in the thickness direction Z of the battery cell body 1, and improve the space utilization rate.

Referring to fig. 12 to 21, in some embodiments, a distance D between the first end face 22a of the first side seal 22 of the first battery 100A and the second end face 23a of the second side seal 23 of the second battery 100B in the transverse direction X of the cell body satisfies: d is more than or equal to 0.2mm and less than or equal to 4 mm. Referring to the example illustrated in fig. 12 to 15, the first side seal 22 of each battery 100 of the battery unit extends in the thickness direction Z, and the second side seal 23 may include a first portion 231, a bent portion 232, and a second portion 233, the first portion 231 extends in the thickness direction Z of the cell body 1, the bent portion 232 connects the first portion 231 and the second portion 233, and the second portion 233 is located between the first portion 231 and the main body portion 21. The second side sealing portion 23 is of a double-folded structure, that is, is bent twice, and since the first side sealing portion 22 is of a single-folded structure, that is, is bent once, compared with the case where all the side sealing portions of the battery are of a double-folded structure, the battery 100 of the present disclosure can reduce the packaging space consumed along the transverse X of the battery cell body 1, thereby saving the packaging space, providing a larger available space for the battery cell body 1 in the transverse X thereof, and improving the energy density of the battery. In addition, since the second side sealing portion 23 can adopt a double-folded structure, when at least two cells 100 are arranged in sequence, the first side sealing portion 22 of one cell is arranged adjacent to the second side sealing portion 23 of another cell, and the first end face 22a of the first side sealing portion 22 of one cell is spaced from the second end face 23a of the second side sealing portion 23 of another cell by the first portion 231, so that electrochemical corrosion caused by contact of the side sealing portion structures of the adjacent cells (contact of metal layers of the adjacent side sealing portions) can be prevented, and safety risk can be reduced.

Referring to the example shown in fig. 16 to 21, the battery unit includes a plurality of batteries according to the embodiment shown in fig. 12 to 15, and the plurality of batteries 100 includes a first battery 100A and a second battery 100B. The first side seal 22 of the first battery 100A is disposed adjacent to the second side seal 23 of the second battery 100B.

As shown in the embodiments of fig. 16 to 21, the first side seal 22 of the first battery 100A extends in the thickness direction Z of the cell body 1, the second side seal 23 of the second battery 100B includes a first portion 231, a bent portion 232, and a second portion 233, the first portion 231 extends in the thickness direction Z of the cell body 1, the bent portion 232 connects the first portion 231 and the second portion 233, and the second portion 233 is located between the first portion 231 and the main body portion 21. The first side seal 22 of the first cell 100A is disposed adjacent to the second side seal 23 of the second cell 100B, the second side seal 23 of the second cell 100B is of a double-folded structure, and the first end face 22a of the first side seal 22 of the first cell 100A is spaced apart from the second end face 23a of the second side seal 23 of the second cell 100B by the first portion 231, so that the first side seal 22 of the first cell 100A and the second side seal 23 of the second cell 100B can be prevented from contacting to cause electrochemical corrosion, and safety risks can be avoided. Moreover, since the second side sealing portion 23 of the second battery 100B adopts a double-folded structure and the first side sealing portion 22 of the first battery 100A adopts a single-folded structure, compared with the case where all the side sealing portions of the batteries adopt double-folded structures, the packaging space consumed along the transverse direction X of the battery cell body 1 can be reduced, so that the packaging space is saved, a larger available space is provided for the battery cell body 1 in the transverse direction X thereof, and the energy density of the battery cell is improved.

In some embodiments, the second portion 233 of the second side sealing part 23 of each battery may be adhered to the lateral surface 212 of the main body part 21 to prevent the second portion 233 of the second side sealing part 23 from being folded back to affect the battery packaging effect.

In the embodiment shown in fig. 16 to 21, the top surface of the bent portion 232 of the second side sealing portion 23 of the second battery 100B of the battery unit is located between the two large surfaces 211, so as to prevent the top surface of the bent portion 232 from protruding out of the large surface 211 to occupy the space in the thickness direction Z of the battery cell body 1, and improve the space utilization rate.

Referring to fig. 2, 5 and 12, in some embodiments, the packaging bag 2 of each battery 100 of the battery unit further includes a top seal portion 24, the top seal portion 24 is located on one side of the main body portion 21 in the longitudinal direction Y of the cell body 1, and the tab 3 is connected to the cell body 1, passes through the top seal portion 24 and extends to the outside of the packaging bag 2. The tab 3 is set to be two, one tab 3 is connected to the positive current collector of the positive pole piece, and the other tab 3 is connected to the negative current collector of the negative pole piece. The tab 3 may connect the cell body 1 with a member, such as a protective plate (not shown), outside the packaging bag 2, so as to charge and discharge the cell body 1. The material of the tab 3 can be aluminum, nickel or copper nickel plating. Of course, in other embodiments, the tab 3 may also pass through the first side seal 22 and/or the second side seal 23; or in some embodiments, one tab 3 passes through the first side seal 22 or the second side seal 23 and the other tab 3 passes through the top seal 24.

The above detailed description describes exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (10)

1. A battery unit comprising a plurality of batteries;

each battery comprises a battery cell body and a packaging bag, wherein the packaging bag comprises a main body part, a first side sealing part and a second side sealing part, the battery cell body is accommodated in the main body part, and the first side sealing part and the second side sealing part are respectively positioned on two sides of the main body part along the transverse direction of the battery cell body;

the plurality of batteries includes at least a first battery and a second battery; it is characterized in that the preparation method is characterized in that,

the first side seal part of the first battery is arranged adjacent to the second side seal part of the second battery;

the distance D between the first end face of the first side seal part of the first battery and the second end face of the second side seal part of the second battery satisfies the following conditions: d is more than or equal to 0.2mm and less than or equal to 4 mm.

2. The battery unit of claim 1, wherein a distance D between the first end surface of the first side seal of the first battery and the second end surface of the second side seal of the second battery in the thickness direction of the cell body satisfies: d is more than or equal to 0.2mm and less than or equal to 4 mm.

3. The battery cell as recited in claim 2 wherein the second side seal of the second cell extends in the thickness direction, the first side seal of the first cell extends in the thickness direction, and the second end face of the second side seal of the second cell is higher in the thickness direction than the first end face of the first side seal of the first cell.

4. The battery cell according to claim 3, wherein a distance D in the thickness direction between the second end face of the second side seal of the second cell and the first end face of the first side seal of the first cell in the thickness direction is not less than 1/3 of a dimension of the first side seal in the thickness direction.

5. The battery unit according to claim 3, wherein the number of the large faces of each battery is two, the two large faces are arranged oppositely in the thickness direction, and the second end face of the second side seal part is located between the two large faces.

6. The battery unit of claim 1, wherein a distance D between the first end surface of the first side seal of the first battery and the second end surface of the second side seal of the second battery in the transverse direction of the cell body satisfies: d is more than or equal to 0.2mm and less than or equal to 4 mm.

7. The battery cell according to claim 6, wherein the first side seal of the first battery extends in the thickness direction, the second side seal of the second battery comprises a first portion extending in the thickness direction, a bent portion connecting the first portion and the second portion, and a second portion between the first portion and the main body portion.

8. The battery unit according to claim 7, wherein the number of the large faces of each battery is two, the two large faces are arranged opposite to each other in the thickness direction, and the top surface of the bent portion of the second side sealing part is located between the two large faces.

9. The battery cell as recited in claim 7 wherein the second portion of the second side seal portion of each cell is adhered to a side surface of the body portion.

10. A terminal device, characterized in that it comprises a battery unit according to any one of claims 1-9.

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