CN217848254U - Battery unit and battery device - Google Patents

Abstract

The embodiment of the utility model provides a relate to battery technical field, and disclose a battery unit and battery device, battery unit includes body and first insulation layer. The body has a large face, and of the outer surface of the body, only the large face is provided with the first insulating layer. The utility model discloses battery unit only sets up the first insulation layer at the big face of body, because the big face of great area is more convenient for set up the first insulation layer, and then has simplified production technology, improves the production efficiency of battery, has also reduced material cost.

Description

Battery unit and battery device

Technical Field

The embodiment of the utility model provides a relate to battery technical field, particularly, relate to a battery unit and battery device.

Background

In recent years, power batteries have been widely used in the fields of electric vehicles, electric bicycles, electric trains, and the like because of their advantages such as high energy density, good cycle stability, and long service life.

When a plurality of battery cells are grouped, it is necessary to perform insulation treatment on each battery cell to ensure safety. However, the outer shape of the battery cell in the related art is mostly irregular, resulting in a complicated process of the insulation treatment and a high cost.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a battery unit reaches battery device including this battery unit to solve the complicated and with high costs problem of technology that exists among the correlation technique.

The utility model discloses battery unit, including body and first insulation layer. The body has a large face, and the first insulating layer is provided only on the large face, among outer surfaces of the body.

The utility model discloses battery device, including a plurality of foretell battery cell, it is a plurality of the battery cell arranges side by side, adjacent two is located on battery cell's first insulation layer between the body.

An embodiment of the above utility model has at least the following advantages or beneficial effects:

the utility model discloses battery unit only sets up the first insulation layer on the big face of the surface of body, because the big face of great area is more convenient for set up the first insulation layer, and then has simplified production technology, improves the production efficiency of battery. And moreover, the material cost is also reduced.

Drawings

Fig. 1 is an exploded schematic view of a battery device according to an embodiment of the present invention.

Fig. 2 is an exploded view of the battery pack of fig. 1.

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

Figure 4 shows a perspective view of the body, pole assembly and injection structure of figure 3 from one perspective.

Fig. 5 shows a perspective view of the body, pole assembly and injection structure of fig. 3 from another perspective.

Fig. 6 shows a schematic view of a plurality of battery cells arranged side by side.

Fig. 7 showsbase:Sub>A cross-sectional view alongbase:Sub>A-base:Sub>A in fig. 6.

Fig. 8 shows a partial enlarged view at X1 in fig. 7.

Fig. 9 is a schematic view illustrating the terminal post assembly exposed to the first insulating layer.

Fig. 10 is a schematic diagram illustrating the liquid injection structure exposed to the first insulating layer.

Fig. 11 is a cross-sectional view of a second embodiment of the present invention, showing a flange structure covered with a second insulating layer.

Fig. 12 shows a partial enlarged view at X2 in fig. 6.

Figure 13 shows a schematic view of a first embodiment of the insulation assembly.

Fig. 14 shows an exploded view of a second embodiment of the insulation assembly.

Fig. 15 shows a partially enlarged view at X3 in fig. 13.

Wherein the reference numerals are as follows:

10. battery device

100. Box body

101. Upper cover

102. Base plate

103. Structural beam

200. Battery pack

1. Battery unit

11. Body

111. Top surface of the container

112. Bottom surface

113. End face

114. Side surface

115. Liquid injection structure

116. Liquid filling port

117. Sealing element

12. A first insulating layer

121. A first opening

122. Second opening

13. Pole component

14. Flange structure

141. First surface

142. Second surface

143. Third surface

15. A second insulating layer

151. The first coating part

152. Second coating part

16. First adhesive layer

17. Second adhesive layer

2. Insulating assembly

21. End insulating support

22. Top insulator

23. Bottom insulation

24. Hollow structure

25. Accommodating part

3. Cover layer

4. Bus bar

5. Acquisition circuit board

6. Insulation structure

D1, first direction

D2, second direction

D3, third direction

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in fig. 1, fig. 1 is an exploded schematic view of a battery device 10 according to an embodiment of the present invention. The battery device 10 of the embodiment of the present invention includes a case 100 and a battery pack 200, and the battery pack 200 is disposed in the case 100.

It is to be understood that the terms "comprises" and "comprising," and any variations thereof, in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The cabinet 100 may include an upper cover 101, a bottom plate 102, and structural beams 103. The upper cover 101 and the base plate 102 are oppositely disposed, the structural beam 103 is disposed between the upper cover 101 and the base plate 102, and the structural beam 103 is connected to the upper cover 101 and the base plate 102. The upper cover 101, the base plate 102 and the structural beams 103 enclose a chamber for accommodating the battery pack 200.

As shown in fig. 2, fig. 2 is an exploded schematic view of the battery pack 200 of fig. 1. The battery pack 200 includes a plurality of battery cells 1, an insulating assembly 2, a cover layer 3, a plurality of bus bars 4, a collecting wiring board 5, and an insulating structure 6.

The plurality of battery cells 1 are arranged side by side, the insulating assembly 2 is connected to the plurality of battery cells 1, and the plurality of bus bars 4 are connected to the insulating assembly 2 and to the plurality of battery cells 1. The collecting circuit board 5 is disposed on one side of the plurality of battery units 1, connected to the plurality of busbars 4, and used for collecting signals of the battery units 1.

It will be appreciated that the collected cell 1 signals may include temperature, current, voltage, etc.

The insulation structure 6 is connected with the insulation component 2 and covers the collection circuit board 5 and the bus bar 4, so that the insulation of the bus bar 4 and the collection circuit board 5 is realized.

As shown in fig. 3 to 5, fig. 3 is an exploded schematic view of the battery unit 1 according to the embodiment of the present invention. Fig. 4 shows a perspective view of the body 11, the pole assembly 13 and the liquid injection structure 115 in fig. 3 from one perspective. Fig. 5 shows a perspective view of the body 11, the pole assembly 13 and the liquid injection structure 115 in fig. 3 from another perspective. The battery cell 1 comprises a body 11, a first insulating layer 12, a pole assembly 13 and a flange structure 14.

The body 11 extends along the first direction D1, the second direction D2 and the third direction D3 to form a substantially cubic body. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other two by two.

The body 11 has a top surface 111, a bottom surface 112, two end surfaces 113, and two side surfaces 114. The top surface 111 and the bottom surface 112 are disposed opposite to each other along the second direction D2, the two end surfaces 113 are disposed opposite to each other along the first direction D1, each end surface 113 is connected to the top surface 111 and the bottom surface 112, respectively, the two side surfaces 114 are disposed opposite to each other along the third direction D3, and each side surface 114 is connected to the top surface 111, the bottom surface 112, and the two end surfaces 113, respectively. The top surface 111, the bottom surface 112, and the end surface 113 each have an area smaller than that of the side surface 114.

It should be noted that the two oppositely disposed side surfaces 114 are "large surfaces" of the body 11, and the top surface 111, the bottom surface 112, and the two end surfaces 113 are "small surfaces" of the body 11. The area of the large face is larger than that of the small face.

As an example, the size of the body 11 along the first direction D1 is much larger than the size of the body 11 along the second direction D2 and the third direction D3, so that the body 11 forms a flat rectangular parallelepiped structure, but not limited thereto.

When the plurality of battery cells 1 are arranged side by side, the plurality of battery cells 1 are arranged side by side along the third direction D3. The side surfaces 114 of two adjacent battery units 1 are correspondingly arranged.

Of the outer surfaces of the body 11, the first insulating layer 12 is provided only at the side surfaces 114 (large surfaces), and the first insulating layer 12 is not provided at the top surface 111, the bottom surface 112, and the end surfaces 113 of the body 11, thereby achieving insulation between the adjacent battery cells 1.

The utility model discloses battery unit 1 in the surface of body 11, only sets up first insulation layer 12 in side 114 (big face), because the area of top surface 111, bottom surface 112 and terminal surface 113 all is less than the area of side 114, and the side 114 of great area is more convenient for set up first insulation layer 12, and then has simplified production technology, has improved the production efficiency of battery. In addition, the first insulating layer 12 is only covered on the side surface 114 of the body 11, but is not arranged on the top surface 111, the bottom surface 112 and the end surface 113, so that the material cost is reduced.

It is understood that the two side surfaces 114 of the body 11 may or may not have the same shape and size, and the present invention is not limited thereto.

As shown in fig. 6 to 7, fig. 6 is a schematic view showing a plurality of battery cells 1 arranged side by side. Fig. 7 showsbase:Sub>A cross-sectional view alongbase:Sub>A-base:Sub>A in fig. 6. Fig. 8 shows a partial enlarged view at X1 in fig. 7. Only one side 114 of the two sides 114 of the body 11 is provided with the first insulating layer 12. When a plurality of battery cells 1 are arranged side by side, the first insulating layer 12 is provided between two adjacent bodies 11. That is, the first insulating layers 12 and the bodies 11 of the plurality of battery cells 1 are alternately arranged along the arrangement direction of the plurality of battery cells 1 (i.e., along the third direction D3).

The first insulating layer 12 is only arranged on one side surface 114 of the body 11, so that the insulation between the adjacent battery units 1 can be realized, the processing time and the material cost can be saved, and the effects of cost reduction and efficiency improvement can be achieved.

It is understood that the first insulating layer 12 may be a thin film structure, but is not limited thereto. The first insulating layer 12 adopting the thin film structure is more convenient for grouping a plurality of battery units 1, and the structure of the thin film is more stable, so that the insulating effect is ensured.

When the first insulating layer 12 is a thin film structure, it can be adhered to the side surface 114 of the body 11. As an example, the first adhesive layer 16 may be disposed between the first insulating layer 12 and the side surface 114 of the body 11.

The first adhesive layer 16 may include a double-sided tape. Further, the first adhesive layer 16 may be a double-sided foam adhesive.

Of course, in other embodiments, the first insulating layer 12 may also be an insulating coating. The first insulating layer 12 is formed on the side surface 114 of the body 11 by spraying, which is more beneficial to improving the production efficiency of the battery.

As shown in fig. 3 and 9, fig. 9 is a schematic view illustrating the pole assembly 13 exposed to the first insulating layer 12. The pole assembly 13 is protruded from the side surface 114 of the body 11. As an example, the pole assembly 13 is protruded on the side 114 provided with the first insulating layer 12. The number of the pole assemblies 13 is two, and the two pole assemblies 13 are respectively located at two ends of the body 11 along the first direction D1 of the body 11. One of the pole assemblies 13 serves as the positive electrode of the battery unit 1, and the other pole assembly 13 serves as the negative electrode of the battery unit 1.

The pole assembly 13 is connected with the bus bar 4 by welding. Two ends of one bus bar 4 are respectively connected with two adjacent pole assemblies 13 of two adjacent battery units 1.

The first insulating layer 12 has a first opening 121, and the first opening 121 penetrates through two opposite surfaces of the first insulating layer 12 in a thickness direction of the first insulating layer 12. At least a part of the pole assembly 13 is exposed on a side surface of the first insulating layer 12 opposite to the body 11 through the first opening 121. By forming the first opening 121 on the first insulating layer 12, at least a portion of the pole assembly 13 is exposed to the first insulating layer 12 through the first opening 121, so that the electrical connection between the pole assembly 13 and the bus bar 4 is not affected by the arrangement of the first insulating layer 12.

It is understood that the first opening 121 may be sized to expose all of the pole post assembly 13 out of the first insulating layer 12, or to expose part of the pole post assembly 13 out of the first insulating layer 12.

When a portion of the pole assembly 13 is exposed to the first insulating layer 12, the welding surface of the pole assembly 13 is exposed to a side surface of the first insulating layer 12 opposite to the body 11 through the first opening 121. That is, the first insulating layer 12 covers a portion of the pole assembly 13 at this time.

With reference to fig. 3 and fig. 9, the main body 11 further has a liquid injection structure 115, the liquid injection structure 115 is disposed on a side surface 114 of the main body 11, and the electrolyte can be injected into the main body 11 through the liquid injection structure 115. As an example, the liquid injection structure 115 is provided at the side 114 where the first insulating layer 12 is provided.

The first insulating layer 12 covers the liquid injection structure 115. The first insulating layer 12 not only plays an insulating role, but also can coat the liquid injection structure 115, so as to achieve a sealing effect.

As an example, the injection structure 115 can include an injection port 116 and a seal 117. The liquid inlet 116 is opened in the main body 11 and communicates with the inside of the main body 11. The sealing material 117 seals the liquid inlet 116, and prevents the electrolyte in the main body 11 from flowing out. After the sealing member 117 is sealed at the pouring outlet 116, the first insulating layer 12 covers the sealing member 117.

Of course, in other embodiments, at least a portion of the injection structure 115 may also be exposed to the first insulating layer 12. As shown in fig. 10, fig. 10 is a schematic diagram illustrating the injection structure 115 exposed to the first insulating layer 12. The first insulating layer 12 has a second opening 122, the second opening 122 penetrates through two opposite surfaces of the first insulating layer 12 along a thickness direction of the first insulating layer 12, and the liquid injection structure 115 is exposed on a surface of the first insulating layer 12 opposite to the body 11 through the second opening 122.

For example, a part of the sealing member 117 is exposed to a side surface of the first insulating body 11 through the second opening 122.

As shown in fig. 5 and 8, the battery unit 1 further includes a flange structure 14, and the flange structure 14 is protruded from the body 11. As an example, the flange structure 14 surrounds the outer periphery of the body 11 in a plane formed by the first and second directions D1 and D2. In other words, the flange structure 14 is protruded from the top surface 111, the bottom surface 112, and the two end surfaces 113.

The battery unit 1 further includes a second insulating layer 15, and the second insulating layer 15 covers at least a portion of the flange structure 14. The first insulating layer 12 covers at least a portion of the flange structure 14, so as to protect the flange structure 14 and insulate the flange structure 14.

With continued reference to fig. 8, the flange structure 14 has a first surface 141 and a second surface 142, the first surface 141 is flush with one of the side surfaces 114 (large surface), and the second surface 142 is connected to the first surface 141. The second insulating layer 15 includes a first cladding portion 151, and the first cladding portion 151 is cladded on the first surface 141 and the second surface 142.

As an example, the first surface 141 is perpendicular to the second surface 142. The side of the first cladding 151 facing the flange structure 14 has a right-angled structure, so that the first cladding 151 is adapted to the shape of the flange structure 14 to ensure the insulation effect.

As shown in fig. 11, fig. 11 is a cross-sectional view showing a flange structure 14 covered with a second insulating layer 15 according to a second embodiment of the present invention. The flange structure 14 further has a third surface 143, and the third surface 143 is disposed opposite to the first surface 141 and connected to the second surface 142. The second insulating layer 15 further includes a second cladding portion 152, and the second cladding portion 152 is connected to the first cladding portion 151 and wraps the third surface 143.

In the present embodiment, the first coating portion 151 and the second coating portion 152 entirely cover the outer surface of the flange structure 14 protruding from the body 11, thereby improving the reliability of insulation.

As an example, the third surface 143 is parallel to the first surface 141 and perpendicular to the second surface 142. The second insulating layer 15 is adapted to the outer surface of the flange structure 14, i.e. the cross-sectional shape of the second insulating layer 15 is substantially n-shaped.

It is understood that the first insulating layer 12 and the second insulating layer 15 may be a unitary structure, but not limited thereto. When the first insulating layer 12 and the second insulating layer 15 are an integral structure, the flange structure 14 and the side surface 114 of the body 11 have better insulating effect, and the outer surface of the body 11 has better consistency.

In one embodiment, the second insulating layer 15 is snapped onto the flange structure 14. When the second insulating layer 15 is connected with the flange structure 14, the second insulating layer 15 can also perform an insulating function on the flange structure 14, and the insulating reliability is further improved.

As shown in fig. 3 and 12, fig. 12 is a partially enlarged view at X2 in fig. 6. The side of the first insulating layer 12 facing away from the body 11 is provided with a second adhesive layer 17, and the adjacent battery cells 1 are connected by the second adhesive layer 17.

As shown in fig. 12, along the arrangement direction of the plurality of battery cells 1, the body 11 and the first insulating layer 12 of one of the battery cells 1, the second adhesive layer 17, and the body 11 and the first insulating layer 12 of another adjacent battery cell 1 are provided, respectively.

In one embodiment, the second adhesive layer 17 may be a double-sided tape. Further, the second adhesive layer 17 is a double-sided foam adhesive.

When the second adhesive layer 17 is a foam double-sided tape, the foam double-sided tape can absorb the tolerance of the side surfaces 114 of the adjacent battery cells 1. And after the foam double-sided adhesive tape is compressed and pre-tightened, a bulging space is provided for the battery unit 1, and the cycle performance of the battery is ensured.

It is understood that the side of the first insulating layer 12 facing away from the body 11 may be provided with a plurality of second adhesive layers 17 in a band shape, and the second adhesive layers 17 may extend along the first direction D1 or the second direction D2. Of course, a portion of the second adhesive layer 17 may extend along the first direction D1, and another portion of the second adhesive layer 17 may extend along the second direction D2.

As shown in fig. 2 and 13, fig. 13 is a schematic view of a first embodiment of the insulation assembly 2. The insulation assembly 2 is connected to the battery cell 1, and includes an end insulation support 21, a bottom insulation member 23, and a cap 3, the end insulation support 21 being connected to an end of the battery cell 1 in the first direction D1. The bottom insulator 23 is disposed on the bottom surface 112 of the body 11 and connected to the end insulator 21. A bottom insulator 23 and an end insulating bracket 21 are attached to the base plate 102 for achieving insulation between the battery unit 1 and the base plate 102. The cover layer 3 is disposed on the top surface of the battery unit 1 and connected to the end insulating support 21.

The bottom insulator 23 and the end insulator bracket 21 may be connected to the base plate 102 by bonding, but not limited thereto.

In an embodiment, the end insulating support 21 and the bottom insulating member 23 may be an integral structure or a separate structure. When the end insulating support 21 and the bottom insulating member 23 are separate structures, the end insulating support 21 and the bottom insulating member 23 may be detachably connected, which is more convenient for the end insulating support 21 and the bottom insulating member 23 to be mounted on the battery unit 1.

It will be appreciated that the cover layer 3 may be a cover plate or an insulating film.

In one embodiment, the insulating member 2 at least partially overlaps the first insulating layer 12 in the arrangement direction of the plurality of battery cells 1.

As an example, the end insulating support 21 and the bottom insulating member 23 each at least partially overlap the first insulating layer 12 in the arrangement direction of the plurality of battery cells 1.

The connection mode of the end insulating bracket 21 and the battery unit 1 may be bonding or clamping, but is not limited thereto. As an example, when the end insulating support 21 is bonded to the battery cell 1, the end insulating support 21 may be bonded to the body 11 of the battery cell 1, and the end insulating support 21 covers a portion of the first insulating layer 12, such that the end insulating support 21 at least partially overlaps the first insulating layer 12 along the third direction D3.

Referring to fig. 13, the bottom insulator 23 has a hollow structure 24. On the one hand, the hollowed-out structure 24 can reduce the weight of the bottom insulator 23, thereby reducing the overall weight of the battery device 10. On the other hand, the hollow-out structures 24 can contain the adhesive, so that the adhesive can be quantitatively coated in the hollow-out structures 24 of the bottom insulating part 23 at fixed points, the adhesive can be more favorably and uniformly coated, and the adhesive strength between the bottom insulating part 23 and the bottom plate 102 is improved.

As shown in fig. 14, fig. 14 is an exploded view of a second embodiment of the insulation assembly 2. The insulation assembly 2 includes an end insulation holder 21, a bottom insulation 23, and a top insulation 22, and the end insulation holder 21 is coupled to an end of the battery cell 1 in the first direction D1. The bottom insulator 23 is disposed on the bottom surface 112 of the body 11 and connected to the end insulator 21. The top insulator 22 is disposed on the top surface 111 of the body 11 and connected to the end insulator bracket 21.

In one embodiment, the end insulator support 21 and the bottom insulator 23 may be a unitary structure, and the top insulator 22 and the end insulator support 21 may be detachably connected.

In another embodiment, the end insulating support 21 and the top insulating member 22 may be an integral structure, and the bottom insulating member 23 and the end insulating support 21 may be detachably connected.

In yet another embodiment, the end insulator support 21, the top insulator 22 and the bottom insulator 23 are of a unitary construction.

Of course, the end insulating support 21 and the top insulating member 22 may be detachably connected, and the end insulating support 21 and the bottom insulating member 23 may be detachably connected.

As shown in fig. 14, the top insulator 22 is provided with an open structure 24. In one aspect, the cutouts 24 reduce the weight of the top insulator 22, thereby reducing the overall weight of the battery device 10. On the other hand, the hollow-out structures 24 can accommodate the adhesive glue, so that the adhesive glue can be quantitatively coated in the hollow-out structures 24 of the top insulators 22 at fixed points, the adhesive glue can be more favorably and uniformly coated, and the adhesive strength between the top insulators 22 and the top surface 111 of the body 11 is improved.

In the arrangement direction of the plurality of battery cells 1, the end insulating support 21, the top insulating member 22, and the bottom insulating member 23 each at least partially overlap the first insulating layer 12.

As shown in fig. 15, fig. 15 is a partially enlarged view at X3 in fig. 13. The insulating assembly 2 is provided with an accommodating portion 25 at a position facing the battery unit 1, and the accommodating portion 25 accommodates at least part of the flange structure 14 in a protruding direction of the flange structure 14 of the battery unit 1.

As an example, the end insulating bracket 21 is provided with a receiving portion 25 at a side facing the battery unit 1, the top insulating member 22 is provided with a receiving portion 25 at a side facing the battery unit 1, and the bottom insulating member 23 is provided with a receiving portion 25 at a side facing the battery unit 1.

In addition, since the second insulating layer 15 covers the flange structure 14, at least a part of the second insulating layer 15 is also accommodated in the accommodating portion 25.

It is understood that the receiving portion 25 may include a groove or a step structure, but is not limited thereto.

When the accommodating portion 25 is a groove, the accommodating portion 25 of the end insulating support 21, the accommodating portion 25 of the top insulating member 22, and the accommodating portion 25 of the bottom insulating member 23 communicate with each other to form an annular groove for accommodating the flange structure 14 and the second insulating layer 15 in the projecting direction of the flange structure 14.

It is understood that the various embodiments/implementations provided by the present invention can be combined without contradiction, and are not illustrated herein.

In the embodiments of the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are used broadly and should be construed to include, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

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

In the description of the present specification, the terms "one embodiment," "some embodiments," "specific embodiments," and the like, 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 an embodiment of the invention. In this specification, the schematic representations of the terms used above do not necessarily 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.

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

Claims (23)

1. A battery cell, comprising:

a first insulating layer; and

a body having a large face, in an outer surface of the body, the first insulating layer being provided only on the large face.

2. The battery cell according to claim 1, wherein the first insulating layer is provided on only one of the large faces in an outer surface of the body.

3. The battery cell of claim 1, further comprising:

and the pole component is convexly arranged on the large surface provided with the first insulating layer.

4. The battery cell according to claim 3, wherein the first insulating layer has a first opening that penetrates through two opposite surfaces of the first insulating layer in a thickness direction of the first insulating layer;

at least part of the pole post assembly is exposed on one side surface of the first insulating layer, which faces away from the body, through the first opening.

5. The battery unit according to claim 4, wherein the welding surface of the pole assembly is exposed through the first opening to a side surface of the first insulating layer facing away from the body.

6. The battery cell of claim 1, wherein the first insulating layer is an insulating coating; or a first bonding layer is arranged between the first insulating layer and the large surface.

7. The battery cell of claim 1, wherein the first insulating layer is a thin film structure.

8. The battery cell of claim 1, further comprising a flange structure protruding from the body;

the battery cell also includes a second insulating layer that wraps at least a portion of the flange structure.

9. The battery cell of claim 8, wherein the flange structure has a first surface and a second surface, the first surface being flush with one of the major faces, the second surface being connected to the first surface;

the second insulating layer comprises a first coating portion, and the first coating portion coats the first surface and the second surface.

10. The battery cell of claim 9, wherein the flange structure further has a third surface disposed opposite the first surface and connected to the second surface;

the second insulating layer further comprises a second coating part, and the second coating part is connected to the first coating part and coated on the third surface.

11. The battery cell of claim 8, wherein the first insulating layer and the second insulating layer are a unitary structure.

12. The battery cell of claim 8, wherein the second insulating layer is snapped into engagement with the flange structure.

13. The battery cell of claim 1, wherein the body further has a liquid injection structure disposed on the major face;

the first insulating layer covers the liquid injection structure; or, the first insulating layer has a second opening, the second opening penetrates through two opposite surfaces of the first insulating layer along a thickness direction of the first insulating layer, and at least a part of the liquid injection structure is exposed on a surface of one side of the first insulating layer, which faces away from the body, through the second opening.

14. A battery device, comprising:

a plurality of battery cells according to any one of claims 1 to 13, arranged side by side, the first insulating layer of the battery cell being provided between two adjacent said bodies.

15. The battery device according to claim 14, wherein a side of the first insulating layer facing away from the body is provided with a second adhesive layer, and the adjacent battery cells are connected by the second adhesive layer.

16. The battery device of claim 14, further comprising an insulating assembly coupled to the battery cell;

the insulating component is at least partially overlapped with the first insulating layer along the arrangement direction of the battery units.

17. The battery device of claim 16, wherein the insulating assembly comprises:

an end insulating bracket connected to an end of the battery cell;

the bottom insulating piece is arranged on the bottom surface of the battery unit and is connected with the end insulating bracket; and

and the cover layer is arranged on the top surfaces of the battery units and connected to the end insulating support.

18. The battery device according to claim 17, wherein the cover layer is an insulating film or a cover plate.

19. The battery device of claim 16, further comprising:

and the bottom plate is arranged at the bottoms of the plurality of battery units and is connected to the insulating assembly.

20. The battery device of claim 16, wherein the insulating assembly comprises:

an end insulating bracket connected to an end of the battery cell;

the top insulating part is arranged on the top surface of the battery unit and is connected with the end insulating bracket; and

the bottom insulating part is arranged on the bottom surface of the battery unit and is connected with the end insulating bracket;

the end insulating support, the bottom insulating member, and the bottom insulating member all at least partially overlap the first insulating layer in an arrangement direction of the plurality of battery cells.

21. The battery device of claim 20, wherein the end insulator support is of unitary construction with the bottom insulator; or the like, or, alternatively,

the end insulating support and the top insulating part are of an integral structure; or the like, or, alternatively,

the end insulating support, the top insulating member and the bottom insulating member are of an integral structure.

22. The battery device according to claim 20, wherein the top insulator and/or the bottom insulator are provided with a hollowed-out structure.

23. The battery device according to claim 16, wherein the insulating member is provided with a receiving portion at a position facing the battery cell;

the accommodating portion accommodates at least part of the flange structure in a protruding direction of the flange structure of the battery cell.

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