Battery monomer and electric equipment

Abstract

The utility model relates to the technical field of electric equipment, and discloses a battery monomer and electric equipment. The battery cell comprises a battery cell main body, the battery cell main body is provided with a first end face in a first direction, and a tab is led out from the first end face of the battery cell main body; the cover plate assembly is arranged opposite to the first end face, and the cover plate assembly comprises a cover plate; the insulating film comprises a first coating area, a second coating area, a third coating area and a fourth coating area which are connected in sequence, and the first coating area is located between the cover plate and the first end face; the first coating area and the third coating area are respectively positioned on two sides of the battery cell main body in the first direction; and at least part of the fourth coating area and the second coating area are respectively positioned on the two sides of the battery cell main body in the second direction. According to the single battery, tight insulation protection on the battery cell can be ensured, and the battery cell can be conveniently connected with the cover plate assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a battery cell and electrical equipment. Background Art

[0002] During the production of square batteries, in order to ensure the insulation between the battery cell and the shell, it is usually necessary to coat the battery cell with an insulating film. The insulating film includes two large surface covering portions and an end surface covering portion connecting the two large surface covering portions. The end surface covering portion of the insulating film is located between the cover plate assembly and the battery cell. However, for square batteries with only one battery cell, in order to prevent the cover plate assembly from tilting downward when welding the cover plate assembly to the shell, it is necessary to arrange the connection between the substrate and the flip plate relative to the bent portion of the tab in the thickness direction of the battery cell. In this case, the connection between the substrate and the flip plate will interfere with the connection between the end surface covering portion and the large surface covering portion, thereby affecting the assembly of the flip plate. In other words, the above-mentioned insulating film is not suitable for all battery cells with tabs on the same side, and its scope of use is limited.

[0003] Therefore, there is an urgent need for a battery cell and an electrical device to solve the above technical problems. Utility Model Content

[0004] In view of this, in order to improve at least one of the above-mentioned problems existing in the prior art, the present invention provides a battery cell and an electrical device.

[0005] The first technical solution of the present invention provides a battery cell, comprising:

[0006] A battery cell, comprising a battery cell body, wherein the battery cell body has a first end surface in a first direction, and a tab is extended from the first end surface of the battery cell body;

[0007] a cover plate assembly, disposed opposite to the first end surface, the cover plate assembly comprising a cover plate;

[0008] An insulating film includes a first encapsulating region, a second encapsulating region, a third encapsulating region and a fourth encapsulating region connected in sequence, wherein the first encapsulating region is located between the cover plate and the first end face; the first encapsulating region and the third encapsulating region are respectively located on both sides of the first direction of the battery cell body; at least part of the fourth encapsulating region and the second encapsulating region are respectively located on both sides of the second direction of the battery cell body, wherein the first direction is the height direction of the battery cell body and the second direction is the thickness direction of the battery cell body.

[0009] As an optional solution, the tab has a bent portion, and in the second direction, one end of the first cladding region close to the bent portion is connected to the second cladding region;

[0010] The cover plate assembly further includes an insulating member, which is located between the first end surface and the cover plate; the fourth covering area and the insulating member are detachably connected or hot-melt connected or adhesively connected.

[0011] As an optional solution, the fourth covering area and the second covering area are respectively located on both sides of the second direction of the battery cell body; in the first direction, the end of the fourth covering away from the third covering area and the insulating member are detachably connected or hot-melt connected or adhesively connected.

[0012] As an optional solution, the insulating member includes a substrate and a flip plate, and the substrate and the flip plate can be folded and connected; in the second direction, the connection between the substrate and the flip plate is arranged opposite to the bending portion.

[0013] As an optional solution, the substrate has a first connecting portion, and the flip plate has a second connecting portion, and the first connecting portion and the second connecting portion can be folded and connected, wherein, in the first direction, a first slot is provided on the side of the first connecting portion away from the flip plate, and a second slot is provided on the side of the second connecting portion away from the substrate; the fourth covering area is provided with an opening at a position corresponding to the connection between the substrate and the flip plate; the first connecting portion and the second connecting portion are both inserted into the opening, and the first slot and the second slot are both locked with the edge portion surrounding the opening.

[0014] As an optional solution, the tab further includes an electrical connection portion, and the end of the bent portion away from the battery cell body is connected to the electrical connection portion; the electrical connection portion is located between the substrate and the flip plate, and the substrate and the flip plate are detachably connected.

[0015] As an optional scheme, the insulating part includes a substrate, and the fourth coating area includes a first part, a second part and a third part connected in sequence, the first part and the second coating area are respectively located on both sides of the second direction of the battery cell body, and the first part and the third coating area are connected; the second part and the third part are both located between the first coating area and the first end face; the third part and the substrate are detachably connected or hot-melt connected or adhesively connected.

[0016] As an optional solution, the second part has two connecting segments arranged opposite to each other along the third direction and an avoidance gap formed between the two connecting segments, and both of the two connecting segments are connected to the third part.

[0017] As an optional solution, the insulating member further includes a flip plate, and in the second direction, one end of the flip plate away from the bending portion is flippably connected to the substrate; the flip plate and the substrate are detachably connected.

[0018] The second technical solution of the present invention provides an electrical device including the battery cell.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides a battery cell and electrical equipment, wherein the insulating film includes a first covering area, a second covering area, a third covering area and a fourth covering area which are connected in sequence. The first covering area is first matched with the cover plate assembly, and then after the tab and the cover plate assembly are assembled, the second covering area, the third covering area and the fourth covering area are allowed to cover the battery cell, so that the battery cell and the shell can be insulated. In addition, since the first covering area and the fourth covering area are not connected together, the covering of the insulating film is not affected by the connection between the substrate and the flip plate, that is, the covering of the insulating film and the flipping of the flip plate will not interfere with each other. The insulating film has a wide range of applications and is conducive to the assembly of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the battery cell provided by the first embodiment of the present invention after the shell is hidden;

[0022] Figure 2 yes Figure 1 The main view of the structure in;

[0023] Figure 3 yes Figure 2 AA section view in;

[0024] Figure 4 This is a schematic diagram of the expanded state of the insulating film provided in the first embodiment of the present utility model;

[0025] Figure 5 yes Figure 1 Schematic diagram of the structure during assembly Figure 1

[0026] Figure 6 yes Figure 1 Schematic diagram of the structure during assembly Figure 2 ;

[0027] Figure 7 yes Figure 1 Schematic diagram of the structure during assembly Figure 3 ;

[0028] Figure 8 yes Figure 1 Schematic diagram of the structure during assembly Figure 4 ;

[0029] Figure 9 This is a schematic structural diagram of a battery cell provided by the second embodiment of the present invention after its housing is hidden;

[0030] Figure 10 yes Figure 9 A side view of the structure in FIG.

[0031] Figure 11 yes Figure 9 The main view of the structure in;

[0032] Figure 12 yes Figure 11 BB cross-section view in.

[0033] Figure 13 This is a schematic diagram of the expanded state of the insulating film provided in the second embodiment of the present utility model;

[0034] Figure 14 yes Figure 9 Schematic diagram of the structure during assembly Figure 1

[0035] Figure 15 yes Figure 9 Schematic diagram of the structure during assembly Figure 2 ;

[0036] Figure 16 yes Figure 9 Schematic diagram of the structure during assembly Figure 3 ;

[0037] In the picture:

[0038] 10. Cell; 11. Cell body; 111. First end face; 112. First large face; 113. Second large face; 114. Second end face; 12. Tab; 121. Bend portion; 122. Electrical connection portion; 13. Connecting piece; 20. Cover assembly; 21. Cover; 211. Liquid injection hole; 22. Insulator; 221. Base plate; 2211. First connection portion; 2212. First slot; 222. Flip plate; 2221. Second connection portion; 2222. Second slot; 223, locking portion; 224, lock; 23, pole assembly; 24, explosion-proof structure; 30, insulating film; 31, first covering area; 311, first positioning hole; 312, first avoidance hole; 313, second avoidance hole; 32, second covering area; 33, third covering area; 34, fourth covering area; 341, opening; 342, first part; 343, second part; 344, third part; 345, avoidance gap; 346, second positioning hole. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0040] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0043] Example 1

[0044] like Figure 1-Figure 3As shown, this embodiment provides a battery cell, which is a square battery. Specifically, the battery cell includes a shell (not shown in the figure), a battery cell 10 and a cover assembly 20. The shell is constructed as a rectangular parallelepiped, and one side is open. The battery cell 10 can be loaded into the shell from the open side. The battery cell 10 includes a battery cell body 11 and two tabs 12. The polarities of the two tabs 12 are opposite. The two tabs 12 are led out from the first end face 111 of the battery cell body 11, and the two tabs 12 are spaced apart along the third direction. The battery cell body 11 has a first end face 111 and a second end face 114 arranged opposite to each other along the first direction, and also has a first large face 112 and a second large face 113 arranged opposite to each other along the second direction, wherein the first direction is the height direction of the battery cell body 11, the second direction is the thickness direction of the battery cell body 11, and the third direction is the width direction of the battery cell body 11. The first direction and the second direction are perpendicular to each other, and the third direction is perpendicular to the first direction and the second direction respectively.

[0045] like Figure 1-Figure 3 As shown, the cover assembly 20 is covered on the opening of the shell and forms a closed space with the shell; the cover assembly 20 includes a cover 21 and two pole assemblies 23 with opposite polarities, the cover 21 is arranged opposite to the first end face 111 of the battery body 11, and the two pole assemblies 23 are arranged on the cover 21 at intervals along the third direction, and the two pole assemblies 23 are respectively electrically connected to the pole ears 12 corresponding to their polarities, so as to facilitate the connection between the battery cell 10 and external electrical appliances.

[0046] like Figure 1-Figure 3 As shown, the cover plate 21 is provided with an explosion-proof structure 24. This structure is designed to rupture and release pressure when the internal pressure of the battery cell exceeds a preset value, preventing the battery cell from exploding and ensuring the safety of the battery cell. The explosion-proof structure 24 can be any of the conventional methods and is not specifically limited here. The cover plate 21 is also provided with an injection hole 211 for injecting electrolyte into the battery cell. Once the electrolyte is injected, the battery cell is sealed with a seal.

[0047] like Figure 1-Figure 3 As shown, the battery cell further includes a connecting piece 13, and the tab 12 includes a gathering portion connected to the battery cell body 11, a bent portion 121 connected to the gathering portion, and an electrical connection portion 122 connected to the bent portion 121. One end of the connecting piece 13 is connected to the electrical connection portion 122 of the tab 12, and the other end of the connecting piece 13 is connected to the pole assembly 23 with the same polarity. By providing the connecting piece 13, the electrical connection between the tab 12 and the pole assembly 23 is achieved.

[0048] like Figure 1-Figure 3 and Figure 4-Figure 8As shown, the battery cell also includes an insulating film 30, which includes a first encapsulating area 31, a second encapsulating area 32, a third encapsulating area 33 and a fourth encapsulating area 34 connected in sequence. The first encapsulating area 31 is located between the cover plate 21 and the first end face 111. The first encapsulating area 31 and the third encapsulating area 33 are respectively located on both sides of the first direction of the battery cell body 11 to respectively encapsulate the first end face 111 and the second end face 114; at least parts of the second encapsulating area 32 and the fourth encapsulating area 34 are respectively located on both sides of the second direction of the battery cell body 11 to respectively encapsulate the first large face 112 and the second large face 113.

[0049] In the battery cell of this embodiment, since the first coating area 31, the second coating area 32, the third coating area 33 and the fourth coating area 34 of the insulating film 30 are connected in sequence, when the insulating film 30 and the battery cell 10 are assembled, the first coating area 31 can be matched with the cover assembly 20 first, and then the tab 12 of the battery cell 10 and the cover assembly 20 can be assembled. Finally, the second coating area 32, the third coating area 33 and the fourth coating area 34 can sequentially cover the first large surface 112, the second end surface 114 and the second large surface 113 of the battery cell 10, so that the battery cell 10 and the shell can be insulated.

[0050] It should be noted that if Figure 4 and Figure 5 As shown, two first avoidance holes 312 and one second avoidance hole 313 are provided on the first covering area 31 of the insulating film 30. The two first avoidance holes 312 are respectively used to avoid the two pole assemblies 23 to ensure that the pole assemblies 23 can be connected to the corresponding pole ears 12; the second avoidance hole 313 is used to avoid the explosion-proof structure 24, thereby ensuring that the explosion-proof structure 24 can smoothly release pressure after rupture.

[0051] like Figures 1-8 As shown, the cover plate assembly 20 also includes an insulating member 22, and the insulating member 22 and the first coating area 31 are both located between the first end face 111 of the battery cell body 11 and the cover plate 21, and the insulating member 22 is connected to the cover plate 21; in the second direction, the first coating area 31 of the insulating film 30 is connected to the second coating area 32 at one end near the bending portion 121, and the fourth coating area 34 of the insulating film 30 is detachably connected to the insulating member 22 or hot-melt connected or adhesively connected.

[0052] In this embodiment, after the first coating region 31 of the insulating film 30 is placed between the first end surface 111 of the battery cell body 11 and the cover plate 21, and the second coating region 32, the third coating region 33, and the fourth coating region 34 of the insulating film 30 sequentially coat the first large surface 112, the second end surface 114, and the second large surface 113 of the battery cell 10, the fourth coating region 34 of the insulating film 30 is fixed to the insulating member 22 by designing a detachable connection, a hot melt connection, or an adhesive connection. Of course, the fourth coating region 34 of the insulating film 30 can also be fixed to the battery cell 10 by connecting it with tape.

[0053] It should be noted that the detachable connection between the fourth covering area 34 of the insulating film 30 and the insulating member 22 may be achieved through a snap connection or a tape connection.

[0054] In some embodiments, as Figures 1-8 As shown, the fourth coating area 34 and the second coating area 32 are respectively located on both sides of the battery cell body 11 in the second direction; in the first direction, the end of the fourth coating area 34 away from the third coating area 33 is detachably connected to the insulating member 22 or hot-melt connected or adhesively connected.

[0055] In this embodiment, see Figure 5-Figure 8 First, place the first coating area 31 of the insulating film 30 between the first end surface 111 of the battery cell body 11 and the cover plate 21, then assemble the tab 12 of the battery cell 10 and the cover plate assembly 20, and then bend the tab 12 of the battery cell 10 so that the cover plate assembly 20 is placed on the first end surface 111 of the battery cell body 11, and then let the second coating area 32, the third coating area 33 and the fourth coating area 34 of the insulating film 30 successively cover the first large surface 112, the second end surface 114 and the second large surface 113 of the battery cell 10, and finally connect the fourth coating area 34 of the insulating film 30 to the insulating member 22 to achieve the coating and fixation of the insulating film 30.

[0056] Furthermore, the insulating member 22 includes a substrate 221 and a flip plate 222, which can be flipped and connected, and in the second direction, the connection between the substrate 221 and the flip plate 222 is arranged opposite to the bending portion 121, wherein the first coating area 31 of the insulating film 30 is located between the cover plate 21 and the substrate 221, or the first coating area 31 of the insulating film 30 is located between the substrate 221 and the connecting piece 13.

[0057] In this embodiment, since the connection between the substrate 221 and the flip plate 222 is arranged opposite to the bending portion 121 in the second direction, the connection between the substrate 221 and the flip plate 222 can abut against the first end surface 111 of the battery cell body 11, that is, the connection between the substrate 221 and the flip plate 222 can support the cover plate 21, thereby preventing the cover plate 21 from tilting downward when the cover plate 21 and the shell are welded, thereby improving the overall assembly efficiency of the battery cell; and since the fourth coating area 34 of the insulating film 30 is not connected to the first coating area 31, the coating of the insulating film 30 is not affected by the connection between the substrate 221 and the flip plate 222, that is, the coating of the insulating film 30 and the flipping of the flip plate 222 will not interfere with each other. The insulating film 30 has a wide range of applications and is conducive to the assembly of battery cells.

[0058] In addition, since the fourth coating area 34 and the second coating area 32 are respectively located on both sides of the battery body 11 in the second direction, and in the first direction, the end of the fourth coating area 34 away from the third coating area 33 and the insulating member 22 can be detachably connected or hot-melt connected or adhesively connected, therefore, see Figure 3 As shown, after the fourth coating region 34 of the insulating film 30 is connected to the insulating member 22 , the fourth coating region 34 pulls the cover plate assembly 20 , thereby preventing the cover plate assembly 20 from warping due to the bent portion 121 of the tab 12 .

[0059] It should be noted that the insulating member 22 is made of a plastic material, and the base plate 221 and the flip plate 222 can be integrally injection-molded. In this case, a fold is formed between the base plate 221 and the flip plate 222, that is, the flip plate 222 flips around the fold. Of course, the base plate 221 and the flip plate 222 can also be configured as separate structures, which is not specifically limited here.

[0060] It should also be noted that if Figure 5 As shown, the insulating member 22 includes two flip plates 222, which are spaced apart along the third direction. The flip plates 222 and the tabs 12 are in a one-to-one correspondence. The space between the two flip plates 222 forms a clearance for the explosion-proof structure 24. One of the two flip plates 222 is opposite the injection hole 211. To ensure smooth injection, an opening can be provided on the flip plate 222 to ensure smooth injection. Of course, a single flip plate 222 can also be provided. In this solution, a hole can be opened at the corresponding position of the flip plate 222 to avoid the explosion-proof structure 24 and the injection hole 211.

[0061] Furthermore, in order to avoid the situation where only the connection between the substrate 221 and the flip plate 222 abuts against the first end surface 111 of the battery cell body 11 and damages the battery cell body 11, the flip plate 222 is designed to abut against the first end surface 111 of the battery cell body 11, thereby increasing the contact area and reducing the damage to the battery cell body 11 caused by the insulating member 22 abutting against the first end surface 111 of the battery cell body 11.

[0062] Furthermore, in order to prevent the cover plate assembly 20 from warping due to the bent portion 121 of the tab 12, in the second direction, the fourth coating area 34 and the substrate 221 of the insulating member 22 can be connected, that is, the connection between the fourth coating area 34 and the substrate 221 is arranged relative to the bent portion 121 of the tab 12, or the fourth coating area 34 and the flip plate 222 of the insulating member 22 are connected, that is, the connection between the fourth coating area 34 and the flip plate 222 is arranged relative to the bent portion 121 of the tab 12. Of course, it is also possible, see Figure 3 and Figure 5-Figure 8 , so that the connection between the substrate 221 and the flip plate 222 is connected to the fourth cladding area 34.

[0063] Specifically, the substrate 221 has a first connecting portion 2211, and the flip plate 222 has a second connecting portion 2221. The first connecting portion 2211 and the second connecting portion 2221 can be folded and connected, wherein, in the first direction, a first slot 2212 is provided on the side of the first connecting portion 2211 away from the second connecting portion 2221, and a second slot 2222 is provided on the side of the second connecting portion 2221 away from the substrate 221; the fourth covering area 34 is provided with an opening 341 at a position corresponding to the connection between the substrate 221 and the flip plate 222; the first connecting portion 2211 and the second connecting portion 2221 are both inserted into the opening 341, and the first slot 2212 and the second slot 2222 are both locked with the edge portion surrounding the opening 341.

[0064] In this embodiment, the first connection portion 2211 of the substrate 221 and the second connection portion 2221 of the flip plate 222 are both inserted into the opening 341, and the first slot 2212 and the second slot 2222 are both locked with the edge portion surrounding the opening 341. On the one hand, the connection between the substrate 221 and the flip plate 222 is locked with the fourth covering area 34. On the other hand, the opening 341 of the fourth covering area 34 limits the relative flipping of the first connection portion 2211 and the second connection portion 2221, that is, limits the relative flipping of the substrate 221 and the flip plate 222, so that the substrate 221 and the flip plate 222 are locked.

[0065] It should be noted that, in order to facilitate the insertion of the first connection part 2211 and the second connection part 2221 into the opening 341 of the fourth covering area 34, in the first direction, the side surface of the first connection part 2211 away from the second connection part 2221 and the side surface of the second connection part 2221 away from the substrate 221 are both inclined surfaces.

[0066] In some embodiments, in order to prevent welding slag from falling into the housing at the connection between the tab 12 and the connecting piece 13 of the battery cell 10 , the electrical connection portion 122 of the tab 12 is designed to be located between the base plate 221 and the flip plate 222 .

[0067] In this embodiment, the flip plate 222 covers the connection between the electrical connection portion 122 of the tab 12 and the connecting piece 13, which can prevent the welding slag at the connection between the tab 12 and the connecting piece 13 of the battery cell 10 from falling into the shell. In addition, since the tab 12 is bent around the flip plate 222, it can prevent the tab 12 from being partially inserted into the battery cell 10.

[0068] Furthermore, in order to lock the relative positions of the flip plate 222 and the substrate 221 after the flip plate 222 is flipped to between the substrate 221 and the battery cell 10 , the substrate 221 and the flip plate 222 are detachably connected.

[0069] Specifically, if Figure 5 As shown, a locking portion 223 is provided on one of the sides of the base plate 221 facing the flip plate 222 and a locking catch 224 is provided on the other side of the flip plate 222 facing the base plate 221. The locking catch 224 engages with the locking portion 223 in a snap-fit ​​manner. This snap-fit ​​arrangement is simple to operate, thereby improving the assembly efficiency of the battery cells. In this embodiment, the locking portion 223 is provided on the base plate 221 and is configured as a cylindrical structure having a stepped hole. The locking catch 224 is provided on the flip plate 222 and has at least one elastically deformable hook. The hook of the locking catch 224 extends from the small hole section of the stepped hole into the large hole section of the stepped hole, and the hook of the locking catch 224 abuts against the stepped surface of the stepped hole, thereby connecting the base plate 221 to the flip plate 222. Optionally, multiple corresponding sets of locking catches 224 and locking portions 223 can be provided to improve the reliability of the connection between the flip plate 222 and the base plate 221. In this embodiment, two lock buckles 224 are correspondingly provided at each flip plate 222. In other embodiments, the number of lock buckles 224 can be flexibly set. In some embodiments, the lock buckles 224, the locking portion 223 and the entire insulating member 22 are integrally injection molded.

[0070] Furthermore, if Figure 4 and Figure 5As shown, since the first encapsulating region 31 of the insulating film 30 is located between the substrate 221 and the connecting piece 13, a first positioning hole 311 is provided in the first encapsulating region 31 of the insulating film 30. The first positioning hole 311 is sleeved over the locking portion 223 or the locking catch 224. During battery cell assembly, the engagement of the locking portion 223 or the locking catch 224 with the first positioning hole 311 can position the first encapsulating region 31, thereby improving assembly efficiency. Furthermore, after the locking portion 223 and the locking catch 224 engage, they also limit the first encapsulating region 31 of the insulating film 30, preventing it from shifting and ensuring reliable insulation of the battery cell.

[0071] The assembly process of the battery cell of this embodiment is as follows:

[0072] First, if Figure 5 As shown, the insulating film 30 is in an unfolded and flat state, and the flip plate 222 is in a flat state. At this time, the first coating area 31 of the insulating film 30 is placed between the substrate 221 and the connecting piece 13, and the first positioning hole 311 of the first coating area 31 is sleeved outside the locking portion 223 or the lock buckle 224. The battery cell 10 is placed in the second coating area 32, and the tab 12 of the battery cell 10 is connected to the pole assembly 23 through the connecting piece 13;

[0073] Afterwards, if Figure 6 As shown, the flip plate 222 and the base plate 221 are flipped relative to each other, the flip plate 222 covers the electrical connection portion 122 of the tab 12, and the flip plate 222 and the base plate 221 are connected, so that the flip plate 222 and the base plate 221 are locked with each other;

[0074] Then, if Figure 7 As shown, the third covering region 33 of the insulating film 30 is flipped relative to the second covering region 32 of the insulating film 30 so that the third covering region 33 of the insulating film 30 covers the second end surface 114 of the battery cell 10; and the tab 12 is bent so that the cover assembly 20 is placed on the first end surface 111 of the battery cell body 11;

[0075] Then, if Figure 8 As shown, the fourth covering area 34 of the insulating film 30 is flipped relative to the third covering area 33 of the insulating film 30, so that the fourth covering area 34 of the insulating film 30 covers the second large surface 113 of the battery cell 10; and the first connecting portion 2211 and the second connecting portion 2221 are inserted into the opening 341 of the fourth covering area 34, and the first slot 2212 and the second slot 2222 are both locked with the edge portion surrounding the opening 341, thereby forming the following Figure 1 The status shown.

[0076] This embodiment also provides an electrical device, which includes the above-mentioned battery cell. By arranging the above-mentioned battery cell, the electrical device is easy to assemble and has good safety.

[0077] Example 2

[0078] This embodiment provides a battery cell. The structures of the battery cell 10 and the cover plate assembly 20 of the battery cell in this embodiment are the same as those in the first embodiment. The similarities are not repeated here. The difference mainly lies in the matching method between the fourth covering area 34 and the insulating member 22, which is specifically as follows:

[0079] like Figures 9-13 As shown, in this embodiment, the insulating film 30 also includes a first encapsulating region 31, a second encapsulating region 32, a third encapsulating region 33, and a fourth encapsulating region 34 connected in sequence. The first encapsulating region 31 and the third encapsulating region 33 are respectively located on both sides of the battery cell body 11 in the first direction, respectively facing the first end face 111 and the second end face 114. The second encapsulating region 32 and a portion of the fourth encapsulating region 34 are respectively located on both sides of the battery cell body 11 in the second direction, respectively facing the first large face 112 and the second large face 113.

[0080] Specifically, the fourth encapsulating region 34 includes a first portion 342, a second portion 343, and a third portion 344, with the first portion 342 and the third encapsulating region 33 connected. The second encapsulating region 32 and the first portion 342 are located on either side of the cell body 11 in the second direction, respectively, to face the first large surface 112 and the second large surface 113. The second portion 343 and the third portion 344 are both located between the first encapsulating region 31 and the first end surface 111. The third portion 344 and the substrate 221 can be detachably connected, thermally melted, or adhesively bonded.

[0081] In this embodiment, the second part 343 covers the first end face 111 of the battery cell body 11, which can prevent impurities such as welding slag from entering the battery cell body 11 from the first end face 111; the third part 344 and the substrate 221 can be detachably connected or hot-melt connected or adhesively connected, thereby fixing the insulating film 30.

[0082] It should also be noted that the third part 344 and the second part 343 here can be a diaphragm structure with the same size as the first coating area 31 in the third direction. However, in order to avoid the explosion-proof structure 24 and the injection hole 211, it is necessary to process the avoidance structure on the third part 344 and the second part 343.

[0083] Specifically, see Figure 13 and Figure 15 The second portion 343 has two connecting segments arranged opposite to each other along the third direction and an avoidance gap 345 formed between the two connecting segments, and both connecting segments are connected to the third portion 344.

[0084] Furthermore, in order to ensure that the third portion 344 is connected to the substrate 221, it is not necessary to add other components or processes to fix the insulating film 30, thereby improving the production efficiency of the battery cell. Figure 14 and Figure 15 As shown, the third portion 344 is provided with a second positioning hole 346 at a position corresponding to the lock catch 224 or the locking portion 223. The second positioning hole 346 is sleeved on the locking portion 223 or the lock catch 224. When the flip plate 222 and the base plate 221 are locked together via the lock catch 224 and the locking portion 223, the third portion 344 of the insulating film 30 is fixed to the base plate 221. This not only ensures the reliability of the position of the insulating film 30, but also eliminates the need for additional processes (such as applying glue), thereby further improving the assembly efficiency of the battery cells.

[0085] The assembly process of the battery cell of this embodiment is as follows:

[0086] First, if Figure 14 As shown, the insulating film 30 is in an unfolded and flat state, and the flip plate 222 is in a flat state. At this time, the first coating area 31 of the insulating film 30 is placed between the substrate 221 and the connecting piece 13, the battery cell 10 is placed in the second coating area 32, and the tab 12 of the battery cell 10 is connected to the pole assembly 23 through the connecting piece 13;

[0087] Then, if Figure 15 As shown, the third covering region 33 of the insulating film 30 is flipped relative to the second covering region 32 of the insulating film 30, so that the third covering region 33 of the insulating film 30 covers the second end surface 114 of the battery cell body 11. The first portion 342 of the insulating film 30 is flipped relative to the third covering region 33 of the insulating film 30, so that the first portion 342 of the insulating film 30 covers the second large surface 113 of the battery cell body 11. The second portion 343 of the insulating film 30 is flipped relative to the first portion 342 of the insulating film 30, so that the second portion 343 of the insulating film 30 covers the first end surface 111 of the battery cell body 11. The third portion 344 of the insulating film 30 is flipped relative to the second portion 343 of the insulating film 30, so that the third portion 344 of the insulating film 30 is placed on the substrate 221 of the insulating member 22, and the second positioning hole 346 of the third portion 344 is sleeved outside the lock buckle 224 or the locking portion 223.

[0088] Then, if Figure 16 As shown, the flip plate 222 is folded toward the base plate 221 and engaged with the base plate 221, and finally the cover plate assembly 20, the first coating area 31 and the third portion 344 are synchronously flipped toward the first end surface 111, thereby forming Figure 9 The status shown.

[0089] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will, based on the concept of the present invention, vary the specific implementation methods and scope of application, and the contents of this specification should not be construed as limiting the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell, characterized in that: include: A battery cell (10) comprises a battery cell body (11), wherein the battery cell body (11) has a first end surface (111) in a first direction; and a tab (12) is extended from the first end surface (111) of the battery cell body (11); a cover plate assembly (20) disposed opposite to the first end surface (111), the cover plate assembly (20) comprising a cover plate (21); An insulating film (30) comprises a first encapsulating region (31), a second encapsulating region (32), a third encapsulating region (33) and a fourth encapsulating region (34) connected in sequence, wherein the first encapsulating region (31) and the third encapsulating region (33) are respectively located on both sides of a first direction of the battery cell body (11), wherein the first encapsulating region (31) is located between the cover plate (21) and the first end face (111); at least a portion of the fourth encapsulating region (34) and the second encapsulating region (32) are respectively located on both sides of a second direction of the battery cell body (11), wherein the first direction is a height direction of the battery cell body (11), and the second direction is a thickness direction of the battery cell body (11).

2. The battery cell according to claim 1, wherein The tab (12) has a bent portion (121), and in the second direction, one end of the first cladding region (31) close to the bent portion (121) is connected to the second cladding region (32); The cover plate assembly (20) further comprises an insulating member (22), wherein the insulating member (22) is located between the first end surface (111) and the cover plate (21); the fourth covering area (34) and the insulating member (22) are detachably connected or hot-melt connected or adhesively connected.

3. The battery cell according to claim 2, wherein: The fourth coating region (34) and the second coating region (32) are respectively located on both sides of the battery cell body (11) in the second direction; in the first direction, one end of the fourth coating region (34) away from the third coating region (33) is detachably connected to the insulating member (22) or is connected by hot melting or adhesive bonding.

4. The battery cell according to claim 3, wherein: The insulating member (22) comprises a base plate (221) and a flip plate (222), and the base plate (221) and the flip plate (222) can be folded and connected; in the second direction, the connection between the base plate (221) and the flip plate (222) is arranged opposite to the bending portion (121).

5. The battery cell according to claim 4, wherein: The base plate (221) has a first connecting portion (2211), and the flip plate (222) has a second connecting portion (2221). The first connecting portion (2211) and the second connecting portion (2221) can be folded and connected. In a first direction, a first slot (2212) is provided on a side of the first connecting portion (2211) away from the second connecting portion (2221), and a second slot (2222) is provided on a side of the second connecting portion (2221) away from the base plate (221). The fourth covering area (34) is provided with an opening (341) at a position corresponding to the connection between the base plate (221) and the flip plate (222); the first connecting portion (2211) and the second connecting portion (2221) are both inserted into the opening (341), and the first slot (2212) and the second slot (2222) are both engaged with the edge portion surrounding the opening (341).

6. The battery cell according to claim 4 or 5, characterized in that: The tab (12) further comprises an electrical connection portion (122), and one end of the bent portion (121) away from the battery cell body (11) is connected to the electrical connection portion (122); the electrical connection portion (122) is located between the substrate (221) and the flip plate (222), and the substrate (221) and the flip plate (222) are detachably connected.

7. The battery cell according to claim 2, wherein: The insulating member (22) includes a substrate (221); the fourth coating region (34) includes a first portion (342), a second portion (343) and a third portion (344) connected in sequence; the first portion (342) and the second coating region (32) are respectively located on both sides of the second direction of the battery cell body (11), and the first portion (342) and the third coating region (33) are connected; the second portion (343) and the third portion (344) are both located between the first coating region (31) and the first end face (111); and the third portion (344) and the substrate (221) are detachably connected or hot-melt connected or adhesively connected.

8. The battery cell according to claim 7, wherein: The second part (343) has two connecting sections arranged opposite to each other along a third direction and an avoidance gap (345) formed between the two connecting sections, and both of the two connecting sections are connected to the third part (344).

9. The battery cell according to claim 7, wherein: The insulating member (22) further comprises a flip plate (222), wherein in the second direction, one end of the flip plate (222) away from the bending portion (121) and the base plate (221) can be flipped and connected; and the flip plate (222) and the base plate (221) can be detachably connected.

10. An electrical device comprising the battery cell according to any one of claims 1 to 9.

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