A battery packaging structure, a battery packaging method, a battery, and an electric device

Abstract

The application relates to the technical field of batteries, and discloses a battery packaging structure, a battery packaging method, a battery and an electric device. The battery packaging structure comprises a sleeve body, the sleeve body is an integrated structure formed after a rectangular film body is folded and plastic sealed, and the sleeve body has a sealed placement cavity for placing a battery cell; the sleeve body comprises a top sealing area, a main sealing area and a bottom sealing area arranged in sequence, the top sealing area comprises a top sealing transition area and a top sealing closing area, the top sealing transition area is located between the main sealing area and the top sealing closing area and points to the direction of the top sealing closing area along the main sealing area, and the size of the top sealing transition area gradually decreases. The battery packaging structure can effectively wrap battery cells of various sizes to form a battery meeting the requirements of width, thickness and length.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery packaging structure, a battery packaging method, a battery and an electric device. BACKGROUND

[0002] Based on the continuous development of the demand for batteries, the capacity and energy density of single battery are required to be higher and higher, which requires the battery to be larger and larger. Due to the limited punching performance of the aluminum plastic film, the thickness of the battery cannot be broken through, and finally the size of the battery can only be extended in length and width, which is limited in size. SUMMARY

[0003] The present application provides a battery packaging structure, a battery packaging method, a battery and an electric device, which can effectively wrap the battery of various sizes to form a battery meeting the requirements of width, thickness and length.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] According to a first aspect of the present application, a battery packaging structure is provided, comprising: a sleeve body, the sleeve body is an integrated structure formed by folding and plastic packaging a rectangular film body, the sleeve body has a sealed placement cavity for placing a battery cell; the sleeve body comprises a top sealing area, a main sealing area and a bottom sealing area arranged in sequence, the top sealing area comprises a top sealing transition area and a top sealing closing area, the top sealing transition area is located between the main sealing area and the top sealing closing area, and points to the direction of the top sealing closing area along the main sealing area, and the size of the top sealing transition area gradually decreases.

[0006] The battery packaging structure provided by the present application can form a sleeve body suitable for different size battery cells. Specifically, the sleeve body can wrap various length, width and thickness battery cells to ensure the protection effect of the battery cell. At the same time, the battery packaging structure provided by the present application changes the original packaging method, cancels the aluminum plastic film punching, and solves the problem that the thickness direction cannot be broken through due to the characteristics of the aluminum plastic film. The sleeve body with the integrated structure can manufacture a battery with thicker thickness. Moreover, the battery packaging structure provided by the present application reduces the folding step compared with the conventional battery packaging structure, and can improve the volume utilization rate.

[0007] According to a second aspect of the present application, a battery packaging method is provided, comprising:

[0008] Forming a rectangular film body according to the size of the battery cell;

[0009] The rectangular film body is bent and plastic-wrapped to form a sleeve body, the sleeve body is a one-piece structure, and the battery cell is placed in a sealed placement cavity of the sleeve body; the sleeve body comprises a top sealing area, a main sealing area and a bottom sealing area arranged in sequence, the top sealing area comprises a top sealing transition area and a top sealing closing area, the top sealing transition area is located between the main sealing area and the top sealing closing area and points to the direction of the top sealing closing area along the main sealing area, and the size of the top sealing transition area gradually decreases.

[0010] The battery packaging method provided by the application can be adapted to different sizes of battery cells, specifically, the sleeve body can be used to wrap various lengths, widths and thicknesses of battery cells to ensure the protection effect on the battery cells. At the same time, the battery packaging method provided by the application changes the original packaging method, cancels the aluminum plastic film punching pit, solves the problem that the thickness direction cannot be broken due to the characteristics of the aluminum plastic film itself, and uses the sleeve body of the one-piece structure to manufacture a battery with a thicker thickness. Moreover, the battery packaging method provided by the application reduces the edge folding step compared with the conventional battery packaging method, and can improve the volume utilization rate.

[0011] According to a third aspect of the application, a battery is provided, comprising the battery packaging structure provided by any of the technical solutions in the first aspect.

[0012] In the battery provided by the application, the battery packaging structure can form a sleeve body adapted to different sizes of battery cells, specifically, the sleeve body can be used to wrap various lengths, widths and thicknesses of battery cells to ensure the protection effect on the battery cells. At the same time, the battery packaging structure changes the original packaging method, cancels the aluminum plastic film punching pit, solves the problem that the thickness direction cannot be broken due to the characteristics of the aluminum plastic film itself, and uses the sleeve body of the one-piece structure to manufacture a battery with a thicker thickness. Moreover, the battery packaging structure reduces the edge folding step compared with the conventional battery packaging structure, and can improve the volume utilization rate.

[0013] According to a fourth aspect of the application, an electric device is provided, comprising the battery provided by any of the technical solutions in the third aspect.

[0014] In the electric device provided by the application, the battery packaging structure in the battery can form a sleeve body adapted to different sizes of battery cells, specifically, the sleeve body can be used to wrap various lengths, widths and thicknesses of battery cells to ensure the protection effect on the battery cells. At the same time, the battery packaging structure changes the original packaging method, cancels the aluminum plastic film punching pit, solves the problem that the thickness direction cannot be broken due to the characteristics of the aluminum plastic film itself, and uses the sleeve body of the one-piece structure to manufacture a battery with a thicker thickness. Moreover, the battery packaging structure reduces the edge folding step compared with the conventional battery packaging structure, and can improve the volume utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0015] For better understanding of the present application, reference can be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements can be omitted in order to emphasize and clarify the technical features of the present application. In addition, related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components throughout the various drawings. Among them:

[0016] Figure 1 Structural schematic diagram of a battery packaging structure provided for an embodiment of the present application;

[0017] Figure 2 Structural schematic diagram of a battery packaging structure provided for an embodiment of the present application from another angle;

[0018] Figure 3 Enlarged schematic diagram of a part of the structure; Figure 1

[0019] Figure 4 Unfolded schematic diagram of a battery packaging structure provided for an embodiment of the present application;

[0020] Figure 5 Enlarged structural schematic diagram of a part of the structure; Figure 4

[0021] Figure 6 Flowchart of a battery packaging method provided for an embodiment of the present application;

[0022] Figure 7 , Figure 8 , Figures 9 to 10 Packaging process schematic diagram of a battery packaging method provided for an embodiment of the present application.

[0023] The reference numerals are explained as follows:

[0024] 100, sleeve; 110, top sealing area; 111, top sealing closing area; 112, top sealing transition area; 120, main sealing area; 130, bottom sealing area; 200, battery cell; 300, adapter; 310, main body part; 320, adhesive part; 321, first adhesive area; 322, second adhesive area; L1, straight line segment; L2, V-shaped segment; h1, first transverse separation line; h2, second transverse separation line; s1, first longitudinal separation line; s2, second longitudinal separation line; s3, third longitudinal separation line; s4, fourth longitudinal separation line. DETAILED DESCRIPTION

[0025] ​​With reference to the accompanying drawings, the technical solutions in the example embodiments of the present application will be clearly and completely described in the present application. The example embodiments described in the present application are only for illustrative purposes, and are not intended to limit the protection scope of the present application. Therefore, it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present application.

[0026] In the description of the present application, unless explicitly specified and limited, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two; the term "and / or" includes any combination and all combinations of one or more associated listed items. In particular, referring to "the" object or "one" object is also intended to represent one of the possible multiple such objects.

[0027] Unless otherwise specified or explained, the terms "connection", "fixation" and the like should be broadly understood, for example, "connection" can be fixed connection, or detachable connection, or integral connection, or electrical connection, or signal connection; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Further, in the description of the present application, it should be understood that the "up", "down", "inner", "outer" and the like described in the example embodiments of the present application are described from the angle shown in the drawings, and should not be understood as limiting the example embodiments of the present application. It should also be understood that in the context, when referring to an element or feature connected to another element (one or more) "on", "below", or "inside", "outside", it can not only be directly connected to another element (one or more) "on", "below", or "inside", "outside", but also indirectly connected to another element (one or more) "on", "below", or "inside", "outside" through an intermediate element.

[0029] In a first aspect, the example embodiments of the present application provide a battery packaging structure. Figure 1 A structural schematic diagram of the battery packaging structure provided by the example embodiments of the present application is shown in the following figure: Figure 2 A structural schematic diagram of the battery packaging structure provided by the example embodiments of the present application is shown in the following figure: Figure 1 And Figure 2As shown in the structure, the battery packaging structure provided by the embodiment of the present application comprises: a sleeve body 100, which is an integrated structure formed by folding and plastic packaging a rectangular film body, and has a sealed placement cavity for placing a battery cell 200; the sleeve body 100 comprises a top sealing area 110, a main sealing area 120 and a bottom sealing area 130 arranged in sequence, the top sealing area 110 comprises a top sealing transition area 112 and a top sealing closing area 111, the top sealing transition area 112 is located between the main sealing area 120 and the top sealing closing area 111 and points to the direction of the top sealing closing area 111 along the main sealing area 120, and the size of the top sealing transition area 112 gradually decreases. It should be understood that Figure 1 The sleeve body 100 is shown in a partially open form.

[0030] Specifically, the top sealing area 110, the main sealing area 120 and the bottom sealing area 130 in the sleeve body 100 cooperate with each other to form an effective sealed placement cavity, and at the same time, the battery cell 200 can be placed in the sealed placement cavity of the sleeve body 100 to effectively protect the battery cell 200; the top sealing area 110 comprises the top sealing transition area 112 and the top sealing closing area 111, and the size of the top sealing transition area 112 gradually decreases, so that the size of the main sealing area 120 to the top sealing closing area 111 gradually decreases, which can improve the fitting degree of the sleeve body 100 and the battery cell 200 on one hand, and improve the sealing effect at the top sealing closing area 111 on the other hand.

[0031] It should be understood that the sleeve body 100 is an integrated structure formed by folding and plastic packaging a rectangular film body, and specifically, rectangular film bodies of different sizes can be cut according to the size of the battery cell 200, and then the rectangular film bodies are folded and the integrated structure is formed according to the size of the battery cell 200.

[0032] It should be noted that the battery packaging structure provided by the embodiment of the present application can form a sleeve body 100 suitable for battery cells 200 of different sizes, and specifically, the sleeve body 100 can perform wrapping operation on battery cells 200 of various lengths, widths and thicknesses to ensure the protection effect of the battery cell 200.

[0033] At the same time, it is worth noting that the battery packaging structure provided by the embodiment of the present application changes the original packaging method, cancels the aluminum plastic film pit, and solves the problem that the thickness direction cannot be broken through due to the characteristics of the aluminum plastic film itself, and the sleeve body 100 with the integrated structure can manufacture a battery with a thicker thickness; moreover, the battery packaging structure provided by the embodiment of the present application reduces the folding step compared with the conventional battery packaging structure, and can improve the volume utilization rate.

[0034] In one embodiment, the top sealing closing area 111 has an open state (exemplarily shown as Figure 3 and a closed state, wherein:

[0035] When the top closure closing area 111 is in the open state, the top closure closing area 111 comprises two oppositely arranged straight line segments L1 and two oppositely arranged V-shaped segments L2, the sharp corners of the V-shaped segments L2 face each other, and the end of each V-shaped segment L2 is connected to a straight line segment L1.

[0036] When the top closure closing area 111 is in the closed state, each side of the V-shaped segment L2 is in contact with the straight line segment L1 connected thereto.

[0037] It should be understood that before the sealing top sealing area 110, the top sealing area 110 as a whole is in a ring structure, and the part of the sleeve body 100 corresponding to the top sealing area 110 needs to be folded to form the top sealing transition area 112 and the top closure closing area 111. Specifically, the opposite sides of the top sealing transition area 112 need to be bent to form V-shaped segments L2 on the opposite sides of the top closure closing area 111.

[0038] It should be noted that by setting the two ends of the top closure closing area 111 as V-shaped seals, the sealing effect of the sleeve body 100 at the top closure closing area 111 can be ensured, thereby improving the protection effect of the sleeve body 100 on the battery cell 200.

[0039] In addition, it is worth noting that after the V-shaped segment L2 is in contact with the straight line segment L1 on each side, the outer surfaces of the two sides of the V-shaped segment L2 can also be arranged to be in contact with each other, so that the sharp corners of the V-shaped segment L2 are hidden in the middle position, and the entire top closure closing area 111 is approximately in a parallel state, avoiding sealing failure of the sleeve body 100 from the sharp corners of the V-shaped segment L2 during use, and further improving the protection effect of the sleeve body 100.

[0040] In one embodiment, referring to the structure shown in Figure 4 The battery packaging structure provided by the embodiment of the present application further comprises a battery cell 200 and a conversion sheet 300, wherein:

[0041] The battery cell 200 comprises a body part and a tab group, the tab group is arranged on one side of the body part; the tab group comprises two tab parts with opposite polarities, and each tab part is connected with one conversion sheet 300;

[0042] One end of the conversion sheet 300 is connected to the tab part, and the other end penetrates out of the sleeve body 100 from the top closure closing area 111.

[0043] It should be understood that Figure 4 The sleeve body 100 is shown in the form of an unfolded rectangular film body, and details are not repeated; the body part of the battery cell 200 is formed by folding or winding a plurality of pole pieces, the end of the pole piece is provided with a tab, and each tab part can be formed by one or more tabs.

[0044] For example, when the battery packaging structure provided by the embodiment of the present application is applied, the sleeve body 100 can be sleeved outside the battery cell 200 to directly form a soft package battery.

[0045] It should be noted that the sleeve 100 can play the role of insulation and barrier to external moisture to protect the battery cell 200.

[0046] Please combine Figure 1 Continue to refer to Figure 4 The structure shown, specifically, the body part of the battery cell 200 and the tab group are placed in the sealed placement cavity, each tab part in the tab group is connected to an adapter piece 300, the other end of the adapter piece 300 passes out of the sleeve 100 from the top closure area 111 to ensure that the battery cell 200 and the external structure are successfully connected.

[0047] It is worth noting that at the position where the adapter piece 300 passes out of the top closure area 111, the sealing effect of the top closure area 111 needs to be ensured to avoid the existence of a gap between the top closure area 111 and the adapter piece 300, which affects the sealing effect.

[0048] When the tab part in the battery cell 200 is specifically set, since the structure of the sleeve 100 has changed compared to the existing insulation film, a specially designed tab part can be used so that the tab part can cooperate with the adapter piece 300 to form a battery that meets the requirements. Details are not repeated.

[0049] In one embodiment, please refer to Figure 4 And Figure 5 The structure shown, the adapter piece 300 includes a main body part 310 and an adhesive part 320, wherein:

[0050] The main body part 310 is connected to the tab part at one end and passes out of the sleeve 100 from the top closure area 111 at the other end;

[0051] At least part of the adhesive part 320 is connected to the main body part 310, and the main body part 310 is adhered to the inner surface of the top closure area 111 through the adhesive part 320.

[0052] It should be noted that the adapter piece 300 is adhered to the inner surface of the top closure area 111 by the adhesive part 320, which can improve the stability of the adapter piece 300 and avoid the adapter piece 300 from shaking relative to the top closure area 111, thereby effectively avoiding the generation of a gap between the adapter piece 300 and the top closure area 111 due to relative shaking during use, which causes protection failure.

[0053] It is worth noting that when the top closure area 111 changes from an open state to a closed state, the heat sealing process can be used as an example. During heat sealing, the adhesive relationship between the adapter part and the sleeve 100 will not be damaged; on the contrary, when the top closure area 111 is sealed, the inner surface of the sleeve 100 can be fused and adhered to the adhesive part 320 of the adapter piece 300 under the action of heating to better seal the adapter piece 300 in the top closure area 111.

[0054] In one embodiment, please continue to combine Figure 3 Referring to Figure 5 the structure shown, the bonding portion 320 extends from the body portion to both sides to form a first bonding area 321 and a second bonding area 322, wherein:

[0055] The first bonding area 321 is bonded to the inner surface of the two straight line segments L1;

[0056] The second bonding area 322 is arranged opposite to the first bonding area 321; the second bonding area 322 includes two bonding sub-areas, the two bonding sub-areas have an included angle, and each bonding sub-area is inserted between the straight line segment L1 and one side of the V-shaped segment L2 to bond the inner surface of the straight line segment L1 and the inner surface of the V-shaped segment L2.

[0057] Specifically, please combine Figure 5 Referring to Figure 3 the structure shown, in each adapter tab 300, the first bonding area 321 bonds the inner surfaces of the two opposite straight line segments L1; the second bonding area 322 is specifically divided into two bonding sub-areas, and each bonding sub-area is inserted between the straight line segment and one side of the V-shaped segment L2 to effectively bond the top closure closure area 111 in the open state.

[0058] It should be noted that there are multiple bonding positions between each adapter tab 300 and the sleeve body 100, which can improve the bonding effect between the adapter tab 300 and the sleeve body 100.

[0059] Of course, the second bonding area 322 of the bonding portion 320 can also be provided with only one bonding sub-area, and the adapter tab 300 is fixed with the sleeve body 100 only by using one bonding sub-area and one first bonding area 321, which will not be described in detail.

[0060] In the adapter tab 300 provided by the embodiments of the present application, the bonding portion 320 can be prepared and formed in various structures, for example, the bonding portion 320 can be formed by at least two tab glues. In one embodiment, the bonding portion 320 is formed by two tab glues, and each tab glue is bonded to one side of the adapter tab 300; along the extension direction of the tab glue, the two tab glues have an overlapping area (such as Figure 5 the black area in the figure) beyond the body portion 310;

[0061] On one side of the adapter tab 300, one tab glue forms a first bonding area 321 after passing through the overlapping area;

[0062] On the other side of the adapter tab 300, the two tab glues are separated after passing through the overlapping area, and each tab glue forms a bonding sub-area.

[0063] It should be noted that the form of the tab adhesive to form the bonding part 320 is simple and easy to operate, which only needs to paste the tab adhesive on the main body part 310 of the adapter piece 300. Specifically, when bonding the tab adhesive on each adapter piece 300, two tab adhesives can be used, and if the main body part 310 is arranged vertically, each tab adhesive is bonded horizontally on one side of the tab group. One of the two tab adhesives extends from the main body part 310 to form a first bonding area 321 and a bonding sub-area, respectively, and the other tab adhesive extends from the main body part 310 to form another bonding sub-area.

[0064] Please continue to combine Figure 5 Reference Figure 3 The structure shown in the drawing, in each adapter piece 300, the tab adhesive forming the first bonding area 321 bonds the inner surface of the opposite two straight line segments L1; each tab adhesive forming the bonding sub-area is inserted between the straight line end and one side of the V-shaped segment L2, so as to effectively bond the top closure closure area 111 in the open state.

[0065] It should be noted that the two tab adhesives can have an overlapping area beyond the main body part 310 to improve the relative stability of the two tab adhesives, and at the same time, it can be ensured that the main body part 310 of the adapter piece 300 is effectively bonded on each side with the inner surface of the sleeve body 100, avoiding the tab adhesive from the main body part 310, and the bonding relationship between the main body part 310 of the adapter piece 300 and the sleeve body 100 is invalid.

[0066] Please combine Figure 5 Reference Figure 3 and Figure 4 As shown in the structure, since the two V-shaped segments L2 in the top closure closure area 111 are oppositely arranged, the second bonding area 322 on each adapter piece 300 is arranged away from the second bonding area 322 on the other adapter piece 300.

[0067] In addition, it should be noted that the tab group of the battery cell 200 includes two tab parts, and the two tab parts have opposite polarities. When one tab part is a positive tab part, the other tab part is a negative tab part. Correspondingly, when the battery is applied, the adapter piece 300 connected with the positive tab part will be positively charged, and the adapter piece 300 connected with the negative tab part will be negatively charged, and the two adapter pieces 300 need to be insulated to avoid short circuit.

[0068] In one embodiment, the main sealing area 120 only has one sealing mark (as shown in Figure 7 ).

[0069] It should be understood that, since the sleeve body 100 is formed by a rectangular film body, plastic packaging after bending, and the rectangular film body is bent around the body part of the battery cell 200, an annular structure is formed, at this time, along the circumferential direction, the main sealing area 120 only has one to be sealed. Correspondingly, after heat sealing of the main sealing area 120, the main sealing area 120 only has one sealing mark.

[0070] It should be noted that, since the main sealing area 120 only has one sealing mark, the sealing performance of the sleeve body 100 formed after heat sealing is good, and the position of the sealing mark of the main sealing area 120 can be set or adjusted according to requirements, which can reduce the packaging difficulty; at the same time, the structure setting makes the sleeve body 100 can be applied to battery cells 200 of various sizes, and is no longer limited by the punching process.

[0071] It should be noted that, the battery cell 200 has six surfaces, of which two surfaces are oppositely arranged and have a larger area, forming a large surface of the battery cell 200; the other four surfaces have a smaller area; the sealing mark of the main sealing area 120 can correspond to any surface of the battery cell 200.

[0072] Exemplarily, the sealing mark can be set to correspond to the large surface of the battery cell 200. It should be noted that this setting form can facilitate heat sealing of the sleeve body 100, so as to further reduce the packaging difficulty and improve the packaging efficiency.

[0073] In one embodiment, the sealing mark is parallel to the surface of the battery cell 200 corresponding thereto.

[0074] It should be noted that, in the battery formed by the battery packaging structure provided in the embodiments of the present application, there is no plastic film side sealing edge, which can reduce the side sealing step; at the same time, the battery has no side sealing edge, compared with the conventional battery, the folding step is reduced, and the volume utilization rate can be improved.

[0075] It should be understood that the "side sealing edge" refers to a sealing edge structure whose extension direction is perpendicular to the surface of the battery cell 200.

[0076] In one embodiment, the bottom sealing area 130 has a first state and a second state, wherein:

[0077] When the bottom sealing area 130 is in the first state, the bottom sealing area 130 includes a first straight line segment and a second straight line segment, the first straight line segment and the second straight line segment are connected end to end to form an annular structure;

[0078] When the bottom sealing area 130 is in the second state, the first straight line segment and the second straight line segment are folded to at least partially overlap and close.

[0079] Specifically, before heat-sealing the bottom sealing area 130, the two straight-line segments of the sleeve body 100 in the bottom sealing area 130 need to be folded, so that one straight-line segment is pressed on the surface of the other straight-line segment; then, the part where the first straight-line segment coincides with the second straight-line segment is heat-sealed, so that the sleeve body 100 is completely changed from a rectangular film body to an integrated structure with a sealed placement cavity.

[0080] It should be noted that the form of two straight-line segments and lap sealing in the bottom sealing area 130 can improve the sealing effect of the sleeve body 100 at the bottom, so as to effectively protect the battery cell 200 by the sleeve body 100.

[0081] In an embodiment, the part of the bottom sealing area 130 that exceeds the battery cell 200 is folded inward to the bottom of the battery cell 200 after heat-sealing.

[0082] It should be noted that this form of setting can avoid the part of the sleeve body 100 at the bottom that exceeds the battery cell 200 being accidentally touched, and can improve the service life of the sleeve body 100, so as to continuously and effectively protect the battery cell 200 by the sleeve body 100.

[0083] It should be understood that the sealed placement cavity of the sleeve body 100 can also be filled with electrolyte or provided with other structures, which can be set according to requirements, and will not be described here.

[0084] In an embodiment, the sleeve body 100 is formed of an aluminum plastic film.

[0085] It should be noted that the aluminum plastic film can not only ensure the protection effect of the sleeve body 100 on the battery cell 200, but also reduce the overall weight of the battery.

[0086] In a second aspect, the embodiments of the present application provide a battery packaging method. Figure 6 The flowchart of the battery packaging method provided by the embodiments of the present application is shown in FIG. 6. Figure 1 and Figure 4 Reference Figure 6 The battery packaging method provided by the embodiments of the present application includes:

[0087] Step S602: forming a rectangular film body according to the size of the battery cell 200, as shown in FIG. 6. Figure 4

[0088] ​Step S604: folding and plastic packaging the rectangular film body, so that the rectangular film body forms a sleeve body 100, the sleeve body 100 is a one-piece structure, and the battery cell 200 is placed in a sealed placement cavity of the sleeve body 100; the sleeve body 100 includes a top sealing area 110, a main sealing area 120 and a bottom sealing area 130 arranged in sequence, the top sealing area 110 includes a top sealing transition area 112 and a top sealing closing area 111, the top sealing transition area 112 is located between the main sealing area 120 and the top sealing closing area 111, and points to the direction of the top sealing closing area 111 along the main sealing area 120, and the size of the top sealing transition area 112 gradually decreases.

[0089] It should be understood that the rectangular film body is folded and plastic packaged to form a sleeve body 100 of a one-piece structure. Specifically, rectangular film bodies of different sizes can be cut according to the size of the battery cell 200, and then the rectangular film body is folded and the one-piece structure is formed according to the size of the battery cell 200.

[0090] It should be noted that the battery packaging method provided by the embodiments of the present application can be adapted to battery cells 200 of different sizes. Specifically, the sleeve body 100 can be used to wrap battery cells 200 of various lengths, widths and thicknesses to ensure the protection effect of the battery cell 200.

[0091] Meanwhile, the battery packaging method provided by the embodiments of the present application changes the original packaging method, cancels the aluminum plastic film pit, and solves the problem that the thickness direction cannot be broken through due to the characteristics of the aluminum plastic film. The sleeve body 100 of the one-piece structure can be used to manufacture a battery with a thicker thickness. Moreover, the battery packaging method provided by the embodiments of the present application reduces the folding step compared with the conventional battery packaging method, and can improve the volume utilization rate.

[0092] Specifically, when the sleeve body 100 formed by the battery packaging method provided by the embodiments of the present application is used, the top sealing area 110, the main sealing area 120 and the bottom sealing area 130 in the sleeve body 100 cooperate with each other to form an effective sealed placement cavity, and the battery cell 200 can be placed in the sealed placement cavity of the sleeve body 100 to effectively protect the battery cell 200. The top sealing area 110 includes a top sealing transition area 112 and a top sealing closing area 111, and the size of the top sealing transition area 112 gradually decreases, so that the size of the main sealing area 120 to the top sealing closing area 111 gradually decreases. On the one hand, it can improve the fitting degree of the sleeve body 100 and the battery cell 200, and on the other hand, it can improve the sealing effect at the top sealing closing area 111.

[0093] In one embodiment, in step S602, the rectangular film body is formed according to the size of the battery cell 200, including:

[0094] According to the size of the battery cell 200, the original film material is cut to form an initial rectangular film body;

[0095] According to the size of the battery cell 200, the initial rectangular film body is pre-folded to form a rectangular film body.

[0096] It should be noted that, since the sleeve body 100 is formed by folding and plastic packaging of the rectangular film body, a rectangular film body meeting the requirements can be formed according to the size of the battery cell 200, so that the sleeve body 100 can be used to wrap and cover battery cells 200 of various lengths, widths and thicknesses, to ensure the protection effect of the battery cell 200 and manufacture a battery with a thicker thickness.

[0097] It should be noted that, please continue to refer to Figure 4 The structure shown in FIG. 1, the battery cell 200 has six surfaces, two of which are oppositely arranged and have a larger area to form the large surface of the battery cell 200; the other four surfaces have a smaller area. If one side of the four surfaces on which the tabs are arranged is defined as the top surface of the battery cell 200, then the opposite surface is the bottom surface of the battery cell 200, and the other two surfaces are the side surfaces of the battery cell 200.

[0098] In one embodiment, please continue to refer to Figure 4 The structure shown in FIG. 1, the battery packaging method provided by the embodiment of the present application comprises the following steps:

[0099] The initial rectangular film body is folded to form a longitudinal separation line group on the initial rectangular film body, the longitudinal separation line group comprising a first longitudinal separation line s1, a second longitudinal separation line s2, a third longitudinal separation line s3 and a fourth longitudinal separation line s4 arranged in sequence, wherein:

[0100] The second longitudinal separation line s2 and the third longitudinal separation line s3 form a large surface area, and the width n1 of the large surface area is equal to the width of the battery cell 200;

[0101] The second longitudinal separation line s2 and the first longitudinal separation line s1 form a first thickness area, and the third longitudinal separation line s3 and the fourth longitudinal separation line s4 form a second thickness area, and the size d1 of the first thickness area and the size d2 of the second thickness area are equal to the thickness size of the battery cell 200;

[0102] The first longitudinal separation line s1 and the edge of the rectangular film body form a first reserved area, and the fourth longitudinal separation line s4 and the other edge of the rectangular film body form a second reserved area, and at least one of the size n2 of the first reserved area and the size n3 of the second reserved area is greater than half of the width of the battery cell 200. It should be understood that n2+n3 is greater than n1 to ensure that the rectangular film body can be effectively overlapped after being bent; the final value of n2+n3-n1 affects the maximum size of the overlapping area.

[0103] It should be noted that when folding the initial rectangular film body, the size of each side of the battery cell 200 should be considered to ensure that the battery cell 200 can be effectively placed in the sealed placement cavity of the sleeve body 100.

[0104] In one embodiment, in step S604, the rectangular film body is bent and molded, including:

[0105] Taking the longitudinal division line group as a reference, the first folding is performed to form a square placement space, for example, as shown in Figure 7 ;

[0106] The battery cell 200 is placed in the square placement space, and the battery cell 200 is aligned with the longitudinal division line group of the rectangular film body.

[0107] It should be noted that the battery cell 200 can also be placed on the surface of the rectangular film body first, and then the rectangular film body is bent along the longitudinal division line group to form a square placement space, which will not be described in detail here.

[0108] In one embodiment, please continue to refer to the structure shown in Figure 7 After the battery cell 200 is aligned with the longitudinal division line group of the rectangular film body, the battery packaging method provided by the embodiment of the application further includes:

[0109] Overlapping at least part of the first reserved area and the second reserved area;

[0110] The overlapping part of the first reserved area and the second reserved area is molded, and the sealing mark formed after molding is bent to make the sealing mark parallel to the surface of the battery cell 200.

[0111] Specifically, the lap joint of the folded rectangular film body is sealed, and the sealing mark is bent to make it parallel to the surface of the battery cell 200 after sealing.

[0112] It should be noted that the battery formed by the battery packaging method provided by the embodiment of the application has no plastic film side edge, which can reduce the side sealing step; at the same time, the battery has no side edge, which reduces the folding step compared with the conventional battery, and can improve the volume utilization rate.

[0113] In one embodiment, please continue to refer to the content shown in Figure 4 ; Figure 6 The initial rectangular film body is pre-folded, including:

[0114] The initial rectangular film body is folded to form a horizontal division line group on the initial rectangular film body, and the horizontal division line group includes a first horizontal division line h1 and a second horizontal division line h2 arranged in sequence, wherein:

[0115] The first horizontal division line h1 forms a top reserved area away from the second horizontal division line h2;

[0116] The first transverse separation line h1 and the second transverse separation line h2 form a main reserved area;

[0117] The second transverse separation line h2 forms a bottom reserved area away from the first transverse separation line h1.

[0118] It should be noted that the size m1 of the top reserved area is 1 / 2 x the thickness of the battery cell 200 + the sealing width of the top sealing area 110 + the top redundancy; the size m2 of the main reserved area is not less than the height of the battery cell 200; and the size m3 of the bottom reserved area is 1 / 2 x the thickness of the battery cell 200 + the sealing width of the bottom sealing area 130 + the bottom redundancy.

[0119] It should be understood that the "sealing width" refers to the size of the overlapping part of the rectangular film body during heat sealing; the top redundancy and the bottom redundancy can be set according to requirements, which will not be described here. For example, the redundancy can be set to 2 mm, and of course, the redundancy can also be set to other values according to requirements, which will not be described again.

[0120] It should be noted that the transverse separation group on the rectangular film body can be formed before the longitudinal separation group, or the transverse separation group on the rectangular film body can be formed after the longitudinal separation group; in addition, the transverse separation group on the rectangular film body can be formed before the square placement space is formed, or can be formed after the square placement space is formed.

[0121] In one embodiment, in step S604, the rectangular film body is bent and plastic sealed, and further comprising:

[0122] The top reserved area is folded to form the top sealing closure area 111 in an open state, which includes two linear segments L1 arranged oppositely and two V-shaped segments L2 arranged oppositely, the sharp corners of the V-shaped segments L2 are directed to the other V-shaped segment L2, and the end of each V-shaped segment L2 is connected to a linear segment L1;

[0123] The top sealing closure area 111 in the open state is heat sealed to form the top sealing closure area 111 in a closed state, and each side of the V-shaped segment L2 in the top sealing closure area 111 in the closed state is in contact with the linear segment L1 connected thereto.

[0124] It should be understood that before the top reserved area is formed into the top sealing area 110, the top sealing area 110 as a whole has a ring structure, and the part of the sleeve body 100 corresponding to the top sealing area 110 needs to be folded to form the top sealing transition area 112 and the top sealing closure area 111. Specifically, the opposite sides of the top sealing transition area 112 need to be bent to form the V-shaped segments L2 on the opposite sides of the top sealing closure area 111.

[0125] It should be noted that by setting the two ends of the top sealing closure area 111 as V-shaped seals, the sealing effect of the sleeve body 100 at the top sealing closure area 111 can be ensured, so as to improve the protection effect of the sleeve body 100 on the battery cell 200.

[0126] In addition, it is worth noting that after the V-shaped section L2 is attached to each linear section L1, the outer surfaces of the two edges of the V-shaped section L2 can be attached to each other, so that the sharp corners of the V-shaped section L2 are hidden in the middle position, and the entire top sealing closure area 111 is approximately parallel, which can avoid sealing failure of the sleeve body 100 at the sharp corners of the V-shaped section L2 during use, and further improve the protection effect of the sleeve body 100.

[0127] In one embodiment, please refer to Figure 8 Before heat sealing the top sealing closure area 111 in the open state to form the top sealing closure area 111 in the closed state, the battery packaging method provided by the embodiment of the application further comprises:

[0128] The adapter piece 300 connected to the tab portion of the battery cell 200 is aligned with the top sealing closure area 111 in the open state, so that the other end of the adapter piece 300 exceeds the top sealing closure area 111 in the open state.

[0129] Specifically, the body portion and the tab group of the battery cell 200 are arranged in the sealed placement cavity, each tab portion in the tab group is connected to an adapter piece 300, and the other end of the adapter piece 300 penetrates out of the sleeve body 100 from the top sealing closure area 111, so as to ensure smooth connection between the battery cell 200 and the external structure.

[0130] It is worth noting that at the position where the adapter piece 300 penetrates out of the top sealing closure area 111, the sealing effect of the top sealing closure area 111 needs to be ensured to avoid gaps between the top sealing closure area 111 and the adapter piece 300, which affects the sealing effect.

[0131] When the tab portion in the battery cell 200 is specifically arranged, since the structure of the sleeve body 100 has changed compared with the existing insulating film, a specially designed tab portion can be used so that the tab portion can cooperate with the adapter piece 300 to form a battery that meets the requirements, and details are not repeated here.

[0132] In one embodiment, please continue to refer to Figure 5 and Figure 8 The adapter piece 300 comprises a main body portion 310 and an adhesive portion 320, at least part of the adhesive portion 320 is connected to the main body portion 310, and the adhesive portion 320 extends to both sides from the main body portion 310 to form a first adhesive area 321 and a second adhesive area 322; the adapter piece 300 connected to the tab portion of the battery cell 200 is aligned with the top sealing closure area 111 in the open state, which comprises:

[0133] The first bonding area 321 in the adapter piece 300 bonds the inner surfaces of the two straight line segments L1 in the top closure closing area 111 in the open state;

[0134] Each bonding sub-area in the second bonding area 322 in the adapter piece 300 is inserted between the straight line segment L1 and one side of the V-shaped segment L2 and bonds the inner surface of the straight line segment L1 and the inner surface of the V-shaped segment L2.

[0135] Specifically, please continue to refer to Figure 8 In the structure shown, in each adapter piece 300, the first bonding area 321 bonds the inner surfaces of the two opposite straight line segments L1; the second bonding area 322 is specifically divided into two bonding sub-areas, each of which is inserted between the straight line segment and one side of the V-shaped segment L2 to effectively bond the top closure closing area 111 in the open state.

[0136] It should be noted that there are multiple bonding positions between each adapter piece 300 and the sleeve body 100, which can improve the bonding effect between the adapter piece 300 and the sleeve body 100.

[0137] Of course, the second bonding area 322 of the bonding part 320 can also have only one bonding sub-area, and the adapter piece 300 is fixed to the sleeve body 100 only by using one bonding sub-area and one first bonding area 321, which will not be described in detail.

[0138] Please continue to refer to Figure 8 In the structure shown, since the two V-shaped segments L2 in the top closure closing area 111 are arranged opposite to each other, the second bonding area 322 on each adapter piece 300 is arranged away from the second bonding area 322 on the other adapter piece 300.

[0139] In addition, it is worth noting that the tab group of the battery cell 200 includes two tab parts, and the polarities of the two tab parts are opposite to each other. When one tab part is a positive tab part, the other tab part is a negative tab part. Correspondingly, when the battery is applied, the adapter piece 300 connected to the positive tab part will carry positive electricity, and the adapter piece 300 connected to the negative tab part will carry negative electricity, and the two adapter pieces 300 are insulated from each other to avoid short circuit.

[0140] In one embodiment, after forming the top closure closing area 111 in the closed state, the battery packaging method provided in the embodiment of the application further comprises:

[0141] According to the preset process, drying, liquid injection, and formation operation are performed from the bottom reserved area.

[0142] Of course, the battery packaging method provided in the embodiment of the application can also include other steps in addition to drying, liquid injection, and formation, which will not be described in detail.

[0143] In one embodiment, after the drying, liquid injection, and formation operation from the bottom reserved area, the battery packaging method provided by the embodiments of the present application further includes:

[0144] folding the bottom reserved area to form a first state of the bottom sealing area 130, the first state of the bottom sealing area 130 including a first straight line segment and a second straight line segment, the first straight line segment and the second straight line segment being connected end to end to form a ring structure;

[0145] heat sealing the first state of the bottom sealing area 130 to form a second state of the bottom sealing area 130, in the second state of the bottom sealing area 130, the first straight line segment and the second straight line segment are folded to at least partially overlap and are closed to form Figure 9 the structure shown.

[0146] Specifically, before heat sealing the bottom sealing area 130, the two straight line segments of the sleeve body 100 in the bottom sealing area 130 need to be folded so that one straight line segment is pressed on the surface of the other straight line segment; then, the portion where the first straight line segment overlaps the second straight line segment is heat sealed, so that the sleeve body 100 is completely changed from a rectangular film body to an integrated structure with a sealed placement cavity.

[0147] It should be noted that, in the form of the two straight line segments of the bottom sealing area 130 being overlapped and sealed, the sealing effect of the sleeve body 100 at the bottom can be improved to ensure that the sleeve body 100 can effectively protect the battery cell 200.

[0148] In one embodiment, after forming the second state of the bottom sealing area 130, the battery packaging method provided by the embodiments of the present application further includes:

[0149] shaping the second state of the bottom sealing area 130, folding the two portions of the second state of the bottom sealing area 130 that are outside the battery cell 200 inward to the bottom of the battery cell 200 to form Figure 10 the structure shown.

[0150] It should be noted that, in the form of the two straight line segments of the bottom sealing area 130 being overlapped and sealed, the sealing effect of the sleeve body 100 at the bottom can be improved to ensure that the sleeve body 100 can effectively protect the battery cell 200.

[0151] In a third aspect, the embodiments of the present application provide a battery. The battery provided by the embodiments of the present application includes the battery packaging structure provided by any of the technical solutions of the first aspect.

[0152] It should be noted that the battery provided by the embodiments of the present application can form the sleeve 100 suitable for different sizes of the battery cell 200, and specifically, the sleeve 100 can perform the wrapping operation on the battery cell 200 of various lengths, widths and thicknesses to ensure the protection effect on the battery cell 200. Meanwhile, the battery packaging structure changes the original packaging mode, cancels the aluminum plastic film punching pit, solves the problem that the thickness direction cannot be broken through due to the characteristics of the aluminum plastic film itself, and the sleeve 100 with the integrated structure can be used to manufacture a battery with a thicker thickness. Moreover, the battery packaging structure reduces the folding step compared with the conventional battery packaging structure, and can improve the volume utilization rate.

[0153] In a fourth aspect, the embodiments of the present application provide a power consumption device. The power consumption device provided by the embodiments of the present application includes the battery provided by any of the technical solutions of the third aspect.

[0154] It should be noted that in the power consumption device provided by the embodiments of the present application, the battery packaging structure in the battery can form the sleeve 100 suitable for different sizes of the battery cell 200, and specifically, the sleeve 100 can perform the wrapping operation on the battery cell 200 of various lengths, widths and thicknesses to ensure the protection effect on the battery cell 200. Meanwhile, the battery packaging structure changes the original packaging mode, cancels the aluminum plastic film punching pit, solves the problem that the thickness direction cannot be broken through due to the characteristics of the aluminum plastic film itself, and the sleeve 100 with the integrated structure can be used to manufacture a battery with a thicker thickness. Moreover, the battery packaging structure reduces the folding step compared with the conventional battery packaging structure, and can improve the volume utilization rate.

[0155] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0156] It should be understood that the present application is not limited to the precise construction which has been described above and which has been shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present application. The scope of the present application is limited only by the appended claims.

Claims

1. A battery packaging structure, characterized by, The application relates to a battery sleeve and a battery cell. The battery sleeve comprises a sleeve body which is formed by folding and plastic packaging a rectangular film body, and has a sealed placement cavity for placing a battery cell. The sleeve body comprises a top sealing area, a main sealing area and a bottom sealing area arranged in sequence. The top sealing area comprises a top sealing transition area and a top sealing closing area. The top sealing transition area is located between the main sealing area and the top sealing closing area and gradually decreases in size along the main sealing area towards the top sealing closing area.

2. The battery packaging structure of claim 1, wherein, The top sealing closing area has an open state and a closed state. When the top sealing closing area is in the open state, the top sealing closing area comprises two opposite straight line segments and two opposite V-shaped segments. When the top sealing closing area is in the closed state, each side of the V-shaped segment and the straight line segment connected with the V-shaped segment are attached.

3. The battery packaging structure of claim 2, wherein, The battery cell comprises a body part and a tab group. Each tab part is connected with an adapter piece. The adapter piece is connected with the tab part at one end and passes through the sleeve body from the top sealing closing area at the other end.

4. The battery packaging structure of claim 3, wherein, The adapter piece comprises a main body part and an adhesive part. The main body part is connected with the tab part at one end and passes through the sleeve body from the top sealing closing area at the other end. The adhesive part is connected with the main body part at least in part, and the main body part is connected with the inner surface of the top sealing closing area through the adhesive part.

5. The battery packaging structure of claim 4, wherein, The adhesive part extends from the body part to both sides to form a first adhesive area and a second adhesive area.

6. The battery packaging structure of claim 5, wherein, The first adhesive area is connected with the inner surface of the two straight line segments. The second adhesive area is opposite to the first adhesive area and comprises two adhesive sub-areas. The two adhesive sub-areas have an included angle and are inserted between the straight line segment and one side of the V-shaped segment to connect the inner surface of the straight line segment and the inner surface of the V-shaped segment.

7. The battery packaging structure according to any one of claims 1 to 6, wherein The adhesive part is formed by at least two tab rubbers. The adhesive part is formed by two tab rubbers.

8. The battery packaging structure of claim 7, wherein, The main sealing area has only one sealing mark.

9. The battery packaging structure according to any one of claims 1 to 6, wherein The sealing mark corresponds to one surface of the battery cell. The sealing mark is parallel to the surface of the battery cell corresponding to the sealing mark. The bottom sealing area has a first state and a second state. When the bottom sealing area is in the first state, the bottom sealing area comprises a first straight line segment and a second straight line segment. The first straight line segment and the second straight line segment are connected in a ring structure. When the bottom sealing area is in the second state, the first straight line segment and the second straight line segment are folded to and at least partially overlap and are closed.

10. A battery packaging method, characterized by, The method comprises: forming a rectangular film body according to the size of the battery cell; bending and plastic sealing the rectangular film body to form a sleeve body, the sleeve body being a one-piece structure, and the battery cell being placed in a sealed placement cavity of the sleeve body; the sleeve body comprises a top sealing area, a main sealing area and a bottom sealing area arranged in sequence, the top sealing area comprises a top sealing transition area and a top sealing closing area, the top sealing transition area is located between the main sealing area and the top sealing closing area and points to the direction of the top sealing closing area along the main sealing area, and the size of the top sealing transition area gradually decreases; the forming of the rectangular film body according to the size of the battery cell comprises: cutting an original film material according to the size of the battery cell to form an initial rectangular film body; pre-folding the initial rectangular film body according to the size of the battery cell to form a rectangular film body; wherein the pre-folding of the initial rectangular film body comprises: folding the initial rectangular film body to form a set of horizontal separation lines on the initial rectangular film body, the set of horizontal separation lines comprising a first horizontal separation line and a second horizontal separation line arranged in sequence, wherein the first horizontal separation line forms a top reserved area away from the second horizontal separation line; the bending and plastic sealing of the rectangular film body further comprises: folding the top reserved area to form a top sealing closing area in an open state, the top sealing closing area in the open state comprising two straight line segments arranged oppositely and two V-shaped segments arranged oppositely, the sharp corners of the V-shaped segments pointing to the other V-shaped segment, and the end of each V-shaped segment being connected to a straight line segment; heat sealing the top sealing closing area in the open state to form a top sealing closing area in a closed state, each side of the V-shaped segment in the top sealing closing area in the closed state being in contact with the straight line segment connected thereto.

11. The battery packaging method of claim 10, wherein, the pre-folding of the initial rectangular film body comprises: folding the initial rectangular film body to form a set of longitudinal separation lines on the initial rectangular film body, the set of longitudinal separation lines comprising a first longitudinal separation line, a second longitudinal separation line, a third longitudinal separation line and a fourth longitudinal separation line arranged in sequence, wherein: a large area is formed between the second longitudinal separation line and the third longitudinal separation line, and the width of the large area is equal to the width of the battery cell; a first thickness area is formed between the second longitudinal separation line and the first longitudinal separation line, and a second thickness area is formed between the third longitudinal separation line and the fourth longitudinal separation line, and the size of the first thickness area and the second thickness area is equal to the thickness of the battery cell; at least one of the first reserved area formed between the first longitudinal separation line and the edge of the rectangular film body and the second reserved area formed between the fourth longitudinal separation line and the other edge of the rectangular film body has a size greater than half the width of the battery cell.

12. The battery packaging method of claim 11, wherein, the bending and plastic sealing of the rectangular film body comprises: performing a first folding based on the set of longitudinal separation lines to form a square placement space; The battery cell is placed in the square placement space, and the battery cell is aligned with the longitudinal division lines of the rectangular film body.

13. The battery packaging method of claim 12, wherein, After the battery cell is aligned with the longitudinal division lines of the rectangular film body, the battery packaging method further comprises: The first reserved area at least partially overlaps the second reserved area; The overlapping part of the first reserved area and the second reserved area is plastic sealed, and the sealing mark formed after plastic sealing is bent to make the sealing mark parallel to the surface of the battery cell.

14. The battery packaging method according to any one of claims 10-13, wherein, The main body reserved area is formed between the first transverse division line and the second transverse division line; The bottom reserved area is formed on the side of the second transverse division line away from the first transverse division line.

15. The battery packaging method of claim 10, wherein, Before the top closure closing area in the open state is heat sealed to form the top closure closing area in the closed state, the method further comprises: The adapter sheet connected with the tab of the battery cell is aligned with the top closure closing area in the open state, so that the other end of the adapter sheet exceeds the top closure closing area in the open state.

16. The battery packaging method of claim 15, wherein, The adapter sheet comprises a main body and an adhesive part, at least part of the adhesive part is connected with the main body, and the adhesive part extends to both sides from the main body to form a first adhesive area and a second adhesive area; The adapter sheet connected with the tab of the battery cell is aligned with the top closure closing area in the open state, so that the other end of the adapter sheet exceeds the top closure closing area in the open state. The first adhesive area in the adapter sheet is controlled to adhere to the inner surfaces of the two straight line segments in the top closure closing area in the open state; Each adhesive sub-area in the second adhesive area in the adapter sheet is controlled to be inserted between the straight line segment and one side of the V-shaped segment, and to adhere to the inner surface of the straight line segment and the inner surface of the V-shaped segment.

17. The battery packaging method of claim 14, wherein, After the top closure closing area in the closed state is formed, the battery packaging method further comprises: According to a predetermined process, drying, liquid injection, and formation operation are performed from the bottom reserved area.

18. The battery packaging method of claim 17, wherein, After the drying, liquid injection, and formation operation are performed from the bottom reserved area, the battery packaging method further comprises: The bottom reserved area is folded to form a bottom sealing area in a first state, the bottom sealing area in the first state comprises a first straight line segment and a second straight line segment, the first straight line segment and the second straight line segment are connected end to end to form a ring structure; The bottom sealing area in the first state is heat sealed to form a bottom sealing area in a second state, in the bottom sealing area in the second state, the first straight line segment and the second straight line segment are folded to at least partially overlap and close.

19. The battery packaging method of claim 18, wherein, After the bottom sealing area in the second state is formed, the battery packaging method further comprises: The bottom sealing area in the second state is shaped, and the two parts of the bottom sealing area in the second state that exceed the battery cell are folded inward to the bottom of the battery cell.

20. A battery, characterized by The battery packaging structure according to any one of claims 1-9.

21. An electrical device, comprising: The battery according to claim 20.

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