Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, comprising a battery cell, at least one end of which is provided with a tab; the membrane shell covers the peripheral part of the battery cell, the membrane shell comprises a first pit surface, a second pit surface, a top sealing edge and a side sealing edge, the side sealing edge comprises a first bent part and a first straight part, the first straight part is attached to the side part of the first pit surface and extends along the thickness direction of the battery cell, the top sealing edge comprises a second bent part and a second straight part, and the second straight part is opposite to the end surface of the battery cell; the part, exceeding the battery cell end face, of the side sealing edge comprises a third bent part and a bevel part, the first part of the bevel part is located on the side, away from the battery cell end face, of the top sealing edge, the second part of the bevel part is located on the outer side of the part, close to the first pit face, of the battery cell end face, and the first direction is perpendicular to the second direction. The structure is beneficial to reducing the damage of the top sealing edge and the side sealing edge exceeding the end surface of the battery cell; the formation of a double-pit C-PACK structure is facilitated, the end space of the battery is saved, and the capacity and the energy density of the battery are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and more specifically, to a battery. Furthermore, this utility model also relates to an electrical device comprising the aforementioned battery. Background Technology

[0002] As the requirements for battery capacity and energy density become increasingly stringent, in order to make full use of the end space of the cell, the C-PACK structure is currently adopted for single-pit batteries. That is, the top sealing edge of the cell end face is bent so that the protection board is placed flat on the side of the top sealing edge away from the cell end face. This helps to reduce the end space occupied by the protection board, thereby helping to improve the capacity and energy density of the cell.

[0003] For dual-pit batteries, there is currently no C-PACK structure, which results in low battery capacity and energy density.

[0004] In conclusion, how to improve the capacity and energy density of dual-pit batteries is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a battery that is a dual-pit battery with high capacity and energy density.

[0006] Another objective of this invention is to provide an electrical device comprising the aforementioned battery, wherein the battery has high capacity and energy density.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A battery comprising:

[0009] The battery cell has a tab at at least one end;

[0010] A membrane shell covers the outer periphery of the battery cell. The membrane shell includes a first pitted surface, a second pitted surface, a top sealing edge, and a side sealing edge. The side sealing edge includes a first bent portion and a first straight portion. The first straight portion is attached to the side of the first pitted surface and extends along the thickness direction of the battery cell. The top sealing edge includes a second bent portion and a second straight portion. The second straight portion is connected to the end face of the battery cell through the second bent portion, and the second straight portion is opposite to the end face of the battery cell. The connection point between the top sealing edge and the end face of the battery cell is at a first distance from the first pitted surface, and the connection point is at a second distance from the second pitted surface. The portion of the side sealing edge extending beyond the end face of the battery cell includes a third bent portion and a corner portion. The corner portion is connected to the first straight portion through the third bent portion. The first part of the corner portion is located on the side of the top sealing edge away from the end face of the battery cell, and the second part of the corner portion is located on the outer side of the portion of the end face of the battery cell close to the first pitted surface.

[0011] Optionally, the portion of the tab extending beyond the top sealing edge includes a fourth bent portion and a third straight portion, the third straight portion being located on the side of the second straight portion away from the end face of the battery cell.

[0012] Optionally, an insulating element is provided between the electrode tab and the top sealing edge, and the insulating element includes a fifth bend corresponding to the fourth bend.

[0013] Optionally, the distance from the end of the insulating member away from the top sealing edge to the end where the second straight portion connects to the second bent portion is less than or equal to the second distance.

[0014] Optionally, the maximum value of the distance from the end of the top sealing edge connected to the end face of the battery cell to the end of the top sealing edge away from the end face of the battery cell is A, the second distance is B, the minimum value of the height of the second bent portion along the length direction of the battery cell is C, the distance from the end of the insulating member connected to the top sealing edge to the end of the insulating member away from the top sealing edge is D, and the relationship between A, B, C and D is: A-C+D<B.

[0015] Optionally, the maximum value of D is 1.2 mm.

[0016] Optionally, the insulating component is PP adhesive or PE adhesive.

[0017] Optionally, the side of the fifth bend facing the second pit surface does not extend beyond the outer side of the second pit surface.

[0018] Optionally, the first distance is less than the second distance.

[0019] An electrical device comprising any of the aforementioned batteries.

[0020] The battery provided by this utility model, when formed, firstly, the side sealing edge is bent towards the side where the first pit surface is located, thereby forming a first bent portion and a first straight portion, such that the first straight portion is attached to the side of the first pit surface and extends along the thickness direction of the battery cell; then, the portion of the side sealing edge extending beyond the end face of the battery cell is bent towards the end face of the battery cell, thereby forming a third bent portion and a corner portion, at this time, a part of the corner portion coincides with the part of the unbent top sealing edge facing the first pit surface, and the other part of the corner portion is located on the outside of the part of the end face of the battery cell close to the first pit surface; then, the top sealing edge is bent towards the side where the second pit surface is located, thereby forming a second bent portion and a second straight portion, such that the second straight portion is opposite to the end face of the battery cell; at this point, the bending of the side sealing edge and the top sealing edge is completed, forming a structure in which a part of the corner portion is located on the side of the top sealing edge away from the end face of the battery cell, and the other part of the corner portion is located on the outside of the part of the end face of the battery cell close to the first pit surface.

[0021] Therefore, the bending method that forms the above structure makes it easier to bend the parts of the top and side seals that extend beyond the end face of the cell, thus minimizing damage to these parts. Moreover, after the top seal is bent, the second straight part faces the end face of the cell, which helps to place the battery's protection board flat on the side of the top seal away from the end face of the cell. This facilitates the formation of a double-pit C-PACK structure, saves end space of the battery, and increases the battery's capacity and energy density.

[0022] The electrical equipment provided by this utility model includes the aforementioned battery and has the same beneficial effects as the aforementioned battery. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of the battery after the side seal edge is bent toward the side where the first pit surface is located, provided in a specific embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure after the portion of the side seal extending beyond the end face of the battery cell is bent toward the end face of the battery cell.

[0026] Figure 3 This is a schematic diagram of the structure after the top sealing edge facing the second pit surface is connected to the adhesive component;

[0027] Figure 4This is a schematic diagram of the structure after the top sealing edge is bent towards the side where the second pit surface is located;

[0028] Figure 5 for Figure 4 Another structural diagram from another perspective;

[0029] Figure 6 This is a schematic diagram of the structure after the electrode tab and the insulating component are bent in the direction away from the second pit surface;

[0030] Figure 7 for Figure 6 The left view;

[0031] Figure 8 for Figure 7 EE-directed sectional view;

[0032] Figure 9 for Figure 1 The main view;

[0033] Figure 10 for Figure 1 The right view;

[0034] Figure 11 for Figure 4 The left view;

[0035] Figure 12 for Figure 11 A magnified view of part F.

[0036] Figure label:

[0037] 1-Electrode tab; 2-First pit surface; 3-Second pit surface; 4-Top sealing edge; 41-Second bend; 42-Second straight section; 5-Side sealing edge; 51-First bend; 52-First straight section; 53-Third bend; 54-Angle section; 541-First part; 542-Second part; 6-Cell end face; 7-Insulating component; 71-Fifth bend; 8-Adhesive component. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] The core of this invention is to provide a battery, which is a double-pit battery, and has high capacity and energy density. Another core aspect of this invention is to provide an electrical device including the above-mentioned battery, which also has high capacity and energy density.

[0040] It should be noted that the first direction in this embodiment of the invention refers to the width direction of the battery, that is, Figures 1-12 The first direction refers to the X-axis; the second direction refers to the height direction of the battery, that is, Figures 1-12 The Z-axis direction; the third direction refers to the thickness direction of the battery, that is, Figures 1-12 The Y-axis direction is defined in the diagram; the first direction, the second direction, and the third direction are perpendicular to each other.

[0041] Please refer to Figures 1 to 5 This utility model provides a battery, including a battery cell and a casing. At least one end of the battery cell has a tab 1. The casing covers the outer periphery of the battery cell and includes a first concave surface 2, a second concave surface 3, a top sealing edge 4, and a side sealing edge 5. The side sealing edge 5 includes a first bent portion 51 and a first straight portion 52. The first straight portion 52 is attached to the side of the first concave surface 2 and extends along the thickness direction of the battery cell. The top sealing edge 4 includes a second bent portion 41 and a second straight portion 42. The second straight portion 42 is connected to the battery cell end face 6 of the battery cell via the second bent portion 41. The second straight portion 42 is connected to the battery cell end face 6. 6. The connection between the top sealing edge 4 and the cell end face 6 is at a first distance from the first pit surface 2, and the connection between the top sealing edge 4 and the cell end face 6 is at a second distance from the second pit surface 3. The portion of the side sealing edge 5 that extends beyond the cell end face 6 includes a third bend 53 and a corner 54. The corner 54 is connected to the first straight portion 52 through the third bend 53. A part of the corner 54 (i.e., the first part 541) is located on the side of the top sealing edge 4 away from the cell end face 6, and the other part (i.e., the second part 542) is located on the outer side of the portion of the cell end face 6 near the first pit surface 2.

[0042] In forming this battery, firstly, as... Figure 1 As shown, the side sealing edge 5 is bent toward the side where the first pit surface 2 is located, thereby forming a first bent portion 51 and a first straight portion 52, such that the first straight portion 52 is attached to the side of the first pit surface 2 and extends along the thickness direction of the battery cell; then, as shown... Figure 2 As shown, the portion of the side sealing edge 5 extending beyond the cell end face 6 is bent toward the cell end face 6, thereby forming a third bend 53 and a corner 54. At this time, the first portion 541 of the corner 54 coincides with the unbent top sealing edge 4 on the side facing the first pit surface 2, and the second portion 542 of the corner 54 is located on the outer side of the portion of the cell end face 6 near the first pit surface 2; then, as... Figure 4 and Figure 5 As shown, the top sealing edge 4 is bent toward the side where the second pit surface 3 is located, thereby forming a second bent portion 41 and a second straight portion 42, so that the second straight portion 42 is opposite to the cell end face 6. To improve reliability, the side of the second straight portion 42 facing the cell end face 6 can be connected to the cell end face 6. (For example, in some embodiments, before bending the top sealing edge 4 toward the side where the second pit surface 3 is located, such as...) Figure 3As shown, an adhesive component 8 is provided on the side of the top sealing edge 4 facing the second pit surface 3, so as to connect the second straight portion 42 of the top sealing edge 4 to the cell end face 6 using the adhesive component 8. Please refer to [reference needed]. Figure 7 and Figure 8 To improve structural stability; at this point, the side sealing edge 5 and the top sealing edge 4 are bent, forming a structure in which a part of the corner portion 54 is located on the side of the top sealing edge 4 away from the cell end face 6, and the other part of the corner portion 54 is located on the outer side of the part of the cell end face 6 near the first pit surface 2.

[0043] Therefore, the bending method that forms the above structure makes it easier to bend the parts of the top sealing edge 4 and the side sealing edge 5 that extend beyond the cell end face 6, thus minimizing damage to these parts. Moreover, after the top sealing edge 4 is bent, the second straight part 42 faces the cell end face 6, which helps to place the battery protection plate flat on the side of the top sealing edge 4 away from the cell end face 6. This facilitates the formation of a double-pit C-PACK structure, saves battery end space, and improves battery capacity and energy density.

[0044] In addition, in order to enable the battery protection board to be located on the side of the top seal 4 away from the cell end face 6 after being connected to the tab 1, forming a C-PACK structure, in some embodiments, the portion of the tab 1 extending out of the top seal 4 includes a fourth bent portion and a third straight portion, with the third straight portion located on the side of the second straight portion 42 away from the cell end face 6.

[0045] It is understandable that the electrode lug 1 extends from the top sealing edge 4. When the top sealing edge 4 bends towards the side where the second pit surface 3 is located to form the second bend 41 and the second straight part 42, the part of the electrode lug 1 that overlaps with the top sealing edge 4 bends along with the top sealing edge 4. That is, when the top sealing edge 4 bends, the part of the electrode lug 1 that overlaps with the top sealing edge 4 undergoes a bend. Based on this, the part of the electrode lug 1 that extends outside the top sealing edge 4 includes the fourth bend and the third straight part. That is, after the electrode lug 1 undergoes a bend, it needs to be bent again. In other words, the electrode lug 1 needs to undergo a second bend. After the electrode lug 1 undergoes a bend, the protective plate can be connected to the electrode lug 1. After the protective plate is connected to the electrode lug 1, as... Figure 6 As shown, the portion of the tab 1 extending beyond the top seal edge 4 is bent toward the cell end face 6, so that the third straight portion is located on the side of the second straight portion 42 of the top seal edge 4 away from the cell end face 6, thereby placing the protection plate flat on the side of the top seal edge 4 away from the cell end face 6. It can be seen that the two bending directions of the tab 1 are opposite; that is, the bending direction of the fourth bend is opposite to the bending direction of the second bend 41.

[0046] Furthermore, please combine Figure 5 and Figure 6In some embodiments, an insulating element 7 is provided between the tab 1 and the top sealing edge 4, and the insulating element 7 includes a fifth bending portion 71 corresponding to the fourth bending portion.

[0047] In other words, in this embodiment, the insulating member 7 separates the tab 1 from the top sealing edge 4, thereby insulating the tab 1 from the top sealing edge 4. It can be understood that the fifth bend 71 corresponds to the fourth bend, that is, the part of the tab 1 that extends beyond the top sealing edge 4 bends together with the insulating member 7 in a direction away from the second pit surface 3. At the same time that the tab 1 forms the fourth bend, the insulating member 7 forms the fifth bend 71.

[0048] In addition, in some embodiments, the side of the fifth bend 71 facing the second pit surface 3 does not extend beyond the outer side of the second pit surface 3.

[0049] In other words, after the tab 1 and the insulating member 7 are bent together in the direction away from the second pit surface 3, the fifth bend 71 of the insulating member 7 does not protrude from the second pit surface 3. In addition, it can be understood that the insulating member 7 is wrapped around the outside of the tab 1. Therefore, when the fifth bend 71 of the insulating member 7 does not protrude from the second pit surface 3, the tab 1 after the second bend also does not protrude from the second pit surface 3. This helps to avoid increasing the size of the battery along the third direction and ensures that the bending of the tab 1 and the insulating member 7 does not affect the thickness of the battery.

[0050] In addition, in some embodiments, the distance from the end of the insulating member 7 away from the top sealing edge 4 to the end where the second straight portion 42 connects to the second bent portion 41 is less than or equal to the second distance. That is, before the fifth bent portion 71 is formed, the insulating member 7 does not extend beyond the outside of the second pit surface 3 in the third direction (i.e., the thickness direction of the battery cell); the top sealing edge 4 does not extend beyond the outside of the second pit surface 3 in the third direction.

[0051] In other words, this embodiment ensures that the top sealing edge 4 and the insulation component 7 before bending do not extend beyond the outer side of the second pit surface 3, which helps to avoid increasing the size of the battery along the third direction.

[0052] Furthermore, to ensure that the top sealing edge 4 and the unbent insulating part 7 do not extend beyond the outer side of the second pit surface 3, please combine... Figures 9 to 12 In some embodiments, the maximum distance of the top sealing edge 4 from the end connected to the cell end face 6 to the end away from the cell end face 6 is A. That is, the maximum width of the top sealing edge 4 along the second direction (i.e., the length direction of the cell) before the second bend 41 is formed is A (e.g., ...). Figure 9 As shown), the distance from the second pit surface 3 to the top sealing edge 4 near the second pit surface 3 is B (as shown). Figure 10 As shown), that is, the second distance is B, and the minimum height of the second bend 41 along the second direction is C (as shown). Figure 11 and Figure 12 As shown), the distance from the end of the insulating member 7 connected to the top sealing edge 4 to the end of the insulating member 7 away from the top sealing edge 4 is D. That is, the width of the insulating member 7 in the third direction before the fifth bend 71 is formed is D (as shown). Figure 11 and Figure 12 As shown in the figure, the relationship between A, B, C and D is: A-C+D<B.

[0053] It is understandable that when the relationship between the maximum value A of the width along the second direction of the top sealing edge 4 before the second bend 41 is formed, the distance B from the second pit surface 3 to the side of the top sealing edge 4 near the second pit surface 3, the minimum value C of the height C of the second bend 41 along the second direction, and the width D of the insulating member 7 along the third direction before the fifth bend 71 is formed satisfies the above-mentioned relationship A-C+D<B, it can be ensured that after the top sealing edge 4 is bent toward the side where the second pit surface 3 is located, the outermost side of the top sealing edge 4 and the insulating member 7 along the third direction near the second pit surface 3 does not protrude beyond the second pit surface 3, thereby ensuring that the top sealing edge 4 and the insulating member 7 do not increase the thickness of the battery along the third direction. In addition, when the size of the insulating member 7 satisfies the above-mentioned relationship, it is also beneficial to avoid the fifth bend 71 of the insulating member 7 extending beyond the outer side of the second pit surface 3 after the tab 1 and the insulating member 7 are bent toward the direction away from the second pit surface 3.

[0054] Furthermore, in some embodiments, the maximum value of the width D along the third direction of the insulating member 7 before the fifth bend 71 is formed is 1.2 mm.

[0055] In other words, the width dimension D of the insulating component 7 along the third direction before the fifth bend 71 is formed should be as small as possible, with a maximum D of 1.2mm, i.e., D≤1.2mm. This helps to prevent the insulating component 7 from protruding from the second pit surface 3 along the third direction before the fifth bend 71 is formed, and also helps to prevent the fifth bend 71 formed after the insulating component 7 is bent from protruding from the second pit surface 3.

[0056] In addition, to facilitate bending of the insulating element 7, in some embodiments, the insulating element 7 is made of PP or PE adhesive.

[0057] In other words, this embodiment uses a soft insulating component 7, which makes the insulating component 7 easy to bend and avoids damage due to bending, which helps to improve the service life of the insulating component 7.

[0058] It should be noted that the specific material of the insulating component 7 is not limited in this embodiment of the invention, as long as it can provide insulation and is easy to bend. In some embodiments, the insulating component 7 is PP adhesive or PE adhesive. That is, this embodiment uses soft adhesive to achieve insulation between the tab 1 and the top sealing edge 4, and the soft adhesive can be used to connect the tab 1 and the top sealing edge 4 together, which helps to improve the stability of the position of the tab 1.

[0059] In addition, in some embodiments, the distance from the first pit surface 2 to the side of the top sealing edge 4 closest to the first pit surface 2 is less than the distance from the second pit surface 3 to the side of the top sealing edge 4 closest to the second pit surface 3. That is, the first distance is less than the second distance.

[0060] It should be noted that, according to the conventions of the art, the side seal 5 is usually bent toward the side where the deep pit surface of the battery is located. Therefore, the first pit surface 2 can be called the deep pit surface, and correspondingly, the second pit surface 3 is called the shallow pit surface. In addition, since this application uses a C-PACK structure for the dual-pit battery and bends the top seal 4 toward the side where the second pit surface 3 is located, in order to avoid the top seal 4 protruding from the second pit surface 3 after bending, this embodiment increases the distance from the second pit surface 3 to the side of the top seal 4 near the second pit surface 3, so that the distance from the second pit surface 3 to the side of the top seal 4 near the second pit surface 3 is greater than the distance from the first pit surface 2 to the side of the top seal 4 near the first pit surface 2. That is, although the first pit surface 2 is conventionally called the deep pit surface and the second pit surface 3 is called the shallow pit surface, in this embodiment of the utility model, the depth of the deep pit corresponding to the deep pit surface may be less than the depth of the pit corresponding to the shallow pit surface.

[0061] Of course, in other embodiments, based on other considerations, the distance from the first pit surface 2 to the side of the top sealing edge 4 closest to the first pit surface 2 can be greater than the distance from the second pit surface 3 to the side of the top sealing edge 4 closest to the second pit surface 3, that is, the first distance is greater than the second distance.

[0062] Additionally, it should be noted that the connection method between the top sealing edge 4 and the cell end face 6 is not limited in this embodiment. In some embodiments, an adhesive component 8 (such as...) is provided between the top sealing edge 4 and the cell end face 6. Figure 3 and Figure 8 (As shown).

[0063] In other words, this embodiment utilizes the adhesive 8 to fix the top sealing edge 4 to the cell end face 6, thereby improving the stability of the structure. In some embodiments, after the portion of the side sealing edge 5 extending beyond the cell end face 6 is bent towards the cell end face 6, the adhesive 8 is provided on the side of the top sealing edge 4 facing the second pit surface 3. Then, the top sealing edge 4 is bent towards the side where the second pit surface 3 is located, so that the adhesive 8 is bonded and fixed to the cell end face 6. Furthermore, after the top sealing edge 4 is bent, hot pressing and pressure holding methods can be used to make the top sealing edge 4 and the cell end face 6 more firmly fixed by the adhesive.

[0064] In addition to the battery described above, this utility model also provides an electrical device that includes the battery disclosed in the above embodiments. This embodiment does not limit the specific type of electrical device. For example, the electrical device includes, but is not limited to, mobile phones, laptops, tablets, electric vehicles, electric toys, spacecraft, etc. For the structure of other parts of the electrical device, please refer to the relevant technology, which will not be described in detail here.

[0065] The key point of this embodiment is that the electrical device includes the battery disclosed in any of the above embodiments, and therefore, the electrical device at least includes the beneficial effects of the battery described above.

[0066] It should also be noted that, in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0068] The battery and electrical equipment provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A battery, characterized in that, include: The battery cell has a tab (1) at least one end. A membrane shell covers the outer periphery of the battery cell. The membrane shell includes a first pit surface (2), a second pit surface (3), a top sealing edge (4), and a side sealing edge (5). The side sealing edge (5) includes a first bent portion (51) and a first straight portion (52). The first straight portion (52) is attached to the side of the first pit surface (2) and extends along the thickness direction of the battery cell. The top sealing edge (4) includes a second bent portion (41) and a second straight portion (42). The second straight portion (42) is connected to the battery cell end face (6) of the battery cell through the second bent portion (41). The second straight portion (42) is opposite to the battery cell end face (6). The top sealing edge (4) and The connection point of the cell end face (6) is at a first distance from the first pit surface (2), and the connection point is at a second distance from the second pit surface (3). The portion of the side sealing edge (5) that extends beyond the cell end face (6) includes a third bend (53) and a corner (54). The corner (54) is connected to the first straight portion (52) through the third bend (53). The first part (541) of the corner (54) is located on the side of the top sealing edge (4) away from the cell end face (6), and the second part (542) of the corner (54) is located on the outside of the portion of the cell end face (6) near the first pit surface (2).

2. The battery according to claim 1, characterized in that, The portion of the tab (1) extending beyond the top sealing edge (4) includes a fourth bent portion and a third straight portion, the third straight portion being located on the side of the second straight portion (42) away from the end face (6) of the battery cell.

3. The battery according to claim 2, characterized in that, An insulating element (7) is provided between the electrode tab (1) and the top sealing edge (4), and the insulating element (7) includes a fifth bending portion (71) corresponding to the fourth bending portion.

4. The battery according to claim 3, characterized in that, The distance from the end of the insulating member (7) away from the top sealing edge (4) to the end where the second straight portion (42) connects to the second bent portion (41) is less than or equal to the second distance.

5. The battery according to claim 4, characterized in that, The maximum distance of the top sealing edge (4) from the end connected to the end face (6) of the battery cell to the end away from the end face (6) of the battery cell is A, the second distance is B, the minimum height of the second bent portion (41) along the length direction of the battery cell is C, the distance from the end connected to the top sealing edge (4) of the insulating member (7) to the end away from the top sealing edge (4) of the insulating member (7) is D, and the relationship between A, B, C and D is: A-C+D<B.

6. The battery according to claim 5, characterized in that, The maximum value of D is 1.2 mm.

7. The battery according to claim 3, characterized in that, The insulating component (7) is made of PP glue or PE glue.

8. The battery according to claim 3, characterized in that, The side of the fifth bend (71) facing the second pit surface (3) does not extend beyond the outer side of the second pit surface (3).

9. The battery according to any one of claims 1-8, characterized in that, The first distance is less than the second distance.

10. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1-9.

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