Battery cell, battery and terminal device

Abstract

The utility model relates to technical fields disclose electric core, battery and terminal equipment, electric core includes: electric core subassembly and encapsulation piece, encapsulation piece is constructed and is suitable for accommodating the closed cavity of electric core subassembly, closed cavity has the front and back in the first direction, the first outer side and second outer side in the second direction, and the top surface in the third direction, the first outer side is connected with the cladding part, and the tab of electric core subassembly exposes outside closed cavity through the top surface, the cladding part is bent to the front and is attached to the front, and the part of cladding part protrudes from the top surface in the third direction to the back and is bent to the back and is attached to the back, the utility model uses the encapsulation piece of integrated structure, reduces the quantity of encapsulation part simultaneously, makes the structure of electric core after encapsulation also more compact, the integrity and consistency of outside also better, and the containing space can be formed by the encapsulation piece itself, can settle the protection board, also can improve the insulation reliability of protection board position.

Description

Technical Field

[0001] This utility model relates to the field of battery cells, batteries and terminal equipment. Background Technology

[0002] The insulation performance of a mobile phone battery is one of its most important performance indicators. Proper insulation protects the battery from external environmental factors, reduces battery aging, and thus extends its lifespan. High-quality insulation design helps maintain the battery's stability and reliability under various operating conditions. The insulation performance of a mobile phone battery is not only crucial for the safe operation of the device, but also plays a vital role in improving user experience, protecting the device, and ensuring user safety.

[0003] Currently, in order to improve the insulation performance of batteries, existing batteries are generally wrapped and sealed with insulating tape. The sealing process requires the use of multiple independent insulating tapes to seal different parts of the battery. This sealing method has a large number of insulating tapes and many steps in the sealing process, which makes the sealing process complicated. Utility Model Content

[0004] In view of this, the present invention provides a battery cell, a battery and a terminal device to solve the problem of complex processes in the packaging of existing batteries.

[0005] In a first aspect, the present invention provides a battery cell having a first direction, a second direction, and a third direction intersecting each other, comprising: a battery cell assembly and a package; the package is configured to accommodate a sealed cavity suitable for housing the battery cell assembly, the sealed cavity having a front and a back side in the first direction, a first outer side and a second outer side side in the second direction, and a top surface in the third direction, the first outer side side being connected to a covering portion, the electrode tabs of the battery cell assembly passing through the top surface and exposed outside the sealed cavity; the covering portion is bent toward the front side and fitted to the front side, and the portion of the covering portion protruding from the top surface in the third direction is bent toward the back side and fitted to the back side, thereby defining an accommodating space between the covering portion and the top surface, the electrode tabs and a protective plate being located within the accommodating space.

[0006] Beneficial effects: Using an integrated encapsulation structure, multiple locations of the battery cell assembly can be encapsulated by a single component. This reduces the number of encapsulation components and also reduces the possibility of positional deviations between different encapsulation components. This results in a more compact structure for the encapsulated battery cell assembly, with better external integrity and consistency. In addition, the encapsulation itself can enclose and form a receiving space, eliminating the need for additional encapsulation components. This not only reliably houses the protection board but also improves the insulation reliability at the protection board location, effectively solving the problem of complex processes in existing battery encapsulation methods.

[0007] In one alternative embodiment, the covering portion has a length dimension in the second direction, ranging from 40 to 80 millimeters, and a width dimension in the third direction, ranging from 5 to 15 millimeters.

[0008] Beneficial effects: The encapsulation part has a simple and reliable structure that is easy to process and manufacture. The length and width of the encapsulation part have a large range, which allows for more flexible formation of the required size of the containment space during encapsulation, resulting in high flexibility of use.

[0009] Secondly, this utility model provides a battery having a first direction, a second direction, and a third direction that intersect each other. The battery includes: a cell assembly, a package, and a protection plate. The package is configured to form a sealed cavity suitable for accommodating the cell assembly, forming a top sealing edge on one side in the third direction, and forming a first side sealing edge and a second side sealing edge on both sides in the second direction, respectively. The edge of the first side sealing edge is connected to a covering portion, and the electrode tabs of the cell assembly pass through the top sealing edge and are exposed outside the sealed cavity. The sealed cavity has a front side in the first direction and a... The back side has a first outer side and a second outer side in a second direction, and a top surface in a third direction; a first side seal is bent toward the first outer side and attached to the first outer side, and a second side seal is bent toward the second outer side and attached to the second outer side; a covering portion is bent toward the front and attached to the front, and a portion of the covering portion protruding from the top surface in a third direction is bent toward the back and attached to the back, so as to define an accommodating space between the covering portion and the top surface, the top seal, the tab, and the protective plate are located within the accommodating space, and the protective plate is connected to the tab.

[0010] Beneficial effects: The protective plate 3 can be reliably placed in the containment space 210 formed by the encapsulation component 2 without the need for additional encapsulation components. This reduces the number of components while also improving the integrity and reliability of the encapsulated components. In addition, it can also improve the insulation reliability at the location of the protective plate 3.

[0011] In one optional embodiment, the covering portion includes a connecting layer, a structural layer, and a protective layer stacked sequentially. The protective layer is connected to the side of the structural layer away from the receiving space, and the structural layer is bonded to the back side and the front side respectively through the connecting layer.

[0012] Beneficial effects:

[0013] In one optional embodiment, the covering portion includes a first connecting segment, a second connecting segment, and a third connecting segment. The first connecting segment is connected to a first side seal and a portion of itself is connected to the front side. Along the third direction, the second connecting segment is located on the side of the protection plate away from the battery cell. The third connecting segment is connected to the top seal and the first connecting segment is connected to the second side seal through the second connecting segment.

[0014] Beneficial effects: The covering part has a simple and reliable structure. After being bent and connected, it can form an effective protective cover. The assembly process is convenient and quick.

[0015] In one alternative embodiment, the portion of the second side sealing edge extending from the top surface is a protrusion, and there is a gap between the first connecting section and the protrusion, forming a communication port that communicates with the receiving space; the protective plate has a protrusion that extends out of the receiving space through the communication port, and the protrusion is used to connect with external components.

[0016] Beneficial effects: This type of protection board arrangement allows the extended section to extend directly through the connecting port into the receiving space, making it easier for the protection board to connect with external components. In addition, the extended section extends in the second direction, which avoids the extended section occupying the space on the third direction side of the battery, ensuring the flexibility and convenience of the protection board connection.

[0017] In one alternative implementation, the width of the gap ranges from 0.5 mm to 3 mm.

[0018] Beneficial effect: This type of gap ensures smooth extension of the protruding section even when the opening of the connecting port is small.

[0019] In one alternative embodiment, the distance between the protective plate and the second connecting segment in the third direction ranges from 0.2 mm to 1 mm; and / or, the width of the first connecting segment and the front connecting portion in the third direction is greater than or equal to 1 mm.

[0020] Beneficial effects: The gap between the protection plate and the second connecting segment can form a buffer space. When the second connecting segment is subjected to external force, it can move toward the protection plate and create a depression, preventing foreign objects from directly colliding with the protection plate through the second connecting segment and damaging the protection plate. In addition, this connection method can ensure a reliable connection between the first connecting segment and the front side, thereby reducing the possibility of the first connecting segment falling off and improving the battery packaging reliability.

[0021] In one optional implementation, the second connecting segment is connected to the first connecting segment and the third connecting segment respectively by an arc segment, the radius of which is greater than or equal to 0.3 mm.

[0022] Beneficial effects: The curved section makes the bend smoother and avoids stress concentration.

[0023] Secondly, this utility model also provides a terminal device, which includes: a body having a mounting position; and the aforementioned battery, disposed in the mounting position and connected to the body. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a front view of a battery according to an embodiment of the present utility model when it is not assembled.

[0026] Figure 2 for Figure 1 The front view of the battery after the first and second side seals are bent.

[0027] Figure 3 for Figure 2 The front view of the battery after the protection board is connected to the terminals;

[0028] Figure 4 for Figure 3 The front view of the battery after the protection board causes the tabs to fold and the covering part is bent for the first time.

[0029] Figure 5 for Figure 4 The front view of the battery casing after the second bend;

[0030] Figure 6 for Figure 5 A cross-sectional view of the battery shown from the side;

[0031] Figure 7 for Figure 6 A side view of the battery shown;

[0032] Figure 8 for Figure 7 The diagram shown illustrates the battery without the protection board.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Battery cell assembly; 101. Electrode tab;

[0035] 2. Packaging components;

[0036] 201. Top edge seal; 202. First side edge seal; 203. Second side edge seal; 2031. Protruding part;

[0037] 204. Covering part; 2041. First connecting section; 2042. Second connecting section; 2043. Third connecting section; 2044. Arc-shaped section; 205. Back side; 206. Front side; 207. First outer side surface; 208. Second outer side surface; 209. Top surface;

[0038] 210. Accommodation space; 211. Connecting port;

[0039] 3. Protective plate; 301. Extended section;

[0040] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] According to an embodiment of the present invention, in one aspect, a battery cell is provided, having a first direction X, a second direction Y, and a third direction Z intersecting each other. The battery cell includes: a battery cell assembly 1 and a package 2; the package 2 is configured to accommodate a sealed cavity suitable for housing the battery cell assembly, the sealed cavity having a front surface 206 and a back surface 205 in the first direction X, a first outer surface 207 and a second outer surface 208 in the second direction Y, and a top surface 209 in the third direction Z. The side 207 is connected to the cover 204, and the tab 101 of the battery cell assembly passes through the top surface 209 and is exposed outside the sealed cavity; the cover 204 is bent toward the front 206 and attached to the front 206, and the part of the cover 204 that protrudes from the top surface 209 in the third direction Z is bent toward the back surface 205 and attached to the back surface 205, so as to define an accommodating space 210 between the cover 204 and the top surface 209, and the tab 101 and the protective plate 3 are located in the accommodating space 210.

[0043] The battery cell of this embodiment uses an integrated package 2. Multiple positions of the battery cell assembly 1 can be packaged by a single component of the package 2. This reduces the number of packaging components and also reduces the possibility of positional deviation between different packaging components. This makes the battery cell assembly 1 more compact after packaging, and the external integrity and consistency are better. In addition, the package 2 itself can enclose and form a receiving space 210 without the need for additional packaging components. While reliably placing the protection board 3, it can also improve the insulation reliability at the position of the protection board 3, effectively solving the problem of complex processes in the packaging method of existing batteries.

[0044] In one possible implementation, the covering portion 204 has a length dimension in the second direction Y, ranging from 40 to 80 mm, and a width dimension in the third direction Z, ranging from 5 to 15 mm. The covering portion 204 has a simple, reliable structure that is easy to process and manufacture. The covering portion 204 has a large range of length and width, which allows for more flexible formation of the required size of the accommodating space 210 during encapsulation, resulting in high flexibility in use.

[0045] It should be noted that, for example Figure 1 As shown, the length and width dimensions here refer to the dimensions of the covering part 204 when it is in the fully open state.

[0046] Specifically, the length and width of the covering part 204 are not limited. The length can be 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, etc., and the width can be 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, etc., which can be selected according to the size of the battery cell assembly 1.

[0047] According to an embodiment of the present invention, a battery is provided having a first direction X, a second direction Y and a third direction Z intersecting in pairs, comprising: a cell assembly 1, a package 2 and a protection plate 3;

[0048] The package 2 is constructed to accommodate a sealed cavity for the battery cell assembly. A top sealing edge 201 is formed on one side in the third direction Z, and a first side sealing edge 202 and a second side sealing edge 203 are formed on both sides in the second direction Y. The edge of the first side sealing edge 202 is connected to a covering part 204. The tab 101 of the battery cell assembly passes through the top sealing edge 201 and is exposed outside the sealed cavity.

[0049] The sealed cavity has a front surface 206 and a back surface 205 in the first direction X, a first outer surface 207 and a second outer surface 208 in the second direction Y, and a top surface 209 in the third direction Z.

[0050] The first side sealing edge 202 is bent toward the first outer side surface 207 and attached to the first outer side surface 207, and the second side sealing edge 203 is bent toward the second outer side surface 208 and attached to the second outer side surface 208.

[0051] The covering portion 204 is bent towards and adheres to the front surface 206, and the portion of the covering portion 204 that protrudes from the top surface 209 in the third direction Z is bent towards and adheres to the back surface 205, thereby defining an accommodating space 210 between the covering portion 204 and the top surface 209. The top sealing edge 201, the tab 101, and the protective plate 3 are located within the accommodating space 210, and the protective plate 3 is connected to the tab 101.

[0052] The battery using this embodiment can reliably house the protection plate 3 by enclosing the containment space 210 formed by the encapsulation component 2, without the need for additional encapsulation components. This reduces the number of components while maintaining high integrity and reliability after encapsulation. In addition, it can improve the insulation reliability at the location of the protection plate 3, effectively solving the problem of complex processes in existing battery encapsulation methods.

[0053] In related technologies, multiple independent insulating tapes are used to encapsulate different positions of the battery. Inevitably, relative positional deviations will occur when different insulating tapes are used for encapsulation, resulting in poor encapsulation consistency of the battery after encapsulation. However, the encapsulation method used in the battery of this embodiment can effectively avoid this problem.

[0054] It should be noted that, in this embodiment, the first direction X refers to Figure 6 The direction indicated by the middle arrow "X" is also the direction of the battery's thickness; the second direction Y refers to... Figure 1 The direction indicated by the middle arrow, "Y," is also the width direction of the battery; the third direction, Z, refers to... Figure 1 and Figure 6 The direction of the "Z" indicated by the middle arrow is also the length direction of the battery.

[0055] Specifically, the accommodating space 210 does not refer to a completely enclosed space, but rather to the space enclosed by the top surface 209, the first side seal 202, the second side seal 203, and the covering part 204.

[0056] Furthermore, the material of the encapsulation component 2 is preferably an aluminum-plastic composite film. It can be understood that the material of the encapsulation component 2 can also be a polymer film or composite material with thinness, flexibility and barrier function, which can be flexibly selected according to the needs.

[0057] Additionally, it should be noted that, as Figure 1 The diagram shows the top sealing edge 201 of the package 2 and the battery cell assembly 1 after encapsulation. At this time, the package 2 is in an unfolded planar state. The battery cell assembly 1 is not a completely exposed bare cell. Except for the side where the top sealing edge 201 is located, the rest of the external surface is covered by an aluminum-plastic composite film. The battery state at this time is: the battery cell assembly 1 is in the state after being heat-pressed and encapsulated with its own aluminum-plastic composite film and the top sealing edge 201. At this time, the top surface 209 is covered by an aluminum-plastic composite film.

[0058] It is understandable that, as an alternative implementation method, the battery cell assembly 1 can also be a bare battery cell if required.

[0059] In one possible implementation, the covering part 204 includes a connecting layer, a structural layer and a protective layer stacked in sequence. The protective layer is connected to the side of the structural layer away from the receiving space 210. The structural layer is bonded to the back side 205 and the front side 206 respectively through the connecting layer. This type of covering part 204 has a simple structure, which can form protection while being directly connected to the back side 205 and the front side 206 through its own connecting layer, without the need for additional connecting parts, which can effectively improve the ease of assembly.

[0060] Specifically, the covering part 204 is an aluminum-plastic film. The structural layer mainly plays a supporting role, while the protective layer mainly plays a protective role on the outside. The bonding step can be carried out after the connecting layer is heated and melted.

[0061] In one possible implementation, such as Figure 6 As shown, the covering part 204 includes a first connecting section 2041, a second connecting section 2042, and a third connecting section 2043. The first connecting section 2041 is connected to the first side sealing edge 202 and a portion of itself is connected to the front side 206 along the third direction Z. The second connecting section 2042 is located on the side of the protection plate 3 away from the cell assembly 1. The third connecting section 2043 is connected to the top sealing edge 201. The first connecting section 2041 is connected to the second side sealing edge 203 through the second connecting section 2042. The covering part 204 has a simple and reliable structure. After bending and connecting itself, it can form a structure that effectively covers the protection plate 3. The assembly process is convenient and quick.

[0062] Specifically, such as Figure 6 As shown, the covering part 204 bends on both sides. The first bend occurs at the connection position of the first connecting segment 2041 and the second connecting segment 2042, and the second bend occurs at the connection position of the second connecting segment 2042 and the third connecting segment 2043. The bending angle of the bending position is not limited and can be a right angle or a rounded angle, which can be flexibly selected according to the requirements.

[0063] Additionally, it should be noted that, as an alternative implementation, the covering portion 204 can also be bent into an arch shape as a whole, as long as the shape of the first side sealing edge 202 and the second side sealing edge 203 extending from the top surface 209 2031 matches the shape of the openings at both ends of the covering portion 204 along the second direction Y.

[0064] In one possible implementation, such as Figure 7As shown, the portion of the second side sealing edge 203 extending from the top surface 209 is the protrusion 2031. A gap exists between the first connecting section 2041 and the protrusion 2031, forming a communication port 211 that connects to the receiving space 210. The protective plate 3 has a protrusion 301 that extends out of the receiving space 210 through the communication port 211, and is used for connection to external components. This arrangement of the protective plate 3 allows the protrusion 301 to directly extend out of the receiving space 210 through the communication port 211, facilitating connection between the protective plate 3 and external components. Furthermore, the protrusion 301 extends along the second direction Y, avoiding the protrusion 301 occupying space on the third direction Z side of the battery, thus ensuring the flexibility and convenience of connecting the protective plate 3.

[0065] Specifically, such as Figure 8 As shown, the gap is mainly formed by the shortening of the protrusion 2031 itself, so that the opening direction of the communication port 211 is oriented towards the second direction Y.

[0066] It is understood that, as an alternative implementation, the gap can also be shortened by the first connecting segment 2041, in which case the opening direction of the connecting port 211 is oriented toward the first direction X.

[0067] In one possible implementation, such as Figure 8 As shown, the width of the gap ranges from 0.5mm to 3mm. This type of gap ensures that the extension section 301 can extend smoothly even when the opening of the connecting port 211 is small.

[0068] Specifically, such as Figure 8 As shown, the dimension at point A is the width of the gap. The width of the gap can be 0.8mm, 1mm, 1.5mm, 2mm, etc., which can be selected according to the requirements.

[0069] In one possible implementation, such as Figure 6 As shown, along the third direction Z, the distance between the protective plate 3 and the second connecting segment 2042 ranges from 0.2mm to 1mm. The gap between the protective plate 3 and the second connecting segment 2042 can form a buffer space. When the second connecting segment 2042 is subjected to external force, it can move toward the protective plate 3 and create a depression, preventing foreign objects from directly colliding with the protective plate 3 through the second connecting segment 2042 and damaging the protective plate 3.

[0070] Specifically, such as Figure 6 As shown, the dimension at point B is the distance between the protective plate 3 and the second connecting section 2042. This distance can be 0.2mm, 0.5mm, 0.8mm, or 1mm, etc. The specific value can be selected according to the requirements.

[0071] In one possible implementation, such as Figure 6As shown, the second connecting segment 2042 is connected to the first connecting segment 2041 and the third connecting segment 2043 respectively through the arc segment 2044. The radius of the arc segment 2044 is greater than or equal to 0.3mm. The curved segment 2044 makes the bending part smoother and avoids stress concentration.

[0072] Specifically, such as Figure 6 As shown, the dimension at point C is the radius range of arc segment 2044. The radius of arc segment 2044 can be 0.3mm, 0.5mm, or 0.7mm, etc., and can be flexibly selected according to requirements.

[0073] In one possible implementation, such as Figure 6 As shown, along the third direction Z, the width of the connection between the first connecting segment 2041 and the front face 206 is greater than or equal to 1mm. This connection method can ensure a reliable connection between the first connecting segment 2041 and the front face 206, thereby reducing the possibility of the first connecting segment 2041 falling off and improving the packaging reliability of the battery.

[0074] Specifically, such as Figure 6 As shown, the dimension at point D is the width of the connection between the first connecting segment 2041 and the front 206. The dimension at this position can be 1mm, 3mm, 5mm, 10mm, etc., and can be flexibly selected according to the requirements.

[0075] In one possible implementation, the first side sealing edge 202 and the second side sealing edge 203 are bonded to the battery cell assembly 1, and the connection method is simple and reliable.

[0076] In one possible implementation, such as Figure 6 As shown, along the third direction Z, the top sealing edge 201 extends from the top surface 209, and the electrode tab 101 passes through the top sealing edge 201 along the third direction Z and is electrically connected to the protection plate 3. In this arrangement of the electrode tab 101, the top sealing edge 201 can not only effectively support the electrode tab 101 and prevent the electrode tab 101 from bending at will, but also effectively improve the insulation reliability of the electrode tab 101.

[0077] It is understood that, as an alternative implementation, the tab 101 may also extend directly from the cell assembly 1 into the receiving space 210.

[0078] The following describes the battery packaging process of this embodiment:

[0079] like Figure 1 As shown, after the aluminum-plastic film on the surface of the battery cell assembly 1 is heat-pressed onto the encapsulation component 2, the encapsulation component 2 is cut to form a first side seal 202, a second side seal 203, and a covering part 204.

[0080] like Figure 2As shown, after bending the first side sealing edge 202 and the second side sealing edge 203 by 90 degrees, they are attached tightly to the side of the main body of the battery cell assembly 1 and then glued together.

[0081] like Figure 3 As shown, the protection board 3 is spot-welded to the tab 101 of the battery cell assembly 1;

[0082] like Figure 4 As shown, the protective plate 3 is folded towards the side where the front 206 is located, close to the cell assembly 1, the covering part 204 is folded towards the front 206, and the covering part 204 is heat-sealed to the front 206.

[0083] like Figure 5 As shown, after bending the covering part 204 toward the top sealing edge 201, the third connecting section 2043 of the covering part 204 is heat-sealed to the top sealing edge 201 to complete the battery encapsulation.

[0084] According to an embodiment of the present invention, in another aspect, a terminal device is provided, comprising: a body and the aforementioned battery, the body having a mounting position, the battery being disposed in the mounting position and connected to the body.

[0085] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An electric core having a first direction (X), a second direction (Y), and a third direction (Z) that intersect two by two, characterized in that, include: Battery cell assembly (1) and package (2); The encapsulation (2) is configured to accommodate a sealed cavity for housing the battery cell assembly. The sealed cavity has a front (206) and a back (205) in a first direction (X), a first outer side (207) and a second outer side (208) in a second direction (Y), and a top surface (209) in a third direction (Z). The first outer side (207) is connected to a cover (204), and the tab (101) of the battery cell assembly passes through the top surface (209) and is exposed outside the sealed cavity. The covering portion (204) is bent toward the front surface (206) and fitted to the front surface (206), and the portion of the covering portion (204) protruding from the top surface (209) in the third direction (Z) is bent toward the back surface (205) and fitted to the back surface (205) to define an accommodating space (210) between the covering portion (204) and the top surface (209), and the tab (101) and the protective plate (3) are located within the accommodating space (210).

2. The electric cell of claim 1, wherein, The covering portion (204) has a length dimension in the second direction (Y) ranging from 40 to 80 millimeters, and the covering portion (204) has a width dimension in the third direction (Z) ranging from 5 to 15 millimeters.

3. A battery having a first direction (X), a second direction (Y) and a third direction (Z) intersecting each other two by two, characterized in that, include: Battery cell assembly (1), package (2), and protection board (3); The package (2) is configured to accommodate a sealed cavity for housing the battery cell assembly. A top sealing edge (201) is formed on one side in the third direction (Z), and a first side sealing edge (202) and a second side sealing edge (203) are formed on both sides in the second direction (Y). The edge of the first side sealing edge (202) is connected to a covering portion (204). The tab (101) of the battery cell assembly passes through the top sealing edge (201) and is exposed outside the sealed cavity. The sealed cavity has a front (206) and a back (205) in a first direction (X), a first outer side (207) and a second outer side (208) in a second direction (Y), and a top surface (209) in a third direction (Z). The first side sealing edge (202) is bent toward the first outer side surface (207) and attached to the first outer side surface (207), and the second side sealing edge (203) is bent toward the second outer side surface (208) and attached to the second outer side surface (208); The covering part (204) is bent toward the front side (206) and attached to the front side (206), and the portion of the covering part (204) protruding from the top surface (209) in the third direction (Z) is bent toward the back side (205) and attached to the back side (205) to define an accommodating space (210) between the covering part (204) and the top surface (209). The top sealing edge (201), the tab (101) and the protective plate (3) are located in the accommodating space (210), and the protective plate (3) is connected to the tab (101).

4. The battery of claim 3, wherein, The covering part (204) includes a connecting layer, a structural layer and a protective layer stacked in sequence. The protective layer is connected to the side of the structural layer away from the receiving space (210). The structural layer is bonded to the back side (205) and the front side (206) respectively through the connecting layer.

5. The battery of claim 3, wherein, The covering part (204) includes a first connecting section (2041), a second connecting section (2042) and a third connecting section (2043). The first connecting section (2041) is connected to the first side sealing edge (202) and a portion of itself is connected to the front side (206) along the third direction (Z). The second connecting section (2042) is located on the side of the protective plate (3) away from the cell assembly (1). The third connecting section (2043) is connected to the top sealing edge (201). The first connecting section (2041) is connected to the third connecting section (2043) through the second connecting section (2042).

6. The battery of claim 5, wherein, The portion of the second side seal (203) extending from the top surface (209) is a protrusion (2031), and there is a gap between the first connecting section (2041) and the protrusion (2031), which forms a communication opening (211) communicating with the receiving space (210); The protective plate (3) has an extension section (301) that extends out of the receiving space (210) through the communication port (211) and is used to connect with external components.

7. The battery of claim 6, wherein, The width of the gap ranges from 0.5 mm to 3 mm.

8. The battery of any one of claims 5-7, wherein, Along the third direction (Z), the distance between the protective plate (3) and the second connecting segment (2042) ranges from 0.2 mm to 1 mm; And / or, along the third direction (Z), the width of the connection portion between the first connecting segment (2041) and the front face (206) is greater than or equal to 1 mm.

9. The battery of any one of claims 5-7, wherein, The second connecting segment (2042) is connected to the first connecting segment (2041) and the third connecting segment (2043) respectively through an arc segment (2044), the radius of which is greater than or equal to 0.3mm.

10. A terminal device, comprising: include: The fuselage has mounting positions; The battery cell according to claim 1 or 2 is disposed at the mounting position and connected to the housing; Alternatively, the battery according to any one of claims 3 to 9 is disposed in the mounting position and connected to the body.

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