Secondary battery and terminal device

Abstract

The utility model relates to the technical field of energy storage, in particular to a secondary battery and terminal equipment. The secondary battery comprises an electrode assembly, a shell, a tab, a circuit board assembly and a coating piece, the case includes a main body portion accommodating the electrode assembly and having a top wall, a bottom wall and a side wall, and a packaging portion including a top sealing portion connected to the top wall and a side sealing portion connected to the side wall. The tab is provided with a connecting part connected with the electrode assembly and an extending part extending out of the top sealing part, and the extending part is connected with a first circuit board of the circuit board assembly. The wrapping part comprises a first wrapping part and a second wrapping part, the first wrapping part wraps the top wall, the top sealing part, the extending part and the first circuit board, and the second wrapping part wraps the bottom wall. A first groove and a second groove are formed in the surfaces, in the third direction, of the first wrapping piece and the second wrapping piece correspondingly. According to the structure, the detachable connection with the terminal equipment is realized through the groove design, and meanwhile, the shell is protected by utilizing the coating piece, so that the safety performance of the soft package battery is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to a secondary battery and a terminal device. BACKGROUND

[0002] With the continuous change of the application market of personal mobile terminal devices, the demand for capacity of the battery of the terminal device is continuously increasing, and the battery of the personal mobile terminal device is usually in the form of a soft package battery. In some countries or regions, the soft package battery of the personal mobile terminal device is required to be detachable by personal users. For this purpose, the related technology usually uses double-sided adhesive tape to fix the soft package battery in the battery compartment of the terminal device. When the soft package battery needs to be detached, the soft package battery is directly torn off from the battery compartment. This detachment method can cause damage to the shell of the soft package battery, affecting the safety of the soft package battery. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a secondary battery and a terminal device, which can improve the safety of the detachable soft package battery.

[0004] In a first aspect, an embodiment of the present application provides a secondary battery, which comprises an electrode assembly, a shell, a tab, a circuit board assembly, and a cladding. The shell comprises a main body and an encapsulation part, and the electrode assembly is accommodated in the main body. The main body has a top wall, a bottom wall, and a side wall, the top wall and the bottom wall are respectively located on both sides of the main body along a first direction, and the side wall connects the top wall and the bottom wall. The encapsulation part comprises a top encapsulation part and a side encapsulation part, the top encapsulation part is connected with the top wall, and the side encapsulation part is connected with the side wall. The tab comprises a connecting part and a protruding part connected with each other, the connecting part is connected with the electrode assembly, and the protruding part protrudes from the top encapsulation part. The circuit board assembly comprises a first circuit board, and the first circuit board is connected with the protruding part. The cladding comprises a first cladding and a second cladding, the first cladding clads the top wall, the top encapsulation part, the protruding part, and the first circuit board, and the second cladding clads the bottom wall. A first groove is arranged on the surface of the first cladding along a third direction, a second groove is arranged on the surface of the second cladding along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0005] By using the first cladding to clad the top wall, the top encapsulation part, the protruding part, and the first circuit board, and the second cladding to clad the bottom wall, the first groove is arranged on the surface of the first cladding along the third direction, and the second groove is arranged on the surface of the second cladding along the third direction, that is, the first groove and the second groove can be detachably connected with the terminal device. The shell is protected by the first cladding and the second cladding, thereby improving the safety of the soft package battery.

[0006] In one of the above embodiments, the packaging portion further comprises a top edge connecting portion, the top sealing portion is arranged along the first direction with the top wall, the side sealing portion is arranged along the second direction with the side wall, the top edge connecting portion is connected with the side sealing portion and the top sealing portion, the top sealing portion and the top edge connecting portion form a containing space, the first circuit board is contained in the containing space, and the first covering member covers the top edge connecting portion.

[0007] The top sealing portion and the top edge connecting portion form a containing space, by arranging the top sealing portion along the first direction with the top wall, the top edge connecting portion and the first circuit board can share the space of the secondary battery in the first direction, thereby improving the energy density of the secondary battery.

[0008] In one or more of the above embodiments, the first recess comprises a first wall surface, a second wall surface, a third wall surface, and a fourth wall surface, the first wall surface and the second wall surface are arranged along the second direction, the third wall surface is at least partially perpendicular to the first direction, and the fourth wall surface is at least partially perpendicular to the third direction.

[0009] The first wall surface, the second wall surface, the third wall surface, and the fourth wall surface together form the first recess for snap-fitting with the terminal device, thereby providing a stable installation basis for the secondary battery.

[0010] In one or more of the above embodiments, the second recess comprises a fifth wall surface and a sixth wall surface, the fifth wall surface is at least partially perpendicular to the first direction, and the sixth wall surface is at least partially perpendicular to the third direction.

[0011] The fifth wall surface and the sixth wall surface together form the second recess for snap-fitting with the terminal device, thereby providing a stable installation basis for the secondary battery.

[0012] In one or more of the above embodiments, the secondary battery further comprises a first protective film, the first protective film covers and bonds the main body portion and the second covering member, the second recess comprises an exposed portion, and the exposed portion is exposed to the second covering member.

[0013] The first protective film covers and bonds the main body portion and the second covering member, which on one hand can strengthen the connection between the main body portion and the second covering member, and on the other hand can protect the surfaces of the main body portion and the second covering member, thereby improving the problem of scratching the main body portion and the second covering member.

[0014] In one or more of the above embodiments, the first protective film comprises a first protective portion, a second protective portion, and a third protective portion, the main body portion further has a first large surface and a second large surface oppositely arranged along the third direction, the first large surface and the second large surface are respectively connected with the top wall, the bottom wall, and the side wall, the first protective portion covers the first large surface, the third protective portion covers the second large surface, the second protective portion covers the second covering member, and the exposed portion is located at both ends of the second covering member along the second direction.

[0015] The first protection part covers the first large face, the third protection part covers the second large face, and the second protection part covers the second covering piece, so that the second covering piece is wrapped by the first protection film, and the connection stability of the second covering piece and the bottom wall is improved. The exposed part is located at both ends of the second covering piece in the second direction, which is beneficial to improving the balance of the secondary battery in the second direction when the exposed part is clamped and fixed with the terminal equipment.

[0016] In one or more of the above embodiments, the secondary battery further comprises a second protection film and a third protection film, and the second protection film covers the bottom wall. The second covering piece comprises an inner covering part and an outer covering part, the inner covering part covers the second protection film, and the third protection film covers the inner covering part. The outer covering part covers the third protection film, and the second groove is arranged on the outer covering part.

[0017] Compared with the second covering piece being directly connected with the bottom wall, the second protection film covers the bottom wall first, and then the inner covering part covers the second protection film, so as to improve the connection strength of the inner covering part and the bottom wall. The third protection film covers the inner covering part, and the outer covering part covers the third protection film, further improving the connection strength of the second covering piece and the bottom wall.

[0018] In one or more of the above embodiments, the secondary battery further comprises a support frame, which is connected to the bottom wall in the first direction, and the support frame is provided with a through hole. The second covering piece covers the bottom wall and the support frame, and part of the second covering piece is located in the through hole.

[0019] The second covering piece is located in the through hole, and the support frame is connected to the bottom wall. By arranging the support frame, the connection area of the second covering piece and the bottom wall and the support frame is increased, and the connection strength of the second covering piece and the bottom wall is improved.

[0020] In one or more of the above embodiments, the secondary battery further comprises an adhesive piece connected to the bottom wall, and the second covering piece covers the bottom wall and the adhesive piece.

[0021] The adhesive piece can adhere the bottom wall and the second covering piece, thereby improving the connection strength of the second covering piece and the bottom wall.

[0022] In one or more of the above embodiments, the adhesive piece is provided with a groove on the side surface in the third direction, and the groove is provided with a plurality of grooves.

[0023] The adhesive piece is provided with a plurality of grooves on the side surface in the third direction, which is beneficial to increasing the contact area of the adhesive piece and the second covering piece, so as to improve the connection strength of the second covering piece and the bottom wall.

[0024] In one or more of the above embodiments, the secondary battery further comprises a plurality of adhesive bosses, which are arranged at intervals in the second direction and connected to the bottom wall. In the first direction, the plurality of adhesive bosses extend away from the main body part in the first direction, and the second covering piece covers the bottom wall and the plurality of adhesive bosses.

[0025] The plurality of adhesive bosses are arranged at intervals along the second direction and connected to the bottom wall, so that the connection strength between the second cover member and the bottom wall is improved by the adhesive bosses.

[0026] In one or more of the embodiments above, the second cover member includes an inner cover portion and an outer cover portion, the inner cover portion covers the bottom wall, along the first direction, the inner cover portion includes an inner cover body and a clamping structure, the clamping structure is arranged on an end face of the inner cover body away from the main body portion, the outer cover portion covers the clamping structure, the clamping structure has a limiting groove, and the outer cover portion is partially located in the limiting groove to form an interlocking structure.

[0027] The outer cover portion covers the clamping structure and forms the interlocking structure to improve the connection strength between the second cover member and the bottom wall.

[0028] In one or more of the embodiments above, the clamping structure includes a connecting portion and a clamping portion, the connecting portion connects the inner cover body and the clamping portion. Along the second direction, the average thickness of the connecting portion is less than the average thickness of the clamping portion to form the limiting groove, and the second direction is perpendicular to the first direction.

[0029] Along the second direction, the average thickness of the connecting portion is less than the average thickness of the clamping portion, so that after the outer cover portion covers the connecting portion and the clamping portion, the clamping portion can form clamping limiting to the outer cover portion, thereby improving the connection strength between the second cover member and the bottom wall.

[0030] In one or more of the embodiments above, the clamping structure includes a connecting portion and a clamping portion, the connecting portion connects the inner cover body and the clamping portion. Along the third direction, the average thickness of the connecting portion is less than the average thickness of the clamping portion to form the limiting groove, and the third direction is perpendicular to the second direction.

[0031] Along the third direction, the average thickness of the connecting portion is less than the average thickness of the clamping portion, so that after the outer cover portion covers the connecting portion and the clamping portion, the clamping portion can form clamping limiting to the outer cover portion, thereby improving the connection strength between the second cover member and the bottom wall.

[0032] In one or more of the embodiments above, the packaging portion further includes a bottom sealing portion and a bottom sealing edge connecting portion, the bottom sealing portion is connected to the bottom wall and arranged along the first direction, and the bottom sealing edge connecting portion is connected to the side sealing portion and the bottom sealing portion, and the second cover member covers the bottom wall, the bottom sealing portion, and the bottom sealing edge connecting portion.

[0033] By arranging the edge of the tail portion of the secondary battery, the bottom sealing portion is connected to the bottom wall and arranged along the first direction, the bottom sealing edge connecting portion is connected to the side sealing portion and the bottom sealing portion, and the second cover member covers the bottom wall, the bottom sealing portion, and the bottom sealing edge connecting portion, thereby greatly improving the connection strength between the second cover member and the bottom wall, the bottom sealing portion, and the bottom sealing edge connecting portion.

[0034] In one or more of the embodiments above, the side wall includes a first side wall and a second side wall, the first side wall and the second side wall are respectively located on two sides of the main body along the second direction, the side sealing portion includes a first side sealing portion and a second side sealing portion, the first side sealing portion is connected to the first side wall and arranged along the second direction with the first side wall, and the second side sealing portion is connected to the second side wall and arranged along the second direction with the second side wall. The covering member further includes a third covering member, the third covering member is connected to the first covering member and the second covering member, and covers the second side wall and the second side sealing portion.

[0035] In one or more of the embodiments above, the side wall includes a first side wall and a second side wall, the first side wall and the second side wall are respectively located on two sides of the main body along the second direction, the side sealing portion includes a first side sealing portion and a second side sealing portion, the first side sealing portion is connected to the first side wall and arranged along the second direction with the first side wall, and the second side sealing portion is connected to the second side wall and arranged along the second direction with the second side wall. The covering member further includes a third covering member, the third covering member is connected to the first covering member and the second covering member, and covers the second side wall and the second side sealing portion.

[0036] By connecting the first covering member and the second covering member through the third covering member, the first covering member and the second covering member can be pulled towards the main body through the third covering member, thereby improving the connection stability of the first covering member and the second covering member with the main body.

[0037] In a second aspect, the embodiments of the present application provide a terminal device, including a device main body, a terminal rear cover, and a secondary battery in one or more of the above embodiments, the device main body has a battery compartment, the secondary battery is located in the battery compartment, the terminal rear cover is connected to the device main body and covers the battery compartment, the terminal rear cover is provided with a limiting structure, and the first groove and the second groove cooperate with the limiting structure to fix the position of the secondary battery.

[0038] By using the first covering member to cover the top wall, the top sealing portion, the protruding portion and the first circuit board, and the second covering member to cover the bottom wall, the surface of the first covering member along the third direction is provided with the first groove, and the surface of the second covering member along the third direction is provided with the second groove, that is, the first groove and the second groove can be detachably connected with the terminal device, thereby improving the disassembly convenience of the soft package battery. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is the overall structure diagram of the secondary battery in an embodiment of the present application.

[0040] Figure 2 is the side sectional view of the secondary battery in an embodiment of the present application.

[0041] Figure 3 is the structure explosion diagram of the secondary battery in an embodiment of the present application.

[0042] Figure 4 is a front view of a secondary battery without a cover in one embodiment of the present application.

[0043] Figure 5 is Figure 1 is a structure enlarged view of part A in

[0044] Figure 6 is Figure 1 is a structure enlarged view of part B in

[0045] Figure 7 is a schematic view of the overall structure of a secondary battery in another embodiment of the present application.

[0046] Figure 8 is a side sectional view of a secondary battery in another embodiment of the present application.

[0047] Figure 9 is a schematic view of the overall structure of a secondary battery in another embodiment of the present application.

[0048] Figure 10 is a side sectional view of a secondary battery in another embodiment of the present application.

[0049] Figure 11 is a schematic view of the connection structure of a support frame and a bottom wall in one embodiment of the present application.

[0050] Figure 12 is a schematic view of the connection structure of an adhesive member and a bottom wall in one embodiment of the present application.

[0051] Figure 13 is a schematic view of the connection structure of an adhesive boss and a bottom wall in one embodiment of the present application.

[0052] Figure 14 is a schematic view of the connection structure of a clamping structure and a bottom wall in one embodiment of the present application.

[0053] Figure 15 is a side sectional view of a secondary battery in one embodiment of the present application.

[0054] Figure 16 is a schematic view of the overall structure of a secondary battery in another embodiment of the present application.

[0055] Figure 17 is a schematic view of the overall structure of a secondary battery in another embodiment of the present application.

[0056] Figure 18 is a schematic view of the overall structure of a secondary battery in another embodiment of the present application.

[0057] Figure 19 is a schematic view of the structure of a terminal device in one embodiment of the present application.

[0058] Main element symbol explanation

[0059] 001, secondary battery; 100, electrode assembly; 200, case;

[0060] 210, main body part; 211, top wall; 212, bottom wall;

[0061] 213, side wall; 2131, first side wall; 2132, second side wall;

[0062] 214, first large face; 215, second large face; 220, packaging part;

[0063] 221, top sealing part; 222, side sealing part; 2221, first side sealing part;

[0064] 2222, second side sealing part; 223, top edge connecting part; 224, accommodation space;

[0065] 225, bottom sealing part; 226, bottom edge connecting part; 300, tab;

[0066] 310, built-in part; 320, protruding part; 400, circuit board assembly;

[0067] 411, first circuit board; 412, electronic element; 413, second circuit board;

[0068] 500, covering member; 510, first covering member; 511, first recess;

[0069] 5111, first wall surface; 5112, second wall surface; 5113, third wall surface;

[0070] 5114, fourth wall surface; 5115, circular arc transition surface; 520, second covering member;

[0071] 523, second recess; 5231, fifth wall surface; 5232, sixth wall surface;

[0072] 5233, exposed part; 521, inner covering part; 5211, clamping structure;

[0073] 5212, inner covering body; 5211a, limiting groove; 5211b, connecting part;

[0074] 5211c, clamping part; 522, outer covering part; 530, third covering member;

[0075] 600, first protection film; 610, first protection part; 620, second protection part;

[0076] 630, third protection part; 700, second protection film; 800, third protection film;

[0077] 910, support frame; 911, through hole; 912, first support part;

[0078] 913, second support part; 914, third support part; 915, fourth support part;

[0079] 920, adhesive member; 921, groove; 930, adhesive boss;

[0080] 002, terminal device; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0081] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0082] It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected. When a component is considered to be "connected" to another component, it can be directly connected to another component or there can be a middle component. When a component is considered to be "provided on" another component, it can be directly provided on another component or there can be a middle component.

[0083] Unless otherwise specified, the term "a plurality of" as used herein refers to two or more.

[0084] The terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implying the number, specific order or primary and secondary relationship of the indicated technical features.

[0085] The term "vertical" is used to describe the ideal state between two components. In the actual production or use state, there can be an approximate vertical state between the two components. For example, in combination with numerical description, vertical can refer to the included angle between two straight lines in the range of 90°±10°, vertical can also refer to the dihedral angle between two planes in the range of 90°±10°, and vertical can also refer to the included angle between a straight line and a plane in the range of 90°±10°.

[0086] The term "parallel" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately parallel. For example, in numerical terms, parallel can refer to the angle between two straight lines within the range of 180° ± 10°, the dihedral angle between two planes within the range of 180° ± 10°, or the angle between a straight line and a plane within the range of 180° ± 10°.

[0087] It should be noted that when a parameter is greater than, equal to or less than a certain endpoint value, it should be understood that the endpoint value is allowed to have a tolerance of ±5%.

[0088] It should be understood that the dimensions of the structures shown in the accompanying drawings are provided for better understanding and easier description, and this application is not limited to the dimensions shown in the drawings. For the sake of clarity, elements unrelated to the description have been omitted from the details of this specification.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0090] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the embodiments and features described below can be combined with each other.

[0091] Please see Figure 1 and Figure 2 One embodiment of this application provides a secondary battery 001, including an electrode assembly 100, a housing 200, tabs 300, a circuit board assembly 400, and a cover 500. The housing 200 includes a main body portion 210 and an encapsulation portion 220, and the electrode assembly 100 is housed in the main body portion 210.

[0092] Please see Figure 3 and Figure 4 The main body 210 has a top wall 211, a bottom wall 212 and a side wall 213. The top wall 211 and the bottom wall 212 are located on both sides of the main body 210 along the first direction X, and the side wall 213 connects the top wall 211 and the bottom wall 212.

[0093] The encapsulation portion 220 includes a top seal portion 221 and a side seal portion 222. The top seal portion 221 is connected to the top wall 211, and the side seal portion 222 is connected to the side wall 213. The electrode tab 300 includes a connected built-in portion 310 and a protruding portion 320. The built-in portion 310 is connected to the electrode assembly 100, and the protruding portion 320 extends from the top seal portion 221.

[0094] Please see Figure 2 andFigure 4 In some embodiments, the circuit board assembly 400 comprises a first circuit board 411, and the first circuit board 411 is connected to the extension 320.

[0095] In some embodiments, the first circuit board 411 is a rigid printed circuit board (PCB).

[0096] In some other embodiments, the first circuit board 411 is a flexible printed circuit board (FPC).

[0097] In some embodiments, the circuit board assembly 400 comprises electronic components 412, and the electronic components 412 are arranged on the surface of the first circuit board 411 facing the top wall 211.

[0098] In some other embodiments, the electronic components 412 are arranged on the surface of the first circuit board 411 away from the top wall 211.

[0099] In some embodiments, the circuit board assembly 400 further comprises a second circuit board 413, and the second circuit board 413 is connected to the first circuit board 411, and the second circuit board 413 is configured to be connected to an external circuit.

[0100] In some embodiments, the second circuit board 413 is a flexible printed circuit board (FPC.

[0101] Please refer to Figure 1 , Figure 3 and Figure 4 In some embodiments, the cover 500 comprises a first cover 510 and a second cover 520. The first cover 510 covers the top wall 211, the top sealing portion 221, the extension 320 and the first circuit board 411, and the second cover 520 covers the bottom wall 212.

[0102] The surface of the first cover 510 along the third direction Z is provided with a first groove 511, and the surface of the second cover 520 along the third direction Z is provided with a second groove 523, that is, the first groove 511 and the second groove 523 can be detachably connected to the terminal device 002. At the same time, the first cover 510 and the second cover 520 protect the shell 200 and the circuit board assembly 400, thereby improving the safety of the secondary battery 001.

[0103] Wherein, the first direction X is the length direction of the secondary battery 001, the second direction Y is the width direction of the secondary battery 001, and the third direction Z is the thickness direction of the secondary battery 001, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0104] In some embodiments, the packaging portion 220 further comprises a top edge connecting portion 223, the top sealing portion 221 is arranged along the first direction X with the top wall 211, and the side sealing portion 222 is arranged along the second direction Y with the side wall 213. The top edge connecting portion 223 is connected with the side sealing portion 222 and the top sealing portion 221, the top sealing portion 221 and the top edge connecting portion 223 form a containing space 224, the first circuit board 411 is contained in the containing space 224, and the first covering member 510 covers the top edge connecting portion 223. By bending the top sealing portion 221 to arrange the top sealing portion 221 along the first direction X with the top wall 211 and form the containing space 224 containing the first circuit board 411, the top edge connecting portion 223 and the first circuit board 411 can share the space of the secondary battery 001 in the first direction X, thereby improving the energy density of the secondary battery 001.

[0105] Referring to Figure 1 and Figure 5 In some embodiments, the first recess 511 comprises a first wall surface 5111, a second wall surface 5112, a third wall surface 5113, and a fourth wall surface 5114. The first wall surface 5111 and the second wall surface 5112 are arranged along the second direction Y, the third wall surface 5113 is at least partially perpendicular to the first direction X, and the fourth wall surface 5114 is at least partially perpendicular to the third direction Z. The first wall surface 5111, the second wall surface 5112, the third wall surface 5113, and the fourth wall surface 5114 together form the first recess 511 for clamping cooperation with the terminal device 002, thereby improving the stable installation basis of the secondary battery 001.

[0106] Among them, the first wall surface 5111, the second wall surface 5112, and the fourth wall surface 5114 are all planes, there is a circular arc transition surface 5115 between the first wall surface 5111 and the fourth wall surface 5114, there is a circular arc transition surface 5115 between the second wall surface 5112 and the fourth wall surface 5114, and the third wall surface 5113 is recessed towards the main body portion 210 to form a circular arc concave surface.

[0107] Referring to Figure 1 and Figure 6 In some embodiments, the second recess 523 comprises a fifth wall surface 5231 and a sixth wall surface 5232, the fifth wall surface 5231 is at least partially perpendicular to the first direction X, and the sixth wall surface 5232 is at least partially perpendicular to the third direction Z. The fifth wall surface 5231 and the sixth wall surface 5232 together form the second recess 523 for clamping cooperation with the terminal device 002, thereby improving the stable installation basis of the secondary battery 001.

[0108] Referring to Figure 4 , Figure 7 and Figure 8In some embodiments, the secondary battery 001 further comprises a first protective film 600, the first protective film 600 covers and bonds the main body 210 and the second cladding member 520. On the one hand, the first protective film 600 can strengthen the connection between the main body 210 and the second cladding member 520. On the other hand, the first protective film 600 can protect the surface of the main body 210 and the second cladding member 520, and improve the problem of scratching the main body 210 and the second cladding member 520.

[0109] The second groove 523 comprises an exposed part 5233, which is exposed on the second cladding member 520, so as to facilitate the detachable connection by the exposed part 5233 and the terminal device 002 in card joint. Wherein, the exposed part 5233 is located at both ends of the second cladding member 520 along the second direction Y, which is beneficial to improve the balance of the force of the secondary battery 001 in the second direction Y when the exposed part 5233 and the terminal device 002 are in card joint.

[0110] Specifically, the main body 210 further has a first large surface 214 and a second large surface 215 arranged oppositely along a third direction Z, and the first large surface 214 and the second large surface 215 are connected with the top wall 211, the bottom wall 212 and the side wall 213 respectively.

[0111] The first protective film 600 comprises a first protective part 610, a second protective part 620 and a third protective part 630, the first protective part 610 covers the first large surface 214, the third protective part 630 covers the second large surface 215, and the second protective part 620 covers the second cladding member 520, so as to wrap the second cladding member 520 by the first protective film 600, and improve the connection stability between the second cladding member 520 and the bottom wall 212.

[0112] Please refer to Figure 4 , Figure 9 and Figure 10 In some embodiments, the secondary battery 001 further comprises a second protective film 700, and the second protective film 700 covers the bottom wall 212.

[0113] The second cladding member 520 comprises an inner cladding part 521 and an outer cladding part 522, and the inner cladding part 521 clads the second protective film 700.

[0114] The secondary battery 001 further comprises a third protective film 800, the third protective film 800 covers the inner cladding part 521 and covers the first large surface 214 and the second large surface 215 at the same time, the outer cladding part 522 clads the third protective film 800, and the second groove 523 is arranged on the outer cladding part 522.

[0115] Compared with the second cladding member 520 being directly connected with the bottom wall 212, the second protective film 700 covers the bottom wall 212 first, and then the inner cladding part 521 clads the second protective film 700, thereby improving the connection strength of the inner cladding part 521 and the bottom wall 212. The third protective film 800 covers the inner cladding part 521, and the outer cladding part 522 clads the third protective film 800, further improving the connection strength of the second cladding member 520 and the bottom wall 212.

[0116] Referring to Figure 1 and Figure 11 In some embodiments, the secondary battery 001 further comprises a support frame 910 connected to the bottom wall 212 along the first direction X. The support frame 910 is provided with a through hole 911, and the second cladding member 520 clads the bottom wall 212 and the support frame 910, and part of the second cladding member 520 is located in the through hole 911. By providing the support frame 910, the connection area of the second cladding member 520 and the bottom wall 212 and the support frame 910 is increased, and the connection strength of the second cladding member 520 and the bottom wall 212 is improved.

[0117] In some embodiments, the support frame 910 and the bottom wall 212 are provided with adhesive.

[0118] In some embodiments, the support frame 910 comprises a first support part 912, a second support part 913, a third support part 914 and a fourth support part 915. The first support part 912 and the second support part 913 are oppositely arranged along the second direction Y, and the third support part 914 and the fourth support part 915 are oppositely arranged along the first direction X. The first support part 912, the second support part 913, the third support part 914 and the fourth support part 915 form an annular structure and have an opening arranged along the third direction Z. The third support part 914 is connected with the bottom wall 212, and the through hole 911 is arranged in the fourth support part 915. The second cladding member 520 clads the bottom wall 212, the first support part 912, the second support part 913, the third support part 914 and the fourth support part 915. The second cladding member 520 can enter between the third support part 914 and the fourth support part 915 from the opening of the annular structure, thereby improving the connection strength of the support frame 910 and the second cladding member 520, and further improving the connection strength of the second cladding member 520 and the bottom wall 212.

[0119] Referring to Figure 1 and Figure 12 In some embodiments, the secondary battery 001 further comprises an adhesive member 920 connected to the bottom wall 212. The second cladding member 520 clads the bottom wall 212 and the adhesive member 920. The adhesive member 920 can adhere the bottom wall 212 and the second cladding member 520, thereby improving the connection strength of the second cladding member 520 and the bottom wall 212.

[0120] In some embodiments, the adhesive 920 is provided with grooves 921 along the side of the third direction Z, and the grooves 921 are provided with a plurality of.

[0121] The plurality of grooves 921 forms a wavy sawtooth, which is beneficial to the contact area of the adhesive 920 with the second covering 520, so as to improve the connection strength of the second covering 520 with the bottom wall 212.

[0122] In some embodiments, the adhesive 920 is double-sided tape.

[0123] Referring to Figure 1 and Figure 13 In some embodiments, the secondary battery 001 further comprises a plurality of adhesive bosses 930, which are spaced apart along the second direction Y and connected to the bottom wall 212. Along the first direction X, the plurality of adhesive bosses 930 extend away from the main body 210, and the second covering 520 covers the bottom wall 212 and the plurality of adhesive bosses 930, thereby improving the connection strength of the second covering 520 with the bottom wall 212 through the adhesive bosses 930.

[0124] Referring to Figure 1 , Figure 14 and Figure 15 In some embodiments, the second covering 520 comprises an inner covering portion 521 and an outer covering portion 522, and the inner covering portion 521 covers the bottom wall 212. Along the first direction X, the inner covering portion 521 comprises an inner covering body 5212 and a clamping structure 5211, and the clamping structure 5211 is arranged on the end face of the inner covering body 5212 away from the main body 210. The outer covering portion 522 covers the clamping structure 5211, and the clamping structure 5211 has a limiting groove 5211a, and the outer covering portion 522 is partially located in the limiting groove 5211a to form an interlocking structure.

[0125] In some embodiments, the clamping structure 5211 is a dovetail, and the outer covering portion 522 covers the clamping structure 5211 to form a dovetail groove in the outer covering portion 522, and the dovetail groove and the dovetail are clamped to form an interlocking structure, so as to improve the connection strength of the second covering 520 with the bottom wall 212.

[0126] Specifically, the clamping structure 5211 comprises a connecting portion 5211b and a clamping portion 5211c, and the connecting portion 5211b connects the inner covering body 5212 and the clamping portion 5211c. Along the second direction Y, the average thickness of the connecting portion 5211b is less than the average thickness of the clamping portion 5211c, so as to form the limiting groove 5211a, and after the outer covering portion 522 covers the connecting portion 5211b and the clamping portion 5211c, the clamping portion 5211c can form a clamping limit to the outer covering portion 522, so as to improve the connection strength of the second covering 520 with the bottom wall 212.

[0127] In some embodiments, the average thickness of the connecting portion 5211b is less than the average thickness of the clamping portion 5211c along the third direction Z, so as to form the limiting groove 5211a.

[0128] In some embodiments, the inner cladding body 5212 and the clamping structure 5211 are integrally formed. For example, the inner cladding body 5212 and the clamping structure 5211 are integrally formed by injection molding.

[0129] Referring to Figure 1 , Figure 3 and Figure 4 In some embodiments, the packaging portion 220 further comprises a bottom sealing portion 225 and a bottom sealing edge connecting portion 226. The bottom sealing portion 225 is connected to the bottom wall 212 and arranged along the first direction X with the bottom wall 212. The bottom sealing edge connecting portion 226 is connected to the side sealing portion 222 and the bottom sealing portion 225. The second cladding member 520 clads the bottom wall 212, the bottom sealing portion 225 and the bottom sealing edge connecting portion 226.

[0130] By arranging the edge of the tail portion of the secondary battery 001 with the edge, the bottom sealing portion 225 is connected to the bottom wall 212 and arranged along the first direction X with the bottom wall 212. Then, the second cladding member 520 clads the bottom wall 212, the bottom sealing portion 225 and the bottom sealing edge connecting portion 226. The second cladding member 520 is partially located in the gap between the bottom sealing portion 225 and the bottom wall 212 and / or the gap between the bottom sealing edge connecting portion 226 and the bottom wall 212, thereby greatly improving the connection strength between the second cladding member 520 and the bottom wall 212, the bottom sealing portion 225 and the bottom sealing edge connecting portion 226.

[0131] Referring to Figure 4 and Figure 16 In some embodiments, the side wall 213 comprises a first side wall 2131 and a second side wall 2132, which are respectively located on both sides of the main body portion 210 along the second direction Y. The side sealing portion 222 comprises a first side sealing portion 2221 and a second side sealing portion 2222. The first side sealing portion 2221 is connected to the first side wall 2131 and arranged along the second direction Y with the first side wall 2131. The second side sealing portion 2222 is connected to the second side wall 2132 and arranged along the second direction Y with the second side wall 2132.

[0132] The cladding member 500 further comprises a third cladding member 530 connected to the first cladding member 510 and the second cladding member 520. The third cladding member 530 is beneficial to tighten the first cladding member 510 and the second cladding member 520 towards the main body portion 210, thereby improving the connection stability between the first cladding member 510, the second cladding member 520 and the main body portion 210.

[0133] The third cladding member 530 clads the first side wall 2131 and the first side sealing part 2221, thereby improving the connection stability of the third cladding member 530 and the first side wall 2131.

[0134] Referring to Figure 4 and Figure 17 In some embodiments, the third cladding member 530 clads the second side wall 2132 and the second side sealing part 2222, thereby improving the connection stability of the third cladding member 530 and the second side wall 2132.

[0135] Referring to Figure 4 and Figure 18 In some embodiments, two third cladding members 530 are provided, and the two third cladding members 530 are arranged along the second direction Y, and the two third cladding members 530 are connected to the first cladding member 510 and the second cladding member 520, which is conducive to further tensioning the first cladding member 510 and the second cladding member 520 towards the main body part 210, thereby improving the connection stability of the first cladding member 510 and the second cladding member 520 and the main body part 210.

[0136] The two third cladding members 530 and the first cladding member 510 and the second cladding member 520 form a four-sided cladding structure around the main body part 210, thereby improving the connection stability of the two third cladding members 530 and the first cladding member 510 and the second cladding member 520 and the main body part 210.

[0137] Referring to Figure 19 The embodiments of the present application also provide a terminal device 002, which comprises a device main body (not shown in the figure), a terminal back cover (not shown in the figure), and a secondary battery 001. The device main body has a battery compartment, and the secondary battery 001 is located in the battery compartment.

[0138] The terminal back cover is connected to the device main body and covers the battery compartment, and the terminal back cover is provided with a limiting structure. The first groove 511 and the second groove 523 cooperate with the limiting structure to fix the position of the secondary battery 001.

[0139] In some embodiments, the limiting structure is a limiting column, and the first groove 511 and the second groove 523 on the secondary battery 001 and the limiting column on the terminal back cover are detachably connected, thereby improving the disassembly convenience of the soft package battery.

[0140] In addition, those skilled in the art should understand that the above embodiments are only used to illustrate the present application, and are not used as a limitation to the present application. Any appropriate changes and modifications made to the above embodiments within the spirit and principles of the present application fall within the scope of the present application.

Claims

1. A secondary battery, characterized in that, include: Electrode assembly; A housing, the housing comprising a main body and an encapsulation part, wherein the electrode assembly is housed in the main body; The main body has a top wall, a bottom wall, and a side wall. The top wall and the bottom wall are located on opposite sides of the main body along a first direction, and the side wall connects the top wall and the bottom wall. The encapsulation part includes a top sealing part and a side sealing part. The top sealing part is connected to the top wall, and the side sealing part is connected to the side wall. The electrode tab includes a connecting portion and an extension portion connected together, the connecting portion being connected to the electrode assembly, and the extension portion extending out from the top seal portion; A circuit board assembly, the circuit board assembly including a first circuit board connected to the protrusion; The covering component includes a first covering component and a second covering component, wherein the first covering component covers the top wall, the top sealing portion, the protruding portion and the first circuit board, and the second covering component covers the bottom wall; The first covering has a first groove on its surface along a third direction, and the second covering has a second groove on its surface along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The secondary battery as described in claim 1, characterized in that, The encapsulation portion further includes a top sealing edge connection portion, the top sealing portion and the top wall are arranged along the first direction, the side sealing portion and the side wall are arranged along the second direction, the top sealing edge connection portion is connected to the side sealing portion and the top sealing portion, the top sealing portion and the top sealing edge connection portion form an accommodating space, the first circuit board is housed in the accommodating space, and the first covering member covers the top sealing edge connection portion.

3. The secondary battery as described in claim 1, characterized in that, The first groove includes a first wall surface, a second wall surface, a third wall surface, and a fourth wall surface. The first wall surface and the second wall surface are arranged along the second direction. The third wall surface is at least partially perpendicular to the first direction, and the fourth wall surface is at least partially perpendicular to the third direction. And / or, The second groove includes a fifth wall surface and a sixth wall surface, wherein the fifth wall surface is at least partially perpendicular to the first direction, and the sixth wall surface is at least partially perpendicular to the third direction.

4. The secondary battery as described in claim 1, characterized in that, The secondary battery also includes a first protective film, which covers and adheres to the main body and the second cover, and the second groove includes an exposed portion that is exposed in the second cover.

5. The secondary battery as described in claim 4, characterized in that, The first protective film includes a first protective part, a second protective part, and a third protective part. The main body also has a first large surface and a second large surface disposed opposite to each other along the third direction. The first large surface and the second large surface are respectively connected to the top wall, the bottom wall, and the side wall. The first protective part covers the first large surface, the third protective part covers the second large surface, and the second protective part covers the second covering. The exposed part is located at both ends of the second covering along the second direction.

6. The secondary battery as described in claim 1, characterized in that, The secondary battery further includes a second protective film and a third protective film, the second protective film covering the bottom wall; the second covering includes an inner covering and an outer covering, the inner covering covers the second protective film, the third protective film covers the inner covering; the outer covering covers the third protective film, and the second groove is disposed in the outer covering.

7. The secondary battery as described in claim 1, characterized in that, The secondary battery also includes a support frame. Along the first direction, the support frame is connected to the bottom wall. The support frame has a through hole. The second covering member covers the bottom wall and the support frame, and a portion of the second covering member is located in the through hole.

8. The secondary battery as described in claim 1, characterized in that, The secondary battery also includes an adhesive component that connects to the bottom wall, and a second covering component that covers the bottom wall and the adhesive component.

9. The secondary battery as described in claim 8, characterized in that, The adhesive component has a groove on its side along the third direction, and there are multiple grooves.

10. The secondary battery as described in claim 1, characterized in that, The secondary battery also includes a plurality of adhesive protrusions, which are spaced apart along the second direction and connected to the bottom wall. Along the first direction, the plurality of adhesive protrusions extend away from the main body. The second cover covers the bottom wall and the plurality of adhesive protrusions.

11. The secondary battery as described in claim 1, characterized in that, The second covering includes an inner covering portion and an outer covering portion. The inner covering portion covers the bottom wall. Along the first direction, the inner covering portion includes an inner covering body and a snap-fit ​​structure. The snap-fit ​​structure is disposed on the end face of the inner covering body away from the main body. The outer covering portion covers the inner covering body and the snap-fit ​​structure. The snap-fit ​​structure has a limiting groove. The outer covering portion is partially located in the limiting groove to form an interlocking structure.

12. The secondary battery as described in claim 11, characterized in that, The snap-fit ​​structure includes a connecting part and a snap-fit ​​part, wherein the connecting part connects the inner covering body and the snap-fit ​​part; Along the second direction, the average thickness of the connecting portion is less than the average thickness of the snap-fit ​​portion to form the limiting groove, and the second direction is perpendicular to the first direction; and / or Along the third direction, the average thickness of the connecting portion is less than the average thickness of the snap-fit ​​portion to form the limiting groove, and the third direction is perpendicular to the second direction.

13. The secondary battery as described in claim 1, characterized in that, The encapsulation part further includes a bottom sealing part and a bottom sealing edge connecting part. The bottom sealing part is connected to the bottom wall and arranged along the bottom wall in a first direction. The bottom sealing edge connecting part is connected to the side sealing part and the bottom sealing part. The second covering member covers the bottom wall, the bottom sealing part and the bottom sealing edge connecting part.

14. The secondary battery as described in claim 1, characterized in that, The sidewall includes a first sidewall and a second sidewall, which are respectively located on both sides of the main body along the second direction. The side sealing part includes a first side sealing part and a second side sealing part. The first side sealing part is connected to the first sidewall and arranged with the first sidewall along the second direction. The second side sealing part is connected to the second sidewall and arranged with the second sidewall along the second direction. The covering also includes a third covering part. The third covering connects the first covering and the second covering, and covers the first sidewall and the first side seal; and / or The third covering connects the first covering and the second covering, and covers the second sidewall and the second side seal.

15. A terminal device, characterized in that, The device includes a main body, a terminal back cover, and a secondary battery as described in any one of claims 1 to 14. The main body has a battery compartment, the secondary battery is located in the battery compartment, the terminal back cover is connected to the main body and covers the battery compartment, and the terminal back cover is provided with a limiting structure. The first groove and the second groove cooperate with the limiting structure to fix the position of the secondary battery.

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