Secondary battery and electric device

Abstract

The embodiment of the utility model discloses a secondary battery and electric equipment, and belongs to the technical field of batteries, in the secondary battery, a temperature safety device is arranged on a protection plate, so that the mutual interference between the protection plate and the temperature safety device can be effectively avoided, a clearance area does not need to be arranged for the protection plate and the temperature safety device, and the cost is reduced. The space occupation of the clearance area is reduced; moreover, the protection plate is arranged to have orthographic projection on the edge sealing part along the thickness direction of the secondary battery, that is, in the thickness direction, at least parts of respective assembly spaces of the protection plate and the edge sealing part are mutually overlapped, so that the space occupation of the protection plate on one side of the edge sealing part can be reduced, more space is released for the battery core, and the battery quality is improved. The capacity and the space utilization rate of the secondary battery can be improved, and meanwhile, the requirements of cruising ability and space occupation are considered.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a secondary battery and an electric device. BACKGROUND

[0002] At present, the development trend of electric devices pays more attention to performance and user experience, and requires the battery to have higher endurance and occupy smaller installation space. Therefore, it is necessary to optimize the structure of the battery to realize the dual consideration of endurance and space occupation. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at overcoming the technical problem that the current battery structure cannot well consider the endurance and space occupation of the battery. Another object of the embodiment of the application is to provide an electric device.

[0004] TECHNICAL SCHEME: The secondary battery provided by the embodiment of the application comprises:

[0005] A cell comprises a body, a packaging layer and a tab. The body is arranged in the packaging layer. The packaging layer comprises an edge portion on one side of the body. The tab is connected to the body and penetrates through the edge portion to the outside of the packaging layer.

[0006] A protection plate is connected to the tab. A temperature fuse device is arranged on the protection plate. The temperature fuse device is electrically connected to the tab. The protection plate has a projection on the edge portion along the thickness direction of the secondary battery.

[0007] In some embodiments, the protection plate comprises:

[0008] A main body. The temperature fuse device is arranged on the main body. The main body has a projection on the edge portion along the thickness direction of the secondary battery.

[0009] A connecting piece is arranged on one side of the main body close to the tab and is connected to the main body and the tab respectively.

[0010] In some embodiments, the secondary battery further has a width direction intersecting with the thickness direction. The edge portion is located on one side of the body in the width direction. The tab comprises:

[0011] A first extension portion connected to the body. The first extension portion extends along the width direction and penetrates to the outside of the packaging layer.

[0012] A first bending portion connected to one end of the first extension portion away from the body and extending towards one side close to the main body.

[0013] A second extending part is arranged between the first extending part and the main body part and connected with the connecting part and the first bending part respectively.

[0014] In some embodiments, the connecting part comprises:

[0015] A first connecting part is connected with the main body part.

[0016] A second connecting part is connected with the first connecting part away from the main body part, and the second extending part is arranged between the first connecting part and the second connecting part.

[0017] In some embodiments, the connecting part comprises:

[0018] A third connecting part is connected with the main body part.

[0019] A second bending part is connected with the third connecting part and bent towards the side close to the tab.

[0020] A fourth connecting part is arranged between the third connecting part and the tab and connected with the second bending part and the tab respectively.

[0021] In some embodiments, the main body part comprises:

[0022] A first plate body is arranged on one side of the sealing edge part in the thickness direction, and the connecting part is arranged on the side close to the tab of the first plate body and connected with the first plate body and the tab respectively.

[0023] A second plate body is arranged on the side away from the first plate body of the sealing edge part.

[0024] A connecting part is connected with the first plate body and the second plate body respectively.

[0025] The temperature fuse device is arranged on the first plate body or the second plate body.

[0026] In some embodiments, the secondary battery further has a length direction intersecting with the thickness direction.

[0027] The secondary battery comprises a plurality of the battery cells arranged in the length direction, and the protection plate is connected with the tab of each battery cell, and the protection plate has the orthographic projection on the sealing edge part of each battery cell along the thickness direction of the secondary battery.

[0028] In some embodiments, a plurality of the temperature fuse devices are arranged on the protection plate, and each temperature fuse device is electrically connected with the tab of one battery cell.

[0029] In some embodiments, the secondary battery further has a width direction intersecting the thickness direction, and the edge sealing portion is located on one side of the body in the width direction;

[0030] The normal projection of the protection plate in the width direction has a first size L, which satisfies: 2mm≤L≤5mm.

[0031] In some embodiments, the battery cell includes two of the tabs with different polarities, and the temperature fuse device is arranged between the two tabs and electrically connected to the two tabs respectively.

[0032] In some embodiments, the secondary battery further includes:

[0033] A cladding layer cladding at least part of the protection plate and at least part of the edge sealing portion.

[0034] Correspondingly, the power consumption device according to the embodiments of the present application includes the secondary battery according to any one of the above embodiments.

[0035] Advantages: The secondary battery according to the embodiments of the present application includes: a battery cell including a body, a packaging layer, and a tab, the body being arranged in the packaging layer, the packaging layer including an edge sealing portion on one side of the body, the tab being connected to the body and penetrating from the edge sealing portion to the outside of the packaging layer; a protection plate connected to the tab, the protection plate being provided with a temperature fuse device, the temperature fuse device being electrically connected to the tab, and the protection plate having a normal projection on the edge sealing portion along the thickness direction of the secondary battery. In the secondary battery according to the present application, the temperature fuse device is arranged on the protection plate, which can effectively avoid the interference between the protection plate and the temperature fuse device, and there is no need to set a void area for the protection plate and the temperature fuse device, thereby reducing the space occupation of the void area; and the protection plate is arranged to have a normal projection on the edge sealing portion along the thickness direction of the secondary battery, i.e., in the thickness direction, the assembly spaces of the protection plate and the edge sealing portion are at least partially overlapped with each other, which can reduce the space occupation of the protection plate on one side of the edge sealing portion, release more space for the battery cell, and be beneficial to improving the capacity and space utilization of the secondary battery, while meeting the requirements of the endurance and space occupation.

[0036] The power consumption device according to the embodiments of the present application can include all the technical features and advantages of the above-mentioned secondary battery, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0038] Figure 1 A structural schematic diagram of a battery provided for some embodiments of the present application;

[0039] Figure 2 An exploded structural schematic diagram of parts of a battery provided for some embodiments of the present application;

[0040] Figure 3 A structural schematic diagram of a battery provided for some embodiments of the present application; Figure 2 A partial enlarged structural schematic diagram of region A;

[0041] Figure 4 An exploded structural schematic diagram of parts of a battery provided for some embodiments of the present application;

[0042] Figure 5 A structural schematic diagram of a battery provided for some embodiments of the present application; Figure 4 A partial enlarged structural schematic diagram of region B;

[0043] Figure 6 A structural schematic diagram of a battery provided for some embodiments of the present application;

[0044] Figure 7 A structural schematic diagram of a battery provided for some embodiments of the present application; Figure 6 A top perspective structural schematic diagram of a battery;

[0045] Figure 8 A structural schematic diagram of a battery provided for some embodiments of the present application; Figure 7 A sectional structural schematic diagram along line A-A;

[0046] Figure 9 A structural schematic diagram of a battery provided for some embodiments of the present application; Figure 8 A partial enlarged structural schematic diagram of region C;

[0047] Figure 10 A structural schematic diagram of a battery provided for some embodiments of the present application; Figure 7 A structural schematic diagram of a battery provided for some embodiments of the present application;

[0048] Figure 11 A structural schematic diagram of a battery provided for some embodiments of the present application; Figure 10 A partial enlarged structural schematic diagram of region D;

[0049] Figure 12 A sectional structural partial enlarged schematic diagram of a battery provided for some embodiments of the present application;

[0050] Figure 13 A sectional structural partial enlarged schematic diagram of a battery provided for some embodiments of the present application;

[0051] Figure 14 A sectional structural partial enlarged schematic diagram of a battery provided for some embodiments of the present application;

[0052] 10 - secondary battery; 100 - battery cell; 110 - body; 120 - encapsulation layer; 121 - edge sealing portion; 130 - tab; 131 - first extension portion; 132 - first bent portion; 133 - second extension portion; 200 - protection plate; 210 - main body piece; 211 - first plate body; 212 - second plate body; 213 - coupling portion; 220 - connecting piece; 221 - first connecting portion; 222 - second connecting portion; 223 - third connecting portion; 224 - second bent portion; 225 - fourth connecting portion; 300 - temperature fuse device; 400 - jelly case; 500 - Mylar film; 600 - cladding layer. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The meaning of "a plurality of" is two or more, at least one of which can be one, two or more, unless otherwise explicitly specified. The terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0055] In the description of the present application, the thickness direction, the length direction and the width direction are introduced to more clearly describe the shape and / or structure of each component in the secondary battery, and the connection relationship and / or relative position relationship between components. In the drawings, the arrow marked Z indicates the thickness direction Z, the arrow marked Y indicates the width direction Y, and the arrow marked X indicates the length direction X. It can be understood that the thickness direction Z, the width direction Y and the length direction X can also be in the opposite direction of the corresponding arrow. It should be noted that the introduction of the thickness direction Z, the width direction Y and the length direction X does not indicate or imply the size relationship of the secondary battery in the corresponding direction.

[0056] A secondary battery is a rechargeable battery, also known as a rechargeable battery or a storage battery. Unlike a primary battery, a secondary battery can be charged by a reverse current to restore stored electrical energy. This type of battery is widely used in many applications, such as portable electronic devices including notebook computers, mobile phones, tablet computers and other various types of electrical devices. With the development of notebook computer technology, more and more high-performance, gaming laptops and other computers have appeared on the market, providing people with very good entertainment and office experience. High-performance notebook computers have high power and high energy consumption. Since notebook computers are portable, it is necessary to improve the endurance. This puts higher requirements on the capacity of notebook battery. It is necessary to optimize the internal structure space and improve the utilization rate of the battery internal cell space under the premise of constant overall battery size.

[0057] Therefore, the embodiments of the present application provide a secondary battery 10 which can meet the requirements of endurance and space occupation.

[0058] Please refer to Figures 1 to 5 The secondary battery 10 provided by the embodiments of the present application includes a cell 100 and a protection plate 200. The cell 100 is a single charging and discharging unit for storing and releasing electrical energy in the secondary battery 10. One cell 100 or multiple cells 100 can be provided in the secondary battery 10. The cell 100 includes a body 110, an encapsulation layer 120 and a tab 130. The body 110 is arranged in the encapsulation layer 120. The body 110 can be an energy storage structure formed by winding or stacking positive plates, negative plates and diaphragm layers. The encapsulation layer 120 is used to cover the outside of the body 110 to encapsulate the body 110. The encapsulation layer 120 includes an edge portion 121 on one side of the body 110. The tab 130 is connected to the body 110 and penetrates from the edge portion 121 to the outside of the encapsulation layer 120 to conduct the internal and external circuits of the cell 100. Each cell 100 can include two tabs 130 with different polarities, one of which is positive and the other of which is negative.

[0059] The protection plate 200 is connected with the tab 130, and the protection plate 200 can be a PCM (Protection Circuit Module) plate. The protection plate 200 is provided with a temperature fuse device 300, and the temperature fuse device 300 is electrically connected with the tab 130. The temperature fuse device 300 can be a temperature fuse (TCO), which is a passive thermal protection element. In the case of circuit overload or abnormal current, the temperature fuse device 300 will automatically disconnect the circuit to protect the circuit or electronic device from overheating and damage. The temperature fuse device 300 has unique temperature sensitivity and self-recovery characteristics. The surface mount technology (SMT) can be used to mount the temperature fuse device 300 on the protection plate 200.

[0060] It should be noted that some solutions for installing the temperature fuse on the battery cell packaging structure need to design a clearance area for the protection plate 200 and the temperature fuse device 300 to avoid mutual influence when welding respectively. However, the clearance area will occupy a large space of the battery and reduce the space utilization rate inside the battery. In contrast, the secondary battery 10 of the embodiment of the present application sets the temperature fuse device 300 on the protection plate 200, and realizes electrical connection with the tab 130 through the wiring on the protection plate 200. Therefore, it is not necessary to design a clearance area for the protection plate 200 and the temperature fuse device 300, which can reduce the space occupation.

[0061] Please refer to Figure 6 , Figure 7 , the protection plate 200 has a positive projection on the sealing edge part 121 along the thickness direction Z of the secondary battery 10. Specifically, in the projection manner, the light ray projected along the thickness direction Z of the secondary battery 10 irradiates the protection plate 200, and at least a part of the projection of the protection plate 200 can fall on the sealing edge part 121. That is to say, in the thickness direction Z, the protection plate 200 and the sealing edge part 121 are opposite, and the protection plate 200 can block at least a part of the sealing edge part 121 when viewed along the thickness direction Z. Therefore, compared with the solution that the protection plate 200 is completely located on the side of the sealing edge part 121 away from the body 110, the secondary battery 10 of the embodiment of the present application reduces the space occupation of the protection plate 200 on this side, releases more space for the battery cell 100, and is beneficial to improve the capacity and space utilization rate of the secondary battery 10, while meeting the requirements of the endurance and space occupation.

[0062] Please refer to Figure 6 and Figure 7In some embodiments, the secondary battery 10 includes a plurality of battery cells 100, i.e., a plurality of battery cells 100 are arranged in the secondary battery 10. The plurality of battery cells 100 are arranged in the length direction X, the protection plate 200 is connected with the tab 130 of each battery cell 100, and the protection plate 200 has a positive projection on the edge sealing portion 121 of each battery cell 100 along the thickness direction Z. That is, the plurality of battery cells 100 share the protection plate 200, and there is no need to arrange a protection plate 200 for each battery cell 100, thereby reducing the number of protection plates 200, reducing the space occupied by the protection plates 200, leaving more space for the plurality of battery cells 100, and improving the capacity of the secondary battery 10.

[0063] Optionally, a plurality of temperature fuse devices 300 are arranged on the protection plate 200, and each temperature fuse device 300 is electrically connected with the tab 130 of one battery cell 100. That is, each temperature fuse device 300 corresponds to one battery cell 100, and is used to disconnect the circuit when the battery cell 100 has a circuit overload or abnormal current, so that the secondary battery 10 can maintain safe operation.

[0064] Please refer to Figure 7 In some embodiments, the edge sealing portion 121 of the secondary battery 10 is located on one side of the body 110 in the width direction Y, and the positive projection of the protection plate 200 has a first size L in the width direction Y, which satisfies: 2mm≤L≤5mm. That is, L can be any size in 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm or a range value between any two size values. The capacity of the battery cell 100 can be improved by releasing enough space for the battery cell 100.

[0065] For example, in one embodiment, in the width direction Y, the size of the battery cell 100 is 88 mm, the size after removing the edge portion 121 is 85.5 mm, the size of the protection plate 200 is 8.5 mm, the distance between the protection plate 200 and the body 110 of the battery cell 100 is 0.3 mm, the wall thickness of the jelly case 400 of the secondary battery 10 is 1.5 mm, and the total size is 97.5 mm. If the temperature fuse device 300 is arranged separately from the protection plate 200, and the temperature fuse device 300 is arranged on the edge portion 121, an empty area needs to be arranged between the protection plate 200 and the temperature fuse device 300 to prevent mutual influence of welding, the gap between the protection plate 200 and the temperature fuse device 300 is 2.5 mm, and the size of the secondary battery formed is 102.2 mm. Therefore, the size space of 102.2-97.5=4.7 mm can be reduced in the width direction Y by using the scheme of the present application, the space is released to the battery cell 100, and the size of the battery cell 100 in the width direction Y can be increased to 92.7 mm. If the size of the battery cell 100 in the thickness direction Z is 4.8 mm and the size of the battery cell 100 in the length direction X is 60 mm, the capacity can be increased by about 6%.

[0066] Please refer to Figure 7 In some embodiments, the battery cell 100 includes two tabs 130 with different polarities, i.e., a positive tab 130 and a negative tab 130. The temperature fuse device 300 is arranged between the two tabs 130 and electrically connected to the two tabs 130, respectively. This arrangement facilitates the arrangement of the connecting lines between the temperature fuse device 300 and the two tabs 130, reduces the space occupation of the protection plate 200, and is beneficial to further reducing the size of the protection plate 200.

[0067] Please refer to Figure 4 , Figure 5 , Figure 8 and Figure 9 In some embodiments, the protection plate 200 includes a main body 210 and a connecting piece 220. The main body 210 is the main part of the protection plate 200, on which the protection circuit and the electronic components required by the protection circuit can be arranged. The temperature fuse device 300 is arranged on the main body 210 and electrically connected to the tabs 130 through the lines on the main body 210. The main body 210 has a positive projection on the edge portion 121 along the thickness direction Z, which reduces the space occupation of the main body 210 and releases more space for the battery cell 100. The connecting piece 220 is arranged on the side of the main body 210 close to the tabs 130 and connected to the main body 210 and the tabs 130, respectively. The connecting piece 220 electrically connects the tabs 130 to the protection circuit on the protection plate 200.

[0068] Please refer to Figure 9 and Figure 11In some embodiments, the edge sealing portion 121 of the secondary battery 10 is located on one side of the body 110 in the width direction Y, the tab 130 includes a first extension portion 131, a first bending portion 132, and a second extension portion 133, the first extension portion 131 is connected to the body 110, the first extension portion 131 extends in the width direction Y and penetrates to the outside of the packaging layer 120, the first bending portion 132 is connected to one end of the first extension portion 131 away from the body 110 and extends in a bent manner towards the side close to the main body 210, and the second extension portion 133 is arranged between the first extension portion 131 and the main body 210 and connected to the connecting piece 220 and the first bending portion 132, respectively. In the secondary battery 10 of the present embodiment, the connecting piece 220 of the protection plate 200 can be connected to the tab 130, and then the protection plate 200 is folded back so that it is at least partially located on one side of the edge sealing portion 121 in the thickness direction Z, thereby reducing the space occupation of the protection plate 200 in the width direction Y. Since the tab 130 is flexible, after the protection plate 200 is folded back, the tab 130 is bent, thereby forming the first extension portion 131, the first bending portion 132, and the second extension portion 133. Such an arrangement can facilitate the processing and manufacturing of the secondary battery 10, reduce the processing difficulty, and improve the processing efficiency.

[0069] Please refer to Figure 9 and Figure 10 Optionally, the connecting piece 220 includes a first connecting portion 221 and a second connecting portion 222, the first connecting portion 221 is connected to the main body 210, and the second connecting portion 222 is connected to one side of the first connecting portion 221 away from the main body 210, and the second extension portion 133 is clamped between the first connecting portion 221 and the second connecting portion 222. The first connecting portion 221 and the second connecting portion 222 clamp the tab 130, making the connection more stable and improving the stability of the secondary battery 10.

[0070] Please refer to Figure 4 and Figure 5 In some embodiments, the temperature protection device 300 is arranged on the side of the protection plate 200 facing the edge sealing portion 121. On the one hand, the temperature protection device 300 and the connecting piece 220 can be arranged on the same side of the main body 210, which facilitates the assembly of the temperature protection device 300 and the connecting piece 220 on the main body 210 of the protection plate 200 and reduces the processing and manufacturing difficulty of the protection plate 200. On the other hand, the main body 210 and the edge sealing portion 121 can shield and protect the temperature protection device 300 from being damaged by collision, thereby improving the stability of the secondary battery 10.

[0071] Please refer to Figure 12In some embodiments, the connecting member 220 includes a third connecting portion 223, a second bending portion 224, and a fourth connecting portion 225. The third connecting portion 223 is connected to the main body member 210. The second bending portion 224 is connected to the third connecting portion 223 and extends towards the side close to the tab 130. The fourth connecting portion 225 is disposed between the third connecting portion 223 and the tab 130 and is connected to the second bending portion 224 and the tab 130, respectively. In the secondary battery 10 of the present embodiment, the tab 130 can be connected to the connecting member 220 of the protection plate 200, and then the protection plate 200 is folded back so that it is at least partially located on one side of the sealing edge portion 121 in the thickness direction Z, thereby reducing the space occupation of the protection plate 200 in the width direction Y. The connecting member 220 can be a flexible connecting member, such as an FPC (flexible printed circuit board). After the protection plate 200 is folded back, the connecting member 220 is bent, thereby forming the third connecting portion 223, the second bending portion 224, and the fourth connecting portion 225. Such an arrangement can facilitate the processing and manufacturing of the secondary battery 10, reduce the processing difficulty, and improve the processing efficiency.

[0072] Referring to Figure 13 In some embodiments, the main body member 210 includes a first plate body 211, a second plate body 212, and a connecting portion 213. The first plate body 211 is disposed on one side of the sealing edge portion 121 in the thickness direction Z. The connecting member 220 is disposed on the side of the first plate body 211 close to the tab 130 and is connected to the first plate body 211 and the tab 130, respectively. The second plate body 212 is disposed on the side of the sealing edge portion 121 away from the first plate body 211. The connecting portion 213 connects the first plate body 211 and the second plate body 212, respectively. In the present embodiment, the main body portion (i.e., the main body member 210) of the protection plate 200 can be provided as two circuit boards, i.e., the first plate body 211 and the second plate body 212. The first plate body 211 and the second plate body 212 are disposed on the two sides of the sealing edge portion 121 and are connected by the connecting portion 213, which can be an FPC. Circuit structures are arranged on the first plate body 211 and the second plate body 212, respectively. The thermal cut-off device 300 is disposed on the first plate body 211 or the second plate body 212. By providing the main body member 210 as a plurality of portions including the first plate body 211, the second plate body 212, and the connecting portion 213, the space on the side of the sealing edge portion 121 of the battery cell 100 can be fully utilized, thereby improving the space utilization of the secondary battery 10 and facilitating the further improvement of the volumetric energy density and the increase of the battery capacity.

[0073] Referring to Figure 14In some embodiments, the secondary battery 10 further comprises a cladding layer 600 cladding at least part of the protection plate 200 and at least part of the edge sealing portion 121. The cladding layer 600 can be a plastic layer, and the protection plate 200 and the edge sealing portion 121 can be packaged by low-pressure injection molding, so as to improve the protection performance of the structure and the service life of the secondary battery 10.

[0074] Correspondingly, the application provides a kind of electric equipment, which can be mobile phone, notebook computer, mobile power bank and various types of equipment, it can be understood that the electric equipment can include all technical features and beneficial effects of the above-mentioned secondary battery 10, which will not be described here.

[0075] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0076] The battery pack and electric equipment provided by the embodiments of the application are described in detail above, and the principles and implementation modes of the application are described by applying specific examples. The above embodiment is only used to help understand the technical solutions and core ideas of the application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A secondary battery characterized by comprising: The secondary battery includes: an electrode core including a body, a packaging layer, and a tab, the body being disposed in the packaging layer, the packaging layer including a sealing portion on one side of the body, the tab being connected to the body and penetrating the sealing portion to the outside of the packaging layer; a protection plate connected to the tab, the protection plate having a temperature fuse device disposed thereon, the temperature fuse device being electrically connected to the tab, the protection plate having a projection on the sealing portion in a thickness direction of the secondary battery.

2. The secondary battery according to claim 1, characterized by The protection plate includes: a main body, the temperature fuse device being disposed on the main body, the main body having a projection on the sealing portion in the thickness direction; a connecting body disposed on one side of the main body close to the tab and connected to the main body and the tab.

3. The secondary battery according to claim 2, characterized by The secondary battery also has a width direction intersecting the thickness direction, the sealing portion being on one side of the body in the width direction, the tab including: a first extension connected to the body, the first extension extending in the width direction and penetrating to the outside of the packaging layer; a first bending portion connected to one end of the first extension away from the body and extending in a direction close to the main body; a second extension disposed between the first extension and the main body and connected to the connecting body and the first bending portion.

4. The secondary battery according to claim 3, characterized by The connecting body includes: a first connecting portion connected to the main body; a second connecting portion connected to one side of the first connecting portion away from the main body, the second extension being disposed between the first connecting portion and the second connecting portion.

5. The secondary battery according to claim 2, characterized by The connecting body includes: a third connecting portion connected to the main body; a second bending portion connected to the third connecting portion and extending in a direction close to the tab; a fourth connecting portion disposed between the third connecting portion and the tab and connected to the second bending portion and the tab.

6. The secondary battery according to claim 2, characterized by The main body includes: a first plate disposed on one side of the sealing portion in the thickness direction, the connecting body being disposed on one side of the first plate close to the tab and connected to the first plate and the tab; a second plate disposed on one side of the sealing portion away from the first plate; a connecting portion connecting the first plate and the second plate; The temperature fuse device is disposed on the first plate or the second plate.

7. The secondary battery according to claim 1, characterized by The secondary battery also has a length direction intersecting the thickness direction; The secondary battery includes a plurality of electrode cores arranged in the length direction, the protection plate being connected to the tab of each electrode core, and the protection plate having a projection on the sealing portion of each electrode core in the thickness direction.

8. The secondary battery according to claim 7, characterized by The protection plate has a plurality of temperature fuse devices disposed thereon, each temperature fuse device being electrically connected to the tab of one electrode core.

9. The secondary battery according to claim 1, characterized by The secondary battery also has a width direction intersecting the thickness direction, the sealing portion being on one side of the body in the width direction; The orthographic projection of the protection plate has a first size L in the width direction, satisfying 2mm≤L≤5mm.

10. The secondary battery according to claim 1, characterized by The temperature fuse device is arranged between the two tabs with different polarities and is electrically connected with the two tabs respectively.

11. The secondary battery according to any one of claims 1 to 10, characterized by The secondary battery further comprises: A cladding layer cladding at least part of the protection plate and at least part of the edge sealing portion.

12. An electrical device, characterized by The secondary battery comprises the secondary battery according to any one of claims 1 to 11.

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