Battery and electronic device

Abstract

The application discloses a battery and an electronic device. The battery comprises an electrode assembly, a shell, a first adhesive, a second adhesive, and a protection device. The electrode assembly comprises a first tab. The shell comprises a first main body and a side edge connected to the first main body, and the side edge comprises a first wall surface and a second wall surface. The first adhesive comprises a first adhesive surface and a second adhesive surface arranged opposite to each other. The protection device comprises a first part and a second part. The first part is adhered to the second adhesive surface. The second part is bent to be arranged in a laminated manner with the first part after being welded to the part of the first tab that protrudes out of the shell. A third part of the second adhesive is adhered to the surface of the first part facing the second part, and a fourth part of the second adhesive is adhered to the second adhesive surface. The adhesive mode of the second adhesive can improve the adhesive reliability of the first part, reduce the possibility of the first part being separated from the second adhesive surface, and make the connection reliability of the protection device and the shell higher.

Description

Technical Field

[0001] This application relates to the field of electrochemistry, and in particular to batteries and electronic devices. Background Technology

[0002] To prevent damage caused by abnormal temperature, charging / discharging voltage, or charging / discharging current, batteries are equipped with protection devices. These devices disconnect the battery circuit under these abnormal conditions, thus protecting the battery. However, the existing connection structure between the protection device and the battery cell is not stable enough. Summary of the Invention

[0003] The main technical problem addressed by the embodiments of this application is to provide a battery and electronic device that enables a more stable connection of the protection device.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a battery, the battery including an electrode assembly, a housing, a first adhesive member, a second adhesive member, and a protective device. The electrode assembly includes a first tab. The housing includes a first main body and a side portion connected to the first main body. The first main body accommodates the electrode assembly, and the first tab passes through the side portion and extends out of the housing. The side portion includes a first wall surface and a second wall surface distributed opposite to each other along its thickness direction. The first adhesive member includes a first adhesive surface and a second adhesive surface disposed opposite to each other, the first adhesive surface being adhered to the first wall surface. The protective device is adhered to the second adhesive surface. The protective device includes a second main body and a first connecting portion electrically connected to the second main body. The first connecting portion includes a first part and a second part. The first part is adhered to the second adhesive surface, and the second part is connected to the portion of the first tab extending out of the housing and then bent to be stacked with the first part. The second adhesive member includes a third part and a fourth part connected to each other. The third part is adhered to the surface of the first part facing the second part, and the fourth part is adhered to the second adhesive surface. In the above solution, the bonding method of the second adhesive can improve the bonding reliability of the first part, reduce the possibility of the first part detaching from the second adhesive surface, make the connection reliability between the protection device and the shell higher, and improve the battery life.

[0005] In some embodiments, the second main body portion and the first connecting portion are distributed along the length direction of the side portion, and along the length direction of the side portion, the fourth portion is bonded to the side of the first connecting portion opposite to the second main body portion. In the above solution, the length space of the side portion can be fully utilized, reducing the dimension of the side portion along the Y direction, thereby reducing the overall size of the battery.

[0006] In some embodiments, along the length direction of the side portion, the dimension H1 of the fourth portion satisfies 7 mm ≤ H1 ≤ 12 mm. In the above solution, the bonding dimensions of the first adhesive member and the second adhesive member can provide suitable adhesive force, thereby improving the bonding life of the first adhesive member and the second adhesive member. Simultaneously, it also allows the second adhesive member to have a suitable size, reducing the material used in the second adhesive member and lowering material costs.

[0007] In some embodiments, the third portion is at least partially adhered to the wall surface of the second main body that faces away from the first wall surface. In the above solution, the third portion can simultaneously cover at least a portion of the second main body to achieve the purpose of protecting the second main body.

[0008] In some embodiments, the surface of the second adhesive member facing away from the first wall is adhesive, and the wall surface of the third portion facing the second portion is adhered to the second portion. This solution improves the fixing effect of the second adhesive member on the first connection portion and effectively reduces the probability of separation between the second and third portions.

[0009] In some embodiments, the protective device further includes a second connecting portion electrically connected to the second main body portion, the second connecting portion being connected to a second adhesive surface, and the battery further includes a third connecting portion and a third adhesive member. One end of the third connecting portion is electrically connected to the second connecting portion, and the other end extends to a side portion opposite to the first main body portion. The third adhesive member includes a fifth portion and a sixth portion connected to each other, the fifth portion being bonded to the portion where the third connecting portion and the second connecting portion are connected, and the sixth portion being bonded to the second adhesive surface. In the above solution, the third adhesive member can improve the bonding effect on the second assembly portion, effectively reducing the probability of the second assembly portion detaching from the housing.

[0010] In some embodiments, the second main body and the second connecting portion are distributed along the length direction of the side portion, and along the length direction of the side portion, the sixth portion is adhered to the side of the second connecting portion opposite to the second main body. In the above solution, the length space of the side portion can be fully utilized, reducing the dimension of the side portion along the Y direction, thereby reducing the overall size of the battery.

[0011] In some embodiments, along the length direction of the side portion, the dimension H2 of the sixth portion satisfies 7 mm ≤ H2 ≤ 12 mm. In the above solution, the bonding dimensions of the first and third adhesive components can provide suitable adhesive force, thereby improving the bonding life of the first and third adhesive components. Simultaneously, it also allows the third adhesive component to have a suitable size, reducing the material usage of the third adhesive component and lowering material costs.

[0012] In some embodiments, the second adhesive component and the third adhesive component are integrally connected. This solution reduces processing steps and improves processing efficiency. Furthermore, it reduces the overall bonding difficulty of the second and third adhesive components and decreases the number of positioning steps during bonding (when the second and third adhesive components are a single unit, only one positioning step is required to complete the bonding process).

[0013] In some embodiments, the battery further includes a fourth adhesive member, which includes a seventh portion and an eighth portion connected to each other. The seventh portion is adhered to the second wall surface, and the eighth portion covers and adheres to the surface of the first tab opposite to the second adhesive surface. This design further enhances the securing effect on the protective device. The structure of the fourth adhesive member covering the protruding side portion of the first tab further protects the first tab, preventing it from being exposed and reducing the risk of a short circuit due to contact between the first tab and the casing.

[0014] In some embodiments, the eighth portion is at least partially bonded to the second bonding surface. This solution improves the bonding effect of the fourth adhesive member and reduces the risk of the fourth adhesive member detaching from the side portion.

[0015] In some embodiments, the fourth adhesive further includes a ninth portion connected to the seventh portion, the ninth portion being bonded to the surface of the sixth portion facing away from the second adhesive surface. This solution further improves the bonding effect on the third connecting portion, preventing the third connecting portion from detaching from the first adhesive due to the third adhesive detaching from the first adhesive.

[0016] In some embodiments, the ninth portion is at least partially bonded to the second bonding surface. The above solution can further improve the bonding effect of the fourth adhesive element.

[0017] In some embodiments, the battery further includes a fifth adhesive member, which includes a tenth portion and an eleventh portion connected to each other. The tenth portion covers and is bonded to the wall surface of the protective device opposite to the second adhesive member and is bonded to the second adhesive surface, while the eleventh portion is bonded to the second wall surface. This solution improves the connection reliability of the protective device and further reduces the probability of the protective device detaching from the housing.

[0018] In some embodiments, the eleventh part covers and adheres to the surface of the first electrode tab that is away from the second adhesive member. This solution further enhances the bonding effect of the fifth adhesive member.

[0019] A second aspect of this application also provides an electronic device comprising the battery of any of the above.

[0020] The battery provided in this application has a protective device attached to the side of the casing. A first portion of the first connecting part of the protective device is bonded to a second adhesive surface of a first adhesive member. The second portion is welded to the portion of the first electrode protruding from the casing and then bent to overlap with the first portion. Specifically, in this application, a second adhesive member is arranged between the first and second portions of the first connecting part. A third portion of the second adhesive member is bonded to the surface of the first portion facing away from the second adhesive member, and a fourth portion of the second adhesive member is bonded to the second adhesive surface. This design improves the bonding reliability of the first portion, reduces the possibility of the first portion detaching from the second adhesive surface, and enhances the connection reliability between the protective device and the casing, thereby extending the battery's lifespan. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0022] Figure 1 This is a side view of the battery provided in the first embodiment of this application, viewed from the opposite direction Z; wherein the second part is not bent to be stacked with the first part, and the second adhesive is not shown;

[0023] Figure 2 yes Figure 1 A partial view;

[0024] Figure 3 This is a side view of the side portion of the battery provided in the first embodiment of this application, viewed from the opposite direction along direction Z; wherein the second portion is not bent to be stacked with the first portion;

[0025] Figure 4 yes Figure 3 A cross-sectional view of the side portion of the battery in the diagram, cut along the MM direction;

[0026] Figure 5 This is a side view schematic diagram of the side portion of the battery provided in the first embodiment of this application, viewed from the opposite direction along the Z direction;

[0027] Figure 6 yes Figure 5 A cross-sectional view of the side portion of the battery in the diagram, cut along direction NN.

[0028] Figure 7 This is a side view schematic diagram of the side portion of the battery provided in the second embodiment of this application, viewed from the opposite direction along the Z direction;

[0029] Figure 8 This is a side view schematic diagram of the side portion of the battery provided in the third embodiment of this application, viewed from the opposite direction along the Z direction.

[0030] Figure 9 This is a side view schematic diagram of the side portion of the battery provided in the third embodiment of this application, viewed along the Z direction;

[0031] Figure 10 This is a side view of the side portion of the battery provided in the fourth embodiment of this application, viewed from the opposite direction along the Z direction.

[0032] Figure 11 This is a side view of the side portion of the battery provided in the fourth embodiment of this application, viewed along the Z direction. Detailed Implementation

[0033] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0035] A battery protection device protects the battery during charging and discharging. When an abnormal charging or discharging occurs, the protection device can disconnect the battery's circuitry. In related technologies, the protection device is connected to the battery cell and includes a main body and two connecting parts (hereinafter referred to as the first connecting part and the second connecting part). The main body contains a circuit for monitoring and controlling the voltage or circuitry during charging and discharging. The first connecting part of the protection device is electrically connected to one of the tabs of the battery cell, and the second connecting part is electrically connected to a connecting piece. The connecting piece replaces the aforementioned tab, thereby enabling the current within the battery cell to be discharged. When a circuit is formed within the main body of the protection device, the battery cell's electrical energy can be discharged through the connecting piece and the other tab. When an open circuit is formed within the main body of the protection device, the entire battery is open-circuited.

[0036] Regarding the fixing of the protection device, the applicant initially believes that, in order to fix the protection device to the battery cell housing, a first adhesive component can be pasted onto the side of the housing, with both sides of the first adhesive component being adhesive. The protection device is adhered to the adhesive surface of the first adhesive component facing away from the side. The first connecting part of the protection device includes a first portion and a second portion. The first portion is adhered to the first adhesive component, and the second portion extends out of the side and is welded to one of the tabs of the battery cell (the reason for the second portion extending out of the side for welding is that, after the second portion extends out of the side and is stacked with the tab, it is easier for the welding equipment to clamp the two and apply pressure during welding, thereby improving the stability during welding). After the two are welded (for ease of description, the entire assembly after the second portion and the tab are welded is referred to as the first assembly), the first assembly is bent to be stacked with the first portion. To reduce the probability of the first connecting part of the protection device detaching from the first adhesive component, a second adhesive component can be pasted onto the surface of the first assembly facing away from the first adhesive component. A portion of the second adhesive component is adhered to the first assembly, and the other portion is adhered to the first adhesive component.

[0037] The applicant further discovered that when the above-described structure is used to fix the protective device, due to the relatively thick thickness of the first connecting portion, which has a three-layer structure along the thickness direction of the side portion—a first part, a second part, and a tab—gaps easily create gaps between the second adhesive and the first adhesive at the boundary of the three-layer structure. Therefore, the second adhesive is difficult to fit tightly against the first adhesive. This problem causes the second adhesive to gradually separate from the first adhesive, starting from the aforementioned boundary, after a period of battery use. Ultimately, the second adhesive loses its fixing effect on the first connecting portion, causing the first connecting portion to detach from the first adhesive, and consequently, the protective device to detach from the first adhesive. Therefore, the above solution still fails to provide a good fixation for the protective device.

[0038] In view of this, see Figure 1-11 This application provides a battery 10, which includes an electrode assembly, a housing 100, a first adhesive 500, a second adhesive 600, and a protection device 300. This battery 10 improves the reliability of the connection to the protection device 300.

[0039] The electrode assembly includes a first tab 210, a second tab 220, and a current collector assembly. The current collector assembly includes at least two current collectors of opposite polarities. The first tab 210 is electrically connected to one of the current collectors, and the second tab 220 is electrically connected to the other current collector, thereby making the first tab 210 and the second tab 220 have opposite polarities. The battery 10 can conduct electrical energy through the first tab 210 and the second tab 220.

[0040] The housing 100 includes a first main body portion 110 and at least one side portion 120 connected to the first main body portion 110. The first main body portion 110 defines a receiving cavity in which an electrode assembly is received. The side portion 120 is located to the side of the first main body portion 110 and is used to encapsulate the housing 100, thereby ensuring the sealing of the receiving cavity of the first main body portion 110. The housing 100 may have multiple side portions 120; in this application, the structure of one side portion 120 will be described.

[0041] After the electrode assembly is disposed within the first main body 110, its first electrode tab 210 and second electrode tab 220 both pass through the side portion 120 and extend out of the housing 100. The first electrode tab 210 and the second electrode tab 220 can extend out of the housing 100 from one side portion 120, or they can each extend out of the housing 100 from two different sides 120. See also Figure 1-3 In this application, both the first tab 210 and the second tab 220 extend out of the housing 100 via a side portion 120. The side portion 120 includes portions extending along its own thickness direction (i.e., Figure 6 The first wall 121 and the second wall 122 are relatively distributed in the direction Z.

[0042] The first adhesive component 500 has double-sided adhesiveness, that is, the first adhesive component 500 includes a first adhesive surface 510 and a second adhesive surface 520 disposed opposite to each other. The first adhesive surface 510 of the first adhesive component 500 is bonded to the first wall surface 121, and the second adhesive surface 520 is used to bond the protective device 300.

[0043] The protective device 300 is bonded to the second adhesive surface 520 (meaning that at least a portion of the protective device 300 is bonded to the second adhesive surface 520). The protective device 300 includes a second main body portion 310 and a first connecting portion 320 and a second connecting portion 330 electrically connected to the second main body portion 310. See also Figure 1-2 The first connecting portion 320 includes a first part 321 and a second part 322. The first part 321 is bonded to a second bonding surface 520. The second part 322 is stacked with the portion of the first electrode tab 210 extending out of the housing 100 and then connected, specifically by welding. After the second part 322 and the portion of the first electrode tab 210 extending out of the housing 100 are welded, they are bent to be stacked with the first part 321. For ease of description, the entire assembly after the second part 322 and the portion of the first electrode tab 210 extending out of the housing 100 are welded together is referred to as the first assembled part. It should be noted that... Figure 1-2 The structure shown is such that after the second part 322 is connected to the first tab 210, the first assembly part is not bent to be stacked with the first part 321.

[0044] The second adhesive member 600 includes a third portion 610 and a fourth portion 620 connected to each other. Specifically, in this application, before the first assembly is bent to overlap with the first portion 321, the third portion 610 of the second adhesive member 600 is bonded to the surface of the first portion 321 facing the second portion 322, and the fourth portion 620 is bonded to the second adhesive surface 520 (see details for the specific structure). Figure 3-4 After the second adhesive component 600 is bonded, the first assembly is bent to fit the surface of the second adhesive component 600 away from the first adhesive component 500, so that the first adhesive component 500, the first part 321 of the first connecting part 320, the third part 610 of the second adhesive component 600, the second part 322 of the first connecting part 320, and the part where the first tab 210 connects to the second part 322 (a total of five parts) are stacked together along the Z direction (see details for the specific structure). Figure 5-6 ).

[0045] In this application, the battery 10, by having the second adhesive member 600 bonded to the surface of the first part 321 away from the first adhesive member 500 before the first assembly is bent and stacked with the first part 321, can enhance the bonding reliability between the first part 321 and the first adhesive member 500. On the other hand, since the second adhesive member 600 and the first adhesive member 500 are separated by only one component, the first part 321, and the thickness at the boundary of the first part 321 is small, the gap between the first adhesive member 500 and the second adhesive member 600 at the aforementioned boundary is smaller. The first adhesive member 500 can be tightly bonded and fixed to the second adhesive member 600, and the two are not easy to separate. This improves the connection reliability of the second adhesive member 600 to the protection device 300, reduces the probability of the protection device 300 detaching from the housing 100, and improves the service life of the battery 10.

[0046] The arrangement direction of the first connecting portion 320 and the second main body portion 310 of the protective device 300 depends on specific requirements. In one embodiment, the first connecting portion 320 and the second main body portion 310 of the protective device 300 may be arranged along direction Y (direction Y is perpendicular to the length of the side portion 120). In another embodiment, the second main body portion 310 and the first connecting portion 320 are arranged along a direction inclined to both direction Y and direction X. In one embodiment, see... Figure 1-6 The second main body 310 and the first connecting part 320 are distributed along the length direction (i.e., direction X) of the side part 120. This design can make full use of the length space of the side part 120, reduce the size of the side part 120 along the direction Y, and thus reduce the overall size of the battery 10.

[0047] The bonding position of the fourth portion 620 of the second adhesive member 600 relative to the first portion 321 depends on specific requirements. In one embodiment, the fourth portion 620 and the first connecting portion 320 are distributed along the Y direction, that is, the fourth portion 620 is bonded between the first connecting portion 320 and the first main body portion 110. In one embodiment, see... Figure 5-6 Along the length direction (i.e., direction X) of the side portion 120, the fourth portion 620 is bonded to the side of the first connecting portion 320 opposite to the second main body portion 310. In other words, the fourth portion 620 and the first connecting portion 320 are arranged along direction X. In this design, the length space of the side portion 120 can be fully utilized, reducing the size of the side portion 120 along direction X, thereby reducing the overall size of the battery 10. In one embodiment, the fourth portion 620 may also be partially distributed along direction X with the first portion 321 and partially distributed along direction Y with the first portion 321.

[0048] The applicant has discovered that the bonding dimensions between the second adhesive component 600 and the first adhesive component 500 are related to the adhesive force and bonding life between them. When the bonding dimensions between the first adhesive component 500 and the second adhesive component 600 are large, the adhesive force is higher and the bonding life is longer. Therefore, in one embodiment, see... Figure 5 Along the length direction of the side portion 120 (i.e., direction X), the dimension H1 of the fourth portion 620 satisfies 7 mm ≤ H1 ≤ 12 mm. For example, H1 can be 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, or 12 mm, etc. In this solution, the bonding dimensions of the first adhesive member 500 and the second adhesive member 600 can provide suitable adhesive force, thereby improving the bonding life of the first adhesive member 500 and the second adhesive member 600. Simultaneously, it also allows the second adhesive member 600 to have a suitable size, reducing the material used in the second adhesive member 600 and lowering material costs.

[0049] The third portion 610 of the second adhesive 600 may be adhered only to the surface of the first portion 321 facing away from the first adhesive 500. In one embodiment, see... Figure 6 The third part 610 can be at least partially adhered to the wall surface of the second main body 310 facing away from the first wall surface 121. In this solution, the third part 610 can simultaneously cover at least a portion of the second main body 310 to achieve the purpose of protecting the second main body 310. Specifically, the third part 610 can also completely cover the surface of the second main body 310 facing away from the first adhesive member 500.

[0050] The second adhesive member 600 may be adhesive on one side only, meaning the surface of the second adhesive portion 600 facing the first portion 321 is adhesive. In one embodiment, the second adhesive member 600 may be adhesive on both sides, meaning the surface of the second adhesive member 600 facing away from the first wall surface 121 is also adhesive, and the wall surface of the third portion 610 facing the second portion 322 is adhered to the second portion 322. In other words, when the first assembly is bent to be stacked with the third portion 610, the first assembly is adhered to the wall surface of the third portion 610 facing away from the first portion 321. This solution improves the fixing effect of the second adhesive member 600 on the first connecting portion 320 and effectively reduces the probability of the second portion 322 separating from the third portion 610. In particular, the second adhesive member 600 may be adhesive on both sides only at the portion of the third portion 610, or it may be adhesive on both sides entirely.

[0051] The second connecting portion 330 of the protection device 300 is connected to the second adhesive surface 520. The battery 10 also includes a third connecting portion 400, one end of which is electrically connected to the second connecting portion 330, specifically by welding. For ease of description, the portion where the third connecting portion 400 and the second connecting portion 330 are connected is referred to as the second assembly portion. When the third connecting portion 400 and the second connecting portion 330 are connected, the second connecting portion 330 can be located between the third connecting portion 400 and the first adhesive member 500, or it can be located between the first adhesive member 500 and the second connecting portion 330. In this embodiment, see... Figure 5-7 The second connecting part 330 is located between the third connecting part 400 and the first adhesive part 500.

[0052] The end of the third connecting portion 400 opposite to the second connecting portion 330 extends to the side portion 120 opposite to the first main body portion 110. Since the third connecting portion 400 is electrically connected to the protection device 300, and the protection device 300 is electrically connected to the first tab 210, the third connecting portion 400 is electrically connected to the first tab 210 and is connected in series with the first tab 210. The third connecting portion 400 can perform the function of the first tab 210, that is, the third connecting portion 400 can cooperate with the second tab 220 to conduct electrical energy from the battery 10. When an abnormality occurs during the charging and discharging process of the battery 10, the protection device 300 forms an open circuit, causing the circuit between the third connecting portion 400 and the first tab 210 to be disconnected, thereby protecting the battery 10.

[0053] See Figure 7The battery 10 also includes a third adhesive member 700 to improve the connection reliability of the second assembly and reduce the probability of the second assembly detaching from the housing 100. In one embodiment, the third adhesive member 700 includes a fifth portion 710 and a sixth portion 720 connected to each other. The fifth portion 710 is bonded to the portion where the third connecting portion 400 and the second connecting portion 330 are connected, and the sixth portion 720 is bonded to the second adhesive surface 520. In the above solution, the third adhesive member 700 can improve the bonding effect on the second assembly and effectively reduce the probability of the second assembly detaching from the housing 100.

[0054] The arrangement direction of the second connecting portion 330 and the second main body portion 310 of the protective device 300 depends on specific requirements. In one embodiment, the second connecting portion 330 and the second main body portion 310 of the protective device 300 may be arranged along direction Y (direction Y is perpendicular to the length of the side portion 120). In another embodiment, the second main body portion 310 and the second connecting portion 330 are arranged along a direction inclined to both direction Y and direction X. In one embodiment, see... Figure 6 The second main body portion 310 and the second connecting portion 330 are distributed along the length direction (i.e., direction X) of the side portion 120. This design can make full use of the length space of the side portion 120, reduce the size of the side portion 120 along the direction Y, and thus reduce the overall size of the battery 10.

[0055] The bonding position of the sixth portion 720 of the third adhesive 700 relative to the second connecting portion 330 depends on specific requirements. In one embodiment, the sixth portion 720 and the second connecting portion 330 are distributed along the Y direction, that is, the sixth portion 720 is bonded between the second connecting portion 330 and the first main body portion 110. In another embodiment, see... Figure 5-6 Along the length direction (i.e., direction X) of the side portion 120, the sixth portion 720 is adhered to the side of the second connecting portion 330 opposite to the second main body portion 310. In other words, the sixth portion 720 and the second connecting portion 330 are arranged along direction X. In this design, the length space of the side portion 120 can be fully utilized, reducing the size of the side portion 120 along direction X, thereby reducing the overall size of the battery 10. In one embodiment, the sixth portion 720 may also be partially distributed along direction X with the second connecting portion 330 and partially distributed along direction Y with the second connecting portion 330.

[0056] The applicant has discovered that the bonding dimensions between the third adhesive component 700 and the first adhesive component 500 are related to the adhesive force and bonding life between them. When the bonding dimensions between the first adhesive component 500 and the third adhesive component 700 are large, the adhesive force is higher and the bonding life is longer. Therefore, in one embodiment, see... Figure 7Along the length direction of the side portion 120 (i.e., direction X), the dimension H2 of the sixth portion 720 satisfies 7 mm ≤ H2 ≤ 12 mm. For example, H2 can be 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, or 12 mm, etc. In this solution, the bonding dimensions of the first adhesive member 500 and the third adhesive member 700 can provide suitable adhesive force, thereby improving the bonding life of the first adhesive member 500 and the third adhesive member 700. Simultaneously, it also allows the third adhesive member 700 to have a suitable size, reducing the material used in the third adhesive member 700 and lowering material costs.

[0057] The second adhesive component 600 and the third adhesive component 700 can be arranged at intervals or connected to each other. When the second adhesive component 600 and the third adhesive component 700 are connected to each other, the second adhesive component 600 can be bonded to the wall surface of the third adhesive component 700 away from the wall surface of the first adhesive component 500, or the third adhesive component 700 can be bonded to the wall surface of the second adhesive component 600 away from the wall surface of the first adhesive component 500. In one embodiment, the third adhesive component 700 and the second adhesive component 600 can also be integrally connected, that is, the third adhesive component 700 and the second adhesive component 600 are a whole. In this solution, on the one hand, processing steps can be reduced and processing efficiency can be improved; on the other hand, the bonding difficulty of the second adhesive component 600 and the third adhesive component 700 as a whole can be reduced, and the number of positioning steps during bonding can be reduced (when the second adhesive component 600 and the third adhesive component 700 are a whole, only one positioning is required to complete the bonding step).

[0058] See Figure 8-9 In some embodiments, the battery 10 further includes a fourth adhesive member 800, which includes a seventh portion 810 and an eighth portion 820 connected to each other. The seventh portion 810 is adhered to the second wall surface 122, and the eighth portion 820 covers and adheres to the surface of the first tab 210 facing away from the second adhesive surface 520. This design further enhances the securing effect on the protection device 300. The structure of the fourth adhesive member 800 covering the portion of the first tab 210 extending from the side 120 further protects the first tab 210, preventing it from being exposed and reducing the risk of a short circuit due to contact between the first tab 210 and the housing 100.

[0059] In some embodiments, the eighth portion 820 is at least partially bonded to the second bonding surface 520. This solution improves the bonding effect of the fourth adhesive member 800 and reduces the risk of the fourth adhesive member 800 detaching from the side portion 120.

[0060] In some embodiments, the fourth adhesive 800 further includes a ninth portion 830 connected to the seventh portion 810, the ninth portion 830 being bonded to the surface of the sixth portion 720 facing away from the second adhesive surface 520. In the above solution, the bonding effect on the third connecting portion 400 can be further improved, preventing the third connecting portion 400 from detaching from the first adhesive 500 due to the third adhesive 700 detaching from the first adhesive 500.

[0061] In some embodiments, the ninth portion 830 is at least partially bonded to the second bonding surface 520. The above solution can further improve the bonding effect of the fourth adhesive member 800.

[0062] See Figure 10-11 In some embodiments, the battery 10 further includes a fifth adhesive member 900, which includes a tenth portion 910 and an eleventh portion 920 connected to each other. The tenth portion 910 covers and is bonded to the wall surface of the protective device 300 opposite to the second adhesive member 600 and is bonded to the second adhesive surface 520. The eleventh portion 920 is bonded to the second wall surface 122. This solution improves the connection reliability of the protective device 300 and further reduces the probability of the protective device 300 detaching from the housing 100.

[0063] In some embodiments, the eleventh part 920 covers and adheres to the surface of the first tab 210 facing away from the second adhesive member 600. This solution further enhances the bonding effect of the fifth adhesive member 900.

[0064] The second aspect of this application also provides an electronic device comprising the battery 10 provided in this application. The electronic device in this application is not particularly limited and can be any electronic device known in the prior art. For example, the electronic device includes, but is not limited to, laptops, pen-based computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium / sodium-ion capacitors, etc.

[0065] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A battery, characterized in that, include: Electrode assembly, including a first electrode tab; The housing includes a first main body portion and a side portion connected to the first main body portion. The first main body portion accommodates the electrode assembly. The first electrode tab passes through the side portion and extends out of the housing. The side portion includes a first wall surface and a second wall surface that are distributed opposite to each other along its own thickness direction. The first adhesive component includes a first adhesive surface and a second adhesive surface disposed opposite to each other, wherein the first adhesive surface is bonded to the first wall surface; A protective device is bonded to the second adhesive surface. The protective device includes a second main body and a first connecting part electrically connected to the second main body. The first connecting part includes a first part and a second part. The first part is bonded to the second adhesive surface. The second part is connected to the portion of the first electrode that extends out of the housing and is bent to be stacked with the first part. and The second adhesive component includes a third portion and a fourth portion connected to each other. The third portion is bonded to the surface of the first portion facing the second portion, and the fourth portion is bonded to the second adhesive surface. The surface of the second adhesive component facing away from the first wall surface is adhesive, and the wall surface of the third portion facing the second portion is bonded to the second portion.

2. The battery according to claim 1, characterized in that, The second main body and the first connecting part are distributed along the length direction of the side part, and along the length direction of the side part, the fourth part is bonded to the side of the first connecting part away from the second main body.

3. The battery according to claim 2, characterized in that, Along the length of the side portion, the dimension H1 of the fourth portion satisfies 7 mm ≤ H1 ≤ 12 mm.

4. The battery according to claim 1, characterized in that, The third part is at least partially bonded to the wall surface of the second main body that is away from the first wall surface.

5. The battery according to claim 1, characterized in that, The protective device further includes a second connecting part electrically connected to the second main body, the second connecting part being connected to the second adhesive surface, and the battery further includes: The third connecting part has one end electrically connected to the second connecting part, and the other end extends to the side of the side part away from the first main body part; The third adhesive component includes a fifth part and a sixth part that are connected to each other. The fifth part is bonded to the portion where the third connecting part is connected to the second connecting part, and the sixth part is bonded to the second adhesive surface.

6. The battery according to claim 5, characterized in that, The second main body and the second connecting part are distributed along the length direction of the side part, and along the length direction of the side part, the sixth part is bonded to the side of the second connecting part away from the second main body.

7. The battery according to claim 6, characterized in that, Along the length of the side portion, the size H2 of the sixth portion satisfies 7 mm ≤ H2 ≤ 12 mm.

8. The battery according to claim 5, characterized in that, The second adhesive component is integrally connected with the third adhesive component.

9. The battery according to claim 5, characterized in that, The battery further includes a fourth adhesive component, which includes a seventh portion and an eighth portion connected to each other. The seventh portion is adhered to the second wall surface, and the eighth portion covers and is adhered to the surface of the first tab opposite to the second adhesive surface.

10. The battery according to claim 9, characterized in that, The eighth part is at least partially bonded to the second bonding surface.

11. The battery according to claim 9, characterized in that, The fourth adhesive also includes a ninth portion connected to the seventh portion, the ninth portion being bonded to the surface of the sixth portion facing away from the second adhesive surface.

12. The battery according to claim 11, characterized in that, The ninth part is at least partially bonded to the second bonding surface.

13. The battery according to claim 5, characterized in that, The battery further includes a fifth adhesive component, which includes a tenth portion and an eleventh portion connected to each other. The tenth portion covers and is bonded to the wall of the protective device away from the second adhesive component and is bonded to the second adhesive surface. The eleventh portion is bonded to the second wall surface.

14. The battery according to claim 13, characterized in that, The eleventh part covers and adheres to the surface of the first electrode tab that is away from the second adhesive.

15. An electronic device, characterized in that, Includes the battery as described in any one of claims 1-14.

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