Battery cell, battery, and electric device

Abstract

The application relates to a battery monomer, a battery and a power utilization device. The battery monomer comprises: an electrode leading-out part for leading out the electric energy of the battery monomer; an electrode assembly comprising a main body part and a tab, the tab comprising a connecting part and a bending part, the connecting part being used for electrically connecting with the electrode leading-out part, and the bending part being connected between the main body part and the connecting part; and a first protection part and a second protection part, the first protection part having a first bonding part and a first non-bonding part, the second protection part having a second bonding part and a second non-bonding part, the first bonding part being at least partially bonded to the connecting part, the second bonding part being at least partially bonded to the main body part, and the first non-bonding part and the second non-bonding part both covering part of the bending part and at least partially overlapping each other. The battery monomer, the battery and the power utilization device provided by the application can reduce tab cracking and separator tearing.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell, a battery, and an electrical device. Background Technology

[0002] In recent years, the new energy industry has received increasing attention, and batteries, as an important component of this industry, occupy a large market share. Batteries are formed by connecting multiple individual cells in series, parallel, or a hybrid configuration. A hybrid configuration refers to multiple individual cells connected in both series and parallel connections.

[0003] Currently, during the battery cell manufacturing process, after the tabs and electrode leads in the battery cell are welded, an insulating tape is applied to the weld mark to prevent weld slag from falling off later. Furthermore, to protect the tabs and prevent short circuits caused by inverted tab insertion, the insulating tape extends to the main body of the electrode assembly in the battery cell. However, this method of applying the tape may cause abnormal adhesion between the insulating tape and the tab, leading to the tape pulling on the tabs during subsequent core assembly and causing the tabs to crack.

[0004] To address the aforementioned issues, one existing solution is to design the adhesive portions of the insulating tape to be spaced out, omitting the adhesive portion at the point where the middle section contacts the electrode tab. This solution can resolve the problem of the electrode tab cracking due to stretching, but it introduces another problem: when the insulating tape is taut and the core is closed, the adhesive portions at both ends of the insulating tape will pull against each other, potentially causing damage to the outer diaphragm of the main body. Utility Model Content

[0005] Therefore, it is necessary to provide a battery cell, battery, and power device that can reduce the risk of tab cracking and diaphragm tearing in response to the above problems.

[0006] In a first aspect, this application provides a battery cell, the battery cell comprising:

[0007] Electrode leads are used to extract electrical energy from the battery cells;

[0008] An electrode assembly includes a main body and an electrode tab. The electrode tab includes a connecting portion and a bending portion. The connecting portion is used for electrical connection with the electrode lead-out portion, and the bending portion connects the main body and the connecting portion.

[0009] A first protective member and a second protective member, the first protective member having a first adhesive portion and a first non-adhesive portion, the second protective member having a second adhesive portion and a second non-adhesive portion, the first adhesive portion being at least partially bonded to the connecting portion, the second adhesive portion being at least partially bonded to the main body portion, and both the first non-adhesive portion and the second non-adhesive portion covering a portion of the bending portion and at least partially overlapping each other.

[0010] In some embodiments, the electrode lead-out portion includes an adapter piece, the connection portion includes a welding area, the welding area is welded to the adapter piece, and the first adhesive portion covers and adhesives the welding area.

[0011] In some embodiments, the first adhesive portion is bonded to the adapter piece.

[0012] In some embodiments, the first adhesive portion extends to the bend, and the first adhesive portion covers and adhesively bonds a portion of the bend.

[0013] In some embodiments, the length of the first adhesive portion bonded to the bent portion is a, where 0 mm < a ≤ 10 mm.

[0014] In some embodiments, the main body has a first surface on which the tab is disposed, and a second surface located in the thickness direction of the electrode assembly, the first surface being disposed adjacent to the second surface; the second adhesive portion is at least partially bonded to the second surface.

[0015] In some embodiments, the second adhesive portion extends to the bend and covers and adhesively bonds a portion of the bend.

[0016] In some embodiments, the length of the second adhesive portion bonded to the electrode tab is b, where b ≤ T / 2, T is the length of the electrode tab, and / or b ≥ 10 mm.

[0017] In some embodiments, the distance from the edge of the second adhesive portion on the second surface away from the first surface to the first surface is m, where 3mm≤m≤d / 3, and d is the width of the main body portion.

[0018] In some embodiments, the length of the overlapping portion of the first non-adhesive portion and the second non-adhesive portion is e, T / 5≤e≤T / 2, where T is the length of the tab, and / or e≥3mm.

[0019] In some embodiments, the first adhesive portion and the second non-adhesive portion are spaced apart, and / or the first non-adhesive portion and the second adhesive portion are spaced apart.

[0020] In some embodiments, the overlapping portions of the first non-adhesive portion and the second non-adhesive portion are defined as a first portion and a second portion, respectively, and in the thickness direction of the tab, the first portion is disposed away from the bending portion relative to the second portion.

[0021] In some embodiments, the first protective member includes a first substrate layer and a first adhesive layer. The first adhesive layer is disposed on the side surface of the first substrate layer facing the tab, and the portion of the first substrate layer with the first adhesive layer forms the first adhesive portion with the first adhesive layer. The remaining portion of the first substrate layer without the first adhesive layer forms the first non-adhesive portion.

[0022] The second protective member includes a second substrate layer and a second adhesive layer. The second adhesive layer is disposed on the side surface of the second substrate layer facing the main body portion, and the portion of the second substrate layer with the second adhesive layer forms the second adhesive portion together with the second adhesive layer. The remaining portion of the second substrate layer without the second adhesive layer forms the second non-adhesive portion.

[0023] In some embodiments, the thickness of the first substrate layer is h1, where 10μm≤h1≤100μm;

[0024] And / or, the thickness of the second substrate layer is h2, 10μm≤h2≤100μm;

[0025] And / or, the thickness of the first adhesive layer is h3, 10μm≤h3≤100μm;

[0026] And / or, the thickness of the second adhesive layer is h4, 10μm≤h4≤100μm;

[0027] And / or, the first substrate layer is provided with a groove and / or a through hole at the junction of the connecting portion and the bending portion;

[0028] And / or, the main body has a first surface on which the tab is disposed, and a second surface located in the thickness direction of the electrode assembly, wherein the second substrate layer has a groove and / or a through hole at the junction of the first surface and the second surface.

[0029] In some embodiments, the battery cell includes an adjacent first electrode assembly and a second electrode assembly, wherein two first protective members that are connected to two tabs of the same polarity in the first electrode assembly and the second electrode assembly are integrally formed.

[0030] Secondly, this application provides a battery comprising a battery cell as described in any of the above embodiments.

[0031] Thirdly, this application provides an electrical device that includes a battery as described in the above embodiments.

[0032] Compared with the prior art, this application has the following beneficial effects:

[0033] In the aforementioned battery cell, battery, and electrical device, the first adhesive portion is at least partially bonded to the connecting portion, and the second adhesive portion is at least partially bonded to the main body portion. Both the first and second non-adhesive portions cover the partial bending portion and are at least partially overlapped. In this way, the first and second protective components work together to cover the tab, thereby protecting it. However, since the first and second non-adhesive portions overlap between the tab and the main body portion, and there is no adhesive between them and they are not connected, the first and second non-adhesive portions will not pull on each other during core assembly. This reduces the possibility of the first and second protective components pulling on the tab and separator, lowers the risk of tab cracking and separator damage, and improves the working performance of the battery cell. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of a single battery cell in one embodiment of this application;

[0035] Figure 2 for Figure 1 The exploded view of the battery cell after the second protective component has been removed;

[0036] Figure 3 for Figure 1 The exploded view of the battery cell after the first protective component has been removed;

[0037] Figure 4 A cross-sectional view of two electrode assemblies with the first type of electrode tab stacked along the thickness direction of the electrode assembly and after being fitted with the adapter piece, the first protective component, the second protective component and the electrode tab support component, and cut along the AA direction.

[0038] Figure 5 A cross-sectional view of two electrode assemblies with a second type of electrode tab stacked along the thickness direction of the electrode assembly and after being fitted with an adapter piece, a first protective component, a second protective component and an electrode tab support component, and cut along the AA direction.

[0039] Figure 6 A cross-sectional view of two electrode assemblies with a third type of electrode tab stacked along the thickness direction of the electrode assembly and after being fitted with an adapter piece, a first protective component, a second protective component and an electrode tab support component, and cut along the AA direction.

[0040] Figure 7 This is a cross-sectional view along the AA direction of two electrode assemblies stacked along the thickness direction of the electrode assemblies in the first embodiment, and after they are in conjunction with the adapter piece, the first protective member, the second protective member and the tab support member.

[0041] Figure 8This is a cross-sectional view along the AA direction of the two electrode assemblies stacked along the thickness direction of the electrode assemblies in the second embodiment, and after they are in cooperation with the adapter piece, the first protective member, the second protective member and the electrode tab support member.

[0042] Figure 9 This is a cross-sectional view along the AA direction of the two electrode assemblies stacked along the thickness direction of the electrode assemblies in the third embodiment, and after they are in cooperation with the adapter piece, the first protective member, the second protective member and the electrode tab support member.

[0043] Figure 10 This is a cross-sectional view along the AA direction of two electrode assemblies stacked along the thickness direction of the electrode assemblies in the fourth embodiment, and after they are in cooperation with the adapter piece, the first protective member, the second protective member and the tab support member.

[0044] Figure 11 for Figure 10 A top view of a partial structure shown in the diagram;

[0045] Figure 12 This is a cross-sectional view along the AA direction of two electrode assemblies stacked along the thickness direction of the electrode assemblies in the fifth embodiment, and after they are in cooperation with the adapter piece, the first protective member, the second protective member and the tab support member.

[0046] Figure 13 This is a cross-sectional view along the AA direction of two electrode assemblies stacked along the thickness direction of the electrode assemblies in the sixth embodiment, and after they are in cooperation with the adapter piece, the first protective member, the second protective member and the tab support member.

[0047] Figure 14 This is a cross-sectional view along the AA direction of two electrode assemblies stacked along the thickness direction of the electrode assemblies in the seventh embodiment, and after they are in cooperation with the adapter piece, the first protective member, the second protective member and the tab support member.

[0048] Figure 15 This is a schematic diagram of the structure of the first protective element in one embodiment of this application;

[0049] Figure 16 for Figure 15 An enlarged schematic diagram of a portion of the structure G of the first protective component shown;

[0050] Figure 17 This is a schematic diagram of the structure of the second protective element in one embodiment of this application;

[0051] Figure 18 for Figure 17 An enlarged schematic diagram of a portion of the structure H of the second protective component shown;

[0052] Figure 19This is a three-dimensional structural diagram of the two electrode assemblies unfolded before being joined together in the eighth embodiment, and in cooperation with the adapter piece, the first protective component, and the second protective component;

[0053] Figure 20 This is a three-dimensional structural diagram of the two electrode assemblies unfolded before being joined together in the ninth embodiment, and in cooperation with the adapter piece, the first protective component, and the second protective component;

[0054] Figure 21 This is an exploded view of a battery in one embodiment of this application;

[0055] Figure 22 This is a schematic diagram of the electrical device in one embodiment of this application.

[0056] Icon labels:

[0057] 10000, Electrical appliances;

[0058] 1000, battery;

[0059] 100. Battery cell; 200. Outer casing;

[0060] 10. Electrode lead-out section; 20. Electrode assembly; 30. First protective component; 40. Second protective component; 50. Housing; 60. First solder mark; 70. Electrode tab support component;

[0061] 11. Adapter piece; 11a. Positive adapter piece; 11b. Negative adapter piece; 12. Terminal; 12a. Positive terminal; 12b. Negative terminal;

[0062] 20a, First electrode assembly; 20b, Second electrode assembly; 21, Main body; 211, First surface; 212, Second surface; 22, Tab; 22a, Positive tab; 22b, Negative tab; 221, Connecting part; 2211, Welding area; 2212, Non-welding area; 2213, First edge; 2214, Second edge; 2215, First inner surface; 222, Bending part; 2221, Second inner surface; 223, First dividing line;

[0063] 31. First adhesive portion; 32. First non-adhesive portion; 321. First part; 33. First substrate layer; 34. First adhesive layer; 35. Groove; 36. Through hole;

[0064] 41. Second adhesive portion; 42. Second non-adhesive portion; 421. Second part; 43. Second substrate layer; 44. Second adhesive layer;

[0065] 51. Shell; 52. End cap;

[0066] 210. Upper box; 220. Lower box;

[0067] X: Length direction of the electrode assembly; Y: Thickness direction of the electrode assembly; Z: Width direction of the electrode assembly. Detailed Implementation

[0068] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0069] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0074] Currently, from a market development perspective, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields. As the application areas of batteries continue to expand, the market demand for them is also constantly increasing.

[0075] A battery is formed by connecting multiple individual cells in series, parallel, or a hybrid configuration. A hybrid configuration refers to multiple individual cells connected in both series and parallel. Currently, during the manufacturing process of individual battery cells, after the tabs and electrode leads are welded together, an insulating tape is applied to the weld area to prevent weld slag from falling off later. Furthermore, to protect the tabs and prevent short circuits caused by inverted tab insertion, the insulating tape extends to the main body of the electrode assembly within the battery cell. However, this method of applying the tape may cause abnormal adhesion between the insulating tape and the tab / main body, leading to the tape pulling on the tabs during subsequent core assembly and causing the tabs to crack.

[0076] To address the aforementioned issues, one existing solution is to design the adhesive portions of the insulating tape to be spaced out, omitting the adhesive portion at the point where the middle section contacts the electrode tab. This solution can resolve the problem of the electrode tab cracking due to stretching, but it introduces another problem: when the insulating tape is taut and the core is closed, the adhesive portions at both ends of the insulating tape will pull against each other, potentially causing damage to the outer diaphragm of the main body.

[0077] Please see Figures 1 to 14In view of the above two situations, the applicant, after in-depth research, designed a battery cell 100. The battery cell 100 includes a housing 50, an electrode lead-out portion 10, an electrode assembly 20, a first protective member 30, and a second protective member 40. The electrode assembly 20, the first protective member 30, and the second protective member 40 are all disposed inside the housing 50. The electrode lead-out portion 10 is connected to the tab 22 and is at least partially located outside the housing 50, and is used to draw out the electrical energy of the battery cell 100. The electrode assembly 20 includes a main body portion 21 and a tab 22. The tab 22 includes a connecting portion 221 and a bending portion 222. The connecting portion 221 is used for electrical connection with the electrode lead-out portion 10, and the bending portion 222 is connected between the main body portion 21 and the connecting portion 221. The first protective member 30 has a first adhesive portion 31 and a first non-adhesive portion 32, and the second protective member 40 has a second adhesive portion 41 and a second non-adhesive portion 42. The first adhesive portion 31 is at least partially bonded to the connecting portion 221, and the second adhesive portion 41 is at least partially bonded to the main body portion 21. Both the first non-adhesive portion 32 and the second non-adhesive portion 42 cover the partial bending portion 222 and are at least partially overlapped.

[0078] like Figures 1 to 3 As shown, specifically, the outer casing 50 includes a housing 51 and an end cap 52. The end cap 52 cooperates with the housing 51 to form a sealed environment with a receiving cavity. The formed receiving cavity can be used to accommodate the electrode assembly 20, the first protective element 30, the second protective element 40, the electrolyte, and other components. The end cap 52 is also used to house the electrode lead-out portion 10, the explosion-proof valve, and other components. The housing 51 and the end cap 52 can be independent components. An opening can be provided on the housing 51, and a closed environment can be formed by closing the opening with the end cap 52. Alternatively, the end cap 52 and the housing 51 can be integrated.

[0079] like Figures 1 to 3 As shown, the electrode assembly 20 is the main component in the battery cell 100 where electrochemical reactions occur. Typically, the electrode assembly 20 includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the positive and negative electrode, insulating and isolating them while allowing ions to pass through. The portion of the positive electrode containing positive active material, the portion of the negative electrode containing negative active material, and the separator together form the main body 21 of the electrode assembly 20. The portion of the positive electrode without active material forms a positive electrode tab, and the portion of the negative electrode without active material forms a negative electrode tab. Multiple positive electrode tabs are stacked along the stacking direction of the positive and negative electrode (generally, this direction is the thickness direction Y of the electrode assembly 20) to form positive electrode tabs, and multiple negative electrode tabs are stacked along the stacking direction of the positive and negative electrode to form negative electrode tabs. During the charging and discharging process of the battery cell 100, the positive and negative active materials react with the electrolyte.

[0080] like Figures 4 to 7As shown, the tab 22 protrudes from one end of the main body 21 along the width direction Z of the electrode assembly 20. The tab 22 has a connecting portion 221 and a bent portion 222. The bent portion 222 is bent relative to the connecting portion 221 and connects between the connecting portion 221 and the main body 21. The connecting portion 221 is typically welded to the electrode lead-out portion 10 for electrical connection. The connecting portion 221 faces the surface of the main body 21 parallel or approximately parallel to the thickness direction Y of the electrode assembly 20. In addition, to improve the support effect of the tab 22, a tab support member 70 can be installed between the surface of the main body 21 where the tab 22 is located and the connecting portion 221 to support the tab 22.

[0081] Specifically, the connecting portion 221 has a first inner surface 2215 facing the electrode support 70, and the bending portion 222 has a second inner surface 2221 facing the electrode support 70 and disposed along the thickness direction Y of the electrode assembly 20. The second inner surface 2221 is bent relative to the first inner surface 2215 as a folded surface or an arc surface. When the second inner surface 2221 is bent relative to the first inner surface 2215 as a folded surface (e.g. Figure 4 and Figure 6 As shown), the fold line formed between the second inner surface 2221 and the first inner surface 2215 is the dividing line between the connecting part 221 and the bent part 222 (that is, the first dividing line 223 mentioned below). When the second inner surface 2221 is bent into an arc shape relative to the first inner surface 2215 (as shown), Figure 5 As shown in the diagram, the starting line where the curvature of the second inner surface 2221 begins to change continuously relative to the first inner surface 2215 is the boundary line between the connecting portion 221 and the bending portion 222. It can be understood that the boundary line between the connecting portion 221 and the bending portion 222 is along the length direction X of the electrode assembly 20 (e.g., ...). Figure 3 (As shown) extension.

[0082] like Figures 1 to 3 As shown, the electrode lead-out portion 10 is a component electrically connected to the tab 22 and capable of drawing electrical energy from the battery cell 100. As an example, the electrode lead-out portion 10 includes an adapter piece 11 and a terminal post 12, with the adapter piece 11 electrically connected between the tab 22 and the terminal post 12; alternatively, the electrode lead-out portion 10 includes a terminal post 12, which is directly electrically connected to the tab 22. For ease of explanation, the following embodiments will be described using the example of the electrode lead-out portion 10 including the adapter piece 11 and the terminal post 12.

[0083] Generally, the tab 22 includes a positive tab 22a and a negative tab 22b, the adapter 11 includes a positive adapter 11a and a negative adapter 11b, and the terminal 12 includes a positive terminal 12a and a negative terminal 12b. The positive adapter 11a is electrically connected between the positive tab 22a and the positive terminal 12a, and the negative adapter 11b is electrically connected between the negative tab 12b and the negative terminal 12b to form a current loop.

[0084] It is worth mentioning that the positive electrode tab 22a and the negative electrode tab 22b can have the same or different structures, and the positive electrode adapter 11a and the negative electrode adapter 11b can have the same or different structures. The specific structure can be set according to the requirements.

[0085] like Figure 2 and Figure 3 As shown, the first protective element 30 and the second protective element 40 can be, but are not limited to, insulating tape, and their structures can be the same or different, depending on the requirements. The first protective element 30 and the second protective element 40 can be provided on the positive electrode tab 22a and / or the negative electrode tab 22b. The first protective element 30 and the second protective element 40 provided on the positive electrode tab 22a are used to protect the positive electrode tab 22a, and the first protective element 30 and the second protective element 40 provided on the negative electrode tab 22b are used to protect the negative electrode tab 22b.

[0086] like Figure 9 As shown, optionally, the first adhesive portion 31 is entirely adhered to the connecting portion 221. For example... Figures 4 to 8 , Figure 10 and Figure 11 As shown, preferably, the first adhesive portion 31 is partially bonded to the connecting portion 221, and the remaining portion is bonded to the adapter piece 11 and / or the bending portion 222, etc., to increase the bonding area of ​​the first adhesive portion 31 and reduce the risk of the first protective member 30 falling off.

[0087] like Figure 7 and Figure 13 As shown, optionally, the second adhesive portion 41 is entirely bonded to the main body portion 21. For example... Figures 8 to 10 As shown, preferably, the second adhesive portion 41 is partially bonded to the main body portion 21, and the remaining portion is bonded to the tab 22, so as to increase the bonding area of ​​the second protective member 40 and prevent the second protective member 40 from falling off.

[0088] like Figure 4As shown, in this application, the first adhesive portion 31 is at least partially bonded to the connecting portion 221, and the second adhesive portion 41 is at least partially bonded to the main body portion 21. Both the first non-adhesive portion 32 and the second non-adhesive portion 42 cover the partially bent portion 222 and are at least partially overlapped. In this way, the first protective member 30 and the second protective member 40 cooperate to cover the tab 22, thereby protecting the tab 22. However, since the first non-adhesive portion 32 and the second non-adhesive portion 42 are overlapped between the tab 22 and the main body portion 21, and there is no adhesive between the first non-adhesive portion 32 and the second non-adhesive portion 42 and they are not connected, the first non-adhesive portion 32 and the second non-adhesive portion 42 will not pull on each other during core assembly. This reduces the possibility of the first protective member 30 and the second protective member 40 pulling on the tab 22 and the separator, reduces the risk of the tab 22 cracking and the separator being damaged, and improves the working performance of the battery cell 100.

[0089] In some embodiments, the electrode lead-out portion 10 includes an adapter piece 11 and an electrode post 12, and the connecting portion 221 includes a welding area 2211. The welding area 2211 is welded to the adapter piece 11 to form a first weld mark 60, and the first adhesive portion 31 covers and adhesives the welding area 2211. This design can fix the welding slag and reduce the risk of welding slag falling off the welding area 2211.

[0090] Please see Figure 4 and Figure 9 In some embodiments, the electrode lead-out portion 10 further includes a non-welding area 2212, which is arranged circumferentially around the welding area 2211, or the non-welding area 2212 is arranged along the length direction and / or width direction of the electrode tab 22 on at least one side of the welding area 2211. The first adhesive portion 31 covers and adhesively bonds the non-welding area 2212, thereby increasing the adhesive area of ​​the first adhesive portion 31, thereby playing a better role in fixing the first protective member 30 and reducing the risk of the first protective member 30 falling off.

[0091] It can be understood that the length direction of the tab 22 is the same as the extension direction of the tab 22 (e.g., Figure 4 As shown by the double-headed arrow N), the width direction of the tab 22 is consistent with the length direction X of the electrode assembly 20, as shown by the double-headed arrow N. Figure 3 As shown) the length direction perpendicular to the tab 22. Figure 4 , Figure 10 and Figure 11 As shown, the first adhesive portion 31 is at least partially bonded to the adapter piece 11.

[0092] like Figure 10 and Figure 11As shown, the dividing line between the connecting part 221 and the bending part 222 is defined as the first dividing line 223. The connecting part 221 has a first edge 2213 disposed opposite to the first dividing line 223, and a second edge 2214 that connects the first edge 2213 and the first dividing line 223. The first adhesive part 31 extends to the outside of the first edge 2213 and the second edge 2214 and is bonded to the adapter piece 11.

[0093] By designing the first adhesive part 31 to be bonded to the adapter piece 11, on the one hand, the bonding area of ​​the first adhesive part 31 can be increased, thereby playing a better role in fixing the first protective member 30 and the electrode tab 22 and reducing the risk of the first protective member 30 falling off. On the other hand, the first adhesive part 31 can cover the edge of the connecting part 221 to prevent the electrode tab 22 from being inserted upside down.

[0094] like Figure 12 As shown, in some embodiments, the first adhesive portion 31 extends to the bend portion 222, and the first adhesive portion 31 covers and adhesively bonds a portion of the bend portion 222. That is, the first adhesive portion 31 extends beyond the first dividing line 223 and is bonded to a portion of the bend portion 222, thereby giving the first protective member 30 and the tab 22 a larger bonding area and preventing the first protective member 30 from falling off during the production process.

[0095] like Figure 12 As shown, the length of the first adhesive portion 31 bonded to the bent portion 222 is 'a', where 0 mm < a ≤ 10 mm. Specifically, 'a' can be, but is not limited to, 1 mm, 3 mm, 5 mm, 7 mm, 10 mm, etc., and can be set according to actual needs.

[0096] It can be understood that the length of the first adhesive portion 31 bonded to the bent portion 222 is the same as the extension direction of the first adhesive portion 31 in the tab 22 (e.g., Figure 4 The size of the tab 222 bonded to the bent portion (as indicated by the double-headed arrow N) is too large. If this size is too large, it will affect the bending of the tab 22 during the core assembly process and will easily pull on the tab 22, causing the tab 22 to crack. If this size is too small, it will not be able to better fix the first protective component 30.

[0097] In view of this, the design is 0mm<a≤10mm, which can ensure that the first protective component 30 has a better fixing effect, while also reducing the risk of the tab 22 cracking and improving the working performance of the battery cell 100.

[0098] like Figure 4 , Figure 7 , Figure 8 , Figure 12 and Figure 13As shown, in some embodiments, the main body 21 has a first surface 211 on which the tab 22 is disposed, and a second surface 212 located in the thickness direction Y of the electrode assembly 20, the first surface 211 and the second surface 212 being disposed adjacent to each other; the second adhesive portion 41 is at least partially bonded to the second surface 212.

[0099] It is understood that the first surface 211 is the surface on the main body 21 where the tab 22 protrudes. The first surface 211 is disposed along the width direction Z of the electrode assembly 20. The second surface 212 is typically the surface with the largest area of ​​the electrode assembly 20. The second surface 212 is disposed along the thickness direction Y of the electrode assembly 20. The second adhesive portion 41 is at least partially bonded to the second surface 212. The second surface 212 has a large area, which facilitates the bonding of the second protective member 40.

[0100] Optionally, such as Figure 13 As shown, the second adhesive portion 41 is entirely bonded to the second surface 212. Preferably, the second adhesive portion 41 is partially bonded to the second surface 212, and the remaining portion is bonded to the first surface 211 (e.g., ...). Figure 7 (as shown), and / or the remaining portion is bonded to the bend 222 (as shown). Figure 4 , Figure 8 and Figure 12 (as shown), etc., to increase the bonding area of ​​the second adhesive part 41 and prevent the second protective part 40 from falling off.

[0101] like Figure 4 , Figure 8 and Figure 12 As shown, the second adhesive portion 41 further extends to the bend 222, and the second adhesive portion 41 covers and bonds part of the bend 222. That is, the second adhesive portion 41 extends beyond the second surface 212 and onto the bend 222 of the tab 22. In this way, the bonding area between the second adhesive portion 41 and the electrode assembly 20 is increased, thereby better securing the second protective member 40 and the electrode assembly 20 and reducing the risk of the second protective member 40 falling off. In addition, this method can also protect the tab 22 and prevent the root of the bend 222 from breaking.

[0102] like Figure 4 and Figure 8 As shown, further, the length of the second adhesive part 41 bonded to the bending part 222 is b, b≤T / 2, where T is the length of the tab 22, and / or b≥10mm.

[0103] Specifically, b can be, but is not limited to, T / 2, T / 3, T / 4, T / 5, etc., and / or b can be, but is not limited to, 10mm, 11mm, 12mm, etc., which can be set according to actual needs.

[0104] It can be understood that the length of the tab 22 is the length of the surface of the tab 22 facing the tab support 70 in the direction of tab 22 extension (e.g., Figure 4 The dimensions shown by the double-headed arrow N (as indicated by the double-headed arrow N) are as follows: Figure 4 The sum of T1, T2, and T3. The length of the second adhesive part 41 bonded to the bending part 222 is the extension direction of the second adhesive part 41 in the tab 22 (e.g., Figure 4 The dimensions of the material bonded to the bend 222 (as indicated by the double-headed arrow N).

[0105] If the bonding length between the second bonding portion 41 and the bending portion 222 is too short, the bonding effect will be poor, and it will be easy to detach from the bending portion 222. Therefore, b is designed to be ≥ 10 mm. If the bonding length between the second bonding portion 41 and the bending portion 222 is too long, it will easily pull on the outer membrane of the main body portion 21 during the core assembly process, resulting in membrane damage. In view of this, b is designed to be ≤ T / 2, which can ensure that the second protective component 40 has a better fixing effect, while also reducing the risk of membrane damage and improving the working performance of the battery cell 100.

[0106] Please see Figure 8 In some embodiments, the second adhesive portion 41 is located on the second surface 212 and the distance from the edge away from the first surface 211 to the first surface 211 is m, 3mm≤m≤d / 3, where d is the width of the main body portion 21.

[0107] Specifically, m can be, but is not limited to, 3mm, d / 3, etc., and can be set according to actual needs.

[0108] It can be understood that the width of the main body 21 is the dimension of the main body 21 in the width direction Z of the electrode assembly 20.

[0109] m represents the length of the second adhesive part 41 bonded to the second surface 212. If m is too small, the length of the second adhesive part 41 bonded to the second surface 212 will be small, which will not be able to guarantee the fixing effect of the second protective member 40. If m is too large, the area of ​​the second surface 212 of the main body 21 will be large, which may affect the effect of the main body 21 being wetted with electrolyte.

[0110] In view of this, by designing 3mm≤m≤d / 3, it is possible to ensure that the second protective member 40 has a better fixing effect, while also enabling the electrolyte to fully contact the second surface 212 and wet the main body 21.

[0111] Please see Figure 4 and Figure 8 In some embodiments, the length of the overlapping portion of the first non-adhesive portion 32 and the second non-adhesive portion 42 is e, T / 5≤e≤T / 2, where T is the length of the tab 22, and / or e≥3mm.

[0112] Specifically, 'e' can be, but is not limited to, T / 5, T / 4, T / 3, T / 2, etc., and / or 'e' can be, but is not limited to, 3mm, 4mm, 5mm, etc. The specific value can be set according to actual needs.

[0113] It can be understood that the length of the overlapping portion of the first non-adhesive portion 32 and the second non-adhesive portion 42 is the length of the extension direction of the first non-adhesive portion 32 and the second non-adhesive portion 42 in the tab 22 (e.g., Figure 4 The overlapping dimension (indicated by the double-headed arrow N) is too small. If this dimension is too small, the overlapping area may shrink when the core is assembled and the tab 22 is bent, exposing the tab 22 and failing to protect it. By designing e ≥ T / 5 and / or e ≥ 3 mm, the first non-adhesive portion 32 and the second non-adhesive portion 42 have a more suitable overlapping dimension, improving the shielding effect of the overlapping portion on the tab 22 and achieving better protection. Furthermore, if the length of the overlapping portion of the first non-adhesive portion 32 and the second non-adhesive portion 42 is too large, it will lead to material waste. Therefore, e ≤ T / 2 is designed to save material on the first protective component 30 and the second protective component.

[0114] like Figure 8 and Figure 14 As shown, in some embodiments, the first adhesive portion 31 and the second non-adhesive portion 42 are spaced apart, and / or the first non-adhesive portion 32 and the second adhesive portion 41 are spaced apart to prevent the first protective member 30 and the second protective member 40 from sticking together, thereby reducing the pulling of the first protective member 30 and / or the second protective member 40 on the tab 22.

[0115] The overlapping portions of the first non-adhesive portion 32 and the second non-adhesive portion 42 are defined as the first portion 321 and the second portion 421, respectively. It can be understood that the first portion 321 belongs to the first protective member 30, and the second portion 421 belongs to the second protective member 40. In some embodiments, such as... Figure 8 As shown, in the thickness direction of the tab 22, the second portion 421 can be disposed away from the bend 222 relative to the first portion 321, that is, the first portion 321 is closer to the tab 22. In other embodiments, such as Figure 14 As shown, in the thickness direction of the tab 22, the first part 321 is positioned away from the bend 222 relative to the second part 421, meaning the second part 421 is closer to the tab 22. The overlapping arrangement of the first part 321 and the second part 421 protects the tab 22 while ensuring that the first protective member 30 and the second protective member 40 do not pull on each other.

[0116] Preferred, such as Figure 8As shown, the first part 321 is positioned away from the bend 222 relative to the second part 421. When overlapping, the first part 321 is positioned away from the bend 222 relative to the second part 421, so the second part 421 is closer to the tab 22, thereby reducing the risk of the second part 421 lifting up, and thus reducing the risk of the second protective part 40 falling off or floating up during product manufacturing, transportation, etc., and interfering with the equipment.

[0117] Please see Figure 10 and Figures 15 to 18 In some embodiments, the first protective member 30 includes a first substrate layer 33 and a first adhesive layer 34. The first adhesive layer 34 is disposed on the surface of the first substrate layer 33 facing the tab 22, and the portion of the first substrate layer 33 with the first adhesive layer 34 forms a first adhesive portion 31 with the first adhesive layer 34. The remaining portion of the first substrate layer 33 without the first adhesive layer 34 forms a first non-adhesive portion 32. The second protective member 40 includes a second substrate layer 43 and a second adhesive layer 44. The second adhesive layer 44 is disposed on the surface of the second substrate layer 43 facing the main body portion 21, and the portion of the second substrate layer 43 with the second adhesive layer 44 forms a second adhesive portion 41 with the second adhesive layer 44. The remaining portion of the second substrate layer 43 without the second adhesive layer 44 forms a second non-adhesive portion 42.

[0118] The first substrate layer 33 primarily supports the first adhesive layer 34, and the second substrate layer 43 primarily supports the second adhesive layer 44. Both the first substrate layer 33 and the second substrate layer 43 can be made of polypropylene, polyester, or other materials. The first adhesive layer 34 can be formed by curing an colloid applied to the first substrate layer 33, or it can be formed by bonding an adhesive layer to the first substrate layer 33. Similarly, the second adhesive layer 44 can be formed by curing an colloid applied to the second substrate layer 43, or it can be formed by bonding an adhesive layer to the second substrate layer 43.

[0119] The first adhesive layer 34 is disposed on the side surface of the first substrate layer 33 facing the tab 22, and the portion of the first substrate layer 33 with the first adhesive layer 34 is bonded to the first adhesive portion 31 formed by the first adhesive layer 34 and connected to the connection portion 221, which can fix the welding slag formed by welding the tab 22 and the electrode lead-out portion 10.

[0120] The remaining portion of the first substrate layer 33 without the first adhesive layer 34 forms a first non-adhesive portion 32, and the remaining portion of the second substrate layer 43 without the second adhesive layer 44 forms a second non-adhesive portion 42. Both the first non-adhesive portion 32 and the second non-adhesive portion 42 are free ends, and the first non-adhesive portion 32 is not restricted by the force of the second protective member 40, and the second non-adhesive portion 42 is not restricted by the force of the first protective member 30. Therefore, when the core is closed, the first non-adhesive portion 32 and the second non-adhesive portion 42 can move relative to each other as the tab 22 bends, thereby reducing the possibility that the first protective member 30 and the second protective member 40 will pull the tab 22 and the diaphragm.

[0121] Please see Figure 10 and Figures 15 to 18 In some embodiments, the thickness of the first substrate layer 33 is h1, 10μm≤h1≤100μm; and / or, the thickness of the second substrate layer 43 is h2, 10μm≤h2≤100μm; and / or, the thickness of the first adhesive layer 34 is h3, 10μm≤h3≤100μm; and / or, the thickness of the second adhesive layer 44 is h4, 10μm≤h4≤100μm; and / or, the first substrate layer 33 is provided with a groove 35 and / or a through hole 36 at the junction of the connecting portion 221 and the bending portion 222; and / or, the main body portion 21 has a first surface 211 on which the tab 22 is provided, and a second surface 212 located in the thickness direction Y of the electrode assembly 20, and the second substrate layer 43 is provided with a groove 35 and / or a through hole 36 at the junction of the first surface 211 and the second surface 212.

[0122] Specifically, h1 can be, but is not limited to, 10μm, 30μm, 50μm, 60μm, 100μm, etc.; h2 can be, but is not limited to, 10μm, 30μm, 50μm, 60μm, 100μm, etc.; h3 can be, but is not limited to, 10μm, 30μm, 50μm, 60μm, 100μm, etc.; h4 can be, but is not limited to, 10μm, 30μm, 50μm, 60μm, 100μm, etc.

[0123] If the thickness of the first substrate layer 33 is too large, the stiffness of the first protective element 30 will increase, making it difficult to bend during core assembly and posing a risk of damage to the tabs 22. If the thickness of the first substrate layer 33 is too small, the insulation and protection capabilities of the first protective element 30 will be compromised. In this application, by designing 10μm≤h1≤100μm, the first substrate layer 33 has a certain thickness, which facilitates bending and provides good insulation and protection. Similarly, by designing 10μm≤h2≤100μm, 10μm≤h3≤100μm, and 10μm≤h4≤100μm, the second substrate, the first adhesive layer 34, and the second adhesive layer 44 all have a certain thickness, making the first protective element 30 and the second protective element 40 easy to bend and providing good insulation and protection.

[0124] As an example, the groove 35 on the first substrate layer 33 extends along the width direction of the first substrate layer 33, and the groove 35 on the second substrate layer 43 extends along the width direction of the second substrate layer 43. The width directions of both the first substrate and the second substrate are parallel to or coincide with the width direction of the tab 22.

[0125] As an example, the first substrate layer 33 may have one or more through holes 36 at the junction of the connecting portion 221 and the bending portion 222. If there are multiple through holes 36 on the first substrate layer 33, all the through holes 36 on the first substrate layer 33 are spaced apart along the width direction of the first substrate layer 33. The second substrate layer 43 may have one or more through holes 36 at the junction of the connecting portion 221 and the bending portion 222. If there are multiple through holes 36 on the second substrate layer 43, all the through holes 36 on the second substrate layer 43 are spaced apart along the width direction of the second substrate layer 43.

[0126] The through holes 36 and / or grooves 35 on the first substrate layer 33 facilitate bending of the first substrate layer 33. Similarly, the through holes 36 or grooves 35 on the second substrate layer 43 also facilitate bending of the second substrate layer 43.

[0127] Please see Figure 2 , Figure 4 , Figure 10 , Figure 19 and Figure 20 The battery cell 100 includes adjacent first electrode assembly 20a and second electrode assembly 20b. Optionally, the two first protective members 30 connected to the two tabs 22 of the same polarity in the first electrode assembly 20a and the second electrode assembly 20b can be separate and spaced apart (e.g., Figure 10 and Figure 19 ), or it can be set up as a whole (such as Figure 4 and Figure 20 ).

[0128] It should be noted that the two tabs 22 with the same polarity can be the positive tab 22a of the first electrode assembly 20a and the positive tab 22a of the second electrode assembly 20b, or they can be the negative tab 22b of the first electrode assembly 22a and the negative tab 22b of the second electrode assembly 20b. This arrangement can be applied only to the first protective element 30 of the positive tab 22a, only to the first protective element 30 of the negative tab 22b, or to both; it is not mandatory here. Taking the positive tab 22a as an example, the first protective element 30 bonded to the positive tab 22a in the first electrode assembly 22a and the first protective element 30 bonded to the positive tab 22a in the second electrode assembly 20b can be separate and spaced apart, or they can be integrated into one piece.

[0129] Please see Figure 4 and Figure 20 Preferably, the two first protective members 30 connected to the two tabs 22 of the same polarity in the first electrode assembly 20a and the second electrode assembly 20b are integrally formed. This design can reduce assembly steps and reduce assembly difficulty.

[0130] Please see Figure 21 This application also provides a battery 1000, which includes a battery cell 100 as described in any of the above embodiments. The battery 1000 in this application has the effects of any of the above embodiments, and therefore will not be described again here.

[0131] In some embodiments, the battery 1000 further includes an outer casing 200, which includes an upper casing 210 and a lower casing 220. The upper casing 210 and the lower casing 220 enclose a space for placing the battery cell 100, so as to reduce external interference to the battery cell 100.

[0132] Please see Figure 22 This application also provides an electrical device 10000, which includes a battery 1000 as described in any of the above embodiments, the battery 1000 being used to provide electrical energy to the electrical device 10000.

[0133] The electrical device 10000 can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0134] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical device 10000 described above.

[0135] In the aforementioned battery cell 100, battery 1000, and power device 1000, the first adhesive portion 31 is at least partially bonded to the connecting portion 221, and the second adhesive portion 41 is at least partially bonded to the main body portion 21. Both the first non-adhesive portion 32 and the second non-adhesive portion 42 cover the partially bent portion 222 and are at least partially overlapped. In this way, the first protective member 30 and the second protective member 40 cooperate to jointly cover the tab 22, thereby protecting the tab 22. However, since the first non-adhesive portion 32 and the second non-adhesive portion 42 are overlapped between the tab 22 and the main body portion 21, and there is no adhesive between the first non-adhesive portion 32 and the second non-adhesive portion 42 and they are not connected, the first non-adhesive portion 32 and the second non-adhesive portion 42 will not pull against each other during core assembly. This reduces the possibility of the first protective member 30 and the second protective member 40 pulling on the tab 22 and the separator, lowers the risk of tab 22 cracking and separator damage, and improves the working performance of the battery cell 100.

[0136] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0137] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: Electrode lead-out section (10) is used to draw out the electrical energy of the battery cell; An electrode assembly (20) includes a main body (21) and a tab (22). The tab (22) includes a connecting portion (221) and a bending portion (222). The connecting portion (221) is used for electrical connection with the electrode lead-out portion (10), and the bending portion (222) is connected between the main body (21) and the connecting portion (221). The first protective member (30) and the second protective member (40) have a first adhesive portion (31) and a first non-adhesive portion (32), and the second protective member (40) have a second adhesive portion (41) and a second non-adhesive portion (42). The first adhesive portion (31) is at least partially bonded to the connecting portion (221), and the second adhesive portion (41) is at least partially bonded to the main body portion (21). Both the first non-adhesive portion (32) and the second non-adhesive portion (42) cover a portion of the bending portion (222) and are at least partially overlapped.

2. The battery cell according to claim 1, characterized in that, The electrode lead-out portion (10) includes an adapter piece (11), the connecting portion (221) includes a welding area (2211), the welding area (2211) is welded to the adapter piece (11), and the first adhesive portion (31) covers and adhesives the welding area (2211).

3. The battery cell according to claim 2, characterized in that, The first adhesive part (31) is bonded to the adapter piece (11).

4. The battery cell according to claim 1, characterized in that, The first adhesive portion (31) extends to the bent portion (222), and the first adhesive portion (31) covers and adhesively bonds part of the bent portion (222).

5. The battery cell according to claim 4, characterized in that, The length of the first adhesive part (31) bonded to the bending part (222) is a, where 0 mm < a ≤ 10 mm.

6. The battery cell according to claim 1, characterized in that, The main body (21) has a first surface (211) on which the tab (22) is disposed, and a second surface (212) located in the thickness direction (Y) of the electrode assembly (20), wherein the first surface (211) and the second surface (212) are disposed adjacent to each other; the second adhesive portion (41) is at least partially bonded to the second surface (212).

7. The battery cell according to claim 6, characterized in that, The second adhesive portion (41) extends to the bent portion (222), and the second adhesive portion (41) covers and adhesively bonds part of the bent portion (222).

8. The battery cell according to claim 7, characterized in that, The second adhesive part (41) is bonded to the tab (22) for a length of b, b≤T / 2, where T is the length of the tab (22), and / or b≥10mm.

9. The battery cell according to claim 6, characterized in that, The second adhesive part (41) is located on the second surface (212) and the distance from the edge away from the first surface (211) to the first surface (211) is m, 3mm≤m≤d / 3, where d is the width of the main body part (21).

10. The battery cell according to claim 1, characterized in that, The length of the overlapping portion of the first non-adhesive portion (32) and the second non-adhesive portion (42) is e, T / 5≤e≤T / 2, where T is the length of the tab (22), and / or e≥3mm.

11. The battery cell according to claim 1, characterized in that, The first adhesive portion (31) and the second non-adhesive portion (42) are spaced apart, and / or the first non-adhesive portion (32) and the second adhesive portion (41) are spaced apart.

12. The battery cell according to claim 1, characterized in that, The overlapping portions of the first non-adhesive portion (32) and the second non-adhesive portion (42) are defined as the first part (321) and the second part (421), respectively. In the thickness direction of the tab (22), the first part (321) is disposed away from the bending portion (222) relative to the second part (421).

13. The battery cell according to claim 1, characterized in that, The first protective member (30) includes a first substrate layer (33) and a first adhesive layer (34). The first adhesive layer (34) is disposed on the side surface of the first substrate layer (33) facing the tab (22). The portion of the first substrate layer (33) with the first adhesive layer (34) forms the first adhesive portion (31) together with the first adhesive layer (34). The remaining portion of the first substrate layer (33) without the first adhesive layer (34) forms the first non-adhesive portion (32). The second protective member (40) includes a second substrate layer (43) and a second adhesive layer (44). The second adhesive layer (44) is disposed on the side surface of the second substrate layer (43) facing the main body (21). The portion of the second substrate layer (43) with the second adhesive layer (44) forms the second adhesive portion (41) together with the second adhesive layer (44). The remaining portion of the second substrate layer (43) without the second adhesive layer (44) forms the second non-adhesive portion (42).

14. The battery cell according to claim 13, characterized in that, The thickness of the first substrate layer (33) is h1, 10μm≤h1≤100μm; And / or, the thickness of the second substrate layer (43) is h2, 10μm≤h2≤100μm; And / or, the thickness of the first adhesive layer (34) is h3, 10μm≤h3≤100μm; And / or, the thickness of the second adhesive layer (44) is h4, 10μm≤h4≤100μm; And / or, the first substrate layer (33) is provided with a groove (35) and / or a through hole (36) at the junction of the connecting portion (221) and the bending portion (222); And / or, the main body (21) has a first surface (211) on which the tab (22) is disposed, and a second surface (212) located in the thickness direction (Y) of the electrode assembly (20), and the second substrate layer (43) is provided with a groove (35) and / or a through hole (36) at the junction of the first surface (211) and the second surface (212).

15. The battery cell according to any one of claims 1 to 14, characterized in that, The battery cell includes an adjacent first electrode assembly (20a) and a second electrode assembly (20b), and the two first protective members (30) in the first electrode assembly (20a) and the second electrode assembly (20b) are integrally formed with the two tabs (22) of the same polarity connected to each other.

16. A battery, characterized in that, The battery comprises a battery cell as described in any one of claims 1 to 15 above.

17. An electrical device, characterized in that, The electrical device includes the battery as described in claim 16.

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