Battery cell, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device, and belongs to the technical field of battery manufacturing. The battery cell comprises: a top cover assembly comprising a cover body, a pole and a first insulating part; the battery cell is provided with a tab; the adapter comprises a tab connecting part, a pole connecting part and a fusing part; wherein the first insulating part comprises a main body part and an isolation part, the main body part insulates and isolates the cover body from the battery cell in the thickness direction of the cover body, and the isolation part is used for abutting against the tab, so that the pole connecting part is prevented from being in lap joint with the tab, or the pole is prevented from being in lap joint with the tab. The utility model further provides a battery and a power utilization device, and the battery and the power utilization device comprise the battery monomer and have good safety performance.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular, to a battery cell, a battery, and an electrical device. Background Art

[0002] A secondary battery generally includes a battery cell, a top cover assembly, and a connecting piece. The tab of the battery cell is electrically connected to the terminal of the top cover through the connecting piece. In order to improve the safety performance of the secondary battery, a fusing portion is provided on the connecting piece. When the secondary battery is overcharged or an abnormality occurs, the fusing portion fuses to disconnect the electrical connection between the tab and the terminal, preventing the secondary battery from exploding.

[0003] However, after the secondary battery is assembled, the tab may overlap on the connecting piece due to reasons such as welding misalignment or excessive width, resulting in the failure of the fusing portion and posing a great safety hazard. Summary of the Utility Model

[0004] To this end, the present application provides a battery cell, a battery, and an electrical device, which have good safety performance.

[0005] The battery cell according to an embodiment of the first aspect of the present application includes: a top cover assembly, including a cover body, a terminal, and a first insulating member, the cover body is provided with a terminal hole, and the terminal is disposed in the terminal hole; a battery cell, a tab is provided on a side of the battery cell facing the cover body; a connecting member, including a tab connecting portion, a terminal connecting portion, and a fusing portion, the fusing portion is disposed between the tab connecting portion and the terminal connecting portion, the tab connecting portion is electrically connected to the tab, and the terminal connecting portion is electrically connected to the terminal; wherein, the first insulating member includes a main body portion and an isolating portion, along the thickness direction of the cover body, the main body portion insulates and isolates the cover body from the battery cell, and the isolating portion is used to abut against the tab to prevent the terminal connecting portion from overlapping with the tab, or prevent the terminal from overlapping with the tab.

[0006] Optionally, the main body portion is provided with a first opening, the first opening is correspondingly disposed with the terminal, the isolating portion is disposed near the first opening and extends circumferentially around the first opening.

[0007] Optionally, along the width direction of the cover body, the isolating portion is disposed on one side of the first opening, the tab extends from one side of the cover body to the lower side of the tab connecting portion, and the isolating portion is disposed on the same side as the tab.

[0008] Optionally, there are two isolation parts, which are oppositely arranged on both sides of the first opening along the width direction of the cover body. At least part of the pole connection part is exposed between the two isolation parts, so as to facilitate the welding connection between the pole and the pole connection part. The pole ear extends from at least one side of the cover body to the lower side of the pole ear connection part.

[0009] Optionally, an installation gap is formed between the isolation part and the main body part. The isolation part is provided with a second opening corresponding to the first opening. The pole connection part is inserted into the installation gap, and at least part of the pole connection part is exposed through the second opening, so as to facilitate the welding connection between the pole and the pole connection part. The pole ear extends from at least one side of the cover body to the lower side of the pole ear connection part.

[0010] Optionally, the isolation part includes an abutting section and a connecting section. The abutting section is used to abut against the pole ear, and the connecting section connects the main body part and the abutting section. The connecting section is arranged close to the first opening, and the abutting section extends from the connecting section towards the inside of the first opening.

[0011] Optionally, the connecting section extends towards the center of the first opening, and the surface of the abutting section close to the pole ear is flush with the main body part.

[0012] Optionally, the connecting section extends obliquely away from the main body part, and the surface of the abutting section close to the pole ear protrudes from the main body part.

[0013] Optionally, the abutting section is arranged parallel to the main body part, and the included angle between the connecting section and the abutting section is α, where 95° ≤ α ≤ 160°.

[0014] Optionally, in the thickness direction of the cover body, the projections of the isolation part and the pole connection part do not coincide.

[0015] Optionally, in the thickness direction of the cover body, the projections of the isolation part and the pole connection part partially coincide.

[0016] Optionally, a welding mark is formed at the welding place between the pole and the pole connection part. In the thickness direction of the cover body, the projections of the isolation part and the welding mark do not coincide.

[0017] Optionally, along the length direction of the cover body, the length of the isolation part is L, and along the width direction of the cover body, the width of the isolation part is W, satisfying:

[0018] 10mm ≤ L ≤ 30mm, 3mm ≤ W ≤ 10mm.

[0019] Optionally, the top cover assembly further includes: a second insulating member, including an insulating portion and a heat-melting portion, the insulating portion insulatingly isolating the pole hole and the pole circumferentially, the heat-melting portion being disposed on the inner side of the cover body, and the heat-melting portion being heat-melted and connected to the main body portion.

[0020] Optionally, one side of the tab connecting portion facing the battery cell has a first surface, one side of the pole connecting portion facing the battery cell has a second surface, and one side of the isolating portion facing the battery cell has an abutting surface. The first surface is flush with the abutting surface, the first surface is parallel to the second surface, and the second surface is disposed farther from the battery cell than the first surface.

[0021] The battery according to the embodiment of the second aspect of the present application includes the battery cell according to the embodiment of the first aspect of the present application.

[0022] The electrical device according to the embodiment of the third aspect of the present application includes the battery according to the embodiment of the second aspect of the present application.

[0023] Compared with the prior art, the present solution has the following beneficial effects:

[0024] The first insulating member of the battery cell according to the embodiment of the present application includes an isolating portion. After the pole connecting portion is connected to the pole and the tab connecting portion is connected to the tab, since the isolating portion can abut against the tab, it can avoid the pole connecting portion from overlapping with the tab or the pole from overlapping with the tab, and can ensure that the fusing portion effectively fuses when the current is overloaded, having better safety performance.

[0025] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of the battery cell provided by the embodiment of the present application;

[0028] Figure 2 It is a schematic diagram of the connection between the top cover assembly and the electrode assembly of the battery cell provided by the embodiment of the present application;

[0029] Figure 3 It is a schematic structural diagram of the top cover assembly of the battery cell provided by the embodiment of the present application;

[0030] Figure 4 is Figure 3 the sectional view taken along A-A of

[0031] Figure 5 is Figure 3 the sectional view taken along B-B of

[0032] Figure 6 is a partially enlarged view of the top cover assembly of the battery cell provided by the embodiment of the present application;

[0033] Figure 7 is a schematic structural view of the top cover assembly of the first form of the battery cell provided by the embodiment of the present application;

[0034] Figure 8 is a schematic structural view of the top cover assembly of the second form of the battery cell provided by the embodiment of the present application;

[0035] Figure 9 is a schematic structural view of the top cover assembly of the third form of the battery cell provided by the embodiment of the present application.

[0036] Icons: 100 - battery cell; 110 - top cover assembly; 111 - cover body; 1111 - pole hole; 112 - pole; 113 - first insulating member; 1131 - main body part; 1132 - isolation part; 1133 - first opening; 1134 - second opening; 1135 - abutting section; 1136 - connecting section; 1137 - hot melt hole; 1138 - abutting surface; 114 - second insulating member; 1141 - insulating part; 1142 - hot melt part; 120 - battery core; 121 - main body of the electrode assembly; 122 - tab; 130 - adapter; 131 - tab connection part; 132 - pole connection part; 133 - fusing part; 134 - first surface; 135 - second surface; 140 - housing. Detailed Embodiments

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application described and illustrated herein usually can be arranged and designed in various different configurations.

[0038] Therefore, the detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0039] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the battery cell 100 of the embodiment of the present application includes a top cover assembly 110, a battery core 120, and an adapter 130. The top cover assembly 110 includes a cover body 111, a pole column 112, and a first insulating member 113. The cover body 111 is provided with a pole column hole 1111, and the pole column 112 is disposed in the pole column hole 1111; an electrode tab 122 is provided on one side of the battery core 120 facing the cover body 111; the adapter 130 includes an electrode tab connection portion 131, a pole column connection portion 132, and a fusing portion 133. The fusing portion 133 is disposed between the electrode tab connection portion 131 and the pole column connection portion 132. The electrode tab connection portion 131 is electrically connected to the electrode tab 122, and the pole column connection portion 132 is electrically connected to the pole column 112. Wherein, the first insulating member 113 includes a main body portion 1131 and an isolation portion 1132. Along the thickness direction of the cover body 111, the main body portion 1131 insulates and isolates the cover body 111 from the battery core 120, and the isolation portion 1132 is used to abut against the electrode tab 122 to prevent the pole column connection portion 132 from overlapping with the electrode tab 122, or to prevent the pole column 112 from overlapping with the electrode tab 122.

[0040] The cover body 111 has a square structure. The length direction of the cover body 111 extends along the first direction X, the width direction extends along the second direction Y, and the thickness direction extends along the third direction Z; in other embodiments, the cover body 111 may also be a circular structure or an oval structure.

[0041] The first insulating member 113 is a lower plastic. The main body portion 1131 and the isolation portion 1132 may be integrally formed by an injection molding process, or may be connected together by an assembly method; the isolation portion 1132 may protrude from the surface of the main body portion 1131 facing the battery core 120, or may be flush with the surface of the main body portion 1131 facing the battery core 120; one or more isolation portions 1132 may be provided; the isolation portion 1132 may be disposed close to the pole column 112 to mainly insulate and isolate the pole column connection portion 132 from the electrode tab 122, or the isolation portion 1132 may be disposed for the electrode tab 122 and abut against the electrode tab 122 substantially evenly.

[0042] The first insulating member 113 of the battery cell 100 of the embodiment of the present application includes an isolation portion 1132. After the pole column connection portion 132 is connected to the pole column 112 and the electrode tab connection portion 131 is connected to the electrode tab 122, since the isolation portion 1132 can abut against the electrode tab 122, it can prevent the pole column connection portion 132 from overlapping with the electrode tab 122, or prevent the pole column 112 from overlapping with the electrode tab 122, and can ensure the effective fusing of the fusing portion 133 when the current is overloaded, having better safety performance.

[0043] The battery cell 100 further includes a housing 140 having an opening, and a cover 111 is used to close the opening. The battery core 120 is located inside the housing 140. The battery core 120 includes an electrode assembly main body 121 and a tab 122, and the tab 122 is located on a side of the electrode assembly main body 121 close to the cover 111.

[0044] In some embodiments of the present application, there are two tabs 122, namely a positive tab and a negative tab, and the two tabs 122 are arranged at intervals along the first direction X; correspondingly, there are also two adapter members 130 and two terminal posts 112. Each tab 122 is electrically connected to the corresponding terminal post 112 through the corresponding adapter member 130. The cover 111 is provided with two terminal post holes 1111, and the terminal posts 112 correspond to the terminal post holes 1111 one by one; in other embodiments, the cover 111 may also be provided with only one terminal post hole 1111, and only one terminal post 112 is arranged on the cover 111.

[0045] For the convenience of description, one set of the terminal posts 112, the terminal post holes 1111, the adapter members 130 and the tabs 122 is used to illustrate the present solution in this embodiment.

[0046] As Figure 2 and Figure 7 shown, in some embodiments of the present application, the main body portion 1131 is provided with a first opening 1133, the first opening 1133 is correspondingly arranged with the terminal post 112, the isolation portion 1132 is arranged close to the first opening 1133 and extends circumferentially around the first opening 1133.

[0047] The first opening 1133 penetrates through the cover 111 along the third direction Z, the terminal post 112 passes through the first opening 1133, the terminal post 112 provides electric energy outside the cover 111, and the terminal post 112 is welded to the terminal post connection portion 132 of the adapter member 130 on the inner side of the cover 111.

[0048] The isolation portion 1132 may be a structure continuously extending around the first opening 1133, or multiple isolation portions 1132 may be provided, and the multiple isolation portions 1132 are arranged at intervals around the first opening 1133.

[0049] Through this setting form, the isolation portion 1132 can reliably abut against the portion of the tab 122 corresponding to the first opening 1133, avoiding the tab 122 from overlapping with the terminal post 112 or the terminal post connection portion 132.

[0050] In other embodiments, the isolation portion 1132 may also be arranged at other positions of the main body portion 1131.

[0051] As Figure 7As shown, in some embodiments of the present application, along the width direction of the cover body 111, the isolation portion 1132 is arranged on one side of the first opening 1133, the pole ear 122 extends from one side of the cover body 111 to the lower side of the pole ear connecting portion 131, and the isolation portion 1132 is arranged on the same side as the pole ear 122.

[0052] The lower side of the tab connection portion 131 refers to the side of the tab connection portion 131 that is away from the cover 111. The tab 122 extends from one side of the second direction Y to the lower side of the tab connection portion 131, and is bent after being welded.

[0053] With this arrangement, the isolating portion 1132 can abut against the pole lug 122 , thereby reliably preventing the pole lug 122 from overlapping the pole connecting portion 132 or the pole 112 .

[0054] In other embodiments, the tab 122 may also extend into the lower side of the tab connecting portion 131 from other directions.

[0055] like Figure 8 As shown, in some other embodiments of the present application, two isolating portions 1132 are provided, and along the width direction of the cover body 111, i.e., the second direction Y, the two isolating portions 1132 are relatively arranged on both sides of the first opening 1133, and at least a portion of the pole connecting portion 132 is exposed between the two isolating portions 1132 to facilitate welding connection between the poles 112 and the pole connecting portions 132, and the pole lug 122 extends from at least one side of the cover body 111 to the lower side of the pole lug connecting portion 131.

[0056] Specifically, the tab welding portion of the tab 122 forms two branches, and the two branches extend from both sides along the second direction Y to the lower side of the tab connecting portion 131 , and each isolation portion 1132 abuts against one branch on the same side.

[0057] This arrangement is suitable for a structure in which the pole lug 122 extends from both sides to the pole lug connection portion 131 to be welded to the adapter 130 , so as to better prevent the pole lug 122 from abutting against the pole connection portion 132 or the pole 112 .

[0058] In other embodiments, the tab 122 may also only extend from one side of the cover 111 to the lower side of the tab connecting portion 131 .

[0059] like Figure 9As shown, in some other embodiments of the present application, an installation gap is formed between the isolation part 1132 and the main body part 1131. The isolation part 1132 is provided with a second opening 1134 corresponding to the first opening 1133. The pole connection part 132 is inserted into the installation gap, and at least part of the pole connection part 132 is exposed by the second opening 1134, so as to facilitate the welding connection between the pole 112 and the pole connection part 132. The pole ear 122 extends from at least one side of the cover body 111 to the lower side of the pole ear connection part 131.

[0060] Specifically, the pole ear welding part of the pole ear 122 forms two branches, and the two branches extend from both sides along the second direction Y to the lower side of the pole ear connection part 131. The pole connection part 132 is inserted into the installation gap, and the isolation part 1132 abuts against the pole ear 122.

[0061] Through this setting form, the position of the auxiliary fixing adapter 130 can be realized, and it is convenient for the welding connection between the pole connection part 132 and the pole 112.

[0062] In other embodiments, the pole ear 122 may also extend only from one side of the cover body 111 to the lower side of the pole ear connection part 131.

[0063] Such as Figure 5 As shown, in some embodiments of the present application, the isolation part 1132 includes an abutting section 1135 and a connecting section 1136. The abutting section 1135 is used to abut against the pole ear 122. The connecting section 1136 connects the main body part 1131 and the abutting section 1135. The connecting section 1136 is arranged close to the first opening 1133, and the abutting section 1135 extends from the connecting section 1136 into the interior of the first opening 1133.

[0064] Through this setting form, it can reliably avoid the overlap between the pole ear 122 and the pole connection part 132 or the pole 112.

[0065] In other embodiments, the isolation part 1132 may also only include the abutting section 1135, and the abutting section 1135 may also protrude from the main body part 1131 along the third direction Z.

[0066] Such as Figure 5 As shown, in some embodiments of the present application, the connecting section 1136 extends obliquely away from the main body part 1131, and the surface of the abutting section 1135 close to the pole ear 122 protrudes from the main body part 1131.

[0067] Through this setting form, a high isolation space can be provided in the third direction Z, and the overlap between the pole ear 122 and the pole connection part 132 or the pole 112 can be reliably avoided.

[0068] Further, the abutting section 1135 is arranged in parallel with the main body section 1131, and the included angle between the connecting section 1136 and the abutting section 1135 is α, where 95° ≤ α ≤ 160°.

[0069] With this setting form, not only can the reliable connection between the connecting section 1136 and the abutting section 1135 be achieved, making it not easy to break, but also there can be a sufficient abutting area with the tab 122, reliably avoiding the overlap between the tab 122 and the pole connection part 132 or the pole 112.

[0070] In some other embodiments of the present application, the connecting section 1136 extends towards the center of the first opening 1133, and the surface of the abutting section 1135 close to the tab 122 is flush with the main body section 1131.

[0071] The surface of the connecting section 1136 close to the tab 122 and the surface of the abutting section 1135 close to the tab 122 can be flush, or the surface of the connecting section 1136 close to the tab 122 can be concave with respect to the surface of the abutting section 1135; the connecting section 1136 can extend along the radial direction of the first opening 1133, or can point towards the inside of the first opening 1133 at an angle to the radial direction.

[0072] With this setting form, the space occupied by the isolation part 1132 in the third direction Z can be reduced, making the structure of the battery cell 100 compact.

[0073] In some embodiments of the present application, in the thickness direction of the cover 111, the projections of the isolation part 1132 and the pole connection part 132 do not overlap.

[0074] That is to say, in the XY plane, the projections of the isolation part 1132 and the pole connection part 132 do not overlap.

[0075] With this setting form, the overlap between the tab 122 and the pole connection part 132 can be reliably avoided, and the assembly process of the adapter 130 can be simplified. The pole connection part 132 can be attached to the pole 112 along the third direction Z without positional interference with the isolation part 1132.

[0076] In some other embodiments of the present application, in the thickness direction of the cover 111, the projections of the isolation part 1132 and the pole connection part 132 partially overlap.

[0077] That is to say, in the XY plane, the projections of the isolation part 1132 and the pole connection part 132 partially overlap.

[0078] As a preferred example form, the projected area formed by the isolation part 1132 in the XY plane is S1, and the projected area of the pole 112 in the XY plane is S2, where S1 ≥ 10% S2, ensuring that the isolation part 1132 can effectively insulate and isolate the tab 122.

[0079] With this arrangement, reliable avoidance of the overlap between the tab 122 and the terminal post 112 can be achieved. The presence of the isolation portion 1132 does not affect the area of the terminal post connection portion 132, thus allowing a relatively large contact area between the terminal post connection portion 132 and the terminal post 112. As a result, a relatively large welding area is obtained, improving the current-carrying capacity at the connection between the adapter 130 and the terminal post 112.

[0080] Furthermore, a weld mark is formed at the welding joint between the terminal post 112 and the terminal post connection portion 132. Along the thickness direction of the cover body 111, the projection of the isolation portion 1132 does not coincide with that of the weld mark.

[0081] That is to say, in the XY plane, the projection of the isolation portion 1132 does not coincide with that of the weld mark.

[0082] With this arrangement, smooth welding between the terminal post 112 and the terminal post connection portion 132 can be allowed, providing sufficient welding space for the welding head, and enabling smooth assembly of the first insulating member 113 and the adapter 130.

[0083] As Figure 6 shown, in some embodiments of the present application, along the length direction of the cover body 111, the length of the isolation portion 1132 is L, and along the width direction of the cover body 111, the width of the isolation portion 1132 is W, satisfying:

[0084] 10mm ≤ L ≤ 30mm, 3mm ≤ W ≤ 10mm.

[0085] With this arrangement, the isolation portion 1132 can effectively abut against the tab 122 without overly occupying the internal space of the housing 140.

[0086] As Figure 4 and Figure 6 shown, in some embodiments of the present application, the top cover assembly 110 further includes a second insulating member 114. The second insulating member 114 includes an insulating portion 1141 and a heat-melting portion 1142. The insulating portion 1141 circumferentially insulates the terminal post hole 1111 and the terminal post 112, and the heat-melting portion 1142 is disposed on the inner side of the cover body 111 and is heat-melted and connected to the main body portion 1131.

[0087] The main body portion 1131 has a heat-melting hole 1137 corresponding to the heat-melting portion 1142. The heat-melting portion 1142 extends into the heat-melting hole 1137 and undergoes a heat-melting reaction at high temperature to realize the connection between the first insulating member 113 and the second insulating member 114.

[0088] With this arrangement, reliable connection between the first insulating member 113 and the second insulating member 114 can be achieved.

[0089] In other embodiments, the first insulating member 113 and the second insulating member 114 can also be connected by other means.

[0090] As Figure 4 shown, in some embodiments of the present application, one side of the tab connecting portion 131 facing the battery cell 120 has a first surface 134, one side of the terminal connecting portion 132 facing the battery cell 120 has a second surface 135, and one side of the isolating portion 1132 facing the battery cell 120 has an abutting surface 1138. The first surface 134 is flush with the abutting surface 1138, the first surface 134 is parallel to the second surface 135, and the second surface 135 is arranged farther away from the battery cell 120 than the first surface 134.

[0091] The adapter 130 has a Z-shaped structure. The tab connecting portion 131 and the terminal connecting portion 132 are parallel to each other. The thickness directions of the tab connecting portion 131 and the terminal connecting portion 132 both extend along the third direction Z. One end of the fusing portion 133 is connected to the tab connecting portion 131, and the other end extends obliquely toward the cover 111 until it is connected to the terminal connecting portion 132. The first surface 134 is arranged farther away from the cover 111 than the second surface 135 in the third direction Z.

[0092] In the third direction Z, the surface of the tab connecting portion 131 facing the battery cell 120 is flush with the isolating portion 1132, that is, the first surface 134 is flush with the abutting surface 1138.

[0093] Through this setting form, the isolating portion 1132 is reliably abutted against the tab 122, reducing the possibility of the tab 122 being bent and broken.

[0094] The cross-sectional area of the fusing portion 133 is S3, and the cross-sectional area of the remaining part of the adapter 130 along the first direction X is S4, and S4 = (1.5 - 2)S3, so as to ensure both the structural strength of the adapter 130 and effective fusing when the current is too large.

[0095] The battery cell 100 of the embodiment of the present application is provided with an isolating portion 1132, and the isolating portion 1132 abuts against the tab 122, so as to avoid the terminal connecting portion 132 from overlapping with the tab 122, or avoid the terminal 112 from overlapping with the tab 122, and ensure the effective fusing of the fusing portion 133 when the current is overloaded, having better safety performance.

[0096] A battery according to some embodiments of the present application includes a battery cell 100.

[0097] An electrical device including a battery according to some embodiments of the present application.

[0098] Due to the characteristics of the battery cell 100 in the embodiments of the present application, the batteries and electrical devices in the embodiments of the present application all have good safety performance.

[0099] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0100] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell (100), characterized in that, Comprising: A top cover assembly (110), including a cover body (111), a pole column (112), and a first insulating member (113). The cover body (111) is provided with a pole column hole (1111), and the pole column (112) is arranged in the pole column hole (1111); An electric core (120), and an electrode tab (122) is provided on a side of the electric core (120) facing the cover body (111); An adapter (130), including an electrode tab connection portion (131), a pole column connection portion (132), and a fusing portion (133). The fusing portion (133) is arranged between the electrode tab connection portion (131) and the pole column connection portion (132). The electrode tab connection portion (131) is electrically connected to the electrode tab (122), and the pole column connection portion (132) is electrically connected to the pole column (112); Wherein, the first insulating member (113) includes a main body portion (1131) and an isolation portion (1132). Along the thickness direction of the cover body (111), the main body portion (1131) insulates and isolates the cover body (111) from the electric core (120), and the isolation portion (1132) is used to abut against the electrode tab (122) to prevent the pole column connection portion (132) from overlapping with the electrode tab (122), or to prevent the pole column (112) from overlapping with the electrode tab (122).

2. The battery cell (100) according to claim 1, wherein, The main body portion (1131) is provided with a first opening (1133), and the first opening (1133) is arranged corresponding to the pole column (112). The isolation portion (1132) is arranged close to the first opening (1133) and extends circumferentially around the first opening (1133).

3. The battery cell (100) according to claim 2, wherein, Along the width direction of the cover body (111), the isolation portion (1132) is arranged on one side of the first opening (1133). The electrode tab (122) extends from one side of the cover body (111) to the lower side of the electrode tab connection portion (131), and the isolation portion (1132) is arranged on the same side as the electrode tab (122).

4. The battery cell (100) according to claim 2, wherein, There are two isolation portions (1132). Along the width direction of the cover body (111), the two isolation portions (1132) are oppositely arranged on both sides of the first opening (1133). At least part of the pole column connection portion (132) is exposed between the two isolation portions (1132) to facilitate the welding connection between the pole column (112) and the pole column connection portion (132). The electrode tab (122) extends from at least one side of the cover body (111) to the lower side of the electrode tab connection portion (131).

5. The battery cell (100) according to claim 2, characterized in that, An installation gap is formed between the isolation part (1132) and the main body part (1131). The isolation part (1132) is provided with a second opening (1134) corresponding to the first opening (1133). The pole connection part (132) is inserted into the installation gap, and at least part of the pole connection part (132) is exposed by the second opening (1134) so as to facilitate the welding connection between the pole (112) and the pole connection part (132). The tab (122) extends from at least one side of the cover body (111) to the lower side of the tab connection part (131).

6. The battery cell (100) according to claim 2, wherein The isolation part (1132) includes an abutting section (1135) and a connecting section (1136). The abutting section (1135) is used for abutting against the tab (122), and the connecting section (1136) connects the main body part (1131) and the abutting section (1135). The connecting section (1136) is arranged close to the first opening (1133), and the abutting section (1135) extends from the connecting section (1136) into the interior of the first opening (1133).

7. The battery cell (100) according to claim 6, characterized in that, The connecting section (1136) extends towards the center of the first opening (1133), and the surface of the abutting section (1135) close to the tab (122) is flush with the main body part (1131).

8. The battery cell (100) according to claim 6, characterized in that, The connecting section (1136) extends obliquely away from the main body part (1131), and the surface of the abutting section (1135) close to the tab (122) protrudes from the main body part (1131).

9. The battery cell (100) according to claim 8, wherein The abutting section (1135) is arranged parallel to the main body part (1131), and the included angle between the connecting section (1136) and the abutting section (1135) is α, where 95° ≤ α ≤ 160°.

10. The battery cell (100) according to claim 6, characterized in that, In the thickness direction of the cover body (111), the projections of the isolation part (1132) and the pole connection part (132) do not coincide.

11. The battery cell (100) according to claim 6, characterized in that, In the thickness direction of the cover body (111), the projections of the isolation part (1132) and the pole connection part (132) partially coincide.

12. The battery cell (100) according to claim 11, wherein, A welding mark is formed at the welding joint between the pole (112) and the pole connection part (132). In the thickness direction of the cover body (111), the projection of the isolation part (1132) and the welding mark do not coincide.

13. The battery cell (100) according to claim 6, characterized in that, Along the length direction of the cover body (111), the length of the isolation part (1132) is L, and along the width direction of the cover body (111), the width of the isolation part is W, satisfying: 10mm ≤ L ≤ 30mm, 3mm ≤ W ≤ 10mm.

14. The battery cell (100) according to claim 1, characterized in that, The top cover assembly (110) further includes: A second insulating part (114), including an insulating portion (1141) and a heat-melting portion (1142). The insulating portion (1141) insulates the pole hole (1111) and the pole (112) circumferentially, and the heat-melting portion (1142) is arranged on the inner side of the cover body (111), and the heat-melting portion (1142) is heat-melted and connected to the main body part (1131).

15. The battery cell (100) according to claim 1, characterized in that, One side of the tab connecting portion (131) facing the battery cell (120) has a first surface (134), one side of the terminal connecting portion (132) facing the battery cell (120) has a second surface (135), and one side of the isolation portion (1132) facing the battery cell (120) has an abutting surface (1138). The first surface (134) is flush with the abutting surface (1138), the first surface (134) is parallel to the second surface (135), and the second surface (135) is farther away from the battery cell (120) than the first surface (134).

16. A battery, characterized in that, It includes the battery cell (100) according to any one of claims 1-15.

17. An electrical device, characterized in that, It includes the battery according to claim 16.

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