Separator, battery cell, battery device and electric equipment

Abstract

The embodiment of the utility model provides a separator, a battery cell, a battery device and electric equipment, and relates to the technical field of battery preparation, the separator is used for isolating a tab and a shell of the battery cell, and the separator comprises a first limiting part and a second limiting part; wherein the first limiting part is provided with a first positioning hole, the first positioning hole penetrates through the first limiting part along the thickness direction of the first limiting part, and the first positioning hole is used for penetrating through a tab; and the first limiting part and the second limiting part are enclosed to form a first accommodating space for accommodating the tab. According to the embodiment of the invention, the first limiting part and the second limiting part are arranged, and the first limiting part and the second limiting part are enclosed, so that the separator can form the first accommodating space for accommodating the tab; wherein the bottom of the separator can limit the root part of the tab, and the side surface of the separator can limit the displacement of the bent part of the tab along the second direction, so that the tab can be effectively isolated in the first accommodating space, the short circuit of the battery caused by the contact between the tab and the battery cell shell is prevented, and the safety of the battery cell is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to an isolating element, a battery cell, a battery device and an electrical equipment. Background Art

[0002] The battery cell generally includes a shell, a cover assembly and a core assembly, wherein the core assembly includes a tab, which is usually bent in an assembled cell. During the production, transportation and use of the battery, the tab may be shaken to cause the tab to contact the shell and cause a short circuit in the battery, so an isolation device is generally provided between the core assembly and the shell.

[0003] In the prior art, after the tab and the cover plate assembly are welded and bent, an isolation piece is generally provided to isolate the tab from the shell; however, since the bending shape of the tab is unstable, the tab is easily squeezed and overflows from the isolation piece when the bending shape changes, and contacts the shell, causing a short circuit in the battery. Utility Model Content

[0004] The present application aims to provide an isolating element and a battery cell to solve the problem that the existing isolating element cannot effectively isolate the tabs, resulting in the tabs contacting the shell and causing a battery short circuit.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses an isolating member for isolating a tab and a shell of a battery cell, wherein the isolating member comprises a first limiting portion and a second limiting portion; wherein:

[0007] The first limiting portion is provided with a first positioning hole, which penetrates the first limiting portion along the thickness direction of the first limiting portion, and is used to pass the pole lug; the first limiting portion and the second limiting portion enclose a first accommodating space for accommodating the pole lug.

[0008] Optionally, the first limiting portion includes a first side and a second side arranged opposite to each other along a second direction, the number of the second limiting portions is two, the two second limiting portions extend along the thickness direction of the first limiting portion and are respectively connected to the first side and the second side of the first limiting portion; the second direction forms a preset angle with the thickness direction.

[0009] Optionally, the isolating member further includes a bending portion connected between the first limiting portion and the second limiting portion, and the second limiting portion is bendably connected to the first limiting portion through the bending portion.

[0010] Optionally, the thickness of the first limiting portion is a first thickness, the thickness of the second limiting portion is a second thickness, and the thickness of the bending portion is a third thickness; the third thickness is smaller than the first thickness and / or the second thickness.

[0011] Optionally, the first thickness and the second thickness are both 0.5 mm to 1.2 mm, and the third thickness is 40% to 60% of the first thickness.

[0012] Optionally, the first limiting portion, the two second limiting portions and the bending portion are an integrally formed structure.

[0013] Optionally, a first clamping portion is provided on a side of the second limiting portion away from the first limiting portion, and the first clamping portion is used to cooperate with and connect to a cover plate assembly of the battery cell.

[0014] Optionally, the isolation member also includes a first fixing portion, the first limiting portion also includes a third side along the first direction, and the first fixing portion is connected to the third side of the first limiting portion; the first fixing portion is used to abut against the cover plate assembly of the battery cell, and the first direction is perpendicular to the thickness direction.

[0015] Optionally, the first fixing portion is provided with a second positioning hole extending along the first direction, and the first positioning hole is connected to the second positioning hole.

[0016] Optionally, the width of the first positioning hole along the second direction is a first width, and the width of the second positioning hole along the second direction is a second width; wherein the second width is greater than the first width; and the second direction is perpendicular to the first direction.

[0017] Optionally, the first width is 1 mm to 5 mm, and the second width is 0.8 mm to 2 mm.

[0018] Optionally, the first limiting portion and the second limiting portion are arranged at a preset angle α, and the preset angle α satisfies: 80°≤α≤90°.

[0019] Optionally, the isolation member also includes a second fixing portion, the first limiting portion also includes a fourth side arranged opposite to the third side along the first direction, and the second fixing portion is connected to the fourth side of the first limiting portion; the second fixing portion is used to abut against the cover plate assembly of the battery cell.

[0020] In a second aspect, the present application further discloses a battery cell, the battery cell comprising: a housing, a cover plate assembly, a pole core assembly, and the separator as described above; wherein:

[0021] A second accommodating space having an opening is provided in the shell;

[0022] The pole core assembly is arranged in the second accommodation space, and the pole core assembly includes a pole core and a pole ear connected to the pole core, and the pole ear is close to the opening side;

[0023] The cover plate assembly is connected to the opening side of the housing;

[0024] The isolating member is arranged between the cover plate assembly, the pole core and the shell, the pole ear extends from the first positioning hole of the isolating member to the first accommodating space of the isolating member, the second limiting portion of the isolating member extends toward the opening, and the first limiting portion of the isolating member abuts against the pole core.

[0025] Optionally, the cover plate assembly includes a cover plate and a cover plate isolator, the cover plate isolator is connected to the side of the cover plate close to the pole core assembly, and the cover plate isolator is also provided with a second clamping portion; the second limiting portion of the isolator is provided with a first clamping portion on the side away from the first limiting portion of the isolator, and the second clamping portion is clamped and cooperated with the first clamping portion to fix the isolator to the cover plate assembly.

[0026] Optionally, a first protrusion and a second protrusion are further provided on one side of the cover plate isolation member close to the pole core assembly, and the isolation member further includes a first fixing portion and a second fixing portion, and the first protrusion and the second protrusion are respectively used to press and fix the first fixing portion and the second fixing portion.

[0027] In a third aspect, the present application further discloses a battery device, comprising a battery case and the battery cell as described above, wherein the battery cell is accommodated in the battery case.

[0028] In a fourth aspect, the present application further discloses an electrical device, comprising the battery cell or battery device as described above.

[0029] In an embodiment of the present application, by providing a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion can enclose the isolating member to form a first accommodating space for accommodating the pole ear; wherein, the bottom of the isolating member can limit the root of the pole ear, and the side surface can limit the displacement of the bent portion of the pole ear along the second direction, thereby effectively isolating the pole ear in the first accommodating space, preventing the pole ear from contacting the battery cell shell and causing a battery short circuit, thereby improving the safety of the battery cell.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 is a schematic diagram of the structure of the isolation element described in the embodiment of the present application;

[0033] Figure 2 It is one of the schematic diagrams of the assembly of the isolation member described in the embodiment of the present application;

[0034] Figure 3 yes Figure 2 A magnified schematic diagram of the middle part;

[0035] Figure 4 This is the second schematic diagram of the isolation member assembly described in the embodiment of the present application;

[0036] Figure 5 yes Figure 4 The enlarged schematic diagram of the middle B part;

[0037] Figure 6 It is a schematic diagram of the assembly of the pole core assembly and the shell according to the embodiment of the present application;

[0038] Figure 7 is a cross-sectional view of a battery cell according to an embodiment of the present application;

[0039] Figure 8 yes Figure 7 Enlarged schematic diagram of part C in the middle.

[0040] Figure numerals: 100 - isolating member; 10 - first limiting portion; 11 - first positioning hole; 111 - first opening; 20 - second limiting portion; 21 - first clamping portion; 30 - bending portion; 40 - first fixing portion; 41 - second positioning hole; 411 - second opening; 50 - second fixing portion; 200 - shell; 300 - cover plate assembly; 301 - cover plate; 302 - second clamping portion; 303 - first protruding portion; 304 - second protruding portion; 305 - cover plate isolating member; 306 - cover plate lead-out piece; 400 - pole core assembly; 401 - pole core; 402 - pole ear; 4021 - pole ear bending portion; 4022 - pole ear root. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0042] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The embodiment of the present application provides an isolation member 100, which can be used to isolate the tabs and shell of the battery cell in the battery cell. The isolation member 100 has a first accommodating space, and the first accommodating space can limit the tabs to prevent the tabs from contacting the shell and causing a battery short circuit. The isolation member 100 provided in the embodiment of the present application can be used for battery cells of various specifications and models, and the embodiment of the present application does not limit the specific type of the battery cell.

[0046] It should be noted that, in the embodiments of the present application, Figures 1 to 8 The first direction is the direction indicated by arrow x, the second direction is the direction indicated by arrow y, and the third direction is the direction indicated by arrow z. The first direction, the second direction, and the third direction are perpendicular to each other.

[0047] Reference Figure 1 , shows a schematic diagram of the structure of the isolation element 100 according to an embodiment of the present application. Figure 1As shown, the isolation member 100 may specifically include a first limiting portion 10 and a second limiting portion 20; wherein the first limiting portion 10 is provided with a first positioning hole 11, the first positioning hole 11 penetrates the first limiting portion 10 along the thickness direction of the first limiting portion 10, and the first positioning hole 11 is used to pass through the pole ear 402; the first limiting portion 10 and the second limiting portion 20 are enclosed to form a first accommodating space for accommodating the pole ear 402.

[0048] In the embodiment of the present application, the isolating member 100 includes a first limiting portion 10. Specifically, the first limiting portion 10 is a flat sheet structure made of an insulating material, and the first positioning hole 11 is a through hole that penetrates the first limiting portion 10 along the thickness direction of the first limiting portion 10. In practical applications, the first positioning hole 11 is used to pass through the pole lug 402, and after the pole lug 402 passes through the first positioning hole 11, the first limiting portion 10 is used to abut against the pole lug root 4022 to limit the displacement of the pole lug root 4022 along the third direction z.

[0049] It should be noted that the embodiment of the present application does not specifically limit the shape and extension direction of the first positioning hole 11, and in practical applications, it can be sufficient for the tab to pass through; preferably, the first positioning hole 11 can be a strip hole adapted to the shape of the tab, and the first positioning hole 11 can extend along the first direction x. In practical applications, the length of the first positioning hole 11 along the first direction x is greater than the size of the cell tab 402 along the first direction x, so that the first positioning hole 11 can easily pass through the cell tab 402, and the first limiting portion 10 abuts against the tab root 4022, which can also enhance the bending effect of the tab 402.

[0050] Optionally, along the second direction y, the position of the first positioning hole 11 can be set in the middle of the first limiting portion 10. It can be understood that when this is set, the structure of the first limiting portion 10 is more symmetrical. When the pole ear 402 passes through the first positioning hole 11 and the first limiting portion 10 abuts against the pole ear root 4022, the limiting of the two sides of the pole ear root 4022 along the second direction y is also more uniform and reliable; along the first direction x, the first positioning hole 11 can be provided with an opening or not; it can be understood that when the first positioning hole 11 is provided with an opening, the first positioning hole 11 of the isolating member 100 can pass through the side of the pole ear 402, and when the first positioning hole 11 is not provided with an opening, the first positioning hole 11 of the isolating member 100 can pass through the upper part of the pole ear 402. In practical applications, it can be set according to actual production conditions.

[0051] In the embodiment of the present application, the isolating member 100 further includes a second limiting portion 20 , wherein the second limiting portion 20 and the first limiting portion 10 enclose a first accommodating space. In practical applications, the first accommodating space can be used to accommodate the tab 402 .

[0052] Specifically, the second limiting portion 20 is also a flat sheet structure made of insulating material, and is arranged at a preset angle with the first limiting portion 10; further, the angle between the first limiting portion 10 and the second limiting portion 20 can be an acute angle to better adapt to the shape of the bent pole ear root 4022, and the length of the second limiting portion 20 along the first direction x is the same as that of the first limiting portion 10, so as to limit the pole ear 402 in the first accommodation space along the first direction x. In practical applications, the second limiting portion 20 can limit the movement of the pole ear 402 along the second direction y, thereby preventing the side of the pole ear 402 from contacting the battery cell housing 200 and causing a battery short circuit.

[0053] In the embodiment of the present application, the first limiting portion 10 includes a first side and a second side arranged relatively along the second direction y, and the number of the second limiting portions 20 is two. The two second limiting portions 20 extend along the thickness direction of the first limiting portion 10 and are respectively connected to the first side and the second side of the first limiting portion 10, wherein the thickness direction of the first limiting portion can be any direction between the second direction y and the third direction z, thereby, the second direction forms a preset angle with the thickness direction of the first limiting portion.

[0054] Specifically, the two second limiting portions 20 may extend along the thickness direction of the first limiting portion 10. Optionally, when the thickness direction of the first limiting portion 10 is consistent with the third direction z, the second limiting portion 20 is perpendicular to the first limiting portion 10. When the thickness direction of the first limiting portion 10 is any direction between the second direction y and the third direction z, the second limiting portion 20 may extend along the thickness direction inclined to the first limiting portion 10. In practical applications, when assembling the isolating member 100, the first positioning hole 11 of the isolating member 100 may be passed through the pole ear 402 so that the first limiting portion 10 abuts against the pole ear root 4022, and then the second limiting portion 20 is bent toward the first limiting portion 10. After the two second limiting portions 20 are bent, the first limiting portion 10 and the two second limiting portions 20 may be enclosed to form a first accommodation space, and the first accommodation space may be used to accommodate the pole ear 402. In practical applications, the first limiting portion 10 and the second limiting portion 20 may also be configured as a planar structure. In the production of the isolation element 100, such a planar structure is more convenient for the storage and transportation of components.

[0055] In other embodiments, the second limiting portion 20 can be an annular structure with openings at both ends. The first limiting portion 10 closes an opening of the groove structure to form a first accommodating space. The pole ear 402 passes through the first positioning hole 11 of the first limiting portion 10 and is accommodated in the first accommodating space. The pole ear 402 is then electrically connected to the pole of the cover plate assembly to lead out the electrode. In this way, the pole ear 402 is surrounded by the second limiting portion 20, so that the sides of the pole ear 402 cannot contact the battery cell shell 200 to cause a battery short circuit.

[0056] In the embodiment of the present application, the isolating member 100 further includes a bending portion 30 connected between the first limiting portion 10 and the second limiting portion 20 , and the second limiting portion 20 is bendably connected to the first limiting portion 10 via the bending portion 30 .

[0057] In practical applications, the provision of the bending portion 30 makes it easier to perform a bending operation on the second limiting portion 20 , which is beneficial to improving the assembly efficiency of the isolation member 100 .

[0058] In the embodiment of the present application, the first limiting portion 10, the two second limiting portions 20 and the bending portion 30 are an integrally formed structure.

[0059] Specifically, the first limiting portion 10, the two second limiting portions 20 and the bending portion 30 are planar structures made of insulating materials. During the assembly process of the spacer 100, the two second limiting portions 20 are bent toward the first limiting portion 10 to form a first accommodation space for accommodating the battery cell tab 402. In practical applications, the first limiting portion 10, the two second limiting portions 20 and the bending portion 30 are set as an integrated structure. It can be understood that the integrated structure strengthens the structural integrity of the spacer 100 and reduces the probability of damage to the spacer 100 during the use of the battery. In addition, the integrated structure is also conducive to reducing the difficulty of production.

[0060] It should be noted that the first limiting portion 10 and the two second limiting portions 20 may also be provided as a split structure, and the first limiting portion 10 and the second limiting portion 20 are connected via a rotating connecting member to form the isolation member 100 .

[0061] In the embodiment of the present application, the thickness of the first limiting portion 10 is the first thickness, the thickness of the second limiting portion 20 is the second thickness, and the thickness of the bending portion 30 is the third thickness; the third thickness is less than the first thickness and the second thickness.

[0062] Specifically, when the first limiting portion 10, the two second limiting portions 20 and the bending portion 30 are set as an integrally formed structure, the thickness of the bending portion 30 is set to be smaller than the thickness of the first limiting portion 10 and the second limiting portion 20, so that the bending of the second limiting portion 20 can be easier, which is beneficial to improving the assembly efficiency of the isolation member 100.

[0063] Optionally, the first thickness and the second thickness can be set to 0.5 mm-1.2 mm, and the third thickness can be set to 40%-60% of the first thickness. In practical applications, the selection of the first thickness and the second thickness needs to meet the limiting requirements of the tab 402, wherein the third thickness is set to 40%-60% of the first thickness, while meeting the connection strength between the first limiting portion 10 and the second limiting portion 20, the bending efficiency of the second limiting portion 20 can be improved.

[0064] In the embodiment of the present application, a first clamping portion 21 is provided on a side of the second limiting portion 20 away from the first limiting portion 10 , and the first clamping portion 21 is used to cooperate with and connect to the cover plate assembly 300 of the battery cell.

[0065] Specifically, the first clamping portion 21 may be a clamping slot, and the second limiting portion 20 is provided with at least one clamping slot, and the number of the clamping slots should match the number of the battery cell upper cover buckles 302. Preferably, the first clamping portion 21 is provided in plurality, and when the first clamping portion 21 is provided in plurality, the first clamping portions 21 are evenly spaced on the second limiting portion 20 along the first direction x, thereby enhancing the connection effect between the second limiting member and the battery cell.

[0066] In the embodiment of the present application, the isolation member 100 further includes a first fixing portion 40, and the first limiting portion 10 further includes a third side along the first direction x. The first fixing portion 40 is connected to the third side of the first limiting portion 10 and is used to abut against the cover plate assembly 300 of the battery cell.

[0067] Specifically, the first fixing portion 40 and the first limiting portion 10 are an integrally formed structure, and the width of the first fixing portion 40 along the second direction y may be equal to the width of the first limiting portion 10 along the second direction y, or may be slightly smaller than the width of the first limiting portion 10 along the second direction y. In practical applications, after the separator 100 and the tab 402 are preliminarily positioned, the first fixing portion 40 may be bonded to the battery cell using an adhesive tape to achieve a preliminary fixation of the separator 100 and the battery cell, so as to facilitate subsequent welding and bending operations of the tab 402.

[0068] In the embodiment of the present application, the first fixing portion 40 is further provided with a second positioning hole 41 extending along the first direction x, and the first positioning hole 11 is connected to the second positioning hole 41 .

[0069] Specifically, the first positioning hole 11 is provided with a first opening 111 on the third side of the first limiting portion 10 , and the second positioning hole 41 is further provided with a second opening 411 on a side away from the first limiting portion 10 ; the first positioning hole 11 is connected to the second positioning hole 41 through the first opening 111 .

[0070] In practical applications, when the first positioning hole 11 is connected to the second positioning hole 41 , the isolating member 100 can pass through the tab 402 from the side, so as to enrich the assembly methods of the isolating member 100 and the tab 402 .

[0071] In the embodiment of the present application, the width of the first positioning hole 11 along the second direction y is the first width, and the width of the second positioning hole 41 along the second direction y is the second width; wherein the second width is greater than the first width. Specifically, the first width can be set in the range of 1mm-5mm, and the second width can be set in the range of 0.8mm-2mm.

[0072] It should be noted that when the second width is greater than the first width, the second positioning hole 41 of the isolating member 100 is more convenient to pass through the tab 402 , and plays a good guiding role in the second positioning hole 41 passing through the tab 402 , which is beneficial to further improve the assembly efficiency of the isolating member 100 .

[0073] In the embodiment of the present application, the first limiting portion 10 and the second limiting portion 20 are arranged at a preset angle α. In actual applications, the preset angle α can be set in the range of 80°-90°.

[0074] In actual applications, since the pole ear root 4022 will form an upward protrusion after clamping, the preset angle α between the first limiting portion 10 and the second limiting portion 20 is set at 80°-90°, which can make the first limiting portion 10 and the pole ear root 4022 fit more closely, thereby enhancing the abutment effect between the first limiting portion 10 and the pole ear root 4022.

[0075] In an embodiment of the present application, the isolation member 100 also includes a second fixing portion 50, the first limiting portion 10 also includes a fourth side arranged opposite to the third side along the first direction x, and the second fixing portion 50 is connected to the fourth side of the first limiting portion 10; the second fixing portion 50 is used to abut against the cover plate assembly of the battery cell.

[0076] Specifically, the first fixing portion 40, the second fixing portion 50 and the first limiting portion 10 are an integrally formed structure, and the width of the second fixing portion 50 along the second direction y can be equal to the width of the first limiting portion 10 along the second direction y, or can be slightly smaller than the width of the first limiting portion 10 along the second direction y. In practical applications, after the separator 100 and the tab 402 are preliminarily positioned, the first fixing portion 40 and the second fixing portion 50 can be bonded to the battery cell using tape to achieve the preliminarily fixing of the separator 100 and the battery cell, so as to facilitate the subsequent welding and bending operations of the tab 402.

[0077] The present application also provides a battery cell, referring to Figure 2 , shows one of the schematic diagrams of assembling the isolating element 100 according to the embodiment of the present application; Figure 3 , showing Figure 2 Enlarged schematic diagram of part A in the middle; refer to Figure 4 , shows the second schematic diagram of the assembly of the isolation member 100 according to the embodiment of the present application; Figure 5 , showing Figure 4 Enlarged diagram of part B in the middle; refer to Figure 6 , showing a schematic diagram of the assembly of the pole core assembly 400 and the housing 200 according to an embodiment of the present application; Figure 7 , showing a cross-sectional view of the battery cell described in an embodiment of the present application; referring to Figure 8 , showing Figure 7 Enlarged schematic diagram of part C in the middle.

[0078] like Figures 2 to 8 As shown, the battery cell may include: a housing 200, a cover plate assembly 300, a pole core assembly 400, and the separator 100 as described above.

[0079] Specifically, a second accommodating space with an opening is provided in the shell 200; the pole core assembly 400 is arranged in the second accommodating space, and the pole core assembly 400 includes a pole core 401 and a pole ear 402 connected to the pole core 401, and the pole ear 402 is close to the opening side; the cover plate assembly 300 is connected to the opening side of the shell 200, and the cover plate assembly 300 also includes a cover plate lead-out piece 306, and the cover plate lead-out piece 306 is used for welding with the pole ear 402; the isolating member 100 is arranged between the cover plate assembly 300, the pole core 401 and the shell 200, and the pole ear 402 extends from the first positioning hole 11 of the isolating member 100 to the first accommodating space of the isolating member 100, and is bent and arranged in the first accommodating space; the second limiting portion 20 of the isolating member 100 extends toward the opening, and the first limiting portion 10 of the isolating member 100 abuts against the pole core 401.

[0080] It should be noted that, since the separator 100 is disposed between the cap assembly 300, the pole core 401 and the housing 200, and the pole ear 402 is bent and disposed in the first accommodation space of the separator 100, the separator 100 can well isolate the pole ear bent portion 4021 from the battery housing 200. After the pole core assembly 400 is assembled in the housing 200, the second limiting portion 20 of the separator 100 extends toward the opening and is located on the side of the second accommodation space close to the opening, and the first limiting portion 10 of the separator 100 abuts against the pole core 401.

[0081] In an embodiment of the present application, the cover plate assembly 300 also includes a cover plate 301 and a cover plate isolating member 305, the cover plate isolating member 305 is connected to the side of the cover plate 301 close to the pole core assembly 400, and the cover plate isolating member 305 is also provided with a second clamping portion 302; the second limiting portion 20 of the isolating member 100 is provided with a first clamping portion 21 on the side away from the first limiting portion 10, and the second clamping portion 302 is used to clamp and cooperate with the first clamping portion 21 of the isolating member 100 to fix the isolating member 100 to the cover plate assembly 300.

[0082] Specifically, the second clip part 302 can be a clip, and there can be multiple clips. The multiple clips are evenly arranged along the first direction x at the positions where the cover isolation member 305 and the first clip part 21 of the isolation member 100 are adapted to each other. Through the clip-fitting cooperation between the first clip part 21 and the second clip part 302, the fixing effect of the isolation member 100 can be enhanced.

[0083] It should be noted that the first snap-fit ​​portion may be configured as a buckle, and the second snap-fit ​​portion may be configured as a slot, which can also satisfy the snap-fit ​​cooperation between the isolation member 100 and the cover assembly 300, and this application does not make any specific limitation.

[0084] In the embodiment of the present application, the cover plate isolation member 305 of the cover plate assembly 300 is further provided with a first protrusion 303 and a second protrusion 304 on one side close to the pole core assembly 400, and the isolation member 100 also includes a first fixing portion 40 and a second fixing portion 50. In actual application, the positions of the first protrusion 303 and the second protrusion 304 correspond to the first fixing portion 40 and the second fixing portion 50, respectively, and the first protrusion 303 and the second protrusion 304 are respectively used to press and fix the first fixing portion 40 and the second fixing portion 50, so that the first limiting portion 10 of the isolation member 100 can better abut against the pole ear root 4022, thereby effectively preventing the pole ear root 4022 from contacting the battery cell housing 200.

[0085] According to the separator 100 and the battery cell provided in the embodiment of the present application, when assembling the battery cell, as shown in FIG. Figures 2 to 3 As shown, firstly, the pole ear 402 of the pole core assembly 400 is clamped with a clamp, and then the second positioning hole 41 of the first fixing part 40 on the isolating member 100 is inserted from the side of the pole ear 402 along the first direction x until the pole ear 402 passes through the first positioning hole 11 on the first limiting part 10; after the pole ear 402 is at the designed position, the first fixing part 40 and the second fixing part 50 are fixed to the pole core 401 with tape to achieve the initial fixation of the isolating member 100, prevent the isolating member 100 from moving, and facilitate the subsequent welding and bending operations of the pole ear 402. Further, after the isolating member 100 is initially positioned and fixed, the pole ear 402 is laser welded to the cover plate lead-out piece 306.

[0086] like Figures 4 to 5As shown, after the electrode tab 402 and the cover plate lead-out piece 306 are welded, the electrode tab 402 may be bent. The cover assembly 300 is flipped over to be parallel to the isolation member 100, and the cover assembly 300 is pressed down to bend the pole ear 402 and form a pole ear bending portion 4021. When the cover assembly 300 is pressed to the lowest position, the first protrusion 303 and the second protrusion 304 of the cover assembly 300 respectively press the first fixing portion 40 and the second fixing portion 50 of the isolation member 100, so that the first limiting portion 10 of the isolation member 100 can better abut against the pole ear root 4022, effectively preventing the pole ear root 4022 from contacting the battery cell housing 200; then the two second limiting portions 20 of the isolation member 100 are folded upward, and the first clamping portions 21 on the two second limiting portions 20 are clamped on the second clamping portion 302 of the cover isolation member 305, so as to achieve the fixing of the bending angle between the two second limiting portions 20 and the first limiting portion 10, which can effectively prevent the isolation member 100 from opening. The first limiting portion 10 and the two second limiting portions 20 of the isolating element 100 are enclosed to form a first accommodating space for accommodating the tab bent portion 4021 .

[0087] like Figure 6 As shown, after the cover plate assembly 300, the pole core assembly 400 and the separator 100 are assembled into a whole, the whole is placed in the second accommodation space of the battery cell housing 200, and the cover plate assembly 300 is pressed with force to press the whole consisting of the cover plate assembly 300, the pole core assembly 400 and the separator 100 into the housing 200. It should be noted that since the isolation member 100 and the pole core 401 have a large contact area, the side deformation of the pole core 401 can be effectively avoided during the pressing process. After the pole core assembly 400 is assembled in the housing 200, the second limiting portion 20 of the separator 100 extends toward the opening and is located on the side of the second accommodation space close to the opening, and the first limiting portion 10 of the separator 100 abuts against the pole core 401.

[0088] In summary, in the embodiment of the present application, by providing a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion can enclose the isolating member to form a first accommodating space for accommodating the pole ear; wherein, the bottom of the isolating member can limit the root of the pole ear, and the side surface can limit the displacement of the bent portion of the pole ear along the second direction, thereby effectively isolating the pole ear in the first accommodating space, preventing the pole ear from contacting the battery cell shell to cause a battery short circuit, and improving the safety of the battery cell.

[0089] An embodiment of the present application further provides a battery device, which includes a battery case and the battery cell as described above, wherein the battery case has a receiving cavity, and the battery cell is received in the receiving cavity of the battery case.

[0090] The embodiment of the present application also provides an electric device, which includes the battery cell or battery device as described above. For example, the electric device can be an electric car, an energy storage system, an electronic device, etc. The present application does not specifically limit the type of electric device.

[0091] It should be noted that the battery device and electrical equipment provided in the present application have the same beneficial effects as the above-mentioned isolation member and battery cell, which will not be described in detail here.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0093] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A separator for isolating a tab and a shell of a battery cell, characterized in that: The isolating member includes a first limiting portion and a second limiting portion; wherein, The first limiting portion is provided with a first positioning hole, which penetrates the first limiting portion along the thickness direction of the first limiting portion, and is used to pass the pole lug; the first limiting portion and the second limiting portion enclose a first accommodating space for accommodating the pole lug.

2. The isolating element according to claim 1, characterized in that: The first limiting portion includes a first side and a second side arranged opposite to each other along a second direction. The number of the second limiting portions is two. The two second limiting portions extend along the thickness direction of the first limiting portion and are respectively connected to the first side and the second side of the first limiting portion. The second direction forms a preset angle with the thickness direction.

3. The isolating element according to claim 2, characterized in that: The isolating member further includes a bending portion connected between the first limiting portion and the second limiting portion, and the second limiting portion is bendably connected to the first limiting portion through the bending portion.

4. The isolating element according to claim 3, characterized in that: The thickness of the first limiting portion is a first thickness, the thickness of the second limiting portion is a second thickness, and the thickness of the bending portion is a third thickness; the third thickness is smaller than the first thickness and / or the second thickness.

5. The isolating element according to claim 4, characterized in that: The first thickness and the second thickness are both 0.5 mm to 1.2 mm, and the third thickness is 40% to 60% of the first thickness.

6. The isolating element according to any one of claims 3 to 5, characterized in that: The first limiting portion, the two second limiting portions and the bending portion are an integrally formed structure.

7. The isolating element according to any one of claims 1 to 5, characterized in that: A first clamping portion is disposed on a side of the second limiting portion away from the first limiting portion, and the first clamping portion is used for being matched and connected with the cover plate assembly of the battery cell.

8. The spacer according to any one of claims 1 to 5, characterized in that: The isolation member also includes a first fixing portion, the first limiting portion also includes a third side along the first direction, and the first fixing portion is connected to the third side of the first limiting portion; the first fixing portion is used to abut against the cover plate assembly of the battery cell, and the first direction is perpendicular to the thickness direction.

9. The isolating element according to claim 8, characterized in that: The first fixing portion is provided with a second positioning hole extending along the first direction, and the first positioning hole is communicated with the second positioning hole.

10. The isolating element according to claim 9, characterized in that: The width of the first positioning hole along the second direction is the first width, and the width of the second positioning hole along the second direction is the second width; wherein the second width is greater than the first width; and the second direction is perpendicular to the first direction.

11. The isolating element according to claim 10, characterized in that: The first width is 1 mm to 5 mm, and the second width is 0.8 mm to 2 mm.

12. The isolating element according to any one of claims 1 to 5, characterized in that: The first limiting portion and the second limiting portion are arranged at a preset angle α, and the preset angle α satisfies: 80°≤α≤90°.

13. The isolating element according to claim 8, characterized in that: The isolating member further includes a second fixing portion, the first limiting portion further includes a fourth side arranged opposite to the third side along the first direction, the second fixing portion is connected to the fourth side of the first limiting portion; the second fixing portion is used to abut against the cover plate assembly of the battery cell.

14. A battery cell, characterized in that: The battery cell comprises: a shell, a cover plate assembly, a pole core assembly, and an isolator according to any one of claims 1 to 13; wherein, A second accommodating space having an opening is provided in the shell; The pole core assembly is arranged in the second accommodation space, and the pole core assembly includes a pole core and a pole ear connected to the pole core, and the pole ear is close to the opening side; The cover plate assembly is connected to the opening side of the housing; The isolating member is arranged between the cover plate assembly, the pole core and the shell, the pole ear extends from the first positioning hole of the isolating member to the first accommodating space of the isolating member, the second limiting portion of the isolating member extends toward the opening, and the first limiting portion of the isolating member abuts against the pole core.

15. The battery cell according to claim 14, characterized in that: The cover plate assembly includes a cover plate and a cover plate isolating member, wherein the cover plate isolating member is connected to a side of the cover plate close to the pole core assembly, and the cover plate isolating member is also provided with a second clamping portion; a first clamping portion is provided on a side of the second limiting portion of the isolating member away from the first limiting portion of the isolating member, and the second clamping portion is clamped and matched with the first clamping portion to fix the isolating member to the cover plate assembly.

16. The battery cell according to claim 15, characterized in that: The cover plate isolating member is also provided with a first protrusion and a second protrusion on one side close to the pole core assembly, and the isolating member also includes a first fixing portion and a second fixing portion, and the first protrusion and the second protrusion are respectively used to press and fix the first fixing portion and the second fixing portion.

17. A battery device, characterized in that: It comprises a battery case and the battery cell according to any one of claims 14 to 16, wherein the battery cell is accommodated in the battery case.

18. An electrical equipment, characterized in that: Comprising the battery cell according to any one of claims 14 to 16 or the battery device according to claim 17.

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