Single battery and battery pack

Abstract

The utility model provides a single battery and a battery pack, and relates to the technical field of batteries. The single battery comprises a shell with a containing cavity and an opening, an electrode assembly arranged in the containing cavity, and a top cover assembly with a cover plate, a pole and an insulating structure layer. The cover plate is provided with a first pole hole and covers the opening, the first side, away from the opening, of the cover plate is provided with a groove communicated with the first pole hole, the pole penetrates through the first pole hole and is connected with the cover plate, the pole is electrically connected with the electrode assembly, and the groove surrounds the pole. The insulation structure layer is arranged on one side of the cover plate and provided with a second pole hole, the pole penetrating through the first pole hole further penetrates through the second pole hole, and the attaching portion of the insulation structure layer is attached to the groove wall of the groove and the pole respectively. According to the single battery provided by the invention, the creepage distance is increased, so that the possibility of short circuit is reduced, meanwhile, the effect of protecting the cover plate is also achieved, and the use safety of the single battery is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0002] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art.

[0003] The single cell is one of the important components of the battery pack. The top cover assembly of the single cell includes a pole, a cover plate and an insulating structure layer. The pole is inserted into the cover plate, and the insulating structure layer is arranged on the cover plate. Due to processing reasons, a groove of a certain depth will be formed around the pole on the cover plate, and a gap will be formed between the insulating structure layer and the bottom wall of the groove, resulting in a shorter creepage distance, which leads to the risk of external positive and negative short circuit of the single cell. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a single cell battery and a battery pack, aiming to solve the technical problem in the related art that there is a risk of short circuit between the external positive and negative electrodes of the single cell battery.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a single cell having a first direction, wherein the single cell comprises:

[0007] A housing is provided with a receiving cavity having an opening;

[0008] Top cover assembly, including:

[0009] A cover plate, which is disposed at the opening and is provided with a first pole hole, wherein two sides of the cover plate in the first direction are respectively a first side and a second side, the first side is disposed away from the opening, and the first side is provided with a groove communicating with the first pole hole;

[0010] A pole, which is passed through the first pole hole and connected to the cover plate, and the pole is used to be electrically connected to the electrode assembly in the accommodating cavity, and the groove is arranged around the pole; and

[0011] An insulating structure layer is arranged on the first side, a second pole hole is arranged on the insulating structure layer, and the pole passing through the first pole hole is passed through the second pole hole;

[0012] The insulating structure layer is provided with a fitting portion, the fitting portion is attached to the groove wall of the groove, and the fitting portion is attached to the pole.

[0013] In one embodiment of the first aspect, the fitting portion is recessed along the first direction toward the groove.

[0014] In one embodiment of the first aspect, the bonding portion is a second insulating layer, the insulating structure layer also includes a first insulating layer connected to the second insulating layer, the first insulating layer is attached to the first side, a through hole is provided on the first insulating layer, and the second insulating layer is located at the through hole.

[0015] In one embodiment of the first aspect, the second insulating layer includes a base layer and a first adhesive layer stacked and connected along the first direction, and the base layer is attached to the groove wall of the groove through the first adhesive layer.

[0016] In one embodiment of the first aspect, the substrate layer comprises a first sub-substrate layer; or

[0017] The base layer includes a plurality of second sub-base layers, the plurality of second sub-base layers are arranged at intervals along the first direction, and two adjacent second sub-base layers are connected by a second adhesive layer.

[0018] In one embodiment of the first aspect, the insulating structure layer is an insulating coating made by a spraying process.

[0019] In one of the embodiments of the first aspect, the insulating structure layer is an insulating glue layer made by coating with insulating glue.

[0020] In one embodiment of the first aspect, the insulating structure layer is an integrally formed insulating patch, and the fitting portion is a pit formed by a stamping process.

[0021] In one embodiment of the first aspect, a limiting member is disposed on the second side, the limiting member is disposed around the pole, and the limiting member and the cover plate define a limiting groove in the first direction and clamp the pole.

[0022] In a second aspect, an embodiment of the present application further provides a battery pack, comprising a single cell as described in any of the above embodiments.

[0023] The beneficial effects of this application are:

[0024] The single cell provided in the present application has a top cover assembly including a cover plate, an insulating structure layer and a pole. By arranging the insulating structure layer on the first side of the cover plate, and respectively fitting the bonding part of the insulating structure layer with the groove wall and the pole of the groove, a gap-free state is achieved between the insulating structure layer and the groove, thereby increasing the creepage distance and reducing the possibility of short circuit between the positive and negative poles of the single cell. At the same time, the insulating structure layer also plays a role in protecting the cover plate, reducing the risk of contaminating the cover plate and the pole after the electrolyte overflows during the injection process of the single cell. In this way, the safety of the single cell is effectively improved.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. 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 certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the exploded structure of a top cover assembly in the related art is shown;

[0028] Figure 2 A schematic diagram of the structure of a top cover assembly from a perspective in the related art is shown;

[0029] Figure 3 Shows Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0030] Figure 4 Shows Figure 3 The structural diagram of part B;

[0031] Figure 5 A schematic diagram of the exploded structure of a single cell in some embodiments of the present application is shown;

[0032] Figure 6 A schematic diagram of the exploded structure of the top cover assembly in some embodiments of the present application is shown;

[0033] Figure 7 A schematic structural diagram of a top cover assembly from one perspective in some embodiments of the present application is shown;

[0034] Figure 8 Shows Figure 7 Schematic diagram of the cross-section structure at CC in the middle;

[0035] Fig. 9Shows Figure 8 The structural diagram of the D part;

[0036] Fig.10 A schematic diagram of the composition structure of the second insulating layer in some embodiments of the present application is shown;

[0037] Fig.11 A schematic diagram of the composition structure of the second insulating layer in other embodiments of the present application is shown;

[0038] Fig.12 A schematic structural diagram of a top cover assembly from one perspective in some other embodiments of the present application is shown;

[0039] Fig.13 Shows a schematic diagram of the exploded structure of the top cover assembly in some other embodiments of the present application;

[0040] Fig.14 A schematic structural diagram of a top cover assembly from one perspective in some other embodiments of the present application is shown;

[0041] Fig.15 Shows Fig.14 Schematic diagram of the cross-sectional structure at EE in the middle;

[0042] Fig.16 Shows Fig.15 Schematic diagram of the structure of part F.

[0043] Description of main component symbols:

[0044] Description of the main component symbols in the related art: 200 - top cover assembly; 210 - cover plate; 211 - groove; 220 - insulation structure layer; 230 - pole; 240 - gap; 250 - creepage distance.

[0045] Description of the main element symbols in this application: 1000-single battery; 100-top cover assembly; 110-cover plate; 111-first side; 112-second side; 113-groove; 114-first pole hole; 115-liquid injection hole; 120-pole; 130-insulating structure layer; 131-first insulating layer; 1311-through hole; 132-second insulating layer; 1321-first sub-base layer; 1322 -first adhesive layer; 1323-second sub-base layer; 1324-second adhesive layer; 133-insulating patch; 134-insulating coating; 135-second pole hole; 136-avoidance hole; 137-fitting part; 140-pressure relief valve; 150-insulating part; 160-limiting part; 161-limiting groove; 300-shell; 310-opening; 320-accommodating chamber; 400-electrode assembly; X-first direction. DETAILED DESCRIPTION

[0046] The embodiments of the present application are 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 cannot be understood as limiting the present application.

[0047] 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.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the first aspect, the embodiments of the present application provide a single cell 1000, which relates to the field of battery technology and is mainly used in a battery pack. Of course, the single cell 1000 can also be directly used in electric vehicles, energy storage power stations, ships, spacecraft and other electrical devices without using a battery pack.

[0052] like Figure 5 As shown, the single battery 1000 provided in this embodiment has a first direction X, and includes: a housing 300 , an electrode assembly 400 and a top cover assembly 100 .

[0053] The housing 300 is provided with a housing cavity 320, the housing cavity 320 has an opening 310, and the electrode assembly 400 is arranged in the housing cavity 320. The top cover assembly 100 includes a cover plate 110, a pole 120 and an insulating structure layer 130, the cover plate 110 is provided at the opening 310, a first pole hole 114 is provided on the cover plate 110, and the two sides of the cover plate 110 in the first direction X are respectively a first side 111 and a second side 112, the first side 111 is arranged away from the opening 310, and a groove 113 connected to the first pole hole 114 is provided on the first side 111, the pole 120 is passed through the first pole hole 114 and connected to the cover plate 110, and the pole 120 is used to be electrically connected to the electrode assembly 400, and the groove 113 is arranged around the pole 120. The insulating structure layer 130 is arranged on the first side 111, and a second pole hole 135 is arranged on the insulating structure layer 130. The pole 120 passing through the first pole hole 114 is passed through the second pole hole 135. The insulating structure layer 130 is provided with a fitting portion 137, and the fitting portion 137 is attached to the groove wall of the groove 113, and the fitting portion 137 is also attached to the pole 120.

[0054] It should be noted that the electrode assembly 400 can be made by a winding process or a cutting and stacking process. The electrode assembly 400 can be a single single cell or can be composed of two stacked sub-cells.

[0055] like Figures 1 to 4 As shown, it should be mentioned that in the related art, the top cover assembly 200 includes a cover plate 210, an insulating structure layer 220 and a pole 230. The pole 230 is arranged through the cover plate 210, and the insulating structure layer 220 is arranged on the cover plate 210. Due to processing reasons, the cover plate 210 will form a groove 211 of a certain depth around the pole 230 (that is, during the stamping process of the cover plate 210, a part of the area will be used as a support position, and this area will be subjected to the stamping pressure to form a pit of a certain depth). However, a gap 240 will be formed between the insulating structure layer 220 and the bottom wall of the groove 211, resulting in a shorter creepage distance 250, thereby increasing the risk of short circuit between the positive and negative electrodes outside the single battery.

[0056] In order to solve the above technical problems, in this embodiment, the insulating structure layer 130 is arranged on the first side 111 of the cover plate 110, and the fitting portion 137 of the insulating structure layer 130 is attached to the groove wall of the groove 113, and the fitting portion 137 is attached to the pole 120, so as to achieve a gap-free state between the insulating structure layer 130 and the groove 113, so as to increase the creepage distance, thereby reducing the possibility of short circuit between the positive and negative electrodes of the single battery 1000. At the same time, the insulating structure layer 130 also plays a role in protecting the cover plate 110, reducing the risk of contaminating the cover plate 110 and the pole 120 due to electrolyte overflow during the injection process of the single battery 1000. In this way, the safety of the single battery 1000 is effectively improved.

[0057] like Figure 5 As shown, illustratively, the fitting portion 137 is recessed along the first direction X toward the groove 113 , so that the fitting portion 137 and the groove wall of the groove 113 are fitted together.

[0058] like Figures 6 to 9 As shown, in one embodiment, the bonding portion 137 is a second insulating layer 132 , and the insulating structure layer 130 also includes a first insulating layer 131 connected to the second insulating layer 132 . The first insulating layer 131 is attached to the first side 111 and is provided with a through hole 1311 , and the second insulating layer 132 is located at the through hole 1311 .

[0059] In this embodiment, since the second insulating layer 132 is respectively attached to the groove wall of the groove 113 and the pole 120, a gap-free state is achieved between the insulating structure layer 130 and the groove 113, and at the same time, the first insulating layer 131 is attached to the first side 111 of the cover plate 110. Thus, the creepage distance is increased, thereby reducing the possibility of short circuit between the positive and negative electrodes.

[0060] like Fig. 9 As shown, in a specific embodiment, the material of the second insulating layer 132 includes polyethylene glycol terephthalate (PET), and the thickness of the second insulating layer 132 is T1, which satisfies: 0.07 mm≤T1≤0.1 mm.

[0061] Exemplarily, T1 can be selected from any value of 0.07mm, 0.075mm, 0.076mm, 0.8mm, 0.9mm, 0.95mm, 0.97mm, 0.1mm or any value in a range consisting of any two of them, and the specific selection can be made according to design requirements.

[0062] In this embodiment, since polyethylene terephthalate has excellent electrical insulation, creep resistance, fatigue resistance, friction resistance and dimensional stability, polyethylene terephthalate is used as one of the materials of the second insulating layer 132, and the thickness of the second insulating layer 132 is controlled within the range of 0.07mm to 0.1mm, so that the structural stability and insulation effect of the insulating structure layer 130 are improved, thereby reducing the possibility of short circuit between the positive and negative electrodes of the single battery 1000.

[0063] like Fig.10 and Fig.11 As shown, further, the second insulating layer 132 includes a base layer and a first adhesive layer 1322 which are stacked and connected along the first direction X, and the base layer is attached to the groove wall of the groove 113 through the first adhesive layer 1322 .

[0064] It should be noted that the material of the base layer includes polyethylene terephthalate.

[0065] In this embodiment, the base layer made of polyethylene terephthalate is attached to the groove wall of the groove 113 through the first adhesive layer 1322, and the total thickness of the base layer and the first adhesive layer 1322 is in the range of 0.07mm to 0.1mm, so as to achieve effective insulation effect and reduce the possibility of short circuit between the positive and negative electrodes.

[0066] like Fig.10 As shown, exemplarily, the base layer includes a first sub-base layer 1321 , the first sub-base layer 1321 is bonded to the cover plate 110 via a first adhesive layer 1322 , and the total thickness of the first sub-base layer 1321 and the first adhesive layer 1322 is in the range of 0.07 mm to 0.1 mm.

[0067] like Fig.11 As shown, of course, in another exemplary embodiment, the base layer includes a plurality of second sub-base layers 1323, the plurality of second sub-base layers 1323 are arranged at intervals along the first direction X, two adjacent second sub-base layers 1323 are connected by a second adhesive layer 1324, and the total thickness of the plurality of second sub-base layers 1323, at least one second adhesive layer 1324 and the first adhesive layer 1322 is in the range of 0.07 mm to 0.1 mm.

[0068] It should be noted that the first adhesive layer 1322 and the second adhesive layer 1324 may be made of UV adhesive (epoxy modified acrylic resin), acrylic adhesive (methyl methacrylate + butyl acrylate), silicone rubber, etc. In addition, in addition to the second insulating layer 132 being a combined structure of a base layer and an adhesive layer, the first insulating layer 131 may also be a layered structure, which will not be described in detail herein.

[0069] like Fig.12As shown, in another embodiment, the insulating structure layer 130 is an insulating coating 134 made by a spraying process, or the insulating structure layer 130 is an insulating glue layer made by coating with insulating glue.

[0070] It can be understood that the insulating structure layer 130 can be an insulating coating 134 sprayed on the first side 111 of the cover plate 110, or it can be an insulating glue layer formed by coating an insulating glue on the cover plate 110. Both methods can form an effective insulation effect on the cover plate 110, thereby reducing the risk of short circuit between the positive and negative electrodes of the single cell 1000.

[0071] Furthermore, the material of the insulating coating 134 is one of polyurethane (PU), acrylic acid (Acrylic acid) and polyvinyl alcohol (PVA), and the thickness of the insulating coating 134 is T2, which satisfies: 0.01 mm≤T2≤0.5 mm.

[0072] Exemplarily, T2 can be selected from any value of 0.01mm, 0.02mm, 0.03mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.24mm, 0.3mm, 0.32mm, 0.4mm, 0.49mm, 0.5mm or any value in a range consisting of any two of them, and can be set specifically according to design requirements.

[0073] In this embodiment, by using one of the above materials to spray to form an insulating coating 134, and controlling the thickness of the insulating coating 134 within the range of 0.01 mm to 0.5 mm, an effective insulating effect can be formed on the cover plate 110, thereby reducing the risk of short circuit between the positive and negative electrodes of the single battery 1000.

[0074] like Figures 13 to 16 As shown, in another embodiment, the insulating structure layer 130 is an integrally formed insulating patch 133, the fitting portion 137 is a recess made by a stamping process, the thickness of the insulating patch 133 is T3 and the material is polycarbonate, satisfying: 0.1mm≤T3≤0.3mm.

[0075] Exemplarily, T3 can select any value among 0.1mm, 0.12mm, 0.16mm, 0.2mm, 0.21mm, 0.23mm, 0.28mm, 0.3mm or any value in a range consisting of any two of them, and can be set specifically according to design requirements.

[0076] In this embodiment, a stamping process is used to form a pit on the insulating patch 133, so that the pit is respectively fitted with the wall of the pole 120 and the groove 113 to achieve a gapless contact state, and the thickness of the insulating patch 133 is controlled within the range of 0.1mm to 0.3mm, which can form an effective insulation effect on the cover plate 110 to reduce the risk of short circuit between the positive and negative electrodes of the single battery 1000.

[0077] like Fig.15 and Fig.16 As shown, further, the thickness of the cover plate 110 is T, which satisfies: 0.035≤T3 / T≤0.5.

[0078] Exemplarily, T3 / T can be selected from any value of 0.035, 0.05, 0.1, 0.15, 0.2, 0.23, 0.26, 0.3, 0.35, 0.4, 0.47, 0.5 or any value in a range consisting of any two of them, and can be set specifically according to design requirements.

[0079] In this embodiment, by setting the thickness of the insulating patch 133 to 3.5% to 50% of the thickness of the cover plate 110 , the insulating patch 133 can form a more effective insulating effect on the cover plate 110 .

[0080] like Figure 8 and Fig. 9 As shown, in one embodiment, a limiting member 160 is provided on the second side 112 and is arranged around the pole 120. The limiting member 160 and the cover plate 110 define a limiting groove 161 in the first direction X and clamp the pole 120 to achieve connection between the cover plate 110 and the portion of the pole 120 that passes through the first pole hole 114.

[0081] like Figure 6 and Fig.13 As shown, in one embodiment, a liquid injection hole 115 and a pressure relief valve 140 are provided on the cover plate 110, the pressure relief valve 140 and the liquid injection hole 115 are arranged at intervals, the insulating structure layer 130 covers the liquid injection hole 115, and the insulating structure layer 130 is provided with an avoidance hole 136 passing through it, and the avoidance hole 136 is arranged opposite to the pressure relief valve 140.

[0082] In this embodiment, based on the above structure, after the electrolyte is injected into the housing 300 through the injection hole 115, the insulating structure layer 130 is arranged on the side of the cover plate 110 away from the electrode assembly 400 to cover the injection hole 115, which can reduce the risk of the electrolyte overflowing from the injection hole 115 to the cover plate 110. At the same time, by setting the avoidance hole 136, the insulating structure layer 130 will not affect the pressure relief function of the pressure relief valve 140 on the basis of insulation and blocking the electrolyte from overflowing.

[0083] like Figure 6 and Fig.13 As shown, in one embodiment, the single battery 1000 further includes an insulating member 150 , which is disposed on the second side 112 of the cover plate 110 , such that the cover plate 110 is located between the insulating structure layer 130 and the insulating member 150 .

[0084] In this embodiment, the insulating structure layer 130 and the insulating member 150 are used in combination to effectively reduce the risk of short circuit between the positive and negative electrodes of the single battery 1000, thereby improving the safety of use.

[0085] In a second aspect, an embodiment of the present application provides a battery pack, comprising a single cell 1000 in any of the above embodiments.

[0086] It is understandable that, since the battery pack provided in this embodiment has the single cell 1000 in any of the above embodiments, it has all the beneficial effects of the single cell 1000, which will not be listed one by one here.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A single cell battery, characterized in that: Having a first direction (X), the single battery comprises: The housing (300) is provided with a receiving cavity (320) having an opening (310); the top cover assembly (100) comprises: a cover plate (110), which is arranged to cover the opening (310), and a first pole hole (114) is provided on the cover plate (110); two sides of the cover plate (110) in the first direction (X) are respectively a first side (111) and a second side (112); the first side (111) is arranged away from the opening (310); and the first side (111) is provided with a groove (113) communicating with the first pole hole (114); A pole (120) is inserted into the first pole hole (114) and connected to the cover plate (110), and the pole (120) is used to be electrically connected to the electrode assembly (400) in the accommodating cavity (320), and the groove (113) is arranged around the pole (120); and An insulating structure layer (130) is arranged on the first side (111), a second pole hole (135) is arranged on the insulating structure layer (130), and the pole (120) passing through the first pole hole (114) is passed through the second pole hole (135); The insulating structure layer (130) is provided with a bonding portion (137), the bonding portion (137) is bonded to the groove wall of the groove (113), and the bonding portion (137) is bonded to the pole (120).

2. The single cell according to claim 1, characterized in that: The fitting portion (137) is recessed along the first direction (X) toward a direction close to the groove (113).

3. The single cell according to claim 1, characterized in that: The bonding portion (137) is a second insulating layer (132), and the insulating structure layer (130) further includes a first insulating layer (131) connected to the second insulating layer (132), the first insulating layer (131) is bonded to the first side (111), a through hole (1311) is provided on the first insulating layer (131), and the second insulating layer (132) is located at the through hole (1311).

4. The single cell according to claim 3, characterized in that: The second insulating layer (132) comprises a base layer and a first adhesive layer (1322) which are stacked and connected along the first direction (X), and the base layer is attached to the groove wall of the groove (113) through the first adhesive layer (1322).

5. The single cell according to claim 4, characterized in that: The substrate layer includes a first sub-substrate layer (1321); or The base layer comprises a plurality of second sub-base layers (1323), wherein the plurality of second sub-base layers (1323) are arranged at intervals along the first direction (X), and two adjacent second sub-base layers (1323) are connected via a second adhesive layer (1324).

6. The single cell according to claim 1, characterized in that: The insulating structural layer (130) is an insulating coating (134) made by a spraying process.

7. The single cell according to claim 1, characterized in that: The insulating structure layer (130) is an insulating adhesive layer made by coating with insulating adhesive.

8. The single cell according to claim 1, characterized in that: The insulating structure layer (130) is an integrally formed insulating patch (133), and the fitting portion (137) is a recess formed by a stamping process.

9. The single cell according to any one of claims 1 to 8, characterized in that: The second side (112) is provided with a limiting member (160), the limiting member (160) is arranged around the pole (120), and the limiting member (160) and the cover plate (110) define a limiting groove (161) in the first direction (X) and clamp the pole (120).

10. A battery pack, characterized in that: A single cell comprising the single cell according to any one of claims 1 to 9.

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