Battery cell cover plate assembly, battery cell, and battery pack

Abstract

The utility model relates to battery technical field discloses the electric core cover plate subassembly, electric core and battery package, wherein the electric core cover plate subassembly, include: cover plate, pole, insulating part and heat insulating part, cover plate is equipped with the mounting hole that penetrates along Z direction, the pole is inserted in the mounting hole along Z direction and the top extends the upper surface of cover plate, and the top of pole is surrounded along Z direction and extends and forms the annular flange, the insulating part is set up in the top of cover plate and is set up in the pole outside, the heat insulating part is set up in the top of insulating part and is installed in the pole outside, forms the stop portion through the annular flange that turns outward, to make insulating part and heat insulating part sandwich between stop portion and cover plate. The utility model increases and sets up the heat insulating part between the stop portion of insulating part and pole, can reduce the heat that transfers to insulating part in the welding process, reduces the risk of heat melting of insulating part, and then avoids appearing pole subsidence, and the situation that sealing ring compression amount reduces, to guarantee the sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell cover assembly, a cell, and a battery pack. Background Technology

[0002] New energy batteries have become a research hotspot in the power battery field due to their relatively mature technology. The battery cell, as the core component of the battery pack, mainly includes external insulation components, encapsulated electrode assembly components, internal insulation components of the cover plate, and electrical connection components. The electrode assembly inside the cell is electrically connected to the terminals on the cover plate, and positive and negative terminals are led out respectively, forming a complete circuit.

[0003] The new energy battery market has an increasing demand for fast charging and longer driving range, and the current requirements for battery cells are also getting higher. The current-carrying area of ​​the connecting piece and the cover plate needs to be further increased, which leads to higher temperatures during the welding process. The temperature conducted to the insulation component is also getting higher and higher. When the temperature exceeds the heat deformation temperature of the insulation component, the insulation component melts, which causes the terminal post to sink, the compression of the sealing ring to decrease, and ultimately the cover plate seal to fail. Utility Model Content

[0004] In view of this, the present invention provides a cell cover assembly, a cell, and a battery pack to solve the problem that the insulating parts are easily affected by the welding temperature and melt, leading to the failure of the cover seal.

[0005] In a first aspect, this utility model provides a battery cell cover assembly, comprising: The cover plate has a through mounting hole along the Z direction; The pole post is inserted into the mounting hole along the Z direction and extends out of the upper surface of the cover plate. The top of the pole post extends around the Z direction to form an annular flange. An insulating component is sleeved outside the pole and located on the top of the cover plate; A heat insulation component is sleeved outside the pole and installed on the top of the insulating component. A stop portion is formed by folding the annular flange outward, so that the insulating component and the heat insulation component are sandwiched between the stop portion and the cover plate.

[0006] Beneficial effects: The battery cell cover assembly of this utility model adds a heat insulation component between the insulating component and the stop portion of the electrode post. The heat insulation component can reduce the heat transferred to the insulating component during welding, reduce the risk of the insulating component melting, and thus avoid the electrode post sinking and the reduction of the sealing ring compression, thereby ensuring the sealing effect of the sealing ring on the cover plate. Moreover, an annular flange is first formed by extending along the Z direction around the top of the electrode post, which facilitates the fitting of the insulating component and the heat insulation component onto the electrode post. Then, the annular flange is folded outward to form the stop portion, which can fix the insulating component and the heat insulation component between the stop portion and the cover plate, making the connection firm and easy to install.

[0007] In one optional embodiment, the heat insulation element is annular and is arranged circumferentially around the mounting hole. The width of the heat insulation element in the XY plane is L1, and the width of the stop portion in the XY plane is L2, satisfying 0.4≤L1 / L2≤0.7.

[0008] Beneficial effects: Insulating components are generally ring-shaped. By correspondingly arranging the heat insulation component in a ring shape and controlling L1 / L2 within a suitable range, the heat insulation area can be expanded, ensuring the heat insulation effect and guaranteeing the structural strength of the stop. Furthermore, it ensures that the shapes of the heat insulation component and the insulating component are compatible, allowing for uniform heat insulation and preventing localized heat melting of the insulating component. If the value of L1 / L2 is too large, the width of the stop is relatively small, resulting in weak structural strength and difficulty in meeting the requirements for thrust and torsional force and strength. If the value of L1 / L2 is too small, the width of the heat insulation component is relatively small, resulting in a smaller heat insulation area and difficulty in guaranteeing the heat insulation effect.

[0009] In one alternative implementation, 1 mm ≤ L1 ≤ 1.5 mm; And / or, 2 mm ≤ L2 ≤ 3 mm.

[0010] Beneficial effects: By controlling L1 within a suitable range, the insulation component can be guaranteed to have a sufficiently large insulation area to ensure optimal insulation performance. Since the stop is generally formed by stamping and folding annular flanges, controlling L2 within a suitable range can ensure that the stop has sufficient structural strength.

[0011] In one alternative embodiment, the heat insulation element is a ceramic gasket.

[0012] Beneficial effects: Ceramic gaskets possess excellent high-temperature resistance and a low coefficient of thermal expansion, resulting in good thermal insulation. Furthermore, their dimensional changes after heating are minimal, minimizing impact on the use of the cell cover assembly. Additionally, ceramic gaskets offer insulation properties, further protecting the cover and terminal post.

[0013] In one optional embodiment, the thickness of the heat insulation element along the Z direction is H1, and the height of the pole extending from the upper surface of the cover plate along the Z direction is H2, satisfying 0.2≤H1 / H2≤0.4.

[0014] Beneficial effects: By controlling H1 / H2 within a suitable range, it is possible to ensure that the insulating parts are not affected by welding heat, thereby further reducing the risk of thermal melting of the insulating parts.

[0015] In one optional implementation, 0.5 mm ≤ H1 ≤ 1 mm is satisfied; And / or, satisfying 2.5 mm ≤ H2 ≤ 3 mm.

[0016] Beneficial effects: By controlling H1 within a suitable range, sufficient structural strength of the insulation component can be ensured while maintaining insulation effectiveness. By controlling H2 within a suitable range, the height of the electrode post can be reduced, which also reduces the integration height of the cell cover assembly, thereby reducing the cell volume and improving the cell's energy density.

[0017] In one optional embodiment, the thickness of the insulating element along the Z direction is H3, satisfying 1 mm ≤ H3 ≤ 1.5 mm.

[0018] Beneficial effects: By controlling H3 within a suitable range, it is possible to ensure that the insulating component has sufficient structural strength and prevent the insulating component from breaking under stress during the process of forming the stop part by folding the stamped annular flange.

[0019] In one alternative embodiment, along the Z-direction, the bottom of the insulating member extends at least partially into the mounting hole, and the top of the insulating member extends at least partially into the sidewall of the stop portion.

[0020] Beneficial effects: Extending at least part of the bottom of the insulating plate into the mounting hole effectively achieves insulation between the pole and the cover plate. Extending at least part of the top of the insulating element into the side wall of the stop portion allows the insulating element to partially limit the stop portion.

[0021] Secondly, this utility model also provides a battery cell, comprising: The housing has an opening at at least one end; The electrode assembly is installed inside the housing; The aforementioned cell cover assembly has the cover plate placed over the opening and connected to the housing.

[0022] Beneficial effects: The battery cell of this utility model incorporates a heat insulation component between the insulating component and the stop portion of the electrode post. This reduces the temperature transferred to the insulating component during welding, lowering the risk of thermal melting and preventing electrode post sagging and reduced sealing ring compression, thus ensuring the sealing effect of the sealing ring on the cover plate. Furthermore, an annular flange is first formed around the top of the electrode post along the Z-direction, facilitating the fitting of the insulating and heat insulation components onto the electrode post. The annular flange is then folded outwards to form a stop portion, which securely clamps the insulating and heat insulation components between the stop portion and the cover plate, ensuring a firm connection and facilitating installation.

[0023] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0024] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an exploded view of a battery cell cover assembly according to an embodiment of the present utility model; Figure 2 This is a top view of a battery cell cover assembly according to an embodiment of the present utility model; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 for Figure 2 Sectional view at point BB; Figure 5 This is a schematic diagram of the structure of the electrode post stop portion of a battery cell cover assembly before it is folded up, according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Mounting hole; 2. Pole post; 201. Annular flange; 202. Stop part; 3. Insulating component; 4. Heat insulation component; 5. Sealing ring; 6. Insulating plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the embodiments of the utility model, the "battery pack" is formed by combining a certain number of battery cells into a battery module and placing them in a housing to protect the battery cells from external impacts, heat, vibration, etc. The battery pack also includes a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, etc., and is sealed by a cover plate to form a complete functional unit that can directly output electrical energy.

[0030] In the embodiments of this utility model, "cell" refers to a single battery cell capable of independent charging and discharging. A cell includes a positive electrode, a negative electrode, a separator, an electrolyte, and a casing for encapsulating the positive electrode, negative electrode, separator, and electrolyte. The embodiments of this utility model do not impose particular limitations on the type or shape of the cell; it can be a blade cell, a prismatic cell, or other types of battery. The cell in the embodiments of this utility model can be a lithium-ion cell, a potassium-ion cell, a sodium-ion cell, a lithium-sulfur cell, etc., with lithium-ion cells being particularly preferred.

[0031] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, in a first aspect, as follows: Figure 1 and Figure 2 As shown, a battery cell cover assembly is provided, mainly including: a cover plate 1, a terminal post 2, an insulating member 3, and a heat insulation member 4. The cover plate 1 has a through mounting hole 101 along the Z direction. The terminal post 2 is inserted into the mounting hole 101 along the Z direction and extends its top beyond the upper surface of the cover plate 1. An annular flange 201 extends around the top of the terminal post 2 along the Z direction. The insulating member 3 is sleeved on the outside of the terminal post 2 and located on the top of the cover plate 1. The heat insulation member 4 is sleeved on the outside of the terminal post 2 and installed on the top of the insulating member 3. A stop portion 202 is formed by folding the annular flange 201 outwards, so that the insulating member 3 and the heat insulation member 4 are sandwiched between the stop portion 202 and the cover plate 1.

[0033] Therefore, the battery cell cover assembly provided in this embodiment of the present invention adds a heat insulation component 4 between the insulating component 3 and the stop portion 202 of the electrode post 2. The heat insulation component 4 can reduce the heat transferred to the insulating component 3 during the welding process, reduce the risk of the insulating component 3 melting, and thus avoid the electrode post 2 sinking and the sealing ring 5 compression reduction, thereby ensuring the sealing effect of the sealing ring 5 on the cover plate 1. Moreover, an annular flange 201 is first formed by extending along the Z direction around the top of the electrode post 2, which facilitates the smooth fitting of the insulating component 3 and the heat insulation component 4 onto the electrode post 2. Then, the annular flange 201 is folded outward to form the stop portion 202, which can fix the insulating component 3 and the heat insulation component 4 between the stop portion 202 and the cover plate 1, making the connection firm and easy to install.

[0034] Specifically, in the Z direction, such as Figure 3 and Figure 4 As indicated by arrow Z in the diagram.

[0035] It should be noted that the terminal post 2 is electrically connected to the electrode group of the battery cell via a connecting piece. The connecting piece is welded to the electrode group, and the terminal post 2 is also welded to the connecting piece. Additionally, the terminal post 2 is welded to the busbar to connect different battery cells in series or parallel to form a battery module. In traditional battery cell cover assemblies, the terminal post is in direct contact with the insulating component. Therefore, heat can be directly transferred to the insulating component through the terminal post, causing the insulating component to easily melt after the welding temperature rises, ultimately leading to the failure of the battery cell cover assembly's seal. In this embodiment of the invention, a heat insulation component 4 is added between the insulating component 3 and the stop portion 202 of the terminal post 2. This avoids direct contact between the terminal post 2 and the insulating component 3, and the heat insulation component 4 reduces the heat transferred to the insulating component 3 during welding, thereby reducing the risk of the insulating component 3 melting.

[0036] Furthermore, such as Figure 1 and Figure 3 As shown, the cell cover assembly also includes a sealing ring 5 and an insulating plate 6. The sealing ring 5 is fitted over the electrode post 2 and located inside the mounting hole 101. The bottom of the electrode post 2 has a flange. When the annular flange 201 is folded to form a stop 202, the sealing ring 5 is sandwiched between the cover plate 1 and the flange and has a certain amount of compression, thereby forming an effective seal. The insulating plate 6 is provided on the lower surface of the cover plate 1 and is used for insulation between the cover plate 1 and the cell. In addition, the cover plate 1 can also be provided with components such as an explosion-proof valve and a liquid injection hole.

[0037] It should be noted that the material of the insulating component 3 is not limited in this embodiment of the utility model. Any existing material can be selected as needed, such as plastic for the insulating component 3.

[0038] In one embodiment, such as Figure 1 and Figure 4 As shown, the heat insulation component 4 is annular and is arranged around the mounting hole 101. The width of the heat insulation component 4 in the XY plane is L1, and the width of the stop part 202 in the XY plane is L2, satisfying 0.4≤L1 / L2≤0.7.

[0039] The insulating component 3 is generally annular. The heat insulation component 4 is correspondingly annular, and the ratio L1 / L2 is controlled within a suitable range. This expands the heat insulation area, ensuring the heat insulation effect and the structural strength of the stop portion 202. It also ensures that the shapes of the heat insulation component 4 and the insulating component 3 are compatible, allowing for uniform heat insulation and preventing localized melting of the insulating component 3. If the value of L1 / L2 is too large, the width of the stop portion 202 will be relatively small, resulting in weak structural strength and difficulty in meeting the requirements for thrust and strength. If the value of L1 / L2 is too small, the width of the heat insulation component 4 will be relatively small, resulting in a smaller heat insulation area and difficulty in ensuring the heat insulation effect.

[0040] Specifically, the X direction is as follows: Figure 2 and Figure 3As shown by the arrow X in the diagram, the Y direction is as follows: Figure 2 and Figure 4 As indicated by arrow Y, the XY plane is the plane formed by the X and Y directions.

[0041] Furthermore, in one embodiment, 1 mm ≤ L1 ≤ 1.5 mm. By controlling L1 within a suitable range, it is possible to ensure that the heat insulation element 4 has a sufficiently large heat insulation area to ensure the heat insulation effect.

[0042] Furthermore, in one embodiment, 2 mm ≤ L2 ≤ 3 mm. Since the stop portion 202 is generally formed by stamping and folding an annular flange 201, by controlling L2 within a suitable range, it can be ensured that the stop portion 202 has sufficient structural strength.

[0043] For example, in this embodiment of the present invention, L1 can be 1 mm and L2 can be 2 mm, then L1 / L2 is 0.5; or, L1 can be 1.5 mm and L2 can be 2.5 mm, then L1 / L2 is 0.6; or, L1 can be 1.2 mm and L2 can be 3 mm, then L1 / L2 is 0.4.

[0044] It should be noted that the material of the heat insulation component 4 is not limited in this embodiment of the utility model. Any existing material can be selected as needed, as long as the heat insulation component 4 can reduce the heat transferred to the insulating component 3 during the welding process.

[0045] In one embodiment, the heat insulation element 4 is a ceramic gasket. Ceramic gaskets possess excellent high-temperature resistance and a low coefficient of thermal expansion, resulting in good heat insulation. Furthermore, they exhibit minimal dimensional change after heating, minimizing their impact on the use of the cell cover assembly. Additionally, the ceramic gasket also provides insulation, further protecting the cover 1 and the terminal post 2.

[0046] In one embodiment, such as Figure 4 As shown, the thickness of the heat insulation component 4 along the Z direction is H1, and the height of the pole post 2 extending from the upper surface of the cover plate 1 along the Z direction is H2, satisfying 0.2≤H1 / H2≤0.4. By controlling H1 / H2 within a suitable range, it can be ensured that the insulation component 3 is not affected by welding heat, further reducing the risk of hot melting of the insulation component 3.

[0047] Furthermore, in one embodiment, the condition 0.5 mm ≤ H1 ≤ 1 mm is satisfied. By controlling H1 within a suitable range, it is possible to ensure that the thermal insulation element 4 has sufficient structural strength while ensuring the thermal insulation effect.

[0048] Furthermore, in one embodiment, the condition 2.5 mm ≤ H2 ≤ 3 mm is satisfied. By controlling H2 within a suitable range, the height of the electrode post 2 can be reduced, that is, the integration height of the cell cover assembly can be reduced, and the volume of the cell can be reduced, thereby improving the energy density of the cell.

[0049] For example, in this embodiment of the present invention, H1 can be 0.5 mm, H2 can be 2.5 mm, then H1 / H2 is 0.2, or H1 can be 0.7 mm, H2 can be 2.8 mm, then H1 / H2 is 0.25, or H1 can be 1 mm, H2 can be 2.5 mm, then H1 / H2 is 0.4.

[0050] In one embodiment, such as Figure 4 As shown, the thickness of the insulating component 3 along the Z direction is H3, which satisfies 1 mm ≤ H3 ≤ 1.5 mm. By controlling H3 within a suitable range, it is possible to ensure that the insulating component 3 has sufficient structural strength to prevent the insulating component 3 from breaking under stress during the process of the stamped annular flange 201 folding over to form the stop portion 202.

[0051] For example, in this embodiment of the present invention, H3 can be 1 mm, 1.25 mm, or 1.5 mm.

[0052] Furthermore, in one embodiment, 0.5 ≤ H1 / H3 ≤ 0.6, to further ensure the strength and insulation effect of the insulation component 4.

[0053] In one embodiment, such as Figure 4 As shown, along the Z direction, the bottom of the insulating member 3 extends at least partially into the mounting hole 101, and the top of the insulating member 3 extends at least partially into the side wall of the stop portion 202. Extending the bottom of the insulating plate 6 at least partially into the mounting hole 101 effectively achieves insulation between the pole post 2 and the cover plate 1. Extending the top of the insulating member 3 at least partially into the side wall of the stop portion 202 allows the insulating member 3 to partially limit the stop portion 202.

[0054] In addition, the portion of the insulating element 3 extending into the mounting hole 101 can also contact the top of the sealing ring 5 to further enhance the sealing and insulation effect.

[0055] According to an embodiment of the present invention, in a second aspect, a battery cell is also provided, mainly comprising: a housing, an electrode assembly, and a battery cell cover assembly. The housing has an opening at at least one end; the electrode assembly is installed inside the housing; and the cover plate 1 of the battery cell cover assembly covers the opening and is connected to the housing.

[0056] The battery cell provided in this embodiment of the utility model has a heat insulation component 4 added between the insulating component 3 and the stop portion 202 of the electrode post 2. This reduces the heat transferred to the insulating component 3 during the welding process, reduces the risk of the insulating component 3 melting, and thus avoids the electrode post 2 sinking and the sealing ring 5 compression reduction, thereby ensuring the sealing effect of the sealing ring 5 on the cover plate 1. Moreover, an annular flange 201 is first formed by extending along the Z direction around the top of the electrode post 2, which facilitates the fitting of the insulating component 3 and the heat insulation component 4 onto the electrode post 2. Then, the annular flange 201 is folded outward to form the stop portion 202, which can fix the insulating component 3 and the heat insulation component 4 between the stop portion 202 and the cover plate 1, making the connection firm and easy to install.

[0057] In embodiments of this utility model, the "shell" is a component used to provide a receiving space to house components such as the electrode assembly (including positive and negative electrode plates), the diaphragm, and the electrolyte, and to isolate them from the outside world.

[0058] The casing material includes, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film. For square cells, the casing is generally made by stamping, while for blade cells, the casing is generally formed by folding and welding sheet metal parts.

[0059] According to an embodiment of the present invention, in a third aspect, a battery pack is also provided, mainly comprising: at least one battery cell.

[0060] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0061] According to an embodiment of the present invention, in a fourth aspect, a method for assembling a battery cell cover assembly is also provided, comprising: S100, A through mounting hole 101 is made on the cover plate 1 along the Z direction.

[0062] S200. A ring-shaped flange 201 extending in the Z direction is machined around the top of the pole post 2. The pole post 2 is inserted into the mounting hole 101 in the Z direction and the top of the pole post 2 extends out of the upper surface of the cover plate 1.

[0063] S300, The insulating component 3 is sleeved outside the pole post 2 and installed on the top of the cover plate 1; S400, The heat insulation component 4 is sleeved outside the pole post 2 and installed on the top of the insulation component 3.

[0064] S500, stamping annular flange 201, causing the annular flange 201 to fold outward to form a stop portion 202, and clamping the insulating part 3 and the heat insulation part 4 between the stop portion 202 and the cover plate 1, finally forming the cell cover plate assembly.

[0065] The assembly method of the battery cell cover assembly provided in this embodiment of the utility model adds a heat insulation component 4 between the insulating component 3 and the stop portion 202 of the electrode post 2. This reduces the temperature transferred to the insulating component 3 during welding, reduces the risk of the insulating component 3 melting, and thus avoids the electrode post 2 sinking and the compression of the sealing ring 5 decreasing, thereby ensuring the sealing effect of the sealing ring 5 on the cover 1. Moreover, an annular flange 201 is first formed by extending along the Z direction around the top of the electrode post 2, which facilitates the fitting of the insulating component 3 and the heat insulation component 4 onto the electrode post 2. Then, the annular flange 201 is folded outward to form the stop portion 202, which can fix the insulating component 3 and the heat insulation component 4 between the stop portion 202 and the cover 1, making the connection firm and easy to install.

[0066] Specifically, in the steps, mounting holes 101 can be made on the cover plate 1 by machining.

[0067] In step S200, as Figure 5 As shown, the annular flange 201 can be machined on the top of the electrode post 2. For the positive electrode post, the annular flange 201 can also be machined by cold heading.

[0068] In step S500, the annular flange 201 extends in the Z direction at the leading edge of the stamping. To facilitate processing, the annular flange 201 is first folded outward at a certain angle using a punch, for example, the annular flange 201 is at an angle of 30°, 45°, or 60° relative to the surface of the cover plate 1. Then, the annular flange 201 is folded to the XY plane using a punch, thus forming the stop portion 202. The insulating component 3 and the heat insulation component 4 are clamped between the stop portion 202 and the cover plate 1 without welding. In addition, during the stamping process, the already installed parts need to be fixed between the upper and lower dies to improve stamping accuracy.

[0069] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cell cover assembly, characterized in that, include: The cover plate has a through mounting hole along the Z direction; The pole post is inserted into the mounting hole along the Z direction and extends out of the upper surface of the cover plate. The top of the pole post extends around the Z direction to form an annular flange. An insulating component is sleeved outside the pole and located on the top of the cover plate; A heat insulation component is sleeved outside the pole and installed on the top of the insulating component. A stop portion is formed by folding the annular flange outward, so that the insulating component and the heat insulation component are sandwiched between the stop portion and the cover plate.

2. The cell cover assembly according to claim 1, characterized in that, The heat insulation component is annular and is arranged circumferentially around the mounting hole. The width of the heat insulation component in the XY plane is L1, and the width of the stop portion in the XY plane is L2, satisfying 0.4≤L1 / L2≤0.

7.

3. The cell cover assembly according to claim 2, characterized in that, 1 mm ≤ L1 ≤ 1.5 mm; And / or, 2 mm ≤ L2 ≤ 3 mm.

4. The cell cover assembly according to claim 2, characterized in that, The heat insulation component is a ceramic gasket.

5. The cell cover assembly according to claim 1, characterized in that, The thickness of the heat insulation component along the Z direction is H1, and the height of the pole extending from the upper surface of the cover plate along the Z direction is H2, satisfying 0.2≤H1 / H2≤0.

4.

6. The cell cover assembly according to claim 5, characterized in that, It satisfies 0.5 mm ≤ H1 ≤ 1 mm; And / or, satisfying 2.5 mm ≤ H2 ≤ 3 mm.

7. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The thickness of the insulating component along the Z direction is H3, which satisfies 1 mm ≤ H3 ≤ 1.5 mm.

8. The cell cover assembly according to any one of claims 1 to 6, characterized in that, Along the Z direction, the bottom of the insulating member extends at least partially into the mounting hole, and the top of the insulating member extends at least partially into the side wall of the stop portion.

9. A battery cell, characterized in that, include: The housing has an opening at at least one end; The electrode assembly is installed inside the housing; The cell cover assembly according to any one of claims 1 to 8, wherein the cover is disposed over the opening and connected to the housing.

10. A battery pack, characterized in that, include: At least one battery cell as described in claim 9.

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