Battery cell insulation structure and battery cell

Abstract

The present invention relates to the field of battery technology, and in particular to a battery cell insulation structure and a battery cell. The battery cell insulation structure comprises: an insulating member is provided with a mounting hole for accommodating a pole ear portion on a pole group, and a support portion is formed in the mounting hole and is arranged perpendicularly to the axis of the mounting hole; the size of the insulating member in the first direction is T, 2mm≤T≤10mm; the distance between the end of the mounting hole facing the inside of the battery cell and the support portion in the first direction is T1, and the size of the support portion in the first direction is T2; 0.8mm≤T1≤0.75T, and / or 0.5mm≤T2≤0.5T. The present invention can effectively support the shape of the folded pole ear portion, avoid the situation where the pole ear portion is inserted into the pole group invertedly to cause a short circuit, and avoid the situation where the volume energy sealing of the battery cell is reduced due to the excessive thickness of the insulating member, thereby ensuring reliable assembly of the pole group and the insulating member.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell insulation structure and a battery cell. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, power batteries are widely used in electric vehicles as a new type of battery, and the performance and safety requirements of power batteries are increasing.

[0003] The battery includes a shell, a cover plate, a pole group and a plastic part. The pole group is arranged inside the shell and is usually formed by stacking or winding pole pieces. To ensure that the battery impedance is small, the pole ear part of the pole group is designed as a multi-pole ear structure. The multi-layer pole ears are gathered together and connected to the cover plate assembly through a welding process. After the cover plate is connected to the pole group, the pole ear part needs to be bent relative to the cover plate to facilitate the assembly of the pole group into the shell. The plastic part is arranged on the side of the cover plate facing the inside of the shell to play an insulating role. The pole ear part needs to pass through the plastic part to connect with the pole column on the cover plate. Improper assembly of the plastic part and the pole ear can easily cause the pole ear to be unable to fold and close or the shape of the pole ear after folding cannot be supported, resulting in the pole piece being crushed, and even the pole ear part being inverted into the pole group to cause a short circuit, affecting the safety performance of the battery cell, or to avoid the problem of inverted insertion of the pole ear part, the installation space of the pole ear part in the shell is increased, resulting in a decrease in the volume energy density of the battery cell. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a battery cell insulation structure and a battery cell to solve the problem that improper assembly of existing plastic parts and pole ears may easily cause the pole ears to be unable to fold and close or the shape of the pole ears after folding cannot be supported, resulting in the pole sheets being crushed, and even causing the pole ears to be invertedly inserted into the pole group, causing a short circuit, affecting the safety performance of the battery cell, or to avoid the problem of inverted insertion of the pole ears, increasing the installation space of the pole ears in the shell, resulting in a decrease in the volume energy density of the battery cell.

[0005] A first aspect of the present invention provides a battery cell insulation structure, wherein the battery cell insulation structure comprises:

[0006] An insulating member is provided with a mounting hole for receiving the pole ear portion on the pole group, and a support portion is formed in the mounting hole and is arranged perpendicular to the axis of the mounting hole; the size of the insulating member in the first direction is T, 2mm≤T≤10mm; the distance between the end of the mounting hole facing the inside of the battery cell and the support portion in the first direction is T1, and the size of the support portion in the first direction is T2;

[0007] 0.8mm≤T1≤0.75T, and / or 0.5mm≤T2≤0.5T.

[0008] Preferably, the support portion is formed as a plate-shaped structure, and a first through hole extending along the second direction is formed on the support portion for the pole ear portion to pass through.

[0009] Preferably, the pole lug portion includes multiple layers of pole lugs that are folded and connected, and the thickness of each layer of the pole lug is N, in mm; the pole lug is provided with M layers;

[0010] The dimension of the insulating member in the third direction is A, the dimension of the first through hole in the third direction is A1, and N×M×2≤A1≤0.75A.

[0011] Preferably, the length dimension of the first through hole in the second direction is B1, the length dimension of the pole ear portion in the second direction is B2, and 50%≤B2 / B1≤95%.

[0012] Preferably, the mounting hole is formed as a stepped through-hole structure, the support portion is arranged at the step of the mounting hole, and a protruding first reinforcement portion is formed on a side of the support portion facing the outside of the battery core.

[0013] Preferably, a second through hole is provided on the insulating member for connecting the pressure relief member and the interior of the battery cell; a protruding second reinforcement portion is formed on the hole wall of the second through hole, and the distance between the side of the second reinforcement portion facing the pressure relief member and the surface of the insulating member facing the outside of the battery cell is L, and L≥0.2mm.

[0014] Preferably, a liquid injection channel is provided on the insulating member, and the liquid injection channel is communicated with the interior of the battery cell and the liquid injection port on the battery cell respectively.

[0015] Preferably, a buffer portion is provided inside the injection channel, and along the direction of electrolyte injection into the battery cell, the buffer portion is provided below the injection port, and a third through hole is provided on the outer edge of the buffer portion so that the electrolyte infiltrates the electrode group through the third through hole.

[0016] Preferably, a partition surface is formed on the insulating member, so that the insulating member is formed into a split structure, and the partition surface passes through the first through hole.

[0017] A second aspect of the present invention provides a battery cell, comprising the battery cell insulation structure described in any of the above technical solutions.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The insulating member of the cell insulation structure of the present invention is provided with a mounting hole for receiving the pole ear portion on the pole group, and a support portion is formed in the mounting hole and is arranged perpendicular to the axis of the mounting hole for supporting the pole ear portion; the size of the insulating member in the first direction is T, 2mm≤T≤10mm, so that sufficient folding space for the pole ear portion is reserved to ensure smooth folding of the pole ear portion, and to avoid the problem of occupying the cell volume due to the excessive size of T, resulting in reduced energy density; the distance between the end of the mounting hole facing the inside of the cell and the support portion in the first direction is T1, 0.8mm≤T1≤0. 75T, which can avoid the electrode sheet from being crushed, ensure the smooth folding of the electrode ear, and avoid the reduction of the energy density of the battery cell due to the excessive size of T1; the size of the support part in the first direction is T2, 0.5mm≤T2≤0.5T, so that the support part can effectively support the shape of the folded electrode ear, give the electrode ear sufficient supporting strength, avoid the short circuit caused by the inverted insertion of the electrode group, and avoid the reduction of the volume energy sealing of the battery cell due to the excessive thickness of the insulating part, thereby ensuring the reliable assembly of the electrode group and the insulating part and improving the safety and yield rate of the battery cell.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of a battery core insulation structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a battery cell insulation structure provided by an embodiment of the present invention from another perspective;

[0024] Figure 3 for Figure 2 A cross-sectional view taken along line BB;

[0025] Figure 4 A structural cross-sectional view of a battery core insulation structure provided by an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the structure of a pole group assembled with a cell insulation structure provided in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the position of the separation surface in the battery core insulation structure provided by an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the position of another structure of a separation surface in a battery core insulation structure provided by an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the structure of a battery cell provided in an embodiment of the present invention;

[0030] Fig. 9 for Figure 8 Cross-sectional view taken along CC.

[0031] Icons: 10-insulating part; 11-mounting hole; 12-supporting part; 121-first through hole; 13-first reinforcement part; 14-second through hole; 141-second reinforcement part; 15-injection channel; 151-buffer part; 152-third through hole; 16-partitioning surface; 20-pole group; 21-pole ear part; 30-housing; 40-seal; D1-first direction; D2-second direction; D3-third direction. DETAILED DESCRIPTION

[0032] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0033] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0034] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0035] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0036] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0037] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0038] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0039] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0040] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0041] According to a first aspect of the present invention, a battery core insulation structure is provided, which specifically includes an insulating member 10 .

[0042] Hereinafter, the specific structure of the cell insulation structure according to the present embodiment as described above will be described.

[0043] In this embodiment, if Figures 1 to 3 , Figure 5 and Figure 6 As shown, the insulating member 10 is arranged on the side of the battery core facing the inside of the battery core, and a mounting hole 11 is provided on the insulating member 10 for receiving the pole ear portion 21 on the pole group 20. Figure 3 and Figure 4 The portion surrounded by the dotted line is the structure of the mounting hole 11 (it should be noted that Figure 3 and Figure 4The dotted box in the figure is only used to indicate the area, and the dotted box does not belong to the structure of the insulating member 10 itself). A support portion 12 is formed in the mounting hole 11 and is arranged perpendicular to the axis of the mounting hole 11, so as to support the pole ear portion 21. The dimension of the insulating member 10 in the first direction D1 is T, 2mm≤T≤10mm, so that sufficient folding space for the pole ear portion 21 is reserved to ensure smooth folding of the pole ear portion 21, and the problem of reducing the energy density due to the excessive size of T occupying the volume of the battery cell can be avoided. In the first direction D1, the distance between the end of the mounting hole 11 facing the inside of the battery cell and the side of the support portion 12 facing the inside of the battery cell is T1. , the unit is mm, 0.8mm≤T1≤0.75T, so as to ensure that the pole ear is smoothly folded, avoid the pole piece from being crushed, and avoid the reduction of the energy density of the battery cell due to the excessive size of T1; the size of the support portion 12 in the first direction D1 is T2, the unit is mm, 0.5mm≤T2≤0.5T, so that the support portion 12 can effectively support the shape of the folded pole ear portion 21, avoid the situation that the pole ear portion 21 is invertedly inserted into the pole group 20 to cause a short circuit, and avoid the situation that the volume energy sealing of the battery cell is reduced due to the excessive thickness of the insulating member 10, so as to ensure the reliable assembly of the pole group 20 and the insulating member 10.

[0044] It should be noted that the pole ear 21 at one end of the pole group 20 can be provided with one or more pole ears, and the mounting holes 11 can be provided one by one corresponding to the pole ears 21. The pole ears 21 can be positive pole ears or negative pole ears.

[0045] In this embodiment, the pole group 20 is formed by winding or stacking pole sheets, and a protruding pole ear is formed at the end of the pole sheet. The pole ear portion 21 includes a plurality of layers of pole ears that are gathered together and connected. The gathering and connection is to gather the plurality of layers of scattered pole ears at the end of the pole group 20 together to form a whole for easy connection. The thickness of each layer of pole ears is N, in mm, and the pole ears are provided with M layers.

[0046] Next, the insulation structures of the cells of different sizes are assembled with the pole group 20 to check the situation of the pole ear being gathered during the assembly process and whether the pole ear portion 21 is inserted upside down into the pole group 20, so as to verify whether the limiting conditions of 2mm≤T≤10mm, 0.8mm≤T1≤0.75T and 0.5mm≤T2≤0.5T can ensure the assembly reliability of the pole group 20. The test results are shown in the following table:

[0047]

[0048] As can be seen from the above table, in Examples 2, 4 to 8, 10 to 12, and 14 to 19, the three limiting conditions mentioned above are all met, the pole ears can be smoothly retracted without causing damage to the pole sheets, and after the pole group 20 is inserted into the shell, the pole ear portion 21 will not be inserted upside down into the pole group 20, thereby avoiding the risk of short circuit, ensuring reliable assembly of the pole group 20, and improving the safety performance of the battery cell.

[0049] Optionally, the insulating member 10 is formed into a rectangular plate-like structure, the first direction D1 described below may be the thickness direction of the insulating member 10, the second direction D2 may be the length direction of the insulating member 10, and the third direction D3 may be the width direction of the insulating member 10. The first direction D1, the second direction D2, and the third direction D3 are arranged perpendicularly to each other.

[0050] Furthermore, in this embodiment, if Figures 1 to 5 As shown, the support portion 12 is formed into a plate-like structure, preferably, the support portion 12 is formed into a plate-like structure perpendicular to the axis of the mounting hole 11, and a first through hole 121 extending along the second direction D2 is provided on the support portion 12 for the pole ear portion 21 to pass through. The first through hole 121 can be formed into a rectangular long strip through hole structure.

[0051] Preferably, if Figure 2 As shown, the dimension of the insulating part 10 in the third direction D3 is A, in mm, and the dimension of the first through hole 121 in the third direction D3 is A1, in mm, N×M×2≤A1≤0.75A. This can avoid the situation where the first through hole 121 is too small, resulting in the pole ear 21 being unable to pass through, and can also avoid the situation where the first through hole 121 is too large, resulting in the pole ear 21 being easily inserted into the pole group 20.

[0052] In this embodiment, if Figure 2 Shown and Figure 5 As shown, the length dimension of the first through hole 121 in the second direction D2 is B1, in mm; the maximum length dimension of the pole ear portion 21 in the second direction D2 is B2, in mm, 50%≤B2 / B1≤95%, so as to avoid the ratio being too large to cause the assembly to fail or the ratio being too small to cause the length space to be insufficient. It should be noted that when there are multiple mounting holes 11, the ratio between the length dimension of any pole ear portion 21 in the second direction D2 and the length dimension of any first through hole 121 in the second direction D2 is within the range of 50%~95%, which can ensure smooth assembly.

[0053] In this embodiment, if Figures 1 to 4As shown, the mounting hole 11 is formed as a stepped through-hole structure, and the support portion 12 is arranged at the step of the mounting hole 11. For example, the mounting hole 11 is a countersunk hole, and the support portion 12 can be installed under the sink. A protruding first reinforcement portion 13 is formed on the side of the support portion 12 facing the outside of the battery cell, so that the insulation performance can be increased after the support portion 12 is assembled with the shell or the cover plate. The first reinforcement portion 13 can be formed as an annular structure, such as a rectangular or circular annular structure.

[0054] like Figures 1 to 4 As shown, a second through hole 14 is provided on the insulating member 10 for connecting the pressure relief member and the inside of the battery cell, so that the gas can be discharged smoothly after the pressure relief member is opened. The pressure relief member can be a structure such as an explosion-proof valve or an explosion-proof notch; a second reinforcement portion 141 is provided in the second through hole 14, and the second reinforcement portion 141 can be formed into a convex rib structure in the shape of a cross or a cross, so as to improve the rigidity of the second through hole 14, and the distance between the side of the second reinforcement portion 141 facing the pressure relief member and the surface of the insulating member 10 facing the outside of the battery cell is L, L≥0.2mm, so as to avoid the second reinforcement portion 141 from causing damage to the pressure relief member.

[0055] In addition, the insulating member 10 is provided with a liquid injection channel 15, which is connected to the interior of the battery cell and the liquid injection port on the battery cell respectively, so that after the battery cell is assembled, the electrolyte can be injected into the battery cell through the liquid injection port from the outside of the battery cell.

[0056] In a preferred embodiment, Figures 1 to 4 As shown, a buffer portion 151 is provided inside the injection channel 15. The buffer portion 151 can be formed into a sheet-like or plate-like structure. Along the first direction D1, that is, along the direction of the electrolyte being injected into the battery cell, the buffer portion 151 is provided below the injection port. The buffer portion 151 is preferably provided directly below the injection port, so that the buffer portion 151 can buffer the impact of the electrolyte on the electrode sheet. A third through hole 152 is provided on the outer edge of the buffer portion 151. The electrolyte infiltrates the electrode group 20 through the third through hole 152, so that the flow path of the electrolyte in the injection channel 15 is tortuous, effectively avoiding damage to the electrode sheet. Preferably, a plurality of third through holes 152 are provided, and the plurality of third through holes 152 are arranged at intervals around the edge of the buffer portion 151, so as to form a plurality of branch channels, thereby further effectively mitigating the impact of the electrolyte on the electrode group 20.

[0057] In this embodiment, if Figure 6 and Figure 7The insulating member 10 shown in the figure is formed with a partition surface 16, so that the insulating member 10 is formed into a split structure, that is, the insulating member 10 is formed by splicing a plurality of components, and the splicing method can be snap connection, interference fit connection, hot melt connection or bonding, etc. The partition surface 16 passes through the first through hole 121, so that the first through hole 121 is surrounded by at least two components, which facilitates the assembly of the insulating member 10 and the pole ear portion 21. It should be noted that the partition surface 16 can be formed as shown in the figure. Figure 6 The planar structure shown can also be formed as Figure 7 The bent structure shown.

[0058] According to a battery cell insulation structure provided by the present invention, a mounting hole is provided on the insulating member for receiving the pole ear portion on the pole group, and a support portion is formed in the mounting hole and is arranged perpendicular to the axis of the mounting hole for supporting the pole ear portion; the size of the insulating member in the first direction is T, 2mm≤T≤10mm, so that sufficient folding space for the pole ear portion is reserved to ensure smooth folding of the pole ear portion, and to avoid the problem of occupying the battery cell volume due to the excessive size of T and resulting in reduced energy density; the distance between the end of the mounting hole facing the inside of the battery cell and the support portion in the first direction is T1, 0. 8mm≤T1≤0.75T, which can prevent the pole piece from being crushed, ensure the smooth folding of the pole ear, and prevent the energy density of the battery cell from being reduced due to the excessive size of T1; the size of the support part in the first direction is T2, 0.5mm≤T2≤0.5T, so that the support part can effectively support the shape of the folded pole ear, give the pole ear sufficient supporting strength, avoid the short circuit caused by the pole ear being inserted into the pole group, and avoid the reduction of the volume energy sealing of the battery cell due to the excessive thickness of the insulating part, thereby ensuring the reliable assembly of the pole group and the insulating part.

[0059] A second aspect of the present invention provides a battery cell, comprising the battery cell insulation structure as described above, a shell 30 and a seal 40 .

[0060] In this embodiment, if Figure 8 and Fig. 9 As shown, the insulating member 10 is installed on the inner surface of the shell 30, part of the shell 30 is embedded in the side of the mounting hole facing the shell 30, and the first reinforcement portion abuts against part of the hole wall of the shell where the pole is installed; the sealing member 40 is formed into an annular structure and is arranged at the connection between the insulating member 10 and the shell 30 to ensure the sealing of the assembly of the insulating member 10 and the shell 30, and the sealing member 40 can adopt an elastic sealing ring.

[0061] A battery cell provided according to the present invention has all the beneficial effects of the battery cell insulation structure described above, and can effectively improve the safety and yield rate of the battery cell.

[0062] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cell insulation structure, characterized in that: The battery core insulation structure comprises: An insulating member is provided with a mounting hole for receiving a pole ear portion on a pole group, and a support portion is formed in the mounting hole and is arranged perpendicularly to the axis of the mounting hole; the dimension of the insulating member in the first direction is T, 2mm≤T≤10mm; the distance between the end of the mounting hole facing the inside of the battery cell and the support portion in the first direction is T1, and the dimension of the support portion in the first direction is T2; 0.8mm≤T1≤0.75T, and / or 0.5mm≤T2≤0.5T; a first through hole extending along the second direction is provided on the support portion for the pole ear portion to pass through; The pole ear portion includes a plurality of layers of pole ears that are folded and connected, and the thickness dimension of each layer of the pole ears is N, in mm; the pole ears are provided with M layers; the dimension of the insulating member in the third direction is A, and the dimension of the first through hole in the third direction is A1, N×M×2≤A1≤0.75A.

2. The battery core insulation structure according to claim 1, characterized in that: The support portion is formed as a plate-like structure.

3. The battery core insulation structure according to claim 2, characterized in that: The length dimension of the first through hole in the second direction is B1, the maximum length dimension of the pole ear portion in the second direction is B2, and 50%≤B2 / B1≤95%.

4. The battery core insulation structure according to claim 1, characterized in that: The mounting hole is formed as a stepped through-hole structure, the support portion is arranged at the step of the mounting hole, and a protruding first reinforcement portion is formed on a side of the support portion facing the outside of the battery core.

5. The battery core insulation structure according to claim 1, characterized in that: A second through hole is provided on the insulating member for connecting the pressure relief member and the interior of the battery cell; a second reinforcement portion is provided in the second through hole, and the distance between the side of the second reinforcement portion facing the pressure relief member and the surface of the insulating member facing the outside of the battery cell is L, and L≥0.2mm.

6. The battery core insulation structure according to claim 1, characterized in that: The insulating member is provided with a liquid injection channel, and the liquid injection channel is communicated with the interior of the battery core and the liquid injection port on the battery core respectively.

7. The battery cell insulation structure according to claim 6, characterized in that: A buffer portion is provided inside the injection channel. Along the first direction, the buffer portion is provided below the injection port. A third through hole is provided at the outer edge of the buffer portion so that the electrolyte can infiltrate the electrode group through the third through hole.

8. The battery core insulation structure according to claim 2, characterized in that: A partition surface is formed on the insulating member, so that the insulating member is formed into a split structure, and the partition surface passes through the first through hole.

9. A battery cell, characterized in that: The invention comprises a battery core insulation structure as described in any one of claims 1 to 8.

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