Battery Cells and Battery Packs

Abstract

The present invention relates to the field of battery technology, and in particular to a battery cell and a battery pack. The battery cell comprises: a first injection hole is provided in a shell; a second injection hole is provided in an insulating member, a protruding guide portion is formed on a side of the insulating member away from the first injection hole, a third injection hole is provided in the guide portion, a concave guide groove is provided on a side of the guide portion away from the first injection hole, and the guide groove extends from the hole wall of the third injection hole to the circumferential side wall of the guide portion; the groove width dimension of the guide groove is w, 0.3mm≤w≤10mm; the groove depth dimension of the guide groove is h, 0.3mm≤h≤5mm; 0.1≤w / h≤4. The present invention realizes that during injection, the electrolyte flows into the battery cell sequentially through the first injection hole, the second injection hole and the third injection hole, and the rate at which the electrolyte flows into the battery cell is accelerated under the diversion effect of the guide groove, thereby improving the production efficiency of the battery cell, ensuring smooth circulation of the electrolyte, and avoiding the situation where the electrolyte seeps out to cause battery cell pollution and the tape blocks the guide groove.

Description

Technical Field

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

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. The outer shell of the lithium-ion battery cell is provided with an injection hole for injecting electrolyte into the interior, and the battery cell is also evacuated through the injection hole to exhaust gas to ensure the injection amount of electrolyte. The tabs and connecting pieces inside the battery cell are affixed with high-temperature resistant tape, which can easily block the injection hole, thereby affecting the injection rate of the electrolyte, affecting the production efficiency of the battery cell, and even causing electrolyte leakage and contaminating the battery cell. In addition, the tape can easily close the injection hole during vacuuming, thereby affecting the normal production of the battery cell. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a battery cell and a battery pack to solve the problem of low injection flow rate in existing battery cells, easy leakage of electrolyte to contaminate the battery cells, affecting the production efficiency of the battery cells, and easy clogging of the injection holes during vacuum extraction.

[0004] A first aspect of the present invention provides a battery cell, wherein the battery cell comprises:

[0005] The housing comprises a cover plate and a shell, wherein a first liquid injection hole is provided on a side wall of the cover plate and / or the shell;

[0006] an insulating member, arranged in the shell and attached to the shell wall of the shell having the first liquid injection hole, the insulating member is provided with a second liquid injection hole, a protruding guide portion is formed on a side of the insulating member away from the first liquid injection hole, a third liquid injection hole is formed on the guide portion, a concave guide groove is formed on a side of the guide portion away from the first liquid injection hole, and the guide groove extends from the hole wall of the third liquid injection hole to the circumferential side wall of the guide portion;

[0007] The groove width dimension of the guide groove is w, 0.3mm≤w≤10mm; the groove depth dimension of the guide groove is h, 0.3mm≤h≤5mm; 0.1≤w / h≤4.

[0008] Preferably, the second injection hole and the third injection hole are coaxially arranged and have the same aperture, and the aperture size of the second injection hole is φ E, 0.1 ≤ h / φ E≤2.5.

[0009] Preferably, the minimum aperture of the first injection hole is φ D, 2mm≤ φ D≤5mm; φ D+0.5mm≤ φ E≤ φ D+5mm.

[0010] Preferably, a plurality of the guide grooves are provided, and the plurality of the guide grooves are circumferentially spaced around the third injection hole.

[0011] Preferably, w×h×n≥0.8S, wherein n is the number of the guide grooves, and S is the area of ​​the first injection hole.

[0012] Preferably, in the first direction, the minimum distance between the bottom of the guide groove and the side of the insulating member facing the housing is a, and 0.3 mm≤a≤5 mm.

[0013] Preferably, a first sinker protruding toward the interior of the battery cell is formed on the shell, and the first liquid injection hole is arranged on the first sinker; a second sinker protruding toward the interior of the battery cell is formed on the insulating member, and the second liquid injection hole and the guide portion are arranged on the second sinker, the first sinker and the second sinker are spaced apart, and the minimum spacing between the first sinker and the second sinker in the first direction is d, d≥0.3mm.

[0014] Preferably, a guide hole is provided at the bottom of the guide groove, and the guide hole connects the first liquid injection hole and the guide groove.

[0015] Preferably, the diameter of the guide hole is φ F, 0.3mm≤ φ F≤10mm.

[0016] A second aspect of the present invention provides a battery pack, comprising the battery cell described in any of the above technical solutions.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The battery cell of the present invention has a first liquid injection hole on the shell, and a second liquid injection hole on the insulating part. A protruding guide portion is formed on the side of the insulating part away from the first liquid injection hole, and a third liquid injection hole is formed on the guide portion. A recessed guide groove is formed on the side of the guide portion away from the first liquid injection hole. The guide groove extends from the hole wall of the third liquid injection hole to the side wall of the guide portion. The guide groove plays a diversion role, so that the electrolyte flows into the battery cell through the first liquid injection hole, the second liquid injection hole and the third liquid injection hole in sequence during liquid injection, and the rate at which the electrolyte flows into the battery cell is accelerated under the diversion effect of the guide groove, thereby improving the production efficiency of the battery cell. Since the guide groove extends to the side wall of the guide portion, the tape inside the battery cell is adsorbed on the surface of the insulating part during vacuuming and does not block the channel, thereby meeting the vacuuming requirements. In addition, the groove width and groove depth of the guide groove are limited to meet the following dimensional parameters: 0.3mm≤w≤10mm, 0.3mm≤h≤5mm; 0.1≤w / h≤4, to ensure smooth flow of electrolyte and avoid electrolyte leakage that causes battery cell contamination and tape clogging the guide groove.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic diagram of the structure of a battery cell provided in an embodiment of the present invention;

[0022] Figure 2 For along Figure 1 The cross-section taken at AA in the middle;

[0023] Figure 3 For along Figure 2 The cross-section taken at BB in the middle;

[0024] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at C in the middle;

[0025] Figure 5 A schematic diagram of the assembly structure of a cover plate and an insulating member in a battery cell provided in an embodiment of the present invention;

[0026] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at D in the middle;

[0027] Figure 7 A schematic diagram of the assembly structure of the cover plate and the insulating member in the battery cell provided by an embodiment of the present invention from another perspective;

[0028] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at E in the middle;

[0029] Fig. 9 A schematic diagram of the structure of an insulating member in a battery cell provided in an embodiment of the present invention;

[0030] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure at F in the middle.

[0031] Icons: 10-shell; 11-cover; 12-shell; 100-first sinker; 101-first injection hole; 20-insulating part; 200-second sinker; 201-second injection hole; 21-flow guide; 211-flow guide groove; 212-third injection hole; 213-flow guide hole; 30-pole assembly; 31-pole; 32-plastic part; 33-connector; 40-seal; 50-pole group; 60-adapter; 70-tape; D1-first 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 cell is provided, which specifically includes a housing 10 and an insulating member 20 .

[0042] Hereinafter, a specific structure of the battery cell according to this embodiment will be described.

[0043] In this embodiment, if Figures 1 to 3 As shown, the housing 10 includes a housing 12 and a cover plate 11. A first injection hole 101 is provided on the cover plate 11 and / or on the side wall of the housing 12. The first injection hole 101 is a through-hole structure penetrating the housing 10 to achieve communication between the inside and outside of the battery core. A receiving cavity for accommodating components such as the electrode group 50 is formed in the housing 12. The cover plate 11 is formed into a plate-like structure. The cover plate 11 and the housing 12 are assembled to close the receiving cavity. Figures 1 to 8 The structure in which the first liquid injection hole 101 is disposed on the cover plate 11 is shown. However, the location of the first liquid injection hole 101 is not limited thereto. The first liquid injection hole 101 may also be disposed on the housing 12 .

[0044] like Figures 1 to 3As shown, a pole assembly 30 is mounted on the housing 10, and the pole assembly 30 includes a pole 31, a plastic part 32 and a connector 33. The connector 33 is formed into a block structure and has a riveting hole. After one end of the pole 31 disposed outside the battery cell is inserted into the riveting hole, the circumferential side wall is expanded outward through a stamping process to achieve riveting connection between the pole 31 and the connector 33. In this way, the pole 31 is fixed to the housing 10, and the plastic part 32 is disposed between the housing 10 and the connector 33 to avoid short circuit caused by metal overlap. The seal 40 is formed into an annular structure to be sleeved on the circumferential side wall of part of the pole 31. The pole 31 and the connector 33 are riveted so that the seal 40 is pressed between the cover plate 11 and the bottom plate of the pole 31 to play a sealing role.

[0045] like Figure 4 As shown, the adapter 60 is formed into a sheet structure and is respectively welded to the pole ear and the pole column 31 on the pole group 50. The adapter 60 can be a connecting sheet, and the tape 70 is pasted on the surface of the pole ear and the adapter 60 facing the shell 10 to avoid slag falling from the welding mark between the adapter 60 and the pole ear or the pole ear and the shell 10 overlapping and short-circuiting.

[0046] In this embodiment, if Figures 1 to 10 As shown, the insulating member 20 is arranged in the shell 10 and is arranged on the shell wall of the shell 10 having the first injection hole 101 (the shell wall can be a cover plate or a side wall of the shell), so that the insulating member 20 is arranged in the accommodating cavity in the shell 12, and is used to separate the electrode group 50 and the shell 10 to play an insulating protection role. For example, the insulating member 20 can be attached to the side of the cover plate 11 facing the inside of the battery cell, and can also be attached to the cavity wall of the accommodating cavity. The insulating member 20 is provided with a second injection hole 201, and the first injection hole 101 and the second injection hole 201 are connected. A protruding guide portion 21 is formed on the side of the insulating member 20 away from the first injection hole 101, and a third injection hole 212 is provided on the guide portion 21, and the third injection hole 212 is connected to the second injection hole 201. The injection hole 201 is connected, and a concave guide groove 211 is formed on the side of the guide part 21 away from the first injection hole 101. The guide groove 211 extends from the hole wall of the third injection hole 212 to the side wall of the guide part 21. The guide groove 211 plays a role of diversion, so that the electrolyte flows into the battery cell through the first injection hole 101, the second injection hole 201 and the third injection hole 212 in sequence during injection, and the rate at which the electrolyte flows into the battery cell is accelerated under the diversion of the guide groove 211, thereby improving the production efficiency of the battery cell. Since the guide groove 211 extends to the side wall of the guide part 21, the tape 70 inside the battery cell is adsorbed on the surface of the insulating part 20 during vacuuming and does not block the airflow channel, thereby meeting the vacuuming requirements and ensuring smooth battery cell production. In this embodiment, the guide part 21 and the insulating part 20 are preferably formed by integral injection molding.

[0047] Preferably, the first injection hole 101, the second injection hole 201 and the third injection hole 212 are coaxially arranged so that the electrolyte directly flows into the battery cell.

[0048] In this embodiment, if Figure 4 and Figure 8 As shown, the groove width dimension of the guide groove 211 is w, 0.3mm≤w≤10mm, so as to ensure the smooth flow of electrolyte; the groove depth dimension of the guide groove 211 is h, 0.3mm≤h≤5mm, so as to avoid the tape 70 blocking the guide groove 211 due to the small dimension of h; 0.1≤w / h≤4, so as to limit the dimensional ratio relationship between the groove width and the groove depth of the guide groove 211, and avoid the tape 70 blocking the guide groove 211 due to the excessive dimensional ratio.

[0049] In this embodiment, if Figures 6 to 10 As shown, the second injection hole 201 and the third injection hole 212 are coaxially arranged and have the same aperture. The aperture size of the second injection hole 201 and the third injection hole 212 is ∅E, 0.1≤h / φ E≤2.5, thus limiting the size ratio between the depth of the guide groove 211 and the apertures of the second injection hole 201 and the third injection hole 212, achieving effective diversion of the guide groove 211, ensuring the flow rate of the electrolyte during injection, and preventing the tape 70 from clogging the second injection hole 201 and the third injection hole 212.

[0050] In this embodiment, if Figure 4 and Figure 8 As shown, the end of the first injection hole 101 facing the outside of the battery cell is formed into a trumpet-shaped expansion structure to facilitate the connection of the injection device or the vacuum device. The minimum aperture of the first injection hole 101 is φ D, 2mm≤ φ D≤5mm, preferably, φ D = 3mm, to ensure sufficient liquid flow area; φ D+0.5mm≤ φ E≤ φ D+5mm, so that the apertures of the second injection hole 201 and the third injection hole 212 are larger than the aperture of the first injection hole 101, ensuring that the electrolyte flows smoothly from the first injection hole 101 to the second injection hole 201 and the third injection hole 212, and also facilitating the installation of the rubber plug after injection and vacuuming.

[0051] In a preferred embodiment, Figures 5 to 10 As shown, there are multiple guide grooves 211, and the multiple guide grooves 211 are arranged at intervals around the third injection hole 212, which improves the diversion effect of the guide grooves 211 on the electrolyte and further accelerates the injection rate of the electrolyte. In other optional embodiments, the number of guide grooves 211 can also be set to one.

[0052] Further, in this embodiment, w×h×n≥0.8S, where n is the number of guide grooves 211, S is the area of ​​the first injection hole 101, and S= , thus ensuring the injection rate and avoiding electrolyte leakage during the injection process.

[0053] In this embodiment, if Figure 4 As shown, the minimum distance between the bottom of the guide groove 211 in the first direction D1 and the side of the insulating part 20 facing the housing 10 is a, 0.3mm≤a≤5mm, which ensures that the insulating part 20 has sufficient structural strength and facilitates injection molding of the insulating part 20. In this embodiment, the first direction is the axial direction of the second injection hole 201, and a can be understood as the depth of the following guide hole 213.

[0054] In this embodiment, if Figure 4 As shown, a first sinker 100 protruding toward the interior of the battery cell is formed on the shell 10, and a first liquid injection hole 101 is arranged on the first sinker 100. The first sinker 100 can be formed by a stamping process; a second sinker 200 protruding toward the interior of the battery cell is formed on the insulating part 20, and the second liquid injection hole 201 and the guide part 21 are arranged on the second sinker 200. The first sinker 100 and the second sinker 200 are spaced apart in the first direction D1, and the minimum spacing between the first sinker 100 and the second sinker 200 in the first direction D1 is d, and d≥0.3mm, so as to facilitate the circulation of electrolyte and avoid interference during assembly.

[0055] In a preferred embodiment, Figures 4 to 10 As shown, a guide hole 213 is provided at the bottom of the guide groove 211, and the guide hole 213 is formed into a through-hole structure. The guide hole 213 connects the first injection hole 101 and the guide groove 211, so that the electrolyte entering the battery cell from the first injection hole 101 can flow to the guide groove 211 through the guide hole 213 in addition to flowing to the second injection hole 201, thereby further improving the injection rate, ensuring that there will be no electrolyte leakage during rapid injection and vacuuming. The guide hole 213 is arranged on the side of the second injection hole 201 in the radial direction. The number of guide holes 213 is m, m ≥ 0, and when the number m is greater than 1, multiple guide holes 213 are arranged at equal intervals around the axial direction of the second injection hole 201 to achieve uniform distribution of the electrolyte and improve the injection efficiency.

[0056] Furthermore, in this embodiment, if Figure 8 As shown, the diameter of the guide hole 213 is φ F, 0.3mm≤ φF≤10mm, so as to avoid the small aperture affecting the smooth flow of electrolyte, and will not damage the structure of the insulating member 20 and affect the structural strength. In this embodiment, the guide hole 213 is a circular hole, but the shape of the guide hole 213 is not limited to this, and can also be a square hole, a triangular hole or a diamond hole. When the guide hole 213 is not a circular hole structure, φ F is the minimum aperture.

[0057] The following are different φ D. φ The production line production status of battery cells of sizes E, h, w and S is tested, and the test results are shown in Table 1 below.

[0058] Table 1

[0059]

[0060] Note: The failure mode “ / ” in the table indicates that the battery cell production is normal, and there is no abnormal vacuuming or difficulty in filling.

[0061] As shown in Table 1, in Examples 1 to 6, all parameters are within the specified range, and no vacuum abnormality or injection difficulty occurs during the production of the battery cell production line; however, in Comparative Example 1, blockage occurs during vacuuming of the battery cell, and the vacuum abnormality is mainly due to h / φ The reason is that the parameter E is too small. In Comparative Example 2, blockage occurs when vacuuming the battery cell. The abnormal vacuuming is mainly caused by the excessive size of w / h. In Comparative Example 3, difficulty in liquid injection is mainly caused by the excessively small size of w×h×n. In Comparative Example 4, blockage occurs when vacuuming the battery cell. The abnormal vacuuming is mainly caused by the excessively small size of h. In Comparative Example 5, difficulty in liquid injection is mainly caused by the excessively small size of w.

[0062] According to a battery cell provided by the present invention, a first liquid injection hole is provided on a shell, a second liquid injection hole is provided on an insulating member, a protruding guide portion is formed on a side of the insulating member away from a surface of the shell where the first liquid injection hole is provided, a third liquid injection hole is provided on the guide portion, a recessed guide groove is formed on a side of the guide portion away from the shell, the guide groove extends from the hole wall of the third liquid injection hole to the side wall of the guide portion, the guide groove plays a role of diversion, so that during liquid injection, the electrolyte flows into the battery cell through the first liquid injection hole, the second liquid injection hole and the third liquid injection hole in sequence, and the rate at which the electrolyte flows into the battery cell is accelerated under the diversion effect of the guide groove, thereby improving the production efficiency of the battery cell, and because the guide groove extends to the side wall of the guide portion, the tape inside the battery cell is adsorbed on the surface of the insulating member during vacuuming and does not block the channel, thereby meeting the vacuuming requirement. In addition, the groove width and groove depth parameters of the guide groove are limited to meet the following requirements: 0.3mm≤w≤10mm, 0.3mm≤h≤5mm; 0.1≤w / h≤4, to ensure smooth flow of electrolyte, avoid electrolyte leakage and contamination of the battery cell, and avoid clogging of the guide groove with tape.

[0063] A battery pack provided according to the present invention includes the battery cell as described above, wherein at least one battery cell is provided. When multiple battery cells are provided, at least some of the battery cells are connected in series and / or in parallel. The production efficiency and performance of each battery cell can be guaranteed, thereby effectively improving the production efficiency and safety of the battery pack.

[0064] 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, characterized in that: The battery cell comprises: The housing comprises a cover plate and a shell, wherein a first liquid injection hole is provided on a side wall of the cover plate and / or the shell; an insulating member, arranged in the shell and attached to the shell wall of the shell having the first liquid injection hole, the insulating member is provided with a second liquid injection hole, a protruding guide portion is formed on a side of the insulating member away from the first liquid injection hole, a third liquid injection hole is formed on the guide portion, a concave guide groove is formed on a side of the guide portion away from the first liquid injection hole, and the guide groove extends from the hole wall of the third liquid injection hole to the circumferential side wall of the guide portion; The groove width dimension of the guide groove is w, 0.3mm≤w≤10mm; the groove depth dimension of the guide groove is h, 0.3mm≤h≤5mm; 0.1≤w / h≤4.

2. The battery cell according to claim 1, characterized in that: The second injection hole and the third injection hole are coaxially arranged and have the same aperture. The aperture size of the second injection hole is φ E, 0.1 ≤ h / φ E≤2.

5.

3. The battery cell according to claim 2, characterized in that: The minimum aperture of the first injection hole is φ D, 2mm≤ φ D≤5mm; φ D+0.5mm≤ φ E≤ φ D+5mm.

4. The battery cell according to claim 1, characterized in that: A plurality of guide grooves are provided, and the plurality of guide grooves are arranged at intervals in the circumferential direction around the third liquid injection hole.

5. The battery cell according to claim 1 or 4, characterized in that: w×h×n≥0.8S, wherein n is the number of the guide grooves, and S is the area of ​​the first injection hole.

6. The battery cell according to claim 1, characterized in that: In the first direction, the minimum distance between the bottom of the guide groove and the side of the insulating member facing the housing is a, and 0.3 mm≤a≤5 mm.

7. The battery cell according to claim 1, characterized in that: A first sinker protruding toward the interior of the battery cell is formed on the shell, and the first liquid injection hole is arranged on the first sinker; a second sinker protruding toward the interior of the battery cell is formed on the insulating member, and the second liquid injection hole and the guide portion are arranged on the second sinker, the first sinker and the second sinker are spaced apart, and the minimum spacing between the first sinker and the second sinker in the first direction is d, d≥0.3mm.

8. The battery cell according to claim 1, characterized in that: A guide hole is formed at the bottom of the guide groove, and the guide hole is connected with the first liquid injection hole and the guide groove.

9. The battery cell according to claim 8, characterized in that: The diameter of the guide hole is φ F, 0.3mm≤ φ F≤10mm.

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

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