Battery cell cover plate and battery cell

Abstract

The application relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises: a cover plate body provided with a liquid injection hole; a first insulating piece arranged in the battery cell, the first insulating piece being provided with a recessed first cavity on the side facing the cover plate body, and the projection of the first cavity on the cover plate body covering the liquid injection hole; the side of the first insulating piece facing the battery cell is provided with a boss abutting against a pole group, the boss is provided with a drainage channel communicating with the first cavity and the pole group, the flow path of the fluid in the drainage channel is arranged at an angle with the axial direction of the liquid injection hole at least partially, and a through portion is arranged in the side wall of the boss and communicates with the drainage channel. According to the application, the situation that the diaphragm in the pole group blocks the drainage channel when liquid injection or exhaust is performed through the liquid injection hole can be improved, the electrolyte can flow smoothly, the electrolyte injection efficiency is improved, the liquid injection time is reduced, the risk of electrolyte overflow is reduced, and the stability of gas exhaust through the liquid injection hole in time is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a cell cover plate and a cell. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety. The lithium battery cover is a key component of a lithium-ion battery, serving to form a sealed cavity when welded to the casing, to lead out the positive and negative electrodes, and to act as an assembly carrier.

[0003] Currently, the cover plate mainly consists of a top cover plate, upper plastic, riveting block, electrode post, lower plastic, and sealing ring. The upper surface of the lower plastic is connected to the top cover plate, and the lower surface abuts against the electrode assembly, thereby limiting the electrode assembly. The top cover plate is provided with an injection hole for injecting electrolyte. In order to allow the electrolyte to flow to the electrode assembly, the lower plastic has a dispersion hole at the position corresponding to the injection hole. Because the dispersion hole is located against the electrode assembly, the diaphragm in the electrode assembly is prone to sticking to the dispersion hole of the lower plastic during negative pressure vacuuming, thus blocking the dispersion hole. This makes it difficult for the electrolyte to pass through the dispersion hole, resulting in reduced electrolyte injection efficiency, increased injection time, and a greater risk of electrolyte overflow. At the same time, during the high-temperature baking and pre-charging process of the battery cell, the internal gas pressure of the battery cell will also increase, causing the dispersion hole to be blocked by the diaphragm. The gas cannot be discharged through the injection hole in time, causing the battery cell to swell, resulting in performance and safety abnormalities. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a cell cover and a cell to solve the problems of existing cell cover where the location of the dispersion hole on the lower plastic corresponds to the opening position of the injection hole and abuts against the electrode assembly, making it easy for the diaphragm in the electrode assembly to block the dispersion hole, resulting in reduced electrolyte injection efficiency, increased injection time, and a greater risk of electrolyte overflow; and the problem of performance and safety abnormalities caused by increased internal gas pressure in the cell during high-temperature baking and pre-charging processes, where gas cannot be discharged in time through the injection hole.

[0005] A first aspect of the present invention provides a battery cell cover plate, comprising:

[0006] The cover plate body has an injection hole;

[0007] The first insulating element is disposed on the side of the cover plate body facing the inside of the battery cell;

[0008] The first insulating member has a recessed first cavity on the side facing the cover plate body, and the projection of the first cavity on the cover plate body covers the liquid injection hole; the first insulating member has a boss that abuts against the electrode group on the side facing the inside of the cell, and a drainage channel connecting the first cavity and the electrode group is provided on the boss, and the flow path of the fluid in the drainage channel is at least partially angled to the axis of the liquid injection hole.

[0009] The through-hole is formed on the side wall of the boss and communicates with the drainage channel.

[0010] Preferably, the first insulating member has a recessed second cavity formed on the side facing the cover plate body, the bottom of the second cavity has a connecting hole, and the through portion is formed on the side of the second cavity; a partition is provided between the second cavity and the first cavity, and a connecting portion connecting the first cavity and the second cavity is provided on the partition, the connecting portion, the second cavity and the connecting hole form the drainage channel.

[0011] Preferably, the connecting portion is formed as a groove structure that is recessed inward from the side of the first insulating member facing the cover plate body;

[0012] And / or, the connecting parts are provided in multiples, and the multiple connecting parts are arranged at intervals on the partition.

[0013] Preferably, in the first direction, the partition is inclined on the side facing the second cavity.

[0014] Preferably, the interconnecting area of ​​the injection hole is S1, in mm. 2 The sum of the cross-sectional areas of all the connecting parts perpendicular to the first direction is S2, in mm. 2 S2≥S1.

[0015] Preferably, the cross-section of the connecting portion perpendicular to the first direction is formed as a rectangle, the dimension of the rectangle in the thickness direction of the cover plate body is h, in mm; the dimension of the rectangle in the second direction is m, in mm; the number of connecting portions is n; S2 = n × h × m.

[0016] Preferably, on the first insulating member, the first cavity and the boss are arranged along a first direction; the cover plate body is formed as a plate structure, and the first direction is parallel to the cover plate body.

[0017] Preferably, the first insulating member is formed as a strip structure, the boss is disposed at one end of the first insulating member in the length direction, the first insulating member has a first mounting hole for the electrode post to pass through, and the first cavity is disposed between the first mounting hole and the boss.

[0018] Preferably, along the flow direction of the fluid in the drainage channel, one end of the drainage channel leads to the side of the boss facing the electrode assembly, and the other end of the drainage channel leads to the sidewall of the first cavity.

[0019] A second aspect of the present invention provides a battery cell, including the battery cell cover plate described in any of the above technical solutions.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In the battery cell cover of the present invention, a liquid injection hole is provided on the main body of the cover plate; a first insulating member is provided on the side of the main body of the cover plate facing the inside of the battery cell; a recessed first cavity is formed on the side of the first insulating member facing the main body of the cover plate, and the projection of the first cavity on the main body of the cover plate covers the liquid injection hole; a boss is provided on the side of the first insulating member facing the inside of the battery cell, which abuts against the electrode assembly; a drainage channel connecting the first cavity and the electrode assembly is provided on the boss; a through portion is provided on the side wall of the boss and communicates with the drainage channel; the flow path of the fluid in the drainage channel is at least partially angled to the axial direction of the liquid injection hole, so that a tortuous communication path is formed between the electrode assembly and the outside of the battery cell, thereby improving the situation where the diaphragm in the electrode assembly blocks the drainage channel; the setting of the through portion ensures smooth electrolyte inflow, thereby improving the efficiency of electrolyte injection, reducing the injection time and the risk of electrolyte overflow, and improving the stability of timely gas discharge through the liquid injection hole during the high-temperature baking and pre-charging process of the battery cell, avoiding battery cell swelling, thereby ensuring battery cell performance and safety performance.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is an exploded structural diagram of the battery cell cover plate provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the battery cell cover plate provided in an embodiment of the present invention from another perspective;

[0027] Figure 4 For along Figure 3 Cross-sectional view taken at point AA in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of the first insulating element in the battery cell cover provided in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the structure of the first insulating element in the cell cover plate provided in an embodiment of the present invention from another perspective;

[0030] Figure 7 For along Figure 6 Cross-sectional view taken at point BB.

[0031] Icons: 10-Cover plate body; 11-Injection hole; 12-Assembly hole; 20-First insulating component; 21-First cavity; 22-Boss; 23-Drainage channel; 24-Second cavity; 25-Connecting hole; 26-Partition; 27-Connecting part; 28-First mounting hole; 30-Second insulating component; 31-Second mounting hole; 40-Connecting component; 41-Connecting hole; 50-Sealing component; 60-Pole post; 70-Through part; D1-First direction; D2-Second direction. Detailed Implementation

[0032] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for 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 construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

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

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

[0036] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0037] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that 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 relation terms used herein will be interpreted accordingly.

[0038] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0039] Variations in the shapes shown in the accompanying 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 accompanying drawings, but include changes in shape that may occur during manufacturing.

[0040] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0041] According to a first aspect of the present invention, a cell cover plate is provided, which includes a cover plate body 10, a first insulating member 20, and a through portion 70.

[0042] The specific structure of the above-described components of the cell cover plate according to this embodiment will be described below.

[0043] In this embodiment, as Figures 1 to 4 As shown, the cover plate body 10 is provided with a liquid injection hole 11. The cover plate body 10 is formed into a plate-shaped structure. The liquid injection hole 11 is a through hole that penetrates the cover plate body 10. The first insulating member 20 is disposed inside the battery cell. Specifically, the first insulating member 20 is disposed on the side of the cover plate body 10 facing the inside of the battery cell, that is, the first insulating member 20 is attached to the surface of the cover plate body 10 facing the inside of the battery cell.

[0044] like Figures 1 to 7As shown, a recessed first cavity 21 is formed on the side of the first insulating member 20 facing the cover plate body 10. The projection of the first cavity 21 on the cover plate body 10 covers the liquid injection hole 11, so that the setting of the first cavity 21 on the first insulating member 20 corresponds to the setting position of the liquid injection hole 11 on the cover plate body 10. A boss 22 that abuts against the electrode group is provided on the side of the first insulating member 20 facing the inside of the cell. A drainage channel 23 connecting the first cavity 21 and the electrode group is provided on the boss 22. Fluid flows through the drainage channel 23. The flow path in 3 is at least partially angled to the axis of the injection hole 11, so that a bent communication path is formed between the electrode group and the outside of the cell. This makes the injection hole 11 and the protrusion no longer opposite each other in terms of the thickness of the cover plate body 10, so as to avoid the force being directly applied to the electrode group during injection and vacuuming or venting. This reduces the force on the electrode group while meeting the injection or venting requirements, thus improving the situation where the diaphragm in the electrode group blocks the drainage channel 23 when injection or venting is performed through the injection hole 11.

[0045] Preferably, along the flow direction of the fluid in the drainage channel 23, one end of the drainage channel 23 is connected to the side of the boss 22 facing the electrode assembly, so that the boss 22 has a connecting hole 25 as described below at the end away from the cover plate body 10 in the thickness direction, so as to ensure that the injected electrolyte can directly wet the electrode assembly. The other end of the drainage channel 23 is connected to the side wall of the first cavity 21, so that a connecting part 27 as described below is formed on the first insulating member 20. This arrangement makes the bottom of the first cavity 21 closed.

[0046] In this embodiment, as Figure 1 , Figure 4 and Figure 5 As shown, the through portion 70 is formed on the side wall of the boss 22 and communicates with the drainage channel 23. In this way, even if the end of the drainage channel 23 that communicates with the electrode group is blocked by the diaphragm, the through portion 70 can still be connected to the first cavity 21. The setting of the through portion 70 ensures smooth electrolyte inflow, thereby improving the efficiency of electrolyte injection, reducing the injection time and the risk of electrolyte overflow, and improving the stability of the cell in timely discharge through the injection hole 11 under high temperature baking and pre-charging process, avoiding cell swelling, thereby optimizing cell performance and safety performance.

[0047] In this embodiment, as Figure 4 and Figure 7As shown, on the first insulating member 20, the first cavity 21 and the boss 22 are arranged along the first direction D1; the cover plate body 10 is formed into a plate structure, and the first direction D1 is parallel to the cover plate body 10. This makes the position on the first insulating member 20 corresponding to the injection hole 11 staggered from the position on the first insulating member 20 used to abut the electrode group. This avoids the first insulating member 20 being too large in the thickness direction of the cover plate body 10 and occupying the space inside the cell. At the same time, it ensures that the flow path of the fluid in the drainage channel 23 is at least partially angled to the axis of the injection hole 11, so as to avoid the force being directly applied to the electrode group when injecting liquid and evacuating vacuum or venting. This reduces the force on the electrode group while meeting the liquid injection or venting requirements, thus improving the situation where the diaphragm in the electrode group blocks the drainage channel 23.

[0048] In this embodiment, the through portion 70 can be a groove structure or a through hole structure. When the through portion 70 is a groove structure, it can be formed by the first insulating member 20 being recessed inward from the side facing the cover plate body 10. The opening area and / or the number of through portions 70 can be set according to actual needs. It should be noted that after the cell cover plate and the cell housing are assembled, there is a gap between the first insulating member 20 and the cell housing.

[0049] Specifically, such as Figures 1 to 7 As shown, a recessed second cavity 24 is formed on the side of the first insulating member 20 facing the cover plate body 10. The second cavity 24 and the boss 22 are arranged opposite to each other on the first insulating member 20 along the thickness direction of the cover plate body 10. A connecting hole 25 is provided at the bottom of the second cavity 24. The connecting hole 25 is a through hole structure that connects the second cavity 24 and the electrode assembly. A through portion 70 is provided on the side of the second cavity 24. That is, the connecting hole 25 and the through portion 70 are provided on different cavity walls of the second cavity 24. This ensures that even if the connecting hole 25 is blocked by the diaphragm of the electrode assembly, the through portion 70 can still communicate with the first cavity 21.

[0050] More specifically, such as Figure 1 , Figures 4 to 7 As shown, a partition 26 is provided between the second cavity 24 and the first cavity 21, thus making the first cavity 21 and the second cavity 24 independent cavity structures. A connecting portion 27 is provided on the partition 26 to connect the first cavity 21 and the second cavity 24. The connecting portion 27, the second cavity 24, and the connecting hole 25 form a drainage channel 23. Preferably, the first cavity 21 and the second cavity 24 are arranged at intervals in a direction parallel to the plane of the cover plate body 10, thus ensuring that at least a portion of the drainage channel 23 is angled to the axial direction of the injection hole 11. For example, the first cavity 21 and the second cavity 24 are arranged at intervals in a first direction D1. When the cover plate body 10 is formed as a strip structure, the first direction D1 is the length direction of the cover plate body 10.

[0051] In a preferred embodiment, the connecting portion 27 is formed as a groove structure recessed inward from the side of the first insulating member 20 facing the cover plate body 10. Specifically, the connecting portion 27 is formed by the partition 26 recessed inward from the side of the partition facing the cover plate body 10. In other alternative embodiments, the connecting portion 27 may also be formed as a through-hole structure.

[0052] Preferably, multiple connecting portions 27 are provided, and the multiple connecting portions 27 are arranged at intervals on the partition 26 to improve the efficiency of fluid injection or discharge. For example Figure 6 As shown, multiple connecting parts 27 are arranged at intervals along the second direction D2 on the partition 26. The second direction D2 is perpendicular to the first direction D1. When the cover body 10 is formed into a strip structure, the first direction D1 is the width direction of the cover body 10.

[0053] Preferably, multiple connecting holes 25 are provided to improve the effect of electrolyte wetting of the electrode assembly and to a certain extent reduce the risk of the connecting holes 25 being blocked.

[0054] In this embodiment, as Figure 4 and Figure 7 As shown, in the first direction D1, the baffle 26 is inclined on the side facing the second cavity 24, thus serving as a guide to improve the efficiency of liquid injection or venting. It should be noted that the inclined arrangement of the baffle 26 on the side facing the second cavity 24 causes the cross-sectional area of ​​the second cavity 24 to gradually decrease from the opening side to the bottom side.

[0055] In this embodiment, the interconnected area of ​​the injection hole 11 is S1, in mm. 2 That is, the effective area on the injection hole 11 that can connect the inside and outside of the cell is S1. For example, if the injection hole 11 is formed as a stepped hole, the area of ​​the part with the smallest radial dimension on the stepped hole is S1; Figure 3 As shown, when the injection hole 11 is formed as a circular hole, the radius of the injection hole 11 is r in mm, that is, S1 = πr. 2 The sum of the cross-sectional areas of all the connecting parts 27 perpendicular to the first direction D1 is S2, in mm. 2 That is, the effective area on the partition 26 that can connect the first cavity and the second cavity is S2, S2≥S1, so as to improve the efficiency of electrolyte injection and the reliability of gas being discharged quickly from the injection hole 11.

[0056] Furthermore, in this embodiment, as Figure 6 and Figure 7As shown, the connecting portion 27 has a rectangular cross-section perpendicular to the first direction D1. The dimension of the rectangular connecting portion 27 in the thickness direction of the cover plate body 10 is h (in mm); the dimension of the rectangular connecting portion 27 in the second direction D2 is m (in mm); the number of connecting portions 27 is n; S2 = n × h × m. Figure 6 In the structure shown, n=2; in other alternative embodiments, n=1, 3, 4...

[0057] Multiple tests were conducted on battery cells with different dimensional parameters to verify whether S2≥S1 improves the efficiency of electrolyte injection and the reliability of rapid gas discharge from the injection hole 11. Specific tests are described in Tests 1 to 3 below. It should be noted that Tests 1 to 3 use the thickness of the battery cell during the manufacturing process to indicate whether blockages occur within the cell. If the cell thickness remains within the set tolerance, it indicates smooth electrolyte injection and smooth gas discharge from the injection hole 11. If the cell thickness exceeds the set tolerance during the manufacturing process, it indicates increased internal gas pressure causing cell bulging, suggesting problems with electrolyte injection and gas discharge.

[0058] Experiment 1: r=1.5mm, n=2, h=2. Under different m conditions, measure whether the cell thickness in the process is within the tolerance range of 20±0.2mm. The test results are shown in Table 1.

[0059] Table 1

[0060]

[0061] Experiment 2: r=2mm, n=2, h=2.5. Under different m conditions, the thickness of the battery cell during the manufacturing process was measured to see if it was within the tolerance range of 22±0.2mm. The test results are shown in Table 2.

[0062] Table 2

[0063]

[0064] Experiment 3: r=1.3mm, n=2, h=1.8. Under different m conditions, measure whether the cell thickness in the process is within the tolerance range of 16±0.2mm. The test results are shown in Table 3.

[0065] Table 3

[0066]

[0067] Furthermore, in the embodiments, such as Figures 5 to 7As shown, the first insulating member 20 is formed into a strip structure, and a boss 22 is disposed at one end of the first insulating member 20 along its length. A first mounting hole 28 for the electrode post 60 to pass through is provided on the first insulating member 20. A first cavity 21 is disposed between the first mounting hole 28 and the boss 22. This arrangement positions the boss 22 at the edge of the first insulating member 20, thereby improving the reliability of the boss 22 in limiting the position of the electrode assembly within the cell. Preferably, a bump structure capable of abutting against the electrode assembly is also provided at the other end of the first insulating member 20 along its length.

[0068] Furthermore, in this embodiment, such as Figures 1 to 4 As shown, the cell cover also includes a terminal post 60, a sealing element 50, a connector 40, and a second insulating element 30. The connector 40 has a connecting hole 41. One end of the terminal post 60, located outside the cell, passes through the connecting hole 41 and is riveted and / or welded to the connector 40 to fix the terminal post 60 to the cell cover. The end of the terminal post 60 inside the cell forms a plate structure that connects to the tabs on the electrode assembly. The first insulating element 20 is sandwiched between the plate structure of the terminal post 60 and the cover body 10. The second insulating element 30... The electrode post 60 is sandwiched between the cover plate body 10 and the connector 40 to provide insulation protection for the cover plate body 10. The cover plate body 10 has an assembly hole 12, the first insulating component 20 has a first mounting hole 28, and the second insulating component 30 has a second mounting hole 31. The cylindrical portion of the electrode post 60 sequentially passes through the first mounting hole 28, the assembly hole 12, and the second mounting hole 31, extending into the connector 41 to fix it to the connector 41, thereby fixing the electrode post 60 to the cell cover plate. The sealing element 50 can be a fluororubber sealing ring. The sealing element 50 is sleeved on the cylindrical portion of the electrode post 60 and passes through the first mounting hole 28 and the assembly hole 12 together with the cylindrical portion. Part of the sealing element 50 is sandwiched between the plate structure of the electrode post 60 and the cover plate body 10, and part of the sealing element 50 is sandwiched between the plate structure of the electrode post 60 and the second insulating component 30, causing the sealing element 50 to be compressed to ensure the sealing performance of the cell cover plate.

[0069] According to the present invention, a battery cell cover plate is provided, wherein a liquid injection hole 11 is provided on the cover plate body 10; a first insulating member 20 is provided on the side of the cover plate body 10 facing the inside of the battery cell; a recessed first cavity 21 is formed on the side of the first insulating member 20 facing the cover plate body 10, and the projection of the first cavity 21 on the cover plate body 10 covers the liquid injection hole 11; a boss 22 is provided on the side of the first insulating member 20 facing the inside of the battery cell, which abuts against the electrode assembly; a drainage channel 23 is provided on the boss 22, connecting the first cavity 21 and the electrode assembly; a through portion 70 is provided on the side wall of the boss 22 and connects with the drainage channel. Channel 23 is connected; the flow path of fluid in channel 23 is at least partially angled to the axis of injection hole 11, so that a tortuous connection path is formed between the electrode group and the outside of the cell. This improves the situation where the diaphragm in the electrode group blocks the channel 23. The setting of the through part 70 ensures smooth electrolyte inflow, thereby improving the efficiency of electrolyte injection, reducing the injection time and the risk of electrolyte overflow, and improving the stability of the cell under high temperature baking and pre-charging process, so as to prevent the cell from swelling and thus ensure the performance and safety of the cell.

[0070] The present invention provides a battery cell comprising the battery cell cover plate as described above, and thus possesses all the beneficial effects of a battery cell cover plate, which will not be repeated here.

[0071] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery cell cover plate, characterized in that, include: The cover plate body has an injection hole; The first insulating element is disposed on the side of the cover plate body facing the inside of the battery cell; The first insulating member has a recessed first cavity on the side facing the cover plate body, and the projection of the first cavity on the cover plate body covers the liquid injection hole; the first insulating member has a boss that abuts against the electrode group on the side facing the inside of the cell, and a drainage channel connecting the first cavity and the electrode group is provided on the boss, and the flow path of the fluid in the drainage channel is at least partially angled to the axis of the liquid injection hole. The through-hole is formed on the side wall of the boss and communicates with the drainage channel.

2. The cell cover plate according to claim 1, characterized in that, The first insulating member has a recessed second cavity on the side facing the cover plate body. A connecting hole is provided at the bottom of the second cavity, and the through portion is provided on the side of the second cavity. A partition is provided between the second cavity and the first cavity. A connecting portion is provided on the partition to connect the first cavity and the second cavity. The connecting portion, the second cavity and the connecting hole form the drainage channel.

3. The cell cover plate according to claim 2, characterized in that, The connecting portion is formed as a groove structure that is recessed inward from the side of the first insulating member facing the cover plate body; And / or, multiple connecting portions are provided, and the multiple connecting portions are arranged at intervals on the partition.

4. The cell cover plate according to claim 2, characterized in that, In the first direction, the partition is inclined on the side facing the second cavity.

5. The cell cover plate according to claim 2, characterized in that, The interconnecting area of ​​the injection hole is S1, in mm. 2 The sum of the cross-sectional areas of all the connecting parts perpendicular to the first direction is S2, in mm. 2 S2≥S1.

6. The cell cover plate according to claim 5, characterized in that, The connecting portion has a rectangular cross-section perpendicular to the first direction, and the dimension of the rectangle in the thickness direction of the cover plate body is h, in mm; the dimension of the rectangle in the second direction is m, in mm; the number of connecting portions is n; S2 = n × h × m.

7. The cell cover plate according to claim 1, characterized in that, On the first insulating member, the first cavity and the boss are arranged along a first direction; the cover plate body is formed as a plate-shaped structure, and the first direction is parallel to the cover plate body.

8. The cell cover plate according to claim 1, characterized in that, The first insulating member is formed into a strip structure, the boss is disposed at one end of the first insulating member in the length direction, the first insulating member has a first mounting hole for the electrode post to pass through, and the first cavity is disposed between the first mounting hole and the boss.

9. The cell cover plate according to claim 1, characterized in that, Along the flow direction of the fluid in the drainage channel, one end of the drainage channel leads to the side of the boss facing the electrode assembly, and the other end of the drainage channel leads to the side wall of the first cavity.

10. A battery cell, characterized in that, The cell cover plate included in any one of claims 1 to 9.

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