Battery cell insulation member, battery cell cover plate assembly, and battery cell

Abstract

This application relates to the field of battery technology, and in particular to a cell insulating component, a cell cover assembly, and a cell. The cell insulating component has a liquid injection groove protruding along a first preset direction and toward the electrode assembly side. The bottom wall of the liquid injection groove along the first preset direction is used to press the electrode assembly of the cell. At least one bottom corner of the liquid injection groove has a notch that penetrates both the bottom wall and the corresponding side wall of the liquid injection groove. Therefore, by providing a liquid injection groove on the cell insulating component corresponding to the liquid injection hole on the cover plate, and by creating a notch at the bottom corner of the liquid injection groove that penetrates both the bottom wall and the corresponding side wall, the side of the notch will not be blocked when the bottom wall of the liquid injection groove presses against the electrode assembly. This notch not only speeds up the liquid injection process but also ensures normal venting during vacuuming processes such as cell formation, effectively preventing cell bulging and improving production efficiency.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cell insulation component, a cell cover assembly, and a cell. Background Technology

[0002] Currently, the electrolyte injection structure of battery cells mostly adopts Figures 1 to 4 The structure shown allows electrolyte to be injected into the cell by punching injection holes 11' into the cover plate 1', i.e., the aluminum plate. Channels 21' for electrolyte flow and guide holes 22' are pre-reserved on the lower plastic 2' inside the cover plate 1'. However, after actual cell assembly, the lower plastic 2' often compresses the electrode assembly 3' to improve its stability. This results in a tight fit between the bottom of the lower plastic 2' and the electrode assembly 3', causing the electrode assembly 3' to block the guide holes 22'. The electrolyte can only penetrate and wet the electrode assembly 3' little by little, thus prolonging the injection and electrode wetting time, reducing production efficiency. Furthermore, during high-temperature formation and other vacuuming processes, the gas generated inside the cell cannot quickly escape from the guide holes 22' into the channel 21' and is eventually discharged through the injection holes 11', causing the cell to swell and affecting its safety performance and yield. Summary of the Invention

[0003] The purpose of this application is to provide a battery cell insulation component, a battery cell cover assembly, and a battery cell, which to a certain extent solves the technical problems existing in the prior art, such as the tight fit between the bottom of the lower plastic and the electrode assembly, which would block the liquid guiding holes on the lower plastic, and the electrolyte could only penetrate and wet the electrode assembly, thus prolonging the liquid injection and electrode wetting time and reducing production efficiency. At the same time, during the vacuuming process such as high-temperature formation of the battery cell, the gas generated inside cannot be quickly discharged, causing the battery cell to swell, affecting the safety performance and yield of the battery cell.

[0004] This application provides a battery cell insulation component, which has a liquid injection groove protruding along a first preset direction and toward the electrode group side of the battery cell. The bottom wall of the liquid injection groove along the first preset direction is used to press the electrode group of the battery cell. A notch is formed at at least one bottom corner of the liquid injection groove, and the notch penetrates the bottom wall and the corresponding side wall of the liquid injection groove.

[0005] In the above technical solution, further, along the first preset direction, the height of the notch is H1, and 1.5mm≤H1≤2.5mm.

[0006] In any of the above technical solutions, further, along the first preset direction, the total height of the battery cell insulation component is H, and 5.0mm≤H≤8.0mm.

[0007] In any of the above technical solutions, further, along the first preset direction, the compression of the bottom wall of the injection groove on the electrode assembly is H0, and 1.2mm≤H0≤1.8mm.

[0008] In any of the above technical solutions, further, along the first preset direction, the compression of the bottom wall of the injection groove on the electrode assembly is H0, the height of the notch is H1, and 1.2≤H1 / H0≤1.5.

[0009] In any of the above technical solutions, the notch is further provided on the side of the notch near the opening of the injection groove, and gradually expands from the inside of the injection groove to the outside.

[0010] In any of the above technical solutions, the inclination angle of the side of the notch near the opening of the injection groove is N, and 3°≤N≤8°.

[0011] In any of the above technical solutions, the bottom wall of the cell insulation component is further provided with a liquid injection through hole, and a preset distance is formed between the liquid injection through hole and any edge of the bottom wall of the cell insulation component.

[0012] In any of the above technical solutions, the total area of ​​all the injection holes along the first preset direction is S1, the total area of ​​all the notches along the first preset direction is S2, and 0.2≤S2 / (S1+S2)≤0.3.

[0013] In any of the above technical solutions, the total area of ​​all the injection holes along the first preset direction is S1 / mm. 2 The total area of ​​all the notches along the first preset direction is S² / mm. 2 The electrolyte injection time of the battery cell is designed to be T / min, and 0.7min / mm. 2 ≤T / (S1+S2)≤0.9min / mm 2 , where T≤25min.

[0014] In any of the above technical solutions, the number of injection through holes is multiple, and they are arranged sequentially at intervals around the center of the bottom wall of the injection groove.

[0015] In any of the above technical solutions, the injection through hole arranged along the length direction of the injection groove is waist-shaped, and the injection through hole arranged along other directions of the injection groove is a circular hole.

[0016] In any of the above technical solutions, the injection groove is further defined as a square groove, and the notch is formed at each of the four bottom corners of the injection groove.

[0017] In any of the above technical solutions, the notch further penetrates the bottom wall of the injection groove and the two corresponding and adjacent side walls of the groove.

[0018] In any of the above technical solutions, further, along the second preset direction, one end of the cell insulation member is formed with the liquid injection groove, and the opposite end of the cell insulation member is formed with a mating groove protruding along the first preset direction and toward the electrode group side, and the opening direction of the mating groove is the same as the opening direction of the liquid injection groove. The liquid injection groove is used to press one end of the electrode group, and the mating groove is used to press the other end of the electrode group. Along the first preset direction, the bottom wall of the mating groove is formed with an auxiliary through hole. Along the second preset direction, an electrode lug receiving groove with an opening facing the electrode assembly is formed between the injection groove and the mating groove. Along the second preset direction, the side walls of the injection groove and the mating groove that are close to each other are formed as the opposite side walls of the electrode lug receiving groove, and a reinforcing rib is provided in the electrode lug receiving groove.

[0019] This application also provides a cell cover assembly, including a cover plate and a cell insulating member as described in any of the above technical solutions. Along the first preset direction, the cell insulating member is installed on the inner side of the cover plate near the electrode assembly of the cell. The cover plate has an injection hole, and the injection groove on the cell insulating member is correspondingly disposed and connected to the injection hole on the cover plate along the first preset direction. Therefore, it possesses all the beneficial technical effects of this cell insulating member, which will not be elaborated further here.

[0020] This application also provides a cell cover assembly, including a housing, an electrode assembly, a cover plate, and a cell insulating member as described in any of the above technical solutions. The electrode assembly is installed within the housing, and the cover plate is installed at least one open end of the housing along a first preset direction. At least one cover plate is fitted with the cell insulating member, which is positioned close to the electrode assembly. The bottom wall of the liquid injection groove of the cell insulating member along the first preset direction presses against the electrode assembly. At least one cover plate has a liquid injection hole, and the corresponding liquid injection groove on the cell insulating member is correspondingly positioned and connected to the liquid injection hole along the first preset direction. Therefore, this cell insulating member possesses all the beneficial technical effects described herein, which will not be elaborated further here.

[0021] Compared with the prior art, the beneficial effects of this application are as follows: The cell insulation component provided in this application can be installed on the inner side of the cell cover plate near the electrode assembly. A liquid injection groove corresponding to the liquid injection hole on the cover plate is provided on the cell insulation component, and a notch is opened at the bottom corner of the liquid injection groove. The notch not only penetrates the bottom wall of the liquid injection groove, but also penetrates the corresponding side wall. In this way, when the bottom wall of the liquid injection groove presses against the electrode assembly, the side of the notch will never be blocked. This not only speeds up the liquid injection speed, but also ensures normal venting during vacuuming processes such as cell formation. This effectively avoids cell swelling, which helps to improve cell safety and yield, and also helps to improve production efficiency. Attached Figure Description To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A structural schematic diagram of a cover plate assembly provided for the prior art; Figure 2 Another structural schematic diagram of a cover plate assembly provided for the prior art; Figure 3 Assembly drawings of cover plate assemblies and pole groups provided for existing technology; Figure 4 for Figure 3 A partially enlarged structural diagram; Figure 5 This is a schematic diagram of the structure of the battery cell insulation component provided in the embodiments of this application; Figure 6 for Figure 5 A partially enlarged structural diagram; Figure 7 This is another structural schematic diagram of the battery cell insulation component provided in the embodiments of this application; Figure 8 for Figure 7 A partially enlarged structural diagram; Figure 9 Another structural schematic diagram of the battery cell insulation component provided in the embodiments of this application; Figure 10 for Figure 9 A partially enlarged structural diagram; Figure 11 Another structural schematic diagram of the battery cell insulation component provided in the embodiments of this application; Figure 12 for Figure 11 A partially enlarged structural diagram; Figure 13for Figure 12 A partially enlarged structural diagram; Figure 14 This is a schematic diagram of the structure of the battery cell cover assembly provided in the embodiments of this application; Figure 15 Another structural schematic diagram of the cell cover assembly provided in an embodiment of this application.

[0023] Figure label: 1'-Cover plate, 11'-Injection hole, 2'-Lower plastic, 21'-Channel, 22'-Guide hole, 3'-Electrode assembly; 1-Cell insulation component, 11-Injection groove, 12-Notch, 121-First notch, 13-Bottom wall of the groove, 14-First side wall of the groove, 15-Second side wall of the groove, 16-Injection through hole, 161-First injection through hole, 162-Second injection through hole, 17-Matching groove, 171-Auxiliary through hole, 18-Electrode receiving groove, 2-Cover plate, 21-Injection hole, a-First preset direction, b-Second preset direction. Detailed Implementation

[0024] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0025] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0026] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The following reference Figures 5 to 15 This application describes a cell insulation component, a cell cover assembly, and a cell according to some embodiments.

[0030] See Figures 5 to 15 As shown, an embodiment of this application provides a battery cell insulating member 1. The battery cell insulating member 1 has a liquid injection groove 11 protruding along a first preset direction a and toward the electrode group side of the battery cell. The bottom wall 13 of the liquid injection groove 11 along the first preset direction a is used to press the electrode group of the battery cell. A notch 12 is formed at at least one bottom corner of the liquid injection groove 11, and the notch 12 penetrates the bottom wall and the corresponding side wall of the liquid injection groove 11.

[0031] As can be seen from the structure described above, the cell insulation component 1 provided in this application can be installed on the inner side of the cover plate 2 of the cell near the electrode assembly. A liquid injection groove 11 corresponding to the liquid injection hole 21 on the cover plate 2 is provided on the cell insulation component 1, and a notch 12 is opened at the bottom corner of the liquid injection groove 11. The notch 12 not only penetrates the bottom wall 13 of the liquid injection groove 11, but also penetrates the corresponding side wall. In this way, when the bottom wall 13 of the liquid injection groove 11 presses against the electrode assembly, the side of the notch 12 will never be blocked. This can not only speed up the liquid injection speed, but also ensure normal venting during vacuuming processes such as cell formation. This can effectively prevent the cell from swelling, which helps to improve the safety and yield of the cell, and also helps to improve production efficiency.

[0032] Furthermore, preferably, the first preset direction a is the thickness direction of the cell insulation component 1, and preferably, the thickness direction of the cell insulation component 1, the thickness direction of the cover plate 2, the length direction of the electrode group and the length direction of the shell are all the same, but of course, it is not limited to this.

[0033] It should be noted that when the battery cell insulation component 1 provided in this application is used in conjunction with the cover plate 2 having a liquid injection hole 21, preferably, the liquid injection groove 11 on the battery cell insulation component 1 and the liquid injection hole 21 on the cover plate 2 are corresponding along the first preset direction a. Of course, the battery cell insulation component 1 provided in this application can also be used on a cover plate without a liquid injection hole, depending on the actual needs.

[0034] In one embodiment of this application, preferably, as shown below, Figure 12 As shown, along the first preset direction a, the height of the notch 12 is H1, and 1.5mm≤H1≤2.5mm. Based on the structure described above, it can be seen that if the height of the notch 12 is too large, it will affect the strength of the injection groove 11. If the height of the notch 12 is too small, it will be not conducive to injection and venting. Therefore, 1.5mm≤H1≤2.5mm is set. Of course, it is not limited to this optimal value range. H1<1.5mm or H1>2.5mm can also be set, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 12 As shown, along the first preset direction a, the total height of the battery cell insulation component 1 is H, and 5.0mm≤H≤8.0mm. Based on the structure described above, if the injection groove 11 is too high, it will occupy the space of the electrode assembly; if the injection groove 11 is too low, it will be not conducive to injection and venting. Therefore, 5.0mm≤H≤8.0mm is set. Of course, it is not limited to this optimal value range. H<5.0mm or H>8.0mm can also be set, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 8 As shown, along the first preset direction a, the compression amount of the bottom wall 13 of the injection groove 11 against the electrode group is H0, and 1.2mm≤H0≤1.8mm. As can be seen from the structure described above, if the compression of the bottom wall 13 of the injection groove 11 against the electrode assembly is too large, it will seal the injection through hole 16 on the bottom wall 13 of the injection groove 11 too tightly, seriously affecting the injection efficiency; if the compression of the bottom wall 13 of the injection groove 11 against the electrode assembly is too small, it will not be able to press and limit the electrode assembly. Therefore, 1.2mm≤H0≤1.8mm is set. Of course, it is not limited to this optimal value range. H0<1.2mm or H0>1.8mm can also be set, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 8 As shown, along the first preset direction a, the compression of the electrode assembly by the bottom wall 13 of the injection groove 11 is H0, and the height of the notch 12 is H1, and 1.2≤H1 / H0≤1.5. It can be seen that if the height of the notch 12, i.e., the notched corner, is too low, the end of the electrode assembly will be squeezed after assembly, and the vent hole of the notched corner will be easily blocked by the electrode assembly. If the height of the notch 12, i.e., the notched corner, is too high, it will affect the strength. Therefore, H1 / H0 should be taken within the above-mentioned optimal range. Of course, it is not limited to this. H1 / H0 can also be less than 1.2 or greater than 1.5.

[0035] In one embodiment of this application, preferably, as shown below, Figure 12 and Figure 13As shown, the side of the notch 12 closest to the opening of the injection groove 11 is inclined and gradually expands from the inside of the injection groove 11 to the outside. As can be seen from the structure described above, setting the side of the notch 12 near the groove opening in an inclined shape can increase the size of the notch 12 penetrating the side wall of the injection groove 11, increase the injection volume and venting volume on the side, and help improve the injection efficiency and venting efficiency.

[0036] Furthermore, preferably, the inclination angle of the side of the notch 12 near the opening of the injection groove 11 is N, and 3°≤N≤8°. If the value of N is too large, the missing area on the side of the injection groove 11 will be too large, affecting the strength of the side wall of the injection groove 11. If the value of N is too small, the missing area on the side of the injection groove 11 will be too small, which is not conducive to injection and venting. Therefore, 3°≤N≤8° is set. Of course, it is not limited to this optimal value range. N<3° or N>8° can also be set, depending on the actual needs.

[0037] In one embodiment of this application, preferably, as shown below, Figures 5 to 10 As shown, the bottom wall 13 of the cell insulation component 1 has a liquid injection hole 16, and a predetermined distance is formed between the liquid injection hole 16 and any edge of the bottom wall 13 of the cell insulation component 1. As can be seen from the structure described above, a liquid injection through hole 16 is provided inside the bottom wall 13 of the cell insulation component 1 to realize the operation of liquid injection inside the cell. Moreover, a preset distance is formed between the liquid injection through hole 16 and any edge of the bottom wall 13 of the cell insulation component 1 to avoid affecting the strength of the bottom edge of the liquid injection groove 11. Of course, it is not limited to this. In one embodiment of this application, preferably, as shown below, Figure 10 As shown, the total area of ​​all the injection holes 16 along the first preset direction a is S1, and the total area of ​​all the notches 12 along the first preset direction a is S2, and 0.2≤S2 / (S1+S2)≤0.3. The notches 12 occupy too large an area of ​​the total injection area, which can improve the injection efficiency, but will reduce the strength at the bottom corner of the injection groove 11. The notches 12 occupy too small an area of ​​the total injection area, which can ensure the strength at the bottom corner of the injection groove 11, but will reduce the injection efficiency.

[0038] Of course, it is not limited to this optimal range of values. You can also set S2 / (S1+S2)<0.2 or set S2 / (S1+S2)>0.3, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 10 As shown, the total area of ​​all the injection holes 16 is S1 / mm. 2 The total area of ​​all the gaps 12 is S2 / mm. 2The electrolyte injection time for the battery cell is T / min, and 0.7min / mm. 2 ≤T / (S1+S2)≤0.9min / mm 2 The T≤25min setting not only meets the electrolyte injection parameter requirements of the battery cell, but also avoids the problem of battery cell swelling caused by insufficient or slow venting during high-temperature formation processes. This greatly improves the battery cell production yield and enhances the safety performance of the battery cell.

[0039] Of course, it is not limited to this optimal range; T / (S1+S2)<0.7min / mm can also be set. 2 Alternatively, let T / (S1+S2)>0.9min / mm 2 Choose according to your actual needs.

[0040] In one embodiment of this application, preferably, as shown below, Figure 6 and Figure 8 As shown, there are multiple injection through holes 16, which are arranged sequentially at intervals around the center of the bottom wall 13 of the injection groove 11. As can be seen from the structure described above, the multiple sequentially arranged injection holes 16 in this application help to ensure the uniformity of injection. Of course, it is not limited to this; the multiple injection holes 16 can be arranged arbitrarily, for example, they can be arranged in an array along the length and width directions of the injection groove 11, etc. In addition, it should be noted that the number of injection holes 16 is not limited to multiple, but can also be one, etc. In one embodiment of this application, preferably, as shown below, Figure 8 As shown, the injection through hole 16, also known as the first injection through hole 161, which is set along the length of the injection groove 11 is waist-shaped, while the injection through hole 16, also known as the second injection through hole 162, which is set along other directions of the injection groove 11 is a circular hole. As can be seen from the structure described above, the length of the injection groove 11 has a large space, therefore the injection through hole 16, i.e., the first injection through hole 161, provided along the length of the injection groove 11 is designed as an oblong shape. The areas in other directions of the injection groove 11 are relatively small, therefore the injection through holes 16 provided along other directions of the injection groove 11 are designed as circular holes. Of course, the shape of the injection through hole 16 can be designed arbitrarily, depending on the actual needs.

[0041] In one embodiment of this application, preferably, as shown below, Figure 14 and Figure 15 As shown, the liquid injection groove 11 and the liquid injection hole 21 on the cover plate 2 of the battery cell are respectively arranged along the first preset direction a; the projection of the liquid injection through hole 16 along the first preset direction a and the projection of the liquid injection hole 21 along the first preset direction a have no overlapping area. As described above, the injection through-hole 16 and injection hole 21 are staggered. This means that the area along the first preset direction a directly opposite the injection hole 21 is a solid structure, not a through-hole, thus providing a buffering effect during electrolyte injection. Of course, this is not the only option; the injection through-hole 16 can also be provided along the first preset direction a in the area directly opposite the injection hole 21, depending on actual needs.

[0042] In one embodiment of this application, preferably, as shown below, Figure 6 and Figure 8 As shown, the injection groove 11 is a square groove, and notches 12 are formed at the four bottom corners of the injection groove 11. As can be seen from the structure described above, the injection groove 11 is designed as a regular directional groove with a square bottom wall 13, which provides good clamping and limiting effect on the electrode assembly. Moreover, its regular shape makes it easy to process and manufacture. In addition, notches 12 are provided at the four bottom corners of the injection groove 11 to achieve uniform injection and venting in all directions, which helps to improve the injection and venting effects. Of course, it is not limited to this. Notches 12 can also be provided at one, two, or three bottom corners of the injection groove 11, depending on the actual needs.

[0043] In addition, it should be noted that the injection groove 11 is not limited to a square groove, but can also be a groove of other shapes, such as a pentagonal groove or a hexagonal groove, etc. Moreover, the specific bottom corner where the notch 12 is made and how many bottom corners the notch 12 is made can be selected according to actual needs.

[0044] In one embodiment of this application, preferably, as shown below, Figure 6 As shown, the notch 12 penetrates the bottom wall 13 of the injection groove 11 and the two corresponding and adjacent side walls. For example, taking the first notch 121 as an example, the first notch 121 not only penetrates the bottom wall 13 of the injection groove 11, but also penetrates the adjacent first side wall 14 and second side wall 15. For a single notch 12, this facilitates injection and venting at the missing parts of the two adjacent side walls corresponding to the notch 12, that is, it enables injection and venting from two directions, which helps to improve the injection and venting effect. Of course, it is not limited to this; for a single notch 12, it may also penetrate only one corresponding side wall.

[0045] In one embodiment of this application, preferably, as shown below, Figure 5 and Figure 7As shown, along the second preset direction b, one end of the cell insulation member 1 is formed with an injection groove 11, and the opposite end of the cell insulation member 1 is formed with a mating groove 17 protruding along the first preset direction a and toward the electrode group side. The opening direction of the mating groove 17 is the same as the opening direction of the injection groove 11. The injection groove 11 is used to press one end of the electrode group, and the mating groove 17 is used to press the other end of the electrode group. Along the first preset direction a, the bottom wall of the mating groove 17 is formed with an auxiliary through hole 171. Along the second preset direction b, an electrode lug receiving groove 18 with an opening facing the electrode assembly side is formed between the liquid injection groove 11 and the mating groove 17. Along the second preset direction b, the side walls of the liquid injection groove 11 and the mating groove 17 that are close to each other are formed as the opposite side walls of the electrode lug receiving groove 18, and reinforcing ribs are provided in the electrode lug receiving groove 18. As can be seen from the structure described above, the mating groove 17 and the liquid injection groove 11 are located at both ends of the cell insulation component 1, respectively. In this way, the outer bottom wall of the liquid injection groove 11 and the outer bottom wall of the mating groove 17 can be used to abut against both ends of the electrode assembly, thereby pressing both ends of the electrode assembly, making the electrode assembly more stable and less prone to movement. Furthermore, designing the other end of the cell insulation component 1 as a groove structure helps with lightweight design.

[0046] In addition, an electrode lug receiving groove 18 is formed between the injection groove 11 and the mating groove 17, and reinforcing ribs are provided in the electrode lug receiving groove 18, which serves to increase strength and support and limit the electrode lug.

[0047] Furthermore, preferably, the second preset direction b is the length direction of the cell insulation component 1, and preferably, the length direction of the cell insulation component 1, the length direction of the cover plate 2, the height of the electrode group and the height direction of the shell are all the same, but of course, it is not limited to this. Furthermore, preferably, the width direction of the cell insulation component 1, the width direction of the cover plate 2, the width direction of the electrode group, and the width direction of the housing are all the same, but of course, it is not limited to this. In summary, to verify the effectiveness of the solution, actual measurements were conducted on solutions of different sizes. The verification results are shown in Table 1 below: Based on the experimental data above, it can be seen that after adding the venting structure according to the above design requirements, the electrolyte injection time of the battery cell meets the process design requirements; during the high-temperature formation of the battery cell and other processes, there was no problem of battery cell swelling due to untimely venting.

[0048] Table 1 Experimental Data

[0049] See Figure 14 and Figure 15As shown, embodiments of this application also provide a cell cover assembly, including a cover plate 2 and a cell insulating member 1 as described in any of the above embodiments. The cell insulating member 1 is installed on the inner side of the cover plate 2 near the electrode assembly of the cell along a first preset direction a. The cover plate 2 has an injection hole 21, and an injection groove 11 is correspondingly disposed and connected to the injection hole 21 on the cover plate 2. Therefore, it possesses all the beneficial technical effects of the cell insulating member 1, which will not be elaborated further here.

[0050] An embodiment of this application also provides a battery cell (not shown in the figure), including a housing, an electrode assembly, a cover plate 2, and a battery cell insulating member 1 as described in any of the above embodiments. The electrode assembly is installed inside the housing along a first preset direction a. At least one open end of the housing is fitted with a cover plate 2, and at least one cover plate 2 is fitted with a battery cell insulating member 1. The battery cell insulating member 1 is positioned close to the electrode assembly, and the bottom wall 13 of the liquid injection groove 11 of the battery cell insulating member 1 presses against the electrode assembly. At least one cover plate 2 has a liquid injection hole 21, and the corresponding liquid injection groove 11 on the battery cell insulating member 1 is correspondingly positioned and connected to the liquid injection hole 21 along the first preset direction a. Therefore, it possesses all the beneficial technical effects of the battery cell insulating member 1, which will not be elaborated further here.

[0051] Furthermore, preferably, openings are formed at both ends of the shell along the first preset direction a, that is, the height direction of the shell, and cover plates 2 are installed on both openings. One of the cover plates 2, that is, the first cover plate 2, is equipped with the cell insulation component 1 described in the aforementioned embodiment, and the other cover plate 2, that is, the second cover plate 2, is equipped with other types of cell insulation components 1, that is, existing lower plastic. The first cover plate 2 is provided with a liquid injection hole 21, which is correspondingly arranged with the liquid injection groove 11 of the cell insulation component 1 equipped on the first cover plate 2 along the first preset direction a. The second cover plate 2 is provided with an explosion-proof valve.

[0052] Of course, it is not limited to the above. The first cover plate 2 and the second cover plate 2 can also be equipped with the battery cell insulation component 1 mentioned above. In addition, the liquid injection hole 21 and the explosion-proof valve can also be set on the same cover plate 2 at the same time, depending on the actual needs.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell insulation component, characterized in that, The cell insulation member has a liquid injection groove protruding along a first preset direction and toward the electrode group side of the cell. The bottom wall of the liquid injection groove along the first preset direction is used to press the electrode group of the cell. A notch is formed at at least one bottom corner of the liquid injection groove, and the notch penetrates the bottom wall and the corresponding side wall of the liquid injection groove.

2. The cell insulation component according to claim 1, characterized in that, Along the first preset direction, the height of the notch is H1, and 1.5mm ≤ H1 ≤ 2.5mm; and / or Along the first preset direction, the total height of the battery cell insulation component is H, and 5.0mm≤H≤8.0mm.

3. The cell insulation component according to claim 1, characterized in that, Along the first preset direction, the compression of the bottom wall of the injection groove on the electrode assembly is H0, and 1.2mm ≤ H0 ≤ 1.8mm; and / or Along the first preset direction, the compression of the bottom wall of the injection groove on the electrode assembly is H0, the height of the notch is H1, and 1.2≤H1 / H0≤1.

5.

4. The cell insulation component according to claim 1, characterized in that, The notch is inclined on the side near the opening of the injection groove, and gradually expands from the inside of the injection groove to the outside.

5. The cell insulation component according to claim 4, characterized in that, The inclination angle of the side of the notch closest to the opening of the injection groove is N, and 3°≤N≤8°.

6. The cell insulation component according to claim 1, characterized in that, The bottom wall of the cell insulation component has a liquid injection hole, and the liquid injection hole is at a predetermined distance from any edge of the bottom wall of the cell insulation component.

7. The cell insulation component according to claim 6, characterized in that, The total area of ​​all the injection holes along the first preset direction is S1, and the total area of ​​all the notches along the first preset direction is S2, and 0.2 ≤ S2 / (S1+S2) ≤ 0.3; and / or The total area of ​​all the injection holes along the first preset direction is S1 / mm. 2 The total area of ​​all the notches along the first preset direction is S² / mm. 2 The electrolyte injection time of the battery cell is designed to be T / min, and 0.7min / mm. 2 ≤T / (S1+S2)≤0.9min / mm 2 Where T≤25min; and / or The number of injection through holes is multiple, and they are sequentially spaced around the center of the bottom wall of the injection groove; and / or The injection through hole arranged along the length of the injection groove is waist-shaped, and the injection through hole arranged along other directions of the injection groove is a circular hole.

8. The cell insulation component according to any one of claims 1 to 7, characterized in that, The injection groove is a square groove, and the notch is formed at each of the four bottom corners of the injection groove; and / or The notch penetrates the bottom wall of the injection groove and the corresponding and adjacent side walls of the two grooves; and / or Along the second preset direction, one end of the cell insulation member is formed with the liquid injection groove, and the opposite end of the cell insulation member is formed with a mating groove protruding along the first preset direction and toward the electrode group side, and the opening direction of the mating groove is the same as the opening direction of the liquid injection groove. The liquid injection groove is used to press one end of the electrode group, and the mating groove is used to press the other end of the electrode group. Along the first preset direction, the bottom wall of the mating groove is formed with an auxiliary through hole. Along the second preset direction, an electrode lug receiving groove with an opening facing the electrode assembly is formed between the injection groove and the mating groove. Along the second preset direction, the side walls of the injection groove and the mating groove that are close to each other are formed as the opposite side walls of the electrode lug receiving groove, and a reinforcing rib is provided in the electrode lug receiving groove.

9. A cell cover assembly, characterized in that, The device includes a cover plate and a cell insulation member as described in any one of claims 1 to 8, wherein the cell insulation member is installed on the inner side of the cover plate near the electrode assembly of the cell along the first preset direction; the cover plate has an injection hole, and the injection groove on the cell insulation member is correspondingly disposed and connected to the injection hole on the cover plate along the first preset direction.

10. A battery cell, characterized in that, The device includes a housing, an electrode assembly, a cover plate, and a cell insulation member as described in any one of claims 1 to 8; wherein the electrode assembly is installed inside the housing and along the first preset direction, the cover plate is installed at at least one open end of the housing, and at least one cover plate is equipped with the cell insulation member, which is disposed near the electrode assembly, and the bottom wall of the liquid injection groove of the cell insulation member along the first preset direction presses against the electrode assembly; at least one cover plate has a liquid injection hole, and the corresponding liquid injection groove on the cell insulation member is disposed and connected to the liquid injection hole along the first preset direction.

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