Separation frame, battery cell and battery pack

Abstract

The invention provides a separation frame, a battery cell and a battery pack, the separation frame comprises a plurality of frame bodies and elastic connectors, the plurality of frame bodies are arranged at intervals, the elastic connectors are connected between two adjacent frame bodies, and the elastic connectors can be compressed to deform so as to reduce the distance between the two adjacent frame bodies. According to the separation frame provided by the invention, the technical problem that the assembly of the separation frame in the existing battery cell is influenced due to production errors can be solved.

Description

Technical Field

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

[0002] The battery pack is composed of multiple battery cells, which mainly include a shell, an electrode assembly and an electrode terminal. The electrode assembly is installed in the shell, and the electrode terminal is installed on the top cover of the shell. The electrode terminal is conductively connected to the electrode tab on the electrode assembly, and in order to avoid conductive contact between the top cover and the electrode assembly, a partition plate (also called an insulating plate, plastic plate, etc.) is also provided between the top cover and the electrode assembly, and the partition plate is fixedly connected to the inner wall of the shell.

[0003] In the related art, due to production errors, the size of the partition plate is larger or smaller than the preset size. When the size is larger, it is more difficult to assemble. When the size is smaller, it affects the positioning of the partition plate in the shell, and the assembly is unstable. Summary of the invention

[0004] The embodiments of the present invention provide a partition frame, a battery cell and a battery pack, which can improve the technical problem that the partition frame in the existing battery cell is affected in assembly due to production errors.

[0005] In the first aspect, an embodiment of the present invention provides a partition frame, which includes a plurality of frames and an elastic connector. The plurality of frames are arranged at intervals, and the elastic connector is connected between two adjacent frames. The elastic connector can be compressed and deformed to reduce the distance between two adjacent frames.

[0006] Optionally, in one embodiment, the cross-section of the elastic connector is at least one of an inclined extending "I" shape, "X" shape, "V" shape, inverted "V" shape, "U" shape, inverted "U" shape, "N" shape, inverted "N" shape, "W" shape, and "M" shape.

[0007] Optionally, in one embodiment, the elastic connector and the frame are integrally formed.

[0008] Optionally, in one embodiment, the frame has a connecting surface, the elastic connecting body has a connecting end, the connecting end is connected to the connecting surface at an angle, and the angle between the connecting end and the connecting surface is a rounded angle.

[0009] Optionally, in one embodiment, a plurality of the frames are spaced apart along the length direction of the partition frame, and the elastic connector extends integrally along the width direction of the partition frame; or, a plurality of the elastic connectors are provided and spaced apart along the width direction of the partition frame.

[0010] And / or, a plurality of the frames are spaced apart along the width direction of the partition frame, and the elastic connector extends integrally along the length direction of the partition frame, or a plurality of the elastic connectors are provided, and the plurality of the elastic connectors are spaced apart along the length direction of the partition frame.

[0011] Optionally, in one embodiment, the plurality of frames include a main frame and a sub-frame, and the main frame and the sub-frame are spaced apart along the length direction of the partition frame, and in the length direction of the partition frame, the length of the main frame is greater than the length of the sub-frame.

[0012] And / or, the plurality of frames include a main frame and a sub-frame, the main frame and the sub-frame are spaced apart along the width direction of the partition frame, and in the width direction of the partition frame, the width of the main frame is greater than the width of the sub-frame.

[0013] Optionally, in one embodiment, a weight-reducing groove is provided on the sub-frame.

[0014] In a second aspect, an embodiment of the present invention provides a battery cell, comprising a shell, an electrode assembly and a separator as described in any one of the above embodiments, wherein an installation cavity is provided in the shell, and the shell includes a top cover, the electrode assembly is provided in the installation cavity, and the separator is fixed in the installation cavity and located between the electrode assembly and the top cover.

[0015] Optionally, in one embodiment, one of the inner wall of the installation cavity and the frame is provided with a positioning rib, and the other is provided with a positioning groove at a position corresponding to the positioning rib, and the positioning rib is snap-fitted into the positioning groove.

[0016] Optionally, in one embodiment, the positioning rib is provided on an inner wall of the installation cavity, and the positioning rib extends along a height direction of the shell.

[0017] Optionally, in one embodiment, an electrode terminal is installed on the top cover, and a pole ear is provided on the electrode assembly, and the pole ear includes an electrode assembly connecting section, a bending section and a pole connecting section connected in sequence; a partition plate is provided on the frame, and a through hole is provided on the partition plate, the electrode assembly connecting section is connected to the electrode assembly and is pressed between the electrode assembly and the partition plate, one end of the bending section passes through the through hole and is connected to the electrode assembly connecting section, and the other end is connected to the pole connecting section, the pole connecting section is welded to the electrode terminal, and the pole connecting section and the bending section are pressed between the electrode terminal and the partition plate.

[0018] Optionally, in one embodiment, the partition plate includes a first partition plate and a second partition plate, the first partition plate and the second partition plate are spaced apart to form the through hole, and one side of the first partition plate and / or the second partition plate is integrally connected to the frame, and the other side is suspended.

[0019] Optionally, in one embodiment, the top cover is provided with a terminal mounting hole connected to the mounting cavity, and the top cover is also provided with a positioning ring on the peripheral side of the terminal mounting hole, and a supporting ring on the inner peripheral wall of the terminal mounting hole; the battery cell also includes an electrode terminal, the electrode terminal is supported on the supporting ring, and the electrode terminal extends into the mounting cavity through the terminal mounting hole, and the positioning ring surrounds the outer periphery of the electrode terminal; wherein the positioning ring and the supporting ring are formed by bending part of the cover body of the top cover.

[0020] Optionally, in one embodiment, the battery cell also includes an electrode terminal, the electrode terminal includes a welding ring, a conductive block and an insulating connector, the welding ring is used to be welded and fixed to the top cover, the conductive block is used to be conductively connected to the pole ear on the electrode assembly, and the insulating connector is connected between the welding ring and the conductive block by injection molding; wherein the surfaces of the welding ring and the conductive block for connecting with the insulating connector are both provided with a pit structure.

[0021] Optionally, in one embodiment, an electrode terminal connected to the electrode assembly is installed on the top cover, and the shell also includes a bottom cover spaced opposite to the top cover, a liquid guide channel is provided on the surface of the bottom cover facing the top cover, and a liquid injection hole is also provided on the bottom cover, and the liquid injection hole is connected to the liquid guide channel.

[0022] Optionally, in one embodiment, an insulating sheet is further separated between the bottom cover and the electrode assembly; the insulating sheet is provided with micropores for electrolyte penetration, and / or the liquid conducting channel also passes through the side of the bottom cover.

[0023] In a third aspect, an embodiment of the present invention provides a battery pack, comprising the battery cell described in any one of the above embodiments.

[0024] Beneficial effects of the embodiments of the present invention:

[0025] The present application provides a spacer frame including a plurality of frames, wherein the plurality of frame members are arranged at intervals, and an elastic connector is connected between two adjacent frames, and the elastic connector can be compressed and deformed to reduce the distance between the two adjacent frames. Therefore, during production, the size of the spacer frame can be made larger than the preset assembly size, and during assembly, the distance between the two adjacent frames can be reduced by compressing the elastic connector, thereby adjusting the size of the spacer frame so that the actual size of the spacer frame is equal to the preset assembly size. This not only facilitates the installation of the spacer frame into the shell of the battery cell, but also enables the elastic restoring force of the elastic connector to press the frame tightly against the inner wall of the battery cell shell, thereby improving the stability of the spacer frame after assembly.

[0026] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of an embodiment of a partition frame of the present invention;

[0029] Figure 2 yes Figure 1 A top view of the partition frame in FIG.

[0030] Figure 3 yes Figure 1 A side view of a partition frame in FIG.

[0031] Figure 4 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0032] Figure 5 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0033] Figure 6 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0034] Figure 7 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0035] Figure 8 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0036] Fig. 9 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0037] Fig.10 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0038] Fig.11 A partial structural schematic diagram of another embodiment of a partition frame of the present invention;

[0039] Fig.12 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0040] Fig.13 It is a partial structural schematic diagram of another embodiment of the partition frame of the present invention;

[0041] Fig.14 It is a structural schematic diagram of an embodiment of a battery cell of the present invention;

[0042] Fig.15 yes Fig.14 The structural explosion diagram of the battery cell;

[0043] Fig.16 It is a partial structural schematic diagram of an embodiment of a battery cell of the present invention;

[0044] Fig.17 It is a partial structural schematic diagram of an embodiment of a shell in a battery cell of the present invention;

[0045] Fig.18 It is a partial structural cross-sectional view of an embodiment of a shell in a battery cell of the present invention;

[0046] Fig.19 1 is a cross-sectional view of an embodiment of an electrode terminal in a battery cell of the present invention.

[0047] Fig. 20 It is a structural schematic diagram of an embodiment of a bottom cover in a battery cell of the present invention. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0049] In order to solve the technical problem that the separator in the existing battery cell is affected by the production error, firstly, Figures 1 to 3 As shown, an embodiment of the present invention provides a partition frame 30, which mainly includes a plurality of frames 31 and an elastic connector 32. The plurality of frames 31 are arranged at intervals, and an elastic connector 32 is connected between two adjacent frames 31. The elastic connector 32 can be compressed and deformed to reduce the distance between two adjacent frames 31.

[0050] Specifically, in Figure 1 In the structural scheme shown, the partition frame 30 is in the shape of a rectangular plate as a whole, and the partition frame 30 includes three frames 31, and the three frames 31 are arranged at intervals along the length direction of the partition frame 30. An elastic connector 32 is connected between two adjacent frames 31. The elastic connector 32 can be a spring, elastic rubber, or other elastically deformable structure, as long as it can connect the two frames 31 and can be compressed and deformed.

[0051] Figure 3 for Figure 1 The side view of the partition frame 30 in Figure 3 It is understandable that when the elastic connector 32 is compressed and deformed, the spacing between two adjacent frames 31 will be reduced, and the overall length of the partition frame 30 will also be reduced. In other words, the size of the partition frame 30 can be adjusted by compressing the elastic connector 32.

[0052] Therefore, during production, the size of the partition frame 30 can be made larger than the preset assembly size. Even if a certain error occurs during the production process, the size of the partition frame 30 can be adjusted to the preset assembly size by compressing the elastic connector 32. That is, during assembly, the elastic connector 32 can be compressed to reduce the distance between two adjacent frames 31, so as to adjust the size of the partition frame 30 so that the actual size of the partition frame 30 is equal to the preset assembly size. This not only facilitates the installation of the partition frame 30 into the shell 10 of the battery cell 100, but also allows the elastic restoring force of the elastic connector 32 to press the frame 31 tightly against the inner wall of the shell 10 of the battery cell 100, thereby improving the stability of the partition frame 30 after assembly.

[0053] For example, Figure 1Taking the structural scheme shown as an example, three frames 31 are arranged at intervals along the length direction of the partition frame 30, and an elastic connector 32 is connected between two adjacent frames 31. The preset assembly length of the partition frame 30 in its length direction is 10 cm (Note: the specific preset assembly size needs to be determined according to the size of the shell 10 of the battery cell 100). During production, the length of the partition frame 30 can be produced according to 12 cm. Even if the actual length of the partition frame 30 is 13 cm or 11 cm due to production errors, the length of the partition frame can be reduced to 10 cm by compressing the elastic connector 32. In this way, the partition frame 30 can be conveniently installed in the shell 10 of the battery cell 100.

[0054] In addition, because the elastic connector 32 is compressed and deformed, the elastic connector 32 has an elastic restoring force to push the frame 31 outward, so that the frame 31 can be pressed tightly against the inner wall of the shell 10 under the action of the elastic connector 32, thereby achieving stable positioning and installation of the partition frame.

[0055] Of course, in other embodiments, the plurality of frames 31 may be spaced apart along the width direction of the partition frame 30, and an elastic connector 32 is connected between two adjacent frames 31, so that the width dimension of the partition frame 30 can be adjusted by compressing the elastic connector 32. Alternatively, among the plurality of frames 31, a portion of the frames 31 are spaced apart along the length direction of the partition frame 30, and another portion of the frames 31 are spaced apart along the width direction of the partition frame 30, and an elastic connector 32 is connected between any two adjacent frames 31, so that both the length dimension of the partition frame 30 and the width dimension of the partition frame 30 can be adjusted. In short, the arrangement relationship between the plurality of frames 31 can be flexibly set as needed.

[0056] In addition, the elastic connector 32 may be a spring, elastic rubber, or other elastically deformable structures. For example, in one embodiment, the elastic connector 32 is an elastically deformable structure. Specifically, Figures 3 to 13 As shown, the cross-section of the elastic connector 32 is at least one of an inclined extending "I" shape, "X" shape, "V" shape, inverted "V" shape, "U" shape, inverted "U" shape, "N" shape, inverted "N" shape, "W" shape, and "M" shape.

[0057] Specifically, Figure 3 As shown, the cross-section of the elastic connector 32 can be an inclined "I" shape, and the elastic connector 32 has two opposite connecting ends 321, one connecting end 321 is connected to a frame 31, and the other connecting end 321 is connected to another adjacent frame 31. It can be understood that at this time, when the two adjacent frames 31 are close to each other, the elastic connector 32 can be compressed and deformed.

[0058] like Figure 4 As shown, the cross-section of the elastic connector 32 may also be in an "X" shape. In this case, the elastic connector 32 has four connecting ends 321, two of which are connected to one frame 31, and the other two are connected to an adjacent frame 31. It can be understood that when two adjacent frames 31 are close to each other, the elastic connector 32 can be compressed and deformed.

[0059] like Figures 5 to 12 As shown, the cross-section of the elastic connector 32 can also be any one of a "V" shape, an inverted "V" shape, a "U" shape, an inverted "U" shape, an "N" shape, an inverted "N" shape, a "W" shape, and an "M" shape. At this time, the elastic connector 32 has two connecting ends 321, one of which is connected to a frame 31, and the other is connected to another adjacent frame 31. Similarly, when two adjacent frames 31 are close to each other, the elastic connector 32 can be compressed and deformed.

[0060] It should be noted that the cross-section of the elastic connector 32 can be any one of an inclined extending "I" shape, "X" shape, "V" shape, inverted "V" shape, "U" shape, inverted "U" shape, "N" shape, inverted "N" shape, "W" shape, and "M" shape.

[0061] Alternatively, the cross section of the elastic connector 32 may be a repeated combination of any one of an inclined "I" shape, an "X" shape, a "V" shape, an inverted "V" shape, a "U" shape, an inverted "U" shape, an "N" shape, an inverted "N" shape, a "W" shape, and an "M" shape, for example. Fig.13 As shown, the cross section of the elastic connector 32 is two “X” shapes (ie “XX”) connected side by side, which can also be compressed and deformed, thereby reducing the distance between two adjacent frames 31 .

[0062] Alternatively, the cross-section of the elastic connector 32 may be any combination of an inclined extended "I" shape, "X" shape, "V" shape, inverted "V" shape, "U" shape, inverted "U" shape, "N" shape, inverted "N" shape, "W" shape, and "M" shape. For example, the cross-section of the elastic connector 32 may be a combination of an inclined "I" shape and a "U" shape, so that it can be compressed and deformed, thereby reducing the distance between two adjacent frames 31.

[0063] Optionally, in one embodiment, as Figure 3As shown, the elastic connector 32 is integrally formed with the frame 31 , which can improve the connection stability between the elastic connector 32 and the frame 31 and avoid disconnection at the connection position between the elastic connector 32 and the frame 31 during use.

[0064] Of course, in other embodiments, the elastic connector 32 and the frame 31 may also be connected by bonding, clamping, screw connection, etc.

[0065] Optionally, in one embodiment, as Figure 3 As shown, the frame 31 has a connecting surface 313, and the elastic connecting body 32 has a connecting end 321. The connecting end 321 is connected to the connecting surface 313 at an angle, and the angle between the connecting end 321 and the connecting surface 313 is a rounded angle. This can avoid stress concentration when being compressed and deformed, thereby preventing the elastic connecting body 32 and the frame 31 from being disconnected.

[0066] Optionally, in one embodiment, as Figure 1 As shown, a plurality of frames 31 are spaced apart along the length direction of the partition frame 30, and the elastic connector 32 extends integrally along the width direction of the partition frame 30, that is, the elastic connector 32 can be the same width as the frame 31 to which it is connected, or a plurality of elastic connectors 32 can be provided, and the plurality of elastic connectors 32 are spaced apart along the width direction of the partition frame 30, and the plurality of elastic connectors 32 can be evenly spaced apart.

[0067] And / or, multiple frames 31 may be spaced apart along the width direction of the partition frame 30, and the elastic connector 32 may extend integrally along the length direction of the partition frame 30, that is, the length of the elastic connector 32 may be equal to the length of the frame 31, or, a plurality of elastic connectors 32 may be provided, and the plurality of elastic connectors 32 may be spaced apart along the length direction of the partition frame 30, and the plurality of elastic connectors 32 may be evenly spaced apart.

[0068] It can be understood that this arrangement of the present embodiment can achieve uniform variation in the spacing between two adjacent frames 31, and avoid the situation where after the elastic connector 32 is compressed and deformed, the spacing between two adjacent frames 31 is larger at some locations and smaller at others, resulting in an overall uneven spacing.

[0069] It should be noted that in this embodiment, the multiple frames 31 can be spaced apart along the length direction of the partition frame 30, or can be spaced apart along the width direction of the partition frame 30, or some of the frames 31 can be spaced apart along the length direction of the partition frame 30, and other frames 31 can be spaced apart along the width direction of the partition frame 30.

[0070] Optionally, in one embodiment, as Figures 1 to 3As shown, the plurality of frames 31 include a main frame 311 and a sub-frame 312, the main frame 311 and the sub-frame 312 are arranged at intervals along the length direction of the partition frame 30, and in the length direction of the partition frame 30, the length of the main frame 311 is greater than the length of the sub-frame 312. And / or, the plurality of frames 31 include a main frame 311 and a sub-frame 312, the main frame 311 and the sub-frame 312 are arranged at intervals along the width direction of the partition frame 30, and in the width direction of the partition frame 30, the width of the main frame 311 is greater than the width of the sub-frame 312.

[0071] Specifically, in this embodiment, the main frame 311 and the auxiliary frame 312 can be spaced apart along the length direction of the partition frame 30, in which case the length of the main frame 311 needs to be greater than the length of the auxiliary frame 312. Alternatively, the main frame 311 and the auxiliary frame 312 can be spaced apart along the width direction of the partition frame 30, in which case the width of the main frame 311 needs to be greater than the width of the auxiliary frame 312. Alternatively, a plurality of auxiliary frames 312 can be provided, wherein a portion of the auxiliary frames 312 and the main frame 311 are spaced apart along the length direction of the partition frame 30, and another portion of the auxiliary frames 312 and the main frame 311 are spaced apart along the width direction of the partition frame 30, in which case the length of the main frame 311 between the main frame 311 and the auxiliary frame 312 spaced apart along the length direction of the partition frame 30 is greater than the length of the auxiliary frame 312; and the width of the main frame 311 between the main frame 311 and the auxiliary frame 312 spaced apart along the width direction of the partition frame 30 is greater than the width of the auxiliary frame 312.

[0072] It can be understood that, because the two adjacent frames 31 are connected by the elastic connector 32, if the weight of the auxiliary frame 312 is large, the auxiliary frame 312 will sag relative to the main frame 311, thereby causing the entire partition frame 30 to be bent. Therefore, in this embodiment, when the main frame 311 and the auxiliary frame 312 are arranged at intervals along the length direction of the partition frame 30, the length of the main frame 311 is greater than the length of the auxiliary frame 312, or, when the main frame 311 and the auxiliary frame 312 are arranged at intervals along the width direction of the partition frame 30, the width of the main frame 311 is greater than the width of the auxiliary frame 312, so that the weight of the auxiliary frame 312 can be ensured to be small, thereby preventing the auxiliary frame 312 from sagging relative to the main frame 311 under the action of gravity, and ensuring that the partition frame 30 extends in a straight line as a whole.

[0073] Optionally, in one embodiment, as Figure 1 or Figure 2As shown, a weight-reducing groove 3121 is provided on the sub-frame 312, which can further reduce the weight of the sub-frame 312, thereby preventing the sub-frame 312 from sagging relative to the main frame 311 under the action of gravity, and ensuring that the partition frame 30 extends in a straight line as a whole. It should be noted that the weight-reducing groove 3121 can be a blind groove that does not pass through the sub-frame 312, or a through groove that passes through the sub-frame 312, and there can be multiple weight-reducing grooves 3121, which can be flexibly set according to needs.

[0074] Second, as Fig.14 , Fig.15 and Fig.16 As shown, an embodiment of the present invention provides a battery cell 100, the battery cell 100 includes a shell 10, an electrode assembly 20 and a separator 30 of any one of the above embodiments, the shell 10 is provided with an installation cavity 11, and the shell 10 includes a top cover 12, and the top cover 12 is installed with an electrode terminal 40, the electrode assembly 20 is arranged in the installation cavity 11, and the electrode assembly 20 is provided with a pole ear 21, and the pole ear 21 is conductively connected to the electrode terminal 40, the separator 30 is fixed in the installation cavity 11 and is located between the electrode assembly 20 and the top cover 12, and a through hole position 3153 can be provided on the separator 30 to facilitate the pole ear 21 to pass through the separator 30 and be conductively connected to the electrode terminal 40.

[0075] Specifically, in Fig.14 In the structural scheme shown, the shell 10 has a square cylindrical shape, and an installation cavity 11 is provided in the shell 10. The electrode assembly 20 is formed by winding a positive electrode sheet, a negative electrode sheet and a separator located between the positive electrode sheet and the negative electrode sheet. It is a component that produces an electrochemical reaction in the battery cell 100, thereby allowing the battery cell 100 to be charged and discharged. The specific structure and working principle of the electrode assembly 20 can refer to the relevant existing technology and will not be introduced in detail here.

[0076] In this embodiment, reference can be made to Fig.16 The electrode assembly 20 is installed in the installation cavity 11 of the shell 10, and the electrode assembly 20 is provided with a pole ear 21. The pole ear 21 is a conductive component on the electrode assembly 20 for outputting and inputting current. During assembly, the pole ear 21 is conductively connected to the electrode terminal 40.

[0077] like Fig.14 As shown, the housing 10 includes a top cover 12, on which an electrode terminal 40 is mounted, and the electrode terminal 40 is conductively connected to the tab 21 of the electrode assembly 20. Generally, in order to improve the heat dissipation performance and structural strength of the battery cell 100, the top cover 12 is made of aluminum. Since the aluminum top cover 12 is conductive, in order to avoid conductive contact between the top cover 12 and the electrode assembly 20, as shown in FIG. Fig.15 and Fig.16As shown, a spacer frame 30 is provided between the top cover 12 and the electrode assembly 20 . The spacer frame 30 is made of an insulating material (such as plastic), so that the top cover 12 and the electrode assembly 20 can be well separated.

[0078] Among them, the partition frame 30 is the partition frame 30 described in any one of the above embodiments. For example, a plurality of frames 31 in the partition frame 30 are arranged at intervals along the length direction of the partition frame 30, and the length direction of the partition frame 30 is parallel to the length direction of the shell 10. Therefore, the partition frame 30 can adjust the length dimension by compressing the elastic connector 32 so that it can be just assembled into the installation cavity 11 of the shell 10.

[0079] It can be understood that since the battery cell 100 of the present application adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0080] Optionally, in one embodiment, please combine Figure 1 and Fig.17 One of the inner wall of the mounting cavity 11 and the frame body 31 is provided with a positioning rib 13, and the other is provided with a positioning groove 314 at a position corresponding to the positioning rib 13. The positioning rib 13 is snapped into the positioning groove 314, thereby realizing the positioning of the partition frame 30 in the shell 10.

[0081] Specifically, in this embodiment, the inner wall of the installation cavity 11 may be provided with a positioning rib 13, and the frame 31 may be provided with a positioning groove 314; or the inner wall of the installation cavity 11 may be provided with a positioning groove 314, and the frame 31 may be provided with a positioning rib 13. The specific arrangement can be flexibly selected according to needs.

[0082] For example, optionally, in one embodiment, Fig.17 As shown, the positioning ribs 13 are arranged on the inner wall of the installation cavity 11, and the positioning ribs 13 extend along the height direction of the shell 10, so that the positioning ribs 13 can not only realize the positioning of the partition frame 30, but also serve as reinforcement ribs to strengthen the structural strength of the shell 10.

[0083] exist Figure 1In the structural scheme shown, the partition frame 30 includes a main frame body 311 and sub-frame bodies 312 located on both sides of the main frame body 311 in the length direction. A positioning groove 314 is provided on the side of each sub-frame body 312 away from the main frame body 311, and a positioning rib 13 is provided on the inner wall of the installation cavity 11. During assembly, the length of the partition frame can be reduced by first compressing the corresponding elastic connector 32 by two sub-frame bodies 312, so that the partition frame can be placed in the installation cavity 11 of the shell 10, and when placed in the installation cavity 11, the positioning groove 314 on each sub-frame body 312 corresponds to the positioning rib 13, and then the two sub-frame bodies 312 are loosened, and the two sub-frame bodies 312 move toward the positioning rib 13 under the elastic force of the elastic connector 32 until the positioning rib 13 is stuck in the positioning groove 314, so that the positioning of the partition frame 30 can be achieved.

[0084] Optionally, in one embodiment, as Fig.16 As shown, an electrode terminal 40 is installed on the top cover 12, and a pole ear 21 is provided on the electrode assembly 20. The pole ear 21 includes an electrode assembly connecting section 211, a bending section 212 and a pole connecting section 213 connected in sequence; a partition plate 315 is provided on the frame 31, and a through hole 3153 is provided on the partition plate 315. The electrode assembly connecting section 211 is connected to the electrode assembly 20 and is pressed between the electrode assembly 20 and the partition plate 315. One end of the bending section 212 passes through the through hole 3153 and is connected to the electrode assembly connecting section 211, and the other end is connected to the pole connecting section 213. The pole connecting section 213 is welded to the electrode terminal 40, and the pole connecting section 213 and the bending section 212 are pressed between the electrode terminal 40 and the partition plate 315.

[0085] Specifically, in this embodiment, if Fig.17 As shown, the lower end of the housing 10 is provided with an installation opening 15 connected to the installation cavity 11. The installation opening 15 is used for the electrode assembly 20 and the partition frame 30 to be installed in the installation cavity 11. The installation opening 15 can be covered by the bottom cover 14. Fig.15 , the separator 30 can be placed on the electrode assembly 20 first, and the bent section 212 and the pole connecting section 213 of the pole tab 21 are passed through the through hole 3153. Then the electrode assembly 20 and the separator 30 are installed into the installation cavity 11 from the installation opening 15, and then the bottom cover 14 is welded and fixed at the installation opening 15 to close the installation opening 15. Then the pole connecting section 213 of the pole tab 21 is welded to the electrode terminal 40, and then the electrode terminal 40 is fixed to the top cover 12, so that the electrode terminal 40 presses the pole connecting section 213 and the bent section 212 of the pole tab 21 onto the separator 315, and the separator 315 presses the electrode assembly connecting section 211 of the pole tab 21 onto the electrode assembly 20.

[0086] It can be understood that this embodiment improves the structural compactness of the battery cell 100 by pressing the electrode assembly connecting section 211 of the electrode tab 21 between the partition plate 315 and the electrode assembly 20, and by pressing the bending section 212 and the pole connecting section 213 of the electrode tab 21 between the electrode terminal 40 and the partition plate 315, which is beneficial to increase the volume of the electrode assembly 20 of the battery cell 100 and improve the capacity density of the battery cell 100.

[0087] Optionally, in one embodiment, as Figure 2 As shown, Figure 2 for Figure 1 The top view of the partition frame 30 in the figure, the partition plate 315 includes a first partition plate 3151 and a second partition plate 3152, and a through hole 3153 is formed between the first partition plate 3151 and the second partition plate 3152, and one side of the first partition plate 3151 and / or the second partition plate 3152 is integrally connected to the frame body 31, and the other side is suspended, so that the first partition plate 3151 and / or the second partition plate 3152 can be bent upward or downward at a certain angle when squeezed, and can be bent to adapt to electrode assembly connecting sections 211 of different thicknesses or to adapt to bending sections 212 and pole connecting sections 213 of different thicknesses, so that the structure of the battery cell 100 at the position of the pole ear 21 after assembly is more compact.

[0088] It should be noted that the first partition plate 3151 and the second partition plate 3152 can both have one side integrally connected to the frame 31, and the other sides can be suspended. Alternatively, one side of the first partition plate 3151 can be integrally connected to the frame 31, and the other three sides can be suspended, while the second partition plate 3152 can have one side suspended, and the other three sides can be integrally connected to the frame 31. Alternatively, one side of the second partition plate 3152 can be integrally connected to the frame 31, and the other three sides can be suspended, while the first partition plate 3151 can have one side suspended, and the other three sides can be integrally connected to the frame 31.

[0089] Optionally, in one embodiment, as Fig.18 As shown, the top cover 12 is provided with a terminal mounting hole 121 communicating with the mounting cavity 11, and the top cover 12 is also provided with a positioning ring 122 on the peripheral side of the terminal mounting hole 121, and a supporting ring 123 on the inner peripheral wall of the terminal mounting hole 121. Fig.16 As shown, the battery cell 100 also includes an electrode terminal 40, which is supported on a supporting ring 123, and extends into the mounting cavity 11 through a terminal mounting hole 121 to be conductively connected to the pole ear 21 of the electrode assembly 20, and a positioning ring 122 surrounds the outer circumference of the electrode terminal 40 to enable rapid positioning of the electrode terminal 40 during assembly.

[0090] Among them, the positioning ring 122 and the supporting ring 123 are formed by bending part of the cover body of the top cover 12, which can not only support and position the electrode terminal 40, but also make the structure of the top cover 12 simpler and easier to produce, thereby helping to improve production efficiency and reduce production costs.

[0091] Optionally, in one embodiment, as Fig.19 As shown, the battery cell 100 further includes an electrode terminal 40, which includes a welding ring 41, a conductive block 42 and an insulating connector 43. The welding ring 41 is used to be welded and fixed to the top cover 12, and the conductive block 42 is used to be conductively connected to the pole ear 21 on the electrode assembly 20. The insulating connector 43 is connected between the welding ring 41 and the conductive block 42 by injection molding, so that the welding ring 41 and the conductive block 42 are relatively fixed. Among them, the surfaces of the welding ring 41 and the conductive block 42 for connecting with the insulating connector 43 are both provided with a pit structure.

[0092] Specifically, in this embodiment, the electrode terminal 40 further includes a sealing ring 44. The sealing ring 44 and the conductive block 42 are installed in the welding ring 41, and the sealing ring 44 separates the conductive block 42 from the welding ring 41 to avoid conductive contact between the conductive block 42 and the welding ring 41. In order to further fix the relative position between the conductive block 42 and the welding ring 41, in this embodiment, the conductive block 42, the welding ring 41 and the sealing ring 44 are placed in an injection mold, and an insulating connector 43 is molded by injection molding. The insulating connector 43 separates and fixedly connects the conductive block 42 and the welding ring 41.

[0093] That is, the insulating connector 43 is formed by molten plastic attached to the surface of the conductive block 42 and the welding ring 41 and solidified. Therefore, in this embodiment, by providing a pit structure on the surface of the welding ring 41 and the conductive block 42 for connection with the insulating connector 43, the insulating connector 43 can have greater adhesion on the welding ring 41 and the conductive block 42, thereby allowing the welding ring 41 and the conductive block 42 to be connected more stably.

[0094] It should be noted that the pit structures on the surfaces of the welding ring 41 and the conductive block 42 can be etched out by nitric acid, hydrochloric acid, phosphoric acid, sulfuric acid, etc.

[0095] Optionally, in one embodiment, please combine Fig.15 and Fig. 20The shell 10 also includes a bottom cover 14 spaced apart from the top cover 12. A liquid guide channel 141 is provided on the surface of the bottom cover 14 facing the top cover 12, and a liquid injection hole 142 is also provided on the bottom cover 14. The liquid injection hole 142 is used to allow electrolyte to enter and exit the mounting cavity 11 of the shell 10, and the liquid injection hole 142 is connected to the liquid guide channel 141, so that the guide channel can guide the electrolyte to various positions of the electrode assembly 20, thereby better infiltrating the electrode assembly 20.

[0096] After the electrolyte is poured, the injection hole 142 can be sealed with a sealing nail.

[0097] Optionally, since the bottom cover 14 is generally supported by an aluminum material to improve the heat dissipation performance and structural strength of the battery cell 100, but the aluminum bottom cover 14 may be in conductive contact with the electrode assembly 20, in one embodiment, as shown in FIG. Fig.15 As shown, an insulating sheet 50 is further provided between the bottom cover 14 and the electrode assembly 20 to prevent the bottom cover 14 and the electrode assembly 20 from being in conductive contact and causing leakage or short circuit.

[0098] However, because the injection hole 142 is set on the bottom cover 14, in order to avoid the insulating sheet 50 blocking the electrolyte from flowing to the electrode assembly 20, in this embodiment, micropores for electrolyte penetration are provided on the insulating sheet 50, so that the electrolyte can pass through the insulating sheet 50 and infiltrate the electrode assembly 20.

[0099] Alternatively, the liquid-conducting channel 141 may also extend to the side of the bottom cover 14. Fig. 20 As shown, the liquid flows to a transverse flow channel 1411 and a longitudinal flow channel 1412. The transverse flow channel 1411 extends along the length direction of the bottom cover 14, and the two ends of the transverse flow channel 1411 respectively penetrate the two sides in the length direction of the bottom cover 14. The longitudinal flow channel 1412 extends along the width direction of the bottom cover 14, and the two ends of the longitudinal flow channel 1412 respectively penetrate the two sides in the width direction of the bottom cover 14. It can be understood that in this way, the electrolyte can first flow to the side of the bottom cover 14 and then flow to the electrode assembly 20, that is, the electrolyte bypasses the insulating sheet 50 and flows to the electrode assembly 20.

[0100] In a third aspect, an embodiment of the present invention provides a battery pack (not shown), the battery pack comprising a battery cell 100 of any one of the above embodiments. It can be understood that since the battery pack of the present application adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described one by one here.

[0101] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A separator for a battery cell, characterized in that: include: A plurality of racks, wherein the plurality of racks are spaced apart from each other; and An elastic connector is connected between two adjacent frames, and the elastic connector can be compressed and deformed to reduce the distance between the two adjacent frames.

2. The partition frame according to claim 1, characterized in that: The cross-section of the elastic connector is at least one of an obliquely extending "I" shape, "X" shape, "V" shape, inverted "V" shape, "U" shape, inverted "U" shape, "N" shape, inverted "N" shape, "W" shape, and "M" shape.

3. The partition frame according to claim 1, characterized in that: The elastic connecting body and the frame are integrally formed.

4. The partition frame according to claim 1, characterized in that: The frame body has a connecting surface, the elastic connecting body has a connecting end, the connecting end is connected to the connecting surface at an angle, and the angle between the connecting end and the connecting surface is a rounded angle.

5. The partition frame according to claim 1, characterized in that: A plurality of the frame bodies are arranged at intervals along the length direction of the partition frame, and the elastic connector extends integrally along the width direction of the partition frame, or a plurality of the elastic connector bodies are provided, and the plurality of the elastic connector bodies are arranged at intervals along the width direction of the partition frame; And / or, a plurality of the frames are spaced apart along the width direction of the partition frame, and the elastic connector extends integrally along the length direction of the partition frame, or a plurality of the elastic connectors are provided, and the plurality of the elastic connectors are spaced apart along the length direction of the partition frame.

6. The partition frame according to claim 1, characterized in that: The plurality of frames include a main frame and a sub-frame, wherein the main frame and the sub-frame are spaced apart along the length direction of the partition frame, and the length of the main frame is greater than the length of the sub-frame in the length direction of the partition frame; And / or, the plurality of frames include a main frame and a sub-frame, the main frame and the sub-frame are spaced apart along the width direction of the partition frame, and in the width direction of the partition frame, the width of the main frame is greater than the width of the sub-frame.

7. The partition frame according to claim 6, characterized in that: The sub-frame is provided with a weight-reducing groove.

8. A battery cell, characterized in that: include: A housing, wherein a mounting cavity is provided in the housing, and the housing includes a top cover; an electrode assembly, the electrode assembly being disposed in the mounting cavity; and The spacer frame as described in any one of claims 1 to 7, wherein the spacer frame is fixed in the mounting cavity and is located between the electrode assembly and the top cover.

9. The battery cell according to claim 8, characterized in that: One of the inner wall of the installation cavity and the frame is provided with a positioning rib, and the other is provided with a positioning groove at a position corresponding to the positioning rib, and the positioning rib is clamped in the positioning groove.

10. The battery cell according to claim 9, characterized in that: The positioning rib is arranged on the inner wall of the installation cavity, and the positioning rib extends along the height direction of the shell.

11. The battery cell according to claim 8, characterized in that: The top cover is provided with an electrode terminal, the electrode assembly is provided with a pole lug, and the pole lug comprises an electrode assembly connecting section, a bending section and a pole connecting section connected in sequence; A partition plate is provided on the frame, and a through hole is provided on the partition plate. The electrode assembly connecting section is connected to the electrode assembly and is pressed between the electrode assembly and the partition plate. One end of the bent section passes through the through hole and is connected to the electrode assembly connecting section, and the other end of the bent section is connected to the pole connecting section. The pole connecting section is connected to the electrode terminal, and the pole connecting section and the bent section are located between the electrode terminal and the partition plate.

12. The battery cell according to claim 11, characterized in that: The partition plate includes a first partition plate and a second partition plate, the first partition plate and the second partition plate are spaced apart to form the through hole, and one side of the first partition plate and / or the second partition plate is integrally connected to the frame, and the other side is suspended.

13. The battery cell according to claim 8, characterized in that: The top cover is provided with a terminal mounting hole communicating with the mounting cavity, the top cover is also provided with a positioning ring platform on the peripheral side of the terminal mounting hole, and a supporting ring platform is provided on the inner peripheral wall of the terminal mounting hole; The battery cell further includes an electrode terminal, the electrode terminal is supported on the support ring, and the electrode terminal extends into the mounting cavity through the terminal mounting hole, and the positioning ring surrounds the outer circumference of the electrode terminal; Wherein, the positioning ring platform and the supporting ring platform are formed by bending part of the cover body of the top cover.

14. The battery cell according to claim 8, characterized in that: The battery cell further includes an electrode terminal, which includes a welding ring, a conductive block and an insulating connector, wherein the welding ring is used to be welded and fixed to the top cover, the conductive block is used to be conductively connected to the tab on the electrode assembly, and the insulating connector is connected between the welding ring and the conductive block by injection molding; Wherein, the surfaces of the welding ring and the conductive block used for connecting with the insulating connector are both provided with a plurality of pit structures.

15. The battery cell according to claim 8, characterized in that: The top cover is provided with an electrode terminal connected to the electrode assembly, and the shell further includes a bottom cover spaced apart from the top cover, a surface of the bottom cover facing the top cover is provided with a liquid guide channel, and a liquid injection hole is also provided on the bottom cover, and the liquid injection hole is connected to the liquid guide channel.

16. The battery cell according to claim 15, characterized in that: An insulating sheet is also provided between the bottom cover and the electrode assembly; The insulating sheet is provided with micropores for electrolyte penetration, and / or the liquid conducting channel also penetrates to the side of the bottom cover.

17. A battery pack, characterized in that: Comprising a battery cell as described in any one of claims 8 to 16.

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