Pole group assembly and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a pole group assembly and a battery monomer, the pole group assembly comprises a pole group row, a protection frame and a protection assembly, the pole group row comprises a first pole group and a second pole group which are arranged along a first direction, and one side of the first pole group facing the second pole group is provided with a first pole lug and a groove; a second pole lug is arranged on the side, facing the first pole group, of the second pole group, the protection frame is arranged on the periphery of the pole group row in a surrounding mode, a first protection piece of the protection assembly comprises a first connecting part and a first protection part which are connected, and a second protection piece of the protection assembly comprises a second connecting part and a second protection part which are connected; the first connecting part and the second connecting part are both clamped between the first pole group and the second pole group and are both connected with the protection frame, the first protection part and the second protection part are both located in the groove, the first pole lug and the second pole lug are arranged between the first protection part and the second protection part and are in conductive connection, and the capacity of the pole group assembly is high; and the volume is small, and the yield of the battery monomers can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole group component and a battery monomer. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and users have increasingly higher requirements for the performance and safety of lithium-ion batteries.

[0003] The electrode assembly length of existing lithium-ion batteries is relatively short, which is not conducive to increasing the battery's capacity. However, extending the electrode assembly length will reduce the yield rate of lithium-ion batteries. Specifically, existing electrode assemblies are generally heavy and soft. If the electrode assembly length is extended, when the electrode assembly is pushed into the battery case along its length, the thrust applied to the middle and end areas of the electrode assembly is uneven, which can easily cause the middle area of the electrode assembly to bend and deform. In addition, existing battery cases are mostly made of metal materials with thin walls and sharp openings. When the electrode assembly is pushed into the battery case, its outer wall is easily scratched at the battery case opening. Extending the electrode assembly length increases the risk of scratching the electrode assembly.

[0004] Therefore, it is urgent to propose a pole group assembly and a battery cell to solve the above technical problems. Utility Model Content

[0005] The first object of the present invention is to provide a pole group assembly, which has a high capacity and a small volume, and is conducive to improving the yield rate of battery cells.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Electrode assembly, including:

[0008] A pole group row, the pole group row comprising a first pole group and a second pole group arranged along a first direction, a first pole lug and a groove being provided on a side of the first pole group facing the second pole group, and a second pole lug being provided on a side of the second pole group facing the first pole group, wherein the first direction is a lengthwise direction of the first pole group and the second pole group;

[0009] A protective frame is provided on the outer wall of the pole group row and surrounds the outer periphery of the pole group row;

[0010] The protection component includes a first protection member and a second protection member, the first protection member includes a first connecting portion and a first protection portion connected to each other, the second protection member includes a second connecting portion and a second protection portion connected to each other, the first connecting portion and the second connecting portion are both clamped between the first pole group and the second pole group, and the first connecting portion and the second connecting portion are both connected to the protective frame, the first protection portion and the second protection portion are both located in the groove, and the first pole ear and the second pole ear are between the first protection portion and the second protection portion and are conductively connected.

[0011] Optionally, the first protecting portion is provided with a first through slot, the second protecting portion is provided with a second through slot, the first protecting portion and the second protecting portion are snap-fitted together, and the first through slot and the second through slot form an accommodating space, and the first pole tab and the second pole tab are both located in the accommodating space.

[0012] Optionally, the axis of the first through-slot and the axis of the second through-slot are both parallel to the first direction.

[0013] Optionally, two opposite edges of the first through slot are provided with protrusions, and the second protection portion is arranged on the two opposite edges of the first through slot, and the second protection portion is sandwiched between the two protrusions.

[0014] Optionally, a first reinforcing rib is provided on a side of the first protecting portion facing away from the second protecting portion, and the first reinforcing rib is connected to the first connecting portion;

[0015] And / or, a second reinforcing rib is provided on a side of the second protecting portion facing away from the first protecting portion, and the second reinforcing rib is connected to the second connecting portion.

[0016] Optionally, the protective frame includes two end plates and two side plates, the two end plates are respectively located at the two opposite ends of the pole group along the first direction, the two side plates are respectively located on the two opposite side walls of the pole group, and each side plate is connected to a corresponding end plate at both ends in the first direction.

[0017] Optionally, the two side panels are distributed along the second direction, and both ends of the first connection portion in the second direction are respectively connected to a corresponding side panel, and both ends of the second connection portion in the second direction are respectively connected to a corresponding side panel.

[0018] Optionally, one of the sliding groove and the sliding rail is provided on the side facing each other of the two side panels, the sliding groove extends along the third direction, the first connecting part and the second connecting part are both provided with the other of the sliding groove and the sliding rail, the sliding groove and the sliding rail are slidably matched, and the first direction, the second direction and the third direction are perpendicular to each other.

[0019] Optionally, the first protective member and the second protective member are both insulating members, and the first connecting portion is in contact with the second connecting portion.

[0020] A second object of the present invention is to provide a battery cell having a higher capacity, a higher energy density and a higher yield rate.

[0021] To achieve this purpose, the present invention adopts the following technical solutions:

[0022] The battery cell comprises a battery shell, a cover plate and the above-mentioned electrode group assembly. The electrode group assembly is arranged in the battery shell, and the cover plate is arranged at the opening of the battery shell.

[0023] Beneficial effects of the utility model:

[0024] The electrode array includes a first electrode group and a second electrode group arranged along a first direction. A first connecting portion and a second connecting portion are sandwiched between the first electrode group and the second electrode group, and the first connecting portion and the second connecting portion are both connected to a protective frame. The protective frame is disposed on the outer wall of the electrode array and surrounds the outer periphery of the electrode array. When one of the first and second electrode groups is pushed to push the electrode assembly into the battery case in the first direction, the protective frame transmits the pushing force to the first and second connecting portions. The first and second connecting portions then transmit the pushing force to the other of the first and second electrode groups, so that the pushing force applied to the first and second electrode groups is relatively uniform. It can be seen that the electrode assembly improves the capacity of the electrode assembly without extending the first and second electrode groups, and reduces the probability of bending deformation of the first and second electrode groups due to uneven pushing force, thereby improving the yield rate of battery cells. Furthermore, the protective frame surrounding the outer periphery of the electrode array provides good protection for the outer walls of the first and second electrode groups, thereby reducing the probability of the first and second electrode groups being scratched by the battery case. On the other hand, the first pole ear and the second pole ear are both located between the first protecting portion and the second protecting portion. The first protecting portion and the second protecting portion protect the first pole ear and the second pole ear, which can avoid the problem of the first pole ear and the second pole ear being scratched when the pole group assembly is pushed into the battery shell. In addition, the first protecting portion and the second protecting portion are both located in the groove, which has the effect of reducing the volume of the pole group assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the electrode assembly provided by an embodiment of the present utility model;

[0026] Figure 2 This is a schematic structural diagram of the first pole group provided by an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the assembly structure of the protection component and the side panel provided by the embodiment of the utility model Figure 1 ;

[0028] Figure 4This is a schematic diagram of the explosion structure of the protection assembly provided by an embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the assembly structure of the protection component provided by an embodiment of the present utility model;

[0030] Figure 6 This is a schematic diagram of the assembly structure of the protection frame and protection components provided by the embodiment of the utility model Figure 2 ;

[0031] Figure 7 yes Figure 6 A partial enlarged view of the middle part;

[0032] Figure 8 This is a schematic structural diagram of a battery cell provided by an embodiment of the present utility model;

[0033] Figure 9 It is a structural schematic diagram of the cover plate provided by an embodiment of the utility model.

[0034] In the picture:

[0035] 100, pole group row; 110, first pole group; 111, first pole lug; 112, groove; 120, second pole group; 200, protective frame; 210, end plate; 220, side plate; 221, chute; 222, protrusion; 300, protective assembly; 310, first protective member; 311, first connecting portion; 3111, first through-slot; 312, first protective portion; 313, protrusion; 314, first reinforcing rib; 320, second protective member; 321, second connecting portion; 322, second protective portion; 3221, second through-slot; 323, second reinforcing rib; 330, accommodation space;

[0036] 10. Battery case; 11. Second explosion-proof valve; 20. Cover plate; 21. Boss; 22. First explosion-proof valve; 30. Electrode assembly; 40. Insulation film;

[0037] D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0039] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0042] This embodiment provides a pole group assembly, which has a high capacity and a small volume, and is conducive to improving the yield rate of battery cells.

[0043] Specifically, if Figures 1 to 7As shown, the pole group assembly 30 includes a pole group row 100, a protective frame 200 and a protective assembly 300, wherein the pole group row 100 includes a first pole group 110 and a second pole group 120 arranged along a first direction D1, and the first pole group 110 is provided with a first pole ear 111 and a groove 112 on the side facing the second pole group 120, the first pole ear 111 extends from the bottom of the groove 112, and the second pole group 120 extends from the side facing the first pole group 110. A second pole ear (not shown in the figure) is extended. The first direction D1 is the length direction of the first pole group 110 and the second pole group 120. The protective frame 200 is arranged on the outer wall of the pole group row 100, and the protective frame 200 is surrounded by the pole group row 100. Peripherally, the protection assembly 300 includes a first protection member 310 and a second protection member 320. The first protection member 310 includes a first connecting portion 311 and a first protection portion 312 connected to each other. The second protection member 320 includes a second connecting portion 321 and a second protection portion 322 connected to each other. The first connecting portion 311 and the second connecting portion 321 are both clamped between the first pole group 110 and the second pole group 120, and the first connecting portion 311 and the second connecting portion 321 are both connected to the protective frame 200. The first protection portion 312 and the second protection portion 322 are both located in the groove 112. The first pole ear 111 and the second pole ear are between the first protection portion 312 and the second protection portion 322 and are conductively connected.

[0044] Based on the above design, the electrode array 100 includes a first electrode group 110 and a second electrode group 120 arranged along the first direction D1. A first connecting portion 311 and a second connecting portion 321 are sandwiched between the first electrode group 110 and the second electrode group 120, and the first connecting portion 311 and the second connecting portion 321 are both connected to the protective frame 200. The protective frame 200 is arranged on the outer wall of the electrode array 100, and the protective frame 200 is arranged around the outer periphery of the electrode array 100. When one of the first electrode group 110 and the second electrode group 120 is pushed to push the electrode assembly 30 into the battery case 10 along the first direction D1, the protective frame 200 The driving force is transmitted to the first connecting portion 311 and the second connecting portion 321, and then the first connecting portion 311 and the second connecting portion 321 transmit the driving force to the other of the first pole group 110 and the second pole group 120, so that the driving force exerted on the first pole group 110 and the second pole group 120 is relatively uniform. It can be seen that the pole group assembly 30 improves the capacity of the pole group assembly 30 without extending the first pole group 110 and the second pole group 120, and reduces the probability of bending and deformation of the first pole group 110 and the second pole group 120 due to the uneven driving force, which has the effect of improving the yield rate of the battery cell.

[0045] On the other hand, the protective frame 200 surrounding the electrode group array 100 provides good protection for the outer walls of the first electrode group 110 and the second electrode group 120 , thereby reducing the chance of the first electrode group 110 and the second electrode group 120 being scratched by the battery case 10 .

[0046] On the other hand, the first pole ear 111 and the second pole ear are both located between the first protective portion 312 and the second protective portion 322. The first protective portion 312 and the second protective portion 322 protect the first pole ear 111 and the second pole ear, and can avoid the problem of the first pole ear 111 and the second pole ear being scratched when the pole group assembly 30 is pushed into the battery shell 10. In addition, the first protective portion 312 and the second protective portion 322 are both located in the groove 112, which has the effect of reducing the volume of the pole group assembly 30.

[0047] Alternatively, as Figures 1 to 7 As shown, the first protection portion 312 is provided with a first through groove 3111, and the second protection portion 322 is provided with a second through groove 3221. The first protection portion 312 and the second protection portion 322 are snap-fitted and connected, and the first through groove 3111 and the second through groove 3221 form a receiving space 330. The first pole ear 111 and the second pole ear are both located in the receiving space 330 to prevent the first protection portion 312 and the second protection portion 322 from crushing the pole ears.

[0048] Further, if Figures 1 to 7 As shown, the axis of the first through groove 3111 and the axis of the second through groove 3221 are both parallel to the first direction D1, so that the first pole ear 111 and the second pole ear can be extended along the first direction D1 to extend into the accommodating space 330, eliminating the process of bending the first pole ear 111 and the second pole ear, and the first pole ear 111 and the second pole ear that are roughly sheet-shaped can reduce their respective sizes in the first direction D1, and can also reduce the space occupied by the first pole ear 111 and the second pole ear, thereby achieving the effect of reducing the volume of the pole group assembly 30.

[0049] Furthermore, the first pole ear 111 and the second pole ear are fixed by horizontal welding, which directly fixes the first pole ear 111 and the second pole ear so that they are conductively connected, eliminating intermediate conductive elements such as connecting bars. On the one hand, it eliminates the assembly process and connecting elements, and on the other hand, it can reduce the internal resistance between the first pole group 110 and the second pole group 120.

[0050] Alternatively, as Figures 1 to 7 As shown, protrusions 313 are provided on the two opposite edges of the first through groove 3111, and the second protection portion 322 is arranged on the two opposite edges of the first through groove 3111, and the second protection portion 322 is clamped between the two protrusions 313. This structural design can limit the second protection portion 322 and avoid the problem of the second protection portion 322 slipping from the edge of the first through groove 3111.

[0051] Further, if Figures 1 to 7As shown, the protrusion 313 is substantially strip-shaped, and the strip-shaped protrusion 313 extends along the first direction D1 to improve the reliability of the protrusion 313 limiting effect on the second protection portion 322 .

[0052] Alternatively, as Figures 1 to 7 As shown, a first reinforcing rib 314 is provided on the side of the first protecting portion 312 facing away from the second protecting portion 322. The first reinforcing rib 314 is connected to the first connecting portion 311 to improve the connection reliability between the first protecting portion 312 and the first connecting portion 311 and reduce the probability of fracture at the connection between the two. In addition, the first reinforcing rib 314 is arranged on the side of the first protecting portion 312 facing away from the second protecting portion 322, which has the effect of avoiding the first tab 111 and the second tab. A second reinforcing rib 323 is provided on the side of the second protecting portion 322 facing away from the first protecting portion 312. The second reinforcing rib 323 is connected to the second connecting portion 321 to improve the connection reliability between the second protecting portion 322 and the second connecting portion 321 and reduce the probability of fracture at the connection between the two. In addition, the second reinforcing rib 323 is arranged on the side of the second protecting portion 322 facing away from the first protecting portion 312, which has the effect of avoiding the first tab 111 and the second tab.

[0053] In another embodiment, the first reinforcing rib 314 may be provided only between the first protecting portion 312 and the first connecting portion 311 , or the second reinforcing rib 323 may be provided only between the second protecting portion 322 and the second connecting portion 321 .

[0054] Alternatively, as Figures 1 to 7 As shown, the protective frame 200 includes two end plates 210 and two side plates 220. The two end plates 210 are respectively located at the opposite ends of the pole group 100 along the first direction D1, and the two side plates 220 are respectively located on the two opposite side walls of the pole group 100. The two ends of each side plate 220 in the first direction D1 are respectively connected to a corresponding end plate 210, so that the two end plates 210 and the two side plates 220 roughly form a "mouth" shape and are surrounded by the outer wall of the pole group 100.

[0055] Further, if Figures 1 to 7As shown, the two side plates 220 are distributed along the second direction D2, that is, the two side plates 220 are respectively located on the two opposite side walls of the first pole group 110 in the second direction D2, and the two side plates 220 extend from the side wall of the first pole group 110 to the side wall of the second pole group 120 along the first direction D1. The two ends of the first connecting portion 311 in the second direction D2 are respectively connected to the corresponding one of the side plates 220, and the two ends of the second connecting portion 321 in the second direction D2 are respectively connected to the corresponding one of the side plates 220, so as to improve the stability and uniformity of the connection between the first connecting portion 311 and the second connecting portion 321 and the protective frame 200. When pushing one of the first pole group 110 and the second pole group 120 to push the pole group assembly 30 into the battery shell 10 along the first direction D1, the first connecting portion 311 and the second connecting portion 321 can transfer the driving force to the other of the first pole group 110 and the second pole group 120 more stably and evenly, thereby improving the uniformity of the driving force applied to the first pole group 110 and the second pole group 120.

[0056] Furthermore, if Figures 1 to 7 As shown, the two side panels 220 are provided with a slide groove 221 on the side facing each other, and the slide groove 221 extends along the third direction D3. The first connecting portion 311 and the second connecting portion 321 are both provided with a slide rail that slides with the slide groove 221. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other. When the first connecting portion 311, the second connecting portion 321 and the side panel 220 are assembled, the design of the slide groove 221 enables the first connecting portion 311 and the second connecting portion 321 to be quickly positioned and connected to the side panel 220. 0 assembly, and when the electrode group assembly 30 is pushed into the battery shell 10, the side plate 220 transmits the driving force to the first connecting portion 311 and the second connecting portion 321 through the side wall of the slide groove 221. Since the extension direction of the slide groove 221 is the third direction D3 perpendicular to the first direction D1, the side wall of the slide groove 221 can also prevent the first connecting portion 311 and the second connecting portion 321 from being displaced under the action of the driving force, thereby providing a guarantee for improving the uniformity of the force applied to the first electrode group 110 and the second electrode group 120.

[0057] In this embodiment, the first connection part 311 and the second connection part 321 are both sheet-shaped, and the end of the first connection part 311 and the end of the second connection part 321 are the above-mentioned slide rails, thereby achieving the effect of simplifying the structure of the first connection part 311 and the second connection part 321 and saving space.

[0058] In other embodiments, a slide groove 221 may be provided at the end of the first connecting portion 311 and the end of the second connecting portion 321, and a slide rail may be provided on the side plate 220, and the slide rail may slide in cooperation with the slide groove 221 to achieve a rapid assembly effect of the first connecting portion 311, the second connecting portion 321 and the side plate 220. It is understood that in this embodiment, when the electrode assembly 30 is pushed into the battery shell 10, the side plate 220 transmits the driving force to the side walls of the slide groove 221 on the first connecting portion 311 and the second connecting portion 321 through the slide rail, and the slide rail has a limiting effect on the first connecting portion 311 and the second connecting portion 321, preventing the first connecting portion 311 and the second connecting portion 321 from being displaced under the action of the driving force.

[0059] Furthermore, if Figures 1 to 7 As shown, two side panels 220 are provided with two protrusions 222 on the sides facing each other. The two protrusions 222 on the same side panel 220 are spaced apart along the first direction D1, and a slide groove 221 is formed between the two protrusions 222. The two protrusions 222 are the two side walls of the above-mentioned slide groove 221, and the slide groove 221 structure is formed without reducing the structural strength of the side panel 220.

[0060] In this embodiment, the second direction D2 is the width direction of the first pole group 110 and the second pole group 120, and the third direction D3 is the thickness direction of the first pole group 110 and the second pole group 120. That is, the two side plates 220 are respectively located on two opposite side walls of the first pole group 110 in the width direction, and both side plates 220 extend from the side walls of the first pole group 110 to the side walls of the second pole group 120 along the first direction D1. Of course, in other embodiments, the second direction D2 may also be the thickness direction of the first pole group 110 and the second pole group 120, and the third direction D3 may be the width direction of the first pole group 110 and the second pole group 120. In this case, the two side plates 220 are respectively located on two opposite side walls of the first pole group 110 in the thickness direction, and both side plates 220 extend from the side walls of the first pole group 110 to the side walls of the second pole group 120 along the first direction D1.

[0061] Optionally, one of the two end plates 210 is fixedly connected to the side of the first pole group 110 facing away from the second pole group 120 by gluing or hot melting, and the other of the two end plates 210 is fixedly connected to the side of the second pole group 120 facing away from the first pole group 110 by gluing or hot melting.

[0062] Optionally, the first protective member 310, the second protective member 320 and the protective frame 200 are all insulating members, and the first connecting portion 311 fits in contact with the second connecting portion 321. The first connecting portion 311 and the second connecting portion 321 completely separate the first pole group 110 from the second pole group 120, thereby preventing the first pole group 110 and the second pole group 120 from causing a short circuit due to accidental touch during transportation or use.

[0063] Furthermore, the first protective member 310 , the second protective member 320 and the protective frame 200 can be manufactured using a relatively mature process in the art, such as injection molding.

[0064] In this embodiment, the groove 112 has a groove depth of W1, and the lengths of the first protective portion 312 and the second protective portion 322 in the first direction D1 are both W2, 0.3mm<(W1-W2)<4mm. For example, the difference between W1 and W2 can be 0.3mm, 0.5mm, 2mm, 3mm or 4mm, etc. If the difference between W1 and W2 is too small, the first protective portion 312 and the second protective portion 322 may easily squeeze the bottom of the groove 112, and then the first pole group 110 may be crushed. If the difference between W1 and W2 is too large, the volume of the pole group assembly 30 will be wasted, which is not conducive to improving the energy density of the pole group assembly 30.

[0065] In this embodiment, the dimensions of the first connecting portion 311 and the second connecting portion 321 in the first direction D1 are both L1, the groove width of the slide groove 221 is L2, 0.6mm<L1≤L2<2mm, illustratively, L1 can be 0.65mm, 0.7mm, 0.8mm or 1mm, etc., and L2 can be 1mm, 1.5mm or 1.8mm, etc., so that the first connecting portion 311 and the second connecting portion 321 can slide into the slide groove 221 more easily without taking up too much space.

[0066] In this embodiment, the dimension of the protrusion 222 protruding from the surface of the side plate 220 is H, 0.5mm<H<6mm. For example, H can be 0.5mm, 1mm, 2mm, 3mm, 5mm or 6mm, etc. If H is too small, the structural strength of the protrusion 222 is low, and it cannot provide a reliable limiting effect on the first connecting portion 311 and the second connecting portion 321. If H is too large, it will take up too much space, which is not conducive to improving the energy density of the electrode group assembly 30.

[0067] This embodiment also provides a battery cell, such as Figure 8As shown, the battery cell includes a battery shell 10, a cover plate 20 and the above-mentioned electrode group assembly 30. The electrode group assembly 30 is arranged in the battery shell 10, and the cover plate 20 covers the opening of the battery shell 10. The battery cell adopts the above-mentioned electrode group assembly 30, has a higher capacity and a higher energy density, and during the production process, when the electrode group assembly 30 is installed in the battery shell 10, the probability of bending, deformation and scratching of the first electrode group 110 and the second electrode group 120 is low, and the probability of scratching the first electrode ear 111 and the second electrode ear is low, thereby making the battery cell have a higher yield rate.

[0068] Alternatively, as Figure 8 As shown, the battery cell further includes an insulating film 40 , which is wrapped around the outside of the electrode group assembly 30 to achieve insulation between the electrode group assembly 30 and the battery shell 10 .

[0069] Alternatively, as Figure 8 and Figure 9 As shown, the battery shell 10 is provided with two openings, and the cover plates 20 are provided with two, and the two cover plates 20 are respectively covered on the corresponding openings. The cover plate 20 is made of conductive materials such as smooth aluminum sheets. The side of the cover plate 20 facing the battery shell 10 is electrically connected to the first pole group 110 or the second pole. The side of the cover plate 20 facing away from the battery shell 10 is provided with a boss 21, and the boss 21 is used to connect with other conductive elements outside the battery cell. This structural design can simplify the overall structure of the cover plate 20, eliminate conventional poles, upper plastics, lower plastics and other cover plate 20 parts, improve space utilization and reduce production costs. It should be pointed out that in this embodiment, the protective frame 200 is an insulating part, and the end plate 210 can insulate the pole group assembly 30 and the cover plate 20 to prevent the two from contacting and causing a short circuit.

[0070] Further, if Figure 8 and Figure 9 As shown, a first explosion-proof valve 22 is provided on the cover plate 20, a gap is left between the side plate 220 and the inner wall of the battery shell 10, and a gap is left between the electrode group assembly 30 and the cover plate 20, so that an annular exhaust flow channel is formed on the periphery of the electrode group assembly 30. When high-pressure gas is generated inside the first electrode group 110 and / or the second electrode group 120, the high-pressure gas flows in the exhaust flow channel to the first explosion-proof valve 22 and is discharged, ensuring the safety of the battery cell.

[0071] Furthermore, if Figure 8 and Figure 9As shown, a second explosion-proof valve 11 is provided on the battery shell 10, and the second explosion-proof valve 11 is located in the middle position of the battery shell 10 in the first direction D1. When the high-pressure gas in the annular exhaust channel flows to the second explosion-proof valve 11, it can also be discharged from the second explosion-proof valve 11. This structural design increases the passage for high-pressure gas to discharge from the battery shell 10 and shortens the exhaust path of the high-pressure gas, which has the effect of improving the safety of battery monomer use.

[0072] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pole group assembly, characterized in that: include: A pole group row (100), the pole group row (100) comprising a first pole group (110) and a second pole group (120) arranged along a first direction (D1), a first pole lug (111) and a groove (112) being provided on a side of the first pole group (110) facing the second pole group (120), a second pole lug being provided on a side of the second pole group (120) facing the first pole group (110), and the first direction (D1) being the length direction of the first pole group (110) and the second pole group (120); A protective frame (200), the protective frame (200) being arranged on the outer wall of the electrode group (100), and the protective frame (200) being arranged around the outer periphery of the electrode group (100); A protection component (300) includes a first protection member (310) and a second protection member (320), wherein the first protection member (310) includes a first connection portion (311) and a first protection portion (312) connected to each other, and the second protection member (320) includes a second connection portion (321) and a second protection portion (322) connected to each other, wherein the first connection portion (311) and the second connection portion (321) are both sandwiched between the first pole group (110) and the second pole group (120), and the first connection portion (311) and the second connection portion (321) are both connected to the protection frame (200), the first protection portion (312) and the second protection portion (322) are both located in the groove (112), and the first pole lug (111) and the second pole lug are between the first protection portion (312) and the second protection portion (322) and are conductively connected.

2. The pole group assembly according to claim 1, characterized in that: The first protection portion (312) is provided with a first through-slot (3111), and the second protection portion (322) is provided with a second through-slot (3221). The first protection portion (312) and the second protection portion (322) are snap-fitted and connected, and the first through-slot (3111) and the second through-slot (3221) form an accommodating space (330). The first pole tab (111) and the second pole tab are both located in the accommodating space (330).

3. The pole group assembly according to claim 2, characterized in that: The axis of the first through groove (3111) and the axis of the second through groove (3221) are both parallel to the first direction (D1).

4. The pole group assembly according to claim 2, characterized in that: The opposite side edges of the first through slot (3111) are both provided with protrusions (313), the second protection portion (322) is arranged on the opposite side edges of the first through slot (3111), and the second protection portion (322) is sandwiched between the two protrusions (313).

5. The pole group assembly according to any one of claims 1 to 4, characterized in that: A first reinforcing rib (314) is provided on a side of the first protecting portion (312) facing away from the second protecting portion (322), and the first reinforcing rib (314) is connected to the first connecting portion (311); And / or, a second reinforcing rib (323) is provided on a side of the second protecting portion (322) facing away from the first protecting portion (312), and the second reinforcing rib (323) is connected to the second connecting portion (321).

6. The pole group assembly according to any one of claims 1 to 4, characterized in that: The protective frame (200) comprises two end plates (210) and two side plates (220), the two end plates (210) being respectively located at opposite ends of the pole group (100) along the first direction (D1), the two side plates (220) being respectively located on opposite side walls of the pole group (100), and the two ends of each side plate (220) in the first direction (D1) being respectively connected to a corresponding end plate (210).

7. The pole group assembly according to claim 6, characterized in that: The two side panels (220) are distributed along the second direction (D2), the two ends of the first connecting portion (311) in the second direction (D2) are respectively connected to a corresponding one of the side panels (220), and the two ends of the second connecting portion (321) in the second direction (D2) are respectively connected to a corresponding one of the side panels (220).

8. The pole group assembly according to claim 7, characterized in that: The two side panels (220) are provided with a slide groove (221) and one of the slide rails on the sides facing each other, the slide groove (221) extends along the third direction (D3), the first connecting portion (311) and the second connecting portion (321) are both provided with the slide groove (221) and the other of the slide rails, the slide groove (221) is slidably matched with the slide rail, and the first direction (D1), the second direction (D2) and the third direction (D3) are perpendicular to each other.

9. The pole group assembly according to claim 8, characterized in that: The first protection member (310) and the second protection member (320) are both insulating members, and the first connecting portion (311) and the second connecting portion (321) are in contact with each other.

10. A battery cell, characterized in that The invention comprises a battery shell (10), a cover plate (20), and a pole group assembly (30) according to any one of claims 1 to 9, wherein the pole group assembly (30) is arranged in the battery shell (10), and the cover plate (20) is arranged to cover the opening of the battery shell (10).

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