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 single battery, the pole group assembly comprises a first pole group, a second pole group and a supporting element, the first pole group and the second pole group are arranged along a first direction, the first direction is the length direction of the first pole group and the second pole group, and the supporting element is arranged on the first pole group. A first pole lug extends out of one end, facing the second pole group, of the first pole group, a second pole lug extends out of one end, facing the first pole group, of the second pole group, the supporting element comprises a partition part and a supporting part which are connected, and the partition part extends from the outer wall of the first pole group to the outer wall of the second pole group in the first direction; the supporting part is clamped between the first pole group and the second pole group, the first pole lug and the second pole lug are conductively connected and are both positioned in the supporting part, the pole group assembly has lower production difficulty and higher energy density, when the pole group assembly is arranged in a battery shell, the probability of deformation of the first pole group, the second pole group, the first pole lug and the second pole lug is lower, and the energy density is higher. And the probability that the first pole group and the second pole group are scratched is low.

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 a common energy storage device, power batteries such as lithium-ion batteries and sodium-ion batteries are widely used in the energy supply systems of electric vehicles. As the energy density and safety requirements of power batteries gradually increase, the use and development of longer power batteries are also gaining more and more attention.

[0003] As the length of the power battery increases, the length of the battery case and the electrode group will also increase, but the production of long electrode groups is difficult, and the long electrode group is easily reduced when the long electrode group is placed in the long battery case. Specifically, when the electrode group is placed in the battery case, the electrode group is pushed into the battery case from the opening at one end in the length direction of the battery case. Since the battery case is mostly made of metal material with thin walls and sharp openings, and the existing electrode group is heavy and soft in texture, when the electrode group is pushed into the battery case, the electrode group is easily scratched at the opening of the battery case; and when the electrode group is pushed, the friction between the electrode group and the inner wall of the battery case easily causes the long electrode group to bend and deform, thereby reducing the yield of the battery.

[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 utility model is to provide a pole group assembly, which has low production difficulty and high energy density. When the pole group assembly is installed in a battery shell, the probability of deformation of the first pole group, the second pole group, the first pole tab and the second pole tab is low, and the probability of scratching the first pole group and the second pole group is low.

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

[0007] Electrode assembly, including:

[0008] A first pole group and a second pole group, the first pole group and the second pole group are arranged along a first direction, the first direction being the length direction of the first pole group and the second pole group, a first pole tab extending from one end of the first pole group toward the second pole group, a second pole tab extending from one end of the second pole group toward the first pole group, the first pole tab being conductively connected to the second pole tab;

[0009] The supporting element includes a partition portion and a supporting portion, the partition portion extends along a first direction from the outer wall of the first pole group to the outer wall of the second pole group, the supporting portion is connected to the partition portion, the supporting portion is clamped between the first pole group and the second pole group, and the first pole ear and the second pole ear are both located in the supporting portion.

[0010] Optionally, a receiving groove is provided on the side of the support portion away from the barrier portion, and two opposite side walls of the receiving groove are provided with through holes, and the first pole ear and the second pole ear are respectively passed through a corresponding through hole to the receiving groove, and the first pole ear and the second pole ear are fixedly connected in the receiving groove.

[0011] Optionally, two side walls of the accommodating groove that are opposite to each other in the first direction are both provided with through holes, and the first electrode tab and the second electrode tab both extend along the first direction.

[0012] Optionally, there are two supporting elements, and the edge of the receiving groove of one of the two supporting elements fits with the edge of the receiving groove of the other, and the through hole extends to the edge of the receiving groove.

[0013] Optionally, a vent hole is provided at the bottom of the accommodating groove, and the vent hole extends to a side of the barrier portion facing away from the supporting portion.

[0014] Optionally, the end surface of the first pole group facing away from the second pole group and / or the end surface of the second pole group facing away from the first pole group is a pushing surface, a pushing plate is provided on the pushing surface, and the orthographic projection of the pushing plate on the pushing surface is equal to the surface area of the pushing surface.

[0015] Optionally, the barrier portion is detachably connected to the push plate.

[0016] Optionally, the supporting element further includes a limiting portion, which is connected to one end of the barrier portion facing the push plate, and abuts against a side of the push plate facing away from the pushing surface.

[0017] Optionally, a slot is provided on the side wall of the push plate, and the barrier portion close to the limiting portion is snapped into the slot.

[0018] A second object of the present invention is to provide a battery cell having higher energy density, lower production difficulty and higher yield.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] The battery cell comprises a battery shell, a cover plate assembly and the above-mentioned electrode group assembly. The electrode group assembly is arranged in the battery shell, and the cover plate assembly is covered at the opening of the battery shell.

[0021] Beneficial effects of the utility model:

[0022] In actual production, a shorter first and second electrode groups are produced, and then the first and second electrode groups are arranged along their lengths, with the first and second electrode tabs electrically connected. This eliminates the need to produce longer electrode groups, reducing production complexity. Furthermore, the electrode assembly formed by splicing the first and second electrode groups is longer, which improves the energy density of the electrode assembly. Secondly, the barrier portion of the support element extends from the outer wall of the first electrode group to the outer wall of the second electrode group along the first direction, thereby protecting the first and second electrode groups and reducing the chance of the electrode assembly being scratched by the battery case when the electrode assembly is installed, thereby improving the yield rate of the battery cells. Thirdly, the support portion of the support element is sandwiched between the first and second electrode groups. When the electrode assembly is installed in the battery case along the first direction, the support portion supports the first and second electrode groups, thereby improving the structural strength of the electrode assembly and reducing the chance of bending and deformation of the first and second electrode groups. Furthermore, the first pole ear and the second pole ear are both located in the support portion, which protects the first pole ear and the second pole ear. When the pole group assembly is installed into the battery shell along the first direction, the deformation or breakage of the first pole ear and the second pole ear can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the electrode assembly provided by an embodiment of the present utility model;

[0024] Figure 2 This is a schematic structural diagram of the electrode group assembly provided by an embodiment of the present invention, excluding the second electrode group;

[0025] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle;

[0026] Figure 4 It is a structural schematic diagram of a support element provided by an embodiment of the present utility model;

[0027] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle;

[0028] Figure 6 yes Figure 1 A partial enlarged view of the middle part;

[0029] Figure 7 This is a schematic structural diagram of a push plate provided by an embodiment of the present utility model;

[0030] Figure 8 This is a partially enlarged structural diagram of a support element provided by an embodiment of the present utility model;

[0031] Figure 9This is a schematic diagram of the explosion structure of a battery cell provided by an embodiment of the present utility model;

[0032] Figure 10 This is a partially enlarged structural diagram of an explosion-proof valve provided in an embodiment of the present utility model;

[0033] Figure 11 It is a structural schematic diagram of the first cover plate assembly provided in an embodiment of the present utility model.

[0034] In the picture:

[0035] 110, first electrode group; 111, first electrode tab; 120, second electrode group; 210, barrier portion; 220, support portion; 221, receiving groove; 222, through hole; 223, exhaust hole; 230, limit portion; 300, push plate; 310, slot;

[0036] 10. Battery case; 11. Opening; 12. Explosion-proof valve; 20. Insulation film; 21. Avoidance hole; 30. First cover assembly; 31. First cover body; 32. Boss; 40. Second cover assembly;

[0037] D1, first 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 an electrode group assembly having low production difficulty and high energy density. When the electrode group assembly is installed in a battery shell, the probability of deformation of the first electrode group, the second electrode group, the first electrode tab and the second electrode tab is low, and the probability of scratching the first electrode group and the second electrode group is low.

[0043] Specifically, if Figures 1 to 3 As shown, the electrode group assembly includes a first electrode group 110, a second electrode group 120 and a supporting element, wherein the first electrode group 110 and the second electrode group 120 are arranged along a first direction D1, and the first direction D1 is the length direction of the first electrode group 110 and the second electrode group 120. The first electrode group 110 has a first electrode ear 111 extending toward one end of the second electrode group 120, and the second electrode group 120 has a second electrode ear (not shown in the figure) extending toward one end of the first electrode group 110. The first electrode ear 111 is conductively connected to the second electrode ear. The supporting element includes a barrier portion 210 and a supporting portion 220. The barrier portion 210 extends from the outer wall of the first electrode group 110 to the outer wall of the second electrode group 120 along the first direction D1. The supporting portion 220 is connected to the barrier portion 210. The supporting portion 220 is sandwiched between the first electrode group 110 and the second electrode group 120. The first electrode ear 111 and the second electrode ear are both located in the supporting portion 220.

[0044] In actual production, a shorter first electrode group 110 and a shorter second electrode group 120 are produced, and then arranged along their lengths, with the first electrode tab 111 and the second electrode tab electrically connected. This eliminates the need to produce a longer electrode group, which helps reduce production difficulty. Furthermore, the electrode assembly formed by splicing the first electrode group 110 and the second electrode group 120 is longer, which has the effect of increasing the energy density of the electrode assembly. Secondly, the barrier portion 210 of the support element extends along the first direction D1 from the outer wall of the first electrode group 110 to the outer wall of the second electrode group 120, thereby protecting the first electrode group 110 and the second electrode group 120 and reducing the chance of the first electrode group 110 and the second electrode group 120 being scratched by the battery shell 10 when the electrode assembly is installed, thereby improving the yield rate of the battery cells. Thirdly, the support portion 220 of the support element is sandwiched between the first electrode group 110 and the second electrode group 120. When the electrode group assembly is installed into the battery case 10 along the first direction D1, the support portion 220 can provide support for the first electrode group 110 and the second electrode group 120, thereby improving the structural strength of the electrode group assembly and reducing the probability of bending and deformation of the first electrode group 110 and the second electrode group 120. Furthermore, the first electrode tab 111 and the second electrode tab are both located within the support portion 220, providing protection for the first electrode tab 111 and the second electrode tab. This prevents deformation or breakage of the first electrode tab 111 and the second electrode tab when the electrode group assembly is installed into the battery case 10 along the first direction D1.

[0045] In this embodiment, the support element is made by injection molding, which is a common production process in this field and can also make the support element have better insulation properties.

[0046] Furthermore, if Figures 1 to 5 As shown, a receiving groove 221 is provided on the side of the support portion 220 facing away from the barrier portion 210. The two opposing side walls of the receiving groove 221 are each provided with a through-hole 222. The first pole tab 111 and the second pole tab are respectively inserted through a corresponding through-hole 222 into the receiving groove 221, so that the support portion 220 protects the first pole tab 111 and the second pole tab. Furthermore, the first pole tab 111 and the second pole tab are fixedly connected within the receiving groove 221 to achieve a conductive connection between the first pole tab 111 and the second pole tab. In this embodiment, the first pole tab 111 and the second pole tab are directly contacted and connected, eliminating the need for a conductive connector such as a copper busbar between the first pole tab 111 and the second pole tab. This not only reduces the weight of the pole assembly, but also reduces the resistance between the first pole assembly 110 and the second pole assembly 120, thereby reducing the internal resistance of the pole assembly.

[0047] Furthermore, if Figures 1 to 5As shown, the two side walls of the receiving groove 221 opposite to each other in the first direction D1 are each provided with a through hole 222. The first electrode tab 111 and the second electrode tab both extend along the first direction D1. That is, the first electrode tab 111 and the second electrode tab do not need to be bent. The two are generally sheet-like structures, and the two can be in surface contact and fixedly connected. This structural design eliminates the process of bending the first electrode tab 111 and the second electrode tab, and can also save the space occupied by the first electrode tab 111 and the second electrode tab, thereby achieving the effect of reducing the volume of the electrode assembly. In this embodiment, the sheet-like first electrode tab 111 and the sheet-like second electrode tab are fixedly connected by horizontal welding. This process is relatively common and relatively simple in the field, which can improve production efficiency and reduce production costs.

[0048] Alternatively, as Figures 1 to 5 As shown, a vent hole 223 is provided at the bottom of the accommodating groove 221, and the vent hole 223 extends to the side of the barrier portion 210 away from the support portion 220. When high-pressure gas is generated inside the first pole group 110 and / or the second pole group 120, the high-pressure gas enters the accommodating groove 221 through the through hole 222, and then passes through the vent hole 223 to the gap between the pole group assembly and the inner wall of the battery shell 10, and finally is discharged from the explosion-proof valve 12 on the battery shell 10. It can be seen that the through hole 222, the accommodating groove 221 and the vent hole 223 form a flow channel for high-pressure gas, so that the high-pressure gas in the first pole group 110 and / or the second pole group 120 can be discharged from the gap between the first pole group 110 and the second pole group 120.

[0049] Alternatively, as Figures 1 to 5As shown, there are two supporting elements. Among the two supporting elements, the barrier portion 210 of one and the barrier portion 210 of the other are arranged opposite to each other, so that the two opposite outer walls of the first pole group 110 and the two opposite outer walls of the second pole group 120 are both provided with barrier portions 210, which play a role in protecting the two opposite outer walls of the first pole group 110 and the two opposite outer walls of the second pole group 120. In the two supporting elements, the notch of the accommodating groove 221 of one is arranged opposite to the notch of the accommodating groove 221 of the other, and the edges of the two accommodating grooves 221 are fitted together, and the through hole 222 extends to the edge of the accommodating groove 221. In actual production, after the first pole ear 111 and the second pole ear are welded, the two supporting elements are respectively located on the opposite sides of the first pole group 110 (and the second pole group 120), and then the supporting parts 220 on the two supporting elements are aligned with the gap between the first pole group 110 and the second pole group 120, and the notches of the accommodating grooves 221 on the two supporting elements are arranged opposite to each other, and then the two supporting parts 220 are pushed into the gap between the first pole group 110 and the second pole group 120 until the partition part 210 is fitted with the outer wall of the first pole group 110 and the outer wall of the second pole group 120. In this way, the assembly of the first pole group 110, the second pole group 120 and the two supporting elements is completed. It can be seen that this structural design simplifies the first The assembly process of the first pole group 110, the second pole group 120 and the two supporting elements has the effect of improving production efficiency; after the notches of the two accommodating grooves 221 are fitted together, the end face of the first pole group 110 facing the second pole group 120 blocks the through hole 222 facing the side of the first pole group 110, and the end face of the second pole group 120 facing the first pole group 110 blocks the through hole 222 facing the side of the second pole group 120, so that the two supporting parts 220, the first pole group 110 and the second pole group 120 cooperate to completely wrap the first pole ear 111 and the second pole ear, thereby improving the protection effect of the first pole ear 111 and the second pole ear; in addition, the two barrier parts 210 respectively play the role of protective barriers for the two opposite outer walls of the first pole group 110 and the two opposite outer walls of the second pole group 120, further reducing the probability of the first pole group 110 and the second pole group 120 being scratched by the battery shell 10 when the pole group assembly is installed in the battery shell 10.

[0050] Alternatively, as Figures 1 to 5 As shown, the end surface of the second electrode assembly 120 facing away from the first electrode assembly 110 serves as a pushing surface. A push plate 300 is provided on the pushing surface, and the orthographic projection of the push plate 300 on the pushing surface is equal to the surface area of the pushing surface. In actual production, the electrode assembly can be pushed into the battery case 10 along the first direction D1 by pushing the push plate 300. The push plate 300 is in surface-to-surface contact with the pushing surface, and the orthographic projection of the push plate 300 on the pushing surface is equal to the surface area of the pushing surface. Therefore, when the push plate 300 is pushed, the push plate 300 can distribute the pushing force to the pushing surface, avoiding damage to the pushing surface due to excessive local pressure.

[0051] In another embodiment, the end surface of the first pole group 110 facing away from the second pole group 120 is a pushing surface, and the pushing plate 300 is disposed on the pushing surface of the first pole group 110 .

[0052] In another embodiment, the end surface of the first electrode group 110 facing away from the second electrode group 120 and the end surface of the second electrode group 120 facing away from the first electrode group 110 are both pushing surfaces, and each pushing surface is provided with a push plate 300. When the electrode group assembly is loaded into the battery shell 10, the first electrode group 110 and the second electrode group 120 can be selectively pushed, thereby improving assembly flexibility.

[0053] Furthermore, the push plate 300 is an element with insulation properties such as an injection molded part.

[0054] Optionally, the barrier 210 and the push plate 300 are detachably connected, and the support element is connected to the push plate 300. This improves the stability of the connection between the support element and the first and second pole groups 110, 120, and also improves the stability of the connection between the push plate 300 and the pushing surface of the second pole group 120. Furthermore, the detachable connection allows for greater flexibility in the assembly of the support element and the push plate 300, facilitating not only assembly but also disassembly when replacement is required.

[0055] Furthermore, if Figures 1 to 6 As shown, the support element also includes a limiting portion 230, which is connected to one end of the barrier portion 210 toward the push plate 300, and the limiting portion 230 abuts against the side of the push plate 300 away from the pushing surface. The push plate 300 is clamped between the limiting portion 230 and the pushing surface to achieve the connection between the support element and the push plate 300, and can also make the push plate 300 close to the pushing surface. When disassembly is required, the limiting portion 230 is gently bent in the direction away from the pushing surface, and the push plate 300 is removed from between the limiting portion 230 and the pushing surface, so that the support element and the push plate 300 can be disassembled.

[0056] Furthermore, if Figures 1 to 7 As shown, the side wall of the push plate 300 is provided with a card slot 310, and the barrier portion 210 close to the limiting portion 230 is clamped in the card slot 310. On the one hand, it can expand the abutment area between the limiting portion 230 and the push plate 300, and improve the reliability of the connection between the supporting element, the push plate 300 and the second pole group 120. On the other hand, it can ensure that the barrier portion 210 close to the push plate 300 is parallel to the outer wall of the second pole group 120 without increasing the thickness of the barrier portion 210, thereby achieving the effect of improving the overall structural consistency of the pole group assembly while reducing the volume of the pole group assembly.

[0057] Alternatively, as Figure 8As shown, the dimension of the limiting portion 230 protruding from the barrier portion 210 is a, and the width of the limiting portion 230 is b, 1mm<a<6mm, illustratively, a can be 1mm, 2mm, 3mm, 5mm or 6mm, etc., 0.5mm<b<4mm, illustratively, b can be 0.5mm, 1mm, 2mm, 3mm or 4mm, etc., while minimizing the volume of the limiting portion 230, it can also ensure that the limiting portion 230 has sufficient structural strength to improve the reliability of the abutment relationship between the limiting portion 230 and the push plate 300.

[0058] Alternatively, as Figure 8 As shown, the thickness of the barrier portion 210 is c, 0.5 mm < c < 5 mm. For example, c can be 0.5 mm, 1 mm, 3 mm, 4 mm or 5 mm, etc., which can minimize the volume of the barrier portion 210 while ensuring that the barrier portion 210 has sufficient structural strength to improve the reliability of protecting the outer wall of the first pole group 110 and the outer wall of the second pole group 120.

[0059] The pole group assembly provided in this embodiment has the support portions 220 of the two support elements relatively inserted in the gap between the first pole group 110 and the second pole group 120, so that the first pole ear 111 and the second pole ear are located in the accommodating grooves 221 of the two support portions 220, and the push plate 300 is in contact with the pushing surface of the second pole group 120, and the limiting portions 230 of the two support elements are in contact with the side of the push plate 300 away from the pushing surface to realize the assembly of the two support elements, the first pole group 110, the second pole group 120 and the push plate 300. When the two support elements and the push plate 300 need to be disassembled, the limiting portions 230 are bent in the direction away from the pushing surface, the push plate 300 is removed, and then the support portions 220 of the two support elements are removed from the gap between the first pole group 110 and the second pole group 120. It can be seen that the pole group assembly provided in this embodiment has a simple structure and is easy to disassemble and assemble, which is conducive to improving production efficiency and reducing production difficulty.

[0060] This embodiment also provides a battery cell having high energy density, low production difficulty and high yield.

[0061] Specifically, if Figure 9As shown, the battery cell includes a battery shell 10, a cover plate assembly, and the above-mentioned electrode group assembly. The electrode group assembly is arranged in the battery shell 10, and the cover plate assembly is covered at the opening 11 of the battery shell 10. The battery cell adopts the above-mentioned electrode group assembly, and a first electrode group 110 and a second electrode group 120 are provided in the battery shell 10. Compared with a battery cell with only one electrode group, the battery cell provided in this embodiment has a higher energy density. Moreover, compared with inserting a longer electrode group into the battery shell 10, it is less difficult to insert the first electrode group 110 and the second electrode group 120 with the support portion 220 sandwiched therebetween into the battery shell 10, thereby reducing the difficulty of producing the battery cell; at the same time, when the electrode group assembly is inserted into the battery shell 10, the probability of the first electrode group 110 and the second electrode group 120 being scratched by the battery shell 10 is low, and the probability of the first electrode group 110 and the second electrode group 120 being bent and deformed and the probability of the first electrode tab 111 and the second electrode tab being deformed or broken is low, thereby improving the yield of the battery cell.

[0062] Alternatively, as Figure 9 As shown, the battery cell also includes an insulating film 20, which wraps around the outside of the first electrode group 110 and the second electrode group 120 to provide insulation. Furthermore, a portion of the insulating film 20 is sandwiched between the barrier 210 and the outer wall of the first electrode group 110, and a portion of the insulating film 20 is sandwiched between the barrier 210 and the outer wall of the second electrode group 120. Furthermore, a clearance hole 21 is provided on the insulating film 20 directly opposite the support portion 220, facilitating the support portion 220 to pass through the clearance hole 21 and be inserted into the gap between the first electrode group 110 and the second electrode group 120.

[0063] Alternatively, as Figure 9 As shown, two explosion-proof valves 12 are provided on the battery shell 10, and one explosion-proof valve 12 is located in the middle position of the first pole group 110, and the other explosion-proof valve 12 is located in the middle position of the second pole group 120. Compared with setting the explosion-proof valve 12 on the cover assembly, the technical solution provided in this embodiment is conducive to shortening the flow stroke of the high-pressure gas. When the high-pressure gas discharged from the exhaust hole 223 flows to the middle position of the first pole group 110 and / or the middle position of the second pole group 120, it can be discharged from the battery shell 10 from the explosion-proof valve 12, achieving the effect of rapid exhaust, thereby improving the safety of the battery cell.

[0064] Furthermore, if Figure 9 and Figure 10As shown, the width of the explosion-proof valve 12 is e, 7mm<e<55mm, and for example, e can be 7mm, 8mm, 20mm, 35mm, 50mm or 55mm, etc. The length of the explosion-proof valve 12 is d, 15mm<d<95mm, and for example, d can be 15mm, 20mm, 45mm, 60mm, 88mm or 95mm, etc. This size design can not only expand the surface area of the explosion-proof valve 12 as much as possible, thereby improving the exhaust efficiency, but also ensure the structural strength of the battery shell 10 located around the explosion-proof valve 12.

[0065] Alternatively, as Figure 9 and Figure 11 As shown, the battery case 10 is provided with openings 11 at both ends opposite each other in a first direction D1 (i.e., the lengthwise direction). One of the two cover plate assemblies is a first cover plate assembly 30, and the other is a second cover plate assembly 40. The first cover plate assembly 30 includes a first cover plate body 31, which is a conductive member such as a plain aluminum plate. The first cover plate body 31 is provided to cover the opening 11 near the first electrode group 110. A third electrode tab (not shown) extends from the end of the first electrode group 110 facing away from the second electrode group 120. The side of the first cover plate body 31 facing the first electrode group 110 is welded to the third electrode tab to achieve a conductive connection. A boss 32 is provided on the side of the first cover plate body 31 facing away from the first electrode group 110. The boss 32 is used to electrically connect to an external conductive element (e.g., a boss 32 or a terminal of another battery cell). This structural design can simplify the overall structure of the first cover plate assembly 30, eliminating conventional cover plate parts such as the terminal, upper plastic, and lower plastic, thereby improving space utilization while reducing production costs.

[0066] Furthermore, the first cover plate assembly 30 also includes an insulating sticker (not shown in the figure), which is attached to a surface of the first cover plate body 31 facing the first pole group 110 to achieve insulation between the first cover plate body 31 and the first pole group 110 .

[0067] Furthermore, the second cover plate assembly 40 is a conventional cover plate assembly structure in the field. Exemplarily, the second cover plate assembly 40 includes a second cover plate body, a pole, a pressure block, an upper plastic and a lower plastic, wherein the second cover plate body is covered at the opening 11 near the second pole group 120, the pole is sealed and penetrated through the second cover plate body, and a fourth pole ear extends from the end of the second pole group 120 facing away from the first pole group 110. The fourth pole ear is penetrated through the push plate 300 and welded to the pole to achieve conductive connection. The pressure block is connected to the side of the second cover plate body facing away from the second pole group 120 through the upper plastic, and the pressure block is connected to the pole, and the lower plastic covers the side of the second cover plate body facing the second pole group 120.

[0068] 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 first pole group (110) and a second pole group (120), wherein the first pole group (110) and the second pole group (120) are arranged along a first direction (D1), wherein the first direction (D1) is the length direction of the first pole group (110) and the second pole group (120), a first pole lug (111) extends from one end of the first pole group (110) toward the second pole group (120), and a second pole lug extends from one end of the second pole group (120) toward the first pole group (110), and the first pole lug (111) is electrically connected to the second pole lug; A support element, the support element comprising a spacer portion (210) and a support portion (220), the spacer portion (210) extending from the outer wall of the first pole group (110) to the outer wall of the second pole group (120) along the first direction (D1), the support portion (220) being connected to the spacer portion (210), the support portion (220) being sandwiched between the first pole group (110) and the second pole group (120), and the first pole lug (111) and the second pole lug being both located within the support portion (220).

2. The pole group assembly according to claim 1, characterized in that: A receiving groove (221) is provided on a side of the support portion (220) facing away from the barrier portion (210), and two opposite side walls of the receiving groove (221) are both provided with through holes (222), and the first pole tab (111) and the second pole tab are respectively passed through a corresponding one of the through holes (222) to the receiving groove (221), and the first pole tab (111) and the second pole tab are fixedly connected in the receiving groove (221).

3. The pole group assembly according to claim 2, characterized in that: The through holes (222) are provided on two opposite side walls of the accommodating groove (221) in the first direction (D1), and the first pole tab (111) and the second pole tab both extend along the first direction (D1).

4. The pole group assembly according to claim 3, characterized in that: There are two supporting elements, and the edge of the accommodating groove (221) of one of the two supporting elements fits with the edge of the accommodating groove (221) of the other, and the through hole (222) extends to the edge of the accommodating groove (221).

5. The pole group assembly according to any one of claims 2 to 4, characterized in that: An exhaust hole (223) is provided at the bottom of the accommodating groove (221), and the exhaust hole (223) extends to a side of the barrier portion (210) facing away from the supporting portion (220).

6. The pole group assembly according to any one of claims 1 to 4, characterized in that: An end surface of the first pole group (110) facing away from the second pole group (120) and / or an end surface of the second pole group (120) facing away from the first pole group (110) is a pushing surface, a pushing plate (300) is provided on the pushing surface, and an orthographic projection of the pushing plate (300) on the pushing surface is equal to a surface area of the pushing surface.

7. The pole group assembly according to claim 6, characterized in that: The barrier portion (210) is detachably connected to the push plate (300).

8. The pole group assembly according to claim 6, characterized in that: The supporting element further comprises a limiting portion (230), the limiting portion (230) being connected to one end of the barrier portion (210) facing the push plate (300), and the limiting portion (230) being in contact with a side of the push plate (300) facing away from the pushing surface.

9. The pole group assembly according to claim 8, characterized in that: A clamping groove (310) is provided on the side wall of the push plate (300), and the barrier portion (210) close to the limiting portion (230) is clamped in the clamping groove (310).

10. A battery cell, characterized in that It comprises a battery shell (10), a cover plate assembly and a pole group assembly according to any one of claims 1 to 9, wherein the pole group assembly is arranged in the battery shell (10), and the cover plate assembly is covered at the opening (11) of the battery shell (10).

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