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 includes a first pole group and a second pole group. The first pole group and the second pole group are arranged along a first direction, and the first direction is the length direction of the first pole group and the second pole group. The end, facing the second pole group, of the first pole group is provided with a first groove, the end, facing the first pole group, of the second pole group is provided with a second groove, and the first groove and the second groove are oppositely arranged and define a containing cavity. A first tab extends out of the first groove, a second tab extends out of the second groove, and the first tab and the second tab are conductively connected in the accommodating cavity. The pole group assembly is low in production difficulty and high in energy density; the probability that the first pole group and the second pole group are scratched is low, and the probability that the first pole group and the second pole group deform is also low. The battery monomer comprises a battery shell, a cover plate assembly and the pole group assembly, and has relatively high energy density, relatively low production difficulty and relatively high yield.

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] Lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. With the gradual increase in the energy density and safety requirements of power batteries, the use and development of longer power batteries are receiving more and more attention.

[0003] A power battery includes a battery case, a pole group, and a cover plate. The pole group is located inside the battery case, and the cover plate is sealed at the opening of the battery case. As the length of the power battery increases, the length of the battery case and the pole group will also increase. However, long pole groups are difficult to produce, and placing long pole groups in long battery cases can easily reduce the yield rate of the battery. Specifically, this is because most battery cases are made of metal, have thin walls, and sharp openings, while existing pole groups are heavy and soft in texture. When the pole group is pushed into the battery case along the length of the battery case, there is a risk of scratching the pole group. The longer the pole group, the higher the chance of the pole group being scratched. In addition, when pushing a longer pole group into the battery case, it is necessary to overcome the large friction between the battery case and the pole group, which can easily cause the middle area of the pole group to bend and deform, resulting in a reduction in the yield rate of the battery. Therefore, there is an urgent need to propose a pole group assembly and a battery cell. Utility Model Content

[0004] 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 the first pole group and the second pole group being scratched is low, and the probability of the first pole group, the second pole group, the first pole tab and the second pole tab being deformed is also low.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Electrode assembly, including:

[0007] 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 is the length direction of the first pole group and the second pole group, a first groove is provided at one end of the first pole group facing the second pole group, and a second groove is provided at one end of the second pole group facing the first pole group, the first groove and the second groove are arranged opposite to each other and are surrounded to form an accommodating cavity, a first pole ear extends from the first groove, a second pole ear extends from the second groove, and the first pole ear and the second pole ear are conductively connected in the accommodating cavity.

[0008] Optionally, the pole group assembly further includes a protective bracket, which includes a frame body and a supporting element, the frame body is arranged around the periphery of the first pole group and the second pole group, the supporting element connects two opposite sides of the frame body along the second direction, the supporting element is clamped between the first pole group and the second pole group, the first pole ear and the second pole ear are connected within the supporting element, and the second direction is the width direction of the first pole group and the second pole group.

[0009] Optionally, the supporting element includes a supporting portion and two first partition portions, the two first partition portions are respectively located at the two ends of the supporting portion along the second direction, the two first partition portions are respectively connected to the frame body, the supporting portion is located in the accommodating cavity, and the outer periphery of the supporting portion is arranged close to the inner wall of the accommodating cavity, and the first pole ear and the second pole ear are both arranged in the supporting portion.

[0010] Optionally, a receiving groove is provided in the support portion, the receiving groove passes through along the first direction, and the first electrode tab and the second electrode tab are both provided along the first direction and located in the receiving groove.

[0011] Optionally, the accommodating groove is opened on the surface of the supporting portion along a third direction, the third direction is the thickness direction of the first pole group and the second pole group, and the first pole tab and the second pole tab are stacked on the bottom of the accommodating groove.

[0012] Optionally, the pole group assembly further includes a pressing element, both ends of which are respectively connected to the frame body, the pressing element is clamped between the first pole group and the second pole group, and is buckled above the opening of the accommodating groove along the third direction.

[0013] Optionally, the pressing element includes a pressing portion and a second barrier portion, the second barrier portion is located at both ends of the pressing portion along the second direction, the two second barrier portions are respectively connected to the frame body, the pressing portion is located in the accommodating cavity, the pressing portion abuts against the opening edge of the accommodating groove of the support portion and is arranged close to the inner wall of the accommodating cavity.

[0014] Optionally, the frame body is formed by connecting side plates arranged opposite to each other along the second direction and push plates arranged opposite to each other along the first direction end to end, the inner walls of the side plates are provided with a limiting structure, and the second barrier portion is clamped to the limiting structure.

[0015] Optionally, both of the two limiting structures are provided with fixing grooves, and both of the second barrier portions are clamped in the corresponding fixing grooves.

[0016] A second object of the present invention is to provide a battery cell having higher energy density, lower production difficulty and higher yield.

[0017] To achieve this purpose, the present invention adopts the following technical solutions:

[0018] A battery cell comprises a battery shell, a cover plate assembly and the above-mentioned electrode group assembly, wherein the electrode group assembly is arranged in the battery shell, and the cover plate assembly is covered at the opening of the battery shell.

[0019] Beneficial effects of the utility model:

[0020] The pole group assembly provided by the utility model includes a first pole group and a second pole group. In actual production, the first pole group and the second pole group of relatively short length can be produced. The first pole group and the second pole group are arranged along their length direction and the first groove at the end of the first pole group and the second groove at the end of the second pole group are arranged opposite to each other and enclosed to form an accommodating cavity. Then, the first pole tab extending from the first groove and the second pole tab extending from the second groove are electrically connected in the accommodating cavity, thereby eliminating the need to produce pole groups of relatively long length, which is conducive to reducing production difficulty. Secondly, the pole group assembly formed by splicing the first pole group and the second pole group is relatively long, which has the effect of improving the energy density of the pole group assembly. Thirdly, the first pole tab and the second pole tab are connected in the accommodating cavity, which is conducive to providing protection for the first pole tab and the second pole tab, reducing the probability of the first pole group and the second pole group being scratched, and reducing the probability of deformation of the first pole group, the second pole group, the first pole tab and the second pole tab. In addition, the connection of the first pole tab and the second pole tab in the accommodating cavity can save the connection space of the first pole tab and the second pole tab, thereby saving the internal space of the pole group assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the electrode assembly provided by an embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of the first pole group of the pole group assembly provided by an embodiment of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of the second pole group of the pole group assembly provided by an embodiment of the present utility model;

[0024] Figure 4 This is a schematic structural diagram of the electrode assembly provided by an embodiment of the present invention without showing the pressing element;

[0025] Figure 5 This is a schematic structural diagram of a protective bracket for an electrode assembly provided by an embodiment of the present utility model;

[0026] Figure 6 yes Figure 5Enlarged view at point A;

[0027] Figure 7 This is a schematic diagram of the structure of the compression element of the pole group assembly provided by the embodiment of the utility model Figure 1 ;

[0028] Figure 8 This is a schematic diagram of the structure of the compression element of the pole group assembly provided by the embodiment of the utility model Figure 2 ;

[0029] Figure 9 This is an exploded view of a battery cell provided by an embodiment of the present utility model;

[0030] Figure 10 It is a structural schematic diagram of the cover assembly of the battery cell provided by an embodiment of the present utility model.

[0031] In the picture:

[0032] 100, first pole group; 110, first groove; 120, first pole tab; 200, second pole group; 210, second groove; 220, second pole tab; 300, protective bracket; 310, frame body; 311, side plate; 312, push plate; 313, limiting structure; 320, supporting element; 321, supporting portion; 322, first barrier portion; 323, accommodating groove; 400, pressing element; 410, pressing portion; 420, second barrier portion;

[0033] 10. Battery case; 11. First explosion-proof valve; 20. Cover plate assembly; 21. Cover body; 22. Boss; 23. Second explosion-proof valve; 30. Insulating film; 31. Slit. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The electrode group assembly provided in this embodiment has lower production difficulty and higher energy density; when the electrode group assembly is installed in the battery shell, the probability of the first electrode group and the second electrode group being scratched is lower, and the probability of the first electrode group, the second electrode group, the first electrode tab and the second electrode tab being deformed is also lower.

[0039] Specific as Figures 1 to 6As shown, the electrode assembly includes a first electrode group 100 and a second electrode group 200. The first electrode group 100 and the second electrode group 200 are arranged along a first direction, which is the length direction of the first electrode group 100 and the second electrode group 200. A first groove 110 is provided at one end of the first electrode group 100 facing the second electrode group 200, and a second groove 210 is provided at one end of the second electrode group 200 facing the first electrode group 100. The first groove 110 and the second groove 210 are arranged opposite each other and enclose a receiving cavity. A first electrode tab 120 extends from the first groove 110, and a second electrode tab 220 extends from the second groove 210. The first electrode tab 120 and the second electrode tab 220 are electrically connected within the receiving cavity. Based on the above design, in actual production, it is possible to produce a first pole group 100 and a second pole group 200 of shorter length, and then arrange them along their length direction and make the first groove 110 at the end of the first pole group 100 and the second groove 210 at the end of the second pole group 200 opposite to each other and surround them to form an accommodating cavity, and then the first pole ear 120 extending from the first groove 110 and the second pole ear 220 extending from the second groove 210 are conductively connected in the accommodating cavity, eliminating the need to produce pole groups with longer lengths, which is conducive to reducing production difficulty; secondly, the pole group assembly formed by splicing the first pole group 100 and the second pole group 200 The longer length has the effect of improving the energy density of the electrode assembly; secondly, the first electrode tab 120 and the second electrode tab 220 are connected in the accommodating cavity, which is beneficial to provide protection for the first electrode tab 120 and the second electrode tab 220, so that the probability of the first electrode group 100 and the second electrode group 200 being scratched is low, and the probability of the first electrode group 100, the second electrode group 200, the first electrode tab 120 and the second electrode tab 220 being deformed is also low; and the connection of the first electrode tab 120 and the second electrode tab 220 in the accommodating cavity can save the connection space of the first electrode tab 120 and the second electrode tab 220, thereby saving the internal space of the electrode assembly. It should be noted that, if Figure 2 、 Figure 3 and Figure 6 As shown, the width of the accommodating cavity along the first direction is H, and the depths of the first groove 110 and the second groove 210 along the first direction are W1 and W2 respectively, W1+W2<H, avoiding the first pole ear 120 from contacting the inner wall of the second groove 210 and the second pole ear 220 from contacting the inner wall of the first groove 110.

[0040] Furthermore, the pole group assembly also includes a protective bracket 300, which includes a frame body 310 and a support element 320. The frame body 310 is arranged around the periphery of the first pole group 100 and the second pole group 200, and the support element 320 connects the two opposite sides of the frame body 310 along the second direction. The support element 320 is clamped between the first pole group 100 and the second pole group 200, and the first pole ear 120 and the second pole ear 220 are connected inside the support element 320. The second direction (y direction in the figure) is the width direction of the first pole group 100 and the second pole group 200. Based on this design, the protective bracket 300 includes a frame body 310 and a support element 320. The frame body 310 is arranged around the periphery of the first pole group 100 and the second pole group 200, thereby protecting the first pole group 100 and the second pole group 200, reducing the probability of the first pole group 100 and the second pole group 200 being scratched by the battery shell 10 when the pole group assembly is installed in the battery shell 10, and having the effect of improving the yield rate of the battery cell; secondly, the support element 320 is sandwiched between the first pole group 100 and the second pole group 200, and the pole group assembly is installed in the battery shell 10 along the first direction. When the battery shell 10 is assembled, the supporting element 320 can support the first electrode group 100 and the second electrode group 200, thereby improving the structural strength of the electrode group assembly and reducing the probability of bending and deformation of the first electrode group 100 and the second electrode group 200; secondly, the first electrode tab 120 and the second electrode tab 220 are connected within the supporting element 320, which further protects the first electrode tab 120 and the second electrode tab 220. When the electrode group assembly is installed into the battery shell 10 along the first direction, deformation or breakage of the first electrode tab 120 and the second electrode tab 220 can be avoided.

[0041] In this embodiment, the protective bracket 300 is manufactured by an injection molding process, which is a common production process in the art and can also enable the protective bracket 300 to have better insulation properties.

[0042] Further, if Figure 4 、 Figure 5 and Figure 6As shown, the support element 320 includes a support portion 321 and two first barrier portions 322. The two first barrier portions 322 are located at opposite ends of the support portion 321 along the second direction and are respectively connected to the frame body 310. The support portion 321 is located in the accommodating cavity, and its periphery is disposed near the inner wall of the accommodating cavity. The first electrode tab 120 and the second electrode tab 220 are both disposed within the support portion 321. The first barrier portions 322 are connected to the frame body 310 and sandwiched between the first electrode group 100 and the second electrode group 200, thereby supporting and isolating the first electrode group 100 and the second electrode group 200. The periphery of the support portion 321 is located near the inner wall of the accommodating cavity, which not only isolates and supports the first electrode group 100 and the second electrode group 200, but also increases the contact area between the first electrode tab 120 and the second electrode tab 220 and the support portion 321, thereby further supporting and protecting the first electrode tab 120 and the second electrode tab 220.

[0043] In this embodiment, the first electrode tab 120 and the second electrode tab 220 are in direct contact and connection, eliminating the need for a conductive connector such as a copper busbar between the first electrode tab 120 and the second electrode tab 220. This not only reduces the weight of the electrode assembly, but also reduces the resistance between the first electrode group 100 and the second electrode group 200, thereby reducing the internal resistance of the electrode assembly.

[0044] Furthermore, a receiving slot 323 is defined within the support portion 321. The receiving slot 323 extends in a first direction, and the first electrode tab 120 and the second electrode tab 220 are both positioned in the receiving slot 323 along the first direction. Neither the first electrode tab 120 nor the second electrode tab 220 need to be bent; they are generally sheet-like structures, and they are in surface contact and fixedly connected, eliminating the need to bend the first electrode tab 120 and the second electrode tab 220. This also saves space occupied by the first electrode tab 120 and the second electrode tab 220, thereby reducing the volume of the electrode assembly. In this embodiment, the sheet-like first electrode tab 120 and the sheet-like second electrode tab 220 are fixedly connected using horizontal welding, further reducing the resistance between the first electrode assembly 100 and the second electrode assembly 200, thereby reducing the internal resistance of the electrode assembly.

[0045] Optionally, the receiving groove 323 is formed on the surface of the support portion 321 along the third direction, where the third direction (z direction in the figure) is the thickness direction of the first electrode group 100 and the second electrode group 200, and the first electrode tab 120 and the second electrode tab 220 are stacked at the bottom of the receiving groove 323. When the first electrode group 100 and the second electrode group 200 are installed in the frame body 310 of the protective bracket 300 along the third direction, the receiving groove 323 provides a clearance space for the first electrode tab 120 and the second electrode tab 220.

[0046] like Figure 7 、 Figure 8 and Figure 9As shown, to seal the avoidance space, the electrode assembly further includes a pressing element 400, the ends of which are connected to the frame body 310. The pressing element 400 is sandwiched between the first electrode group 100 and the second electrode group 200 and is buckled above the opening of the accommodating groove 323 along the third direction. The pressing element 400 and the supporting element 320 jointly isolate and support the first electrode group 100 and the second electrode group 200, and ensure that the thrust is balanced when the electrode assembly is installed into the battery case 10 along the first direction. The pressing element 400 and the supporting element 320 also jointly protect the first electrode tab 120 and the second electrode tab 220.

[0047] Furthermore, the pressing element 400 includes a pressing portion 410 and a second barrier portion 420. The second barrier portions 420 are located at both ends of the pressing portion 410 along the second direction. The two second barrier portions 420 are respectively connected to the frame body 310. The pressing portion 410 is located in the accommodating cavity. The pressing portion 410 abuts the opening edge of the accommodating groove 323 of the support portion 321 and is positioned close to the inner wall of the accommodating cavity. The second barrier portions 420 and the first barrier portion 322 jointly provide isolation and support for the first pole group 100 and the second pole group 200. The pressing portion 410 and the supporting portion 321 jointly protect the first pole tab 120 and the second pole tab 220; the pressing portion 410 is close to the inner wall of the accommodating cavity to increase the protection area of the first pole tab 120 and the second pole tab 220; the pressing portion 410 abuts against the opening edge of the accommodating groove 323, and the supporting portion 321 supports the pressing portion 410 to prevent the supporting portion 321 from crushing the first pole tab 120 and the second pole tab 220.

[0048] The width of the pressing portion 410 along the first direction is L, 0.5 mm < HL < 3 mm. For example, the value of HL can be 0.6 mm, 1.0 mm, 1.4 mm, 1.8 mm, 2.2 mm, 2.6 mm, or 2.9 mm.

[0049] In this embodiment, guide grooves and limiting grooves are provided on the support portion 321 to guide and limit the buckling installation of the pressing portion 410 , thereby facilitating the installation of the pressing element 400 and avoiding damage to the first tab 120 and the second tab 220 .

[0050] Furthermore, continue as Figure 5 and Figure 6 As shown, the frame body 310 is formed by connecting side plates 311 arranged opposite to each other along the second direction and push plates arranged opposite to each other along the first direction. A limiting structure 313 is provided on the inner wall of the side plate 311, and the second barrier portion 420 is clamped in the limiting structure 313 to limit the installation of the second barrier portion 420, further facilitating the installation and fixation of the clamping element 400.

[0051] Optionally, both limiting structures 313 are provided with fixing slots, and both second barrier portions 420 are secured to the corresponding fixing slots. In this embodiment, the fixing slots are through slots extending along the third direction, and the second barrier portions 420 are inserted into the fixing slots along the third direction. The fixing slots can both secure the second barrier portions 420 and guide the second barrier portions 420 for installation.

[0052] In this embodiment, the frame body 310 is integrally formed, and the overall design reduces the number of parts, simplifies the assembly process, and is easy to install; at the same time, it ensures that the electrode assembly can form an annular exhaust channel. In actual production, after the first electrode tab 120 and the second electrode tab 220 are welded, the first electrode group 100 and the second electrode group 200 are located on one side of the frame body 310, and the first electrode group 100 and the second electrode group 200 are placed into the frame body 310 along the third direction, so that the first electrode tab 120 and the second electrode tab 220 are located at the bottom of the receiving groove 323; then the second barrier portion 420 of the pressing element 400 is aligned with the fixing groove, and the pressing element 400 is installed along the third direction into the frame body 310 and abuts against the support element 320. When the pressing element 400 needs to be removed, it can be pulled out in the direction away from the support element 320. It can be seen that the electrode assembly provided by this embodiment has a simple structure and is easy to disassemble and assemble, which is conducive to improving production efficiency and reducing production difficulty.

[0053] Furthermore, the end surface of the first electrode assembly 100 facing away from the second electrode assembly 200 and the end surface of the second electrode assembly 200 facing away from the first electrode assembly 100 serve as the push surface, and the orthographic projection of the push plate on the push surface is equal to the surface area of the push surface. In actual production, the push plate of the frame body 310 is pushed in the first direction to push the electrode assembly into the battery case 10. The push plate and the push surface are in surface-to-surface contact, and the orthographic projection of the push plate on the push surface is equal to the surface area of the push surface. Therefore, when the push plate is pushed, the push plate can distribute the pushing force to the push surface, avoiding damage to the push surface due to excessive local pressure.

[0054] In this embodiment, the push plate and the first pole group 100 and the second pole group 200 can be fixed together by gluing, hot melting or the like.

[0055] This embodiment also provides a battery cell having high energy density, low production difficulty and high yield.

[0056] Specific as Figure 9As shown, the battery cell includes a battery case 10, a cover plate assembly 20, and the aforementioned electrode group assembly. The electrode group assembly is disposed within the battery case 10, and the cover plate assembly 20 covers the opening of the battery case 10. The battery cell employs the aforementioned electrode group assembly, which includes a first electrode group 100 and a second electrode group 200. Compared to batteries with a single electrode group in the prior art, the battery cell has a higher energy density. At the same time, the first electrode group 100 and the second electrode group 200 form a longer electrode group assembly. Compared to installing a longer electrode group into the battery case 10, installing the first electrode group 100 and the second electrode group 200 disposed within the protective bracket 300 into the battery case 10 reduces the probability of the first electrode group 100 and the second electrode group 200 being scratched by the battery case 10. The probability of the first electrode group 100 and the second electrode group 200 being bent and deformed, as well as the probability of the first electrode tab 120 and the second electrode tab 220 being deformed or broken, thereby improving the yield rate of the battery cell and reducing the difficulty of installing the electrode group assembly, thereby reducing the difficulty of producing the battery cell. In addition, the first electrode tab 120 and the second electrode tab 220 are connected in the accommodating cavity, which saves space within the electrode group assembly and the space occupied by the electrode group assembly within the battery case 10, thereby improving the energy density of the battery cell.

[0057] As shown in the figure, the battery case 10 is optionally provided with a first explosion-proof valve 11, and the first explosion-proof valve 11 is located adjacent to the first electrode group 100 and the second electrode group 200. The high pressure generated by the first electrode group 100 and the second electrode group 200 is discharged through the gap between the first electrode group 100 and the second electrode group 200 and the first explosion-proof valve 11, leaving the airway gap unobstructed, increasing exhaust efficiency, shortening the airway travel, and thereby improving the safety of the electrode group assembly.

[0058] Alternatively, as Figure 9 and Figure 10 As shown, the cover plate assembly 20 includes a cover body 21, which is made of a material with conductive properties such as a plain aluminum plate. The cover body 21 is arranged to cover the opening of the battery shell 10 along the first direction. The side of the cover body 21 facing the electrode group assembly is welded to the third pole ear (located on the side of the first electrode group 100 away from the first pole ear 120, not shown in the figure) or the fourth pole ear (located on the side of the second electrode group 200 away from the second pole ear 220, not shown in the figure) at the end of the electrode group assembly, so that the electrode group assembly is directly electrically connected to the cover body 21 through the third pole ear and the fourth pole ear, reducing the number of structures, reducing the internal resistance of the electrode group assembly, and saving costs.

[0059] It should be noted that the protection bracket 300 is an insulating member, and therefore the protection bracket 300 can prevent the cover body 21 and the pole group assembly from short-circuiting.

[0060] A boss 22 is provided on the side of the cover body 21 facing away from the electrode group assembly. The boss 22 is used to connect to other conductive elements outside the battery cell. This structural design can simplify the overall structure of the cover assembly 20, eliminating conventional cover parts such as poles, upper plastic and lower plastic, thereby improving space utilization and reducing production costs.

[0061] A second explosion-proof valve 23 is provided on the cover body 21, so that the high-pressure gas in the battery shell 10 can be discharged not only from the first explosion-proof valve 11, but also from the second explosion-proof valves 23 located at both ends of the battery shell 10 in the first direction, shortening the flow path of the high-pressure gas and increasing the exhaust volume, which has the effect of improving the exhaust efficiency, thereby improving the safety of the battery cell.

[0062] like Figure 9 As shown, optionally, the battery cell further includes an insulating film 30, which is wrapped around the outside of the electrode group assembly, namely the outside of the first electrode group 100 and the second electrode group 200 and the protective bracket 300, to improve the insulation protection capability of the electrode group assembly.

[0063] Furthermore, a slit 31 is provided on the insulating film 30 , and the slit 31 corresponds to the position of the first explosion-proof valve 11 , so that the high-pressure gas inside the electrode assembly can break through the slit 31 and quickly reach the first explosion-proof valve 11 .

[0064] 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 (100) and a second pole group (200), wherein the first pole group (100) and the second pole group (200) are arranged along a first direction, wherein the first direction is the length direction of the first pole group (100) and the second pole group (200), a first groove (110) is provided on one end of the first pole group (100) facing the second pole group (200), and a second groove (210) is provided on one end of the second pole group (200) facing the first pole group (100), wherein the first groove (110) and the second groove (210) are arranged opposite to each other and enclosed to form an accommodating cavity, wherein a first pole lug (120) extends from the first groove (110), and a second pole lug (220) extends from the second groove (210), and the first pole lug (120) and the second pole lug (220) are conductively connected in the accommodating cavity.

2. The pole group assembly according to claim 1, characterized in that: The pole group assembly further includes a protective bracket (300), the protective bracket (300) including a frame body (310) and a support element (320), the frame body (310) being arranged around the periphery of the first pole group (100) and the second pole group (200), the support element (320) connecting two opposite side edges of the frame body (310) along a second direction, the support element (320) being clamped between the first pole group (100) and the second pole group (200), the first pole ear (120) and the second pole ear (220) being connected within the support element (320), and the second direction being the width direction of the first pole group (100) and the second pole group (200).

3. The pole group assembly according to claim 2, characterized in that: The support element (320) comprises a support portion (321) and two first spacer portions (322), the two first spacer portions (322) being respectively located at the two ends of the support portion (321) along the second direction, the two first spacer portions (322) being respectively connected to the frame body (310), the support portion (321) being located in the accommodating cavity, and the periphery of the support portion (321) being arranged close to the inner wall of the accommodating cavity, and the first pole lug (120) and the second pole lug (220) being both arranged in the support portion (321).

4. The pole group assembly according to claim 3, characterized in that: An accommodating groove (323) is provided in the support portion (321), the accommodating groove (323) is passed through along the first direction, and the first pole tab (120) and the second pole tab (220) are both arranged along the first direction and located in the accommodating groove (323).

5. The pole group assembly according to claim 4, characterized in that: The accommodating groove (323) is opened on the surface of the supporting portion (321) along a third direction, the third direction being the thickness direction of the first pole group (100) and the second pole group (200), and the first pole tab (120) and the second pole tab (220) are stacked on the bottom of the accommodating groove (323).

6. The pole group assembly according to claim 5, characterized in that: The pole group assembly further comprises a pressing element (400), both ends of which are connected to the frame body (310), the pressing element (400) being sandwiched between the first pole group (100) and the second pole group (200), and being buckled above the opening of the accommodating groove (323) along the third direction.

7. The pole group assembly according to claim 6, characterized in that: The pressing element (400) comprises a pressing portion (410) and a second barrier portion (420), wherein the second barrier portions (420) are located at both ends of the pressing portion (410) along the second direction, and the two second barrier portions (420) are respectively connected to the frame body (310), and the pressing portion (410) is located in the accommodating cavity, and the pressing portion (410) abuts against the opening edge of the accommodating groove (323) of the supporting portion (321) and is arranged close to the inner wall of the accommodating cavity.

8. The pole group assembly according to claim 7, characterized in that: The frame body (310) is formed by connecting side plates (311) arranged opposite to each other along the second direction and push plates arranged opposite to each other along the first direction, the inner wall of the side plate (311) is provided with a limiting structure (313), and the second barrier portion (420) is clamped to the limiting structure (313).

9. The pole group assembly according to claim 8, characterized in that: The two limiting structures (313) are both provided with fixing grooves, and the two second barrier portions (420) are both clamped in the corresponding fixing grooves.

10. A battery cell, characterized in that It comprises a battery shell (10), a cover plate assembly (20) 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 (20) is covered at the opening of the battery shell (10).

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