Battery cell

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cell which comprises a battery shell, a pole group and a cover plate assembly, the battery shell is provided with a containing cavity and an opening which are distributed in the first direction and communicate with each other, the pole group comprises a pole group body and a protruding structure, and the pole group body is arranged in the containing cavity; the protruding structure comprises a first protruding part and two second protruding parts which are arranged on the side, facing the opening, of the pole group body in a protruding mode, the two second protruding parts are located on the two sides, in the second direction, of the pole group body respectively, and the first direction is perpendicular to the second direction; a first limiting groove and two second limiting grooves are formed in the side, facing the battery shell, of the cover plate, the first protruding parts are embedded in the first limiting groove in an insulating mode, each second protruding part is located in the corresponding second limiting groove, and the sides, deviating from each other, of the two second protruding parts abut against the inner walls of the corresponding second limiting grooves in an insulating mode respectively. The battery cell can play a role in limiting the pole group and can also improve the capacity of the pole group.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery cell. Background Technology

[0002] The battery cell includes an electrode assembly, a battery casing, and a cover assembly. The electrode assembly is located inside the battery casing, and the cover assembly seals the opening of the battery casing.

[0003] The electrode assembly lacks a limiting structure within the battery casing. When high-pressure gas enters the battery casing, the electrode assembly can easily move around within the casing along with the flow of high-pressure gas. When the internal pressure of the battery casing rises sharply, causing the explosion-proof valve on the battery casing to open, the high-pressure gas inside the battery casing flows towards the explosion-proof valve and is discharged from the battery casing through the valve. However, the moving electrode assembly can easily block the explosion-proof valve, preventing the high-pressure gas inside the battery casing from being discharged.

[0004] Therefore, there is an urgent need to develop a battery cell to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a battery cell that can limit the position of the electrode assembly and increase the capacity of the electrode assembly.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A battery cell, comprising:

[0008] The battery casing has a connected cavity and an opening, which are distributed along a first direction.

[0009] The pole assembly includes a pole assembly body and a protruding structure. The pole assembly body is disposed in a cavity. The protruding structure includes a first protrusion and two second protrusions. The first protrusion and the two second protrusions are both protruding on the side of the pole assembly body facing the opening. The two second protrusions are respectively located on both sides of the pole assembly body in a second direction. The first direction is perpendicular to the second direction.

[0010] The cover assembly includes a cover plate, which is disposed at the opening. The cover plate has a first limiting groove and two second limiting grooves on the side facing the battery casing. A first protrusion is insulatedly embedded in the first limiting groove. The two second protrusions correspond one-to-one with the two second limiting grooves. Each second protrusion is located in a corresponding second limiting groove. The opposite sides of the two second protrusions are insulatedly abutting against the inner wall of the corresponding second limiting groove.

[0011] Optionally, the first protrusion and the second protrusion are distributed along a third direction. The first protrusion extends from one side of the pole body to the other side along a second direction. Both second protrusions are connected to the first protrusion. Both the first direction and the second direction are perpendicular to the third direction.

[0012] Optionally, the two second protrusions are spaced apart along the second direction. The battery cell also includes a tab structure, which includes a first tab and two second tabs. The first tab is connected to the electrode assembly body and is located between the two second protrusions. The two second tabs correspond one-to-one with the two second protrusions. Each second tab is connected to the side of the corresponding second protrusion facing the other second protrusion. The two sides of the first tab in the second direction are respectively connected to the two second tabs.

[0013] Optionally, along the third direction, the distance between the opposite sides of the first protrusion and the second protrusion is W1, and the dimension of the first protrusion in the third direction is W2, 0.17≤W2 / W1≤0.54.

[0014] Optionally, along the second direction, the distance between the two second protrusions facing each other on one side is L, and the dimension of the pole group in the second direction is A, where 0.29≤L / A≤0.69.

[0015] Optionally, the battery casing includes a first sidewall and a second sidewall, the first sidewall and the second sidewall being disposed opposite each other along a third direction, and both the first direction and the second direction being perpendicular to the third direction;

[0016] The first sidewall is provided with a first protrusion, which protrudes in a direction away from the second sidewall and extends from one side of the first sidewall to the other side in a second direction. The second sidewall is provided with a second protrusion, which protrudes in a direction away from the first sidewall and extends from one side of the second sidewall to the other side in a second direction. The first protrusion and the second protrusion are staggered from each other in a first direction.

[0017] Optionally, the electrode assembly body includes a sub-electrode assembly, a first thickened portion, and a second thickened portion. The first thickened portion and the second thickened portion protrude from opposite sides of the sub-electrode assembly in a third direction. Both the first thickened portion and the second thickened portion extend from one side of the sub-electrode assembly to the other side along a second direction. The first thickened portion and the second thickened portion are staggered from each other in a first direction. The first thickened portion is directly opposite to the first protrusion in a third direction, and the second thickened portion is directly opposite to the second protrusion in a third direction.

[0018] Optionally, the sub-electrode assembly includes a first electrode assembly and a second electrode assembly, with a first thickened portion and a second thickened portion protruding from the first electrode assembly and the second electrode assembly, respectively. The first electrode assembly and the second electrode assembly are distributed along a first direction and are electrically connected.

[0019] Optionally, the first electrode assembly includes a first separator, a first positive electrode plate, and a first negative electrode plate. The first separator is sandwiched between the first positive electrode plate and the first negative electrode plate. The first electrode assembly has a first conductive layer and a second conductive layer on the side facing the second electrode assembly. The first conductive layer and the second conductive layer are spaced apart. The first conductive layer is electrically connected to the first positive electrode plate, and the second conductive layer is electrically connected to the first negative electrode plate.

[0020] The second electrode assembly includes a second diaphragm, a second positive electrode plate, and a second negative electrode plate. The second diaphragm is sandwiched between the second positive electrode plate and the second negative electrode plate. A third conductive layer and a fourth conductive layer are provided on the side of the second electrode assembly facing the first electrode assembly. The third conductive layer and the fourth conductive layer are spaced apart. The third conductive layer is electrically connected to the second positive electrode plate, and the fourth conductive layer is electrically connected to the second negative electrode plate.

[0021] The first conductive layer is bonded to the third conductive layer, and the second conductive layer is bonded to the fourth conductive layer.

[0022] Optionally, along the first direction, the distance between the first thickened portion and the second thickened portion facing each other on the same side is E1, where 5mm≤E1≤21mm.

[0023] The beneficial effects of this invention are:

[0024] First, the electrode assembly body has a first protrusion on the side facing the opening, and the cover plate has a first limiting groove on the side facing the battery case. The first protrusion is insulated and embedded in the first limiting groove. The inner wall of the first limiting groove can clamp the first protrusion, thereby limiting and supporting the electrode assembly and reducing the probability of the electrode assembly moving around in the cavity.

[0025] Secondly, the two second protrusions are located in the corresponding second limiting grooves, and the opposite sides of the two second protrusions are insulated against the inner wall of the corresponding second limiting groove. Thus, in the second direction, the opposite side walls of the two second limiting grooves can cooperate to provide limiting support for the electrode assembly, further reducing the probability of the electrode assembly moving along the second direction.

[0026] Furthermore, this structure provides a first protrusion and two second protrusions on the side of the electrode assembly facing the opening, which increases the volume of the electrode assembly and thus improves its capacity, which is beneficial for meeting the high-rate fast charging requirements of the battery cell. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the battery cell structure provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the first structure of the pole assembly provided by the present invention;

[0029] Figure 3This is a schematic diagram of the structure of the cover plate assembly provided by the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the cover plate provided by the present invention;

[0031] Figure 5 This is a schematic diagram of the first cross-sectional structure of the battery cell provided by the present invention;

[0032] Figure 6 This is a schematic diagram of the second cross-sectional structure of the battery cell provided by the present invention;

[0033] Figure 7 This is an exploded structural diagram of the cover plate assembly provided by the present invention;

[0034] Figure 8 This is a schematic diagram of the second structure of the pole group provided by the present invention;

[0035] Figure 9 This is a schematic diagram of the third structure of the pole assembly provided by the present invention;

[0036] Figure 10 This is a schematic diagram of the structure of multiple battery cells stacked sequentially according to the present invention;

[0037] Figure 11 This is a schematic diagram of the structure of the first pole assembly provided by the present invention;

[0038] Figure 12 yes Figure 9 Sectional view in the FF direction.

[0039] In the picture:

[0040] D1, First Direction; D2, Second Direction; D3, Third Direction;

[0041] 100. Battery casing; 110. First sidewall; 111. First protrusion; 120. Second sidewall; 121. Second protrusion; 210. Electrode assembly body; 211. Sub-electrode assembly body; 2111. First electrode assembly body; 2112. Second electrode assembly body; 2113. First conductive layer; 2114. Second conductive layer; 212. First thickened portion; 213. Second thickened portion; 220. Protruding structure; 221. First protrusion; 222. Second protrusion; 300. Cover assembly; 310. Cover; 311. First limiting groove; 312. Second limiting groove; 313. First plate; 314. Second plate; 3 15. Third plate; 316. Raised portion; 321. First conductive plate; 3211. First conductive part; 3212. Second conductive part; 3213. Third conductive part; 322. Pillar; 330. First plastic plate; 331. First insulating part; 332. Second insulating part; 333. Third insulating part; 340. Second conductive plate; 341. Fourth conductive part; 342. Fifth conductive part; 343. Sixth conductive part; 350. Second plastic plate; 351. Fourth insulating part; 352. Fifth insulating part; 353. Sixth insulating part; 400. Electrode structure; 410. First electrode; 420. Second electrode. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0046] This embodiment provides a battery cell that can limit the position of the electrode group and increase the capacity of the electrode group.

[0047] Specifically, such as Figures 1 to 6 As shown, the battery cell includes a battery casing 100, an electrode assembly, and a cover plate assembly 300. The battery casing 100 has a communicating cavity and an opening, which are distributed along a first direction D1. The electrode assembly includes an electrode assembly body 210 and a protruding structure 220. The electrode assembly body 210 is disposed within the cavity. The protruding structure 220 includes a first protrusion 221 and two second protrusions 222. The first protrusion 221 and the two second protrusions 222 both protrude from the side of the electrode assembly body 210 facing the opening. The two second protrusions 222 are respectively located on both sides of the electrode assembly body 210 in the second direction D2. The first direction D1 is perpendicular to the second direction D2. The cover plate assembly 300 includes a cover plate 310, which covers the opening. The cover plate 310 has a first limiting groove 311 and two second limiting grooves 312 on the side facing the battery case 100. A first protrusion 221 is insulatedly embedded in the first limiting groove 311. The two second protrusions 222 correspond one-to-one with the two second limiting grooves 312. Each second protrusion 222 is located in a corresponding second limiting groove 312. The two second protrusions 222 are insulatedly abutting against the inner wall of the corresponding second limiting groove 312 on the opposite sides.

[0048] First, the electrode assembly body 210 has a first protrusion 221 protruding on the side facing the opening, and the cover plate 310 has a first limiting groove 311 on the side facing the battery case 100. The first protrusion 221 is insulated and embedded in the first limiting groove 311. The inner wall of the first limiting groove 311 can clamp the first protrusion 221, thereby limiting and supporting the electrode assembly and reducing the probability of the electrode assembly moving within the cavity.

[0049] Secondly, the two second protrusions 222 are respectively located in a corresponding second limiting groove 312, and the opposite sides of the two second protrusions 222 are respectively insulated and abut against the inner wall of the corresponding second limiting groove 312. Thus, in the second direction D2, the opposite side walls of the two second limiting grooves 312 can cooperate to provide limiting support for the electrode group, further reducing the probability of the electrode group moving along the second direction D2.

[0050] Furthermore, this structure provides a first protrusion 221 and two second protrusions 222 on the side of the electrode assembly body 210 facing the opening, which increases the volume of the electrode assembly and thus improves the capacity of the electrode assembly, which is beneficial to meeting the high-rate fast charging requirements of the battery cell.

[0051] Furthermore, the first protrusion 221 and the second protrusion 222 are distributed along a third direction D3. The first protrusion 221 extends from one side of the pole group body 210 to the other side along a second direction D2. Both second protrusions 222 are connected to the first protrusion 221, and both second limiting grooves 312 are connected to the first limiting groove 311. The first direction D1 and the second direction D2 are both perpendicular to the third direction D3. On the one hand, this structure can increase the volume of the first protrusion 221, which can not only further increase the volume of the pole group to further improve the capacity of the pole group, but also improve the structural strength of the first protrusion 221, thereby improving the clamping effect of the first limiting groove 311 on the first protrusion 221, and thus improving the limiting and supporting effect on the pole group. On the other hand, both second protrusions 222 are connected to the first protrusion 221, so that the two second protrusions 222 and the first protrusion 221 form a mutual connection and support effect, which has the effect of improving the overall structural strength of the protrusion structure 220 and reducing the probability of deformation of the protrusion structure 220.

[0052] In this embodiment, the first direction D1 is the length direction of the battery cell, the second direction D2 is the width direction of the battery cell, and the third direction D3 is the thickness direction of the battery cell.

[0053] Optionally, the two second protrusions 222 are symmetrically arranged about the center of the pole body 210 in the second direction D2 to reduce manufacturing difficulty and improve production yield.

[0054] Optionally, the two second protrusions 222 are spaced apart along the second direction D2. The battery cell also includes a tab structure 400, which includes a first tab 410 and two second tabs 420. The first tab 410 is connected to the electrode assembly body 210 and is located between the two second protrusions 222. The two second tabs 420 correspond one-to-one with the two second protrusions 222. Each second tab 420 is connected to the side of a corresponding second protrusion 222 facing the other second protrusion 222. The two sides of the first tab 410 in the second direction D2 are connected to the two second tabs 420 respectively. This structure increases the distribution area of ​​the tab structure 400 on the electrode assembly, which is beneficial to improving the heat dissipation efficiency of the tab structure 400. Furthermore, this structure increases the area of ​​the tab structure 400, which improves the current carrying capacity of the tab structure 400, which is beneficial to meeting the high-rate fast charging requirements of the battery cell.

[0055] Optionally, such as Figure 7 As shown, the cover plate 310 includes a first plate 313, a raised portion 316, two second plates 314, and two third plates 315. The two second plates 314 are respectively connected to opposite sides of the first plate 313 in a second direction D2. The two third plates 315 are respectively connected to the sides of the two second plates 314 away from the first plate 313. Along the direction from the battery case 100 to the cover plate assembly 300, the two second plates 314 are inclined in mutually opposing directions. The raised portion 316 protrudes from the side of the first plate 313 away from the battery case 100, extends along the second direction D2, and is respectively connected to the two third plates 315. The raised portion 316 and the third plates 315 are distributed along a third direction D3. A first limiting groove 311 is located on the side of the raised portion 316 facing the battery case 100, and two second limiting grooves 312 are respectively located on the sides of the two third plates 315 facing the battery case 100.

[0056] Furthermore, the cover assembly 300 also includes a second conductive plate 340, which includes a fourth conductive portion 341, two fifth conductive portions 342, and two sixth conductive portions 343. The fourth conductive portion 341 is insulated from the side of the first plate 313 away from the battery case 100. The two fifth conductive portions 342 are respectively connected to both sides of the fourth conductive portion 341 in the second direction D2. The two sixth conductive portions 343 are respectively connected to the side of the two fifth conductive portions 342 away from the fourth conductive portion 341. In the second direction D2, the fifth conductive portion 342 located on the same side as the fourth conductive portion 341 is insulated from the side of the second plate 314 away from the battery case 100, and the sixth conductive portion 343 located on the same side as the fourth conductive portion 341 is insulated from the side of the third plate 315 away from the battery case 100. The fourth conductive part 341, the two fifth conductive parts 342 and the two sixth conductive parts 343 are all used for welding with the bar sheet (not shown in the figure). This structure increases the connection area between the cover plate assembly 300 and the bar sheet, thereby increasing the flow area between the cover plate assembly 300 and the bar sheet, which is beneficial to improving the flow rate between the cover plate assembly 300 and the bar sheet.

[0057] Furthermore, the cover plate assembly 300 also includes a second plastic plate 350, which includes a fourth insulating portion 351, two fifth insulating portions 352, and two sixth insulating portions 353. The fourth insulating portion 351 is sandwiched between the fourth conductive portion 341 and the first plate 313. The two fifth insulating portions 352 are respectively connected to both sides of the fourth insulating portion 351 in the second direction D2. The two sixth insulating portions 353 are respectively connected to the side of the two fifth insulating portions 352 away from the fourth insulating portion 351. In the second direction D2, the fifth insulating portion 352 located on the same side as the fourth insulating portion 351 is sandwiched between the fifth conductive portion 342 and the second plate 314, and the sixth insulating portion 353 located on the same side as the fourth insulating portion 351 is sandwiched between the sixth conductive portion 343 and the third plate 315, thereby achieving an insulating connection between the second conductive plate 340 and the cover plate 310.

[0058] Furthermore, such as Figure 3 As shown, along the direction from the battery casing 100 to the cover assembly 300, a raised portion 316 protrudes from the second conductive plate 340 and the second plastic plate 350, thereby protecting the second conductive plate 340 and the second plastic plate 350 and reducing the probability of the second conductive plate 340 and the second plastic plate 350 being bumped or knocked during the manufacturing process. Similarly, along the direction from the battery casing 100 to the cover assembly 300, the raised portion 316 protrudes from the battery cover, thereby protecting the battery cover and reducing the probability of the battery cover being bumped or knocked during the manufacturing process.

[0059] Optionally, such as Figure 3 and Figure 7As shown, the cover plate assembly 300 also includes an electrode structure, which includes a first conductive plate 321 and a post 322. The first conductive plate 321 includes a first conductive part 3211, two second conductive parts 3212, and two third conductive parts 3213. The first conductive part 3211 is insulated from the side of the first plate 313 facing the battery case 100. The two second conductive parts 3212 are respectively connected to both sides of the first conductive part 3211 in the second direction D2. The two third conductive parts 3213 are respectively connected to the side of the two second conductive parts 3212 away from the first conductive part 3211. In the second direction D2, the second conductive part 3212 located on the same side as the first conductive part 3211 is insulated from the side of the second plate 314 facing the battery case 100, and the third conductive part 3213 located on the same side as the first conductive part 3211 is insulated from the side of the third plate 315 facing the battery case 100. The first tab 410 is welded to the first conductive part 3211, and the two second tabs 420 are respectively welded to the two second conductive parts 3212. In the prior art, the electrode post structure includes an integral electrode post body and a base plate, and the area where it is conductively connected to the tab structure 400 is only the base plate. In this embodiment, the first tab 410 is welded to the first conductive part 3211, and the two second tabs 420 are respectively welded to the two second conductive parts 3212, which expands the connection area between the electrode post structure and the tab structure 400, that is, expands the current-carrying area between the electrode post structure and the tab structure 400, thereby improving the current-carrying capacity between the cover plate assembly 300 and the electrode group, which is beneficial to meeting the high-rate charging requirements of the battery cell.

[0060] Furthermore, one end of the column 322 is welded to the first conductive part 3211, and the other end passes through the first plate 313, the second plastic plate 350 and the fourth conductive part 341, and is riveted and welded to the fourth conductive part 341 for fixation, thereby making the first conductive plate 321 and the second conductive plate 340 electrically connected through the column 322. Compared to the existing electrode structure which includes an integral electrode body and base plate, the electrode structure provided in this embodiment connects the column 322 to the first conductive part 3211, reducing the manufacturing difficulty of the electrode structure. In actual production, the column 322 and the first conductive plate 321 can be produced separately, and then the column 322 can be connected to the first conductive part 3211 of the first conductive plate 321 by welding or other common processes in the art. Not only can the column 322 and the first conductive plate 321 in the electrode structure be produced separately, but the connection process between the column 322 and the first conductive plate 321 is also simple. It can be seen that this structure is conducive to improving production efficiency and reducing production difficulty, thereby achieving the effect of reducing production costs and improving production yield.

[0061] Furthermore, the cover plate assembly 300 also includes a first plastic plate 330, which includes a first insulating part 331, two second insulating parts 332, and two third insulating parts 333. The first insulating part 331 is sandwiched between the first conductive part 3211 and the first plate body 313. The two second insulating parts 332 are respectively connected to both sides of the first insulating part 331 in the second direction D2. The two third insulating parts 333 are respectively connected to the side of the two second insulating parts 332 away from the first insulating part 331. In the second direction D2, the second insulating part 332 located on the same side as the first insulating part 331 is sandwiched between the second plate body 314 and the second conductive part 3212. The third insulating part 333 located on the same side as the first insulating part 331 is sandwiched between the third plate body 315 and the third conductive part 3213, thereby achieving an insulating connection between the first conductive plate 321 and the cover plate 310.

[0062] Optionally, such as Figure 8 As shown, along the third direction D3, the distance between the opposite sides of the first protrusion 221 and the second protrusion 222 is W1, and the dimension of the first protrusion 221 in the third direction D3 is W2, where 0.17≤W2 / W1≤0.54. For example, W2 / W1 can be 0.17, 0.2, 0.33, 0.45, 0.5, or 0.54, etc., with 0.2≤W2 / W1≤0.5 being preferred. If W2 / W1<0.17, the dimension of the first protrusion 221 in the third direction D3 is too small, which will reduce the increase in the volume of the electrode assembly and the increase in the capacity of the electrode assembly. In addition, it will reduce the structural strength of the first protrusion 221, which not only increases the probability of bending deformation of the first protrusion 221, but also reduces the clamping effect of the inner wall of the first limiting groove 311 on the first protrusion 221, thereby reducing the limiting support effect on the electrode assembly. If W2 / W1 > 0.54, then with W1 remaining constant, W2 is too large. This will make the size of the second protrusion 222 in the third direction D3 too small, thereby reducing the structural strength of the second protrusion 222, reducing the increase in the volume of the electrode assembly, and reducing the increase in the capacity of the electrode assembly. In addition, an excessively large W2 will also make the size of the electrode assembly body 210 in the third direction D3 too small, thereby reducing the size of the first plate 313 in the third direction D3, increasing the probability of deformation of the first plate 313, reducing the connection area and flow area between the column 322 and the first plate 313, and also reducing the welding strength at the opening between the cover plate 310 and the battery case 100.

[0063] Optionally, such as Figure 9As shown, along the second direction D2, the distance between the two second protrusions 222 facing each other on one side is L, and the size of the electrode assembly in the second direction D2 is A, where 0.29 ≤ L / A ≤ 0.69. For example, L / A can be 0.29, 0.33, 0.4, 0.55, 0.66, or 0.69, with 0.33 ≤ L / A ≤ 0.66 being preferred. If L / A < 0.29, the size of the first plate 313 in the second direction D2 is insufficient, which reduces the connection area and current flow area between the column 322 and the first plate 313, failing to meet the high-rate fast charging requirements of the battery cell. If L / A > 0.69, the size of the second protrusion 222 in the second direction D2 is too small, which reduces the structural strength of the second protrusion 222, decreases the increase in electrode assembly capacity, and reduces the limiting and supporting effect of the two opposing sidewalls of the second limiting grooves 312 on the electrode assembly.

[0064] Optionally, such as Figure 1 and Figure 2 As shown, in this embodiment, there are two protruding structures 220, two cover plate assemblies 300, and two openings, which correspond one-to-one. The two protruding structures 220 are located on both sides of the electrode body 210 in the first direction D1. Each first protrusion 221 is insulated and abuts against the bottom of a corresponding first limiting groove 311, and each second protrusion 222 is insulated and abuts against the bottom of a corresponding second limiting groove 312, so that the two cover plates 310 can cooperate with each other to further limit the electrode group in the first direction D1.

[0065] Optionally, such as Figure 1 As shown, the battery casing 100 includes a first sidewall 110 and a second sidewall 120, which are disposed opposite to each other along a third direction D3. The first sidewall 110 has a first protrusion 111, which protrudes in a direction away from the second sidewall 120 and extends from one side of the first sidewall 110 to the other side along a second direction D2. The second sidewall 120 has a second protrusion 121, which protrudes in a direction away from the first sidewall 110 and extends from one side of the second sidewall 120 to the other side along a second direction D2. The first protrusion 111 and the second protrusion 121 are staggered in the first direction D1. Figure 10 As shown, when multiple battery cells are stacked sequentially along the third direction D3, in two adjacent battery cases 100, the first sidewall 110 of one is set towards the second sidewall 120 of the other. Therefore, in two adjacent battery cases 100, the first protrusion 111 of one and the second protrusion 121 of the other are positioned and limited to each other in the first direction D1, thereby achieving the effect of quick positioning and mutual limitation between two adjacent battery cells.

[0066] Furthermore, such as Figure 2 and Figure 5 As shown, the electrode assembly body 210 includes a sub-electrode assembly 211, a first thickened portion 212, and a second thickened portion 213. The first thickened portion 212 and the second thickened portion 213 are respectively protruding from opposite sides of the sub-electrode assembly 211 in a third direction D3. Both the first thickened portion 212 and the second thickened portion 213 extend from one side of the sub-electrode assembly 211 to the other side along a second direction D2. The first thickened portion 212 and the second thickened portion 213 are staggered from each other in a first direction D1. The first thickened portion 212 is directly opposite to the first protrusion 111 in the third direction D3, and the second thickened portion 213 is directly opposite to the second protrusion 121 in the third direction D3. On the one hand, the arrangement of the first thickened portion 212 and the second thickened portion 213 increases the volume of the electrode assembly, thereby increasing the electrode assembly capacity, which is beneficial to meeting the high-rate fast charging requirements of the battery cell. On the other hand, the provision of the first thickened portion 212 and the second thickened portion 213 improves the structural strength of the sub-electrode assembly 211, thereby reducing the probability of deformation of the sub-electrode assembly 211. Furthermore, the first thickened portion 212 is positioned directly opposite the first protrusion 111 on the third direction D3, and the second thickened portion 213 is positioned directly opposite the second protrusion 121 on the third direction D3. This fully utilizes the space of the cavity corresponding to the first protrusion 111 and the second protrusion 121, thereby improving the space utilization rate of the battery casing 100 and contributing to increasing the energy density of the battery cell.

[0067] Furthermore, the sub-electrode assembly 211 includes a first electrode assembly 2111 and a second electrode assembly 2112. A first thickened portion 212 and a second thickened portion 213 protrude from the first electrode assembly 2111 and the second electrode assembly 2112, respectively. The first electrode assembly 2111 and the second electrode assembly 2112 are distributed along the first direction D1 and are electrically connected. Therefore, when the electrode assembly is inserted into the battery case 100, the first electrode assembly 2111 and the second electrode assembly 2112 can be inserted from the two openings of the battery case 100, respectively. This structure simplifies the operation of inserting the electrode assembly into the battery case 100 and improves assembly efficiency.

[0068] Furthermore, such as Figure 11As shown, the first electrode assembly 2111 includes a first separator, a first positive electrode plate, and a first negative electrode plate (the first separator, the first positive electrode plate, and the first negative electrode plate are not shown in the figure). The first positive electrode plate, the first separator, and the first negative electrode plate are stacked sequentially along the third direction D3. The first separator is sandwiched between the first positive electrode plate and the first negative electrode plate. The first electrode assembly 2111 has a first conductive layer 2113 and a second conductive layer 2114 on the side facing the second electrode assembly 2112. The first conductive layer 2113 and the second conductive layer 2114 are spaced apart. The first conductive layer 2113 is electrically connected to the first positive electrode plate, and the second conductive layer 2114 is electrically connected to the first negative electrode plate. The second electrode assembly 2112 includes a second separator, a second positive electrode plate, and a second negative electrode plate (the second separator, second positive electrode plate, and second negative electrode plate are not shown in the figure). The second positive electrode plate, the second separator, and the second negative electrode plate are stacked sequentially along a third direction D3. The second separator is sandwiched between the second positive electrode plate and the second negative electrode plate. A third conductive layer and a fourth conductive layer are provided on the side of the second electrode assembly 2112 facing the first electrode assembly 2111. The third conductive layer and the fourth conductive layer are spaced apart. The third conductive layer is electrically connected to the second positive electrode plate, and the fourth conductive layer is electrically connected to the second negative electrode plate. The first conductive layer 2113 is bonded to the third conductive layer, and the second conductive layer 2114 is bonded to the fourth conductive layer. This structure achieves conductive connection between the first electrode assembly 2111 and the second electrode assembly 2112 by bonding the first conductive layer 2113 to the third conductive layer and the second conductive layer 2114 to the fourth conductive layer. This eliminates the need to set conductive sheets or other conductive elements on the first electrode assembly 2111 and the second electrode assembly 2112, thus reducing the size of the electrode assembly and also reducing production costs.

[0069] Furthermore, both the first electrode assembly 2111 and the second electrode assembly 2112 are manufactured using a lamination process. In the first electrode assembly 2111, on one side of the second direction D2, the first positive electrode sheet protrudes from the first negative electrode sheet along the direction from the first electrode assembly 2111 to the second electrode assembly 2112, thereby allowing the first conductive layer 2113 to cover the end face of the first positive electrode sheet pointing towards the second electrode assembly 2112, achieving a conductive connection between the first conductive layer 2113 and the first positive electrode sheet. On the other side of the first electrode assembly 2111, in the second direction D2, the first negative electrode sheet protrudes from the first positive electrode sheet along the direction from the first electrode assembly 2111 to the second electrode assembly 2112, thereby allowing the second conductive layer 2114 to cover the end face of the first negative electrode sheet pointing towards the second electrode assembly 2112, achieving a conductive connection between the second conductive layer 2114 and the first negative electrode sheet. Furthermore, the first conductive layer 2113 and the second conductive layer 2114 are spaced apart along the second direction D2.

[0070] In the second electrode assembly 2112, on one side of the second electrode assembly 2112 in the second direction D2, the second positive electrode sheet protrudes from the second negative electrode sheet along the direction from the second electrode assembly 2112 to the first electrode assembly 2111. This allows the third conductive layer to cover the end face of the second positive electrode sheet pointing towards the first electrode assembly 2111, achieving a conductive connection between the third conductive layer and the second positive electrode sheet. On the other side of the second electrode assembly 2112 in the second direction D2, the second negative electrode sheet protrudes from the second positive electrode sheet along the direction from the second electrode assembly 2112 to the first electrode assembly 2111. This allows the fourth conductive layer to cover the end face of the second negative electrode sheet pointing towards the first electrode assembly 2111, achieving a conductive connection between the fourth conductive layer and the second negative electrode sheet. Furthermore, the third and fourth conductive layers are spaced apart along the second direction D2.

[0071] Optionally, the first conductive layer 2113, the second conductive layer 2114, the third conductive layer and the fourth conductive layer can be coatings with conductive properties, such as graphite layers or tin oxide layers.

[0072] Optionally, such as Figure 8 As shown, along the first direction D1, the distance between the two sides of the first thickened portion 212 and the second thickened portion 213 facing each other is E1, where 5mm ≤ E1 ≤ 21mm. For example, E1 can be 5mm, 6mm, 10mm, 20mm, or 21mm, with 6mm ≤ E1 ≤ 20mm being preferred. If E1 < 5mm, the distance between the first protrusion 111 and the second protrusion 121 in the first direction D1 is too small. When the first electrode assembly 2111 and the second electrode assembly 2112 are respectively installed into the battery case 100, higher positioning and dimensional accuracy are required, increasing assembly difficulty, reducing production efficiency, and increasing the assembly defect rate. Furthermore, the excessively small distance between the first protrusion 111 and the second protrusion 121 in the first direction D1 increases the manufacturing difficulty of the battery case 100, thereby reducing the production yield of the battery case 100. If E1 > 21mm, while keeping the size of the electrode assembly unchanged along the first direction D1, the size of the first thickened portion 212 and the second thickened portion 213 along the first direction D1 will be reduced, thereby reducing the increase in the volume of the electrode assembly and the increase in the capacity of the electrode assembly. In addition, the structural strength of the first electrode assembly body 2111 facing the second electrode assembly body 2112 will be reduced, and the structural strength of the second electrode assembly body 2112 facing the first electrode assembly body 2111 will be reduced.

[0073] Optionally, along the third direction D3, the distance between the opposite sides of the first protrusion 221 and the second protrusion 222 is W1, the sum of the dimensions of the first electrode assembly 2111 and the first thickened portion 212 in the third direction D3 is W1, the sum of the dimensions of the second electrode assembly 2112 and the second thickened portion 213 in the third direction D3 is W1, and the dimensions of the first thickened portion 212 and the second thickened portion 213 in the third direction D3 are both E2, 18mm≤W1-E2≤80mm. For example, W1-E2 can be 18mm, 55mm, or 80mm, etc. If W1-E2<18mm, the dimensions of the first electrode assembly 2111 and the second electrode assembly 2112 in the third direction D3 are too small, which will reduce the structural strength of the first electrode assembly 2111 towards the second electrode assembly 2112 and reduce the structural strength of the second electrode assembly 2112 towards the first electrode assembly 2111. If W1-E2 > 80mm, the dimensions of the first thickened portion 212 and the second thickened portion 213 in the third direction D3 will be too small, which will reduce the increase in the volume of the electrode assembly and reduce the increase in the capacity of the electrode assembly.

[0074] Optionally, in this embodiment, there are two protruding structures 220, which are respectively protruding on both sides of the pole group body 210 in the first direction D1, such as... Figure 8 As shown, the first electrode assembly 2111 has a second protrusion 222 protruding from the side opposite to the second electrode assembly 2112, and the first thickened portion 212 has a first protrusion 221 protruding from the side opposite to the second electrode assembly 2112; the second electrode assembly 2112 has another second protrusion 222 protruding from the side opposite to the first electrode assembly 2111, and the second thickened portion 213 has another first protrusion 221 protruding from the side opposite to the first electrode assembly 2111. In the first direction D1, the distance between the side of the first electrode assembly 2111 facing the second electrode assembly 2112 and the side of the first protrusion 221 on the first thickened portion 212 away from the electrode assembly body 210 is B. The distance between the side of the second electrode assembly 2112 facing the first electrode assembly 2111 and the side of the first protrusion 221 on the second thickened portion 213 away from the electrode assembly body 210 is also B. 200mm≤B≤600mm. For example, B can be 200mm, 500mm or 600mm, etc.

[0075] Optionally, such as Figure 9As shown, in the first direction D1, the distance between the side of the first protrusion 221 facing away from the electrode assembly body 210 and the side of the second protrusion 222 facing away from the electrode assembly body 210 is H1, and the dimension of the first protrusion 221 protruding from the electrode assembly body 210 is H2, 15mm≤H2-H1≤35mm. For example, H2-H1 can be 15mm, 25mm, or 35mm, etc. With H1 unchanged, if H2-H1 < 15mm, then... If H2 is too small, it will reduce the size of the first protrusion 221 protruding from the electrode assembly body 210, thus reducing the increase in electrode assembly volume and capacity. Furthermore, a small H2 will also reduce the size of the raised portion 316 protruding from the first plate 313, thereby reducing the protective effect of the raised portion 316 on the second plastic plate 350, the second conductive plate 340, and the electrode pad, increasing the likelihood of these components being bumped or knocked. If H2-H1 > 35mm, then H2 is too large, causing the first protrusion 221 to protrude excessively from the electrode assembly body 210, reducing its structural strength. This not only increases the likelihood of bending deformation of the first protrusion 221 but also reduces the clamping effect of the inner wall of the first limiting groove 311 on the first protrusion 221, thus reducing the limiting and supporting effect on the electrode assembly.

[0076] Furthermore, 25mm≤H2≤45mm, where H2 can be 25mm, 30mm, or 45mm, for example.

[0077] Optionally, along the direction in which the first protrusion 221 protrudes from the electrode assembly body 210, the two second protrusions 222 are inclined in opposite directions on the sides facing each other, and the included angle between the two sides facing each other is N1, 12°≤N1≤30°. For example, N1 can be 12°, 25°, or 30°, etc. If N1 is too small, it will increase the manufacturing difficulty of the two second protrusions 222, thereby reducing the production yield. If N1 is too large, it will reduce the spacing between the two second protrusions 222 in the second direction D2, thereby reducing the size of the first plate 313 in the second direction D2. This will reduce the connection area and flow area between the column 322 and the first plate 313.

[0078] Optionally, such as Figure 12As shown, the angle between the side of the first thickened portion 212 facing the second electrode assembly 2112 and the side of the second electrode assembly 2112 away from the second thickened portion 213 is N2, and the angle between the side of the second thickened portion 213 facing the first electrode assembly 2111 and the side of the first electrode assembly 2111 away from the first thickened portion 212 is also N2, 90°≤N2≤110°. For example, N2 can be 90°, 100° or 110°, so that the battery case 100 also has an angle of N2 at the corresponding positions (i.e., the position where the first protrusion 111 protrudes and the position where the second protrusion 121 protrudes), thereby reducing the production difficulty of the battery case 100 and improving the production yield.

[0079] In this embodiment, the electrode assembly is manufactured using a lamination process and a die-cutting process. The electrode post is connected to the first conductive part 3211, the electrode post is connected to the fourth conductive part 341, and the electrode tab structure 400 is connected to the first conductive plate 321 by an ultrasonic welding process. The lamination process, die-cutting process, and ultrasonic welding process are all common production processes in the field, which are conducive to achieving mass automated production.

[0080] Table 1 below provides six sets of examples and six sets of comparative examples. In the six sets of experimental examples and six sets of comparative examples, the battery casing 100 is made of 0.35mm thick aluminum material, the insulating film wrapped around the outer surface of the electrode group is polypropylene (PP) film, the second plastic plate 350 is made of polyphenylene sulfide (PPS) material, and the first plastic plate 330 is made of PP material.

[0081]

[0082] In Example 1, W2 / W1 is 0.2, W1-E2 is 18mm, E1 is 6mm, H2 is 25mm, H2-H1 is 15mm, L / A is 0.33, N1 is 12°, N2 is 90°, B is 200mm, and the cell yield is >98%. No problems such as low electrode strength or abnormal contact assembly were found. The electrode assembly and tabs showed no damage or deformation. The tab structure's 400° overcurrent capacity and electrode assembly capacity meet the high-rate charging requirements of the cell. The tab structure's 400° temperature meets the cell's requirements.

[0083] In Example 2, W2 / W1 is 0.3, W1-E2 is 25mm, E1 is 8mm, H2 is 28mm, H2-H1 is 18mm, L / A is 0.38, N1 is 15°, N2 is 95°, B is 250mm, and the cell yield is >98%. No problems such as low electrode strength or abnormal contact assembly were found. The electrode assembly and tabs showed no damage or deformation. The tab structure's 400° current carrying capacity and electrode assembly capacity meet the high-rate charging requirements of the cell. The tab structure's 400° temperature meets the cell's requirements.

[0084] In Example 3, W2 / W1 is 0.36, W1-E2 is 38mm, E1 is 12mm, H2 is 33mm, H2-H1 is 22mm, L / A is 0.45, N1 is 18°, N2 is 100°, B is 320mm, and the cell yield is >98%. No problems such as low electrode strength or abnormal contact assembly were found. The electrode assembly and tabs showed no damage or deformation. The tab structure's 400° current carrying capacity and electrode assembly capacity meet the high-rate charging requirements of the cell. The tab structure's 400° temperature meets the cell's requirements.

[0085] In Example 4, W2 / W1 is 0.41, W1-E2 is 54mm, E1 is 14mm, H2 is 38mm, H2-H1 is 26mm, L / A is 0.54, N1 is 22°, N2 is 104°, B is 430mm, and the cell yield is >98%. No problems such as low electrode strength or abnormal contact assembly were found. The electrode assembly and tabs showed no damage or deformation. The tab structure's 400° current carrying capacity and electrode assembly capacity meet the high-rate charging requirements of the cell. The tab structure's 400° temperature meets the cell's requirements.

[0086] In Example 5, W2 / W1 is 0.45, W1-E2 is 72mm, E1 is 16mm, H2 is 40mm, H2-H1 is 30mm, L / A is 0.6, N1 is 26°, N2 is 107°, B is 540mm, and the cell yield is >98%. No problems such as low electrode strength or abnormal contact assembly were found. The electrode assembly and tabs showed no damage or deformation. The tab structure's 400° overcurrent capacity and electrode assembly capacity meet the high-rate charging requirements of the cell. The tab structure's 400° temperature meets the cell's requirements.

[0087] In Example 6, W2 / W1 is 0.5, W1-E2 is 80mm, E1 is 20mm, H2 is 45mm, H2-H1 is 35mm, L / A is 0.66, N1 is 30°, N2 is 110°, B is 600mm, and the cell yield is >98%. No problems such as low electrode strength or abnormal contact assembly were found. The electrode assembly and tabs showed no damage or deformation. The tab structure's 400° overcurrent capacity and electrode assembly capacity meet the high-rate charging requirements of the cell. The tab structure's 400° temperature meets the cell's requirements.

[0088] In Comparative Example 1, W2 / W1 is 0.16, W1-E2 is 38mm, E1 is 12mm, H2 is 33mm, H2-H1 is 22mm, L / A is 0.45, N1 is 18°, N2 is 100°, B is 320mm, and the cell yield is <98%. The capacity increase of the electrode assembly is small and cannot meet the high-rate fast charging requirements of the cell. The first protrusion 221 has low structural strength, and the inner wall of the first limiting groove 311 has a poor clamping effect on the first protrusion 221, resulting in poor limiting support for the electrode assembly.

[0089] In Comparative Example 2, W2 / W1 is 0.55, W1-E2 is 38mm, E1 is 12mm, H2 is 33mm, H2-H1 is 22mm, L / A is 0.45, N1 is 18°, N2 is 100°, B is 320mm, and the cell yield is <98%. The second protrusion 222 has low structural strength, resulting in a small increase in electrode capacity and failing to meet the high-rate fast charging requirements of the cell. The first plate 313 has a small dimension in the third direction D3, and the current-passing area between the pillar 322 and the first plate 313 is small.

[0090] In Comparative Example 3, W2 / W1 is 0.36, W1-E2 is 38mm, E1 is 4mm, H2 is 33mm, H2-H1 is 22mm, L / A is 0.45, N1 is 18°, N2 is 100°, B is 320mm, and the cell yield is <98%. This indicates high assembly difficulty and a high failure rate in assembling the electrode assembly and battery casing 100. The production of battery casing 100 is also difficult, resulting in a low production yield.

[0091] In Comparative Example 4, W2 / W1 is 0.36, W1-E2 is 38mm, E1 is 22mm, H2 is 33mm, H2-H1 is 22mm, L / A is 0.45, N1 is 18°, N2 is 100°, B is 320mm, and the cell yield is <98%. The increase in electrode assembly volume and capacity is small. The structural strength of the first electrode assembly 2111 facing the second electrode assembly 2112 is low, and the structural strength of the second electrode assembly 2112 facing the first electrode assembly 2111 is also low.

[0092] In Comparative Example 5, W2 / W1 is 0.36, W1-E2 is 38mm, E1 is 12mm, H2 is 33mm, H2-H1 is 22mm, L / A is 0.28, N1 is 18°, N2 is 100°, B is 320mm, and the cell yield is <98% because the connection area between the column 322 and the first plate 313 is small and the current-carrying area is small, which cannot meet the high-rate fast charging requirements of the cell.

[0093] In Comparative Example 6, W2 / W1 is 0.36, W1-E2 is 38mm, E1 is 12mm, H2 is 33mm, H2-H1 is 22mm, L / A is 0.7, N1 is 18°, N2 is 100°, B is 320mm, and the cell yield is <98%. The second protrusion 222 has low structural strength, resulting in a small increase in electrode capacity and failing to meet the high-rate fast charging requirements of the cell. The two second limiting grooves 312, with their opposite sidewalls, provide poor limiting support for the electrode assembly.

[0094] In summary, when the above parameters satisfy 0.17≤W2 / W1≤0.54, 18mm≤W1-E2≤80mm, 5mm≤E1≤21mm, 15mm≤H2-H1≤35mm, 0.29≤L / A≤0.69, 25mm≤H2≤45mm, 12°≤N1≤30°, 90°≤N2≤110°, and 200mm≤B≤600mm, a good supporting and limiting effect on the electrode group can be achieved. Furthermore, the electrode group volume can be increased, the electrode group capacity improved, and the 300Ω overcurrent capability of the cover plate assembly enhanced to meet the high-rate fast charging requirements of the battery cells.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An electric cell, characterized by, The battery shell (100) is provided with a communicating cavity and an opening, and the cavity and the opening are distributed along a first direction (D1); The pole group includes a pole group body (210) and a protruding structure (220), the pole group body (210) is arranged in the cavity, the protruding structure (220) includes a first protruding part (221) and two second protruding parts (222), the first protruding part (221) and the two second protruding parts (222) are arranged on the side of the pole group body (210) facing the opening, and the two second protruding parts (222) are respectively located on the two sides of the pole group body (210) in a second direction (D2), and the first direction (D1) is perpendicular to the second direction (D2); The cover plate assembly (300) includes a cover plate (310), the cover plate (310) is arranged on the opening, and the side of the cover plate (310) facing the battery shell (100) is provided with a first limiting groove (311) and two second limiting grooves (312), the first protruding part (221) is insulatively arranged in the first limiting groove (311), and the two second protruding parts (222) correspond to the two second limiting grooves (312) one by one, each second protruding part (222) is located in a corresponding second limiting groove (312), and the side of the two second protruding parts (222) away from each other is respectively insulatively abutted against the inner wall of the corresponding second limiting groove (312). The first protruding part (221) and the second protruding part (222) are distributed along a third direction (D3), the first protruding part (221) extends from one side of the pole group body (210) to the other side along the second direction (D2), the two second protruding parts (222) are connected with the first protruding part (221), and the first direction (D1) and the second direction (D2) are perpendicular to the third direction (D3).

2. The electric cell of claim 1, wherein, The two second protruding parts (222) are arranged at intervals along the second direction (D2), and the battery cell further includes a tab structure (400), the tab structure (400) includes a first tab (410) and two second tabs (420), the first tab (410) is connected with the pole group body (210) and located between the two second protruding parts (222), the two second tabs (420) correspond to the two second protruding parts (222) one by one, each second tab (420) is connected to the side of a corresponding second protruding part (222) facing the other second protruding part (222), and the two sides of the first tab (410) in the second direction (D2) are connected with the two second tabs (420) respectively.

3. The electric cell of claim 2, wherein, ​ 4. The electric cell of claim 2, wherein, Along the third direction (D3), the distance between the sides of the first protruding part (221) and the second protruding part (222) facing away from each other is W1, and the size of the first protruding part (221) in the third direction (D3) is W2, 0.17≤W2 / W1≤0.

54.

5. The electric cell of claim 2, wherein, Along the second direction (D2), the distance between the sides of the two second protruding parts (222) facing each other is L, and the size of the pole group in the second direction (D2) is A, 0.29≤L / A≤0.

69.

6. The cell of any of claims 1-5, wherein, The battery shell (100) comprises a first side wall (110) and a second side wall (120), the first side wall (110) and the second side wall (120) are oppositely arranged along a third direction (D3), and the first direction (D1) and the second direction (D2) are both perpendicular to the third direction (D3). The first side wall (110) is provided with a first protruding part (111), the first protruding part (111) protrudes in a direction away from the second side wall (120), the first protruding part (111) extends from one side to the other side of the first side wall (110) along the second direction (D2), the second side wall (120) is provided with a second protruding part (121), the second protruding part (121) protrudes in a direction away from the first side wall (110), and the second protruding part (121) extends from one side to the other side of the second side wall (120) along the second direction (D2), the first protruding part (111) and the second protruding part (121) are staggered with each other in the first direction (D1).

7. The electric cell of claim 6, wherein, The pole group body (210) comprises a sub-pole group body (211), a first thickening part (212) and a second thickening part (213), the first thickening part (212) and the second thickening part (213) are respectively protruding on the opposite sides of the sub-pole group body (211) in the third direction (D3), the first thickening part (212) and the second thickening part (213) both extend from one side to the other side of the sub-pole group body (211) along the second direction (D2), the first thickening part (212) and the second thickening part (213) are staggered with each other in the first direction (D1), the first thickening part (212) is arranged opposite to the first protruding part (111) in the third direction (D3), and the second thickening part (213) is arranged opposite to the second protruding part (121) in the third direction (D3).

8. The electric cell of claim 7, wherein, The sub-pole group body (211) comprises a first pole group body (2111) and a second pole group body (2112), the first thickening part (212) and the second thickening part (213) are respectively protruding on the first pole group body (2111) and the second pole group body (2112), and the first pole group body (2111) and the second pole group body (2112) are distributed and conductively connected along the first direction (D1).

9. The electric cell of claim 8, wherein, The first pole group body (2111) comprises a first separator, a first positive electrode sheet and a first negative electrode sheet, the first separator is clamped between the first positive electrode sheet and the first negative electrode sheet, one side of the first pole group body (2111) facing the second pole group body (2112) is provided with a first conductive layer (2113) and a second conductive layer (2114), the first conductive layer (2113) and the second conductive layer (2114) are arranged at intervals, the first conductive layer (2113) is in conductive connection with the first positive electrode sheet, and the second conductive layer (2114) is in conductive connection with the first negative electrode sheet; The second pole group body (2112) comprises a second separator, a second positive electrode sheet and a second negative electrode sheet, the second separator is clamped between the second positive electrode sheet and the second negative electrode sheet, one side of the second pole group body (2112) facing the first pole group body (2111) is provided with a third conductive layer and a fourth conductive layer, the third conductive layer and the fourth conductive layer are arranged at intervals, the third conductive layer is in conductive connection with the second positive electrode sheet, and the fourth conductive layer is in conductive connection with the second negative electrode sheet; The first conductive layer (2113) and the third conductive layer are connected in adhesion, and the second conductive layer (2114) and the fourth conductive layer are connected in adhesion.

10. The electric cell of claim 7, wherein, Along the first direction (D1), the interval between the sides of the first thickening portion (212) and the second thickening portion (213) facing each other is E1, 5mm≤E1≤21mm.

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