A cover plate assembly and a battery

Abstract

The application discloses a cover plate assembly and a battery, and relates to the technical field of batteries, which comprises a cover plate, a compression ring and a pole, the cover plate is provided with mounting holes arranged through the front and back along the thickness direction; the pole is arranged in the mounting hole; the compression ring is arranged on the front side of the cover plate and is sleeved on the pole, and the compression ring is welded and fixed with the outer circumferential side of the pole; the width of the compression ring is W, the thickness of the compression ring is H1, the diameter of the pole is D, and the area of the front end face of the pole is S; the width W of the compression ring and the diameter D of the pole are controlled, so that the compression ring can provide sufficient welding area, the welding mark can reach sufficient connection width, the pole and the compression ring are connected stably, and the thickness H1 of the compression ring and the area S of the front end face of the pole are controlled, so that the welding mark can reach sufficient connection depth, the connection force of the welding mark is improved, and the problem of welding failure of the pole and the compression ring is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a cover plate assembly and a battery. BACKGROUND

[0002] A power battery is a battery that provides a power source for a tool, which generally includes a metal shell, an electric core arranged in the metal shell, and a cover plate assembly fixed to the top of the metal shell. The cover plate assembly is provided with a pole that is electrically connected to the electric core, so that the pole bears the function of power transmission of the power battery. The battery overcurrent area refers to the area through which the electrons pass during the charging and discharging process of the battery. The size of the battery overcurrent area directly affects the performance and safety of the battery. When designing the battery, in order to increase the overcurrent area of the battery, the area of the pole is generally increased.

[0003] The existing cover plate assembly generally has a pressure ring sleeved on the pole. By welding the pressure ring and the pole together, the pole can maintain good structural performance under a certain vertical pressure. However, when increasing the overcurrent area of the battery, the increased area of the pole may compress the area of the pressure ring, resulting in a decrease in the area of the pressure ring. In the case where the pressure ring and the pole rely only on the welding point as the connecting point, the too small area of the pressure ring can easily cause the pressure ring to be difficult to bear the vertical load of the pole, resulting in welding failure between the pressure ring and the pole. This situation is particularly prominent when the pole is welded with a busbar. SUMMARY

[0004] The purpose of the present application is to provide a cover plate assembly and a battery, which improves the cooperation between the pressure ring and the pole, so that the pressure ring and the pole can be connected tightly, avoiding the problem of welding failure between the pressure ring and the pole.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A cover plate assembly comprises:

[0007] A cover plate is provided with a mounting hole arranged through the front and back along the thickness direction thereof;

[0008] A pole is arranged in the mounting hole;

[0009] A pressure ring is arranged on the front side of the cover plate and sleeved on the pole, and the pressure ring and the outer peripheral side of the pole are welded and fixed;

[0010] The width of the pressure ring is W, the thickness of the pressure ring is H1, the diameter of the pole is D, and the area of the front end face of the pole is S, and the above parameters satisfy:

[0011]

[0012] The area S of the front end surface of the pole post is the area of the end surface corresponding to the diameter D of the pole post, and the width W of the compression ring is the shortest distance from the inner edge to the outer edge of the compression ring.

[0013] In some embodiments, the width W of the compression ring satisfies 2≤W≤4 mm, and the diameter D of the pole post satisfies 10≤D≤30 mm.

[0014] In some embodiments, the thickness H1 of the compression ring satisfies 1.5≤H1≤3 mm, and the area S of the front end surface of the pole post satisfies 79≤S≤706 mm 2 .

[0015] In some embodiments, the outer contour of the compression ring is circular or polygonal.

[0016] In some embodiments, further comprising an insulating member arranged between the compression ring and the cover plate to separate the compression ring and the cover plate; and,

[0017] The elastic modulus of the insulating member is E, and the elastic modulus E satisfies 1≤E≤20 GPa.

[0018] In some embodiments, the cover plate comprises a supporting portion, the rear side of the insulating member is attached to the supporting portion, and the front side of the insulating member is attached to the compression ring; and,

[0019] The thickness of the supporting portion is H2, and the thickness H2 of the supporting portion satisfies 0.5≤H2≤2 mm.

[0020] In some embodiments, the pole post comprises:

[0021] A body portion arranged in the front-rear direction and passing through the mounting hole;

[0022] A limiting portion formed at the rear end of the body portion and extending towards the outside of the body portion, and,

[0023] A sealing member is arranged between the limiting portion and the cover plate.

[0024] In some embodiments, the front end surface of the pole post is provided with a protruding portion extending towards the front side in the thickness direction thereof, and a step is formed in cooperation with the outer peripheral side of the pole post.

[0025] In some embodiments, the thickness of the protruding portion is H3, and the thickness H3 of the protruding portion satisfies 0.2≤H3≤1 mm.

[0026] In some embodiments, the rear end surface of the pole post is recessed towards the front side in the thickness direction thereof, forming a recessed portion.

[0027] In some embodiments, the thickness of the compression ring is H1, the area of the front end surface of the pole is S, and the above parameters satisfy: .

[0028] In some embodiments, the depth of the recess is H4, and the depth H4 of the recess satisfies: 1≤H4≤4mm.

[0029] Based on the above-mentioned cover plate assembly, the application further provides a battery comprising any one of the above-mentioned cover plate assemblies.

[0030] Compared with the prior art, the cover plate assembly and the battery provided by the application have the following beneficial effects:

[0031] The cover plate assembly provided by the application controls the width W of the compression ring and the diameter D of the pole in a suitable range, so that when the pole and the compression ring are welded and fixed, the compression ring can provide sufficient welding area, the welding mark can reach sufficient connection width, the connection between the pole and the compression ring is stable, and the thickness H1 of the compression ring and the area S of the front end surface of the pole are controlled in a suitable range, so that the welding mark can reach sufficient connection depth, the connection force of the welding mark is further improved, the welding structure between the pole and the compression ring of the cover plate assembly has sufficient connection strength and connection quality even when the busbar is assembled, and the problem of welding failure between the pole and the compression ring is effectively avoided.

[0032] Moreover, the cover plate assembly provided by the application sets the recess on the pole, reduces the weight of the pole, thereby reducing the traction force of the pole on the welding mark, the area of the compression ring can be further reduced, the area of the pole can be further expanded, and the overcurrent area of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic view of the cover plate assembly in the embodiment of the application;

[0034] Figure 2 is a top view of the cover plate assembly in the embodiment of the application;

[0035] Figure 3 is Figure 2 a schematic view of the A-A section in FIG. 1;

[0036] Figure 4 is Figure 3 another example schematic view of the structure shown in FIG. 1;

[0037] Figure 5 is a schematic view of the cover plate in the embodiment of the application;

[0038] Figure 6 is a schematic view of the compression ring in the embodiment of the application;

[0039] Figure 7 is a schematic view of a pole in the embodiment of the present application.

[0040] In the figure, 100, cover plate assembly;

[0041] 1, cover plate; 10, bearing portion; 2, pole; 20, body portion; 21, limiting portion; 22, recessed portion; 23, protruding portion; 3, press ring; 4, insulating member; 5, welding mark; 6, sealing member; 7, mounting hole; 8, step. DETAILED DESCRIPTION

[0042] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0043] In the description of the present application, it should be understood that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like in the present application are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In the description of the present application, it should be understood that the terms "first", "second" in the present application are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0046] EMBODIMENT

[0047] As Figures 1-7As shown, the embodiment of the present application provides a cover plate assembly 100 suitable for a power battery. The output interface of the power battery is oriented to the front side, and the side opposite to the front side is the rear side. The cover plate assembly 100 comprises a cover plate 1, a pole 2, a compression ring 3 and an insulating piece 4. The cover plate 1 is provided with a mounting hole 7 arranged through the front and rear along the thickness direction of the cover plate 1. The pole 2 is arranged in the mounting hole 7, so that part of the pole 2 passes through the mounting hole 7 and extends to the front side of the mounting hole 7. The compression ring 3 is arranged on the front side of the cover plate 1 and is sleeved on the pole 2. The compression ring 3 is welded and fixed with the outer circumferential side of the pole 2.

[0048] It can be understood that the welding strength between the compression ring 3 and the pole 2 affects the structural stability of the pole 2. Especially when the cover plate assembly 100 needs to be assembled with a busbar, the busbar is welded to the front end face of the pole 2, which increases the weight of the pole 2. Moreover, the busbar may generate a certain pulling force in the working process, so that the pole 2 bears more load in the thickness direction. In order to ensure that the compression ring 3 and the pole 2 have sufficient connecting force, the compression ring 3 and the pole 2 need to be matched with each other. The width of the compression ring 3 is W, the thickness of the compression ring 3 is H1, the diameter of the pole 2 is D, and the area of the front end face of the pole 2 is S. The above parameters satisfy:

[0049]

[0050] The area S of the front end face of the pole 2 is the end face area corresponding to the diameter D of the pole 2, and the width W of the compression ring 3 is the shortest distance from the inner edge of the compression ring 3 to the outer edge thereof.

[0051] By matching the compression ring 3 with the pole 2, the welding mark 5 between the compression ring 3 and the pole 2 can have sufficient connecting force, so that the compression ring 3 and the pole 2 are stably connected. Even if the pole 2 is pulled by the busbar, the welding mark 5 is not easy to fail. Moreover, by matching the compression ring 3 with the pole 2, when the area S of the pole 2 is adjusted, the compression ring 3 can meet the connection requirements of the pole 2, so that the compression ring 3 and the pole 2 are stably connected.

[0052] Generally, the compression ring 3 has a circular ring structure, so as to be sleeved on the pole 2. Therefore, the width W of the compression ring 3 is the ring width of the compression ring 3. Of course, the outer contour of the compression ring 3 can also be polygonal, so as to facilitate the matching between the compression ring 3 and the cover plate 1. For example, the compression ring 3 with a polygonal outer contour can prevent the compression ring 3 from rotating relative to the pole 2, so as to avoid the rotation of the compression ring 3 relative to the pole 2, which causes the welding mark 5 to fail. Of course, in the case that the outer contour of the compression ring 3 is polygonal, the width of the compression ring 3 is still the shortest distance from the inner edge of the compression ring 3 to the outer edge thereof.

[0053] According to the specification of the power battery, in order to ensure that the structural strength of the compression ring 3 can meet the force bearing requirement, as an example of the embodiment, the width W of the compression ring 3 can meet: 2≤W≤4mm, for example, the width W of the compression ring 3 can adopt one of the sizes of 2mm, 2.5mm, 3mm, 3.5mm, 4mm, so as to be matched with the power battery. Of course, in addition to considering the width W of the compression ring 3, the structural strength of the compression ring also needs to consider the thickness H1 of the compression ring, as an example of the embodiment, the thickness H1 of the compression ring can meet: 1.5≤H1≤3mm, for example, the thickness H1 of the compression ring can adopt one of the sizes of 1.5mm, 2mm, 2.5mm, 3mm,

[0054] It can be understood that in the power battery, the compression ring 3 and the pole 2 are matched with each other, and the structural strength of the pole 2 also needs to meet the force bearing requirement. As an example of the embodiment, the diameter D of the pole 2 can meet: 10≤D≤30mm, for example, the diameter D of the pole can adopt one of the sizes of 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, so as to match the compression ring 3 and the pole 2 with each other. In addition, the area S of the front end face of the pole 2 can meet: 79≤S≤706mm 2 , for example, the area S of the front end face of the pole 2 can adopt one of the sizes of 79mm 2 , 80mm 2 , 81mm 2 , 82mm 2 , 83mm 2 , 84mm 2 , 85mm 2 , 86mm 2 , 87mm 2 , 88mm 2 , 89mm 2 , 90mm 2 , 91mm 2 , 92mm 2 , 93mm 2 , 94mm 2 , 95mm 2 , 96mm 2 , 97mm 2 , 98mm 2 , 99mm 2 , 100mm 2 , 101mm 2 , 102mm 2 , 103mm 2 , 104mm2 , 105 mm 2 , 106 mm 2 , 107 mm 2 , 108 mm 2 , 109 mm 2 , 110 mm 2 , 111 mm 2 , 112 mm 2 , 113 mm 2 , 114 mm 2 , 115 mm 2 , 116 mm 2 , 117 mm 2 , 118 mm 2 , 119 mm 2 , 120 mm 2 , 121 mm 2 , 122 mm 2 , 123 mm 2 , 124 mm 2 , 125 mm 2 , 126 mm 2 , 127 mm 2 , 128 mm 2 , 129 mm 2 , 130 mm 2 , 131 mm 2 , 132 mm 2 , 133 mm 2 , 134 mm 2 , 135 mm 2 , 136 mm 2 , 137 mm 2 , 138 mm 2 , 139 mm 2 , 140 mm 2 , 141 mm 2 , 142 mm 2 , 143 mm 2 , 144 mm 2 , 145 mm 2 , 146 mm 2 , 147 mm 2 , 148 mm 2 , 149 mm 2 , 150 mm 2 , 151 mm 2 , 152 mm 2 , 153 mm 2 , 154 mm 2 , 155 mm 2 , 156 mm 2, 157 mm 2 , 158 mm 2 , 159 mm 2 , 160 mm 2 , 161 mm 2 , 162 mm 2 , 163 mm 2 , 164 mm 2 , 165 mm 2 , 166 mm 2 , 167 mm 2 , 168 mm 2 , 169 mm 2 , 170 mm 2 , 171 mm 2 , 172 mm 2 , 173 mm 2 , 174 mm 2 , 175 mm 2 , 176 mm 2 , 177 mm 2 , 178 mm 2 , 179 mm 2 , 180 mm 2 , 181 mm 2 , 182 mm 2 , 183 mm 2 , 184 mm 2 , 185 mm 2 , 186 mm 2 , 187 mm 2 , 188 mm 2 , 189 mm 2 , 190 mm 2 , 191 mm 2 , 192 mm 2 , 193 mm 2 , 194 mm 2 , 195 mm 2 , 196 mm 2 , 197 mm 2 , 198 mm 2 , 199 mm 2 , 200 mm 2 , 201 mm 2 , 202 mm 2 , 203 mm 2 , 204 mm 2 , 205 mm 2 , 206 mm 2 , 207 mm 2 , 208 mm 2 , 209 mm2 210 mm 2 211 mm 2 212 mm 2 213 mm 2 214 mm 2 215 mm 2 216 mm 2 217 mm 2 218 mm 2 219 mm 2 220 mm 2 221 mm 2 222 mm 2 223 mm 2 224 mm 2 225 mm 2 226 mm 2 227 mm 2 228 mm 2 229 mm 2 230 mm 2 231 mm 2 232 mm 2 233 mm 2 234 mm 2 235 mm 2 236 mm 2 237 mm 2 238 mm 2 239 mm 2 240 mm 2 241 mm 2 242 mm 2 243 mm 2 244 mm 2 245 mm 2 246 mm 2 247 mm 2 248 mm 2 249 mm 2 250 mm 2 251 mm 2 252 mm 2 253 mm 2 254 mm 2 255 mm 2 256 mm 2 257 mm 2 258 mm 2 259 mm 2 260 mm 2 261 mm 2, 262 mm 2 , 263 mm 2 , 264 mm 2 , 265 mm 2 , 266 mm 2 , 267 mm 2 , 268 mm 2 , 269 mm 2 , 270 mm 2 , 271 mm 2 , 272 mm 2 , 273 mm 2 , 274 mm 2 , 275 mm 2 , 276 mm 2 , 277 mm 2 , 278 mm 2 , 279 mm 2 , 280 mm 2 , 281 mm 2 , 282 mm 2 , 283 mm 2 , 284 mm 2 , 285 mm 2 , 286 mm 2 , 287 mm 2 , 288 mm 2 , 289 mm 2 , 290 mm 2 , 291 mm 2 , 292 mm 2 , 293 mm 2 , 294 mm 2 , 295 mm 2 , 296 mm 2 , 297 mm 2 , 298 mm 2 , 299 mm 2 , 300 mm 2 , 301 mm 2 , 302 mm 2 , 303 mm 2 , 304 mm 2 , 305 mm 2 , 306 mm 2 , 307 mm 2 , 308 mm 2 , 309 mm 2 , 310 mm 2 , 311 mm 2 , 312 mm 2 , 313 mm 2 , 314 mm2 , 315 mm 2 , 316 mm 2 , 317 mm 2 , 318 mm 2 , 319 mm 2 , 320 mm 2 , 321 mm 2 , 322 mm 2 , 323 mm 2 , 324 mm 2 , 325 mm 2 , 326 mm 2 , 327 mm 2 , 328 mm 2 , 329 mm 2 , 330 mm 2 , 331 mm 2 , 332 mm 2 , 333 mm 2 , 334 mm 2 , 335 mm 2 , 336 mm 2 , 337 mm 2 , 338 mm 2 , 339 mm 2 , 340 mm 2 , 341 mm 2 , 342 mm 2 , 343 mm 2 , 344 mm 2 , 345 mm 2 , 346 mm 2 , 347 mm 2 , 348 mm 2 , 349 mm 2 , 350 mm 2 , 351 mm 2 , 352 mm 2 , 353 mm 2 , 354 mm 2 , 355 mm 2 , 356 mm 2 , 357 mm 2 , 358 mm 2 , 359 mm 2 , 360 mm 2 , 361 mm 2 , 362 mm 2 , 363 mm 2 , 364 mm 2 , 365 mm 2 , 366 mm 2, 367 mm 2 , 368 mm 2 , 369 mm 2 , 370 mm 2 , 371 mm 2 , 372 mm 2 , 373 mm 2 , 374 mm 2 , 375 mm 2 , 376 mm 2 , 377 mm 2 , 378 mm 2 , 379 mm 2 , 380 mm 2 , 381 mm 2 , 382 mm 2 , 383 mm 2 , 384 mm 2 , 385 mm 2 , 386 mm 2 , 387 mm 2 , 388 mm 2 , 389 mm 2 , 390 mm 2 , 391 mm 2 , 392 mm 2 , 393 mm 2 , 394 mm 2 , 395 mm 2 , 396 mm 2 , 397 mm 2 , 398 mm 2 , 399 mm 2 , 400 mm 2 , 401 mm 2 , 402 mm 2 , 403 mm 2 , 404 mm 2 , 405 mm 2 , 406 mm 2 , 407 mm 2 , 408 mm 2 , 409 mm 2 , 410 mm 2 , 411 mm 2 , 412 mm 2 , 413 mm 2 , 414 mm 2 , 415 mm 2 , 416 mm 2 , 417 mm 2 , 418 mm 2 , 419 mm2 , 420 mm 2 , 421 mm 2 , 422 mm 2 , 423 mm 2 , 424 mm 2 , 425 mm 2 , 426 mm 2 , 427 mm 2 , 428 mm 2 , 429 mm 2 , 430 mm 2 , 431 mm 2 , 432 mm 2 , 433 mm 2 , 434 mm 2 , 435 mm 2 , 436 mm 2 , 437 mm 2 , 438 mm 2 , 439 mm 2 , 440 mm 2 , 441 mm 2 , 442 mm 2 , 443 mm 2 , 444 mm 2 , 445 mm 2 , 446 mm 2 , 447 mm 2 , 448 mm 2 , 449 mm 2 , 450 mm 2 , 451 mm 2 , 452 mm 2 , 453 mm 2 , 454 mm 2 , 455 mm 2 , 456 mm 2 , 457 mm 2 , 458 mm 2 , 459 mm 2 , 460 mm 2 , 461 mm 2 , 462 mm 2 , 463 mm 2 , 464 mm 2 , 465 mm 2 , 466 mm 2 , 467 mm 2 , 468 mm 2 , 469 mm 2 , 470 mm 2 , 471 mm 2, 472 mm 2 , 473 mm 2 , 474 mm 2 , 475 mm 2 , 476 mm 2 , 477 mm 2 , 478 mm 2 , 479 mm 2 , 480 mm 2 , 481 mm 2 , 482 mm 2 , 483 mm 2 , 484 mm 2 , 485 mm 2 , 486 mm 2 , 487 mm 2 , 488 mm 2 , 489 mm 2 , 490 mm 2 , 491 mm 2 , 492 mm 2 , 493 mm 2 , 494 mm 2 , 495 mm 2 , 496 mm 2 , 497 mm 2 , 498 mm 2 , 499 mm 2 , 500 mm 2 , 501 mm 2 , 502 mm 2 , 503 mm 2 , 504 mm 2 , 505 mm 2 , 506 mm 2 , 507 mm 2 , 508 mm 2 , 509 mm 2 , 510 mm 2 , 511 mm 2 , 512 mm 2 , 513 mm 2 , 514 mm 2 , 515 mm 2 , 516 mm 2 , 517 mm 2 , 518 mm 2 , 519 mm 2 , 520 mm 2 , 521 mm 2 , 522 mm 2 , 523 mm 2 , 524 mm2 525 mm 2 526 mm 2 527 mm 2 528 mm 2 529 mm 2 530 mm 2 531 mm 2 532 mm 2 533 mm 2 534 mm 2 535 mm 2 536 mm 2 537 mm 2 538 mm 2 539 mm 2 540 mm 2 541 mm 2 542 mm 2 543 mm 2 544 mm 2 545 mm 2 546 mm 2 547 mm 2 548 mm 2 549 mm 2 550 mm 2 551 mm 2 552 mm 2 553 mm 2 554 mm 2 555 mm 2 556 mm 2 557 mm 2 558 mm 2 559 mm 2 560 mm 2 561 mm 2 562 mm 2 563 mm 2 564 mm 2 565 mm 2 566 mm 2 567 mm 2 568 mm 2 569 mm 2 570 mm 2 571 mm 2 572 mm 2 573 mm 2 574 mm 2 575 mm 2 576 mm 2, 577 mm 2 , 578 mm 2 , 579 mm 2 , 580 mm 2 , 581 mm 2 , 582 mm 2 , 583 mm 2 , 584 mm 2 , 585 mm 2 , 586 mm 2 , 587 mm 2 , 588 mm 2 , 589 mm 2 , 590 mm 2 , 591 mm 2 , 592 mm 2 , 593 mm 2 , 594 mm 2 , 595 mm 2 , 596 mm 2 , 597 mm 2 , 598 mm 2 , 599 mm 2 , 600 mm 2 , 601 mm 2 , 602 mm 2 , 603 mm 2 , 604 mm 2 , 605 mm 2 , 606 mm 2 , 607 mm 2 , 608 mm 2 , 609 mm 2 , 610 mm 2 , 611 mm 2 , 612 mm 2 , 613 mm 2 , 614 mm 2 , 615 mm 2 , 616 mm 2 , 617 mm 2 , 618 mm 2 , 619 mm 2 , 620 mm 2 , 621 mm 2 , 622 mm 2 , 623 mm 2 , 624 mm 2 , 625 mm 2 , 626 mm 2 , 627 mm 2 , 628 mm 2 , 629 mm2 , 630 mm 2 , 631 mm 2 , 632 mm 2 , 633 mm 2 , 634 mm 2 , 635 mm 2 , 636 mm 2 , 637 mm 2 , 638 mm 2 , 639 mm 2 , 640 mm 2 , 641 mm 2 , 642 mm 2 , 643 mm 2 , 644 mm 2 , 645 mm 2 , 646 mm 2 , 647 mm 2 , 648 mm 2 , 649 mm 2 , 650 mm 2 , 651 mm 2 , 652 mm 2 , 653 mm 2 , 654 mm 2 , 655 mm 2 , 656 mm 2 , 657 mm 2 , 658 mm 2 , 659 mm 2 , 660 mm 2 , 661 mm 2 , 662 mm 2 , 663 mm 2 , 664 mm 2 , 665 mm 2 , 666 mm 2 , 667 mm 2 , 668 mm 2 , 669 mm 2 , 670 mm 2 , 671 mm 2 , 672 mm 2 , 673 mm 2 , 674 mm 2 , 675 mm 2 , 676 mm 2 , 677 mm 2 , 678 mm 2 , 679 mm 2 , 680 mm 2 , 681 mm 2, 682 mm 2 , 683 mm 2 , 684 mm 2 , 685 mm 2 , 686 mm 2 , 687 mm 2 , 688 mm 2 , 689 mm 2 , 690 mm 2 , 691 mm 2 , 692 mm 2 , 693 mm 2 , 694 mm 2 , 695 mm 2 , 696 mm 2 , 697 mm 2 , 698 mm 2 , 699 mm 2 , 700 mm 2 , 701 mm 2 , 702 mm 2 , 703 mm 2 , 704 mm 2 , 705 mm 2 , 706 mm 2 one of the dimensions to ensure that the area S of the front end face of the pole 2 meets the connection requirements with the busbar.

[0055] With reference to Figure 3 As an example of the present embodiment, the cover plate assembly 100 further comprises an insulating piece 4 arranged between the compression ring 3 and the cover plate 1 to separate the compression ring 3 and the cover plate 1, and the insulating piece 4 has a certain elasticity, the elastic modulus of which is E, and the elastic modulus E satisfies: 1≤E≤20GPa, so that the insulating piece 4 can buffer the cover plate 1 to avoid the compression ring 3 directly pressing the cover plate 1, causing the cover plate 1 to deform and affecting the assembly effect of the cover plate assembly 100.

[0056] With reference to Figures 4-5 As an example of the present embodiment, the cover plate 1 comprises a supporting portion 10, the rear side of the insulating piece 4 is attached to the supporting portion 10, and the front side of the insulating piece 4 is attached to the compression ring 3; and the thickness of the supporting portion 10 is H2, and the thickness H2 of the supporting portion 10 satisfies: 0.5≤H2≤2mm. For example, the thickness H2 of the supporting portion 10 can adopt one of the dimensions of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm.

[0057] The thickness H1 of the compression ring 3 affects the weight of the compression ring 3, and the greater the weight of the compression ring 3, the greater the load on the supporting portion 10 of the cover plate 1. Therefore, in order to ensure that the supporting portion 10 is not easily deformed after being pressed, the thickness of the supporting portion 10 should be adjusted according to the thickness H1 of the compression ring 3, so that the thickness H1 of the compression ring 3 and the thickness H2 of the supporting portion 10 can match each other, so that the supporting portion 10 can bear the compression ring 3 and is not easily deformed.

[0058] Reference Figure 7 As an example of the present embodiment, the pole post 2 includes a body portion 20 and a limiting portion 21, wherein the body portion 20 is a column structure, and the diameter D of the pole post 2 is the diameter of the body portion 20; the body portion 20 is arranged along the front-rear direction and is provided in the mounting hole 7; the limiting portion 21 is formed at the rear end of the body portion 20 and extends towards the outside of the body portion 20, and a sealing element 6 is arranged between the limiting portion 21 and the cover plate 1.

[0059] It can be understood that after the present cover plate assembly 100 is assembled with the battery and the pole post 2 is assembled with the busbar, during use of the battery, the busbar pulls the front end face of the pole post 2, which will exert a pulling force on the pole post 2 towards the front side, which will cause the pole post 2 to press the rear end face of the cover plate 1, which is easy to cause the cover plate 1 to deform. Therefore, the sealing element 6 can be arranged between the pole post 2 and the cover plate 1, so that when the pole post 2 is subjected to a pulling force towards the front side, the limiting portion 21 presses the sealing element 6, avoiding the limiting portion 21 directly pressing the cover plate 1, and the sealing element 6 enhances the sealing between the pole post 2 and the cover plate 1. Of course, considering the sealing of the limiting portion 21 and the sealing element 6, the sealing element 6 can be made of an elastic material, so that when the sealing element 6 is pressed by the limiting portion 21, it can elastically deform, so that the sealing element 6 is more fitted to the outer surface of the limiting portion 21, ensuring the sealing between the sealing element 6 and the limiting portion 21.

[0060] Reference Figure 7 As an example of the present embodiment, the front end face of the pole post 2 is provided with a protruding portion 23, which extends towards the front side along the thickness direction thereof and cooperates with the outer circumferential side of the pole post 2 to form a step 8.

[0061] The protruding portion 23 protrudes from the front end face of the pole post 2 and can serve as a welding area of the pole post 2 and the busbar. In this way, when the pole post 2 is pulled by the busbar, the pulling force exerted by the busbar on the pole post 2 is directly applied to the pole post 2 itself through the protruding portion 23, without affecting the weld 5 between the compression ring 3 and the pole post 2. Moreover, when an interaction force is generated between the compression ring 3 and the pole post 2, the interaction force between the compression ring 3 and the pole post 2 will not be transmitted to the protruding portion 23, without affecting the connection between the pole post 2 and the busbar, effectively avoiding the problem that the busbar and the compression ring 3 affect each other, resulting in failure of the connection between them.

[0062] Of course, the protrusion 23 arranged at the front end surface of the pole 2 also occupies a certain space of the battery pack, and thus the thickness H3 of the protrusion 23 needs to be configured within a proper range to avoid that the thickness of the protrusion 23 is too high to excessively occupy the space of the battery pack, reduce the space utilization of the battery pack, or the thickness of the protrusion 23 is too large to effectively separate the bus bar and the compression ring 3. As an example of the present embodiment, the thickness H3 of the protrusion 23 can satisfy: 0.2≤H3≤1mm. For example, the thickness H3 of the protrusion 23 can be one of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1mm.

[0063] Reference Figure 4 As another example of the present embodiment, the rear end surface of the pole 2 is recessed towards the front side along the thickness direction to form a recess 22, so as to reduce the weight of the pole 2, and thus the same specification compression ring 3 can bear a larger pole 2. In this way, the volume of the compression ring 3 can be reduced by adjusting the width W of the compression ring 3, so as to appropriately increase the area S of the front end surface of the pole 2 and increase the overcurrent area of the battery.

[0064] In the case that the weight of the pole 2 is reduced, the force of the pole 2 on the welding mark 5 is also reduced accordingly, and thus the thickness H1 of the compression ring 3 can be appropriately reduced to reduce the volume of the compression ring 3 by adjusting the thickness H1 of the compression ring 3. As an example of the present embodiment, the thickness H1 of the compression ring and the area S of the front end surface of the pole can satisfy:

[0065]

[0066] Of course, the recess 22 is also related to the size of the pole 2 itself and affects the structural stability of the pole 2. Therefore, the depth of the recess 22 should be considered to be maintained within a proper range to avoid that the weight of the pole 2 is not obviously changed due to the too small specification of the recess 22, or the structural strength of the pole 2 is weakened due to the too large specification of the recess 22. For example, as an example of the present embodiment, the depth H4 of the recess 22 can satisfy: 1≤H4≤4mm. For example, the depth H4 of the recess 22 can be one of 1mm, 2mm, 3mm, and 4mm.

[0067] In summary, the cover plate assembly 100 of the present embodiment controls the width W of the compression ring 3 and the diameter D of the pole 2 within a suitable range, so that when the pole 2 and the compression ring 3 are welded together, the compression ring 3 can provide sufficient welding area, and the weld 5 can achieve sufficient connection width, to ensure that the pole 2 and the compression ring 3 are connected stably, and the cover plate assembly 100 of the present embodiment controls the thickness H1 of the compression ring 3 and the area S of the front end face of the pole 2 within a suitable range, so that the weld 5 can achieve sufficient connection depth, further improve the connection force of the weld 5, so that the cover plate assembly 100 of the present embodiment, even if the busbar is assembled, the welding structure between the pole 2 and the compression ring 3 has sufficient connection strength and connection quality, effectively avoids the problem of welding failure between the pole 2 and the compression ring 3.

[0068] Furthermore, the cover plate assembly 100 of the present embodiment sets the recess 22 on the pole 2, reduces the weight of the pole 2, thereby reducing the traction of the pole 2 on the weld 5, so that the area of the compression ring 3 can be further reduced, and the area of the pole 2 can be further enlarged, thereby increasing the overcurrent area of the battery.

[0069] The above description is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can also be made, and these improvements and replacements should be considered as the protection scope of the present application.

Claims

1. A cover plate assembly, characterized in that, include: A cover plate, wherein the cover plate is provided with mounting holes arranged through the front and back along its thickness direction; A terminal post, which passes through the mounting hole; A pressure ring is arranged on the front side of the cover plate and sleeved on the pole post. The pressure ring is welded and fixed to the outer periphery of the pole post, so that a weld mark is formed between the pressure ring and the pole post. In the thickness direction of the cover plate, the projection of the welding position of the pressure ring and the pole post is located in the mounting hole. An insulating element is disposed between the pressure ring and the cover plate, thereby separating the pressure ring from the cover plate; The width of the pressure ring is W, the thickness of the pressure ring is H1, the diameter of the electrode post is D, and the area of ​​the front end face of the electrode post is S, and the above parameters satisfy: Wherein, the area S of the front end face of the pole is the area of ​​the end face corresponding to the diameter D of the pole, and the width W of the pressure ring is the shortest distance from the inner edge to the outer edge of the pressure ring.

2. The cover plate assembly according to claim 1, characterized in that, The width W of the pressure ring satisfies: 2≤W≤4mm, and the diameter D of the pole satisfies: 10≤D≤30mm.

3. The cover plate assembly according to claim 1, characterized in that, The area S of the front end face of the pole satisfies: 79 ≤ S ≤ 706 mm 2 .

4. The cover plate assembly according to claim 1, characterized in that, The outer contour of the pressure ring is circular or polygonal.

5. The cover plate assembly according to claim 1, characterized in that, The elastic modulus of the insulating component is E, and the elastic modulus E satisfies: 1≤E≤20GPa.

6. The cover plate assembly according to claim 5, characterized in that, The cover plate includes a support portion, the rear side of the insulating member is attached to the support portion, and the front side of the insulating member is attached to the pressure ring; and, The thickness of the support portion is H2, and the thickness H2 of the support portion satisfies: 0.5≤H2≤2mm.

7. The cover plate assembly according to claim 1, characterized in that, The pole includes: The main body is arranged in the front-to-back direction and passes through the mounting hole; A limiting portion is formed at the rear end of the body portion and extends outward from the body portion. A sealing element is provided between the limiting part and the cover plate.

8. The cover plate assembly according to claim 1, characterized in that, The front end face of the pole post is provided with a protrusion, which extends forward along its thickness direction and forms a step with the outer periphery of the pole post.

9. The cover plate assembly according to claim 8, characterized in that, The thickness of the protrusion is H3, and the thickness H3 of the protrusion satisfies: 0.2≤H3≤1mm.

10. The cover plate assembly according to claim 1, characterized in that, The rear end face of the pole is recessed towards the front along its thickness direction, forming a recessed portion.

11. The cover plate assembly according to claim 10, characterized in that, The area of ​​the front end face of the pole post is S, and the above parameters satisfy:

12. The cover plate assembly according to claim 10, characterized in that, The depth of the recess is H4, and the depth H4 of the recess satisfies: 1≤H4≤4mm.

13. A battery, characterized in that, Includes the electrode tab and the cover plate assembly as described in any one of claims 1-12.

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