WO2021114328A1 - 卷绕式豆式电池 - Google Patents

卷绕式豆式电池 Download PDF

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Publication number
WO2021114328A1
WO2021114328A1 PCT/CN2019/126222 CN2019126222W WO2021114328A1 WO 2021114328 A1 WO2021114328 A1 WO 2021114328A1 CN 2019126222 W CN2019126222 W CN 2019126222W WO 2021114328 A1 WO2021114328 A1 WO 2021114328A1
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Prior art keywords
surrounding wall
arc
wound
shaped
wall
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PCT/CN2019/126222
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English (en)
French (fr)
Inventor
冯彪
葛辉明
袁中直
刘金成
Original Assignee
惠州亿纬锂能股份有限公司
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Priority claimed from CN201911284157.0A external-priority patent/CN110854305A/zh
Priority claimed from CN201922250372.0U external-priority patent/CN211017129U/zh
Application filed by 惠州亿纬锂能股份有限公司 filed Critical 惠州亿纬锂能股份有限公司
Publication of WO2021114328A1 publication Critical patent/WO2021114328A1/zh

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  • This application relates to the field of battery technology, for example, to a wound bean battery.
  • Button battery also called button battery, refers to a battery whose shape and size are like a small button.
  • the button battery generally includes a bottom shell, a cap, and a battery cell arranged in a containing cavity formed by the two. Because the size of the button battery is very small, it is very difficult to seal.
  • the assembly process of the button battery is as follows: the sealing ring is sleeved on the bottom case, after operations such as placing the battery, the cap is placed on the bottom case for sealing treatment.
  • the related button battery contains a sealing ring, its sealing effect is still general, which easily causes battery leakage and affects the service life of the button battery.
  • the sealing ring is also prone to breakage during sealing, resulting in sealing failure.
  • the application provides a wound bean battery with simple structure and good sealing effect.
  • the present application provides a wound bean-type battery, including a bottom shell and a cap, a space for accommodating a wound battery is formed between the bottom shell and the cover, and a tab of the wound battery is connected to The cap is connected, and the other tab is connected with the bottom shell.
  • the bottom shell includes a bottom plate and a first surrounding wall ringed on one side of the bottom plate.
  • the cover cap includes a top plate and a top plate ringed on the top plate.
  • a second surrounding wall on one side, the second surrounding wall is sleeved outside the first surrounding wall, and a plurality of continuous first arc-shaped portions are provided on the first surrounding wall along the axial direction thereof, the A plurality of second arc-shaped parts that cooperate with the first arc-shaped part are arranged on the second surrounding wall along its axial direction, and a sealing element is sandwiched between the first surrounding wall and the second surrounding wall.
  • the first arc-shaped portion is annularly arranged on the first surrounding wall, and a plurality of the first arc-shaped portions are parallel along the axial direction of the first surrounding wall; or,
  • a plurality of the first arc-shaped portions are spirally wound on the first surrounding wall along the axial direction of the first surrounding wall; or,
  • the first arc-shaped portion includes a plurality of sub-arc-shaped portions arranged at annular intervals along the circumferential direction of the first surrounding wall.
  • the first arc-shaped part is formed by stamping or rolling of the first surrounding wall
  • the second arc-shaped part is formed by stamping or rolling of the second surrounding wall.
  • All the first arc-shaped parts are protruding toward the center of the first surrounding wall, and all the second arc-shaped parts are protruding toward the center of the second surrounding wall; or,
  • All the first arc-shaped parts are protruding toward the center away from the first surrounding wall, and all the second arc-shaped parts are protruding toward the center away from the second surrounding wall; or,
  • the protruding directions of the two adjacent first arc-shaped portions on the first surrounding wall are opposite, and a plurality of the first arc-shaped portions form a first wave-shaped structure on the first surrounding wall, so The plurality of second arc-shaped portions on the second surrounding wall form a second wave-shaped structure that matches with the first wave-shaped structure.
  • the hardness of the first surrounding wall is greater than the hardness of the second surrounding wall.
  • An end of the second surrounding wall away from the top plate is formed with a necked portion, and the end of the necked portion abuts against the outer wall of the first surrounding wall or the outer wall of the bottom plate; or,
  • a crimping structure is provided at one end of the second surrounding wall away from the top plate, and the crimping structure abuts against the outer wall of the first surrounding wall.
  • the sealing element includes a sealing body sandwiched between the first surrounding wall and the second surrounding wall, and an end of the sealing body close to the top plate has a first extension extending toward the center of the sealing body An end of the first extension portion away from the sealing body extends toward the bottom plate with a second extension portion, and the second extension portion is tightly attached to the inner wall of the first surrounding wall.
  • Both the bottom shell and the cap are made of metal materials.
  • the pole piece of the wound cell includes a current collector and an active material coated on the current collector, and the current collector has a radial direction extending from the wound cell to the outside of the active material.
  • the extension part is partially overlapped after being bent, the extension part and the pole piece are arranged at an angle, and the extension part is bent to form the pole ear.
  • the wound cell includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet, and the separator has an axial direction of the wound cell extending to the negative electrode. Isolation portions at both ends of the sheet, the isolation portions are used to isolate the tabs of the wound cell and the end surface of the wound cell.
  • corresponding arc-shaped parts are provided on the first and second surrounding walls.
  • the arc-shaped parts can press the sealing element between the first and second surrounding walls, which significantly improves the bottom.
  • the seal between the shell and the cap, and the arc-shaped part can also protect the seal, prevent the seal from being damaged when the cap is sealed, extend the service life of the seal, and also ensure the gap between the bottom shell and the cap The seal does not fail.
  • FIG. 1 is a schematic cross-sectional view of a wound bean battery according to an embodiment of the application.
  • Figure 2 is an exploded schematic diagram of Figure 1;
  • FIG. 3 is a schematic cross-sectional view of a wound bean battery according to another embodiment of the application.
  • Fig. 4 is an exploded schematic diagram of Fig. 3;
  • FIG. 5 is a schematic cross-sectional view of a wound bean battery according to another embodiment of the application.
  • Fig. 6 is an exploded schematic diagram of Fig. 5;
  • FIG. 7 is a schematic cross-sectional view of a wound bean battery according to another embodiment of the application.
  • FIG. 8 is a schematic cross-sectional view of a wound bean battery according to another embodiment of the application.
  • FIG. 9 is a schematic diagram of the structure of a pole piece and a pole lug according to an embodiment of the application.
  • FIG. 10 is a schematic diagram of the structure of a pole piece and a pole lug according to another embodiment of the application.
  • connection shall be interpreted broadly, for example, they may be fixedly connected, detachably connected, or integrated. ; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components.
  • connection shall be interpreted broadly, for example, they may be fixedly connected, detachably connected, or integrated. ; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components.
  • the "on" or “under” of the first feature of the second feature may include direct contact between the first and second features, or may include the first and second features Not in direct contact but through other features between them.
  • the "above”, “above” and “above” of the first feature on the second feature include the first feature directly above and obliquely above the second feature, or it simply means that the first feature is higher in level than the second feature.
  • the “below”, “below” and “below” of the second feature of the first feature include the first feature directly below and obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.
  • the wound bean-type battery disclosed in the present application includes a bottom shell 1 and a cap 2, and a space for accommodating the wound battery core 3 is formed between the bottom shell 1 and the cap 2.
  • One lug 31 of the wound cell 3 is connected to the cap 2, and the other lug 31 is connected to the bottom shell 1.
  • the bottom shell 1 includes a bottom plate 11 and a ring arranged on the bottom plate 11
  • the cap 2 includes a top plate 21 and a second surrounding wall 22 ringed on one side of the top plate 21, the second surrounding wall 22 is sleeved on the first surrounding wall 12
  • the first surrounding wall 12 is provided with a plurality of continuous first arc-shaped portions 13 along its axis direction
  • the second surrounding wall 22 is provided with a plurality of continuous first arc-shaped portions 13 along its axis direction.
  • the second arc-shaped portion 23 is matched with the portion 13, and a sealing member 4 is sandwiched between the first surrounding wall 12 and the second surrounding wall 22.
  • the arrangement of the arc-shaped parts can press the sealing element 4 between the first surrounding wall 12 and the second surrounding wall 22, and
  • the convex arc part can be used to form a longer sealing reinforced area, which effectively raises the bottom.
  • the airtightness between the shell 1 and the cap 2, and the contact position between the arc-shaped part and the sealing element 4 is a circular arc surface, which can effectively prevent the sealing element 4 from contacting sharp parts, thereby preventing the sealing element 4 from sealing in the cap 2.
  • the wound cell 3 can be cylindrical, square cylindrical, elliptical, or the like.
  • the tabs are not limited to the two ends of the rewinding cell 3, and the same end of the rewinding cell 3 can also be used.
  • the first arc-shaped portion 13 is annularly arranged on the first surrounding wall 12, and correspondingly, the second arc-shaped portion 23 is also annularly arranged on the second wall.
  • the circular arc-shaped part can not only ensure a better sealing effect and effectively prevent liquid leakage, but also reduce the manufacturing difficulty and improve the production efficiency.
  • the arc-shaped part of this structure runs along the first surrounding wall 12 Or the second surrounding wall 22 has no interval in one circle, which further enhances the sealing effect.
  • each arc-shaped part can also be provided as an annularly spaced structure.
  • the first arc-shaped part 13 includes a structure along the first surrounding wall. There are a plurality of sub-arc portions arranged at intervals in the circumferential direction of 12, and the positions of the sub-arc portions of the two adjacent first arc-shaped portions 13 are in one-to-one correspondence.
  • the second arc-shaped portion 23 also includes an edge
  • the second surrounding wall 22 has a plurality of sub-arc portions arranged at intervals in the circumferential direction, and the positions of the sub-arc portions of the two adjacent second arc-shaped portions 23 are in one-to-one correspondence, so that the first arc-shaped portion 13 and the second arc-shaped portion 13
  • the position of the arc-shaped portion 23 can correspond to the bonding.
  • each first arc-shaped part 13 is arranged symmetrically along the central axis of the wound cell 3, and the positions of the sub-arc parts of the two adjacent first arc-shaped parts 13 correspond one-to-one .
  • One-to-one correspondence means that when viewed from above, the sub-arc portion in the uppermost first arc-shaped portion 13 completely shields the remaining sub-arc portions of the first arc-shaped portion 13.
  • a plurality of the first arc-shaped portions 13 may be spirally wound on the first surrounding wall 12 along the axial direction of the first surrounding wall 12, and correspondingly, the plurality of second arc-shaped portions 23 may be wound along the The axis direction of the second surrounding wall 22 is spirally wound on the second surrounding wall 22.
  • the spirally wound structure allows the cap 2 to be screwed on the bottom shell 1, which not only makes the sealing stronger, but also can be installed in a spiral manner to reduce the wear on the sealing element 4, and effectively extend the service life of the sealing element 4.
  • the first arc-shaped portion 13 is formed by stamping or rolling of the first surrounding wall 12
  • the second arc-shaped portion 23 is formed by stamping or rolling of the second surrounding wall 22.
  • Stamping or roll forming the arc-shaped part can not only reduce the manufacturing difficulty, but also form a corresponding groove on the protruding back side of the arc-shaped part, and use this groove to accommodate the arc-shaped part that is attached to it to achieve a tight fit.
  • all the first arc-shaped portions 13 are protruding toward the center of the first surrounding wall 12, and all the second The arc-shaped portions 23 all protrude toward the center of the second surrounding wall 22.
  • the protrusions of the two adjacent first arc-shaped portions 13 on the first surrounding wall 12 are opposite, and a plurality of The first arc-shaped portion 13 forms a first wave-shaped structure on the first surrounding wall 12, and a plurality of the second arc-shaped portions 23 on the second surrounding wall 22 form a first wave-shaped structure.
  • the second wave-shaped structure matched with the structure. The wave-shaped structure can make the first surrounding wall 12 and the second surrounding wall 22 fit more closely, and the sealing performance is better.
  • the hardness of the first surrounding wall 12 is set to be greater than the hardness of the second surrounding wall 22, and the hardness of the first surrounding wall 12 is relatively large.
  • the variable is much smaller than the deformation of the second surrounding wall 22, which ensures that the appearance and sealing of the wound bean battery will not fail.
  • the second surrounding wall 22 is formed with a necked portion at one end away from the top plate 21, and the end of the necked portion abuts against the outer wall of the first surrounding wall 12.
  • the arrangement of the necking part can effectively prevent the cover 2 from being separated from the bottom shell 1 and can further improve the sealing performance between the bottom shell 1 and the cover 2.
  • the end of the necking part is not limited to abut on the outer wall of the first surrounding wall 12, and the second surrounding wall 22 of the cap 2 can also be set to be long enough so that the cap 2 can extend to the bottom plate after being assembled on the bottom shell 1.
  • 11 is away from a side surface of the first surrounding wall 12, and then the necking part of the second surrounding wall 22 is necked, and the necking part abuts against the outer wall of the bottom plate 11 at this time.
  • the end of the second surrounding wall 22 may be directly pressed against the outer wall of the first surrounding wall 12 without forming a necking part, or as shown in FIG. 7, the end of the second surrounding wall 22 away from the top plate 21
  • the crimping process is performed to form a crimping structure 24, and the crimping structure 24 can also improve the tightness between the bottom shell 1 and the cap 2.
  • the sealing member 4 includes a sealing body 41 sandwiched between the first surrounding wall 12 and the second surrounding wall 22, and the sealing body 41 is close to A first extension 42 extends from one end of the top plate 21 toward the center of the sealing body 41, and a second extension 43 extends from one end of the first extension 42 away from the sealing body 41 toward the bottom plate 11, The second extension portion 43 is tightly attached to the inner wall of the first surrounding wall 12.
  • the sealing body 41 is sandwiched between the first surrounding wall 12 and the second surrounding wall 22. Since the two surrounding walls are provided with corresponding first arc-shaped parts 13 and second arc-shaped parts 23, the sealing body 41 is extruded to form a plurality of concave-convex structures. Due to the concave-convex structure on the sealing body 41, the sealing area can be increased, thereby improving the sealing effect. At the same time, the sealing body 41 of this structure has high air tightness and can effectively prevent leakage. The occurrence of liquid phenomenon.
  • the sealing member 4 can also be provided with a third arc part matching the first arc part 13 and the second arc part 23 in advance.
  • the sealing member 4 can be connected to the first arc part.
  • the surrounding wall 12 and the second surrounding wall 22 are more closely attached, and the sealing performance is better.
  • the third arc-shaped portion is provided on the sealing body 41.
  • first extension 42 and the second extension 43 can cooperate with the sealing body 41 to form a positioning structure for the sealing element 4.
  • the upper end of the first surrounding wall 12 is clamped on the second extension 43 and the sealing body. 41, and the first extension 42 abuts against the end surface of the upper end of the first surrounding wall 12 to realize the position positioning of the sealing member 4.
  • the length of the second extension part 43 in the vertical direction is smaller than the width of the single first arc-shaped part 13 or the second arc-shaped part 23 in the vertical direction, so that the size of the second extension part 43 in the first surrounding wall 12 is relatively small. Short, this can reduce material consumption, thereby reducing manufacturing costs, while also ensuring the basic positioning effect.
  • both the bottom shell 1 and the cap 2 are made of metal materials.
  • the bottom shell 1 and the cap 2 made of metal materials have high hardness, which makes the whole shell of the wound bean battery a hard shell.
  • the hard shell structure can ensure that the appearance of the whole wound bean battery remains unchanged and is effective. Prevent deformation of the casing caused by gas in the battery.
  • the metal material here can be a single metal material or an alloy material.
  • the metal material is stainless steel.
  • the pole piece 34 of the wound cell 3 is divided into a positive electrode piece 341 and a negative electrode piece 342, and the shape of the positive electrode piece 341 and the negative electrode piece 342 are similar.
  • Each pole piece 34 includes a current collector and an active material coated on the current collector, and the current collector has an extension that extends to the outside of the active material along the radial direction of the wound cell 3 32.
  • the extension portion 32 is partially overlapped after being bent, the extension portion 32 and the pole piece 34 are arranged at an angle, and the extension portion 32 forms the tab 31.
  • the tab 31 is directly formed after bending, eliminating the need for welding the tab 31, improving production efficiency, and reducing the winding cell 3 At the same time, the integrally formed tab 31 and tab 34 have higher strength and are not easy to detach.
  • the overlapping position 321 of the extension portion 32 is provided with a reinforcing member 33.
  • the reinforcing member 33 can strengthen the strength of the folded overlapping position 321, effectively preventing the extension portion 32 from being broken after bending, and protecting the integrity of the tab 31, At the same time, the overall strength of the tab 31 is strengthened.
  • the bending angle of the extension portion 32 can be flexibly adjusted according to the requirements of the winding cell 3 during packaging.
  • the extension portion 32 is bent with the position connected to the end of the pole piece 34 as the fulcrum, and the first included angle ⁇ is bent,
  • the first included angle ⁇ is 90°. This angle allows the extension 32 to be easily drawn from both ends of the wound cell 3, shortens the length of the tab 31, and reduces the manufacturing cost.
  • the bending angle of the extension portion 32 is not limited to 90°, and the first included angle ⁇ can also be set to 30°, 45°, 100°, 120°, etc. as required.
  • the reinforcing member 33 is wrapped with an adhesive tape outside the overlapping position 321 of the extension portion 32.
  • Setting the reinforcing member 33 as an adhesive tape can buffer the overlapping position 321 of the extension portion 32 after bending, which can reduce the stress of the extension portion 32 at the bending position to a certain extent, and effectively reduce the overlapping of the extension portion 32.
  • the break of the joint position 321 causes the tab 31 and the tab 34 to separate.
  • the structure of the overlapping position 321 of the extension part 32 is protected and shaped by tape to prevent the tab 31 from passing a long time.
  • the extension portion 32 deforms at the folded position 321 after bending, which affects the normal use of the wound cell 3.
  • multiple layers of adhesive tape may be wound at the overlapping position 321.
  • the reinforcing member 33 is a double-sided adhesive tape
  • the extension portion 32 is provided with a first-fitting first at the overlapping position 321.
  • a stacking surface and a second stacking surface, and the double-sided adhesive is arranged between the first stacking surface and the second stacking surface.
  • the arrangement of the double-sided tape can effectively prevent the separation of the first overlapping surface and the second overlapping surface, so as to prevent the tab 31 from occupying the space between the bottom shell 1 and the cap 2.
  • extension portion 32 can be bent at the same position multiple times to increase the thickness of the overlapping position 321, thereby increasing the strength of the pole piece 34.
  • a separator 35 is provided between the positive electrode sheet 341 and the negative electrode sheet 342 of the wound cell 3, and the separator 35 has an axis along the winding cell 3 The direction extends to the isolation portion 351 at both ends of the negative electrode sheet 342, and the isolation portion 351 is used to isolate the tab 31 of the wound cell 3 and the end surface of the wound cell 3.
  • the arrangement of the isolation portion 351 can effectively prevent the tab 31 from making electrical contact with the two ends of the wound cell 3 in the vertical direction, and there is no need to additionally provide insulating spacers on the end surface of the wound cell 3, which reduces the winding
  • the difficulty and cost of the preparation of the bean-type battery improves the production efficiency, and at the same time, there is no need to change the preparation process and equipment of the related battery, which is conducive to the large-scale production of the wound bean-type battery and has good insulation.
  • the length of the isolation portion 351 extending beyond the end surface of the wound cell 3 is not less than 0.75 mm. This design can ensure that the end surface of the wound cell 3 formed after the positive electrode sheet 341, the negative electrode sheet 342 and the separator 35 are wound has a sufficient length of the isolation portion 351 to isolate the tab 31 and ensure the insulation effect.
  • the current collector of the positive electrode tab 341 is aluminum foil and the current collector of the negative electrode tab 342 is copper foil
  • the material of the positive electrode tab 311 is aluminum foil
  • the material of the negative electrode tab 312 is copper foil.
  • aluminum foil and copper foil both are softer than the material of the related tabs, aluminum sheet (strip) or nickel sheet (strip), so that the isolation part 351 is not easily affected by the tabs when it is attached to the end face of the wound battery core 3. 31 punctured.
  • a separator with high temperature resistance (130-150° C.) and/or high mechanical strength, such as an aramid separator, can be used.
  • the diameter-to-height ratio of the winding bean battery is ⁇ 1; optional>1.
  • the aforementioned wound bean battery is a rechargeable bean battery.
  • an embodiment or the like means that a specific feature, structure, material, or characteristic of the embodiment is included in at least one embodiment or example of the application.
  • the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment.

Abstract

一种卷绕式豆式电池，包括底壳（1）和盖帽（2），底壳（1）与盖帽（2）之间形成容纳卷绕式电芯（3）的空间，卷绕式电芯（3）的正极耳（311）与盖帽（2）连接，负极耳（312）与底壳（1）连接，底壳（1）包括底板（11）和环设在底板（11）的一侧面的第一围壁（12），盖帽（2）包括顶板（21）和环设在顶板（21）一侧面的第二围壁（22），第二围壁（22）套设在第一围壁（12）外，第一围壁（12）上沿其轴线方向设置有多个连续的第一弧形部（13），第二围壁（22）上沿其轴线方向设置有多个与第一弧形部（13）配合的第二弧形部（23），第一围壁（12）与第二围壁（22）之间夹设有密封件（4）。

Description

卷绕式豆式电池
本公开要求在2019年12月13日提交中国专利局、申请号分别为201911284157.0和201922250372.0的中国专利申请的优先权，以上申请的全部内容通过引用结合在本公开中。
技术领域
本申请涉及电池技术领域，例如涉及一种卷绕式豆式电池。
背景技术
纽扣电池也称扣式电池，是指外形尺寸像一颗小纽扣的电池。纽扣电池一般包括底壳、盖帽和设置在二者构成的容纳腔内的电芯，由于纽扣电池的尺寸非常小，造成其密封难度非常大。纽扣电池的装配过程如下：将密封圈套设在底壳上，放置电芯等操作后，将盖帽盖设在底壳上进行密封处理。相关的纽扣电池虽然含有密封圈，但是其密封效果仍然一般，易导致电池漏液，影响纽扣电池的使用寿命，且在密封时，密封圈也容易发生破损，导致密封失效。
发明内容
本申请提供一种卷绕式豆式电池，其结构简单，密封效果好。
本申请提供一种卷绕式豆式电池，包括底壳和盖帽，所述底壳与所述盖帽之间形成容纳卷绕式电芯的空间，所述卷绕式电芯的一极耳与所述盖帽连接，另一极耳与所述底壳连接，所述底壳包括底板和环设在所述底板的一侧面的第一围壁，所述盖帽包括顶板和环设在所述顶板一侧面的第二围壁，所述第二围壁套设在所述第一围壁外，所述第一围壁上沿其轴线方向设置有多个连续的第一弧形部，所述第二围壁上沿其轴线方向设置有多个与所述第一弧形部配合的第二弧形部，所述第一围壁与所述第二围壁之间夹设有密封件。
所述第一弧形部环形设置在所述第一围壁上，多个所述第一弧形部沿所述第一围壁的轴线方向平行；或，
多个所述第一弧形部沿所述第一围壁的轴线方向螺旋盘绕在所述第一围壁上；或，
所述第一弧形部包括沿所述第一围壁的周向环形间隔设置的多个子弧形部。
所述第一弧形部由所述第一围壁冲压或辊压形成，所述第二弧形部由所述第二围壁冲压或者辊压形成。
所有的所述第一弧形部均朝向所述第一围壁的中心凸出设置，所有的所述第二弧形部均朝向所述第二围壁的中心凸出设置；或，
所有的所述第一弧形部均朝向背离所述第一围壁的中心凸出设置，所有的所述第二弧形部均朝向背离所述第二围壁的中心凸出设置；或，
所述第一围壁上的相邻两个所述第一弧形部的凸设方向相反，多个所述第一弧形部在所述第一围壁上形成第一波浪形结构，所述第二围壁上的多个所述第二弧形部形成与所述第一波浪形结构相配合的第二波浪形结构。
所述第一围壁的硬度大于所述第二围壁的硬度。
所述第二围壁远离所述顶板的一端形成有缩口部，所述缩口部的端部抵紧在所述第一围壁的外壁或所述底板的外壁；或，
所述第二围壁远离所述顶板的一端与所述第一围壁的外壁抵紧；或，
所述第二围壁远离所述顶板的一端设置有卷边结构，所述卷边结构与所述第一围壁的外壁抵紧。
所述密封件包括夹设在所述第一围壁与所述第二围壁之间的密封本体，所述密封本体靠近所述顶板的一端朝向所述密封本体的中心延伸有第一延伸部，所述第一延伸部远离所述密封本体的一端朝向所述底板延伸有第二延伸部，所述第二延伸部贴紧在所述第一围壁的内壁。
所述底壳和所述盖帽均采用金属材料制成。
所述卷绕式电芯的极片包括集流体和涂覆在所述集流体上的活性物质，所述集流体具有沿所述卷绕式电芯的径向方向延伸至所述活性物质外的延伸部，所述延伸部弯折后部分叠合，所述延伸部与所述极片呈夹角设置，所述延伸部弯折形成所述极耳。
所述卷绕式电芯包括正极片、负极片以及设置在所述正极片与所述负极片之间的隔膜，所述隔膜具有沿所述卷绕式电芯的轴线方向延伸至所述负极片的两端的隔离部，所述隔离部用于隔离所述卷绕式电芯的极耳与所述卷绕式电芯的端面。
本申请通过在第一围壁和第二围壁上设置有对应的弧形部，弧形部的设置可以将密封件压紧在第一围壁和第二围壁之间，显著提升了底壳和盖帽之间的密 封性，且弧形部的设置还可以对密封件进行保护，防止密封件在盖帽封边时发生破损，延长密封件的使用寿命，同时也保证底壳和盖帽之间的密封不失效。
附图说明
下面根据附图和实施例对本申请作进一步详细说明。
图1为本申请一实施例的卷绕式豆式电池的剖视示意图；
图2为图1的分解示意图；
图3为本申请另一实施例的卷绕式豆式电池的剖视示意图；
图4为图3的分解示意图；
图5为本申请又一实施例的卷绕式豆式电池的剖视示意图；
图6为图5的分解示意图；
图7为本申请再一实施例的卷绕式豆式电池的剖视示意图；
图8为本申请另一实施例的卷绕式豆式电池的剖视示意图；
图9为本申请一实施例的极片与极耳的结构示意图；
图10为本申请另一实施例的极片与极耳的结构示意图。
图中：
1、底壳；11、底板；12、第一围壁；13、第一弧形部；
2、盖帽；21、顶板；22、第二围壁；23、第二弧形部；24、卷边结构；
3、卷绕式电芯；31、极耳；311、正极耳；312、负极耳；32、延伸部；321、叠合位置；33、加强件；34、极片；341、正极片；342、负极片；35、隔膜；351、隔离部；
4、密封件；41、密封本体；42、第一延伸部；43、第二延伸部。
具体实施方式
为使本申请解决的技术问题、采用的技术方案和达到的技术效果更加清楚，下面将结合附图对本申请实施例的技术方案作进一步的详细描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
参照图1至图6所示，本申请公开的卷绕式豆式电池包括底壳1和盖帽2，所述底壳1与所述盖帽2之间形成容纳卷绕式电芯3的空间，所述卷绕式电芯3的一极耳31与所述盖帽2连接，另一极耳31与所述底壳1连接，所述底壳1包括底板11和环设在所述底板11的一侧面的第一围壁12，所述盖帽2包括顶板21和环设在所述顶板21一侧面的第二围壁22，所述第二围壁22套设在所述第一围壁12外，所述第一围壁12上沿其轴线方向设置有多个连续的第一弧形部13，所述第二围壁22上沿其轴线方向设置有多个与所述第一弧形部13配合的第二弧形部23，所述第一围壁12与所述第二围壁22之间夹设有密封件4。通过在第一围壁12和第二围壁22上设置有对应的弧形部，弧形部的设置可以将密封件4压紧在第一围壁12和第二围壁22之间，且可以在有限的空间内(豆式电池的尺寸较小，例如：直径为10mm-13mm，高为3mm-6mm)利用凸出设置的弧形部形成较长的密封加强区域，有效地提升了底壳1和盖帽2之间的密封性，且弧形部与密封件4的接触位置为圆弧面，可以有效地防止密封件4与尖锐的部位进行接触，进而防止密封件4在盖帽2封边时发生破损，延长密封件4的使用寿命，同时也保证底壳1和盖帽2之间的密封不失效。
卷绕式电芯3可以为圆柱形、方柱形、椭圆柱形等形状。
所述极耳也不限于再卷绕式电芯3的两端，也可以再卷绕式电芯3的同一端。
如图1和图2所示，在本实施例中，所述第一弧形部13环形设置在所述第一围壁12上，对应地，第二弧形部23也是环形设置在第二围壁22上，环形设置的弧形部不仅可以保证较好的密封效果，有效防止漏液，同时还可以降低制造难度，提升生产效率，另外，此结构的弧形部沿第一围壁12或第二围壁22一周无间隔，进一步增强密封效果。
在其他实施例中，不限于将弧形部设置为整体的环形结构，还可以将每个弧形部设置为环形间隔的结构，所述第一弧形部13包括沿所述第一围壁12的周向环形间隔设置的多个子弧形部，相邻两个所述第一弧形部13的所述子弧形部位置一一对应，对应地，第二弧形部23也包括沿第二围壁22的周向环形间隔设置的多个子弧形部，相邻两个第二弧形部23的子弧形部的位置一一对应，以使第一弧形部13和第二弧形部23的位置能够对应实现贴合。
每个第一弧形部13的子弧形部的沿卷绕式电芯3的中心轴线对称设置，相邻两个所述第一弧形部13的所述子弧形部位置一一对应。
一一对应设置的意思是：俯视角度下，最上面的第一弧形部13中的子弧形部将其余的第一弧形部13的子弧形部全部遮挡。另外，还可以将多个所述第一弧形部13沿所述第一围壁12的轴线方向螺旋盘绕在所述第一围壁12上，对应地，多个第二弧形部23沿第二围壁22的轴线方向螺旋盘绕在所述第二围壁22上。螺旋盘绕的结构可以使盖帽2旋接在底壳1上，不仅使密封性更强，还可以利用螺旋方式安装降低对密封件4的磨损，有效地延长密封件4的使用寿命。
在本实施例中，所述第一弧形部13由所述第一围壁12冲压或辊压形成，所述第二弧形部23由所述第二围壁22冲压或者辊压形成。冲压或者辊压成型弧形部，不仅可以降低制造难度，在弧形部凸设的背侧形成对应的凹槽，利用此凹槽容纳与其贴合的弧形部，实现紧密配合。
在本申请的一个具体的实施例中，如图1和2所示，所有的所述第一弧形部13均朝向所述第一围壁12的中心凸出设置，所有的所述第二弧形部23均朝向所述第二围壁22的中心凸出设置。
在本申请的另一个具体的实施例中，如图3和4所示，所有的所述第一弧 形部13均朝向背离所述第一围壁12的中心凸出设置，所有的所述第二弧形部23均朝向背离所述第二围壁22的中心凸出设置。
在本申请的又一个具体的实施例中，如图5和6所示，所述第一围壁12上的相邻两个所述第一弧形部13的凸设方向相反，多个所述第一弧形部13在所述第一围壁12上形成第一波浪形结构，所述第二围壁22上的多个所述第二弧形部23形成与所述第一波浪形结构相配合的第二波浪形结构。波浪形结构可以使第一围壁12和第二围壁22的贴合更加紧密，密封性更好。
为了保证卷绕式豆式电池在组装和封边时不发生变形，将所述第一围壁12的硬度设置为大于所述第二围壁22的硬度，第一围壁12的硬度较大，可以作为支撑基体，不论是在装配密封件4、盖帽2还是对盖帽2进行密封等步骤，都不会使第一围壁12(即底壳1)发生变形或第一围壁12的形变量远小于第二围壁22的形变量，保证卷绕式豆式电池的外观形态和密封不失效。
一实施例中，所述第二围壁22远离所述顶板21的一端形成有缩口部，所述缩口部的端部抵紧在所述第一围壁12的外壁。缩口部的设置可以有效防止盖帽2脱离底壳1，并可以进一步提升底壳1和盖帽2之间的密封性。
当然，缩口部的端部不限于抵接在第一围壁12的外壁，还可以将盖帽2的第二围壁22设置得足够长，使得盖帽2装配到底壳1上后可以延伸到底板11背离第一围壁12的一侧面，然后对第二围壁22的缩口部进行缩口，此时缩口部抵紧在底板11的外壁。
另外，还可以不形成缩口部，直接将第二围壁22的端部抵紧在第一围壁12的外壁，或者如图7所示，对第二围壁22远离顶板21的端部进行卷边处理，形成卷边结构24，卷边结构24也能提升底壳1和盖帽2之间的密封性。
一实施例中，如图1至6所示，所述密封件4包括夹设在所述第一围壁12与所述第二围壁22之间的密封本体41，所述密封本体41靠近所述顶板21的一端朝向所述密封本体41的中心延伸有第一延伸部42，所述第一延伸部42远离所述密封本体41的一端朝向所述底板11延伸有第二延伸部43，所述第二延伸部43贴紧在所述第一围壁12的内壁。密封本体41被夹设在第一围壁12和第二围壁22之间，由于这两个围壁上设置有相对应的第一弧形部13和第二弧形部23，使得密封本体41被挤压形成多个凹凸结构，由于密封本体41上存在有 凹凸结构，可以使密封的面积增大，进而提升密封效果，同时此结构的密封本体41的气密性高，可有效防止漏液现象的发生。
当然还可以在密封件4上预先设置有与第一弧形部13和第二弧形部23相配合的第三弧形部，通过设置第三弧形部，可以使密封件4与第一围壁12和第二围壁22贴合更加紧密，密封性较好。
在本实施例中，第三弧形部设置在密封本体41上。
另外，第一延伸部42和第二延伸部43可以配合密封本体41形成一个对密封件4的定位结构，在安装时，第一围壁12的上端卡设在第二延伸部43和密封本体41之间，而第一延伸部42则抵紧在第一围壁12的上端的端面，实现对密封件4的位置定位。
第二延伸部43的沿竖直方向的长度小于单个第一弧形部13或第二弧形部23沿竖直方向的宽度，使得第二延伸部43位于第一围壁12内的尺寸较短，这样可以降低材料的消耗，进而降低制造成本，同时也能保证基本的定位效果。
一实施例中，所述底壳1和所述盖帽2均采用金属材料制成。金属材料制成的底壳1和盖帽2的硬度高，使得卷绕式豆式电池的整个外壳为硬壳，硬壳结构可以保证整个卷绕式豆式电池的外观形态不变，还能有效防止因电池内胀气而引起的外壳变形的情况。
此处的金属材料可以为单一的金属材料，也可以为合金材料。
在本实施例中，金属材料为不锈钢。
一实施例中，如图1、图9和图10所示，所述卷绕式电芯3的极片34分为正极片341和负极片342，正极片341和负极片342的形状类似，每个极片34均包括集流体和涂覆在所述集流体上的活性物质，所述集流体具有沿所述卷绕式电芯3的径向方向延伸至所述活性物质外的延伸部32，所述延伸部32弯折后部分叠合，所述延伸部32与所述极片34呈夹角设置，所述延伸部32形成所述极耳31。通过将极片34的集流体的延伸部32延伸至活性物质的外部弯折后直接形成极耳31，省去了极耳31焊接的工序，提升了生产效率，降低了卷绕式电芯3的内阻，同时一体成型的极耳31和极片34强度更高，不易脱离。
所述延伸部32的叠合位置321设置有加强件33。通过在延伸部32的叠合 位置321设置额外的加强件33，加强件33可以加强折弯叠合位置321的强度，有效防止延伸部32折弯后被折断，保护极耳31的完整性，同时也加强了极耳31的整体强度。
延伸部32折弯的角度大小根据卷绕式电芯3在封装时的要求灵活调整，延伸部32以与极片34的端部连接的位置为支点弯折，弯折第一夹角α，其中第一夹角α为90°，此角度可以使延伸部32便于从卷绕式电芯3的两端引出，缩短极耳31的长度，降低了制造成本。当然，延伸部32的折弯角度不限于为90°，还可以根据需要将第一夹角α设置为30°、45°、100°或者120°等等。
如图9所示，在本申请的一个可选的实施例中，加强件33包裹在延伸部32的叠合位置321的外部的胶带。将加强件33设置为胶带，一方面可以对延伸部32在弯折后的叠合位置321进行缓冲，可在一定程度上减缓延伸部32在弯折处的应力，有效减少延伸部32在叠合位置321的断裂而导致极耳31与极片34分离的现象，另一方面，利用胶带对延伸部32的叠合位置321的结构起到保护及定型的作用，防止极耳31经过长时间的使用后，延伸部32在弯折后的叠合位置321发生变形而影响卷绕式电芯3的正常使用。为了进一步增强胶带对延伸部32的保护作用，可以在叠合位置321缠绕多层胶带。
如图10所示，在本申请的另一个可选的实施例中，所述加强件33为双面胶，所述延伸部32上并位于所述叠合位置321设置有相贴合的第一叠合面和第二叠合面，所述双面胶设置在所述第一叠合面和所述第二叠合面之间。双面胶的设置可以有效防止第一叠合面和第二叠合面分离，以避免极耳31占用底壳1和盖帽2之间的空间。
另外，延伸部32可以在同一位置弯折多次，增加叠合位置321的厚度，进而提升极片34的强度。
一实施例中，如图8所示，所述卷绕式电芯3的正极片341和负极片342之间设置有隔膜35，所述隔膜35具有沿所述卷绕式电芯3的轴线方向延伸至所述负极片342的两端的隔离部351，所述隔离部351用于隔离所述卷绕式电芯3的极耳31与所述卷绕式电芯3的端面。隔离部351的设置可以有效防止极耳31与卷绕式电芯3的竖直方向的两端发生电接触，无需额外在卷绕式电芯3的端面上设置绝缘垫片，降低了卷绕式豆式电池的制备难度和成本，提升了生产效 率，同时无需改变相关电池的制备工艺和设备，有利于卷绕式豆式电池的大规模生产，且绝缘性良好。
在本实施例中，隔离部351延伸出卷绕式电芯3的端面的长度不小于0.75mm。此设计可以保证正极片341、负极片342和隔膜35卷绕后形成的卷绕式电芯3的端面有足够长度的隔离部351，以对极耳31进行绝缘隔离，保证绝缘效果。
另外，一般地，由于正极片341的集流体为铝箔，而负极片342的集流体为铜箔，因此正极耳311的材质为铝箔，负极耳312的材质为铜箔。对于铝箔和铜箔，二者均比相关的极耳的材质铝片(带)或镍片(带)软，使得隔离部351在贴合到卷绕式电芯3的端面时不易被极耳31刺破。
为了进一步提高卷绕式豆式电池的安全性，可以使用具有耐高温(130-150℃)特性和/或具有高机械强度的隔膜，例如：芳纶隔膜。
上述卷绕式豆式电池的直径高度比≥1；可选＞1。
上述卷绕式豆式电池为可充电豆式电池。
于本文的描述中，需要理解的是，术语“上”等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
在本说明书的描述中，参考术语“一实施例”等的描述意指结合该实施例的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例。
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以适当组合，形成本领域技术人员可以理解的其他实施方式。

Claims (10)

  1. 一种卷绕式豆式电池，包括：底壳和盖帽，所述底壳与所述盖帽之间形成容纳卷绕式电芯的空间，所述卷绕式电芯的一极耳与所述盖帽连接，另一极耳与所述底壳连接，其中，所述底壳包括底板和环设在所述底板的一侧面的第一围壁，所述盖帽包括顶板和环设在所述顶板一侧面的第二围壁，所述第二围壁套设在所述第一围壁外，所述第一围壁上沿其轴线方向设置有多个连续的第一弧形部，所述第二围壁上沿其轴线方向设置有多个与所述第一弧形部配合的第二弧形部，所述第一围壁与所述第二围壁之间夹设有密封件。
  2. 根据权利要求1所述的卷绕式豆式电池，其中，所述第一弧形部环形设置在所述第一围壁上，多个所述第一弧形部沿所述第一围壁的轴线方向平行；或，
    多个所述第一弧形部沿所述第一围壁的轴线方向螺旋盘绕在所述第一围壁上；或，
    所述第一弧形部包括沿所述第一围壁的周向环形间隔设置的多个子弧形部。
  3. 根据权利要求1所述的卷绕式豆式电池，其中，所述第一弧形部由所述第一围壁冲压或辊压形成，所述第二弧形部由所述第二围壁冲压或者辊压形成。
  4. 根据权利要求3所述的卷绕式豆式电池，其中，所有的所述第一弧形部均朝向所述第一围壁的中心凸出设置，所有的所述第二弧形部均朝向所述第二围壁的中心凸出设置；或，
    所有的所述第一弧形部均朝向背离所述第一围壁的中心凸出设置，所有的所述第二弧形部均朝向背离所述第二围壁的中心凸出设置；或，
    所述第一围壁上的相邻两个所述第一弧形部的凸设方向相反，多个所述第一弧形部在所述第一围壁上形成第一波浪形结构，所述第二围壁上的多个所述第二弧形部形成与所述第一波浪形结构相配合的第二波浪形结构。
  5. 根据权利要求1所述的卷绕式豆式电池，其中，所述第一围壁的硬度大于所述第二围壁的硬度。
  6. 根据权利要求1所述的卷绕式豆式电池，其中，所述第二围壁远离所述顶板的一端形成有缩口部，所述缩口部的端部抵紧在所述第一围壁的外壁或所述底板的外壁；或，
    所述第二围壁远离所述顶板的一端与所述第一围壁的外壁抵紧；或，
    所述第二围壁远离所述顶板的一端设置有卷边结构，所述卷边结构与所述第一围壁的外壁抵紧。
  7. 根据权利要求1所述的卷绕式豆式电池，其中，所述密封件包括夹设在所述第一围壁与所述第二围壁之间的密封本体，所述密封本体靠近所述顶板的一端朝向所述密封本体的中心延伸有第一延伸部，所述第一延伸部远离所述密封本体的一端朝向所述底板延伸有第二延伸部，所述第二延伸部贴紧在所述第一围壁的内壁。
  8. 根据权利要求1至7任一项所述的卷绕式豆式电池，其中，所述底壳和所述盖帽均采用金属材料制成。
  9. 根据权利要求1至7任一项所述的卷绕式豆式电池，其中，所述卷绕式电芯的极片包括集流体和涂覆在所述集流体上的活性物质，所述集流体具有沿所述卷绕式电芯的径向方向延伸至所述活性物质外的延伸部，所述延伸部弯折后部分叠合，所述延伸部与所述极片呈夹角设置，所述延伸部形成所述极耳。
  10. 根据权利要求1至7任一项所述的卷绕式豆式电池，其中，所述卷绕式电芯包括正极片、负极片以及设置在所述正极片与所述负极片之间的隔膜，所述隔膜具有沿所述卷绕式电芯的轴线方向延伸至所述负极片的两端的隔离部，所述隔离部用于隔离所述卷绕式电芯的极耳与所述卷绕式电芯的端面。
PCT/CN2019/126222 2019-12-13 2019-12-18 卷绕式豆式电池 WO2021114328A1 (zh)

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