WO2022152170A1 - 用于电芯的下塑件、电芯及电池模组 - Google Patents

用于电芯的下塑件、电芯及电池模组 Download PDF

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Publication number
WO2022152170A1
WO2022152170A1 PCT/CN2022/071633 CN2022071633W WO2022152170A1 WO 2022152170 A1 WO2022152170 A1 WO 2022152170A1 CN 2022071633 W CN2022071633 W CN 2022071633W WO 2022152170 A1 WO2022152170 A1 WO 2022152170A1
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Prior art keywords
lower plastic
plastic part
battery cell
raised
present disclosure
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PCT/CN2022/071633
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English (en)
French (fr)
Inventor
李志道
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蜂巢能源科技股份有限公司
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Application filed by 蜂巢能源科技股份有限公司 filed Critical 蜂巢能源科技股份有限公司
Priority to EP22739048.1A priority Critical patent/EP4280352A1/en
Publication of WO2022152170A1 publication Critical patent/WO2022152170A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to the field of batteries, and in particular, to a lower plastic part for a battery cell, a battery core and a battery module.
  • the lower plastic part in the structure of the lower plastic part in the battery cell, the lower plastic part is provided with an escape groove for accommodating the explosion-proof valve, which reduces the structural strength of the lower plastic part.
  • the present disclosure aims to solve at least one of the technical problems existing in the prior art.
  • one purpose of the present disclosure is to propose a lower plastic part for a battery cell.
  • the lower plastic part is provided with a raised portion for restricting the movement of the pole group, and is provided with an escape groove for avoiding the explosion-proof valve. Being arranged opposite to the protruding part improves the structural strength and reliability of the lower plastic part, and can be used to limit the movement of the pole group at the same time.
  • the lower plastic part for a battery cell includes: a lower plastic part body, the lower plastic part body has an inner side surface of the lower plastic part facing the pole group and an outer side surface of the lower plastic part away from the pole group; an escape groove , the avoidance groove is arranged on the outer side of the lower plastic part to avoid the explosion-proof valve of the battery core; the raised part, the raised part is multiple and arranged on the inner side of the lower plastic part, at least one The protruding portion is directly opposite to the escape groove.
  • the body of the lower plastic part is provided with an escape groove and a plurality of raised parts, and one of the raised parts is disposed opposite to the escape groove.
  • the raised part can strengthen the structural strength of the lower plastic part body, avoid the problem of strength reduction caused by the setting of the avoidance groove, and improve the reliability and structural strength of the lower plastic part, and the multiple raised parts can It is used to compress the pole group and avoid the movement of the pole group, which is suitable for improving the reliability of the battery cell.
  • FIG. 1 is a schematic diagram of an outer side structure of a lower plastic part according to an embodiment of the present disclosure
  • FIG. 2 is a schematic view of the inner side structure of a lower plastic part according to an embodiment of the present disclosure
  • Fig. 3 is the structural representation of circled A in Fig. 2;
  • FIG. 4 is a schematic structural diagram of an end cap assembly according to an embodiment of the present disclosure.
  • FIG. 5 is a bottom view of an end cap assembly according to an embodiment of the present disclosure.
  • End cap assembly 2 cover body 21.
  • the lower plastic part 1 for a battery cell will be described below with reference to FIGS. 1-5 .
  • the lower plastic part 1 for a battery cell includes a lower plastic part body 11 , an escape groove 12 and a convex part, and the lower plastic part body 11 has a lower plastic part facing the pole group
  • the avoidance groove 12 is arranged on the outer side of the lower plastic part to avoid the explosion-proof valve of the battery cell. At least part of the explosion-proof valve can be accommodated in the avoidance groove 12, and there are multiple protruding parts.
  • the plastic part 1 moves relatively.
  • the avoidance groove 12 is a solid structure provided on the inner side of the lower plastic part body 11 , and the avoidance groove 12 can be configured as a boxed structure recessed toward the inside.
  • the boxed structure has The avoidance groove peripheral wall 121 and the avoidance groove bottom wall 122 are provided with through holes on the inner surface of the lower plastic part body 11 , and the avoidance groove peripheral wall 121 can be provided on the inner circumference of the through hole, and the avoidance groove peripheral wall 121 extends toward the inside to avoid the bottom of the groove
  • the wall 122 is arranged at the inner end of the peripheral wall 121 of the avoidance groove.
  • the peripheral wall 121 of the avoidance groove and the bottom wall 122 of the avoidance groove define the accommodating space for the explosion-proof valve. within 12.
  • the raised portion can be used to strengthen the structural strength of the lower plastic part body 11. Since the lower plastic part 1 is provided with the structure of the avoidance groove 12, the lower plastic part 1 is provided with the structure of the avoiding groove 12. The overall structural strength of 1 is reduced, especially in the position where the avoidance groove 12 is provided, and the raised part is arranged opposite the avoidance groove 12, so that the raised part can make up for the lower plastic part body caused by the installation of the avoidance groove 12. 11 has the problem of reduced structural strength.
  • the body 11 of the lower plastic part is provided with an escape groove 12 and a plurality of raised parts, one of the raised parts is disposed opposite to the escape groove 12,
  • the protruding part is arranged opposite to the avoidance groove 12, so that the raised part can strengthen the structural strength of the lower plastic part body 11, avoid the problem of strength reduction caused by the setting of the avoidance groove 12, and improve the reliability and structural strength of the lower plastic part 1 , and the plurality of protrusions can be used to compress the pole group to avoid the movement of the pole group, which is suitable for improving the reliability of the battery cell.
  • the protruding portion includes a middle protruding portion 131 and side protruding portions 132 located on both sides of the middle protruding portion 131 , and the middle protruding portion 131 is directly opposite to the escape groove 12 .
  • the middle raised portion 131 can be arranged in the middle of the lower plastic part body 11, and the avoidance groove 12 is generally arranged in the middle of the lower plastic part body 11 so as to face the explosion-proof valve on the cell cover, and
  • the side protrusions 132 may be disposed on one side or both sides of the middle protrusion 131 , and the middle protrusion 131 may be used to strengthen the structural strength of the lower plastic body 11 at the side.
  • the middle convex portion 131 is formed on the bottom wall surface of the escape groove 12 and protrudes downward.
  • the escape groove 12 has an escape groove peripheral wall 121 and an escape groove bottom wall 122.
  • the inner surface of the lower plastic part body 11 is provided with an opening facing the explosion-proof valve.
  • the outer periphery of the opening is provided with a downwardly extending escape groove peripheral wall 121 to avoid
  • the lower end of the groove peripheral wall 121 is provided with an escape groove bottom wall 122, and at least part of the middle raised portion 131 is arranged on the escape groove bottom wall 122, the middle raised portion 131 is connected with the escape groove bottom wall 122, and the middle raised portion 131
  • the inner part of the groove 131 can be a cavity structure, and one end of the middle raised part 131 is open toward the bottom wall 122 of the escape groove, so that the escape groove 12 communicates with the interior of the middle raised part 131 and forms a cavity.
  • the surface of the middle convex portion 131 facing the lower side is provided with a plurality of first gas discharge holes 101 communicating with the escape groove 12 , and the first gas discharge holes 101 can lead out the gas inside the pole group to the lower side.
  • the plastic part 1 leads to the explosion-proof valve, and the first gas discharge hole 101 can guide the gas to the explosion-proof valve after the gas pressure in the electrode group increases, and the explosion-proof valve opens when the pressure reaches a preset value to avoid the pressure inside the electrode group. Too large to ensure the safety of the pole group.
  • the middle convex portion 131 is further provided with a plurality of second gas discharge holes 102 .
  • the plurality of first gas discharge holes 101 and the plurality of second gas discharge holes 102 are arranged along the middle convex portion 131 Length direction interval setting.
  • the middle protruding portion 131 is configured to protrude toward the inner side of the lower plastic part, and the middle protruding portion 131 is configured to be a boxed structure.
  • the groove bottom wall 122 is connected, the rest of the upper edges of the two first middle convex side walls 1311 are connected with the lower plastic part body 11, and a middle convex bottom is provided between the lower ends of the two first middle convex side walls 1311
  • the wall 1312; the side walls 1313 of the second middle convex portion are two and are located at both ends of the middle convex portion 131 in the extending direction, and each second middle convex portion sidewall 1313 is respectively connected to the two first middle convex portion sides
  • One end of the wall 1311 extending in the width direction is connected, and the lower end of each second middle convex portion side wall 1313 is connected with one end of the middle convex bottom wall 1312 extending in the width direction.
  • the lower surface of the middle raised portion 131 is the middle raised bottom wall 1312 .
  • a first gas discharge hole 101 and a second gas discharge hole 102 are arranged on the bottom wall 1312 of the middle convex portion.
  • the first gas discharge hole 101 is arranged opposite to the avoidance groove 12, and the second gas discharge hole 102 and the first gas discharge hole are arranged.
  • the holes 101 are arranged at intervals in the extending direction of the bottom wall 1312 of the middle convex portion.
  • a plurality of liquid leakage holes 103 are provided on the bottom wall of the side protrusion 132 , and the side protrusion includes a bottom wall 1321 of the side protrusion and the sidewalls 1322 of the side protrusions.
  • the sidewalls 1322 of the side protrusions are constructed in two and are arranged at intervals in the length direction of the lower plastic part 1. The upper ends of the sidewalls 1322 of the two side protrusions are connected to the lower plastic part body.
  • the lower ends of the side walls 1322 of the two side protrusions are provided with the bottom walls 1321 of the side protrusions, and the two ends of the side walls 1322 of the two side protrusions are also provided with end plates 1323 of the side protrusions
  • the side protrusion end plate connects the side protrusion side wall 1322 and the side protrusion bottom wall 1321 to form a boxed structure
  • a leakage hole 103 is provided on the side protrusion bottom wall 1321
  • the liquid leakage hole 103 is suitable for preventing electrolyte from being stored between the lower plastic part 1 and the cover plate during the process of injecting liquid into the battery cell, and the electrolyte liquid flows into the battery cell casing along with the liquid leakage hole 103 during liquid injection.
  • the lower plastic part body 11 is provided with a positive pole hole and a negative pole pole hole, and the positive pole pole hole and the negative pole pole hole are respectively disposed on both sides of the middle convex portion 131 .
  • an end cap assembly for a battery cell is also proposed.
  • the end cap assembly includes a cover plate body 21 and a lower plastic part 1 .
  • the lower plastic part 1 can be configured as the lower plastic part 1 of the above embodiment.
  • the length of the cover body 21 is L1 and the width is D1;
  • the lower plastic part 1 is arranged on the inner side of the cover body 21, the inner side is the side of the cover body 21 facing the pole group, and the length of the lower plastic part 1 is L2, the width is D2;
  • L2/L1 satisfies: 0.97 ⁇ L2/L1 ⁇ 0.98;
  • D2/D1 satisfies: 0.8 ⁇ D2/D1 ⁇ 0.99.
  • the surface of the lower plastic part 1 formed with the avoidance groove 12 is opposite to the inner side of the cover plate body 21 to space the cover plate body 21 from the end face of the pole group, so as to ensure the space between the cover plate body 21 and the pole group. , to prevent the cover body 21 from being electrified.
  • the end cover assembly for a battery cell of the present disclosure by setting the ratio range of the length and width of the cover plate body 21 and the length and width between the lower plastic part 1 , it can be ensured that the edge of the cover plate can be connected to the battery cell.
  • the shell is facing, and the lower plastic part 1 can be accommodated in the cell shell, and the cooperation with the cover plate body 21 is kept tight, which improves the cooperation reliability between the end cover assembly 2 and the cell shell.
  • L1 satisfies: 145mm ⁇ L1 ⁇ 147mm; L2 satisfies: 142mm ⁇ L2 ⁇ 144mm.
  • the lower surface of the lower plastic part 1 is provided with a plurality of raised parts, and the plurality of raised parts are in the width direction of the cover body 21 .
  • the plurality of raised portions include: a middle raised portion 131 and side raised portions 132 located on both sides of the middle raised portion 131, and the height of the middle raised portion 131 is smaller than the height of the side raised portion 131
  • the lower surface of the middle raised portion 131 and the lower surface of the side raised portion 132 are in the same horizontal plane.
  • the height of the middle raised portion 131 is H1
  • the height of the side raised portion 132 is H2
  • the H1/H2 satisfies: 0.8 ⁇ H1/H2 ⁇ 0.9.
  • the H1 satisfies: 3.5mm ⁇ H1 ⁇ 3.7mm; the H2 satisfies: 4.3mm ⁇ H2 ⁇ 4.7mm.
  • the cell according to the present disclosure is provided with the lower plastic part 1 according to any one of the above embodiments. Since the cell according to the present disclosure is provided with the lower plastic part 1 of the above-mentioned embodiment, the lower plastic part 1 of the above-mentioned embodiment is provided on the cell according to the present disclosure.
  • the structural strength of the part 1 is high, and the plurality of protrusions on the lower plastic part 1 can effectively fix the pole group, avoid the movement of the pole group, and improve the overall reliability of the cell.
  • the battery module according to the present disclosure is briefly described below.
  • the battery module according to the present disclosure is provided with the battery cells of the above embodiments. Since the battery module according to the present disclosure is provided with the battery cells of the above embodiments, the overall reliability and stability of the battery module are high.
  • first feature may include one or more of such features.
  • a first feature being "above” or “beneath” a second feature may include the first and second features in direct contact, or may include the first and second features not in direct contact but through them Additional feature contacts between.
  • a first feature "above”, “over” and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is level above Second feature.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本公开公开了一种用于电芯的下塑件（1）、电芯及电池模组，下塑件包括：下塑件本体（11）,所述下塑件本体（11）具有朝向极组的下塑件（1）内侧面和远离所述极组的下塑件（1）外侧面；避让槽（12）,所述避让槽（12）设置在所述下塑件（1）外侧面上以避让所述电芯的防爆阀；凸起部，所述凸起部为多个且设置在所述下塑件（1）内侧面，至少一个所述凸起部与所述避让槽（12）正对。

Description

用于电芯的下塑件、电芯及电池模组
本公开要求于2021年01月14日提交中国专利局、申请号为202110045980.7，申请名称为“用于电芯的下塑件、电芯及电池模组”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及电池领域，尤其是涉及一种用于电芯的下塑件、电芯及电池模组。
背景技术
相关技术中，电芯中下塑件结构中，由于在下塑件上设置了收容防爆阀的避让槽，导致下塑件的结构强度降低，同时电芯中的极组容易移动，可靠性差。
申请内容
本公开旨在至少解决现有技术中存在的技术问题之一。为此，本公开的一个目的在于提出一种用于电芯的下塑件，该下塑件上设置有用于限制极组移动的凸起部，同时设置有避让防爆阀的避让槽，避让槽与凸起部正对设置，提高了下塑件的结构强度，以及可靠性，同时可以用于限制极组的移动。
根据本公开的用于电芯的下塑件包括：下塑件本体，所述下塑件本体具有朝向极组的下塑件内侧面和远离所述极组的下塑件外侧面；避让槽，所述避让槽设置在所述下塑件外侧面上以避让所述电芯的防爆阀；凸起部，所述凸起部为多个且设置在所述下塑件内侧面，至少一个所述凸起部与所述避让槽正对。
根据本公开的用于电芯的下塑件，下塑件本体上设置有避让槽以及多个凸起部，凸起部中的一个与避让槽正对设置，通过将凸起部与避让槽正对设置，使凸起部可以加强下塑件本体的结构强度，避免由于设置避让槽而导致的强度降低的问题，提高了下塑件的可靠性以及结构强度，而多个凸起部可以用于压紧极组，避免极组移动，适于提高电芯的可靠性。
本公开的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本公开的实践了解到。
附图说明
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是根据本公开实施例的下塑件的外侧面结构示意图；
图2是根据本公开实施例的下塑件的内侧面结构示意图；
图3是图2中圈示A的结构示意图；
图4是根据本公开实施例的端盖总成的结构示意图；
图5是根据本公开实施例的端盖总成的仰视图。
附图标记：
下塑件1，
下塑件本体11，
避让槽12，
避让槽周壁121，避让槽底壁122，
中间凸起部131，第一中间凸部侧壁1311，中间凸起底壁1312，第二中间凸部侧壁1313，
侧边凸起部132，侧边凸起部底壁1321，侧边凸起部侧壁1322，侧边凸起部端板1323，
第一气体排出孔101，第二气体排出孔102，漏液孔103；
端盖总成2，盖板本体21。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
下面参考图1-图5描述根据本公开实施例的用于电芯的下塑件1。
如图1和图2所示，根据本公开的用于电芯的下塑件1包括下塑件本体11、避让槽12和凸起部，下塑件本体11具有朝向极组的下塑件内侧面和远离极组的下塑件外侧面，避让槽12设置在下塑件外侧面上以避让电芯的防爆阀，防爆阀的至少部分可以收容于避让槽12内，凸起部为多个且设置在下塑件1的内侧面，至少一个凸起部与避让槽12正对，多个凸起部可以用于压紧极组，凸起部可以与极组配合，从而避免极组与下塑件1产生相对移动。
这里需要说明的是，如图2和图3所示，避让槽12是设置在下塑件本体11内侧面的实体结构，避让槽12可以构造为朝向内侧凹陷的盒装结构，该盒装结构具有避让槽周壁121以及避让槽底壁122，下塑件本体11的内侧面上设置有通孔，而通孔的内周可以设置有避让槽周壁121，避让槽周壁121朝向内侧延伸，避让槽底壁122设置于避让槽周壁121的内端，避让槽周壁121与避让槽底壁122限定出防爆阀收容空间，防爆阀与该避让槽12 正对，防爆阀的至少部分可以收容于该避让槽12内。
进一步地，通过将凸起部与避让槽12正对设置，使得凸起部可以用于加强下塑件本体11的结构强度，由于下塑件1上设置了避让槽12结构，导致下塑件1的整体结构强度降低，特别是在设置有避让槽12的位置，而将凸起部与避让槽12正对设置，使得凸起部可以弥补由于设置有避让槽12而导致的下塑件本体11的结构强度降低的问题。
根据本公开的用于电芯的下塑件1，下塑件本体11上设置有避让槽12以及多个凸起部，凸起部中的一个与避让槽12正对设置，通过将凸起部与避让槽12正对设置，使凸起部可以加强下塑件本体11的结构强度，避免由于设置避让槽12而导致的强度降低的问题，提高了下塑件1的可靠性以及结构强度，而多个凸起部可以用于压紧极组，避免极组移动，适于提高电芯的可靠性。
根据本公开的一个实施例，凸起部包括：中间凸起部131以及位于中间凸起部131两侧的侧边凸起部132，中间凸起部131与避让槽12正对。这里需要说明的是，中间凸起部131可以设置于下塑件本体11的中部，避让槽12一般设置于下塑件本体11的中部位置以与电芯盖板上的防爆阀正对，而侧边凸起部132可以设置于中间凸起部131的一侧或两侧，中间凸起部131可以用于加强下塑件本体11在侧边位置的结构强度。
如图2和图3所示，根据本公开的一个实施例，中间凸起部131的至少部分形成在避让槽12的底壁面且向下凸出。避让槽12具有避让槽周壁121以及避让槽底壁122，下塑件本体11的内表面上设置有与防爆阀正对的开口，开口的外周沿设置有向下延伸的避让槽周壁121，避让槽周壁121的下端设置有避让槽底壁122，而中间凸起部131的至少部分设置在避让槽底壁122上，中间凸起部131与避让槽底壁122相连，且中间凸起部131的内部可以为空腔结构，中间凸起部131朝向避让槽底壁122的一端敞开，以使避让槽12与中间凸起部131的内部连通并形成空腔。
根据本公开的一个实施例，中间凸起部131朝向下侧的表面设置有与避让槽12连通的多个第一气体排出孔101，第一气体排出孔101可以将极组内部的气体导出下塑件1并导向防爆阀，第一气体排出孔101可以在极组内的气体压力增大后，将气体导向防爆阀，在压力达到预设值后防爆阀打开，以避免极组内部的压力过大，保证极组的安全性。
根据本公开的一个实施例，中间凸起部131上还设置有多个第二气体排出孔102，多个第一气体排出孔101和多个第二气体排出孔102沿中间凸起部131的长度方向间隔设置。
具体地，中间凸起部131构造为朝向下塑件的内侧凸出，并且中间凸起部131构造为盒装结构，中间凸起部131包括第一中间凸部侧壁1311、第二中间凸部侧壁1313和中间凸起底壁1312，第一中间凸部侧壁1311为两个且在下塑件的长度方向间隔设置，两个第一中间凸部侧壁1311上边缘的至少部分与避让槽底壁122连接，两个第一中间凸起部侧壁 1311上边缘的其余部分与下塑件本体11连接，两个第一中间凸部侧壁1311的下端之间设置有中间凸起底壁1312；第二中间凸起部侧壁1313为两个且位于中间凸起部131延伸方向上的两端，每个第二中间凸起部侧壁1313分别与两个第一中间凸部侧壁1311在宽度方向延伸的一端连接，每个第二中间凸起部侧壁1313的下端与中间凸起底壁1312在宽度方向延伸的一端连接。
这里需要说明的是，中间凸起部131中朝向下侧的表面为所述中间凸起底壁1312。
中间凸起部底壁1312上设置有第一气体排出孔101和第二气体排出孔102，第一气体排出孔101与避让槽12正对设置，而第二气体排出孔102与第一气体排出孔101在中间凸部底壁1312的延伸方向间隔设置。
如图1和图2所示，根据本公开的一个实施例，侧边凸起部132的底壁上设置有多个漏液孔103，侧边凸起部包括侧边凸起部底壁1321和侧边凸起部侧壁1322，侧边凸起部侧壁1322构造为两个且在下塑件1的长度方向间隔设置，两个侧边凸起部侧壁1322的上端与下塑件本体11相连，两个侧边凸起部侧壁1322的下端设置有侧边凸起部底壁1321，两个侧边凸起部侧壁1322的两端还设置有侧边凸起部端板1323，侧边凸起部端板将侧边凸起部侧壁1322以及侧边凸起部底壁1321连接以围成盒装结构，在侧边凸起部底壁1321上设置有漏液孔103，漏液孔103适于在对电芯进行注液的过程中，避免下塑件1与盖板之间存储电解液，在注液时电解液随着漏液孔103流入电芯壳体内。
根据本公开的一个实施例，下塑件本体11上设置有正极极柱孔和负极极柱孔，正极极柱孔和负极极柱孔分别设置在中间凸起部131的两侧。
下面描述根据本公开的另一个方面实施例。
根据本公开还提出一种用于电芯的端盖总成，端盖总成包括盖板本体21和下塑件1，下塑件1可以构造为上述实施例的下塑件1。其中，盖板本体21的长度为L1、宽度为D1；下塑件1设置于所述盖板本体21内侧，内侧为盖板本体21中朝向极组的一侧，下塑件1的长度为L2、宽度为D2；L2/L1满足：0.97≤L2/L1≤0.98；D2/D1满足：0.8≤D2/D1≤0.99。
下塑件1形成有避让槽12的表面与盖板本体21的内侧正对，以用于将盖板本体21与极组的端面间隔开，以保证盖板本体21与极组之间间隔开，避免盖板本体21带电。
根据本公开的用于电芯的端盖总成，通过设定盖板本体21的长度、宽度与下塑件1之间的长度和宽度的比例范围，可以保证盖板的边缘能够与电芯壳体正对，而下塑件1可以收容于电芯壳体内，并与盖板本体21之间的配合保持紧密，提高了端盖总成2与电芯壳体之间的配合可靠性。
根据本公开的一个实施例，L1满足：145mm≤L1≤147mm；L2满足：142mm≤L2≤144mm。
根据本公开的一个实施例，75mm≤D1≤82mm；D2满足：71mm≤D2≤81mm。进一步地， 在本公开的一个实施例中，下塑件1的下表面设置有凸起部，凸起部为多个，多个所述凸起部在所述盖板本体21的宽度方向上间隔设置，多个凸起部包括：中间凸起部131以及位于所述中间凸起部131两侧的侧边凸起部132，所述中间凸起部131的高度小于所述侧边凸起部132的高度，所述中间凸起部131的下表面与所述侧边凸起部132的下表面在同一水平面内。
根据本公开的一个实施例，中间凸起部131的高度为H1，侧边凸起部132的高度为H2，所述H1/H2满足：0.8≤H1/H2≤0.9。
根据本公开的一个实施例，所述H1满足：3.5mm≤H1≤3.7mm；所述H2满足：4.3mm≤H2≤4.7mm。
下面简单描述根据本公开的电芯。
根据本公开的电芯上设置有上述实施例中任意一项所述的下塑件1，由于根据本公开的电芯上设置有上述实施例的下塑件1，因此该电芯中下塑件1的结构强度高，下塑件1上的多个凸起部可以有效地固定极组，避免极组移动，提高电芯整体的可靠性。
下面简单描述根据本公开的电池模组。
根据本公开的电池模组上设置有上述实施例的电芯，由于根据本公开的电池模组上设置有上述实施例的电芯，因此该电池模组的整体可靠性高，稳定性好。
在本公开的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，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公开的限制。
在本公开的描述中，“第一特征”、“第二特征”可以包括一个或者更多个该特征。
在本公开的描述中，“多个”的含义是两个或两个以上。
在本公开的描述中，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。
在本公开的描述中，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。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开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或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本公开的实施例，本领域的普通技术人员可以理解：在不脱离本公开的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本公开的范围由权利要求及其等同物限定。

Claims (10)

  1. 一种用于电芯的下塑件，其特征在于，包括：
    下塑件本体，所述下塑件本体具有朝向极组的下塑件内侧面和远离所述极组的下塑件外侧面；
    避让槽，所述避让槽设置在所述下塑件外侧面上以避让所述电芯的防爆阀；
    凸起部，所述凸起部为多个且设置在所述下塑件内侧面，至少一个所述凸起部与所述避让槽正对。
  2. 根据权利要求1所述的用于电芯的下塑件，其特征在于，所述凸起部包括：中间凸起部以及位于所述中间凸起部两侧的侧边凸起部，所述中间凸起部与所述避让槽正对。
  3. 根据权利要求2所述的用于电芯的下塑件，其特征在于，所述中间凸起部的至少部分形成在所述避让槽的底壁面且向下凸出。
  4. 根据权利要求3所述的用于电芯的下塑件，其特征在于，所述中间凸起部朝向下侧的表面设置有与所述避让槽连通的多个第一气体排出孔。
  5. 根据权利要求4所述的用于电芯的下塑件，其特征在于，所述中间凸起部上还设置有多个第二气体排出孔。
  6. 根据权利要求5所述的用于电芯的下塑件，其特征在于，多个所述第一气体排出孔和多个所述第二气体排出孔沿所述中间凸起部的长度方向间隔设置。
  7. 根据权利要求2所述的用于电芯的下塑件，其特征在于，所述侧边凸起部的底壁上设置有多个漏液孔。
  8. 根据权利要求2所述的用于电芯的下塑件，其特征在于，所述下塑件本体上设置有正极极柱孔和负极极柱孔，所述正极极柱孔和所述负极极柱孔分别设置在所述中间凸起部的两侧。
  9. 一种电芯，其特征在于，包括权利要求1-8中任一项所述的下塑件。
  10. 一种电池模组，其特征在于，包括权利要求9所述的电芯。
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