WO2023240905A1 - 一种定向泄压的电芯及电池模组 - Google Patents

一种定向泄压的电芯及电池模组 Download PDF

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Publication number
WO2023240905A1
WO2023240905A1 PCT/CN2022/130038 CN2022130038W WO2023240905A1 WO 2023240905 A1 WO2023240905 A1 WO 2023240905A1 CN 2022130038 W CN2022130038 W CN 2022130038W WO 2023240905 A1 WO2023240905 A1 WO 2023240905A1
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WO
WIPO (PCT)
Prior art keywords
arc
battery core
directional pressure
pressure relief
cover plate
Prior art date
Application number
PCT/CN2022/130038
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English (en)
French (fr)
Inventor
李尚益
黄利明
陈敏
Original Assignee
湖北亿纬动力有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 湖北亿纬动力有限公司 filed Critical 湖北亿纬动力有限公司
Priority to US18/003,344 priority Critical patent/US20240304934A1/en
Priority to EP22822262.6A priority patent/EP4329072A1/en
Publication of WO2023240905A1 publication Critical patent/WO2023240905A1/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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • 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
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/342—Non-re-sealable arrangements
    • 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

  • This application relates to the field of battery technology, for example, to a directional pressure relief battery cell and a battery module.
  • the battery core In order to prevent the battery core from exploding when thermal runaway occurs, the battery core is usually equipped with an explosion-proof valve structure.
  • the explosion-proof valve structure can release the heat inside the battery core, thereby preventing the battery core from exploding and ensuring the safety of users.
  • the explosion-proof valve structure in the related art is usually a cross-shaped notch on the bottom of the battery core.
  • the pressure inside the battery core increases.
  • the cross-shaped notch The marks are broken open, thereby releasing the pressure inside the cell.
  • the cover plate sealing the bottom of the cell is prone to fall off. Due to the impact of the internal pressure of the cell, the cover plate may fly out in any direction after falling off. , it is easy to cause injury and has poor safety performance.
  • This application provides a cell and battery module with directional pressure relief.
  • the explosion-proof valve can be opened in a directional manner, and the connection part of the explosion-proof valve can prevent the explosion-proof valve from flying out, ensuring the safety of users and having good safety performance.
  • inventions of the present application provide a directional pressure relief battery core.
  • the directional pressure relief battery core includes:
  • the cover plate is fastened to the housing, an explosion-proof valve is provided on the cover plate, the explosion-proof valve includes an arc-shaped notch and a connecting part, the arc-shaped notch and the connecting part Connected end to end to form a circular structure, the circular structure divides the cover plate into a circular part and an annular part, both the circular part and the annular part are connected to the connecting part, and the explosion-proof valve When opened, the arc-shaped notch is broken, and the circular part is turned around the connecting part.
  • a stepped groove protrudes from one side of the circular portion toward the housing, the stepped groove is circular, and the stepped groove is coaxially arranged with the cover plate.
  • the circular portion protrudes toward one side of the housing with a plurality of arc-shaped grooves, and the plurality of arc-shaped grooves are arranged along the circumferential direction of the stepped groove. Two adjacent ones Reinforcing ribs are formed between the arc-shaped grooves.
  • a plurality of the arcuate grooves are evenly distributed along the circumferential direction of the stepped groove.
  • the bottom wall and the side wall of the reinforcing rib are arranged at an included angle, and the included angle ranges from 30° to 60°.
  • the width of the reinforcing rib is 3 mm to 5 mm.
  • positioning ribs are provided on the arc-shaped groove opposite to the connecting portion.
  • annular rib protrudes from a side of the annular portion away from the housing, and the annular rib is coaxially arranged with the cover plate.
  • the length of the connecting portion is less than the length of the arc-shaped notch, and the length of the connecting portion is 5 mm to 10 mm.
  • embodiments of the present application provide a battery module, including the above-mentioned directional pressure relief battery cells.
  • the plurality of directional pressure relief battery cells are provided, and the connecting portions of the plurality of directional pressure relief battery cells are Set on the same side of the cell.
  • the directional pressure relief battery core includes a casing and a cover plate.
  • the cover plate is fastened to the casing.
  • An explosion-proof valve is provided on the cover plate.
  • the explosion-proof valve includes an arc-shaped notch. and the connecting part.
  • the arc-shaped notch and the connecting part are connected end to end to form a circular structure.
  • the circular structure separates the cover plate into a circular part and an annular part.
  • the present application also provides a battery module, including the above-mentioned directional pressure relief battery core.
  • a battery module including the above-mentioned directional pressure relief battery core.
  • Figure 1 is a schematic structural diagram of a directional pressure relief battery core provided in an embodiment of the present application
  • Figure 2 is a schematic structural diagram of the explosion-proof valve of the cover plate provided in the embodiment of the present application when it is not opened;
  • Figure 3 is a schematic structural diagram of the explosion-proof valve of the cover plate provided in the embodiment of the present application when it is opened.
  • Shell 100. Shell; 200. Cover plate; 201. Arc-shaped score; 202. Connection part; 210. Step groove; 220. Arc-shaped groove; 2201. Reinforcement rib; 2202. Positioning rib; 230. Annular convex rib.
  • connection should be understood in a broad sense.
  • it can be a fixed connection, a detachable connection, or an integral body.
  • It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements.
  • the specific meanings of the above terms in this application can be understood on a case-by-case basis.
  • the term “above” or “below” a first feature on a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them.
  • the terms “above”, “above” and “above” a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature.
  • “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • the directional pressure relief battery core includes a casing 100 and a cover 200.
  • the cover 200 is fastened to the casing 100.
  • An opening is provided at one end of the body 100, and the edge of the cover plate 200 is connected to the opening of the housing 100.
  • An explosion-proof valve is provided on the cover plate 200.
  • the explosion-proof valve includes an arc-shaped notch 201 and a connecting portion 202.
  • the arc-shaped notch 201 is connected to the opening of the housing 100.
  • the portions 202 are connected end to end to form a circular structure.
  • the circular structure divides the cover 200 into a circular portion and an annular portion. Both the circular portion and the annular portion are connected to the connecting portion 202.
  • the directional pressure relief battery core undergoes thermal runaway. , the pressure inside the housing 100 increases, and the explosion-proof valve is opened, thereby forming a circulation channel to release the internal pressure of the housing 100 . Since the wall thickness of the arc-shaped notch 201 is thin and the mechanical strength is smaller than that of the rest of the part, when the internal pressure of the housing 100 increases, the arc-shaped notch 201 will be opened first, and the circular part will wrap around the connecting part.
  • a stepped groove 210 is protruding from one side of the circular portion toward the inside of the housing 100 .
  • the stepped groove 210 is circular, and the stepped groove 210 is coaxially arranged with the cover plate 200 . Since people have higher requirements for the energy density of cells with directional pressure relief, the overall thickness of the cover plate 200 in the related art is generally small, resulting in a reduction in the pressure resistance of the cover plate 200.
  • the cover 200 may deform and protrude outward.
  • the cover 200 protrudes from the edge of the casing 100 there will be a height difference between the directional pressure relief cells, which may cause poor contact or short circuit.
  • the outward protrusion of the cover plate 200 can be alleviated.
  • the degree of deformation is small, it will not affect the normal use of the directional pressure relief battery core.
  • the stepped groove 210 is recessed toward one side of the housing 100, it can reduce the gas storage space inside the housing 100, shorten the valve opening time in a thermal runaway state, improve the sensitivity of the explosion-proof valve opening, and achieve a faster response speed. ,safer.
  • a plurality of arc-shaped grooves 220 are protruding from the circular portion toward one side of the housing 100 .
  • the plurality of arc-shaped grooves 220 are arranged along the circumferential direction of the stepped groove 210 .
  • Reinforcing ribs 2201 are formed, and the mechanical strength of the cover plate 200 can be improved through the arrangement of the reinforcing ribs 2201, thereby increasing the ability of the cover plate 200 to resist deformation.
  • the plurality of arc-shaped grooves 220 are evenly distributed along the circumferential direction of the stepped groove 210, and the plurality of arc-shaped grooves 220 have the same size and shape. Since the arcuate groove 220 is also recessed toward one side of the housing 100, the gas storage space inside the housing 100 can be reduced, the sensitivity of the explosion-proof valve to open is improved, and the safety performance is better.
  • the arcuate groove 220 can be formed by sheet metal.
  • the bottom wall and the side wall of the reinforcing rib 2201 are set at an included angle.
  • the value of the included angle ranges from 30° to 60°. °.
  • the angle between the bottom wall and the side wall of the reinforcing rib 2201 may be set to 30°, 40°, 50° or 60°, which will not be described again here.
  • the width of the reinforcing rib 2201 is set to 3 mm to 5 mm.
  • the width of the reinforcing rib 2201 can be set to 3mm, 3.5mm, 4mm, 4.5mm or 5mm. Of course, it can also be set to other values in the range of 3mm to 5mm, which is not limited in this embodiment.
  • the directional pressure relief cells need to be transported or transferred.
  • the casing 100 and the cover 200 of the directional pressure relief cells are both Being circular, it is difficult to determine the location of the connecting portion 202 on the cover 200. If installed randomly, the opening directions of the explosion-proof valves of multiple directional pressure relief cells will still be inconsistent, so a positioning structure is needed. Determine the installation location of the battery core for directional pressure relief.
  • four arc-shaped grooves 220 are used as an example for explanation.
  • the angle between the center lines of the four reinforcing ribs 2201 is 90°.
  • the connecting part 202 and the middle parts of the two arc-shaped grooves 220 are located on the same straight line, and positioning ribs 2202 are provided on the arc-shaped grooves 220 opposite to the connecting part 202.
  • a slot is provided corresponding to the position of the positioning rib 2202.
  • the positioning rib 2202 can be clamped in the slot, thereby determining the installation position of the directional pressure relief battery core and ensuring multiple The connection portions 202 on the cover plate 200 of the directional pressure relief battery core are on the same side, thereby ensuring that the explosion-proof valves of multiple directional pressure relief battery cores open in the same direction.
  • the cover 200 and the housing 100 can be fixed by rolling groove sealing.
  • the annular portion The compressive stress is greater than that of the circular portion. Therefore, in order to ensure that the cover plate 200 has sufficient sealing strength, continue to refer to Figures 2 and 3.
  • the annular portion of the cover plate 200 protrudes from the side away from the housing 100.
  • the annular convex rib 230 is coaxially arranged with the cover plate 200, thereby improving the ability of the cover plate 200 to resist compressive stress and ensuring good sealing performance.
  • the outer diameter of the cover 200 is 44mm, and the outer diameter of the housing 100 is 46mm.
  • the length of the connecting portion 202 is less than the length of the arc-shaped notch 201 .
  • the length of the connecting portion 202 is 5mm to 10mm.
  • the stepped groove 210 is The minimum diameter is 6 mm, the maximum diameter of the stepped groove 210 is 17 mm, the inner diameter of the annular rib 230 is 36 mm, and the outer diameter of the annular rib 230 is 42 mm.
  • the above structure can also be set to other sizes, which is not limited in this embodiment.
  • This embodiment also provides a battery module, including the above-mentioned directional pressure relief battery cells.
  • a battery module including the above-mentioned directional pressure relief battery cells.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

本申请属于电池技术领域，公开了一种定向泄压的电芯及电池模组，该定向泄压的电芯包括壳体和盖板，盖板扣合在壳体上，盖板上设有防爆阀，防爆阀包括弧形刻痕和连接部，弧形刻痕与连接部首尾相接围成圆形结构，圆形结构将盖板分隔为圆形部和环形部，热失控时，防爆阀被冲开，弧形刻痕处断裂，圆形部绕连接部翻转。

Description

一种定向泄压的电芯及电池模组
本申请要求在2022年6月15日提交中国专利局、申请号为202221498678.3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申请中。
技术领域
本申请涉及电池技术领域，例如涉及一种定向泄压的电芯及电池模组。
背景技术
为了避免电芯在发生热失控时出现爆炸，电芯通常设有防爆阀结构，通过防爆阀结构能够将电芯内部的热量释放出来，从而避免电芯发生爆炸，保证使用人员的生命安全。
一般来说，相关技术中的防爆阀结构通常为电芯底部的十字型刻痕，在电芯发生热失控时，电芯内部的压力增大，当压力增大至一定值时，十字型刻痕被冲开，从而释放电芯内部的压力。然而在十字型刻痕被冲破时，其开口的方向无法控制，且容易出现电芯底部封口的盖板脱落的情况，由于电芯内部压力的冲击，盖板脱落后可能会朝任意方向飞出，容易造成伤人的情况，安全性能较差。
发明内容
本申请提供一种定向泄压的电芯及电池模组，其防爆阀能够实现定向打开，且通过防爆阀的连接部能够防止防爆阀飞出，保证了使用人员的安全，安全性能良好。
第一方面，本申请实施例提供一种定向泄压的电芯，该定向泄压的电芯包括：
壳体；
盖板，所述盖板扣合在所述壳体上，所述盖板上设有防爆阀，所述防爆阀包括弧形刻痕和连接部，所述弧形刻痕与所述连接部首尾相接围成圆形结构，所述圆形结构将所述盖板分隔为圆形部和环形部，所述圆形部和所述环形部均与所述连接部连接，所述防爆阀打开时，所述弧形刻痕处断裂，所述圆形部绕所述连接部翻转。
在一实施例中，所述圆形部朝向所述壳体的一侧凸设有阶梯槽，所述阶梯 槽呈圆形，所述阶梯槽与所述盖板同轴设置。
在一实施例中，所述圆形部朝向所述壳体的一侧凸设有多个弧形槽，多个所述弧形槽沿所述阶梯槽的周向设置，相邻的两个所述弧形槽之间形成有加强筋。
在一实施例中，多个所述弧形槽沿所述阶梯槽的周向均匀分布。
在一实施例中，所述加强筋的底壁与侧壁之间呈夹角设置，所述夹角的取值范围为30°～60°。
在一实施例中，所述加强筋的宽度为3mm～5mm。
在一实施例中，与所述连接部相对的所述弧形槽上设置有定位筋。
在一实施例中，所述环形部远离所述壳体的一侧凸设有环形凸筋，所述环形凸筋与所述盖板同轴设置。
在一实施例中，所述连接部的长度小于所述弧形刻痕的长度，所述连接部的长度为5mm～10mm。
第二方面，本申请实施例提供一种电池模组，包括上述定向泄压的电芯，所述定向泄压的电芯设置为多个，多个所述定向泄压的电芯的连接部设置在电芯的同一侧。
本申请的有益效果为：
本申请提供一种定向泄压的电芯，该定向泄压的电芯包括壳体和盖板，盖板扣合在壳体上，盖板上设有防爆阀，防爆阀包括弧形刻痕和连接部，弧形刻痕与连接部首尾相接围成圆形结构，圆形结构将盖板分隔为圆形部和环形部，热失控时，防爆阀被冲开，弧形刻痕处断裂，圆形部绕连接部翻转，从而防爆阀能够沿确定的方向打开，以释放壳体内部的压力，并且由于连接部的设置，防爆阀在打开后不会飞出，安全性能较高。
本申请还提供一种电池模组，包括上述定向泄压的电芯，定向泄压的电芯设置为多个，多个定向泄压的电芯的连接部设置在同一侧，从而在发生热失控时，多个定向泄压的电芯的防爆阀能够朝着同一方向打开。
附图说明
图1是本申请实施例中提供的定向泄压的电芯的结构示意图；
图2是本申请实施例中提供的盖板的防爆阀未打开时的结构示意图；
图3是本申请实施例中提供的盖板的防爆阀打开时的结构示意图。
图中：
100、壳体；200、盖板；201、弧形刻痕；202、连接部；210、阶梯槽；220、 弧形槽；2201、加强筋；2202、定位筋；230、环形凸筋。
具体实施方式
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。
在本实施例的描述中，术语“上”、“下”、“左”、“右”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。此外，术语“第一”、“第二”仅仅用于在描述上加以区分，并没有特殊的含义。
如图1～图3所示，本实施例提供一种定向泄压的电芯，该定向泄压的电芯包括壳体100和盖板200，盖板200扣合在壳体100上，壳体100的一端设置有开口，盖板200的边缘与壳体100的开口连接，盖板200上设有防爆阀，防爆阀包括弧形刻痕201和连接部202，弧形刻痕201与连接部202首尾相接围成圆形结构，圆形结构将盖板200分隔为圆形部和环形部，圆形部和环形部均与连接部202连接，当定向泄压的电芯发生热失控时，壳体100内部的压力增大，防爆阀被冲开，从而形成流通的通道，以实现壳体100内部压力的释放。由于弧形刻痕201处的壁厚较薄，机械强度相对其余部分较小，因此在壳体100内部压力增大时，弧形刻痕201处将首先被冲开，圆形部绕连接部202向外进行翻转，从而实现了防爆阀的定向打开，并且由于弧形刻痕201的两个端部并未直接连接，而是通过连接部202连接，因此在圆形部绕连接部202翻转后不会飞出，保证了使用人员的安全。
示例性地，圆形部朝向壳体100内部的一侧凸设有阶梯槽210，阶梯槽210呈圆形，阶梯槽210与盖板200同轴设置。由于人们对定向泄压的电芯能量密度要求较高，因此相关技术中的盖板200的整体厚度一般较小，导致盖板200 抗压能力降低，在壳体100内部的压力增大时，盖板200可能会发生变形向外凸出的现象，当盖板200凸出于壳体100的边缘时，定向泄压的电芯之间的高度存在差异，可能会引起接触不良或短路的情况，通过阶梯槽210的设置，能够缓解盖板200向外凸出的情况，变形程度较小时，不会影响定向泄压的电芯的正常使用。此外，由于阶梯槽210朝向壳体100内部的一侧凹陷，能够减小壳体100内部的存气空间，缩短热失控状态下的开阀时间，提高防爆阀开阀的灵敏度，响应速度更快，更加安全。
示例性地，圆形部朝向壳体100的一侧凸设有多个弧形槽220，多个弧形槽220沿阶梯槽210的周向设置，相邻的两个弧形槽220之间形成有加强筋2201，通过加强筋2201的设置能够提高盖板200的机械强度，增加了盖板200抵抗变形的能力。示例性地，多个弧形槽220沿阶梯槽210的周向均匀分布，且多个弧形槽220的大小和形状相同。由于弧形槽220同样是朝向壳体100内部的一侧凹陷，能够减小壳体100内部的存气空间，提高防爆阀开阀的灵敏度，安全性能更好。
弧形槽220可以通过钣金成型，为了使弧形槽220在加工时容易脱模，加强筋2201的底壁与侧壁之间呈夹角设置，夹角的取值范围为30°～60°。示例性地，在一些实施例中，加强筋2201的底壁与侧壁之间的夹角可以设置为30°、40°、50°或60°，此处不再一一赘述。加强筋2201的宽度设置为3mm～5mm。示例性地，加强筋2201的宽度可以设置为3mm、3.5mm、4mm、4.5mm或5mm，当然也可以设置为在3mm～5mm范围内的其他数值，本实施例对此不做限定。
一般来说，在定向泄压的电芯成组的过程中需要对定向泄压的电芯进行搬运或转移，在此过程中，由于定向泄压的电芯的壳体100和盖板200均为圆形，不好确定盖板200上连接部202所在的位置，如果随意安装，还是会出现多个定向泄压的电芯的防爆阀的打开方向不统一的情况，因此需要一个定位结构来确定定向泄压的电芯的安装位置。
本实施例中以四个弧形槽220为例进行说明，相应的弧形槽220之间形成的加强筋2201也为四个，四个加强筋2201的中心线之间的夹角为90°，连接部202与其中两个弧形槽220的中部位于同一条直线上，与连接部202相对的弧形槽220上设置有定位筋2202。在搬运定向泄压的电芯的转运装置上，对应定位筋2202的位置设置有卡槽，定位筋2202能够卡设在卡槽内，从而确定定向泄压的电芯的安装位置，保证多个定向泄压的电芯的盖板200上的连接部202处在同一侧，从而保证多个定向泄压的电芯的防爆阀的打开方向相同。
在一些实施例中，可以通过滚槽封口的形式固定盖板200和壳体100，在此种情况下，受到封口方式的影响，圆形的盖板200结构在受到内部的压力时，环形部受到的压应力大于圆形部所受到的压应力，因此为了保证盖板200具有足够的密封强度，继续参见图2和图3，盖板200的环形部远离壳体100的一 侧凸设有环形凸筋230，环形凸筋230与盖板200同轴设置，从而提高盖板200抵抗压应力的能力，保证密封性能良好。
本实施例中盖板200的外径为44mm，壳体100的外径为46mm，连接部202的长度小于弧形刻痕201的长度，连接部202的长度为5mm～10mm，阶梯槽210的最小处直径为6mm，阶梯槽210的最大处直径为17mm，环形凸筋230的内径为36mm，环形凸筋230的外径为42mm。当然，在其他实施例中，上述结构也可以设置为其他尺寸，本实施例对此不做限定。
本实施例还提供一种电池模组，包括上述定向泄压的电芯，电池模组内的定向泄压的电芯设置为多个，多个定向泄压的电芯的连接部202设置在电芯的同一侧，从而在发生热失控时，多个定向泄压的电芯的防爆阀能够朝着同一方向打开，以释放壳体100内部的压力，并且由于连接部202的设置，防爆阀在打开后不会飞出，安全性能较高。

Claims (10)

  1. 一种定向泄压的电芯，包括：
    壳体(100)；
    盖板(200)，所述盖板(200)扣合在所述壳体(100)上，所述盖板(200)上设有防爆阀，所述防爆阀包括弧形刻痕(201)和连接部(202)，所述弧形刻痕(201)与所述连接部(202)首尾相接围成圆形结构，所述圆形结构将所述盖板(200)分隔为圆形部和环形部，所述圆形部和所述环形部均与所述连接部(202)连接，所述防爆阀打开时，所述弧形刻痕(201)处断裂，所述圆形部绕所述连接部(202)翻转。
  2. 根据权利要求1所述的定向泄压的电芯，其中，所述圆形部朝向所述壳体(100)的一侧凸设有阶梯槽(210)，所述阶梯槽(210)呈圆形，所述阶梯槽(210)与所述盖板(200)同轴设置。
  3. 根据权利要求1所述的定向泄压的电芯，其中，所述圆形部朝向所述壳体(100)的一侧凸设有多个弧形槽(220)，多个所述弧形槽(220)沿所述阶梯槽(210)的周向设置，相邻的两个所述弧形槽(220)之间形成有加强筋(2201)。
  4. 根据权利要求3所述的定向泄压的电芯，其中，多个所述弧形槽(220)沿所述阶梯槽(210)的周向均匀分布。
  5. 根据权利要求3所述的定向泄压的电芯，其中，所述加强筋(2201)的底壁与侧壁之间呈夹角设置，所述夹角的取值范围为120°～150°。
  6. 根据权利要求3所述的定向泄压的电芯，其中，所述加强筋(2201)的宽度为3mm～5mm。
  7. 根据权利要求3所述的定向泄压的电芯，其中，与所述连接部(202)相对的所述弧形槽(220)上设置有定位筋(2202)。
  8. 根据权利要求1-7中任一项所述的定向泄压的电芯，其中，所述环形部远离所述壳体(100)的一侧凸设有环形凸筋(230)，所述环形凸筋(230)与所述盖板(200)同轴设置。
  9. 根据权利要求1-7中任一项所述的定向泄压的电芯，其中，所述连接部(202)的长度小于所述弧形刻痕(201)的长度，所述连接部(202)的长度为5mm～10mm。
  10. 一种电池模组，包括上述权利要求1-9中任一项所述的定向泄压的电芯，所述定向泄压的电芯设置为多个，多个所述定向泄压的电芯的连接部(202)设置在电芯的同一侧，使得多个所述定向泄压的电芯的防爆阀朝同一方向打开。
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