WO2022198411A1

WO2022198411A1 - Battery cell and power consumption apparatus

Info

Publication number: WO2022198411A1
Application number: PCT/CN2021/082182
Authority: WO
Inventors: 和棒棒; 陈宏浩
Original assignee: 宁德新能源科技有限公司
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2022-09-29
Also published as: CN113906625B; CN113906625A

Abstract

The present application relates to the technical field of batteries, and discloses a battery cell and a power consumption apparatus. The battery cell comprises a casing, an electrode assembly, and a pressure relief assembly. The casing comprises a first wall part and a second wall part which are oppositely arranged. The pressure relief assembly is accommodated in an accommodating cavity and comprises a first pressure relief unit and a second pressure relief unit. The first pressure relief unit comprises a first pressure relief member fixed on the first wall part, and a mounting hole is formed in the end of the first pressure relief member facing the second wall part. The second pressure relief unit comprises a second pressure relief member fixed on the second wall part, and at least part of the second pressure relief member extends into the mounting hole. A seal between the outer wall of the second pressure relief unit and the inner wall of the first pressure relief unit is formed. The pressure relief assembly is provided with a pressure relief channel isolated from the accommodating cavity, and the casing is provided with a pressure relief opening communicated with the pressure relief channel and the external environment. The first and second pressure relief units are configured to cooperate with each other, such that when the temperature of the battery cell is higher than a preset threshold, relative displacement occurs along with the expansion of the casing so that the pressure relief channel is communicated with the accommodating cavity, so as to discharge the gas in the battery cell to the outside, thereby reducing the potential safety hazard caused by the explosion of the battery cell.

Description

电芯与用电装置Cells and electrical devices

技术领域technical field

本申请涉及电池技术领域，尤其涉及一种电芯与用电装置。The present application relates to the technical field of batteries, and in particular, to a battery cell and an electrical device.

背景技术Background technique

电芯是一种将外界的能量转化为电能并储存于其内部，以在需要的时刻对外部设备(如便携式电子设备)进行供电的装置。一般地，电芯包括壳体、收容于壳体内的电极组件以及电解液。其中，电极组件通常包括循环交替设置的正极片、负极片，以及设于两者之间并用于分隔两者的隔离膜。A battery cell is a device that converts external energy into electrical energy and stores it inside to supply power to external devices (such as portable electronic devices) when needed. Generally, a battery cell includes a casing, an electrode assembly accommodated in the casing, and an electrolyte. Wherein, the electrode assembly usually includes a positive electrode sheet, a negative electrode sheet arranged alternately in a cycle, and a separator arranged between the two and used to separate the two.

本申请的发明人在实现本申请的过程中发现：电芯在工作的过程中发热量较大，电芯的持续发热可能导致电芯热失控，使壳体内部气压明显增大，从而导致电芯***；然而目前的电芯并无在高于特定温度时进行防爆保护的结构，工作时具有较高的安全隐患。In the process of realizing the present application, the inventor of the present application found that the cell generates a large amount of heat during operation, and the continuous heating of the cell may lead to thermal runaway of the cell, causing the air pressure inside the casing to increase significantly, thereby causing the electric cell to heat up. The core explodes; however, the current battery does not have a structure for explosion-proof protection when the temperature is higher than a certain temperature, and has a high safety hazard during operation.

发明内容SUMMARY OF THE INVENTION

本申请旨在提供一种电芯与用电装置，以降低电芯工作时的安全隐患。The purpose of the present application is to provide a battery cell and an electrical device, so as to reduce the safety hazard when the battery cell is working.

本申请解决其技术问题采用以下技术方案：This application adopts the following technical solutions to solve its technical problems:

一种电芯，包括壳体、电极组件与泄压组件。所述壳体设有收容腔，所述壳体包括相对设置的第一壁部与第二壁部。所述电极组件收容于所述收容腔。所述电芯还包括收容于所述收容腔的泄压组件。所述泄压组件包括第一泄压单元与第二泄压单元。第一泄压单元包括第一泄压件，所述第一泄压件固定于所述第一壁部，所述第一泄压件朝向所述第二壁部的一端设有安装孔。第二泄压单元包括第二泄压件，所述第二泄压件固定于所述第二壁部，所述第二泄压件至少部分伸入所述安装孔，所述第二泄压单元的外壁与所述第一泄压单元的内壁之间密封。所述泄压组件设有与所述收容腔隔绝的泄压通道，所述壳体设有连通所述泄压通道与所述电芯的外部环境的至少一泄压口。所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述泄压通道与所述收容腔连通。An electric core includes a shell, an electrode assembly and a pressure relief assembly. The housing is provided with a accommodating cavity, and the housing includes a first wall portion and a second wall portion which are oppositely arranged. The electrode assembly is accommodated in the accommodating cavity. The battery cell further includes a pressure relief component accommodated in the accommodating cavity. The pressure relief assembly includes a first pressure relief unit and a second pressure relief unit. The first pressure relief unit includes a first pressure relief piece, the first pressure relief piece is fixed on the first wall portion, and an end of the first pressure relief piece facing the second wall portion is provided with a mounting hole. The second pressure relief unit includes a second pressure relief piece, the second pressure relief piece is fixed on the second wall portion, the second pressure relief piece at least partially extends into the installation hole, and the second pressure relief piece The outer wall of the unit is sealed with the inner wall of the first pressure relief unit. The pressure relief assembly is provided with a pressure relief channel isolated from the accommodating cavity, and the housing is provided with at least one pressure relief port communicating with the pressure relief channel and the external environment of the battery cell. The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery cell is higher than a preset threshold value, relative displacement occurs to the pressure relief with the expansion of the casing. The pressure channel is communicated with the receiving cavity.

作为上述技术方案的进一步改进方案，所述第一泄压件或所述第二泄压件的壁设有贯通的排气孔，所述收容腔与所述泄压通道中的一个与所述排气孔的一端连通，所述第一泄压单元的内壁和所述第二泄压单元的外壁配合以封堵所述排气孔的另一端。所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述排气孔分别连通所述收容腔与所述泄压通道。As a further improvement of the above technical solution, the wall of the first pressure relief member or the second pressure relief member is provided with a through exhaust hole, and one of the accommodating cavity and the pressure relief passage is connected to the One end of the exhaust hole is communicated, and the inner wall of the first pressure relief unit and the outer wall of the second pressure relief unit cooperate to block the other end of the exhaust hole. The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery cell is higher than a preset threshold value, relative displacement occurs to the exhaust gas with the expansion of the casing. The air holes are respectively connected to the receiving cavity and the pressure relief channel.

作为上述技术方案的进一步改进方案，所述第一泄压件于所述安装孔的壁设有与所述收容腔连通的所述排气孔，所述第二泄压单元的外壁封堵所述排气孔。所述泄压通道包括所述安装孔，所述安装孔贯通所述第一泄压件且一端通向所述第一壁部，所述第一壁部于对应所述安装孔处设有所述泄压口；和/或，所述泄压通道包括贯通所述第二泄压件的连通孔，所述连通孔的一端连通所述安装孔，另一端通向所述第二壁部，所述第二壁部于对应所述连通孔处设有所述泄压口。所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述第二泄压单元打开所述排气孔的至少部分。As a further improvement of the above technical solution, the wall of the first pressure relief member is provided with the exhaust hole communicating with the accommodating cavity, and the outer wall of the second pressure relief unit blocks the air outlet. the vent hole. The pressure relief channel includes the installation hole, the installation hole penetrates the first pressure relief piece and has one end leading to the first wall portion, and the first wall portion is provided with a position corresponding to the installation hole. and/or, the pressure relief channel includes a communication hole passing through the second pressure relief member, one end of the communication hole is connected to the installation hole, and the other end is connected to the second wall portion, The second wall portion is provided with the pressure relief port corresponding to the communication hole. The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery core is higher than a preset threshold value, relative displacement occurs to the first pressure relief unit with the expansion of the casing. Two pressure relief units open at least part of the vent hole.

作为上述技术方案的进一步改进方案，所述第一泄压单元还包括同轴固定于所述安装孔的内壁的第一密封圈。所述第一泄压件于所述第一密封圈覆盖的区域设有所述排气孔，所述第一密封圈于对应所述排气孔处设有过孔，所述第二泄压单元与所述第一密封圈过盈配合，所述第二泄压单元的外壁封堵所述过孔。As a further improvement of the above technical solution, the first pressure relief unit further includes a first sealing ring that is coaxially fixed to the inner wall of the installation hole. The first pressure relief member is provided with the exhaust hole in the area covered by the first sealing ring, the first sealing ring is provided with a via hole corresponding to the exhaust hole, and the second pressure relief The unit is in interference fit with the first sealing ring, and the outer wall of the second pressure relief unit blocks the via hole.

作为上述技术方案的进一步改进方案，所述第二泄压单元还包括过盈地套设于所述第二泄压件的第二密封圈。所述第二密封圈与所述第一泄压单元过盈配合并封堵所述排气孔。As a further improvement of the above-mentioned technical solution, the second pressure relief unit further includes a second sealing ring which is sleeved on the second pressure relief member in an interference fit. The second sealing ring is in interference fit with the first pressure relief unit and blocks the exhaust hole.

作为上述技术方案的进一步改进方案，所述第二泄压件设有连通孔，所述第二泄压件于所述连通孔的壁设有贯通的所述排气孔，所述第一泄压单元的内壁封堵所述排气孔。所述泄压通道包括所述连通孔，所述连通孔的一端贯通所述第二泄压件并通向所述第二壁部，所述第二壁部于对应所述连通孔处设有所述泄压口；和/或，所述泄压通道包括所述安装孔，所述连通孔的一端与所述安装孔连通，所述安装孔贯通所述第一泄压件且一端通向所述第一壁部，所述第一壁部于对应所述连通孔处设有所述泄压口。所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述排气孔至少部分退出所述安装孔。As a further improvement of the above technical solution, the second pressure relief member is provided with a communication hole, the second pressure relief member is provided with the exhaust hole passing through the wall of the communication hole, and the first relief member is provided with a communication hole. The inner wall of the pressure unit blocks the exhaust hole. The pressure relief channel includes the communication hole, and one end of the communication hole penetrates the second pressure relief member and leads to the second wall portion, and the second wall portion is provided with a corresponding to the communication hole. the pressure relief port; and/or, the pressure relief channel includes the installation hole, one end of the communication hole communicates with the installation hole, the installation hole penetrates the first pressure relief member and one end leads to the The first wall portion is provided with the pressure relief port corresponding to the communication hole. The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery cell is higher than a preset threshold value, relative displacement occurs to the exhaust gas with the expansion of the casing. The air hole at least partially exits the mounting hole.

作为上述技术方案的进一步改进方案，所述第一泄压单元还包括同轴固定于所述安装孔的内壁的第一密封圈。所述第一密封圈与所述第二泄压单元过盈配合，并封堵所述排气孔。As a further improvement of the above technical solution, the first pressure relief unit further includes a first sealing ring that is coaxially fixed to the inner wall of the installation hole. The first sealing ring is in interference fit with the second pressure relief unit, and blocks the exhaust hole.

作为上述技术方案的进一步改进方案，所述第二泄压单元还包括过盈地套设于所述第二泄压件的第二密封圈。所述第二泄压件于所述第二密封圈覆盖的区域设有所述排气孔，所述第二密封圈于对应所述排气孔处设有过孔。所述第一泄压单元与所述第二密封圈过盈配合，且所述第一泄压单元的内壁封堵所述过孔。As a further improvement of the above-mentioned technical solution, the second pressure relief unit further includes a second sealing ring which is sleeved on the second pressure relief member in an interference fit. The second pressure relief member is provided with the exhaust hole in the area covered by the second sealing ring, and the second sealing ring is provided with a through hole corresponding to the exhaust hole. The first pressure relief unit is in interference fit with the second sealing ring, and the inner wall of the first pressure relief unit blocks the via hole.

作为上述技术方案的进一步改进方案，所述泄压通道包括安装孔，所述安装孔贯通所述第一泄压件且一端通向所述第一壁部，所述第一壁部于对应所述安装孔处设有所述泄压口；和/或，所述泄压通道包括贯通所述第二泄压件的连通孔，所述连通孔的一端与所述安装孔连通，另一端通向所述第二壁部，所述第二壁部于对应所述连通孔处设有所述泄压口。所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述第二泄压件退出所述安装孔。As a further improvement of the above technical solution, the pressure relief channel includes an installation hole, the installation hole penetrates the first pressure relief member and has one end leading to the first wall portion, the first wall portion corresponding to the The installation hole is provided with the pressure relief port; and/or, the pressure relief channel includes a communication hole passing through the second pressure relief member, one end of the communication hole communicates with the installation hole, and the other end communicates with the installation hole. Toward the second wall portion, the second wall portion is provided with the pressure relief port corresponding to the communication hole. The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery core is higher than a preset threshold value, relative displacement occurs to the first pressure relief unit with the expansion of the casing. The second pressure relief piece exits the mounting hole.

作为上述技术方案的进一步改进方案，所述第一泄压单元还包括同轴固定于所述安装孔的内壁的第一密封圈，所述第二泄压单元与所述第一密封圈过盈配合；和/或，所述第二泄压单元还包括过盈地套设于所述第二泄压件的第二密封圈，所述第二密封圈与所述第一泄压单元过盈配合。As a further improvement of the above technical solution, the first pressure relief unit further includes a first sealing ring that is coaxially fixed to the inner wall of the installation hole, and the second pressure relief unit and the first sealing ring are in an interference fit. and/or, the second pressure relief unit further includes a second sealing ring sleeved on the second pressure relief member in an interference fit, and the second sealing ring is in an interference fit with the first pressure relief unit Cooperate.

作为上述技术方案的进一步改进方案，所述壳体还包括连接壁。所述连接壁连接所述第一壁部与所述第二壁部，所述第一壁部、所述第二壁部与所述连接壁共同围成所述收容腔。As a further improvement of the above technical solution, the housing further includes a connecting wall. The connecting wall connects the first wall portion and the second wall portion, and the first wall portion, the second wall portion and the connecting wall together enclose the receiving cavity.

本申请解决其技术问题还采用以下技术方案：The application also adopts the following technical solutions to solve its technical problems:

一种用电装置，包括上述的电芯。An electrical device includes the above-mentioned battery.

本申请的有益效果是：The beneficial effects of this application are:

与目前市场上的电芯相比，本申请实施例提供的电芯设置有泄压通道；在电芯温度高于预设阈值时，壳体发生膨胀；相应地，第一泄压单元与第二泄压单元之间相对位移至，上述泄压通道与壳体内的收容腔连通，从而可将电芯内的气体排出至外界，平衡电芯的内外气压，以降低电芯***的安全隐患。Compared with the batteries currently on the market, the batteries provided in the embodiments of the present application are provided with pressure relief channels; when the temperature of the batteries is higher than the preset threshold, the casing expands; The relative displacement between the two pressure relief units is such that the pressure relief channel communicates with the receiving cavity in the casing, so that the gas in the cell can be discharged to the outside, and the internal and external air pressure of the cell can be balanced to reduce the safety hazard of cell explosion.

附图说明Description of drawings

为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without any creative effort.

图1为本申请其中一实施例提供的电芯处于未膨胀状态下的剖切示意图。FIG. 1 is a schematic cross-sectional view of a cell provided in an embodiment of the present application in an unexpanded state.

图2为图1中的电芯处于膨胀状态下的剖切示意图；FIG. 2 is a schematic cross-sectional view of the battery cell in FIG. 1 in an expanded state;

图3为本申请其中一实施例提供的泄压组件的剖切示意图；3 is a schematic cross-sectional view of a pressure relief assembly provided in one embodiment of the present application;

图4为本申请其中另一实施例提供的泄压组件的剖切示意图；4 is a schematic cross-sectional view of a pressure relief assembly provided by another embodiment of the present application;

图5为本申请其中又一实施例提供的泄压组件的剖切示意图；5 is a schematic cross-sectional view of a pressure relief assembly provided by another embodiment of the present application;

图6为本申请其中又一实施例提供的泄压组件的剖切示意图；6 is a schematic cross-sectional view of a pressure relief assembly provided by another embodiment of the present application;

图7为本申请其中又一实施例提供的泄压组件的剖切示意图；7 is a schematic cross-sectional view of a pressure relief assembly provided by another embodiment of the present application;

图8为本申请其中又一实施例提供的泄压组件的剖切示意图；8 is a schematic cross-sectional view of a pressure relief assembly provided by another embodiment of the present application;

图9为本申请其中一实施例提供的用电装置的示意图。FIG. 9 is a schematic diagram of an electrical device provided by an embodiment of the present application.

图中：In the picture:

1、电芯；1. Cell;

100、壳体；110、第一壁部；120、第二壁部；130、连接壁；101、收容腔； 102、泄压口；100, housing; 110, first wall; 120, second wall; 130, connecting wall; 101, receiving cavity; 102, pressure relief port;

200、电极组件；210、第一极片；220、第二极片；230、隔离膜；200, electrode assembly; 210, first pole piece; 220, second pole piece; 230, isolation membrane;

300、泄压组件；310、第一泄压单元；320、第二泄压单元；311、第一泄压件；312、第一凸缘；321、第二泄压件；322、第二凸缘；301、泄压通道；302、安装孔；303、排气孔；300, pressure relief assembly; 310, first pressure relief unit; 320, second pressure relief unit; 311, first pressure relief piece; 312, first flange; 321, second pressure relief piece; 322, second convex edge; 301, pressure relief channel; 302, mounting hole; 303, exhaust hole;

300b、泄压组件；310b、第一泄压单元；320b、第二泄压单元；311b、第一泄压件；321b、第二泄压件；301b、泄压通道；302b、安装孔；303b、排气孔；304b、连通孔；300b, pressure relief assembly; 310b, first pressure relief unit; 320b, second pressure relief unit; 311b, first pressure relief piece; 321b, second pressure relief piece; 301b, pressure relief passage; 302b, mounting hole; 303b , exhaust hole; 304b, communication hole;

300c、泄压组件；310c、第一泄压单元；320c、第二泄压单元；311c、第一泄压件；321c、第二泄压件；301c、泄压通道；302c、安装孔；303c、排气孔；304c、连通孔；300c, pressure relief assembly; 310c, first pressure relief unit; 320c, second pressure relief unit; 311c, first pressure relief piece; 321c, second pressure relief piece; 301c, pressure relief passage; 302c, mounting hole; 303c , exhaust hole; 304c, communication hole;

300d、泄压组件；310d、第一泄压单元；320d、第二泄压单元；311d、第一泄压件；321d、第二泄压件；301d、泄压通道；302d、安装孔；303d、排气孔；304d、连通孔；300d, pressure relief assembly; 310d, first pressure relief unit; 320d, second pressure relief unit; 311d, first pressure relief piece; 321d, second pressure relief piece; 301d, pressure relief passage; 302d, mounting hole; 303d , exhaust hole; 304d, communication hole;

300e、泄压组件；310e、第一泄压单元；320e、第二泄压单元；311e、第一泄压件；321e、第二泄压件；301e、泄压通道；302e、安装孔；303e、排气孔；304e、连通孔；300e, pressure relief assembly; 310e, first pressure relief unit; 320e, second pressure relief unit; 311e, first pressure relief piece; 321e, second pressure relief piece; 301e, pressure relief passage; 302e, mounting hole; 303e , exhaust hole; 304e, communication hole;

300f、泄压组件；310f、第一泄压单元；320f、第二泄压单元；311f、第一泄压件；321f、第二泄压件；301f、泄压通道；302f、安装孔；303f、排气孔；304f、连通孔。300f, pressure relief assembly; 310f, first pressure relief unit; 320f, second pressure relief unit; 311f, first pressure relief piece; 321f, second pressure relief piece; 301f, pressure relief passage; 302f, mounting hole; 303f , exhaust hole; 304f, communication hole.

2、用电装置。2. Electrical device.

具体实施方式Detailed ways

为了便于理解本申请，下面结合附图和具体实施例，对本申请进行更详细的说明。需要说明的是，当元件被表述“固定于”/“固接于”另一个元件，它可以直接在另一个元件上、或者其间可以存在一个或多个居中的元件。当一个元件被表述“连接”另一个元件，它可以是直接连接到另一个元件、或者其间可以存在一个或多个居中的元件。本说明书所使用的术语“垂直的”、“水平的”、“左”、“右”、“内”、“外”以及类似的表述只是为了说明的目的。In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to"/"fixed to" another element, it can be directly on the other element, or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are for illustrative purposes only.

除非另有定义，本说明书所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是用于限制本申请。本说明书所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments, and are not used to limit the present application. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

此外，下面所描述的本申请不同实施例中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict with each other.

在本说明书中，所述“安装”包括焊接、螺接、卡接、粘合等方式将某一元件或装置固定或限制于特定位置或地方，所述元件或装置可在特定位置或地方保持不动也可在限定范围内活动，所述元件或装置固定或限制于特定位置或地方后可进行拆卸也可不能进行拆卸，在本申请实施例中不作限制。In this specification, the "installation" includes welding, screwing, snapping, gluing, etc. to fix or restrict a certain element or device to a specific position or place, and the element or device can be held in a specific position or place. It can also move within a limited range without moving, and the element or device can be disassembled or not disassembled after being fixed or restricted in a specific position or place, which is not limited in the embodiments of the present application.

请参阅图1至图3，其分别示出了本申请其中一实施例提供的电芯1处于未膨胀状态下的剖切示意图、处于膨胀状态下的剖切示意图，以及泄压组件300的一个实施例的剖切示意图，该电芯1包括壳体100、电极组件200以及泄压组件300。其中，壳体100设有收容腔101，该壳体100包括相对设置的第一壁部110与第二壁部120。电极组件200收容于上述收容腔101。泄压组件300亦收容于上述收容腔101，其包括第一泄压单元310与第二泄压单元320。第一泄压单元310包括第一泄压件311，该第一泄压件311固定于上述第一壁部110；第一泄压件311朝向第二壁部120的一端设有安装孔302。第二泄压单元320包括第二泄压件321，该第二泄压件321固定于上述第二壁部120；第二泄压件321的至少部分伸入上述安装孔302。第二泄压单元320的外壁与第一泄压单元310的内壁之间密封。泄压组件300设有与上述收容腔101隔绝的泄压通道301，壳体100设有分别连通泄压通道301与电芯1的外部环境的至少一泄压口102。上述第一泄压单元310与第二泄压单元320用于共同配合，以在电芯1的温度高于预设阈值时，随壳体100的膨胀而发生相对位移至泄压通道301与收容腔101连通。值得一提的是，本申请文件中所述的“预设阈值”，是指电芯1在某温度下能够膨胀至恰好使收容腔101与泄压通道301连通时的温度值；即是说在电芯1的温度高于该预设阈值的状态下充分膨胀后，其内的泄压通道301将与收容腔101连通。Please refer to FIG. 1 to FIG. 3 , which respectively show a schematic cross-sectional view of the battery cell 1 in an unexpanded state, a schematic cross-sectional view in an expanded state, and one of the pressure relief components 300 provided by one of the embodiments of the present application. A schematic cross-sectional view of an embodiment, the battery cell 1 includes a casing 100 , an electrode assembly 200 and a pressure relief assembly 300 . The housing 100 is provided with a receiving cavity 101 , and the housing 100 includes a first wall portion 110 and a second wall portion 120 that are oppositely disposed. The electrode assembly 200 is accommodated in the above-mentioned accommodating cavity 101 . The pressure relief assembly 300 is also accommodated in the above-mentioned receiving cavity 101 , and includes a first pressure relief unit 310 and a second pressure relief unit 320 . The first pressure relief unit 310 includes a first pressure relief member 311 , and the first pressure relief member 311 is fixed on the first wall portion 110 ; an end of the first pressure relief member 311 facing the second wall portion 120 is provided with a mounting hole 302 . The second pressure relief unit 320 includes a second pressure relief member 321 , and the second pressure relief member 321 is fixed to the second wall portion 120 ; at least a part of the second pressure relief member 321 extends into the installation hole 302 . The outer wall of the second pressure relief unit 320 is sealed with the inner wall of the first pressure relief unit 310 . The pressure relief assembly 300 is provided with a pressure relief channel 301 isolated from the above-mentioned accommodating cavity 101 , and the housing 100 is provided with at least one pressure relief port 102 respectively communicating with the pressure relief channel 301 and the external environment of the battery cell 1 . The above-mentioned first pressure relief unit 310 and second pressure relief unit 320 are used to cooperate together, so that when the temperature of the battery cell 1 is higher than the preset threshold, relative displacement occurs to the pressure relief channel 301 and the storage chamber 100 with the expansion of the casing 100 . The cavity 101 communicates. It is worth mentioning that the “preset threshold value” mentioned in this application document refers to the temperature value at which the battery cell 1 can expand to the point where the containment cavity 101 and the pressure relief channel 301 communicate with each other at a certain temperature; After the battery cell 1 is fully expanded in a state where the temperature of the battery cell 1 is higher than the preset threshold, the pressure relief channel 301 therein will communicate with the receiving cavity 101 .

对于上述壳体100，请参阅图1与图2，该壳体100设有收容腔101，上述电极组件200以及泄压组件300均收容于该收容腔101。具体地，壳体100包括第一壁部110、第二壁部120以及连接壁130。其中，第一壁部110与第二壁部 120之间相对设置，连接壁130的两端分别一一对应地连接第一壁部110与第二壁部120，该第一壁部110、第二壁部120与连接壁130共同围成上述收容腔101。本实施例中，第一壁部110与连接壁130一体成型，第二壁部120与连接壁130之间通过激光焊接固定连接；可以理解的是，在本申请的其他实施例中，第一壁部110与连接壁130之间亦可以通过激光焊接、粘接等其他方式实现固定连接。值得一提的是，为便于说明，以下将第一壁部110指向第二壁部120的方向定义为预设方向X。Please refer to FIG. 1 and FIG. 2 for the case 100 . The case 100 is provided with a accommodating cavity 101 , and the electrode assembly 200 and the pressure relief assembly 300 are accommodated in the accommodating cavity 101 . Specifically, the housing 100 includes a first wall portion 110 , a second wall portion 120 and a connecting wall 130 . The first wall portion 110 and the second wall portion 120 are disposed opposite to each other, and both ends of the connecting wall 130 are respectively connected to the first wall portion 110 and the second wall portion 120 in a one-to-one correspondence. The two wall portions 120 and the connecting wall 130 together enclose the above-mentioned receiving cavity 101 . In this embodiment, the first wall portion 110 and the connecting wall 130 are integrally formed, and the second wall portion 120 and the connecting wall 130 are fixedly connected by laser welding; The wall portion 110 and the connecting wall 130 can also be fixedly connected by other means such as laser welding, bonding, and the like. It is worth mentioning that, for the convenience of description, the direction in which the first wall portion 110 points to the second wall portion 120 is defined as the predetermined direction X below.

对于上述电极组件200，请继续参阅图1与图2，其是电芯1的核心部件，本实施例中，电极组件200为卷绕式结构，其包括层叠设置的第一极片210、第二极片220，以及设于第一极片210与第二极片220之间的隔离膜230。该电极组件200整体呈柱状结构，该电极组件200卷绕所环绕的轴线方向与第一壁部110指向第二壁部120的方向相同。其中，第一极片210与第二极片220中的一个为正极片，另一个为负极片。当然，在本申请的其他实施例中，电极组件200亦可以是叠片式结构，本申请不对电极组件的具体结构形式作出限定。此外，电芯1还包括填充于收容腔101内的电解液，上述电极组件200浸于电解液中。For the above-mentioned electrode assembly 200, please continue to refer to FIG. 1 and FIG. 2, which is the core component of the battery core 1. In this embodiment, the electrode assembly 200 is a wound structure, which includes a first pole piece 210, a second pole piece 210, a The diode piece 220 and the isolation film 230 disposed between the first pole piece 210 and the second pole piece 220 . The electrode assembly 200 has a cylindrical structure as a whole, and the direction of the axis around which the electrode assembly 200 is wound is the same as the direction in which the first wall portion 110 points to the second wall portion 120 . Wherein, one of the first pole piece 210 and the second pole piece 220 is a positive pole piece, and the other is a negative pole piece. Of course, in other embodiments of the present application, the electrode assembly 200 may also be a laminated structure, and the present application does not limit the specific structural form of the electrode assembly. In addition, the battery cell 1 further includes an electrolyte filled in the accommodating cavity 101 , and the above-mentioned electrode assembly 200 is immersed in the electrolyte.

对于泄压组件300，请具体参阅图3，其示出了本申请其中一实施例提供的泄压组件300的剖切示意图，同时结合图1与图2，泄压组件300包括收容于上述收容腔101内的第一泄压单元310与第二泄压单元320。其中，第一泄压单元310包括第一泄压件311。该第一泄压件311呈上述预设方向X延伸的杆状结构，并固定于第一壁部110，该第一泄压件311朝向上述第二壁部120的一端设有安装孔302。上述电极组件200以该第一泄压单元310为中轴进行卷绕，即是说：电极组件200卷绕所环绕的轴线方向与上述预设方向平行。较优地，该第一泄压件311靠近第一壁部110的一端向外延伸而形成一第一凸缘312；第一泄压件311设有第一凸缘312的一端通过激光焊接、粘接等方式固定于第一壁部110。第一凸缘312的设置有效增大了第一泄压件311靠近第一壁部110的一端的截面积，即是可增加第一泄压件311与第一壁部110之间的固定面积，有利于增强第一泄压件311与第一壁部110之间的连接强度。For the pressure relief assembly 300 , please refer to FIG. 3 , which shows a schematic cross-sectional view of the pressure relief assembly 300 provided by one of the embodiments of the present application. In conjunction with FIGS. 1 and 2 , the pressure relief assembly 300 includes a The first pressure relief unit 310 and the second pressure relief unit 320 in the cavity 101 . Wherein, the first pressure relief unit 310 includes a first pressure relief member 311 . The first pressure relief member 311 has a rod-like structure extending in the predetermined direction X, and is fixed to the first wall portion 110 . An end of the first pressure relief member 311 facing the second wall portion 120 is provided with a mounting hole 302 . The above-mentioned electrode assembly 200 is wound with the first pressure relief unit 310 as the central axis, that is, the direction of the axis around which the electrode assembly 200 is wound is parallel to the above-mentioned predetermined direction. Preferably, one end of the first pressure relief member 311 close to the first wall portion 110 extends outward to form a first flange 312; the end of the first pressure relief member 311 with the first flange 312 is laser welded, It is fixed to the first wall portion 110 by means of bonding or the like. The arrangement of the first flange 312 effectively increases the cross-sectional area of the end of the first pressure relief member 311 close to the first wall portion 110 , that is, the fixed area between the first pressure relief member 311 and the first wall portion 110 can be increased , which is beneficial to enhance the connection strength between the first pressure relief member 311 and the first wall portion 110 .

第二泄压单元320包括第二泄压件321；该第一泄压件311亦呈沿上述预设方向X延伸的杆状结构，并固定于第二壁部120。第二泄压件321的位置与第一泄压件311对应，其至少部分伸入上述安装孔302。该第二泄压单元320的外壁与上述第一泄压单元310的内壁之间密封，从而避免壳体100内的电解液在电芯1正常状态时即向外界逸出。The second pressure relief unit 320 includes a second pressure relief member 321 ; the first pressure relief member 311 also has a rod-shaped structure extending along the predetermined direction X, and is fixed to the second wall portion 120 . The position of the second pressure relief member 321 corresponds to the position of the first pressure relief member 311 , which at least partially protrudes into the above-mentioned mounting hole 302 . The outer wall of the second pressure relief unit 320 is sealed with the inner wall of the first pressure relief unit 310, so as to prevent the electrolyte in the casing 100 from escaping to the outside when the cell 1 is in a normal state.

泄压组件300内设有泄压通道301，上述壳体100设有与该泄压通道301连通的泄压口102。上述第一泄压单元310与第二泄压单元320用于共同配合，以在电芯1的温度高于预设阈值时，随壳体100的膨胀而发生相对位移，以使泄压通道301与收容腔101连通。如此，在电芯1持续发热导致收容腔101内的气压明显大于外界气压时，电芯1内部的气体可通过泄压通道301及泄压口102向外界逸出，从而实现防爆的效果。The pressure relief assembly 300 is provided with a pressure relief passage 301 , and the above-mentioned housing 100 is provided with a pressure relief port 102 communicating with the pressure relief passage 301 . The above-mentioned first pressure relief unit 310 and the second pressure relief unit 320 are used to cooperate together, so that when the temperature of the battery cell 1 is higher than the preset threshold, relative displacement occurs with the expansion of the casing 100 , so that the pressure relief channel 301 is relatively displaced. It communicates with the receiving cavity 101 . In this way, when the battery cell 1 continues to heat up and the air pressure in the housing cavity 101 is significantly higher than the outside air pressure, the gas inside the battery cell 1 can escape to the outside through the pressure relief channel 301 and the pressure relief port 102, thereby achieving an explosion-proof effect.

本实施例中，请继续参阅图3，并结合图1与图2，上述安装孔302的壁设有贯通的排气孔303，该排气孔303的两端分别通向收容腔101与安装孔302。上述第二泄压件321至少部分伸入上述安装孔302，其外壁与安装孔302的内壁适配贴合，从而使第一泄压单元310的内壁与第二泄压单元320的外壁密封；同时该第二泄压件321封堵上述排气孔303。泄压通道301包括安装孔302；该安装孔302贯穿第一泄压件311，且该安装孔302靠近第一壁部110的一端通向第一壁部110，该泄压通道301通过第二泄压单元320的外壁实现与收容腔的隔绝。相应地，上述第一壁部110于对应安装孔302的位置设有泄压口102。则，当电芯1的温度高于预设温度时，壳体100膨胀致使第一壁部110与第二壁部120之间的间隙将变大，进而使第一泄压单元310与第二泄压单元320发生相对位移至第二泄压单元320打开排气孔303的至少部分，从而使上述收容腔101与安装孔302连通；则收容腔101内的气体可依次通过上述排气孔303、安装孔302以及第一壁部110上的泄压口102逸出向电芯的外界。In this embodiment, please continue to refer to FIG. 3 , and in conjunction with FIG. 1 and FIG. 2 , the wall of the mounting hole 302 is provided with an exhaust hole 303 penetrating through it, and the two ends of the exhaust hole 303 respectively lead to the receiving cavity 101 and the installation hole 302. The above-mentioned second pressure relief member 321 at least partially extends into the above-mentioned installation hole 302, and its outer wall is adapted to fit with the inner wall of the installation hole 302, so that the inner wall of the first pressure relief unit 310 is sealed with the outer wall of the second pressure relief unit 320; At the same time, the second pressure relief member 321 blocks the above-mentioned exhaust hole 303 . The pressure relief channel 301 includes a mounting hole 302; the mounting hole 302 penetrates the first pressure relief member 311, and one end of the mounting hole 302 close to the first wall portion 110 leads to the first wall portion 110, and the pressure relief channel 301 passes through the second pressure relief member 311. The outer wall of the pressure relief unit 320 is isolated from the receiving cavity. Correspondingly, the first wall portion 110 is provided with a pressure relief port 102 at a position corresponding to the mounting hole 302 . Then, when the temperature of the battery cell 1 is higher than the preset temperature, the casing 100 expands, so that the gap between the first wall portion 110 and the second wall portion 120 will become larger, so that the first pressure relief unit 310 and the second pressure relief unit 310 and the second wall portion 120 are enlarged The pressure relief unit 320 is relatively displaced until the second pressure relief unit 320 opens at least part of the exhaust hole 303, so that the above-mentioned accommodating cavity 101 is communicated with the installation hole 302; then the gas in the accommodating cavity 101 can sequentially pass through the above-mentioned exhaust hole 303 , the installation hole 302 and the pressure relief port 102 on the first wall portion 110 to escape to the outside of the cell.

可以理解的是，即使本实施例中，排气孔303是设于安装孔302的壁，泄压通道301包括上述安装孔302，但本申请并不局限于此。例如，图4示出了本申请其中另一实施例提供的泄压组件300b的剖切示意图，该泄压组件300b仍包括第一泄压单元310b与第二泄压单元320b；该第一泄压单元310b包括第一泄压件311b，该第二泄压单元320b包括第二泄压件321b。该泄压组件300b与上述实施例中的泄压组件300基本相同，两者的主要不同在于：上一实施例中泄压组件300的泄压通道301的出口通向第一壁部，而本实施例中泄压组件300b的出口通向第二壁部。具体来讲，第一泄压件311b于靠近第二壁部的一端仍设有安装孔302b，但该安装孔302b为盲孔，该安装孔302b靠近第一壁部的一端并未贯穿第一泄压件311b；安装孔302b的壁设有排气孔303b。同时，第二泄压件321b至少部分伸入上述安装孔302b，并封堵排气孔303b；第二泄压件321b设有贯通的连通孔304b，该连通孔304b的一端与上述安装孔302b连通，另一端通向第二壁部。本实施例中，泄压通道301b则包括安装孔302b与连通孔304b；相应地，上述第二壁部120b于对应连通孔304b处设有泄压口。则，当电芯的温度高于预设温度时，壳体膨胀而致使第一壁部与第二壁部之间的间隙将变大，进而使第一泄压单元310b与第二泄压单元320b发生相对位移至第二泄压单元320b打开排气孔303b的至少部分，从而使上述收容腔、排气孔303b、安装孔302b与连通孔304b依次连通；则收容腔内产生的气体可依次通过上述排气孔303b、安装孔302b、连通孔304b以及第二壁部上的泄压口102逸出向电芯的外界。It can be understood that even though in this embodiment, the exhaust hole 303 is provided on the wall of the installation hole 302 and the pressure relief channel 301 includes the above-mentioned installation hole 302 , the present application is not limited to this. For example, FIG. 4 shows a schematic cross-sectional view of a pressure relief assembly 300b provided by another embodiment of the present application. The pressure relief assembly 300b still includes a first pressure relief unit 310b and a second pressure relief unit 320b; the first pressure relief unit 300b The pressure unit 310b includes a first pressure relief member 311b, and the second pressure relief unit 320b includes a second pressure relief member 321b. The pressure relief assembly 300b is basically the same as the pressure relief assembly 300 in the above-mentioned embodiment, and the main difference between the two is that the outlet of the pressure relief passage 301 of the pressure relief assembly 300 in the previous embodiment leads to the first wall, while this The outlet of the pressure relief assembly 300b in the embodiment leads to the second wall. Specifically, the first pressure relief member 311b still has a mounting hole 302b at the end close to the second wall, but the mounting hole 302b is a blind hole, and the end of the mounting hole 302b close to the first wall does not penetrate the first wall The pressure relief piece 311b; the wall of the mounting hole 302b is provided with an exhaust hole 303b. At the same time, the second pressure relief piece 321b at least partially extends into the above-mentioned mounting hole 302b and blocks the exhaust hole 303b; the second pressure relief piece 321b is provided with a through communication hole 304b, one end of the communication hole 304b is connected to the above-mentioned installation hole 302b communicated, and the other end leads to the second wall portion. In this embodiment, the pressure relief passage 301b includes an installation hole 302b and a communication hole 304b; correspondingly, the second wall portion 120b is provided with a pressure relief port corresponding to the communication hole 304b. Then, when the temperature of the battery cell is higher than the preset temperature, the casing expands, so that the gap between the first wall portion and the second wall portion becomes larger, thereby causing the first pressure relief unit 310b and the second pressure relief unit 320b is relatively displaced until the second pressure relief unit 320b opens at least part of the exhaust hole 303b, so that the above-mentioned receiving cavity, the exhaust hole 303b, the installation hole 302b and the communication hole 304b are communicated in sequence; then the gas generated in the receiving cavity can be sequentially Through the above-mentioned exhaust hole 303b, the installation hole 302b, the communication hole 304b and the pressure relief port 102 on the second wall, it escapes to the outside of the battery cell.

又例如，图5示出了本申请其中又一实施例提供的泄压组件300c，该泄压组件300c仍包括第一泄压单元310c与第二泄压单元320c；该第一泄压单元310c包括第一泄压件311c，该第二泄压单元320c包括第二泄压件321c。该泄压组件300c与上述实施例中的泄压组件300基本相同，两者的主要不同在于：泄压组件300中泄压通道301的出口通向第一壁部110；而本实施例中泄压组件300c的泄压通道301c具有双侧出口，该泄压通道301c的至少一出口通向第一壁部，至少一出口通向第二壁部。具体来讲，第一泄压件311c仍设有贯通的安装孔302c，该安装孔302c的一端通向第一壁部，另一端朝向第二壁部；安装孔302c的壁设有排气孔303c。第二泄压件321c至少部分伸入上述安装孔302c，并封堵排气孔303c；该第二泄压件321c还设有连通孔304c，该连通孔304c的一端与上述安装孔302c连通，另一端通向第二壁部。泄压通道301c包括安装孔302c与连通孔304c；相应地，上述第一壁部于对应安装孔302c处设有泄压口，第二壁部于对应连通孔304c处亦设有泄压口。则，当电芯的温度高于预设温度时，壳体膨胀而致使第一壁部与第二壁部之间的间隙将变大，进而使第一泄压单元310c与第二泄压单元320c发生相对位移至第二泄压单元320打开排气孔303c的至少部分，从而使上述收容腔、安装孔302与连通孔304依次连通；收容腔101内产生的气体部分可依次通过上述排气孔303c、安装孔302c以及第一壁部上的泄压口逸出向电芯的外界，另一部分可依次通过上述排气孔303c、安装孔302c、连通孔304以及第二壁部120c上的泄压口逸出向电芯的外界。For another example, FIG. 5 shows a pressure relief assembly 300c provided by another embodiment of the present application. The pressure relief assembly 300c still includes a first pressure relief unit 310c and a second pressure relief unit 320c; the first pressure relief unit 310c Including the first pressure relief piece 311c, the second pressure relief unit 320c includes the second pressure relief piece 321c. The pressure relief assembly 300c is basically the same as the pressure relief assembly 300 in the above-mentioned embodiment. The main difference between the two is that the outlet of the pressure relief passage 301 in the pressure relief assembly 300 leads to the first wall portion 110; The pressure relief passage 301c of the pressure assembly 300c has double-sided outlets, at least one outlet of the pressure relief passage 301c leads to the first wall portion, and at least one outlet leads to the second wall portion. Specifically, the first pressure relief member 311c is still provided with a through mounting hole 302c, one end of the mounting hole 302c leads to the first wall portion, and the other end faces the second wall portion; the wall of the mounting hole 302c is provided with an exhaust hole 303c. The second pressure relief piece 321c at least partially protrudes into the above-mentioned mounting hole 302c, and blocks the exhaust hole 303c; the second pressure relief piece 321c is further provided with a communication hole 304c, and one end of the communication hole 304c communicates with the above-mentioned installation hole 302c, The other end leads to the second wall portion. The pressure relief channel 301c includes a mounting hole 302c and a communication hole 304c; correspondingly, the first wall portion is provided with a pressure relief port corresponding to the mounting hole 302c, and the second wall portion is also provided with a pressure relief port corresponding to the communication hole 304c. Then, when the temperature of the battery cell is higher than the preset temperature, the casing expands, so that the gap between the first wall portion and the second wall portion becomes larger, thereby causing the first pressure relief unit 310c and the second pressure relief unit 320c is relatively displaced to the second pressure relief unit 320 to open at least part of the exhaust hole 303c, so that the above-mentioned accommodating cavity, the mounting hole 302 and the communication hole 304 are communicated in turn; the part of the gas generated in the accommodating cavity 101 can pass through the above-mentioned exhaust in sequence. The hole 303c, the installation hole 302c and the pressure relief port on the first wall part escape to the outside of the battery cell, and the other part can pass through the above-mentioned exhaust hole 303c, the installation hole 302c, the communication hole 304 and the second wall part 120c in sequence. The pressure relief port escapes to the outside of the cell.

应当理解，即是上述三实施例中的排气孔均设于第一泄压件的壁上，但本申请并不局限于此，在本实施例的其他实施例中，排气孔亦可以设于第二泄压件的壁上。具体地，图6至图8分别示出了本申请其中另外三实施例提供的泄压组件的剖切示意图，同时结合图1至图5，接下来分别对该三实施例提供的泄压组件的结构进行说明。It should be understood that the exhaust holes in the above three embodiments are all provided on the wall of the first pressure relief member, but the present application is not limited to this. In other embodiments of this embodiment, the exhaust holes may also be It is arranged on the wall of the second pressure relief piece. Specifically, FIGS. 6 to 8 respectively show the cross-sectional schematic diagrams of the pressure relief assemblies provided by the other three embodiments of the present application. At the same time, with reference to FIGS. 1 to 5 , the following are the pressure relief assemblies provided by the three embodiments respectively. structure is explained.

首先，请参阅图6，并结合其他附图，泄压组件300d仍包括第一泄压单元310d与第二泄压单元320d；该第一泄压单元310d包括第一泄压件311d，该第二泄压单元320d包括第二泄压件321d。该泄压组件300d与上述实施例中的泄压组件300基本相同，两者的主要不同在于：泄压组件300中排气孔303设于第一泄压件311；而本实施例中泄压组件300d的排气孔303d设于第二泄压件321d。具体地，第一泄压件311d仍设有贯通的安装孔302d，该安装孔302d的一端通向第一壁部，另一端朝向第二壁部。第二泄压件321d至少部分伸入上述安装孔302d，其面向第一泄压件311d的一端设有与安装孔302d相连通的连通孔304d；同时，第二泄压件321d于连通孔304d的壁设有贯通的排气孔303d，上述第一泄压件311d的内壁封堵排气孔303d。泄压通道301d包括安装孔302d与连通孔304d；相应地，上述第一壁部于对应安装孔302d处设有泄压口。则，当电芯的温度高于预设温度时，壳体膨胀而致使第一壁部与第二壁部之间的间隙将变大，进而使第一泄压单元310d与第二泄压单元320d发生相对位移至排气孔303d的至少部分退出上述安装孔302d，从而使上述收容腔101、排气孔303d连通孔304d、与安装孔302d依次连通；收容腔内产生的气体可依次通过上述排气孔303d、连通孔304d、安装孔302d以及第一壁部上的泄压口逸出向电芯的外界。First of all, please refer to FIG. 6 in combination with other drawings, the pressure relief assembly 300d still includes a first pressure relief unit 310d and a second pressure relief unit 320d; the first pressure relief unit 310d includes a first pressure relief member 311d, the first pressure relief unit 310d The second pressure relief unit 320d includes a second pressure relief member 321d. The pressure relief assembly 300d is basically the same as the pressure relief assembly 300 in the above-mentioned embodiment. The main difference between the two is that the exhaust hole 303 in the pressure relief assembly 300 is provided in the first pressure relief member 311; The exhaust hole 303d of the assembly 300d is provided on the second pressure relief member 321d. Specifically, the first pressure relief member 311d is still provided with a through mounting hole 302d, one end of the mounting hole 302d leads to the first wall portion, and the other end faces the second wall portion. The second pressure relief member 321d at least partially extends into the above-mentioned mounting hole 302d, and its end facing the first pressure relief member 311d is provided with a communication hole 304d that communicates with the installation hole 302d; meanwhile, the second pressure relief member 321d is connected to the communication hole 304d The wall of the first pressure relief member 311d is provided with a through vent hole 303d, and the inner wall of the first pressure relief member 311d blocks the vent hole 303d. The pressure relief passage 301d includes an installation hole 302d and a communication hole 304d; correspondingly, the first wall portion is provided with a pressure relief port corresponding to the installation hole 302d. Then, when the temperature of the battery cell is higher than the preset temperature, the casing expands, so that the gap between the first wall portion and the second wall portion becomes larger, thereby causing the first pressure relief unit 310d and the second pressure relief unit 320d is relatively displaced until at least part of the exhaust hole 303d exits the above-mentioned installation hole 302d, so that the above-mentioned accommodating cavity 101, the exhaust hole 303d communicate with the hole 304d, and the installation hole 302d in sequence; the gas generated in the accommodating cavity can pass through the above-mentioned The exhaust hole 303d, the communication hole 304d, the installation hole 302d and the pressure relief port on the first wall part escape to the outside of the battery cell.

然后，请参阅图7，并结合其他附图，泄压组件300e仍包括第一泄压单元310e与第二泄压单元320e；该第一泄压单元310e包括第一泄压件311e，该第二泄压单元320e包括第二泄压件321e。该泄压组件300e与上述实施例中的泄压组件300d基本相同，两者的主要不同在于：上一实施例中泄压组件300d的泄压通道301d的出口通向第一壁部，而本实施例中泄压组件300e的出口通向第二壁部。具体地，第一泄压件311e于靠近第二壁部的一端仍设有安装孔302e，但该安装孔302e为盲孔，即该安装孔302靠近第一壁部的一端并未贯穿第一泄压件311e。同时，第二泄压件321e至少部分伸入上述安装孔302e，其设有连通孔304e，该连通孔304e的一端贯通第二泄压件321e并通向第二壁部；同时，第二泄压件321e于连通孔304e的壁设有贯通的排气孔303e，上述第一泄压件311e的内壁封堵排气孔303e。本实施例中，泄压通道301e则包括安装孔302e与连通孔304e；相应地，上述第二壁部120e于对应连通孔304e处设有泄压口。则，当电芯的温度高于预设温度时，壳体膨胀而致使第一壁部与第二壁部之间的间隙将变大，进而使第一泄压单元310e与第二泄压单元320e发生相对位移至排气孔303e的至少部分退出上述安装孔302e，从而使上述收容腔、排气孔303、连通孔304依次连通；则收容腔内产生的气体可依次通过上述排气孔303e、连通孔304e以及第二壁部上的泄压口逸出向电芯的外界。Then, please refer to FIG. 7 in combination with other drawings, the pressure relief assembly 300e still includes a first pressure relief unit 310e and a second pressure relief unit 320e; the first pressure relief unit 310e includes a first pressure relief member 311e, the first pressure relief unit 310e The second pressure relief unit 320e includes a second pressure relief member 321e. The pressure relief assembly 300e is basically the same as the pressure relief assembly 300d in the above-mentioned embodiment, the main difference between the two is that the outlet of the pressure relief passage 301d of the pressure relief assembly 300d in the previous embodiment leads to the first wall, while the present The outlet of the pressure relief assembly 300e in the embodiment leads to the second wall. Specifically, the first pressure relief member 311e still has a mounting hole 302e at the end close to the second wall, but the mounting hole 302e is a blind hole, that is, the end of the mounting hole 302 close to the first wall does not penetrate through the first wall. Pressure relief piece 311e. At the same time, the second pressure relief member 321e at least partially protrudes into the above-mentioned mounting hole 302e, and is provided with a communication hole 304e, and one end of the communication hole 304e penetrates the second pressure relief member 321e and leads to the second wall; The pressure piece 321e is provided with an exhaust hole 303e passing through the wall of the communication hole 304e, and the inner wall of the first pressure relief piece 311e blocks the exhaust hole 303e. In this embodiment, the pressure relief passage 301e includes an installation hole 302e and a communication hole 304e; correspondingly, the second wall portion 120e is provided with a pressure relief port corresponding to the communication hole 304e. Then, when the temperature of the battery cell is higher than the preset temperature, the casing expands, so that the gap between the first wall portion and the second wall portion becomes larger, thereby causing the first pressure relief unit 310e and the second pressure relief unit The relative displacement of 320e occurs until at least part of the exhaust hole 303e exits the above-mentioned mounting hole 302e, so that the above-mentioned receiving cavity, the exhaust hole 303 and the communication hole 304 are connected in sequence; then the gas generated in the receiving cavity can pass through the above-mentioned exhaust hole 303e in turn. , the communication hole 304e and the pressure relief port on the second wall to escape to the outside of the cell.

接下来，请参阅图8，并结合其他附图，该泄压组件300f仍包括第一泄压单元310f与第二泄压单元320f；该第一泄压单元310f包括第一泄压件311f，该第二泄压单元320f包括第二泄压件321f。该泄压组件300f与上述实施例中的泄压组件300d基本相同，两者的主要不同在于：泄压组件300d中泄压通道301d的出口通向第一壁部；而本实施例中泄压组件300f的泄压通道301f具有双侧出口，该泄压通道301f的至少一出口通向第一壁部，至少一出口通向第二壁部。具体地，第一泄压件311f仍设有贯通的安装孔302f，该安装孔302f的一端通向第一壁部，另一端朝向第二壁部。第二泄压件321f至少部分伸入上述安装孔302f，其设有贯通的连通孔304f，该连通孔304f的一端与安装孔302f连通，另一端通向第二壁部；同时，第二泄压件321f于连通孔304f的壁设有贯通的排气孔303f，上述第一泄压件311f的内壁封堵排气孔303d。泄压通道301f包括安装孔302f与连通孔304f；相应地，上述第一壁部于对应安装孔302f处设有泄压口，第二壁部于对应连通孔304f处亦设有泄压口。则，当电芯的温度高于预设温度时，壳体膨胀而致使第一壁部110f与第二壁部120f之间的间隙将变大，进而使第一泄压单元310f与第二泄压单元320f发生相对位移至排气孔303f的至少部分退出安装孔302f，从而使上述收容腔、连通孔304与安装孔302依次连通。收容腔101内产生的气体部分可依次通过上述排气孔303f、连通孔304f以及第二壁部上的泄压口逸出向电芯的外界，另一部分可依次通过上述排气孔303f、连通孔304、安装孔302f以及第一壁部上的泄压口逸出向电芯的外界。Next, please refer to FIG. 8 , in combination with other drawings, the pressure relief assembly 300f still includes a first pressure relief unit 310f and a second pressure relief unit 320f; the first pressure relief unit 310f includes a first pressure relief member 311f, The second pressure relief unit 320f includes a second pressure relief member 321f. The pressure relief assembly 300f is basically the same as the pressure relief assembly 300d in the above-mentioned embodiment, and the main difference between the two is that the outlet of the pressure relief passage 301d in the pressure relief assembly 300d leads to the first wall; The pressure relief passage 301f of the assembly 300f has double-sided outlets, at least one outlet of the pressure relief passage 301f leads to the first wall portion, and at least one outlet leads to the second wall portion. Specifically, the first pressure relief member 311f is still provided with a through mounting hole 302f, one end of the mounting hole 302f leads to the first wall portion, and the other end faces the second wall portion. The second pressure relief member 321f at least partially extends into the above-mentioned installation hole 302f, and is provided with a through communication hole 304f, one end of the communication hole 304f is communicated with the installation hole 302f, and the other end is connected to the second wall; The pressure piece 321f is provided with an exhaust hole 303f passing through the wall of the communication hole 304f, and the inner wall of the first pressure relief piece 311f blocks the exhaust hole 303d. The pressure relief passage 301f includes a mounting hole 302f and a communication hole 304f; correspondingly, the first wall portion is provided with a pressure relief port corresponding to the mounting hole 302f, and the second wall portion is also provided with a pressure relief port corresponding to the communication hole 304f. Then, when the temperature of the battery cell is higher than the preset temperature, the casing expands, so that the gap between the first wall portion 110f and the second wall portion 120f will become larger, thereby causing the first pressure relief unit 310f and the second pressure relief unit 310f and the second pressure relief unit 310f to become larger. The pressure unit 320f is relatively displaced until at least part of the exhaust hole 303f exits the installation hole 302f, so that the above-mentioned receiving cavity, the communication hole 304 and the installation hole 302 are communicated in sequence. Part of the gas generated in the accommodating cavity 101 can escape to the outside of the battery cell through the above-mentioned exhaust hole 303f, the communication hole 304f and the pressure relief opening on the second wall in sequence, and the other part can pass through the above-mentioned exhaust hole 303f, communicate with The hole 304 , the installation hole 302f and the pressure relief opening on the first wall part escape to the outside of the cell.

还应当理解，即使前述各实施例中的泄压组件均是通过设置排气孔，且使得收容腔与泄压通道中的一个与排气孔的一端连通，第一泄压单元的内壁和所述第二泄压单元的外壁配合以封堵该排气孔的另一端，以实现泄压通道在电芯正常时与收容腔隔绝，而在电芯热失控时与收容腔连通的目的，但本申请仍不局限于此，在本申请其他的实施例中，泄压组件还可以不设置排气孔，而是通过使第二泄压件在电芯温度高于预设阈值时退出安装孔，达到上述目的。其中，泄压通道的设置方式可参阅上述各实施例。例如，在一些实施例中，泄压通孔包括安装孔；该安装孔贯通第一泄压件，且一端通向第一壁部；相应地，上述第一壁部于对应安装孔处设有与该安装孔连通的泄压口。又例如，在另一些实施例中，泄压通道包括贯通第二泄压件设置的连通孔；该连通孔的一端与安装孔连通，另一端通向第二壁部；相应地，上述第二壁部于对应连通孔处设有泄压口。还例如，泄压通道同时包括贯通第一泄压件的安装孔以及贯通第二泄压件设置的连通孔；安装孔的一端通向第一壁部，连通孔的一端与安装孔连通，另一端通向第二壁部；相应地，上述第一壁部于对应安装孔处设有与该安装孔连通的泄压口，上述第二壁部于对应连通孔处设有泄压口。It should also be understood that even though the pressure relief components in the foregoing embodiments are provided with an exhaust hole, and one of the receiving cavity and the pressure relief channel is communicated with one end of the exhaust hole, the inner wall of the first pressure relief unit and all of the exhaust holes are connected. The outer wall of the second pressure relief unit cooperates to block the other end of the exhaust hole, so as to realize the purpose that the pressure relief channel is isolated from the accommodating cavity when the battery core is normal, and communicated with the accommodating cavity when the battery core is thermally out of control. The present application is still not limited to this. In other embodiments of the present application, the pressure relief component may not be provided with a vent hole, but the second pressure relief element can be withdrawn from the mounting hole when the temperature of the battery core is higher than a preset threshold. , to achieve the above purpose. The arrangement of the pressure relief channel may refer to the above embodiments. For example, in some embodiments, the pressure relief through hole includes a mounting hole; the mounting hole passes through the first pressure relief member, and one end leads to the first wall portion; correspondingly, the first wall portion is provided with a corresponding mounting hole. A pressure relief port that communicates with the mounting hole. For another example, in other embodiments, the pressure relief channel includes a communication hole provided through the second pressure relief member; one end of the communication hole is communicated with the mounting hole, and the other end is connected to the second wall portion; correspondingly, the above-mentioned second The wall portion is provided with a pressure relief port at the corresponding communication hole. For another example, the pressure relief passage also includes an installation hole penetrating the first pressure relief piece and a communication hole provided through the second pressure relief piece; one end of the installation hole leads to the first wall portion, one end of the communication hole is communicated with the installation hole, and the other end is in communication with the installation hole. One end leads to the second wall portion; correspondingly, the first wall portion is provided with a pressure relief port in communication with the mounting hole at the corresponding mounting hole, and the second wall portion is provided with a pressure relief port at the corresponding communication hole.

进一步地，为提升第一泄压单元与第二泄压单元之间的密封性能，从而降低在电芯处于正常状态时，收容腔内的电解液经由第一泄压件与第二泄压件之间的微小缝隙向外渗出的隐患，该第一泄压单元还包括同轴固定于安装孔内壁且具有弹性的第一密封圈。具体地，第一密封圈呈筒状结构，其固定于安装孔的内壁；上述第二泄压单元伸入该第一密封圈的内孔，且该第二泄压单元的外壁与第一密封圈过盈配合。第一密封圈的设置可应用于上述提及的任一实施方式的泄压组件，当然，第一密封圈的具体设置方式会根据第一泄压件与第二泄压件的具体形状而有所不同。例如，结合图3至图5，对于第一泄压件设有排气孔的泄压组件而言，第一泄压件于第一密封圈覆盖的区域设有上述排气孔，相应地，第一密封圈于对应该排气孔处设有过孔；上述第二泄压单元与第一密封圈过盈配合，且第二泄压单元的外壁封堵该过孔，进而封堵上述排气孔。又例如，请结合图6至图8，对于第二泄压件设有排气孔的泄压组件而言，该第一密封圈与第二泄压单元过盈配合，并封堵上述排气孔。Further, in order to improve the sealing performance between the first pressure relief unit and the second pressure relief unit, so as to reduce when the battery cell is in a normal state, the electrolyte in the receiving cavity passes through the first pressure relief member and the second pressure relief member. In order to avoid the hidden danger of leakage from the tiny gap between them, the first pressure relief unit also includes an elastic first sealing ring that is coaxially fixed on the inner wall of the installation hole. Specifically, the first sealing ring has a cylindrical structure and is fixed on the inner wall of the installation hole; the second pressure relief unit extends into the inner hole of the first sealing ring, and the outer wall of the second pressure relief unit is sealed with the first seal Ring interference fit. The arrangement of the first sealing ring can be applied to the pressure relief assembly of any of the above-mentioned embodiments. Of course, the specific arrangement of the first sealing ring will vary according to the specific shapes of the first pressure relief piece and the second pressure relief piece. different. For example, referring to FIGS. 3 to 5 , for the pressure relief assembly in which the first pressure relief member is provided with a vent hole, the first pressure relief member is provided with the above-mentioned vent hole in the area covered by the first sealing ring, and accordingly, The first sealing ring is provided with a via hole corresponding to the exhaust hole; the second pressure relief unit is in an interference fit with the first sealing ring, and the outer wall of the second pressure relief unit blocks the via hole, thereby blocking the above-mentioned exhaust gas stomata. For another example, referring to FIG. 6 to FIG. 8 , for a pressure relief assembly with a vent hole on the second pressure relief member, the first sealing ring is in an interference fit with the second pressure relief unit, and blocks the above-mentioned exhaust gas. hole.

进一步地，为提升第一泄压单元与第二泄压单元之间的密封性能，从而降低在电芯处于正常状态时，收容腔内的电解液经由第一泄压件与第二泄压件之间的微小缝隙向外渗出的隐患，该第一泄压单元还包括过盈地套设于第二泄压件且具有弹性的第二密封圈。具体地，第二密封圈呈筒状结构，其固定于第二泄压件的外壁；第二密封圈伸入上述安装孔，并与第一泄压单元的内壁过盈配合。第二密封圈的设置可应用于上述提及的任一实施方式的泄压组件，当然，第二密封圈的具体设置方式会根据第二泄压件与第二泄压件的具体形状而有所不同。例如，结合图3至图5，对于第一泄压件设有排气孔的泄压组件而言，第二密封圈与第一泄压单元的内壁过盈配合，并封堵上述排气孔。又例如，请结合图6至图8，对于第二泄压件设有排气孔的泄压组件而言，第二泄压件于第二密封圈覆盖的区域设有上述排气孔，相应地，第二密封圈于对应该排气孔处设有过孔；上述第一泄压单元与第二密封圈过盈配合，且第一泄压单元的内壁封堵该过孔，进而封堵上述排气孔。Further, in order to improve the sealing performance between the first pressure relief unit and the second pressure relief unit, so as to reduce when the battery cell is in a normal state, the electrolyte in the receiving cavity passes through the first pressure relief member and the second pressure relief member. In order to avoid the hidden danger of leakage from the tiny gap between them, the first pressure relief unit further includes an elastic second sealing ring which is sleeved on the second pressure relief piece with an interference fit. Specifically, the second sealing ring has a cylindrical structure and is fixed on the outer wall of the second pressure relief member; the second sealing ring extends into the above-mentioned mounting hole and is in interference fit with the inner wall of the first pressure relief unit. The arrangement of the second sealing ring can be applied to the pressure relief assembly of any of the above-mentioned embodiments. Of course, the specific arrangement of the second sealing ring will vary according to the specific shapes of the second pressure relief piece and the second pressure relief piece. different. For example, referring to FIG. 3 to FIG. 5 , for the pressure relief assembly in which the first pressure relief member is provided with an exhaust hole, the second sealing ring is in an interference fit with the inner wall of the first pressure relief unit, and blocks the above-mentioned exhaust hole. . For another example, referring to FIG. 6 to FIG. 8 , for the pressure relief assembly in which the second pressure relief member is provided with an exhaust hole, the second pressure relief member is provided with the above-mentioned exhaust hole in the area covered by the second sealing ring, corresponding to The second sealing ring is provided with a via hole corresponding to the exhaust hole; the above-mentioned first pressure relief unit and the second sealing ring are in interference fit, and the inner wall of the first pressure relief unit blocks the via hole, thereby blocking the above vent holes.

综上所述，本申请实施例提供的该电芯1包括壳体100、电极组件200以及泄压组件300。其中，壳体100设有收容腔101，该壳体100包括相对设置的第一壁部110与第二壁部120。泄压组件300收容于上述收容腔101，其包括第一泄压单元310与第二泄压单元320。第一泄压单元310包括第一泄压件311，该第一泄压件311固定于上述第一壁部110；第一泄压件311朝向第二壁部120的一端设有安装孔302。第二泄压单元320包括第二泄压件321，该第二泄压件321固定于上述第二壁部120；第二泄压件321的至少部分伸入上述安装孔302，且第二泄压单元320的外壁与第一泄压单元310的内壁之间密封。泄压组件300设有与上述收容腔101隔绝的泄压通道301，壳体100设有分别连通泄压通道301与电芯1的外部环境的泄压口102。上述第一泄压单元310与第二泄压单元320用于共同配合，以在电芯1的温度高于预设阈值时，随壳体的膨胀而发生相对位移至泄压通道301与收容腔101连通。To sum up, the battery cell 1 provided in this embodiment of the present application includes a casing 100 , an electrode assembly 200 and a pressure relief assembly 300 . The housing 100 is provided with a receiving cavity 101 , and the housing 100 includes a first wall portion 110 and a second wall portion 120 that are oppositely disposed. The pressure relief assembly 300 is accommodated in the above-mentioned accommodating cavity 101 , and includes a first pressure relief unit 310 and a second pressure relief unit 320 . The first pressure relief unit 310 includes a first pressure relief member 311 , and the first pressure relief member 311 is fixed on the first wall portion 110 ; an end of the first pressure relief member 311 facing the second wall portion 120 is provided with a mounting hole 302 . The second pressure relief unit 320 includes a second pressure relief member 321, the second pressure relief member 321 is fixed on the second wall portion 120; The outer wall of the pressure unit 320 and the inner wall of the first pressure relief unit 310 are sealed. The pressure relief assembly 300 is provided with a pressure relief channel 301 isolated from the above-mentioned accommodating cavity 101 , and the housing 100 is provided with a pressure relief port 102 respectively communicating with the pressure relief channel 301 and the external environment of the battery cell 1 . The above-mentioned first pressure relief unit 310 and the second pressure relief unit 320 are used to cooperate together, so that when the temperature of the battery cell 1 is higher than the preset threshold, relative displacement occurs to the pressure relief channel 301 and the receiving cavity with the expansion of the casing. 101 Connected.

与目前市场上的电芯相比，本申请实施例提供的电芯设置有泄压通道301；在电芯1温度高于预设阈值时，壳体100发生膨胀；相应地，第一泄压单元310与第二泄压单元320之间相对位移至，上述泄压通道301与壳体100内的收容腔101连通，从而可将电芯1内的气体排出至外界，平衡电芯的内外气压，以降低电芯***的安全隐患。Compared with the batteries currently on the market, the batteries provided in the embodiments of the present application are provided with pressure relief channels 301; when the temperature of the batteries 1 is higher than the preset threshold, the casing 100 expands; accordingly, the first pressure relief The relative displacement between the unit 310 and the second pressure relief unit 320 is such that the pressure relief channel 301 communicates with the receiving cavity 101 in the housing 100, so that the gas in the battery cell 1 can be discharged to the outside, and the internal and external air pressure of the battery cell can be balanced. , in order to reduce the safety hazard of cell explosion.

值得补充说明的是，上述泄压通道(即上述安装孔和/或连通孔)除可用于在电芯1热失控时排出电芯内的气体，以平衡压强之外，还能够增大电芯1与空气接触的面积，使电芯1的散热能力得到有效提升。故在满足能够实现防爆功能的条件下，应尽量增大泄压通道内壁可接触空气的面积。当安装孔302贯通第一泄压件时，第二泄压件的自由端优选靠近第一泄压件的自由端设置，从而尽可能增大第一泄压单元的内壁与空气的接触面积。本实施例中，沿上述预设方向X，第二泄压单元伸入安装孔的长度与安装孔沿预设方向的长度之比小于四分之一。It is worth adding that the above-mentioned pressure relief channel (that is, the above-mentioned mounting hole and/or communication hole) can be used to discharge the gas in the battery cell when the battery cell 1 is thermally out of control, so as to balance the pressure, and can also increase the battery cell. 1 The area in contact with the air effectively improves the heat dissipation capacity of the battery cell 1. Therefore, under the condition that the explosion-proof function can be realized, the area of the inner wall of the pressure relief channel that can contact the air should be increased as much as possible. When the mounting hole 302 penetrates the first pressure relief piece, the free end of the second pressure relief piece is preferably disposed close to the free end of the first pressure relief piece, so as to maximize the contact area between the inner wall of the first pressure relief unit and the air. In this embodiment, along the predetermined direction X, the ratio of the length of the second pressure relief unit extending into the installation hole to the length of the installation hole along the predetermined direction is less than one quarter.

基于同一发明构思，本申请还提供一种用电装置。请参阅图9，其示出本申请其中一实施例提供的用电装置2的示意图，该用电装置包括上述任一实施例中的电芯1，以及由该电芯进行供电的负载结构。本实施例中，该用电装置2包括手机；可以理解的是，在本申请的其他实施例中，用电装置还可以是平板电脑、电脑、无人机等其他由电力驱动的装置。Based on the same inventive concept, the present application also provides an electrical device. Please refer to FIG. 9 , which shows a schematic diagram of an electrical device 2 provided by one of the embodiments of the present application. The electrical device includes the battery 1 in any of the above embodiments, and a load structure powered by the battery. In this embodiment, the electrical device 2 includes a mobile phone; it can be understood that, in other embodiments of the present application, the electrical device may also be a tablet computer, a computer, a drone, or other devices driven by electricity.

最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；在本申请的思路下，以上实施例或者不同实施例中的技术特征之间也可以进行组合，步骤可以以任意顺序实现，并存在如上所述的本申请的不同方面的许多其它变化，为了简明，它们没有在细节中提供；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; under the thinking of the present application, the technical features in the above embodiments or different embodiments can also be combined, The steps may be carried out in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been The skilled person should understand that it is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the implementation of the application. scope of technical solutions.

Claims

一种电芯，包括壳体与电极组件，所述壳体设有收容腔，所述壳体包括相对设置的第一壁部与第二壁部，所述电极组件收容于所述收容腔，其特征在于，所述电芯还包括收容于所述收容腔的泄压组件，所述泄压组件包括：An electric core includes a casing and an electrode assembly, the casing is provided with a accommodating cavity, the casing includes a first wall portion and a second wall portion that are arranged oppositely, and the electrode assembly is accommodated in the accommodating cavity, It is characterized in that, the battery core further includes a pressure relief assembly accommodated in the receiving cavity, and the pressure relief assembly includes:

第一泄压单元，包括第一泄压件，所述第一泄压件固定于所述第一壁部，所述第一泄压件朝向所述第二壁部的一端设有安装孔；以及The first pressure relief unit includes a first pressure relief piece, the first pressure relief piece is fixed on the first wall portion, and an end of the first pressure relief piece facing the second wall portion is provided with a mounting hole; as well as

第二泄压单元，包括第二泄压件，所述第二泄压件固定于所述第二壁部，所述第二泄压件至少部分伸入所述安装孔，所述第二泄压单元的外壁与所述第一泄压单元的内壁之间密封；The second pressure relief unit includes a second pressure relief piece, the second pressure relief piece is fixed on the second wall portion, the second pressure relief piece at least partially protrudes into the installation hole, the second pressure relief piece sealing between the outer wall of the pressure unit and the inner wall of the first pressure relief unit;

所述泄压组件设有与所述收容腔隔绝的泄压通道，所述壳体设有连通所述泄压通道与所述电芯的外部环境的至少一泄压口；The pressure relief assembly is provided with a pressure relief channel isolated from the accommodating cavity, and the housing is provided with at least one pressure relief port connecting the pressure relief channel and the external environment of the battery cell;

所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述泄压通道与所述收容腔连通。The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery cell is higher than a preset threshold value, relative displacement occurs to the pressure relief with the expansion of the casing. The pressure channel is communicated with the receiving cavity.
根据权利要求1所述的电芯，其特征在于，所述第一泄压件或所述第二泄压件的壁设有贯通的排气孔，所述收容腔与所述泄压通道中的一个与所述排气孔的一端连通，所述第一泄压单元的内壁和所述第二泄压单元的外壁配合以封堵所述排气孔的另一端；The battery cell according to claim 1, wherein a wall of the first pressure relief member or the second pressure relief member is provided with a through exhaust hole, and the accommodating cavity is located in the pressure relief channel. One of the vents is communicated with one end of the exhaust hole, and the inner wall of the first pressure relief unit and the outer wall of the second pressure relief unit cooperate to block the other end of the exhaust hole;

所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述排气孔分别连通所述收容腔与所述泄压通道。The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery cell is higher than a preset threshold value, relative displacement occurs to the exhaust gas with the expansion of the casing. The air holes are respectively connected to the receiving cavity and the pressure relief channel.
根据权利要求2所述的电芯，其特征在于，所述第一泄压件于所述安装孔的壁设有与所述收容腔连通的所述排气孔，所述第二泄压单元的外壁封堵所述排气孔；The battery cell according to claim 2, wherein the first pressure relief member is provided with the air outlet on the wall of the mounting hole, which is communicated with the receiving cavity, and the second pressure relief unit The outer wall blocks the vent hole;

所述泄压通道包括所述安装孔，所述安装孔贯通所述第一泄压件且一端通向所述第一壁部，所述第一壁部于对应所述安装孔处设有所述泄压口；和/或，The pressure relief channel includes the installation hole, the installation hole penetrates the first pressure relief piece and has one end leading to the first wall portion, and the first wall portion is provided with a position corresponding to the installation hole. said pressure relief port; and/or,

所述泄压通道包括贯通所述第二泄压件的连通孔，所述连通孔的一端连通所述安装孔，另一端通向所述第二壁部，所述第二壁部于对应所述连通孔处设有所述泄压口；The pressure relief passage includes a communication hole passing through the second pressure relief member, one end of the communication hole is connected to the mounting hole, and the other end is connected to the second wall portion, the second wall portion is connected to the corresponding The pressure relief port is provided at the communication hole;

所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述第二泄压单元打开所述排气孔的至少部分。The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery core is higher than a preset threshold value, relative displacement occurs to the first pressure relief unit with the expansion of the casing. Two pressure relief units open at least part of the vent hole.
根据权利要求3所述的电芯，其特征在于，所述第一泄压单元还包括同轴固定于所述安装孔的内壁的第一密封圈；The battery cell according to claim 3, wherein the first pressure relief unit further comprises a first sealing ring coaxially fixed to the inner wall of the installation hole;

所述第一泄压件于所述第一密封圈覆盖的区域设有所述排气孔，所述第一密封圈于对应所述排气孔处设有过孔，所述第二泄压单元与所述第一密封圈过盈配合，所述第二泄压单元的外壁封堵所述过孔。The first pressure relief member is provided with the exhaust hole in the area covered by the first sealing ring, the first sealing ring is provided with a via hole corresponding to the exhaust hole, and the second pressure relief The unit is in interference fit with the first sealing ring, and the outer wall of the second pressure relief unit blocks the via hole.
根据权利要求3所述的电芯，其特征在于，所述第二泄压单元还包括过盈地套设于所述第二泄压件的第二密封圈；The battery cell according to claim 3, wherein the second pressure relief unit further comprises a second sealing ring that is sleeved on the second pressure relief member with an interference fit;

所述第二密封圈与所述第一泄压单元过盈配合并封堵所述排气孔。The second sealing ring is in interference fit with the first pressure relief unit and blocks the exhaust hole.
根据权利要求2所述的电芯，其特征在于，所述第二泄压件设有连通孔，所述第二泄压件于所述连通孔的壁设有贯通的所述排气孔，所述第一泄压单元的内壁封堵所述排气孔；The battery cell according to claim 2, wherein the second pressure relief member is provided with a communication hole, and the second pressure relief member is provided with the exhaust hole passing through the wall of the communication hole, The inner wall of the first pressure relief unit blocks the exhaust hole;

所述泄压通道包括所述连通孔，所述连通孔的一端贯通所述第二泄压件并通向所述第二壁部，所述第二壁部于对应所述连通孔处设有所述泄压口；和/或，The pressure relief channel includes the communication hole, and one end of the communication hole penetrates the second pressure relief member and leads to the second wall portion, and the second wall portion is provided with a corresponding to the communication hole. the pressure relief port; and/or,

所述泄压通道包括所述安装孔，所述连通孔的一端与所述安装孔连通，所述安装孔贯通所述第一泄压件且一端通向所述第一壁部，所述第一壁部于对应所述连通孔处设有所述泄压口；The pressure relief channel includes the installation hole, one end of the communication hole communicates with the installation hole, the installation hole penetrates the first pressure relief member and one end leads to the first wall portion, the first A wall portion is provided with the pressure relief port corresponding to the communication hole;

所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述排气孔至少部分退出所述安装孔。The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery cell is higher than a preset threshold value, relative displacement occurs to the exhaust gas with the expansion of the casing. The air hole at least partially exits the mounting hole.
根据权利要求6所述的电芯，其特征在于，所述第一泄压单元还包括同轴固定于所述安装孔的内壁的第一密封圈；The battery cell according to claim 6, wherein the first pressure relief unit further comprises a first sealing ring coaxially fixed to the inner wall of the installation hole;

所述第一密封圈与所述第二泄压单元过盈配合，并封堵所述排气孔。The first sealing ring is in interference fit with the second pressure relief unit, and blocks the exhaust hole.
根据权利要求6所述的电芯，其特征在于，所述第二泄压单元还包括过盈地套设于所述第二泄压件的第二密封圈；The battery cell according to claim 6, wherein the second pressure relief unit further comprises a second sealing ring interferingly sleeved on the second pressure relief member;

所述第二泄压件于所述第二密封圈覆盖的区域设有所述排气孔，所述第二密封圈于对应所述排气孔处设有过孔；The second pressure relief member is provided with the exhaust hole in the area covered by the second sealing ring, and the second sealing ring is provided with a through hole corresponding to the exhaust hole;

所述第一泄压单元与所述第二密封圈过盈配合，且所述第一泄压单元的内壁封堵所述过孔。The first pressure relief unit is in interference fit with the second sealing ring, and the inner wall of the first pressure relief unit blocks the via hole.
根据权利要求1所述的电芯，其特征在于，所述泄压通道包括安装孔，所述安装孔贯通所述第一泄压件且一端通向所述第一壁部，所述第一壁部于对应所述安装孔处设有所述泄压口；和/或，The battery cell according to claim 1, wherein the pressure relief channel comprises a mounting hole, the mounting hole penetrates the first pressure relief member and one end leads to the first wall portion, and the first The wall portion is provided with the pressure relief port corresponding to the mounting hole; and/or,

所述泄压通道包括贯通所述第二泄压件的连通孔，所述连通孔的一端与所述安装孔连通，另一端通向所述第二壁部，所述第二壁部于对应所述连通孔处设有所述泄压口；The pressure relief passage includes a communication hole passing through the second pressure relief piece, one end of the communication hole is communicated with the mounting hole, and the other end is connected to the second wall portion, the second wall portion is corresponding to the The pressure relief port is provided at the communication hole;

所述第一泄压单元与所述第二泄压单元用于共同配合，以在所述电芯的温度高于预设阈值时，随所述壳体的膨胀而发生相对位移至所述第二泄压件退出所述安装孔。The first pressure relief unit and the second pressure relief unit are used to cooperate together, so that when the temperature of the battery core is higher than a preset threshold value, relative displacement occurs to the first pressure relief unit with the expansion of the casing. The second pressure relief piece exits the mounting hole.
根据权利要求1所述的电芯，其特征在于，The battery according to claim 1, wherein,

所述第一泄压单元还包括同轴固定于所述安装孔的内壁的第一密封圈，所述第二泄压单元与所述第一密封圈过盈配合；和/或，The first pressure relief unit further includes a first sealing ring that is coaxially fixed to the inner wall of the installation hole, and the second pressure relief unit is in an interference fit with the first sealing ring; and/or,

所述第二泄压单元还包括过盈地套设于所述第二泄压件的第二密封圈，所述第二密封圈与所述第一泄压单元过盈配合。The second pressure relief unit further includes a second sealing ring sleeved on the second pressure relief member in an interference fit, and the second sealing ring is in an interference fit with the first pressure relief unit.
根据权利要求1至10中任一项所述的电芯，其特征在于，所述壳体还包括连接壁；The battery cell according to any one of claims 1 to 10, wherein the housing further comprises a connecting wall;

所述连接壁连接所述第一壁部与所述第二壁部，所述第一壁部、所述第二壁部与所述连接壁共同围成所述收容腔。The connecting wall connects the first wall portion and the second wall portion, and the first wall portion, the second wall portion and the connecting wall together form the receiving cavity.
一种用电装置，其特征在于，包括如权利要求1至11中任一项所述的电芯。An electrical device, characterized in that it comprises the battery cell according to any one of claims 1 to 11 .