CN220753674U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The application relates to the technical field of batteries and discloses a battery monomer, a battery and an electric device, wherein the battery monomer comprises a shell, an end cover, an electrode assembly and an insulating protection piece, the shell is provided with an opening, the end cover is covered on the opening, a pressure relief structure is arranged on the end cover, the electrode assembly is arranged in the shell, the insulating protection piece is arranged on one side of the end cover facing the electrode assembly, the insulating protection piece comprises a body and a bulge structure, the body is provided with an exhaust port, and the bulge structure and the pressure relief structure are oppositely arranged on two sides of the exhaust port; the protruding structure is provided with the hollow tank, and protruding structure includes diapire and lateral wall, diapire and pressure release structure are relative and with electrode assembly butt, and the diapire is enclosed construction, and the lateral wall is connected between diapire and body, is provided with at least one intercommunication mouth on the lateral wall, and the intercommunication mouth passes through hollow tank and gas vent intercommunication. The bottom wall is arranged to be a closed structure, so that the possibility that electrolyte or air flow in the battery unit impacts the pressure release structure in the front is reduced, and the possibility of electrolyte leakage is reduced.

Description

Battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device.

Background

This section provides only background information related to the present application and is not necessarily prior art.

The battery can store electric energy, and can be widely used for electronic equipment such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like.

When the battery falls or vibrates, the battery has damage risks such as electrolyte leakage and the like due to higher impact force. How to improve the impact resistance of the battery and reduce the risk of the battery being damaged by impact is a non-negligible problem in the process of battery technology development.

Disclosure of Invention

In view of the above, the present application provides a battery cell, a battery and an electric device, so as to reduce the impact of the electrolyte on the pressure release structure, improve the impact resistance of the battery, and reduce the leakage risk of the electrolyte.

The first aspect of this application proposes a battery monomer, including casing, end cover, electrode assembly and insulating protection piece, the casing have the opening, the end cover lid close in the opening, be provided with relief structure on the end cover, electrode assembly set up in the casing, insulating protection piece is located the end cover is towards one side of electrode assembly, insulating protection piece includes body and protruding structure, the body is equipped with the gas vent, protruding structure with the relief structure all with the position of gas vent corresponds the setting, just protruding structure set up in the body deviates from one side of relief structure. The utility model discloses a relief structure, including protruding structure, relief structure, body, the protruding structure is provided with the hollow tank, protruding structure includes diapire and lateral wall, the diapire with the relief structure sets up relatively, the diapire is enclosed construction, the lateral wall is connected the diapire with between the body, be provided with at least one intercommunication mouth on the lateral wall, the intercommunication mouth passes through the hollow tank with the gas vent intercommunication.

In the technical scheme of this application embodiment, set up the intercommunication mouth on protruding structure's the lateral wall, when the battery monomer took place thermal runaway, the discharge in the battery monomer can be through intercommunication mouth flow direction hollow tank, then through gas vent flow direction pressure release structure. The bottom wall of the bulge structure is set to be a closed structure, when electrolyte or air flow impacts to the end cover side due to falling or vibration of the battery monomer, the electrolyte or the air flow impacts the bottom wall firstly and then flows to the side along the bottom wall, so that the possibility that the electrolyte or the air flow directly impacts the pressure release structure in the front is reduced, the possibility that the pressure release structure is opened due to falling or vibration of the battery monomer to enable the electrolyte to leak is reduced, and the shock resistance of the battery monomer is improved.

In some embodiments of the present application, the side wall includes a first side portion and a second side portion, where the first side portion and the second side portion are disposed opposite to each other and are disposed on two sides of the hollow groove, and the communication ports are disposed on the first side portion and the second side portion. Through set up the intercommunication mouth respectively on the relative both sides of cavity groove, when the battery monomer takes place thermal runaway, can make the discharge in the battery monomer get into the cavity groove through the both sides of cavity groove, make the discharge can disperse the flow, improved the discharge convenience of discharge. And when the battery monomer or vibrates, electrolyte or air flow in the shell can flow in a dispersed way, and the electrolyte and the air flow can form a loop between the communication port of the first side part and the communication port of the second side part, and the loop is approximately parallel to the bottom surface of the pressure relief structure, so that the impact of the electrolyte or the air flow on the pressure relief structure can be further reduced, and the possibility of leakage of the electrolyte when the battery monomer or the vibration is reduced.

In some embodiments of the present application, a plurality of communication ports are arranged on the first side at intervals; and/or a plurality of communication ports are arranged on the second side part at intervals. Through setting up a plurality of communication openings on first lateral part and/or second lateral part, when battery monomer falls or vibrates, can carry out the reposition of redundant personnel with the electrolyte, reduce the impact effect of electrolyte. And, a plurality of intercommunications are put at intervals, and the part of lateral wall between two adjacent intercommunications can play the supporting role for first lateral part or second lateral part still have better intensity, can effectively support electrode assembly's terminal surface.

In some embodiments of the present application, the first side portion and/or the second side portion are provided with reinforcing ribs, both sides of the reinforcing ribs are provided with the communication ports, and a width L1 of the reinforcing ribs is 2 mm to 5 mm. The strengthening rib is between two adjacent intercommunication mouths, and it can play the supporting role for the lateral wall has better intensity, and the lateral wall can effectively support electrode assembly's terminal surface.

In some embodiments of the present application, the total flow area of all the communication ports is greater than the relief area of the relief structure. The total communication area of all the communication ports is larger than the pressure relief area of the pressure relief structure, so that when the battery unit is out of control, the discharge in the battery unit can smoothly flow to the pressure relief structure through the communication ports, the flow limiting effect of the communication ports on the discharge is reduced, and the effective discharge of the discharge is maintained.

In some embodiments of the present application, the total flow area of all of the communication ports is greater than or equal to 1.2 times the relief area of the relief structure.

In some embodiments of the present application, the relief structure has a relief area, and a projection of the relief area to the bottom wall is located in the hollow groove. The pressure release area can be well shielded by the bottom wall, so that the possibility that electrolyte or air flow in the battery unit directly impacts the pressure release area is reduced; meanwhile, when the battery monomer is in thermal runaway, the discharged matter entering the hollow groove can flow to the pressure relief area more smoothly and flow out of the pressure relief area, so that the thermal runaway protection effect of the battery monomer is improved.

In some embodiments of the present application, a maximum dimension L2 of the hollow groove is greater than or equal to 1.2 times a maximum dimension W1 of the pressure relief zone along the first direction, and the first direction is a length direction of the first side portion. Thus, the length dimension of the first side part corresponding to the hollow groove and the length dimension of the second side part corresponding to the hollow groove are larger, which is beneficial to arranging more communication ports, so that the total flow area of all the communication ports is increased.

In some embodiments of the present application, a maximum dimension L3 of the hollow groove is greater than or equal to 1.2 times a maximum dimension W2 of the pressure relief zone along the second direction, the second direction being a direction in which the first side portion faces the second side portion. The size of the hollow groove is limited to the size of the bottom wall, the size of the hollow groove is larger, the buffer effect of the bottom wall on electrolyte or air flow can be improved, the possibility that the electrolyte or air flow impacts the bottom wall to deform the bottom wall to impact the pressure release structure is reduced, and the stability of the pressure release structure when the battery monomer falls or vibrates is improved.

In some embodiments of the present application, the body is integral with the raised structure.

In some embodiments of the present application, the body and the protruding structure are plastic parts.

In some embodiments of the present application, the bottom wall abuts the electrode assembly. The bottom wall is abutted with the electrode assembly to limit the electrode assembly, so that the possibility of vibration or shaking of the electrode assembly in the shell is reduced.

In some embodiments of the present application, the side wall further includes a third side portion and a fourth side portion, the third side portion and the fourth side portion are both connected between the first side portion and the second side portion, and the third side portion and the fourth side portion are disposed opposite to each other at two ends of the hollow groove, and the third side portion and/or the fourth side portion are of a closed structure.

In some embodiments of the present application, the opposite ends of the body are further provided with protrusions, the protrusions are connected to one side of the body facing the electrode assembly, the protrusions are abutted to the electrode assembly, and the protrusions are disposed at intervals with the protrusion structures. The protruding part can support the body and can be abutted with the electrode assembly so as to increase the fixing effect on the electrode assembly and reduce the possibility of vibration or shaking of the electrode assembly in the shell.

A second aspect of the present application contemplates a battery comprising a battery cell as set forth in the present application or any embodiment of the present application.

A third aspect of the present application proposes an electrical device comprising a battery according to the present application or any embodiment of the present application, said battery being adapted to provide electrical energy.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 schematically illustrates a schematic structural view of a vehicle provided in some embodiments of the present application;

fig. 2 schematically illustrates an exploded view of a battery provided in some embodiments of the present application;

Fig. 3 schematically illustrates an exploded structural view of a battery cell provided in some embodiments of the present application;

FIG. 4 schematically illustrates an assembled block diagram of an end cap and insulation protector of some embodiments of the present application;

FIG. 5 schematically illustrates an assembled side view of an end cap and insulation protector of some embodiments of the present application;

FIG. 6 schematically illustrates a split schematic of an end cap and insulation protector of some embodiments of the present application;

fig. 7 schematically shows an enlarged view of the portion a of fig. 6.

Reference numerals in the specific embodiments are as follows:

1000. a vehicle;

100. a battery; 10. a case; 11. a first portion; 12. a second portion; 20. a battery cell; 21. an end cap; 211. an electrode terminal; 212. a pressure relief structure; 213. the pressure relief area; 22. a housing; 23. an electrode assembly; 231. a tab; 232. a main body portion; 24. a connecting sheet; 25. an insulating sheet;

30. an insulating protector; 31. a body; 311. an exhaust port; 32. a bump structure; 321. a bottom wall; 322. a sidewall; 3221. a first side portion; 3222. a second side portion; 3223. a third side portion; 3224. a fourth side portion; 323. a communication port; 324. a hollow groove; 325. reinforcing ribs; 33. a protruding portion; 34. a hollow cavity; 35. a reinforcing plate;

200. A controller;

300. a motor;

x, a first direction; y, second direction.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

With the vigorous development of new energy industry, the large-capacity battery core has more and more capacity, and the performance requirement on the battery is also higher and higher. The impact resistance of a battery is an important performance of the battery, and the impact resistance of the battery is also tested in the production process of the battery so that the battery can meet the basic requirement of the impact resistance.

The battery generally comprises one or more battery cells, and a pressure relief structure can be arranged on an end cover of each battery cell so as to timely discharge emissions when the battery cells are out of control. In the test of the impact resistance of the battery such as falling, the problem that the battery is damaged due to the leakage of electrolyte and cannot meet the impact resistance requirement is found.

Further research finds that when the battery falls or vibrates, electrolyte in the battery can impact the shell, and under the conditions of falling and the like when the battery is inverted, the electrolyte can impact the pressure relief structure, the pressure relief structure is a weak position of the battery shell, compared with other positions of the shell, the impact resistance of the pressure relief structure is weaker, the pressure relief structure is more easily impacted by the electrolyte to be opened, and the electrolyte is leaked to damage the battery.

Based on this, in order to alleviate battery fall or when vibrating, battery shock resistance is comparatively limited, the electrolyte leaks the problem easily, this application provides a battery monomer, and battery monomer corresponds the relief structure on insulating protection spare and is provided with protruding structure, and protruding structure's diapire is enclosed construction to set up the intercommunication mouth on protruding structure's lateral wall.

When the battery cell is out of control, the emission in the battery cell can flow to the pressure relief structure through the communication port on the side wall, so that the emission can be smoothly discharged to the outer side of the battery cell. When the battery monomer falls or vibrates, electrolyte or air flow impacts the bottom wall of the insulation protection piece firstly, and flows towards the two sides of the protruding structure under the action of the bottom wall stop, the electrolyte or air flow can form a flow loop at the connecting port, the flow loop is approximately parallel to the bottom surface of the pressure relief structure, the impact of the electrolyte to the front piston of the pressure relief structure is reduced, the pressure relief structure is opened under the impact of the electrolyte, the possibility of electrolyte leakage of the battery monomer is reduced, and the impact resistance of the battery monomer is improved.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. The power supply system with the battery cells, batteries and the like disclosed by the application can be used for forming the power utilization device, so that the battery cell and the battery life are beneficial to alleviating and automatically adjusting the expansion force deterioration of the battery, supplementing the consumption of electrolyte and improving the stability of the battery performance.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 schematically illustrates a schematic structural diagram of a vehicle according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 schematically illustrates an exploded view of a battery provided in some embodiments of the present application, and the battery 100 includes a case 10 and a battery cell 20, wherein the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 schematically illustrates an exploded structure of a battery cell according to some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, an insulating protector 30, a case 22, an electrode assembly 23, and other functional components.

The end cap 21 refers to a member that is covered at the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cover 21 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 21 is not easy to deform when being extruded and collided, so that the battery cell 20 can have higher structural strength, and the safety performance can be improved. The end cap 21 may be provided with a functional part such as an electrode terminal 211. The electrode terminals 211 may be used to be electrically connected with the electrode assembly 23 through the connection tabs 24 for outputting or inputting electric power of the battery cells 20. In some embodiments, the end cap 21 may further be provided with a pressure relief structure 212 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value, and the pressure relief structure 212 may particularly take the form of an explosion-proof valve, a gas valve, a pressure relief valve, a safety valve, or the like, and may particularly take the form of a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold value, the pressure relief structure 212 performs an action or a weak structure provided in the pressure relief structure 212 is broken, thereby forming an opening or channel through which the internal pressure of the battery cell 20 can be released. The material of the end cap 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The case 22 is an assembly for cooperating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to accommodate the electrode assembly 23, the electrolyte, and other components. The case 22 and the end cap 21 may be separate members, and an opening may be provided in the case 22, and the interior of the battery cell 20 may be formed by covering the opening with the end cap 21 at the opening. It is also possible to integrate the end cap 21 and the housing 22, but specifically, the end cap 21 and the housing 22 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then put into place with the housing 22. The housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application. An insulating sheet 25 may be further disposed in the case 22, and the insulating sheet 25 may be coated on the outer side of the electrode assembly 23 to isolate the electrode assembly 23 from the case 22.

The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The electrode assembly 23 includes a main body portion 232 and a tab 231, wherein the main body portion 232 mainly includes portions of the positive and negative electrode sheets having active materials, and the portions of the positive and negative electrode sheets having no active materials each constitute the tab 231. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive and negative electrode active materials react with the electrolyte, and the tab 231 may be connected to the electrode terminal 211 through the connection piece 24 to form a current loop.

The insulating protection member 30 is a member located between the end cap 21 and the electrode assembly 23, the insulating protection member 30 may be a plastic member, and the insulating protection member may be integrally formed by plastic or assembled by plastic members, and is made of an insulating material. The insulating protector may be a member made of other materials, such as a rubber member. The insulation protection member 30 mainly has two functions, namely, the insulation protection member can be used for isolating the electric connection part in the shell 22 and the end cover 21 so as to reduce the risk of short circuit, and the end face of the electrode assembly 23 is effectively supported, because the electrode assembly 23 is assembled in place in the shell and after the end cover 21 is welded, the internal winding core of the electrode assembly 23 is in a slightly pressed state, and the electrode assembly 23 can be in a vibrating environment in the loading use process, if the constraint of the electrode assembly 23 is insufficient, the service life of the winding core is easily influenced or short circuit occurs, so that the end face of the winding core needs to be effectively supported in the insulation protection member so as to reduce the possibility of up-and-down movement of the electrode assembly 23.

Referring to fig. 3, and further in conjunction with fig. 4-6, fig. 4 schematically illustrates an assembled structure of the end cap and the insulating protector of some embodiments of the present application, fig. 5 schematically illustrates an assembled side view of the end cap and the insulating protector of some embodiments of the present application, fig. 6 schematically illustrates a split schematic view of the end cap and the insulating protector of some embodiments of the present application, and the present application proposes a battery cell 20, including a case 22, an end cap 21, an electrode assembly 23, and an insulating protector 30, the case 22 having an opening, the end cap 21 covering the opening, and a pressure relief structure 212 provided on the end cap 21; the electrode assembly 23 is arranged in the shell 22, the insulating protection member 30 is arranged on one side of the end cover 21 facing the electrode assembly 23, the insulating protection member 30 comprises a body 31 and a protruding structure 32, the body 31 is provided with an exhaust port 311, the protruding structure 32 and the pressure release structure 212 are arranged corresponding to the position of the exhaust port 311, and the protruding structure 32 is arranged on one side of the body 31 deviating from the pressure release structure 212. The protruding structure 32 is provided with hollow groove 324, and protruding structure 32 includes diapire 321 and lateral wall 322, and diapire 321 sets up with pressure release structure 212 relatively, and diapire 321 is enclosed construction, and lateral wall 322 is connected between diapire 321 and body 31, is provided with at least one intercommunication mouth 323 on the lateral wall 322, and intercommunication mouth 323 communicates with gas vent 311 through hollow groove 324.

The insulating protector 30 may be fixed to the end cap 21 and located at a side of the end cap 21 adjacent to the electrode assembly 23. The side of the end cap 21 adjacent to the electrode assembly 23 is the inner side of the end cap 21, and is also the lower side of the end cap 21 when the battery cell 20 is placed in the forward direction (as shown in fig. 3, the state in which the end cap 21 is placed in the upper and lower cases 22 is placed in the forward direction). For convenience of description, the corresponding components are described below in a state in which the battery cell 20 is placed in the forward direction.

The body 31 and the protrusion structure 32 of the insulating protector 30 may be an integral structure, specifically, may be an injection-molded integral structure, or may be a structure integrally connected by means of adhesion or the like. The material of the body 31 and the bump structure 32 may be the same, and may be an insulating material, specifically, a plastic member.

The exhaust port 311 on the body 31 penetrates the side of the body 31 facing the end cap 21 and the side of the body 31 facing away from the end cap 21, that is, the exhaust port 311 penetrates the top and bottom surfaces of the body 31. The protrusion structure 32 and the pressure relief structure 212 are disposed at positions corresponding to the positions of the exhaust ports 311, and are disposed at two sides of the exhaust ports 311, and are opposite to each other through the exhaust ports 311. Since the end cap 21 is disposed on the top surface side of the insulating protector 30, the pressure release structure 212 on the end cap 21 is disposed on the top surface side (the side facing the end cap 21) of the body 31, and the corresponding projection structure 32 is disposed on the bottom surface side (the side facing away from the end cap 21) of the body 31. Specifically, the protrusion structure 32 may be disposed directly below the air outlet 311, and the pressure relief structure 212 may cover directly above the air outlet 311.

The side wall 322 is connected with the bottom wall 321, and forms a hollow groove 324 in cooperation with the bottom wall 321. The bottom wall 321 may abut against the electrode assembly 23 to improve the fixing stability of the electrode assembly 23. The shape of the hollow slot 324 may be similar or identical to the relief area 213 of the relief structure 212. The bottom wall 321 of the protrusion structure 32 is a closed structure, which is understood that the bottom wall 321 is a solid continuous structure, and electrolyte or air cannot or basically cannot flow to the hollow groove 324 through the bottom wall 321 in the casing 22, and further directly impact the pressure release structure 212, that is, the bottom wall 321 is not provided with a through hole, or the bottom wall 321 is not hollow. The communication opening 323 on the side wall 322 is hollow and arranged corresponding to the side wall 322, and the communication opening 323 penetrates through two opposite side surfaces of the side wall 322, so that the communication opening 323 is communicated with the hollow groove 324 and the inner space of the shell 22. The communication port 323 may be provided in one side wall 322, or may be provided in plural at intervals on the side wall 322.

The single battery 20 of this application embodiment sets up the intercommunication mouth 323 on the lateral wall 322 of protruding structure 32, and when single battery 20 took place thermal runaway, the discharge in the single battery 20 can flow to hollow tank 324 through the intercommunication mouth 323, then flows to pressure release structure 212 through the gas vent, realizes the release of single battery 20 internal pressure.

In some technologies, the bottom wall 321 of the protruding structure 32 is provided with a through hole through which the effluent in the battery cell 20 flows, and since the bottom wall 321 is opposite to the pressure release structure 212, in this case, when the battery cell 20 falls or vibrates, the electrolyte or air flow in the casing 22 will impact the pressure release structure 212 in the upward direction through the through hole in the bottom wall 321, which easily causes the pressure release structure 212 to open to leak the electrolyte, and the battery 100 is damaged. The bottom wall 321 of the protruding structure 32 in this embodiment is configured as a closed structure, the communication opening 323 is disposed on the side wall 322, when the electrolyte or air flow impacts the side of the end cap 21 due to the falling or vibration of the battery cell 20, the electrolyte or air flow impacts the bottom wall 321 first and then flows to the side along the bottom wall 321, so that the possibility that the electrolyte or air flow directly impacts the pressure release structure 212 in front is reduced, the possibility that the pressure release structure 212 is opened due to the falling or vibration of the battery cell 20 is reduced, and the shock resistance of the battery cell 20 is improved.

Optionally, referring to fig. 6, and further referring to fig. 7, fig. 7 schematically illustrates an enlarged a portion of fig. 6, the side wall 322 includes a first side portion 3221 and a second side portion 3222, the first side portion 3221 is disposed opposite to the second side portion 3222 and disposed on two sides of the hollow slot 324, and the first side portion 3221 and the second side portion 3222 are each provided with a communication port 323.

Each of the first side portion 3221 and the second side portion 3222 is a portion of the side wall 322 that encloses the hollow slot 324. The first side portion 3221 and the second side portion 3222 are each provided with a communication port 323, so that the communication ports 323 are respectively provided on opposite sides of the hollow groove.

By providing the communication ports 323 on the opposite sides of the hollow groove 324, respectively, when thermal runaway occurs in the battery cell 20, the exhaust in the battery cell 20 can be made to enter the hollow groove 324 through the both sides of the hollow groove 324, so that the exhaust can be dispersed and flowed, and the convenience of exhaust is improved. In addition, during the battery cell 20 or vibration, the electrolyte or the air flow in the casing 22 may flow in a dispersed manner, and the electrolyte and the air flow may form a loop between the communication port 323 of the first side portion 3221 and the communication port 323 of the second side portion 3222, and the loop is substantially parallel to the bottom surface of the pressure release structure 212, so that the impact of the electrolyte or the air flow on the pressure release structure 212 may be further reduced, and the possibility of leakage of the electrolyte during the battery cell 20 or vibration is reduced.

Optionally, as shown in fig. 6 and 7, a plurality of communication ports 323 are disposed on the first side portion 3221 at intervals according to some embodiments of the present application; and/or a plurality of communication ports 323 are provided at intervals on the second side portion 3222.

The first side portion 3221 may be provided with a plurality of communication ports 323, and the plurality of communication ports 323 may be disposed in a dispersed manner, specifically may be disposed at intervals along a height direction of the first side portion 3221, or may be disposed at intervals along a length direction of the first side portion 3221. In some implementations, as shown in fig. 7, the communication openings 323 on the first side portion 3221 are disposed at intervals along the length direction of the first side portion 3221, and each communication opening 323 may extend from a top end of the first side portion 3221 to a bottom end of the first side portion 3221.

The second side portion 3222 may be provided with a plurality of communication ports 323, and the plurality of communication ports 323 may be disposed in a dispersed manner, specifically may be disposed at intervals along the height direction of the second side portion 3222, or may be disposed at intervals along the length direction of the second side portion 3222. In some implementations, the communication openings 323 on the second side portion 3222 are spaced apart along the length of the second side portion 3222, and each communication opening 323 may extend from a top end of the second side portion 3222 to a bottom end of the first side portion 3221.

The number of the communication openings 323 on the first side portion 3221 may be the same as or different from the number of the communication openings 323 on the second side portion 3222. The communication opening 323 on the first side portion 3221 and the communication opening 323 on the second side portion 3222 may be disposed opposite to each other or may be disposed in a staggered manner. In some implementations, the first side 3221 and the second side 3222 are symmetrically disposed, and the communication ports 323 on the two are also symmetrically disposed.

By providing the plurality of communication openings 323 on the first side portion 3221 and/or the second side portion 3222, the electrolyte can be split when the battery cell 20 falls or vibrates, and the impact of the electrolyte can be reduced. And, the plurality of communication openings 323 are arranged at intervals, and the part of the side wall 322 between two adjacent communication openings 323 can play a supporting role, so that the first side portion 3221 or the second side portion 3222 still has better strength, and the end face of the electrode assembly 23 can be effectively supported.

According to some embodiments of the present application, optionally, as shown in fig. 6 and 7, the first side portion 3221 and/or the second side portion 3222 are provided with reinforcing ribs 325, both sides of the reinforcing ribs 325 are provided with communication ports 323, and a width L1 of the reinforcing ribs 325 is 2 mm to 5 mm.

The reinforcement rib 325 may be a portion of the side wall 322, that is, a portion of the side wall 322 between two communication ports 323 may be understood as the reinforcement rib 325, specifically, the communication ports 323 may be hollowed out on the side wall 322, and a portion of the side wall 322 between two adjacent communication ports 323 corresponds to the reinforcement rib 325. That is, the rib 325 may be a part of the first side portion 3221 or the second side portion 3222, and the rib 325 is formed between two adjacent communication openings 323 of the first side portion 3221 when the plurality of communication openings 323 are provided in the first side portion 3221, and the rib 325 is formed between two adjacent communication openings 323 of the second side portion 3222 when the plurality of communication openings 323 are provided in the second side portion 3222. The thickness of the rib 325 and the sidewall 322 where it is located may be approximately 0.3 mm to 1.2 mm, and the width L1 of the rib 325 may be 2 mm to 5 mm, specifically 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or 5 mm. Wherein the thickness of the sidewall 322 is the minimum distance between the side of the sidewall 322 facing the hollow slot 324 and the side of the sidewall 322 facing away from the hollow slot 324, i.e., the distance between the opposite sides of the sidewall 322, the thickness of the ribs 325 can be understood with reference to the thickness of the sidewall 322; the width L1 of the rib 325 is the dimension of the rib 325 in the arrangement direction of the two adjacent communication ports 323.

The reinforcing ribs 325 are between two adjacent communication ports 323, which can play a supporting role, so that the side wall 322 has better strength, and the side wall 322 can effectively support the end face of the electrode assembly 23.

Optionally, according to some embodiments of the present application, the total flow area of all communication ports 323 is greater than the relief area of relief structure 212.

Here, the total flow area of all the communication openings 323 is the sum of the flow areas of all the communication openings 323 on the side wall 322, for example, in the case where the communication openings 323 are provided on both the first side portion 3221 and the second side portion 3222, the total flow area of all the communication openings 323 is the sum of the flow areas of all the communication openings 323 on the first side portion 3221 and all the communication openings 323 on the second side portion 3222. The flow area of the communication port 323 can be understood with reference to the flow cross-sectional area of the communication port 323, and the flow cross-section is a cross-section perpendicular to the axial direction of the communication port 323.

The pressure relief area of the pressure relief structure 212 is the area of the pressure relief area 213 that can be formed by the pressure relief structure 212 when opened, from which the effluent in the cell 20 flows out. The pressure relief area 213 is an area of the end cap 21 corresponding to the pressure relief structure 212, that is, an area of the end cap 21 that can be opened by the pressure relief structure 212 to communicate with the outside of the housing 22. The pressure release structure 212 is disposed in the pressure release area 213, and in a natural state, the pressure release structure 212 seals the pressure release area 213, and when the battery cell 20 is out of control, the pressure release structure 212 can open the pressure release area 213. The area of the relief area 213 is the area of the relief area 213 in the plane of the end cap 21, and does not relate to the dimension of the relief area 213 in the thickness direction of the end cap 21.

The total communication area of all the communication ports 323 is larger than the pressure relief area of the pressure relief structure 212, so that when the battery unit 20 is in thermal runaway, the discharged materials in the battery unit 20 can smoothly flow to the pressure relief structure 212 through the communication ports 323, the flow limiting effect of the communication ports 323 on the discharged materials is reduced, and the effective discharge of the discharged materials is maintained.

Optionally, according to some embodiments of the present application, the total flow area of all communication ports 323 is greater than or equal to 1.2 times the relief area of relief structure 212.

Specifically, the total flow area of all the communication ports 323 may be 1.2 times, 1.3 times, 1.5 times, 2 times, 3 times, etc. the pressure relief area of the pressure relief structure 212.

The larger the total flow area of all the communication ports 323, the more advantageous the flow of the medium such as the electrolyte, gas, or exhaust. The arrangement of the communication port 323 is limited by the size of the side wall 322 of the protruding structure 32, wherein the protruding structure 32 has a spacing gap between a part of the position of the body 31 and the main body portion 232 of the electrode assembly 23, the spacing gap is used for arrangement of the tab 231, the connecting piece 24 and the like, and the tab 231, the connecting piece 24 can be pressed against by the body 31, so the height of the protruding structure 32 (i.e., the height of the side wall 322) is limited by the height of the member (e.g., the tab 231, the connecting piece 24 and the like) between the main body portion 232 and the top cover of the electrode assembly 23; the protrusion 32 is disposed in a plane perpendicular to the height direction, so that the tab 231, the connecting piece 24, etc. are avoided, and the protrusion 32 does not extend beyond the body 31 of the insulating protector 30, so that the length of the side wall 322 is limited. The side wall 322 needs to have a certain supporting strength, so the side wall 322 cannot be completely hollowed out, and the total flow area of all the communication openings 323 is generally smaller than the area of the side wall 322. In short, the maximum value of the total flow area of all the communication ports 323 should not affect the support requirement of the insulating protector 30 for the electrode assembly 23, and the insulating protector 30 should not interfere with other members.

Optionally, according to some embodiments of the present application, relief structure 212 has relief area 213, with the projection of relief area 213 into bottom wall 321 being located within hollow slot 324.

The projection of the pressure relief area 213 to the bottom wall 321 is the orthographic projection of the pressure relief area 213 to the side of the bottom wall 321, that is, the projection of the pressure relief area 213 to the bottom wall 321 along the direction perpendicular to the bottom wall 321. The projection of the relief area 213 into the bottom wall 321 is located within the hollow groove 324, it being understood that the projection of the relief area 213 into the bottom wall 321 is located inside the circumferential edge of the hollow groove 324, wherein the circumferential edge of the hollow groove 324 may be understood with reference to the circumferential edge of the bottom wall 321. That is, the relief area 213 is located directly above the hollow slot 324 and inside the hollow slot 324.

The projection of the pressure relief area 213 is located in the hollow groove 324, so that the pressure relief area 213 can be well shielded by the bottom wall 321, and the possibility that the electrolyte or air flow in the battery cell 20 directly impacts the pressure relief area 213 is reduced; meanwhile, when the battery cell 20 is in thermal runaway, the exhaust entering the hollow groove 324 can flow to the pressure relief area 213 more smoothly and flow out of the pressure relief area 213, which is beneficial to improving the thermal runaway protection effect of the battery cell 20.

Optionally, as shown in fig. 6 and 7, a maximum dimension L2 of the hollow groove 324 is greater than or equal to 1.2 times a maximum dimension W1 of the pressure relief zone 213 along a first direction X, which is a length direction of the first side 3221, according to some embodiments of the present application.

The height direction of the first side portion 3221 is perpendicular to the bottom wall 321, the length direction of the first side portion 3221 is perpendicular to the bottom wall 321, and the first direction X may correspond to the length direction of the hollow groove 324. The first side portion 3221 and the second side portion 3222 are disposed opposite to each other, and may have substantially the same extending direction.

The hollow slot 324 may be the same or similar in shape as the relief area 213, and the center line of the hollow slot 324, the center line of the bottom wall 321, and the center line of the relief area 213 may be disposed collinearly. The pressure relief area 213 may be a track-shaped structure with a rectangular middle portion and two semicircular ends connected with each other, and the maximum dimension W1 of the pressure relief area 213 along the first direction X may be a distance between two points with the farthest distance in the semicircular ends. The hollow groove 324 is similar to the relief area 213, and the first side portion 3221 and the second side portion 3222 may be opposite side portions of the protrusion structure 32 having a longer middle extension length, and a third side portion 3223 and a fourth side portion 3224 are further disposed at both ends of the first side portion 3221 and the second side portion 3222, and the third side portion 3223 is opposite to the fourth side portion 3224 and is disposed substantially in parallel, and a maximum dimension L2 of the hollow groove 324 along the first direction X may be understood with reference to an inner dimension between the third side portion 3223 and the fourth side portion 3224.

The largest dimension L2 of the hollow slot 324 in the first direction X may be 1.2 times, 1.3 times, 1.4 times, 2 times, 2.4 times, etc. the largest dimension W1 of the relief zone 213 in the first direction X. The largest dimension L2 of the hollow slot 324 in the first direction X does not exceed the dimension of the raised structure 32 and the body 31 in the first direction X.

Because the largest dimension L2 of the hollow groove 324 along the first direction X is greater than the largest dimension W1 of the pressure relief area 213 along the first direction X, the length dimension of the first side portion 3221 corresponding to the hollow groove 324 and the length dimension of the second side portion 3222 corresponding to the hollow groove 324 are greater, which is beneficial to providing more communication ports 323, so that the total flow area of all the communication ports 323 is increased.

Optionally, according to some embodiments of the present application, a maximum dimension L3 of the hollow groove 324 is greater than or equal to 1.2 times a maximum dimension W2 of the pressure relief zone 213 along a second direction Y, which is a direction of the first side 3221 toward the second side 3222.

The second direction Y is parallel to the bottom wall 321, and may be perpendicular to the first direction X, and corresponds to the width direction of the hollow groove 324.

The largest dimension L3 of the hollow slot 324 in the second direction Y may be 1.2 times, 1.3 times, 1.5 times, 1.7 times, 2 times, 2.4 times, etc. the largest dimension W2 of the relief zone 213 in the second direction Y. The largest dimension L3 of the hollow groove 324 in the second direction Y does not exceed the dimension of the protrusion 32 and the body 31 in the second direction Y.

The size of the hollow groove 324 is limited to the size of the bottom wall 321, and the size of the hollow groove 324 is larger, so that the buffer effect of the bottom wall 321 on electrolyte or air flow can be improved, the possibility that the electrolyte or air flow impacts the bottom wall 321 to deform the bottom wall 321 to impact the pressure release structure 212 is reduced, and the stability of the pressure release structure 212 when the battery cell 20 falls or vibrates is improved.

Optionally, according to some embodiments of the present application, the body 31 is of unitary construction with the raised structure 32.

The body 31 and the protruding structure 32 can be an integrated structure, so that the processing is convenient, and the structure stability is good.

Optionally, according to some embodiments of the present application, the body 31 and the bump structure 32 are plastic parts.

Optionally, according to some embodiments of the present application, bottom wall 321 abuts electrode assembly 23.

The abutment of the bottom wall 321 with the electrode assembly 23 can limit the electrode assembly 23, and reduce the possibility of vibration or shaking of the electrode assembly 23 in the housing 22.

Optionally, according to some embodiments of the present application, the side wall 322 includes a third side portion 3223 and a fourth side portion 3224, each of the third side portion 3223 and the fourth side portion 3224 is connected between the first side portion 3221 and the second side portion 3222, and the third side portion 3223 and the fourth side portion 3224 are disposed opposite to each other at two ends of the hollow slot 324, and the third side portion 3223 and/or the fourth side portion 3224 are of a closed structure.

The third side portion 3223 may be a solid closed structure, and has no hollow hole communicated with the hollow groove 324, so that the third side portion may have better hollow strength, and the supporting capability of the side wall 322 is improved.

The fourth side portion 3224 may be a solid closed structure, on which no hollow hole is formed and communicated with the hollow groove 324, which has better hollow strength and improves the supporting capability of the side wall 322.

Wherein, the third side portion 3223 and the fourth side portion 3224 may be partially provided with a hollow cavity 34, the hollow cavity 34 is isolated from the hollow hole, and a reinforcing plate 35 may be provided in the hollow cavity 34. The hollow cavity 34 may reduce the weight of the insulating protector 30 and is advantageous in that the thickness of the insulating protector 30 is maintained to be substantially uniform throughout, so that the deformation of the insulating protector 30 is more uniform, and the possibility of local distortion of the insulating protector 30 due to the greater thickness of the third side portion 3223 and the fourth side portion 3224 is reduced. The reinforcing plate 35 is provided in the hollow cavity 34 to maintain the supporting strength of the third and fourth side portions 3223 and 3224.

The third side portion 3223 and the fourth side portion 3224 may be sequentially arranged in the width direction of the body 31 and respectively extend in the length direction of the body 31. The first side portion 3221 and the second side portion 3222 may be sequentially arranged along the length direction of the body 31 and extend along the width direction of the body 31, respectively.

According to some embodiments of the present application, optionally, as shown in fig. 4 to 6, the opposite ends of the body 31 are further provided with protrusions 33, the protrusions 33 are located at a side connected to the body 31 facing the electrode assembly 23, the protrusions 33 are abutted with the electrode assembly 23, and the protrusions 33 are spaced apart from the protrusion structures 32.

The protruding portions 33 may be disposed at both ends of the body 31 in the length direction and extend in the width direction of the body 31. The protrusion 33 may support the body 31 and may abut against the electrode assembly 23 to increase the fixing effect on the electrode assembly 23 and reduce the possibility of vibration or shaking of the electrode assembly 23 within the case 22. The protrusion 33 may be provided with a hollow structure.

The material of the protruding portion 33 and the material of the body 31 may be the same, and may be integrally formed with the body 31.

Some embodiments of the present application also provide a battery 100 including the battery cell 20 as set forth herein or any embodiment of the present application.

Some embodiments of the present application further provide an electrical device, including the battery 100 of any of the above aspects, and the battery 100 is used to provide electrical energy for the electrical device.

The powered device may be any of the devices or systems described above that employ battery 100.

According to some embodiments of the present application, as shown in fig. 3 to 7, the present embodiment provides a battery cell 20 including a case 22, an end cap 21, an electrode assembly 23, and an insulation protector 30, the case 22 having an opening, the end cap 21 covering the opening, and a pressure relief structure 212 provided on the end cap 21; the electrode assembly 23 is disposed in the case 22, the insulating protection member 30 is disposed on a side of the end cap 21 facing the electrode assembly 23, the insulating protection member 30 includes a body 31 and a protrusion structure 32, the body 31 is provided with an exhaust port 311, and the protrusion structure 32 and the pressure release structure 212 are disposed on a bottom side and a top side of the exhaust port 311. The protrusion structure 32 is provided with a hollow groove 324, the protrusion structure 32 comprises a bottom wall 321 and a side wall 322, the bottom wall 321 is opposite to the pressure relief structure 212 and is abutted to the electrode assembly 23, the bottom wall 321 is a closed structure, the side wall 322 is connected between the bottom wall 321 and the body 31, the side wall 322 comprises a first side portion 3221 and a second side portion 3222, the first side portion 3221 and the second side portion 3222 are oppositely arranged on two sides of the hollow groove 324, and a plurality of communication ports 323 are formed in the first side portion 3221 and the second side portion 3222. The first side portion 3221 is provided with the reinforcing rib 325 between the two adjacent communication ports 323, the second side portion 3222 is provided with the reinforcing rib 325 between the two adjacent communication ports 323, and the width L1 of the reinforcing rib 325 is 2 mm to 5 mm. The total flow area of all communication ports 323 is greater than or equal to 1.2 times the relief area of relief structure 212. The pressure release structure 212 has a pressure release area 213, a projection of the pressure release area 213 to the bottom wall 321 is located in the hollow groove 324, and a maximum dimension L2 of the hollow groove 324 is greater than or equal to 1.2 times a maximum dimension W1 of the pressure release area 213 along a first direction X, where the first direction X is a length direction of the first side portion 3221; the largest dimension L3 of the hollow groove is greater than or equal to 1.2 times the largest dimension W2 of the relief zone 213 along the second direction Y, which is the direction of the first side 3221 toward the second side 3222. The body 31 and the protruding structure 32 are integrated, and the body 31 and the protruding structure 32 are plastic parts. The side wall 322 includes a third side portion 3223 and a fourth side portion 3224, the third side portion 3223 and the fourth side portion 3224 are all connected between the first side portion 3221 and the second side portion 3222, the third side portion 3223 and the fourth side portion 3224 are oppositely disposed at two ends of the hollow slot 324, and the third side portion 3223 and the fourth side portion 3224 are all of a closed structure. The opposite ends of the body 31 are also provided with protruding parts 33, the protruding parts 33 are positioned on one side of the body 31 facing the electrode assembly 23, the protruding parts 33 are abutted with the electrode assembly 23, and the protruding parts 33 are arranged at intervals with the protruding structures 32.

The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (16)

1. A battery cell, comprising:

a housing having an opening;

The end cover is covered on the opening and is provided with a pressure relief structure;

an electrode assembly disposed within the housing;

the insulation protection piece is arranged on one side of the end cover facing the electrode assembly, the insulation protection piece comprises a body and a protruding structure, the body is provided with an exhaust port, the protruding structure and the pressure relief structure are arranged corresponding to the position of the exhaust port, and the protruding structure is arranged on one side of the body away from the pressure relief structure;

the utility model discloses a relief structure, including protruding structure, relief structure, body, the protruding structure is provided with the hollow tank, protruding structure includes diapire and lateral wall, the diapire with the relief structure sets up relatively, the diapire is enclosed construction, the lateral wall is connected the diapire with between the body, be provided with at least one intercommunication mouth on the lateral wall, the intercommunication mouth passes through the hollow tank with the gas vent intercommunication.

2. The battery cell according to claim 1, wherein the side wall includes a first side portion and a second side portion, the first side portion and the second side portion are disposed opposite to each other and are disposed on both sides of the hollow groove, and the communication ports are disposed on both the first side portion and the second side portion.

3. The battery cell of claim 2, wherein a plurality of communication ports are provided on the first side at intervals;

and/or a plurality of communication ports are arranged on the second side part at intervals.

4. A battery cell according to claim 3, wherein the first side portion and/or the second side portion is provided with a reinforcing rib, both sides of the reinforcing rib are provided with the communication ports, and the width L1 of the reinforcing rib is 2 mm to 5 mm.

5. The battery cell of claim 1, wherein a total flow area of all of the communication ports is greater than a relief area of the relief structure.

6. The battery cell of claim 5, wherein a total flow area of all of the communication ports is greater than or equal to 1.2 times a relief area of the relief structure.

7. The battery cell of claim 2, wherein the relief structure has a relief area, a projection of the relief area to the bottom wall being located within the hollow channel.

8. The battery cell of claim 7, wherein a maximum dimension L2 of the hollow groove is greater than or equal to 1.2 times a maximum dimension W1 of the relief zone in a first direction, the first direction being a length direction of the first side portion.

9. The battery cell of claim 8, wherein a maximum dimension L3 of the hollow groove is greater than or equal to 1.2 times a maximum dimension W2 of the relief zone in a second direction, the second direction being a direction of the first side toward the second side.

10. The battery cell of any one of claims 1-9, wherein the body is of unitary construction with the raised structure.

11. The battery cell of any one of claims 1-9, wherein the body and the protruding structure are plastic pieces.

12. The battery cell of any one of claims 1-9, wherein the bottom wall abuts the electrode assembly.

13. The battery cell of any one of claims 2-4 or 7-9, wherein the side wall further comprises a third side portion and a fourth side portion, wherein the third side portion and the fourth side portion are each connected between the first side portion and the second side portion, and wherein the third side portion and the fourth side portion are disposed at opposite ends of the hollow groove, and wherein the third side portion and/or the fourth side portion are of a closed structure.

14. The battery cell according to any one of claims 1 to 9, wherein the opposite ends of the body are further provided with protrusions, the protrusions are connected to a side of the body facing the electrode assembly, the protrusions are abutted against the electrode assembly, and the protrusions are spaced apart from the protrusion structure.

15. A battery comprising a cell according to any one of claims 1-14.

16. An electrical device comprising the battery of claim 15 for providing electrical energy.