CN220692260U

CN220692260U - Battery monomer, battery and power consumption device

Info

Publication number: CN220692260U
Application number: CN202420086804.7U
Authority: CN
Inventors: 白璐璐; 杨道伟; 郑挺; 李全坤
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-01-15
Filing date: 2024-01-15
Publication date: 2024-03-29
Anticipated expiration: 2034-01-15

Abstract

The application relates to the technical field of batteries, the utility model discloses a battery monomer, battery and power consumption device, the battery monomer includes the casing, the end cover, electrode assembly and insulation protection spare, the casing has the opening, the end cover closes in the opening, be provided with pressure release structure on the end cover, electrode assembly locates in the casing, insulation protection spare locates the end cover towards one side of electrode assembly, insulation protection spare includes the body, the relative both ends of body are connected with bearing structure respectively, bearing structure deviates from one side of end cover sets up for the body protrusion, bearing structure at body both ends has the first lateral wall that faces each other, bearing structure of at least one end of body is provided with first intercommunication mouth and the second intercommunication mouth that is linked together, first intercommunication mouth sets up in first lateral wall, bearing structure is provided with the second intercommunication mouth on the diapire adjacent with first lateral wall at least. When the battery monomer falls or vibrates, electrolyte or air flow can be split, so that the possibility of electrolyte leakage caused by the fact that the pressure release structure is opened by impact 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 has the opening, and the end cover lid closes in the opening, is provided with pressure release structure on the end cover, and in the casing was located to the electrode assembly, insulating protection piece was located the end cover is towards one side of electrode assembly, insulating protection piece includes the body, the relative both ends of body are connected with bearing structure respectively, bearing structure deviates from one side of end cover for the body protrusion sets up, two at body both ends bearing structure has the first lateral wall that faces each other, bearing structure still has the orientation electrode assembly's diapire, same bearing structure the diapire with be adjacent and be connected of first lateral wall, be provided with on the bearing structure of at least one end be provided with first communication port the second communication port that the bearing structure is last still to be provided with first communication port intercommunication, the second communication port set up at least in bearing structure on the diapire.

In the technical scheme of this embodiment, when battery monomer falls or vibrates and leads to electrolyte or air current to end cover side impact, electrolyte or air current can flow to the second flow port from bearing structure's first communication port, electrolyte or air current is shunted to the lateral part of insulating protection piece, and to the lateral part of electrode assembly, reduced the accumulation of electrolyte or gas in relief structure position, reduced electrolyte or air current to relief structure's impact effect, thereby reduced battery monomer and fallen or vibrate and lead to relief structure to open, and make the possibility that electrolyte leaked, improved battery monomer's shock resistance.

In some embodiments of the present application, a plurality of the first communication ports are disposed on the support structure at intervals, and/or a plurality of the second communication ports are disposed on the support structure at intervals. The support structure is provided with the first communication ports and/or the second communication ports at intervals, so that the flow area of the first communication ports and/or the second communication ports can be increased, the shunting effect on electrolyte or air flow can be improved, and the impact of the electrolyte or air flow on the pressure release structure when the battery monomer falls or vibrates can be reduced. Meanwhile, compared with a larger and continuous first communication port or second communication port, the first communication port and/or the second communication port with intervals have smaller influence on the strength of the supporting structure, so that the supporting structure is beneficial to maintaining the supporting and limiting effect of the supporting structure on the electrode assembly, and the possibility of the electrode assembly moving or shaking in the shell is reduced.

In some embodiments of the present application, the number of all the first communication ports on two of the support structures is not less than four; and/or, the second side walls of the supporting structures are also provided with second communication ports, the number of all the second communication ports of the two supporting structures, which are positioned on the second side walls, is not less than four, and the second side walls are walls, opposite to the first side walls, of the supporting structures. The first communication ports and/or the second communication ports with a plurality of intervals are arranged on the supporting structure, so that the air flow or the electrolyte can be split at a plurality of positions, the splitting effect on the electrolyte or the air flow is improved, and the impact of the electrolyte or the air flow on the pressure release structure is reduced when the battery monomer falls or vibrates.

In some embodiments of the present application, the total flow area of all the first communication ports on both the support structures is greater than or equal to 1.2 times the relief area of the relief structure; and/or the total flow area of all the second communication ports on the two supporting structures is greater than or equal to 1.2 times of the pressure relief area of the pressure relief structure. The limitation of the total flow area of the first communication port and the total flow area of the second communication port is beneficial to improving the flow dividing effect of the electrolyte or the air flow.

In some embodiments of the present application, the bottom wall abuts the electrode assembly. The bottom wall is abutted with the electrode assembly, so that the setting stability of the electrode assembly in the shell can be improved, partial gaps still remain when the bottom wall is abutted with the main body part of the electrode assembly, and electrolyte or gas flowing out of the second communication port can flow to two sides of the electrode assembly through the gaps.

In some embodiments of the present application, the second communication port on the bottom wall is a circular hole having a diameter 1/10 to 1/2 times the width dimension L3 of the bottom wall. The size of the circular hole is limited, so that the influence of the second communication port on the strength of the bottom wall can be reduced, and the bottom wall can maintain the limit supporting function on the electrode assembly.

In some embodiments of the present application, the circular aperture has a diameter of 0.5 mm to 3 mm.

In some embodiments of the present application, a total flow area of all the second communication ports of the two support structures located at the bottom wall is greater than or equal to 0.5 times a pressure relief area of the pressure relief structure. The total flow area of all the second communication ports on the bottom wall of the embodiment is limited, so that the strength influence of the second communication ports on the bottom wall can be reduced while the good flow distribution effect is achieved, and the bottom wall can maintain the limit supporting function on the electrode assembly.

In some embodiments of the present application, the support structure is a hollow structure, and the first communication port and the second communication port communicate through a cavity inside the support structure. Through setting up bearing structure to hollow structure, can reduce the weight of insulating protection piece, be favorable to the lightweight design of battery monomer to hollow structure also can reduce bearing structure's hardness, is favorable to insulating protection piece's whole deformation, has reduced under certain circumstances that body deformation is too big and bearing structure is difficult to the deformation, leads to whole insulating protection piece to take place unexpected deformation's possibility.

In some embodiments of the present application, the support structure is provided with a stiffener within the cavity. The strength of the supporting structure can be improved by the reinforcing piece, so that the supporting structure still has good supporting performance when a large cavity is formed, the limiting supporting effect of the insulating protecting piece on the electrode assembly is improved, and the possibility of the electrode assembly moving or shaking in the shell is reduced.

In some embodiments of the present application, the stiffener is connected between the first sidewall and a second sidewall, the second sidewall being a wall of the support structure opposite the first sidewall. The reinforcement is connected between first lateral wall and second lateral wall, is difficult for causing the interference to the intercommunication of first intercommunication mouth and second intercommunication mouth, and can improve bearing structure's intensity for bearing structure sets up when great cavity, still can have better supporting property, has improved insulating protection piece spacing supporting role to electrode assembly, has reduced the possibility that electrode assembly drunkenness or rocked in the casing.

In some embodiments of the present application, the reinforcement member divides the support structure into a plurality of cavities, the first side wall is provided with the first communication port corresponding to a plurality of the cavities, and the wall adjacent to the first side wall and/or the second side wall is provided with the second communication port corresponding to a plurality of the cavities. Through all being provided with first communication port and second communication port through corresponding every cavity, be favorable to improving the reposition of redundant personnel effect to electrolyte or air current.

In some embodiments of the present application, a side of the support structure facing the end cover is hollowed out. One side of the supporting structure facing the end cover is hollowed out, so that the weight of the insulating protection piece is reduced, and the lightweight design of the battery cell is facilitated.

In some embodiments of the present application, the second side wall of the support structure is provided with the second communication port, the second communication port of the second side wall and the second side wall are disposed at intervals towards the end face of the end cover, and the second side wall is a wall of the support structure opposite to the first side wall. The second communication port on the second side wall is not communicated with the top end of the second side wall, so that the supporting structure has good supporting strength, and the influence of the second communication port on the strength of the second side wall is reduced.

In some embodiments of the present application, the second side wall has a dimension L1 in a direction of the end cap toward the electrode assembly, and a minimum distance between an end surface of the second side wall toward the end cap and the second communication port on the second side wall is L2, L2 being 1/10 to 1/4 times L1. The size of the smallest distance between the end face of the second side wall facing the end cover and the second communication port on the second side wall is limited, so that the second communication port has a larger flow area, and the influence of the second communication port on the strength of the second side wall can be reduced.

In some embodiments of the present application, a minimum distance L2 between an end surface of the second side wall facing the end cap and the second communication port on the second side wall is 0.5 mm to 2 mm.

In some embodiments of the present application, the first sidewall is disposed toward an end surface of the end cap at a distance from the first communication port. The second communication port does not penetrate through to the top end of the first side wall, so that the supporting structure has good supporting strength, and the influence of the first communication port on the strength of the first side wall is reduced.

In some embodiments of the present application, the body is of unitary construction with the support structure. The supporting structure and the body are of an integrated structure, so that the insulation protection piece has higher structural stability and connection strength.

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

In some embodiments of the present application, an exhaust hole is provided at a position of the insulation protection member corresponding to the pressure relief structure.

In some embodiments of the present application, the insulating protection member further includes a protrusion structure corresponding to the pressure relief structure, the protrusion structure is located at a side of the body facing away from the end cap and is abutted to the electrode assembly, and the vent hole includes a first vent hole penetrating through the body and the protrusion structure. The protruding structure can strengthen the intensity of insulating protection piece, improves the spacing supporting performance of insulating protection piece to electrode assembly.

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 providing vehicle according to 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 a split schematic of an end cap and insulation protector of some embodiments of the present application;

FIG. 6 schematically illustrates a schematic view of an insulation protector according to some embodiments of the present application;

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

FIG. 8 schematically illustrates a schematic view of an insulation protector according to some embodiments of the present application;

fig. 9 is an enlarged view of a portion B of fig. 8.

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; 32. a support structure; 321. a first sidewall; 3211. a first end face; 322. a second sidewall; 3221. a second end face; 323. a bottom wall; 324. a first communication port; 325. a second communication port; 326. a circular hole; 327. a reinforcing member; 328. a cavity; 33. an exhaust hole; 331. a first exhaust hole; 332. a second exhaust hole; 34. a bump structure; 35. reinforcing ribs;

200. a controller;

300. a motor;

x, a first direction; y, second direction; z, height 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 problem that electrolyte was leaked easily, this application provides a battery monomer, and the battery monomer sets up first intercommunication mouth and the second intercommunication mouth of intercommunication on the bearing structure at insulating protection piece one end or both ends, and first intercommunication mouth sets up on the bearing structure at both ends first lateral wall that faces each other, the second intercommunication mouth set up on bearing structure with first lateral wall is adjacent or opposite wall. Electrolyte or air flow impacting the end cover can be split to the first communication port and flows to the side part of the electrode assembly after flowing through the second communication port, so that accumulation of the electrolyte or the air at the pressure release structure is reduced, impact of the electrolyte or the air flow on the pressure release structure is reduced, the possibility that the electrolyte leaks due to the fact that the pressure release structure is opened due to falling or vibration of a battery monomer is reduced, and 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 insulating protection member 30 mainly has two functions, namely, the insulating protection member can be used for isolating the electric connection part in the shell 22 from 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, since 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 insulating protection member 30 so as to reduce the possibility of up-and-down movement of the electrode assembly 23.

Referring to fig. 3, with further reference to fig. 4 and 5, fig. 4 schematically illustrates an assembled structure of the end cap and the insulating protector of some embodiments of the present application, and fig. 5 schematically illustrates a split schematic view of the end cap and the insulating protector of some embodiments of the present application, the present embodiment provides 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 cover 21 covers the opening, a pressure relief structure 212 is arranged on the end cover 21, and 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, two opposite ends of the body 31 are respectively connected with a supporting structure 32, one side of the supporting structure 32, which is away from the end cover 21, protrudes from the body 31, the two supporting structures 32 at the two ends of the body 31 are provided with first side walls 321 facing each other, the supporting structure 32 is also provided with a bottom wall 323 facing the electrode assembly 23, the bottom wall 323 of the same supporting structure 32 is adjacent to and connected with the first side walls 321, the supporting structure 32 at least one end is provided with a first communication port 324, the supporting structure 32 provided with the first communication port 324 is also provided with a second communication port 325 communicated with the first communication port 324, and the second communication port 325 is at least arranged on the bottom wall of the supporting structure 32.

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 support structure 32 of the insulating protector 30 is attached to the end of the body 31, in particular to the end face of the body 31. The body 31 and the support structure 32 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 34 may be the same, and may be an insulating material, specifically, a plastic member.

As shown in fig. 5, the top end of the support structure 32 (the end facing the end cap 21, i.e., the end where the top wall is located) may be disposed flush with the top surface of the body 31 (the surface facing the end cap 21), and both the top end of the support structure 32 and the top surface of the body 31 may be in contact with and connected to the bottom wall of the end cap 21. The side of the support structure 32 facing away from the end cap 21 is arranged to protrude relative to the body 31, and it is understood that the bottom wall 323 of the support structure 32 (the wall facing away from the end cap 21) is arranged to protrude downward relative to the bottom surface of the body 31 (the surface facing away from the end cap 21), so that two support structures 32 at both ends of the body 31 each have a protruding portion located below the bottom surface of the body 31, and the protruding portions of the two support structures 32 are arranged opposite to each other and at intervals. Wherein, the bottom wall 323 of the supporting structure 32, i.e. the bottom wall 323 of the protruding portion, may abut against the main body portion 232 of the electrode assembly 23 to support the electrode assembly 23, thereby reducing the possibility of shaking the electrode assembly 23 in the case 22. Between the two protruding portions, the body 31 and the main body portion 232 of the electrode assembly 23 may be spaced apart to form a spacing gap for fitting the tab 231, the connection piece 24, etc. The opposite and mutually adjacent side walls of the two protrusions at the two ends of the body 31 are first side walls 321, that is, the side wall facing the spacing gap in each supporting structure 32 is the first side wall 321.

The both ends of the body 31 may be both ends of the body 31 in the length direction of the main body 232 of the electrode assembly 23, that is, both ends of the body 31 in the length direction. The length direction of the body 31 can be understood with reference to the second direction Y shown in the drawings.

Of the two support structures 32 at the two ends of the body 31, the first communication port 324 and the second communication port 325 may be provided on one of the support structures 32, or the first communication port 324 and the second communication port 325 may be provided on the two support structures 32. The first communication port 324 is disposed on the first sidewall 321, and the first communication port 324 can communicate with a gap between the two support structures 32. The bottom wall 323 adjacent to the first sidewall 321 may be provided with a second communication port 325, in some cases, a wall opposite to the first sidewall 321 or other adjacent walls may be provided with a second communication port 325, and neither the wall adjacent to the first sidewall 321 nor the wall opposite to the first sidewall 321 faces the gap between the two support structures 32, so that the gas or the electrolyte, etc. flowing out through the second communication port 325 flows to the outside between the two support structures 32, and flows to the side portion of the body 31, and further flows to both sides of the main body 232.

Wherein the wall opposite to the first side wall 321, i.e. the second side wall 322 as shown in fig. 5, the second side walls 322 of the two support structures 32 are arranged facing away from each other. The walls adjacent to the first side wall 321 may comprise, in addition to the bottom wall 323, a top wall of the support structure 32 or a side wall arranged between the first side wall 321 and the second side wall 322.

It should be noted that the supporting structure may be a hollow structure, and the wall of the supporting structure is a structure surrounding the cavity; the support structure may also be a substantially solid structure provided with only the channels communicating the first communication port and the second communication port, in which case the walls of the support structure may be understood with reference to the faces of the support structure.

Alternatively, the total flow area of all the first communication ports 324 on both support structures 32 may be set to be greater than or equal to 0.6 times the pressure relief area of the pressure relief structure 212, e.g., the total flow area of all the first communication ports 324 on both support structures 32 may be 0.6 times, 0.7 times, 0.8 times, 0.9 times, 1 times, 1.2 times, etc. the pressure relief area of the pressure relief structure 212. Alternatively, the total flow area of all the second communication ports 325 on the two support structures 32 is greater than or equal to 0.6 times the pressure relief area of the pressure relief structure 212, for example, the total flow area of all the second communication ports 325 on the two support structures 32 may be 0.6 times, 0.7 times, 0.8 times, 0.9 times, 1 times, 1.2 times, etc. the pressure relief area of the pressure relief structure 212.

It can be understood that the larger the total flow area of the first communication port 324 and the second communication port 325 is, the more favorable the flow distribution of the electrolyte and the gas is, but the arrangement of the first communication port 324 and the second communication port 325 can affect the strength of the insulating protection member 30, and the limitation of the total flow area of the first communication port 324 and the total flow area of the second communication port 325 in this embodiment is not only favorable for improving the flow distribution effect of the electrolyte or the gas flow and improving the impact resistance of the battery, but also the insulating protection member 30 can still have a better supporting effect on the electrode assembly 23.

The pressure relief structure 212 may be located at a position between the two support structures 32, in particular in the middle of the body 31. The insulating protector 30 may be provided with a vent hole 33 corresponding to the pressure release structure 212, and when the electrolyte or air flow impacts the end cap 21 side of the battery cell 20 when the battery cell 20 falls or vibrates, the electrolyte or air flow impacts the insulating protector 30 and impacts the pressure release structure 212 through the vent hole 33. The force of the electrolyte or gas flow acting on the insulating protector 30 when striking the insulating protector 30 may also be transferred to the pressure relief structure 212, causing an impact to the pressure relief structure 212. In this embodiment, by providing the first communication port 324 and the second communication port 325 that are communicated with each other on the support structure 32 of the insulating protection member 30, when the battery cell 20 falls or vibrates to cause the electrolyte or the air flow to impact to the end cap 21, the electrolyte or the air flow can flow from the first communication port 324 of the support structure 32 to the second communication port, the electrolyte or the air flow is split to the side of the insulating protection member 30 and flows to the side of the electrode assembly 23, so that accumulation of the electrolyte or the air flow on the pressure release structure 212 is reduced, impact of the electrolyte or the air flow on the pressure release structure 212 is reduced, and thus, the possibility of leakage of the electrolyte due to falling or vibration of the battery cell 20 is reduced, and the impact resistance of the battery cell 20 is improved.

Optionally, according to some embodiments of the present application, a plurality of first communication ports 324 are provided on the support structure 32 at intervals, and/or a plurality of second communication ports 325 are provided on the support structure 32 at intervals.

Wherein, the plurality of first communication ports 324 may be disposed on the support structure 32, and the plurality of first communication ports 324 may be disposed at intervals along the length direction of the first sidewall 321, or may be disposed at intervals along the height direction of the first sidewall 321. The support structure 32 may be provided with a plurality of second communication ports 325, and in particular, the plurality of second communication ports 325 may be provided on the second sidewall 322 and spaced apart along the length direction of the second sidewall 322; the plurality of second communication ports 325 may be provided in the bottom wall 323, and the plurality of communication ports may be provided at intervals in the bottom wall 323.

The length direction of the first sidewall 321 is substantially parallel to the bottom wall 323, and in particular, it can be understood with reference to the first direction X shown in the drawings that the height direction Z of the first sidewall 321 is substantially perpendicular to the bottom wall 323 of the support structure 32. The length direction of the second side wall 322 is substantially the same as the length direction of the first side wall 321.

The support structure 32 is provided with the first communication ports 324 and/or the second communication ports 325 with a plurality of intervals, so that the flow area of the first communication ports 324 and/or the second communication ports 325 can be increased, which is beneficial to improving the flow distribution effect of the electrolyte or the air flow, thereby reducing the impact of the electrolyte or the air flow on the pressure release structure 212 when the battery cell 20 falls or vibrates. Meanwhile, compared with a larger and continuous first communication port 324 or second communication port 325, the first communication port 324 and/or the second communication port 325 have smaller influence on the strength of the support structure 32, which is beneficial to maintaining the support limiting effect of the support structure 32 on the electrode assembly 23 and reducing the possibility of the electrode assembly 23 moving or swaying in the housing 22.

Optionally, according to some embodiments of the present application, the number of all the first communication ports 324 on the two support structures 32 is not less than four, and/or the number of all the second communication ports 325 on the second side wall 322 of the two support structures 32 is not less than four, and the second side wall 322 is the wall of the support structure 32 opposite to the first side wall 321.

In the case where only one support structure 32 is provided with the first communication ports 324 and the second communication ports 325, the support structure 32 may be provided with four, five or more first communication ports 324 and four, five or more second communication ports 325. In the case where the first communication ports 324 are provided on both support structures 32, the number of the first communication ports 324 on both support structures 32 may be the same or different, and the sum of the number of the first communication ports 324 on one support structure 32 and the number of the first communication ports 324 on the other support structure 32 is four, five or more, and the sum of the number of the second communication ports 325 on the second side wall 322 on one support structure 32 and the number of the second communication ports 325 on the second side wall 322 on the other two support structures 32 is four, five or more.

The number of first communication ports 324 and the number of second communication ports 325 on one support structure 32 may be the same or different. The shape of the first communication port 324 may be the same as or different from the shape of the second communication port 325 on the second side wall 322. The two support structures 32 may be provided with the first communication ports 324 and the second communication ports 325, and the number of the first communication ports 324 on each support structure 32 may be not less than two, so that the total number of the first communication ports 324 of the two support structures 32 is not less than four; the second side wall 322 of each support structure 32 may be provided with not less than two second communication ports 325 such that the total number of the second communication ports 325 of the two support structures 32 is not less than four.

The number of the second communication ports 325 in the present embodiment is limited to the number of the second communication ports 325 on the second side wall 322, and is not limited to the number of the walls where the second communication ports 325 are provided adjacent to the first side wall 321, for example, the number of the second communication ports 325 on the bottom wall 323 is not within the number of the second communication ports 325 described above.

In a specific implementation manner, as shown in fig. 6 and 7, fig. 6 schematically illustrates a schematic diagram of an insulation protection piece according to some embodiments of the present application, fig. 7 schematically illustrates an enlarged a portion of fig. 6, support structures 32 at two ends of a body 31 are respectively provided with a first communication port 324 and a second communication port 325, three first communication ports 324 are spaced on each support structure 32, two second communication ports 325 are spaced on a second side wall 322 of each support structure 32, and each of the first communication ports 324 and the second communication ports 325 may be rectangular ports.

The support structure 32 of this embodiment is provided with the first communication ports 324 and/or the second communication ports 325 with a plurality of intervals, so that the air flow or the electrolyte can be split at a plurality of positions, which is beneficial to improving the splitting effect of the electrolyte or the air flow, thereby reducing the impact of the electrolyte or the air flow on the pressure release structure 212 when the battery cell 20 falls or vibrates.

Optionally, according to some embodiments of the present application, the total flow area of all the first communication ports 324 on both support structures 32 is greater than or equal to 1.2 times the relief area of the relief structure 212; and/or the total flow area of all the second communication ports 325 on both support structures 32 is greater than or equal to 1.2 times the relief area of the relief structure 212.

It will be appreciated that where only one support structure 32 of the two support structures 32 is provided with first and second communication ports 324, 325, the total flow area of all first communication ports 324 is the sum of the flow areas of all first communication ports 324 of that support structure 32, and the total flow area of all second communication ports 325 is the sum of the flow areas of all second communication ports 325, wherein all second communication ports 325 are all second communication ports 325 on the support structure 32, e.g., where second communication ports 325 are provided on both the wall adjacent to the first side wall 321 and the second side wall 322, all communication ports include both second communication ports 325 on the second side wall 322 and second communication ports 325 on the wall adjacent to the first side wall 321. In the case where the first communication ports 324 and the second communication ports 325 are provided in both support structures 32, the total flow area of all the first communication ports 324 is the sum of the flow area of all the first communication ports 324 on one of the support structures 32 and the flow area of all the first communication ports 324 on the other support structure 32, and the total flow area of all the second communication ports 325 is the sum of the flow area of all the second communication ports 325 on one of the support structures 32 and the flow area of all the second communication ports 325 on the other support structure 32.

The flow area of the first communication port 324 can be understood with reference to the flow cross-sectional area of the first communication port 324, and the flow cross-sectional area of the first communication port 324 is a cross-section perpendicular to the axial direction of the first communication port 324. The flow area of the second communication port 325 can be understood with reference to the flow cross-sectional area of the second communication port 325, the flow cross-section of the second communication port 325 being a cross-section perpendicular to the axial direction of the second communication port 325.

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 flow area of all the first communication ports 324 on both support structures 32 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 total flow area of all the second communication ports 325 on the two support structures 32 at the two ends of the body 31 of the first communication port 324 may be 1.2 times, 1.4 times, 1.6 times, 1.8 times, 2 times, 2.5 times, etc. the pressure release area of the pressure release structure 212.

The larger the total flow area of the first communication port 324 and the second communication port 325, the more advantageous the flow splitting of the electrolyte and the gas. The first communication ports 324 are limited in size by the first side walls 321, and the first side walls 321 need to have a certain supporting strength, so that the first side walls 321 cannot be completely hollowed out, and the total flow area of all the first communication ports 324 is generally smaller than the area of the first side walls 321. The second communication port 325 is limited by the size of the second side wall 322 and the surface adjacent to the first side wall 321, and the second side wall 322 and the surface adjacent to the first side wall 321 need to have a certain supporting strength, so the second side wall 322 and the wall adjacent to the first side wall 321 cannot be completely hollowed out, so the total flow area of the second communication port 325 is smaller than the area of the wall adjacent to the first side wall 321 and the second side wall 322. In short, the maximum value of the total flow area of all the first and second communication ports 324 and 325 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.

The limitation of the total flow area of the first communication port 324 and the total flow area of the second communication port 325 in this embodiment is beneficial to improving the flow dividing effect of the electrolyte or the air flow.

According to some embodiments of the present application, optionally, the supporting structure 32 abuts against the electrode assembly 23, a wall of the supporting structure 32 abutting against the electrode assembly 23 is a bottom wall 323, the bottom wall 323 is adjacent to and connected with the first side wall 321, and at least one second communication port 325 is provided on the bottom wall 323.

Wherein the bottom wall 323 abuts against the tip end of the main body 232 of the electrode assembly 23.

When the bottom wall 323 abuts against the main body 232 of the electrode assembly 23, a partial gap remains, and the electrolyte or gas flowing out of the second communication port 325 can flow to both sides of the main body 232 through the gap.

According to some embodiments of the present application, as shown in fig. 6 and 7, and further in conjunction with fig. 8 and 9, fig. 8 schematically illustrates a schematic view of an insulation protector according to some embodiments of the present application, fig. 9 is an enlarged view of portion B of fig. 8, optionally, the second communication port 325 on the bottom wall 323 is a circular hole 326, and the diameter of the circular hole 326 is 1/10 to 1/2 times the width dimension L3 of the bottom wall 323.

Wherein the bottom wall 323 has a length and a width, the length being greater than the width. In the present embodiment, the width direction of the bottom wall 323 can be understood with reference to the second direction Y in the drawing, and the length direction of the bottom wall 323 can be understood with reference to the first direction X in the drawing. The width dimension L3 of the bottom wall 323 is the distance between the opposite sides of the bottom wall 323 in the width direction.

Specifically, the diameter of the circular hole 326 is 1/10, 1/8, 1/5, 1/4, or 1/2 times the width dimension L3 of the bottom wall 323.

The circular hole 326 is not strictly required, and may be substantially circular. The circular holes 326 have less flow resistance and are easy to machine.

The size of the circular hole 326 in this embodiment is limited, so that the strength influence of the second communication port 325 on the bottom wall 323 can be reduced, so that the bottom wall 323 can maintain the spacing supporting effect on the electrode assembly 23.

Optionally, according to some embodiments of the present application, the circular aperture 326 has a diameter of 0.5 mm to 3 mm.

The width dimension L3 of the bottom wall 323 may be set to 5 mm to 15 mm. The diameter of the circular holes 326 may be specifically 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 3 mm. The size of the circular hole 326 may reduce the strength influence of the second communication port 325 on the bottom wall 323, so that the bottom wall 323 may maintain the spacing supporting effect on the electrode assembly 23.

Optionally, according to some embodiments of the present application, the total flow area of all the second communication ports 325 of the two support structures 32 located at the bottom wall 323 is greater than or equal to 0.5 times the pressure relief area of the pressure relief structure 212.

The total flow area of all the second communication openings 325 in the bottom wall 323 is the total flow area of the second communication openings 325 in the bottom wall 323 of one of the support structures 32 and the second communication openings 325 in the bottom wall 323 of the other support structure 32, as shown with reference to fig. 6 to 9, i.e. the sum of the flow areas of all the circular holes 326 in the two support structures 32.

Specifically, the total flow area of all the second communication ports 325 on the bottom wall 323 may be 0.5 times, 0.6 times, 1 time, etc. the pressure relief area of the pressure relief structure 212. The maximum value of the total flow area of all the second communication ports 325 on the bottom wall 323 is not greater than the area of the bottom wall 323.

The total flow area of all the second communication ports 325 on the bottom wall 323 of the present embodiment is limited, so that the strength influence of the second communication ports 325 on the bottom wall 323 can be reduced while the better flow dividing effect is achieved, and the bottom wall 323 can maintain the limit supporting function on the electrode assembly 23.

Optionally, according to some embodiments of the present application, referring to fig. 5, 6 and 7, the support structure 32 is a hollow structure, and the first communication port 324 and the second communication port 325 communicate through a cavity 328 inside the support structure 32.

The support structure 32 is a hollow structure, it being understood that the support structure 32 is provided with cavities 328 at least in part, which are not solid structures. The first sidewall 321 and the second sidewall 322 are disposed opposite each other on both sides of the cavity 328.

By arranging the supporting structure 32 to be a hollow structure, the weight of the insulating protection member 30 can be reduced, the lightweight design of the battery cell 20 is facilitated, the rigidity of the supporting structure 32 can be reduced due to the hollow structure, the integral deformation of the insulating protection member 30 is facilitated, and the possibility that the integral insulating protection member 30 is unexpectedly deformed due to the fact that the supporting structure 32 is difficult to deform due to overlarge deformation of the body 31 under certain conditions is reduced.

Optionally, according to some embodiments of the present application, as shown in fig. 5-7, the support structure 32 is provided with a stiffener 327 within the cavity 328.

The reinforcement 327 may be a plate or block. The reinforcement 327 may be connected to the bottom wall 323 of the support structure 32 or to a side wall of the support structure. The reinforcement 327 may be provided in one or more than one at intervals.

The reinforcement 327 can improve the strength of the support structure 32, so that the support structure 32 can still have better support performance when the support structure 32 is provided with the larger cavity 328, thereby improving the limit supporting effect of the insulating protector 30 on the electrode assembly 23 and reducing the possibility of the electrode assembly 23 moving or shaking in the housing 22.

Optionally, as shown in fig. 5-7, a stiffener 327 is connected between the first sidewall 321 and the second sidewall 322, the second sidewall 322 being the opposite wall of the support structure 32 from the first sidewall 321, according to some embodiments of the present application.

The reinforcement 327 may be provided in one or more than one along the extending direction of the first sidewall 321 or the second sidewall 322. The reinforcement 327 may be an integral structure with the support structure 32, and may specifically be an integrally formed structure. One end of the reinforcement 327 is connected to the first sidewall 321 and the other end is connected to the second sidewall 322, and the bottom side of the reinforcement 327 may also be connected to the bottom wall 323 of the support structure 32.

The reinforcement 327 is connected between the first sidewall 321 and the second sidewall 322, which is not easy to interfere with the communication between the first communication port 324 and the second communication port 325, and can improve the strength of the support structure 32, so that when the support structure 32 is provided with the larger cavity 328, the support structure can still have better support performance, the limit supporting effect of the insulation protection member 30 on the electrode assembly 23 is improved, and the possibility of the electrode assembly 23 moving or swaying in the casing 22 is reduced.

According to some embodiments of the present application, optionally, as shown in fig. 5 to 7, the reinforcement 327 divides the support structure 32 into a plurality of cavities 328, the first side wall 321 is provided with a first communication port 324 corresponding to the plurality of cavities 328, and the wall adjacent to the first side wall 321 and/or the second side wall 322 is provided with a second communication port 325 corresponding to the plurality of cavities 328, respectively.

The stiffener 327 may be a plate that is coupled to the bottom wall 323 of the support structure 32 and coupled to the first sidewall 321 and the second sidewall 322 to separate the support structure 32 into a plurality of relatively independent cavities 328. The first side wall 321 is disposed on the first communication ports 324 corresponding to the plurality of cavities 328, and it can be understood that the first side wall 321 surrounds a portion forming any one of the cavities 328 and is provided with the first communication ports 324, that is, any one of the cavities 328 is provided with the first communication port 324 communicated with the cavity 328. The walls adjacent to the first side wall 321 and/or the second side wall 322 are provided with second communication ports 325 corresponding to the plurality of cavities 328, respectively, and it is understood that the second side wall 322 encloses a portion forming any one of the cavities 328 and/or the walls adjacent to the first side wall 321 encloses a portion forming any one of the cavities 328, and is provided with the second communication ports 325, that is, any one of the cavities 328 is provided with the second communication ports 325 communicated with the cavity 328.

As shown in fig. 6 to 9, in some embodiments, a second communication port 325 is provided in a portion of the cavity 328 corresponding to the second side wall 322, and a second communication port 325 is provided in any one of the cavities 328 corresponding to the bottom wall 323 adjacent to the first side wall 321.

In this embodiment, the first communication port 324 and the second communication port 325 are disposed corresponding to each cavity 328, which is beneficial to improving the diversion effect of the electrolyte or the air flow.

Optionally, according to some embodiments of the present application, as shown in fig. 5 to 7, a side of the support structure 32 facing the end cap 21 is hollowed out.

The side of the support structure 32 facing the end cap 21, i.e. the top end of the support structure 32. The hollow arrangement of the top wall of the supporting structure 32 may be hollow in the position of the top wall of the supporting structure 32, or may be hollow in the whole top wall of the supporting structure 32, i.e. the hollow structure is equivalent to the whole top opening.

Specifically, the bottom wall 323 of the supporting structure 32 is a solid structure, and the top wall is a hollow design, so that the supporting strength of the supporting structure 32 can be maintained, the supporting structure 32 cannot be too high in hardness, the whole deformation of the insulating protection member 30 is facilitated, and meanwhile, the bottom wall 323 can be well pressed and fixed with the main body 232.

It will be appreciated that the support structure 32 is hollowed out on the side facing the end cap 21, so that the weight of the insulating protection member 30 can be reduced, which is beneficial to the lightweight design of the battery cell 20.

Optionally, as shown in fig. 5 to 7, the second side wall 322 of the support structure 32 is also provided with a second communication port 325, the second communication port 325 of the second side wall 322 is spaced from the end surface of the second side wall 322 facing the end cap 21, and the second side wall 322 is the wall of the support structure 32 opposite to the first side wall 321.

For convenience of description, the end surface of the second side wall 322 facing the end cap 21 is defined as a second end surface 3221, and the second communication port 325 of the second side wall 322 is spaced from the end surface of the second side wall 322 facing the end cap 21, and it is understood that the top end of the second communication port 325 on the second side wall 322 does not penetrate the top end of the second side wall 322 (i.e., the second end surface 3221), and the second side wall 322 reserves a supporting portion at the upper end of the second communication port 325, where the supporting portion is a portion of the second side wall 322 and is used for surrounding the upper end of the second communication port 325.

In this embodiment, the second communication port 325 on the second side wall 322 does not penetrate to the top end of the second side wall 322, so that the supporting structure 32 has better supporting strength, and the influence of the second communication port 325 on the strength of the second side wall 322 is reduced.

According to some embodiments of the present application, optionally, in a direction of the end cap 21 toward the electrode assembly 23, the second sidewall 322 has a size of L1, and a minimum distance between an end surface of the second sidewall 322 toward the end cap 21 and the second communication port 325 on the second sidewall 322 is L2, L2 being 1/10 to 1/4 times of L1.

The dimension L1 of the second side wall 322 along the direction of the end cap 21 toward the electrode assembly 23, that is, the dimension of the second side wall 322 along the height direction Z of the support structure 32, specifically, the extending dimension along the height direction Z of the support structure 32 between the top end of the second side wall 322 and the bottom end of the second side wall 322 is the same as or similar to the distance between the lower surface of the end cap 21 and the top end of the main body 232.

The minimum distance L2 between the end face (second end face 3221) of the second side wall 322 facing the end face of the end cap 21 and the second communication port 325 on the second side wall 322 is understood to be the thickness of the top edge of the second communication port 325 on the second side wall 322, that is, the minimum dimension of the support portion of the second side wall 322 reserved at the upper end of the second communication port 325 in the height direction Z of the support structure 32.

Specifically, L2 may be 1/10 times, 1/9 times, 1/8 times, 1/7 times, 1/5 times, 1/4 times of L1.

The present embodiment defines the dimension of the minimum distance between the end face (the second end face 3221) of the second side wall 322 facing the end cover 21 and the second communication port 325 on the second side wall 322, so that the second communication port 325 has a larger flow area, and the influence of the second communication port 325 on the strength of the second side wall 322 can be reduced.

Optionally, according to some embodiments of the present application, a minimum distance L2 between an end surface of the second side wall 322 facing the end cap 21 and the second communication port 325 on the second side wall 322 is 0.5 mm to 2 mm.

The dimension of the second sidewall 322 along the direction of the end cap 21 toward the electrode assembly 23 may be set according to the practical situation of the battery cell 20, and may specifically be set to 3 mm to 7 mm, for example, may be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or the like.

The minimum distance between the end face of the second side wall 322 facing the end cap 21 (second end face 3221) and the second communication port 325 on the second side wall 322 may be 0.5 mm, 1 mm, 1.4 mm, 1.5 mm, 2 mm.

The size of the minimum distance between the end surface of the second side wall 322 facing the end cover 21 and the second communication port 325 on the second side wall 322 is limited in this embodiment, so that the second communication port 325 has a larger flow area, and the influence of the second communication port 325 on the strength of the second side wall 322 can be reduced.

Optionally, according to some embodiments of the present application, as shown in fig. 5 to 7, the first sidewall 321 is disposed at a distance from the first communication port 324 toward the end surface of the end cap 21.

Wherein, for ease of understanding, an end surface of the first sidewall 321 facing the end cap 21 is defined as a first end surface 3211, and a dimension between the first end surface 3211 and the first communication port 324 may be the same as a thickness of the body 31.

The first sidewall 321 is disposed at a distance from the first communication port 324 toward the end face (first end face 3211) of the end cap 21, and it is understood that the top end of the first communication port 324 does not penetrate the top end of the first sidewall 321, and the first sidewall 321 reserves a supporting portion at the upper end of the first communication port 324, which is a portion of the first sidewall 321, and is disposed around the upper end of the first communication port 324.

In this embodiment, the second communication port 325 does not penetrate the top end of the first sidewall 321, so that the supporting structure 32 has better supporting strength, and the influence of the first communication port 324 on the strength of the first sidewall 321 is reduced.

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

The material of the supporting structure 32 and the material of the body 31 may be the same, and the supporting structure and the body 31 may be an integrated structure, or connected as an integrated structure.

The supporting structure 32 and the body 31 are integrated, so that the insulation protection piece 30 has high structural stability and connection strength.

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

Optionally, as shown in fig. 5, 6 and 8, the insulating protector 30 is provided with a vent hole 33 at a position corresponding to the pressure relief structure 212, according to some embodiments of the present application.

The position of the insulating protector 30 corresponding to the pressure relief structure 212 is understood to be a position of the insulating protector 30 directly under the pressure relief structure 212 or a position close to the directly under the pressure relief structure 212. The vent hole 33 may be provided in the body 31 and penetrate through the top and bottom walls 323 of the body 31, and a plurality of vent holes 33 may be provided.

When thermal runaway occurs in the battery cell 20, the exhaust in the battery cell 20 can flow to the pressure release structure 212 in time through the exhaust hole 33 to be discharged, so that the protection performance of the battery cell 20 against the thermal runaway is improved.

Optionally, as shown in fig. 5 and 6, according to some embodiments of the present application, the insulating protection member 30 further includes a protrusion structure 34 corresponding to the position of the pressure relief structure 212, the protrusion structure 34 is located on a side of the body 31 facing away from the end cap 21 and abuts against the electrode assembly, and the vent hole 33 includes a first vent hole 331 penetrating the body 31 and the protrusion structure 34.

The bump structure 34 may be made of the same material as the body 31. The protruding structure 34 may be an integral structure with the body 31, specifically may be an integral structure or a structure connected as one body. The protrusion structure 34 may enhance the strength of the insulation protector 30, and improve the limit support performance of the insulation protector 30 to the electrode assembly 23.

The first exhaust hole 331 may be provided in plurality at intervals. For example, the protrusion structure 34 extends in the width direction (which may be understood with reference to the first direction X) of the body 31, and a plurality of first exhaust holes 331 may be disposed at intervals in the extending direction of the protrusion structure 34, and each of the first exhaust holes 331 may be arranged in a bar shape.

The protrusion structure 34 may be a hollow protrusion with an open upper end, and the hollow space of the protrusion structure 34 may be provided with a reinforcing rib 35. A second vent 332 may also be provided on the body 31 around the periphery of the raised structure 34 to increase the flow area of the effluent within the cell 20 through the insulating protector 30.

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 9, 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 cover 21 covers the opening, a pressure relief structure 212 is arranged on the end cover 21, and 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, two opposite ends of the body 31 are respectively connected with a supporting structure 32, the supporting structure 32 is abutted against the electrode assembly 23, one side of the supporting structure 32, which is away from the end cover 21, is arranged in a protruding mode relative to the body 31, the supporting structures 32 at two ends of the body 31 are provided with first side walls 321 facing each other, the first side walls 321 of the supporting structures 32 at two ends are respectively provided with a first communication port 324, the second side walls 322 and the bottom wall 323 of the supporting structures 32 at two ends are respectively provided with a second communication port 325, and the first communication ports 324 and the second communication ports 325 of the same supporting structure 32 are communicated. The first side wall 321 is disposed at intervals between the end face of the end cover 21 and the first communication openings 324, the number of all the first communication openings 324 on the two support structures 32 at two ends of the body 31 is not less than four, and the total flow area of all the first communication openings 324 on the two support structures 32 at two ends of the body 31 is greater than or equal to 1.2 times the pressure release area of the pressure release structure 212. The second side wall 322 is a wall of the support structure 32 opposite to the first side wall 321, a plurality of second communication ports 325 can be arranged on the second side wall 322 at intervals, the second communication ports 325 of the second side wall 322 and the end face of the second side wall 322 facing the end cover 21 are arranged at intervals, and the minimum distance between the end face of the second side wall 322 facing the end cover 21 and the second communication ports 325 on the second side wall 322 along the direction of the end cover 21 facing the electrode assembly 23 is 0.5 mm to 2 mm. The second side walls 322 of the supporting structures 32 are provided with second communication ports 325, the number of all second communication ports 325 on the second side walls 322 of the two supporting structures 32 is not less than four, and the total flow area of all second communication ports 325 on the two supporting structures 32 at two ends of the body 31 is greater than or equal to 1.2 times of the pressure release area of the pressure release structure 212. The bottom wall 323 can be provided with a plurality of second communication ports 325 at intervals, the second communication ports 325 can be circular holes 326, the diameter of each circular hole 326 is 0.5 mm to 3 mm, and the total flow area of all the second communication ports 325 on the bottom wall 323 is greater than or equal to 0.5 times the pressure release area of the pressure release structure 212.

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

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, the opposite ends of the body are respectively connected with a supporting structure, one side of the supporting structure deviating from the end cover is arranged in a protruding mode relative to the body, the two supporting structures at the two ends of the body are provided with first side walls facing each other, the supporting structures are also provided with bottom walls facing the electrode assembly, the bottom walls of the supporting structures are adjacent to and connected with the first side walls, a first communication port is formed in the first side wall of the supporting structure at least at one end, a second communication port communicated with the first communication port is formed in the supporting structure, and the second communication port is at least arranged on the bottom walls of the supporting structure.

2. The battery cell of claim 1, wherein the support structure is provided with a plurality of first communication ports at intervals, and/or the support structure is provided with a plurality of second communication ports at intervals.

3. The battery cell of claim 2, wherein the number of all of the first communication ports on both of the support structures is not less than four;

and/or the second side walls of the supporting structures are also provided with the second communication ports, the number of all the second communication ports of the two supporting structures, which are positioned on the second side walls, is not less than four, and the second side walls are walls of the supporting structures, which are opposite to the first side walls.

4. The battery cell of claim 1, wherein a total flow area of all the first communication ports on both support structures is greater than or equal to 1.2 times a relief area of the relief structure;

and/or the total flow area of all the second communication ports on the two supporting structures is greater than or equal to 1.2 times of the pressure relief area of the pressure relief structure.

5. The battery cell of claim 1, wherein the bottom wall abuts the electrode assembly.

6. The battery cell according to claim 1, wherein the second communication port on the bottom wall is a circular hole having a diameter 1/10 to 1/2 times the width dimension L3 of the bottom wall.

7. The battery cell of claim 6, wherein the circular aperture has a diameter of 0.5 mm to 3 mm.

8. The battery cell of claim 5, wherein a total flow area of all the second communication ports of the two support structures at the bottom wall is greater than or equal to 0.5 times a pressure relief area of the pressure relief structure.

9. The battery cell of any one of claims 1-8, wherein the support structure is a hollow structure, and the first communication port and the second communication port communicate through a cavity inside the support structure.

10. The battery cell of claim 9, wherein the support structure is provided with a stiffener within the cavity.

11. The battery cell of claim 10, wherein the reinforcement is connected between the first sidewall and a second sidewall, the second sidewall being an opposite wall of the support structure from the first sidewall.

12. The battery cell according to claim 11, wherein the reinforcement divides the support structure into a plurality of cavities, the first side wall is provided with the first communication port corresponding to the plurality of cavities, and the wall adjacent to the first side wall and/or the second side wall is provided with the second communication port corresponding to the plurality of cavities, respectively.

13. The battery cell of claim 9, wherein the support structure is hollowed out on a side facing the end cap.

14. The battery cell of any one of claims 1-8, wherein the second side wall of the support structure is also provided with the second communication port, the second communication port of the second side wall being spaced from an end face of the second side wall facing the end cap, the second side wall being a wall of the support structure opposite the first side wall.

15. The battery cell of claim 14, wherein the second sidewall has a dimension L1 in a direction of the end cap toward the electrode assembly, and a minimum distance between an end face of the second sidewall toward the end cap and the second communication port on the second sidewall is L2, L2 being 1/10 to 1/4 times L1.

16. The battery cell of claim 15, wherein a minimum distance L2 between an end surface of the second sidewall facing the end cap and the second communication port on the second sidewall is 0.5 millimeters to 2 millimeters.

17. The battery cell of any one of claims 1-8, wherein the end surface of the first sidewall facing the end cap is spaced from the first communication port.

18. The battery cell of any one of claims 1-8, wherein the body is of unitary construction with the support structure.

19. The battery cell of any one of claims 1-8, wherein the body and the support structure are plastic pieces.

20. The battery cell according to any one of claims 1 to 8, wherein the insulating protector is provided with a vent hole at a position corresponding to the pressure release structure.

21. The battery cell of claim 20, wherein the insulating protection further comprises a raised structure corresponding to the location of the pressure relief structure, the raised structure being located on a side of the body facing away from the end cap and abutting the electrode assembly, the vent comprising a first vent hole extending through the body and the raised structure.

22. A battery comprising the battery cell of any one of claims 1-21.

23. An electrical device comprising the battery of claim 22 for providing electrical energy.