CN112018301B

CN112018301B - Battery, electric equipment, method and equipment for preparing battery

Info

Publication number: CN112018301B
Application number: CN202011120263.8A
Authority: CN
Inventors: 吴凯; 孙占宇; 黄小腾; 胡浪超; 杨海奇; 洪家荣; 汪文礼
Original assignee: Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2021-03-26
Anticipated expiration: 2040-10-19
Also published as: CN112909398A; CN112018301A; CN112909398B

Abstract

The embodiment of the application relates to a battery, electric equipment, a method and equipment for preparing the battery. The battery includes: the first battery cell comprises a pressure relief mechanism, the pressure relief mechanism is arranged on a first wall of the first battery cell, and the pressure relief mechanism is used for actuating to relieve the internal pressure when the internal pressure or the temperature of the first battery cell reaches a threshold value; a fire conduit for containing a fire-fighting medium and for discharging the fire-fighting medium toward the first wall upon actuation of the pressure relief mechanism; the blocking component protrudes out of the first wall along a first direction, the first direction is a direction perpendicular to the first wall, and the blocking component is used for blocking the fire fighting medium discharged from the fire fighting pipeline from flowing from the first battery cell to the second battery cell. The battery, the electric equipment, the method for preparing the battery and the equipment can improve the safety performance of the battery.

Description

Battery, electric equipment, method and equipment for preparing battery

Technical Field

The present application relates to the field of energy storage devices, and in particular, to a battery, an electrical device, a method of manufacturing a battery, and an apparatus.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry. Under such circumstances, electric vehicles are an important component of sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the case of electric vehicles, battery technology is an important factor in the development thereof.

In addition to improving the performance of batteries, safety issues are also a considerable problem in the development of battery technology. If the safety problem of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem to be solved urgently in the battery technology.

Disclosure of Invention

The application provides a battery, electric equipment, a method and equipment for preparing the battery, which can improve the safety performance of the battery.

In a first aspect, a battery is provided, the battery comprising: the battery pack comprises a plurality of battery monomers, a first battery monomer and a second battery monomer, wherein the first battery monomer comprises a pressure relief mechanism, the pressure relief mechanism is arranged on a first wall of the first battery monomer, and the pressure relief mechanism is used for actuating to relieve the internal pressure when the internal pressure or the temperature of the first battery monomer reaches a threshold value; a fire conduit for containing a fire-fighting medium and for discharging the fire-fighting medium toward the first wall upon actuation of the pressure relief mechanism; the blocking component protrudes out of the first wall along a first direction, the first direction is a direction perpendicular to the first wall, and the blocking component is used for blocking the fire-fighting medium discharged from the fire fighting pipeline from flowing from the first battery cell to the second battery cell.

The battery of the embodiment of the application can comprise a plurality of battery cells, wherein at least part of the battery cells are provided with a pressure relief mechanism so as to actuate to relieve the internal pressure or temperature when the internal pressure or temperature of the battery cells reaches a threshold value; meanwhile, a fire fighting pipeline for containing fire fighting media can be arranged outside the single battery and at a position corresponding to the pressure relief mechanism, so that the fire fighting pipeline is damaged when the pressure relief mechanism is actuated, the fire fighting pipeline can discharge the fire fighting media to the single battery from a damaged area through the pressure relief mechanism, and therefore the temperature is lowered and the single battery is cooled timely; in addition, to arbitrary two adjacent battery monomer, can set up barrier member, this barrier member is convex for the surface of the wall at two adjacent battery monomer's pressure release mechanism place to can effectively prevent to flow to adjacent battery monomer from the battery monomer that takes place thermal runaway from the fire control medium that the fire control pipeline flows out, and then reduce the possibility that takes place the short circuit between a plurality of battery monomer, improve the security performance of battery.

In some embodiments, a portion of the blocking member is sandwiched between a second wall of the first cell and a second wall of the second cell, both the second wall of the first cell and the second wall of the second cell being perpendicular to the first wall.

For example, the blocking member may include a first portion protruding from the first wall in the first direction and a second portion sandwiched between the second wall of the first battery cell and the second wall of the second battery cell.

Install the partly centre gripping of barrier member between two adjacent battery monomer, compare in the surface with barrier member snap-on at first wall, the installation is simpler, and fixed effect is better.

In some embodiments, both ends of the blocking member in the first direction respectively exceed corresponding ends of the electrode assembly of the first battery cell, and/or both ends of the blocking member in the first direction respectively exceed corresponding ends of the electrode assembly of the second battery cell.

The second part can be arranged between two opposite walls of the two battery cells, so that the heat insulation effect is achieved, and the influence of the battery cells in thermal runaway on the adjacent battery cells is reduced.

In some embodiments, the blocking member is attached to the second wall of the first battery cell and/or the second wall of the second battery cell by a connector.

For example, the connector may be a structural adhesive.

In some embodiments, the battery further comprises: and a spacer member interposed between the second wall of the first battery cell and the second wall of the second battery cell, the spacer member being located on one side of the stopper member in the first direction and abutting against an end of the stopper member.

In some embodiments, both ends of the separation member in the first direction respectively exceed corresponding ends of the electrode assembly of the first battery cell, and/or both ends of the separation member in the first direction respectively exceed corresponding ends of the electrode assembly of the second battery cell.

The isolating component can effectively block heat between two adjacent battery monomers, and reduce the influence of the battery monomer with thermal runaway on the adjacent battery monomers.

In some embodiments, the barrier member has a melting point higher than a melting point of the isolation member.

In some embodiments, the barrier component has a melting point greater than or equal to 500 ℃.

Because the temperature of the discharge of the pressure relief mechanism is high, the barrier member should be selected from a material with a high melting point to prevent the barrier member from melting.

In some embodiments, the barrier member has a hardness greater than a hardness of the isolation member.

The barrier component should select the material that is difficult to take place deformation, like this, when free pressure release structure of battery actuates, the barrier component can prevent that the granule from splashing to adjacent battery monomer by this battery monomer, and then prevents the short circuit.

In some embodiments, a first battery cell group and a second battery cell group of the plurality of battery cells are arranged in parallel along a second direction, the second direction is perpendicular to the first direction, the first battery cell group includes at least two first battery cells arranged in parallel along a third direction, the second battery cell group includes at least two second battery cells arranged in parallel along the third direction, and the third direction is perpendicular to the first direction and the second direction.

In some embodiments, the area of the second wall of the first battery cell is less than the area of the surface of the third wall of the first battery cell, the area of the second wall of the second battery cell is less than the area of the surface of the third wall of the second battery cell, the second wall of the first battery cell and the second wall of the second battery cell are both perpendicular to the second direction, and the third wall of the first battery cell and the third wall of the second battery cell are both perpendicular to the third direction.

In some embodiments, the first battery cell stack and the second battery cell stack correspond to an integral barrier member.

In some embodiments, the first electrode terminal of the first battery cell is disposed on the first wall of the first battery cell and protrudes from the first wall of the first battery cell along the first direction; the second electrode terminal of the second battery cell is arranged on the first wall of the second battery cell and protrudes out of the first wall of the second battery cell along the first direction, and the first wall of the second battery cell is a wall where a pressure relief mechanism included in the second battery cell is located; the first electrode terminal and the second electrode terminal are opposite in polarity and are adjacently disposed along the second direction.

In some embodiments, the barrier member protrudes from the first electrode terminal and/or the second electrode terminal in the first direction.

In some embodiments, the battery further comprises: the first bus bar component is used for connecting a first electrode terminal of the first battery cell, and the blocking component protrudes or is flush with the first bus bar component along the first direction; and/or a second bus member for connecting the second electrode terminals of the second battery cells, the blocking member protruding from or being flush with the second bus member in the first direction.

In a second aspect, there is provided an electrical device comprising: a battery according to the first aspect or any embodiment of the first aspect.

In some embodiments, the powered device is a vehicle, a watercraft, or a spacecraft.

In a third aspect, a method for preparing a battery is provided, comprising: providing a plurality of battery cells, wherein the plurality of battery cells comprise a first battery cell and a second battery cell which are adjacent to each other, the first battery cell comprises a pressure relief mechanism, the pressure relief mechanism is arranged on a first wall of the first battery cell, and the pressure relief mechanism is used for being actuated to relieve the internal pressure when the internal pressure or the temperature of the first battery cell reaches a threshold value; providing a fire conduit for containing a fire-fighting medium and for discharging the fire-fighting medium toward the first wall upon actuation of the pressure relief mechanism; providing a blocking member protruding from the first wall along a first direction, the first direction being a direction perpendicular to the first wall, the blocking member being configured to block the fire fighting medium discharged from the fire fighting pipeline from flowing from the first battery cell to the second battery cell.

In a fourth aspect, there is provided an apparatus for preparing a battery, comprising means for performing the method of the third aspect described above.

Drawings

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application;

fig. 3 is a schematic structural view of a battery module according to an embodiment of the present application;

fig. 4 is an exploded view of a battery cell according to an embodiment of the present application;

FIG. 5 is a schematic view of another embodiment of a battery of the present application;

fig. 6 is a schematic view of another structure of a battery according to an embodiment of the present application;

FIG. 7 is an enlarged view of a portion of area A of FIG. 6;

fig. 8 is an exploded view of a battery according to an embodiment of the present application;

fig. 9 is a schematic view of a plurality of battery cells included in the battery according to the embodiment of the present application;

fig. 10 is a side view of a plurality of battery cells included in a battery of an embodiment of the present application;

FIG. 11 is a schematic view of a barrier component of an embodiment of the present application;

fig. 12 is another schematic view of a plurality of battery cells included in a battery according to an embodiment of the present disclosure;

FIG. 13 is a possible cross-sectional view along the direction B-B of FIG. 12;

FIG. 14 is a view in section along the direction C-C of FIG. 9;

FIG. 15 is a schematic view of a barrier component and a spacer component of an embodiment of the present application;

FIG. 16 is another possibility of a cross-sectional view along the direction C-C of FIG. 9;

FIG. 17 is another possibility of a cross-sectional view along the direction C-C of FIG. 9;

fig. 18 is a schematic flow chart of a method of manufacturing a battery according to an embodiment of the present application;

fig. 19 is a schematic block diagram of an apparatus for manufacturing a battery according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope 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 in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the diaphragm can be PP or PE, etc. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto. The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the safety of the battery.

For cells, the main safety hazard comes from the charging and discharging processes, and at the same time, with a suitable ambient temperature design, there are generally at least three protective measures for the cells in order to effectively avoid unnecessary losses. In particular, the protective measures comprise at least a switching element, selection of a suitable isolating membrane material and a pressure relief mechanism. The switching element is an element that can stop charging or discharging the battery when the temperature or resistance in the battery cell reaches a certain threshold value. The isolating membrane is used for isolating the positive plate and the negative plate, and can automatically dissolve away the micron-scale (even nano-scale) micropores attached to the isolating membrane when the temperature rises to a certain value, so that metal ions cannot pass through the isolating membrane, and the internal reaction of the battery monomer is stopped.

The pressure relief mechanism refers to an element or a component that is actuated to relieve the internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte and the separator in the battery cell. The pressure relief mechanism may take the form of, for example, an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and may specifically employ a pressure-sensitive or temperature-sensitive element or configuration, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold value, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage through which the internal pressure or temperature can be relieved.

As used herein, "activate" means that the pressure relief mechanism is activated or activated to a certain state, such that the internal pressure and temperature of the battery cell are relieved. The actions generated by the pressure relief mechanism may include, but are not limited to: at least a portion of the pressure relief mechanism ruptures, fractures, is torn or opened, or the like. When the pressure relief mechanism is actuated, high-temperature and high-pressure substances in the battery cells are discharged outwards from the actuated part as emissions. In this way, the cells can be vented under controlled pressure or temperature, thereby avoiding potentially more serious accidents.

Reference herein to emissions from the battery cell includes, but is not limited to: electrolyte, dissolved or split anode and cathode pole pieces, fragments of a separation film, high-temperature and high-pressure gas generated by reaction, flame and the like.

The pressure relief mechanism on the battery cell has an important influence on the safety of the battery. For example, when a short circuit or overcharge occurs, thermal runaway may occur inside the battery cell, and the pressure or temperature may suddenly rise. In this case, the internal pressure and temperature can be released outwards by the actuation of the pressure relief mechanism, so as to prevent the explosion and the fire of the battery cells.

In current designs of pressure relief mechanisms, there is a major concern about releasing high pressure and heat inside the battery cell, i.e., discharging the emissions outside the battery cell. The high-temperature, high-pressure effluent is discharged in the direction of the cell in which the pressure relief mechanism is provided, and may more specifically be discharged in the direction of the region in which the pressure relief mechanism is actuated, and the force and destructive power of such an effluent may be great, and may even be sufficient to break through one or more structures in that direction, creating a safety issue. In addition, high voltage and high heat inside the battery cell may be continuously generated after thermal runaway occurs inside the battery cell, resulting in continuous potential safety hazards.

To the above problem, a fire fighting system can be arranged in the box body of the battery, and a fire fighting pipeline of the fire fighting system is arranged above the wall of the battery monomer, which is provided with the pressure relief mechanism. When the pressure relief mechanism is actuated, the fire-fighting pipeline discharges fire-fighting media, so that the temperature of emissions discharged from the pressure relief mechanism can be reduced, and the dangerousness of the emissions is reduced; the fire-fighting medium can further flow into the battery monomer through the pressure relief mechanism after actuating to further cool down the battery monomer, strengthen the security of battery. For example, the fire fighting pipe may be damaged by the exhaust from the battery cell when the pressure relief mechanism is activated, so that the fire fighting medium in the fire fighting pipe is exhausted.

The fire fighting pipe in the embodiment of the present application is used for containing a fire fighting medium, where the fire fighting medium may be a fluid, which may be a liquid or a gas. In case the pressure relief mechanism does not damage the fire fighting pipeline, no substance can be contained in the fire fighting pipeline, and in case the pressure relief mechanism is actuated, so that the fire fighting medium is contained in the fire fighting pipeline, for example, the fire fighting medium can be controlled to enter the fire fighting pipeline through the switch valve. Or, under the condition that the pressure relief mechanism is not damaged, the fire fighting pipeline can also contain fire fighting media all the time, and the fire fighting media can also be used for adjusting the temperature of the battery cells. The adjusting of the temperature means heating or cooling of the plurality of battery cells. In the case of cooling or temperature reduction of the battery cells, the fire fighting pipe is used for accommodating a cooling fluid to reduce the temperature of the plurality of battery cells, and in this case, the fire fighting pipe may also be referred to as a cooling component, a cooling system, a cooling pipe, or the like, and the fire fighting medium accommodated therein may also be referred to as a cooling medium or a cooling fluid, and more specifically, may be referred to as a cooling liquid or a cooling gas. Optionally, the fire-fighting medium may be circulated to achieve better temperature regulation. Optionally, the fire-fighting medium may be water, a mixture of water and glycol, or air, etc.

The box of the battery in the embodiment of the application is used for accommodating a plurality of battery single cells, a bus bar component and other components of the battery. In some embodiments, a structure for fixing the battery cell may be further provided in the case. The shape of the case may be determined according to the number of battery cells accommodated. In some embodiments, the box may be square, having six walls.

The bus bar member is used to electrically connect a plurality of battery cells, for example, in parallel or in series-parallel, to form a higher voltage output. The bus member may achieve electrical connection between the battery cells by connecting electrode terminals of the battery cells. In some embodiments, the bus member may be fixed to the electrode terminals of the battery cells by welding. The electrical connection formed by the bus members may also be referred to as a "high voltage connection".

In addition to the bus bar member, a sensing device for sensing the state of the battery cell may be provided in the battery. In embodiments of the present application, the electrical connections within the cell may include electrical connections formed by the bus members and/or electrical connections in the sensing device.

A pressure balance mechanism can be arranged on the box body of the battery and used for balancing the pressure inside and outside the box body. For example, when the pressure inside the tank is higher than the pressure outside the tank, the gas inside the tank may flow outside the tank through the pressure balancing mechanism; when the pressure in the box body is lower than the pressure outside the box body, the gas outside the box body can flow into the box body through the pressure balancing mechanism.

It should be understood that the components in the case of the battery described above should not be construed as limiting the embodiments of the present application, that is, the case for the battery of the embodiments of the present application may or may not include the components described above.

The technical scheme described in the embodiment of the application is applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecrafts and the like, and the spacecrafts comprise airplanes, rockets, space shuttles, spacecrafts and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described devices, but may also be applied to all devices using batteries, and for brevity of description, the following embodiments are all described by taking an electric vehicle as an example.

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to an embodiment of the present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1 instead of or in part of fuel or natural gas to provide driving power to the vehicle 1.

In order to meet different power requirements, the battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. The battery may also be referred to as a battery pack. Alternatively, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted.

For example, as shown in fig. 2, the battery 10 may include a plurality of battery cells 20 for a structural schematic diagram of the battery 10 according to an embodiment of the present disclosure. The battery 10 may further include a case having a hollow structure therein, and the plurality of battery cells 20 are accommodated in the case. As shown in fig. 2, the case may include two parts, which are referred to herein as a first case 111 (upper case) and a second case 112 (lower case), respectively, and the first case 111 and the second case 112 are snapped together. The shape of the first case 111 and the second case 112 may be determined according to the shape of the combination of the plurality of battery cells 20, and the first case 111 and the second case 112 may each have one opening. For example, each of the first casing 111 and the second casing 112 may be a hollow rectangular parallelepiped and only one surface of each of the first casing 111 and the second casing 112 may be an open surface, the opening of the first casing 111 and the opening of the second casing 112 are oppositely disposed, and the first casing 111 and the second casing 112 are fastened to each other to form a casing having a closed chamber. The plurality of battery cells 20 are connected in parallel or in series-parallel combination and then are placed in a box formed by buckling the first box 111 and the second box 112.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the box body by the conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.

The number of the battery cells 20 may be set to any number according to different power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power. Since the number of the battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for convenience of installation, each group of the battery cells 20 constituting a battery module. The number of the battery cells 20 included in the battery module is not limited and may be set as required. For example, fig. 3 is an example of a battery module. The battery may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel.

The following is a detailed description of any one of the battery cells. Fig. 4 is a schematic structural diagram of a battery cell 20 according to an embodiment of the present disclosure, where the battery cell 20 includes one or more electrode assemblies 22, a case 211, and a cover plate 212. The coordinate system shown in fig. 4 is the same as that in fig. 3. The housing 211 and cover 212 form a housing or battery compartment 21. The wall of the housing 211 and the cover plate 212 are referred to as the wall of the battery cell 20. The case 211 is determined according to the shape of one or more electrode assemblies 22 after being combined, for example, the case 211 may be a hollow rectangular parallelepiped or a square or a cylinder, and one of the faces of the case 211 has an opening so that one or more electrode assemblies 22 can be placed in the case 211. For example, when the housing 211 is a hollow rectangular parallelepiped or square, one of the planes of the housing 211 is an open plane, i.e., the plane has no wall body so that the housing 211 communicates inside and outside. When the housing 211 may be a hollow cylinder, the end surface of the housing 211 is an open surface, i.e., the end surface has no wall body so that the housing 211 is communicated with the inside and the outside. The cap plate 212 covers the opening and is connected with the case 211 to form a closed cavity in which the electrode assembly 22 is placed. The case 211 is filled with an electrolyte, such as an electrolytic solution.

Optionally, the battery cell 20 in the embodiment of the present application may further include a protective film disposed on an outer surface of the housing 211, for example, the protective film may be a blue film, and the blue film may be used to wrap the housing 211, and mainly plays a role of insulation. The material of the blue film can be at least one of the following materials: polyethylene terephthalate (PET), Polyethylene (PE), and polypropylene (PP), but the examples of the present application are not limited thereto.

The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be disposed on the cap plate 212. The cap plate 212 is generally in the shape of a flat plate, and two electrode terminals 214 are fixed to the flat plate surface of the cap plate 212, the two electrode terminals 214 being a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. One connecting member 23, which may also be referred to as a current collecting member, is disposed at each of the electrode terminals 214, between the cap plate 212 and the electrode assembly 22, for electrically connecting the electrode assembly 22 and the electrode terminals 214.

As shown in fig. 4, each electrode assembly 22 has a first tab 221a and a second tab 222 a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tab 221a of one or more electrode assemblies 22 is connected with one electrode terminal by one connecting member 23, and the second tab 222a of one or more electrode assemblies 22 is connected with the other electrode terminal by the other connecting member 23. For example, the positive electrode terminal 214a is connected to a positive electrode tab through one connecting member 23, and the negative electrode terminal 214b is connected to a negative electrode tab through the other connecting member 23.

In the battery cell 20, the electrode assembly 22 may be provided singly or in plurality according to actual use requirements, and as shown in fig. 4, 4 independent electrode assemblies 22 are provided in the battery cell 20.

The battery cell 20 may further include a pressure relief mechanism 213. The pressure relief mechanism 213 is actuated to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

The pressure relief mechanism 213 may be any of various possible pressure relief structures, which are not limited in the embodiments of the present application. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and/or, pressure relief mechanism 213 may be a pressure sensitive pressure relief mechanism configured to rupture when the internal air pressure of battery cell 20 in which pressure relief mechanism 213 is disposed reaches a threshold value.

Considering that high-temperature emissions can be discharged when the pressure relief mechanism is actuated, in order to reduce the damage of the emissions to other structures, a fire-fighting system can be arranged above the wall of the battery cell, on which the pressure relief mechanism is arranged, and when the pressure relief mechanism is actuated, the emissions discharged from the battery cell pass through and damage a fire-fighting pipeline in the fire-fighting system, so that fire-fighting media in the fire-fighting pipeline cool the emissions discharged from the pressure relief mechanism, the risk of the emissions is reduced, and the safety of the battery can be enhanced.

For a battery cell which is in thermal runaway, when a pressure relief mechanism of the battery cell is actuated, discharged emissions are sprayed out of a fire fighting pipeline in a flaring shape, so that the fire fighting pipeline with a large area is likely to be damaged, a large amount of fire fighting medium flows out, that is, the fire fighting medium not only flows to the battery cell with thermal runaway but also flows to other battery cells adjacent to the battery cell with thermal runaway, and the fire fighting medium is usually conductive, so that insulation failure between the battery cell with thermal runaway and the adjacent battery cell is caused, a short circuit is caused, and particularly when a voltage difference between two battery cells is large, a fire striking phenomenon is likely to be caused; moreover, when thermal runaway of the battery cell occurs, the blue films of the adjacent battery cells are melted, and insulation between the runaway battery cell and the adjacent battery cells is failed. Therefore, the embodiment of the present application provides a battery, which can solve the above problems.

Specifically, fig. 5 shows another schematic diagram of the battery 10 according to the embodiment of the present application, fig. 6 is a schematic diagram of the battery 10 shown in fig. 5 when only a part of the battery cell is shown, fig. 7 is a partially enlarged view of a region a in fig. 6, and fig. 8 is a partially exploded view of fig. 6. As shown in fig. 5 to 8, the battery 10 includes: a plurality of battery cells 20, any two adjacent battery cells in the plurality of battery cells 20 are referred to as a first battery cell 201 and a second battery cell 202, the first battery cell 201 includes a pressure relief mechanism 213, the pressure relief mechanism 213 may be disposed on any wall of the first battery cell 201, a wall where the pressure relief mechanism 213 is located is referred to as a first wall 2011, that is, the pressure relief mechanism is disposed on the first wall 2011 of the first battery cell, for example, as shown in fig. 5 to 8, in this embodiment of the application, the first wall 2011 is described as an example of a cover plate of the battery cell 20. The pressure relief mechanism 213 is configured to be activated to relieve the internal pressure or temperature of the first battery cell 201 when the internal pressure or temperature reaches a threshold value.

It should be understood that the battery 10 of fig. 5-8 may correspond to the battery 10 of fig. 2 and be applicable to the description of the battery 10 of fig. 2, for example, the battery 10 of fig. 5-8 may also include a case or the like; the battery cell 20 included in the battery 10 shown in fig. 5 to 8 may correspond to the battery cell 20 shown in fig. 3 and 4, and is applicable to the description of the battery cell 20 shown in fig. 3 and 4, for example, the pressure relief mechanism 213 included in the battery cell 20 shown in fig. 5 to 8 may correspond to the pressure relief mechanism 213 shown in fig. 4, and for brevity, no further description is provided here.

In addition, as shown in fig. 5 to 8, the battery 10 may further include: a fire conduit 13, the fire conduit 13 for containing a fire-fighting medium, and the fire conduit 13 for discharging the fire-fighting medium towards the first wall 2011 of the first battery cell upon actuation of the pressure relief mechanism 213; the blocking member 14 protrudes from the first wall 2011 along a first direction, i.e., an outer surface of the first wall 2011 away from an interior of the battery cell 20, the first direction is a direction perpendicular to the first wall 2011, and the blocking member 14 is configured to block the fire-fighting medium discharged from the fire fighting pipeline 13 from flowing from the first battery cell 201 to the second battery cell 202.

Therefore, the battery 10 in the embodiment of the present application may include a plurality of battery cells 20, and at least one battery cell 20 of the plurality of battery cells 20 is provided with a pressure relief mechanism 213 so as to be actuated to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value; meanwhile, a fire fighting pipeline 13 for containing a fire fighting medium can be arranged outside the battery cell 20 and at a position corresponding to the pressure relief mechanism 213, so that the fire fighting pipeline 13 can be damaged when the pressure relief mechanism 213 is actuated, and the fire fighting pipeline 13 can discharge the fire fighting medium from a damaged area to the battery cell 20 through the pressure relief mechanism 213, thereby cooling the battery cell in time; in addition, for any two adjacent battery cells 20, the blocking member 14 may be disposed, and the blocking member 14 protrudes from the outer surface of the wall where the pressure relief mechanism 213 of the two adjacent battery cells 20 is located, so that a fire-fighting medium can be effectively prevented from flowing from the battery cell 20 where thermal runaway occurs to the adjacent battery cell, the possibility of short circuit among the plurality of battery cells 20 is reduced, and the safety performance of the battery is improved.

Alternatively, the fire fighting pipe 13 in the embodiment of the present application may be provided in any shape according to the actual application. For example, the cross-sectional shape of the fire fighting pipe 13 may be set to any shape according to the actual application. The fire fighting pipe 13 may be provided as a flat pipe as shown in fig. 5 and 6, or may be provided in other shapes, such as a cylindrical pipe, etc., in consideration of space efficiency and ease of installation, and the embodiment of the present application is not limited thereto.

In addition, since two or more battery cells 20 may be included in each battery 10 in the embodiment of the present application, in the case where a large number of battery cells 20 are included in the battery 10, a plurality of battery cells 20 may be arranged in an array. For example, the battery 10 in fig. 5 may include 6 × 18 battery cells 20 arranged in an array, only a portion of the battery cells 20 located at the middle of the battery 10 is shown in fig. 6 and 8, and the plurality of battery cells 20 at both sides are not shown, and the battery cells 20 shown in fig. 6 and 8 may be regarded as an array of 2 × 18.

Correspondingly, for the fire fighting pipeline 13 arranged above the battery unit 20, the appearance thereof can be arranged in a corresponding shape. For example, for any column of cells 20 included in the battery 10, the fire fighting pipe 13 may be a straight-line type communication pipe disposed above the cells 20 and controlled by a set of valves. For any two adjacent rows of the single batteries 20, in order to save space and facilitate control, the fire fighting pipeline 13 may be configured as a U-shaped communication pipeline with a bend, and is controlled by a set of valves. Similarly, for three adjacent rows of battery cells 20 included in the battery 10, the fire fighting pipe 13 may also be provided as an S-shaped communication pipe with two bends as shown in fig. 5, 6 and 8 (two S-shaped fire fighting pipes are included in fig. 5 and 6, respectively), and controlled by a set of valves. By analogy, for any adjacent three or more rows of the battery cells 20 included in the battery 10, a curved communication pipeline having more bends may be provided to be controlled by one set of valves, or a plurality of communication pipelines controlled by a plurality of sets of valves respectively may be provided, for example, the plurality of communication pipelines may include at least one of a linear pipeline, a U-shaped pipeline and an S-shaped pipeline, as shown in fig. 5 and 6, and the battery 10 includes two S-shaped fire fighting pipelines and is controlled by two sets of valves respectively, but the embodiment of the present application is not limited thereto.

The set of valves in the embodiment of the present application includes an inlet valve for filling the fire-fighting medium into the fire-fighting pipeline 13 and/or an outlet valve for discharging the fire-fighting medium to the outside, for example, as shown in fig. 5 and 6, the S-shaped fire-fighting pipeline 13 may include two

valves

131 and 132, for example, the valve 131 may be an inlet valve and the valve 132 may be an outlet valve, or the valve 131 may be an outlet valve and the valve 132 may be an inlet valve, and the inlet valve and the outlet valve may be provided at the same time to circulate the fire-fighting medium in the fire-fighting pipeline 13, so that the fire-fighting pipeline 13 may be used for cooling or heating when it is not damaged. In addition, the positions of the valves may be set according to practical applications, for example, for the case that the battery 10 includes multiple sets of valves, the multiple sets of valves may be disposed on the same side of the battery 10 for convenience of installation; alternatively, as shown in fig. 5 and 6, the valves may be disposed on two sides, but for convenience of control, all the inlet valves may be disposed on the same side, and all the outlet valves may be disposed on the other side, but the embodiment of the present invention is not limited thereto.

It should be understood that, as shown in fig. 5 to 8, the blocking member 14 in the embodiment of the present application protrudes relative to the first wall 2011 of the first battery cell, wherein a portion of the blocking member 14 protruding relative to the first wall 2011 may be perpendicular to the first wall 2011 or approximately perpendicular to the first wall 2011, that is, a portion of the blocking member 14 protruding relative to the first wall 2011 may be parallel to the first direction or slightly deviate from the first direction, and the embodiment of the present application is not limited thereto.

Optionally, the arrangement manner of the blocking component 14 in the embodiment of the present application may include: the blocking member 14 may be disposed between the two battery cells 20, for example, a portion of the blocking member 14 is sandwiched between the first battery cell 201 and the second battery cell 202; alternatively, it may include: the blocking member 14 may also be disposed on the first wall 2011 of the first battery cell near the edge of the second battery cell 202, for example, the blocking member 14 may be adhered to the edge of the outer surface of the first wall 2011 of the first battery cell near the edge of the second battery cell 202 to block the fire-fighting medium from flowing from the first battery cell 201 to the second battery cell 202. For convenience of explanation, the blocking member 14 is disposed between the first battery cell 201 and the second battery cell 202, but the embodiment of the present application is not limited thereto.

Optionally, as shown in fig. 8, the battery 10 of the embodiment of the present application may further include a separation member 15, where the separation member 15 may be clamped between two adjacent battery cells 20, for example, the separation member 15 is clamped between a first battery cell 201 and a second battery cell 202, and in addition, the separation member 15 may be located on one side of the blocking member 14 in the first direction and abut against an end of the blocking member 14. The separation member may serve to block heat of adjacent two battery cells. In addition, as for the blocking member 14 disposed between any two adjacent rows of the battery cells 20 in the embodiment of the present application, the blocking member 14 may be a plurality of separate members, or may also be a complete member as shown in fig. 8, and the embodiment of the present application is not limited thereto. The barrier member 14 and the partition member 15 in the embodiment of the present application will be described in detail below with reference to the drawings.

The position where the blocking member 14 is disposed in the embodiment of the present application will be described first in detail.

Fig. 9 shows a schematic diagram of a plurality of battery cells 20 in the embodiment of the present application, where 2 × 9 battery cells 20 in fig. 9 are for illustration, for example, the 2 × 9 battery cells 20 shown in fig. 8 may be a part of the plurality of battery cells 20 included in the battery 10 shown in fig. 5, 6, or 8, and are applicable to the relevant description, and therefore, for brevity, no further description is provided here.

As shown in fig. 9, each battery cell 20 is an approximately rectangular parallelepiped, and the pressure relief mechanism 213 of each battery cell 20 is provided on the lid plate of the battery cell 20. For convenience of description, three directions are first defined herein, and a direction perpendicular to a wall where the pressure relief mechanism 213 is located is a first direction, wherein the first direction includes a Z direction and a reverse direction of the Z direction as shown in fig. 9; the second direction is perpendicular to the Z direction, and as shown in fig. 9, the second direction includes the X direction and the opposite direction of the X direction; the third direction is perpendicular to the Z direction and the X direction, and as shown in fig. 9, includes the Y direction and the opposite direction of the Y direction.

As shown in fig. 9, the plurality of battery cells 20 are divided into two groups arranged along the X direction, which are referred to as a first battery cell group and a second battery cell group, respectively, wherein the first battery cell group includes at least two battery cells arranged along the Y direction, and similarly, the second battery cell group includes at least two battery cells arranged along the Y direction. For convenience of description, as shown in fig. 9, any adjacent four battery cells, namely a first battery cell 201, a second battery cell 202, a third battery cell 203 and a fourth battery cell 204, are mainly used as an example hereinafter.

It should be understood that the first battery cell 201 in the embodiment of the present application described above in fig. 5-8 may refer to the first battery cell 201 in the first battery cell group in fig. 9, and then the second battery cell 202 adjacent to the first battery cell 201 in fig. 5-8 may refer to: a third battery cell 203, also located in the first battery cell stack in fig. 9, and/or a second battery cell 202, also located adjacent to the first battery cell 201 in the second battery cell stack, in fig. 9. That is, the first battery cell 201 and the second battery cell 202 in the embodiment of the present application described in fig. 5 to 8 above may refer to any two adjacent battery cells in the first battery cell set in fig. 9, such as the first battery cell 201 and the third battery cell 203, may refer to any two adjacent battery cells in the second battery cell set in fig. 9, such as the second battery cell 202 and the fourth battery cell 204, may refer to the first battery cell 201 and the second battery cell 202 in the first battery cell set and the second battery cell set, respectively, in fig. 9, may refer to the third battery cell 203 and the fourth battery cell 204 in the first battery cell set and the second battery cell set, respectively, and the embodiment of the present application is not limited thereto.

It is to be understood that each of the battery cells 20 in the embodiment of the present application is provided with two electrode terminals having opposite polarities, and the arrangement directions of the electrode terminals of the plurality of battery cells 20 are generally the same. Specifically, taking the first battery cell 201 and the second battery cell 202 in fig. 9 as an example, two electrode terminals distributed along the X direction are further disposed on the wall where the pressure relief mechanism 213 of the first battery cell 201 is located, and the polarities of the two electrode terminals are opposite, wherein the electrode terminal close to the second battery cell 202 is referred to as a first electrode terminal 2141; similarly, the wall of the second battery cell 202 where the pressure relief mechanism 213 is located is also provided with two electrode terminals distributed along the X direction, and the polarities of the two electrode terminals are opposite, wherein the electrode terminal close to the first battery cell 201 is referred to as a second electrode terminal 2142. It is to be understood that the first and

second electrode terminals

2141 and 2142 may have the same polarity or different polarities.

Alternatively, still taking fig. 9 as an example, the electrode terminals of the plurality of battery cells 20 may be electrically connected by the bus member 12, the bus member for electrically connecting the first electrode terminals 2141 is referred to as a first bus member 121, for example, the first bus member 121 may be used to electrically connect the first electrode terminal 2141 of the first battery cell 201 with one electrode terminal of the third battery cell 203; similarly, a bus member for electrically connecting the second electrode terminal 2142 is referred to as a second bus member 122, and for example, the second bus member 122 may be used to electrically connect the second electrode terminal 2142 of the second battery cell 202 and one electrode terminal of the fourth battery cell 204. Therefore, as can be seen from the connection manner of the bus bar members shown in fig. 9, the first electrode terminals 2141 and the second electrode terminals 2142 have opposite polarities, and a voltage difference exists therebetween, and the magnitude of the voltage difference is related to the number of the battery cells 20. When the voltage difference between the first battery cell 201 and the second battery cell 202 is large, if the first battery cell 201 is in thermal runaway, under the condition that the pressure relief mechanism 213 is actuated and the fire fighting pipeline 13 is damaged, high-temperature particles sprayed out through the pressure relief mechanism 213 or a fire fighting medium flowing out from the fire fighting pipeline 13 may cause a short circuit between the first battery cell 201 and the second battery cell 202, and an ignition phenomenon occurs, and therefore, a blocking member 14 needs to be arranged between the first battery cell 201 and the second battery cell 202 so as to block the fire fighting medium or a discharge of the pressure relief mechanism 213 from flowing from the first battery cell 201 in thermal runaway to the second battery cell 202, thereby improving the safety performance of the battery cells.

In addition, as an example, in the embodiment of the present application, only the blocking member 14 is disposed between the first battery cell 201 and the second battery cell 202, and between the third battery cell 203 and the fourth battery cell 204, that is, as shown in fig. 9, a plurality of battery cells included in the first battery cell group are regarded as one type of battery cells, and the first battery cell 201 is mainly taken as an example for description, and a plurality of battery cells included in the second battery cell group are regarded as another type of battery cells, and the second battery cell 202 adjacent to the first battery cell 201 is mainly taken as an example for description, but the embodiment of the present application is not limited thereto. For example, a blocking member 14 may be disposed between the first battery cell 201 and the third battery cell 203 shown in fig. 9 to block the fire-fighting medium from flowing from the first battery cell 201 to the third battery cell 203, or to block the fire-fighting medium from flowing from the third battery cell 203 to the first battery cell 201; a blocking member 14 may also be disposed between the second battery cell 202 and the fourth battery cell 204 to block the flow of fire-fighting medium from the second battery cell 202 to the fourth battery cell 204, or to block the flow of fire-fighting medium from the fourth battery cell 204 to the second battery cell 202.

In addition, according to the arrangement shown in fig. 9, the wall where the pressure relief mechanism 213 of the first battery cell 201 is located is the first wall 2011 of the first battery cell, so that the wall perpendicular to the first wall 2011 of the first battery cell includes the second wall of the first battery cell 201 with a smaller area and the third wall of the first battery cell 201 with a larger area, and both the second wall of the first battery cell 201 and the third wall of the first battery cell 201 are sidewalls; similarly, the wall where the pressure relief mechanism 213 of the second battery cell 202 is located is the first wall 2021 of the second battery cell, and then the wall perpendicular to the first wall 2021 of the second battery cell includes the second wall of the second battery cell 202 with a smaller area and the third wall of the second battery cell 202 with a larger area, and both the second wall of the second battery cell 202 and the third wall of the second battery cell 202 are sidewalls. In fig. 9, the blocking member 14 is disposed between the second wall of the first battery cell 201 having a smaller area and the second wall of the second battery cell 202 having a smaller area, but in contrast to the arrangement manner in fig. 9, the blocking member 14 may be disposed between the third wall of the first battery cell 201 having a larger area and the third wall of the second battery cell 202 having a larger area, and the embodiment of the present application is not limited thereto.

The form of the blocking member 14 in the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 10 shows a side view of the plurality of battery cells 20 shown in fig. 9, showing the sides parallel to the Z-direction and the plane of the X-direction. As shown in fig. 10, the electrode terminal 214 of the battery cell 20 protrudes from the upper surface of the first wall of the battery cell 20 where the pressure relief mechanism 213 is located in the Z direction, and the bus bar member 12 for electrically connecting different electrode terminals 214 covers the upper surface of the electrode terminal 214. In addition, the barrier member 14 protrudes from the electrode terminal 214 in the Z direction; and, the blocking member protrudes from or is flush with or slightly lower than the bus bar member 12 in the Z direction to reduce the possibility that the electrode terminals of the left and right battery cells are conducted through the fire-fighting medium as shown in fig. 10.

As shown in fig. 10, since a portion of the blocking member 14 protrudes from the upper surface of the first wall of the battery cell along the Z direction, and another portion is sandwiched between the two battery cells 20, for convenience of description, in the embodiment of the present application, the blocking member 14 is divided into a first portion and a second portion, where the first portion is a portion protruding from the upper surface of the first wall of the battery cell along the Z direction, and the second portion is a portion other than the first portion, that is, the second portion is a portion sandwiched between the two battery cells 20.

Fig. 11 shows a schematic view of the blocking member 14 in an embodiment of the present application. For example, fig. 11 shows the blocking member 14 between the first battery cell 201 and the second battery cell 202 in fig. 9, as shown in fig. 11, the blocking member 14 includes a first portion 141 and a second portion 142, the first portion 141 is a portion of the blocking member 14 protruding from a first wall 2011 of the first battery cell in the Z direction, and the second portion 142 is a portion of the blocking member 14 sandwiched between a second wall of the first battery cell 201 and a second wall of the second battery cell 202.

Alternatively, as shown in fig. 11, as for the height h1 of the first portion 141, it is greater than or equal to the height at which the electrode terminal 214 protrudes from the first wall 2011, and h1 is less than or equal to or greater than the height between the upper surface of the bus bar member 12 and the upper surface of the first wall 2011. And as for the height h2 of the second portion 142, which is greater than or equal to the height of the electrode assembly of the battery cell 20, preferably, the second portion 142 may extend beyond the corresponding two ends of the electrode assembly of the battery cell 20 in the Z direction and in the reverse direction of Z, respectively, i.e., the second portion 142 extends beyond the upper end of the electrode assembly of the battery cell 20, which is one end near the electrode terminal, in the Z direction, and the second portion 142 extends beyond the lower end of the electrode assembly of the battery cell 20, which is the end away from the electrode terminal, in the reverse direction of Z, opposite to the upper end. The thermal runaway of the battery cell 20 generally refers to a severe chemical reaction inside the main body of the electrode assembly, which generates a high temperature, and the second portion 142 is provided to isolate heat between two adjacent battery cells.

As for the heights of the first and

second portions

141 and 142 shown in fig. 11, since the second portion 142 needs to be clamped between the adjacent two battery cells 20, for better fixed mounting, the form shown in fig. 12 is generally adopted. Specifically, fig. 12 shows another schematic diagram of a plurality of battery cells 20 in the embodiment of the present application, fig. 13 shows one possibility of a cross-sectional view along the B-B direction of fig. 12, and as can be seen from fig. 12 and fig. 9 in combination with fig. 13, the blocking member 14 in fig. 12 and fig. 13 is a plurality of separate components, for example, the blocking member 14 between the first battery cell 201 and the second battery cell 202 is separated from the blocking member 14 between the third battery cell 203 and the fourth battery cell 204, so that the setting influence of the setting of the blocking member 14 on the positions of the plurality of battery cells 20 can be reduced, and it is ensured that a plurality of battery cells 20 adjacent to each other can be aligned as much as possible, which is more convenient for installation, but the embodiment of the present application is not limited thereto.

For example, the blocking member 14 between a plurality of adjacent battery cells 20 may be provided as one complete plate-shaped structure. Fig. 14 shows a possible cross-sectional view along the direction C-C of fig. 9, in which the blocking member 14 between two adjacent rows of battery cells 20 is arranged in a complete plate-like structure, as shown in fig. 14.

Alternatively, fig. 15 shows another schematic view of the barrier assembly 14 and the isolation member 15 of an embodiment of the present application. As shown in fig. 15, the height h1 of the first portion 141 is the same as in fig. 11, but the height h2 of the second portion 142 is smaller, the second portion 142 serving to sandwich the fixed blocking member 14 between two battery cells. In addition, a separation member 15 may be provided below the blocking member 14, that is, between the two battery cells 20, the separation member 15 being located on one side of the blocking member 14 in the first direction and abutting against an end portion of the blocking member, that is, the second portion 142; alternatively, the spacer member 15 may not contact the second portion 142, and may have a distance in the Z direction, and the embodiment of the present application is not limited thereto. In the present application, the spacer member 15 shown in fig. 15 is exemplified to be in contact with the second portion 142.

The height h3 of the separation member 15 is greater than or equal to the height of the electrode assembly of the battery cell 20, preferably, the separation member 15 may extend beyond the corresponding two ends of the electrode assembly of the battery cell 20 in the Z direction and in the reverse direction of Z, respectively, i.e., the separation member 15 extends beyond the upper end of the electrode assembly of the battery cell 20 in the Z direction, the upper end being one end close to the electrode terminal, and the separation member 15 extends beyond the lower end of the electrode assembly of the battery cell 20 in the reverse direction of Z, the lower end being the end away from the electrode terminal, so that the separation member 15 may be similar to the second portion 142 in fig. 11, thereby functioning to separate heat between two adjacent battery cells.

Alternatively, with respect to the heights of the first portion 141 and the second portion 142 of the barrier member 14 shown in fig. 15, the form shown in fig. 8 is generally selected, that is, the barrier member 14 is disposed between the battery cells 20 as a whole, or a separate structure shown in fig. 12, that is, the barrier members 14 between different adjacent two battery cells 20 are separated from each other, may be adopted. Similarly, for the separation member 15 disposed between two battery cells 20, a plurality of separate structures may be adopted to facilitate the alignment and fixation of a plurality of battery cells 20, or alternatively, a single structure may be adopted, and two adjacent rows of battery cells 20 may be provided with the same separation member 15. The barrier member 14 of the integral structure or the separate structure may be used in combination with the spacer member 15 of the separate structure, and may also be used in combination with the spacer member 15 of the integral structure, and the embodiment of the present application is not limited thereto.

For example, fig. 16 shows another possibility of the cross-section of fig. 9 along the direction C-C, i.e. the blocking member 14 is of a unitary construction, while the spacer member 15 is of a separate construction; also, the entire blocking member 14 may be inserted therein after the battery cells 20 and the spacer member 15 therebetween are fixedly mounted, to improve mounting efficiency. For another example, fig. 17 shows a further possibility of the cross-section of fig. 9 along the direction C-C, i.e. the blocking member 14 is of unitary construction, while the spacer member 15 is of unitary construction.

It should be understood that the height of the electrode assembly described above may refer to the height of the electrode assembly excluding the two tabs, and correspondingly, the both ends of the electrode assembly refer to both end surfaces of the electrode assembly perpendicular to the first direction without including the two tabs, and the distance between the both end surfaces is the height of the electrode assembly described above.

It is to be understood that the blocking member 14 and/or the separation member 15 in the embodiments of the present application may be fixed between two battery cells by a connection member, for example, taking the blocking member 14 between the first battery cell 201 and the second battery cell 202 as an example, the second portion 142 may be attached to the second wall of the first battery cell 201 and/or the second wall of the second battery cell 202 by a connection member. For example, the connecting member may be a structural adhesive or the like.

Since the temperature of the discharged exhaust is high when the pressure release mechanism 213 is actuated, the barrier member 14 is made of a material having a high melting point, and optionally, the melting point of the barrier member 14 may be higher than that of the isolation member 15. For example, a material having a melting point greater than or equal to 300 ℃ may be selected as the barrier member 14, or a material having a melting point greater than or equal to 500 ℃ may be selected as the barrier member 14, and the embodiment of the present application is not limited thereto.

The blocking member 14 should be made of a material that is not easily deformed, so that when the pressure relief structure 213 of the first battery cell is activated, the blocking member 14 can prevent particles from splashing from the first battery cell to the second battery cell, thereby preventing a short circuit. For example, the blocking member 14 may be selected from a material having a greater hardness, and the blocking member 14 may have a greater hardness than the insulating member 15.

For example, the barrier member 14 in the embodiment of the present application may be selected from mica board, ceramic, and foam; and the heat insulating member 15 may be selected from at least one of the following materials: aerogel composite materials, non-polar fiber cotton, thermosetting resin foam, inorganic foam, but the embodiments of the present application are not limited thereto.

An embodiment of the present application also provides a powered device, which may include the battery 10 in the foregoing embodiments. Alternatively, the powered device may be a vehicle 1, a ship or a spacecraft.

The battery and the electric device according to the embodiments of the present application are described above, and the method and the device for manufacturing the battery according to the embodiments of the present application will be described below, wherein portions not described in detail may be referred to the foregoing embodiments.

Fig. 18 shows a schematic flow diagram of a method 300 of preparing a battery according to an embodiment of the present application. As shown in fig. 18, the method 300 may include: providing a plurality of battery cells, wherein the plurality of battery cells comprise a first battery cell and a second battery cell which are adjacent to each other, the first battery cell comprises a pressure relief mechanism, the pressure relief mechanism is arranged on a first wall of the first battery cell, and the pressure relief mechanism is used for being actuated to relieve the internal pressure or temperature of the first battery cell when the internal pressure or temperature reaches a threshold value; 320 providing a fire conduit for containing a fire-fighting medium and for discharging the fire-fighting medium towards the first wall upon actuation of the pressure relief mechanism; and 330, providing a blocking component protruding from the first wall along a first direction, wherein the first direction is a direction perpendicular to the first wall, and the blocking component is used for blocking the fire-fighting medium discharged from the fire-fighting pipeline from flowing from the first battery cell to the second battery cell.

Fig. 19 shows a schematic block diagram of an apparatus 400 for preparing a battery according to an embodiment of the present application. As shown in fig. 19, the apparatus 400 for preparing a battery may include: a module 410 is provided. The providing module is used for: the battery pack comprises a plurality of battery monomers, a first battery monomer and a second battery monomer, wherein the first battery monomer comprises a pressure relief mechanism, the pressure relief mechanism is arranged on a first wall of the first battery monomer, and the pressure relief mechanism is used for actuating to relieve the internal pressure or temperature of the first battery monomer when the internal pressure or temperature reaches a threshold value; a fire conduit for containing a fire-fighting medium and for discharging the fire-fighting medium toward the first wall upon actuation of the pressure relief mechanism; the blocking component protrudes out of the first wall along a first direction, the first direction is a direction perpendicular to the first wall, and the blocking component is used for blocking the fire-fighting medium discharged from the fire fighting pipeline from flowing from the first battery cell to the second battery cell.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit 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 solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced, but the modifications or the replacements do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, comprising:

a plurality of battery cells (20) including a first battery cell (201) and a second battery cell (202) that are adjacent, the first battery cell (201) comprises a pressure relief mechanism (213), the pressure relief mechanism (213) is arranged on a first wall (2011) of the first battery cell, the pressure relief mechanism (213) is configured to actuate to relieve an internal pressure or temperature of the first battery cell (201) when the internal pressure or temperature reaches a threshold value, a first battery cell group and a second battery cell group in the plurality of battery cells (20) are arranged in parallel along a second direction, the first battery cell group comprises at least two first battery cells (201) arranged side by side along a third direction, the second battery cell group comprises at least two second battery cells (202) arranged side by side along a third direction, and the third direction is perpendicular to the second direction;

-a fire fighting conduit (13) for containing a fire fighting medium, and-the fire fighting conduit (13) is for discharging the fire fighting medium towards the first wall (2011) upon actuation of the pressure relief mechanism (213);

a blocking member (14) protruding from the first wall (2011) along a first direction, the first direction is a direction perpendicular to the first wall (2011), and the first direction, the second direction and the third direction are perpendicular to each other, the blocking member (14) is used for blocking the fire-fighting medium discharged from the fire-fighting pipeline (13) from flowing from the first battery cell (201) to the second battery cell (202), wherein a portion of the blocking member (14) is clamped between the second wall of the first battery cell (201) and the second wall of the second battery cell (202), and the second wall of the first battery cell (201) and the second wall of the second battery cell (202) are perpendicular to the first wall (2011);

a plurality of isolation members (15) provided between the first battery cell group and the second battery cell group, wherein a first isolation member of the plurality of isolation members (15) is sandwiched between a second wall of the first battery cell (201) and a second wall of the second battery cell (202), the plurality of isolation members (15) are located on one side of the blocking member (14) in the first direction and abut against an end of the blocking member (14), and the first isolation member is used for blocking heat transfer between the first battery cell (201) and the second battery cell (202);

wherein the barrier member (14) has a melting point higher than the melting points of the plurality of spacer members (15), and the barrier member (14) has a hardness higher than the hardness of the plurality of spacer members (15).

2. The battery according to claim 1, characterized in that a portion of the blocking member (14) is attached to the second wall of the first battery cell (201) and/or the second wall of the second battery cell (202) by a connection.

3. The battery according to claim 1, wherein both ends of the first separation member in the first direction respectively exceed corresponding ends of an electrode assembly of the first battery cell (201), and/or both ends of the first separation member in the first direction respectively exceed corresponding ends of an electrode assembly of the second battery cell (202).

4. The battery according to claim 1, wherein the barrier member (14) has a melting point greater than or equal to 500 ℃.

5. The battery according to any one of claims 1 to 4, wherein an area of a second wall of the first battery cell (201) is smaller than an area of a surface of a third wall of the first battery cell (201), an area of a second wall of the second battery cell (202) is smaller than an area of a surface of a third wall of the second battery cell (202), the second wall of the first battery cell (201) and the second wall of the second battery cell (202) are both perpendicular to the second direction, and the third wall of the first battery cell (201) and the third wall of the second battery cell (202) are both perpendicular to the third direction.

6. The battery according to any one of claims 1 to 4, wherein the first electrode terminal (2141) of the first battery cell (201) is disposed on the first wall (2011) of the first battery cell and protrudes from the first wall (2011) of the first battery cell along the first direction;

the second electrode terminal (2142) of the second battery cell (202) is disposed on the first wall (2021) of the second battery cell and protrudes out of the first wall (2021) of the second battery cell along the first direction, and the first wall (2021) of the second battery cell is a wall where the pressure relief mechanism (231) of the second battery cell (202) is located;

the first electrode terminal (2141) and the second electrode terminal (2142) have opposite polarities and are disposed adjacent to each other in the second direction.

7. The battery according to claim 6, wherein the blocking member (14) protrudes from the first electrode terminal (2141) and/or the second electrode terminal (2142) in the first direction.

8. The battery of claim 6, further comprising:

a first bus member (121) for connecting the first electrode terminal (2141) of the first battery cell (201), the blocking member (14) protruding from or being flush with the first bus member in the first direction; and/or

A second bus member (122) for connecting the second electrode terminal (2142) of the second battery cell (202), the blocking member (14) protruding from or being flush with the second bus member in the first direction.

9. An electrical device, comprising: the battery of any one of claims 1-8.

10. A method of making a battery, comprising:

providing a plurality of battery cells (20), the plurality of battery cells (20) comprise a first battery cell (201) and a second battery cell (202) which are adjacent, the first battery cell (201) comprises a pressure relief mechanism (213), the pressure relief mechanism (213) is arranged on a first wall (2011) of the first battery cell, the pressure relief mechanism (213) is used for actuating to release the internal pressure when the internal pressure or the temperature of the first battery cell (201) reaches a threshold value, a first battery cell group and a second battery cell group in the plurality of battery cells (20) are arranged in parallel along a second direction, at least two first battery cells (201) are arranged in parallel along the third direction in the first battery cell group, at least two second battery cells (202) are arranged in parallel along the third direction in the second battery cell group, the third direction is perpendicular to the second direction;

-providing a fire fighting conduit (13), said fire fighting conduit (13) being adapted to contain a fire fighting medium, and said fire fighting conduit (13) being adapted to discharge said fire fighting medium towards said first wall (2011) upon actuation of said pressure relief mechanism (213);

providing a blocking member (14), wherein the blocking member (14) protrudes from the first wall (2011) along a first direction, the first direction is a direction perpendicular to the first wall (2011), and the first direction, the second direction and the third direction are perpendicular to each other, the blocking member (14) is used for blocking the fire-fighting medium discharged from the fire fighting pipeline (13) from flowing from the first battery cell (201) to the second battery cell (202), wherein a part of the blocking member (14) is clamped between a second wall of the first battery cell (201) and a second wall of the second battery cell (202), and the second wall of the first battery cell (201) and the second wall of the second battery cell (202) are both perpendicular to the first wall (2011);

providing a plurality of isolation members (15), wherein the isolation members (15) are arranged between the first battery cell group and the second battery cell group, a first isolation member of the isolation members (15) is clamped between a second wall of the first battery cell (201) and a second wall of the second battery cell (202), the isolation members (15) are positioned on one side of the blocking member (14) along the first direction and abut against the end part of the blocking member (14), and the first isolation member is used for blocking heat transfer between the first battery cell (201) and the second battery cell (202),

11. An apparatus for manufacturing a battery, comprising: a providing module (410), the providing module (410) being configured to: