CN217719900U - Battery and power consumption device - Google Patents

Abstract

The application relates to a battery and an electric device, and belongs to the technical field of battery manufacturing. The application provides a battery, includes: the battery cell pack comprises a plurality of battery cells, wherein each battery cell comprises an electrode terminal and a pressure relief part; a bus member connected with the electrode terminal to achieve electrical connection of the plurality of battery cells; and the protection piece is made of an insulating material and covers the bus bar component. The battery can reduce the risk of internal short circuit when the battery monomer is out of control due to heat, thereby having better safety performance. The application also provides an electric device comprising the battery.

Description

Battery and power consumption device

Technical Field

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

Background

With the continuous prosperity of the new energy automobile market, the power battery industry is rapidly expanding and growing, the lithium battery technology is increasingly advanced, and higher requirements are put forward on the safety performance of the battery monomer.

When the battery monomer is out of control due to heat, the short circuit is easy to occur in the battery, and certain potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

Therefore, the battery and the electric device are provided, and the risk of internal short circuit can be reduced when the battery monomer is out of control due to heat, so that the battery and the electric device have better safety performance.

An embodiment of a first aspect of the present application provides a battery, including: a battery cell group including a plurality of battery cells, each of the battery cells including an electrode terminal; a bus member connected with the electrode terminal to achieve electrical connection of the plurality of battery cells; and the protection piece is made of an insulating material and covers the bus bar component.

In the battery of this application embodiment, because the protection piece covers the part that converges, can reduce the area that the part that converges exposes in the free exhaust route of battery when the battery monomer takes place thermal runaway, reduce the possibility that the free bleed of battery piles up in the surface of the part that converges, and the protection piece is insulating material, it is insulating each other between protection piece and the part that converges, even the free bleed of battery piles up in the surface of protection piece, can not lead to the bleed yet and converge the part conductive connection, and then can reduce the part that converges and pass through the possibility that the bleed takes place the short circuit with other parts of battery when the battery monomer takes place thermal runaway, make the battery have better security performance.

According to some embodiments of the present application, the electrode terminal is disposed at a first surface of the battery cell group, a side of the protector facing the first surface is recessed to form a recess, and the bus bar member is received in the recess.

In the above scheme, the protector has a recess, and the bus bar member is accommodated in the recess to cover the surface and the peripheral side surface of the bus bar member away from the battery cell group, so as to further reduce the area of the bus bar member exposed to the exhaust path of the battery cell when the battery cell is in thermal runaway, and further significantly reduce the possibility that the bus bar member is short-circuited with other members of the battery through the bleed.

According to some embodiments of the present application, the electrode terminal is disposed at a first surface of the battery cell group, the battery further including: an insulating cover sheet covering the first surface and exposing the electrode terminal; the protection piece is arranged on one side, away from the battery cell group, of the insulating protection plate and connected with the insulating protection plate.

In above-mentioned scheme, the protection piece is connected with insulating backplate to realize with the indirect fixed setting of part that converges, the battery is rocking, the protection piece is difficult for droing under the impact condition, thereby reliably cover the part that converges, reduces the part that converges and takes place the possibility of short circuit through the other parts of letting out thing and battery, improves the free security performance of battery.

According to some embodiments of the present application, a gap is provided between the protector and the bus member in a thickness direction of the bus member.

In the above scheme, because the protection piece and the bus component have a gap, a large assembly tolerance range can be adapted, and thickness variation of the bus component caused by thermal expansion and cold contraction in the charging and discharging processes can be adapted.

According to some embodiments of the application, the protector is connected to the bus member.

In above-mentioned scheme, the protection piece is connected with the part that converges to the realization sets up with the part snap-on that converges, and the battery is rocking, the difficult drop of protection piece under the impact condition, thereby reliably covers the part that converges, reduces the part that converges and takes place the possibility of short circuit through the other parts of letting out thing and battery, improves the free security performance of battery.

According to some embodiments of the present application, the protector is bonded or snapped to the bus bar member.

In the above scheme, the protection piece is connected with the confluence part through bonding or clamping, and the assembly is convenient and reliable.

According to some embodiments of the present application, the number of the bus bar members is plural, the number of the protector is one, and the protector covers the plural bus bar members at the same time.

In the above aspect, one protector covers a plurality of bus members at the same time, which can reduce the number of components inside the battery and simplify the internal structure of the battery.

According to some embodiments of the present application, the number of the bus members and the number of the protectors are each plural, and each of the protectors covers the plural bus members.

In the above-mentioned scheme, the quantity of protection piece is a plurality of, and every protection piece covers a plurality of parts that converge, not only can reduce the external dimension of every protection piece when reducing the battery internal component quantity, can also be according to the nimble appearance that changes the protection piece of the arrangement of a plurality of parts that converge, simplifies the appearance of every protection piece, easily the manufacturing and shaping of protection piece.

According to some embodiments of the present application, the protectors extend in a first direction, and each of the protectors covers a plurality of the bus members arranged in a row in the first direction.

In the above aspect, each of the protectors covers the plurality of bus members arranged in a row in the first direction, and it is possible to allow a gap between adjacent two protectors to expose a part of the surface of the battery cell group, thereby arranging other members.

According to some embodiments of the present application, the number of the confluence members is the same as the number of the protectors, and the confluence members correspond to the protectors one to one.

In the above-described aspect, each protector covers a corresponding one of the bus bars, each bus bar can be independently protected, maintenance and replacement costs of the protector can be reduced, and it is also allowable to expose a surface of the battery cell group between two adjacent bus bars, thereby arranging other components.

According to some embodiments of the present application, the protector is provided with a through hole penetrating the protector along a thickness of the protector.

In the above scheme, the protection piece is provided with the through hole, so that the weight of the protection piece can be reduced, and the battery can meet the requirement of light weight.

According to some embodiments of the present application, the through-hole has a diameter D, satisfying D ≦ 10mm.

In the above scheme, the aperture of the through hole is in the range, the weight of the protection piece can be effectively reduced, and the discharge of the pressure relief part is not easy to penetrate through the through hole to be in contact with the surface of the confluence part, so that the battery has better safety performance.

According to some embodiments of the present application, the melting point of the protective member is greater than or equal to 150 ℃.

In the above aspect, the protector has a melting point within the above range, and does not melt at a temperature at which the drain of the relief portion passes through the bus bar member, so as to reliably cover the surface of the bus bar member, thereby providing the battery with a better safety performance.

According to some embodiments of the present application, each of the battery cells further includes a voltage relief portion, the electrode terminal being disposed at a first surface of the battery cell stack, the voltage relief portion being disposed at a second surface of the battery cell stack.

In the above scheme, the electrode terminals and the pressure relief portions are respectively arranged on different surfaces of the battery cell group, so that the distance between the confluence part connected with the electrode terminals and the pressure relief portions can be increased, the confluence part is arranged away from the pressure relief portions, the temperature and the pressure of a bleed passing through the confluence part when thermal runaway occurs in the battery cells are reduced, the possibility that the bleed of the pressure relief portions damages other metal parts near the confluence part is reduced, and the possibility that the confluence part is short-circuited with other parts of the battery through the bleed is further reduced.

According to some embodiments of the present application, the first surface and the second surface are opposite surfaces of the battery cell stack.

In the above scheme, the bus-bar component and the pressure relief part connected with the electrode terminals are respectively located on two opposite sides of the battery cell group, so that the bus-bar component and the pressure relief part have the largest distance therebetween, the bus-bar component is arranged far away from the pressure relief part to the greatest extent, and the possibility that the bus-bar component is short-circuited with other components of the battery through a release object is remarkably reduced.

According to some embodiments of the present application, the battery further comprises: the battery cell group, the confluence part and the protection part are all arranged inside the box body; wherein the protector is used for insulating and isolating the bus bar part from the inner surface of the box body.

In the above scheme, when the battery cell is out of control thermally, a leakage of the pressure relief portion may accumulate in a gap between the junction member and the box body, so that the junction member is shorted with the inner surface of the box body through the leakage of the pressure relief portion. Because the protector insulates and isolates the confluence part from the inner surface of the box body, the possibility that the confluence part is in short circuit with the inner surface of the box body through a release object of the pressure relief part can be reduced when the single battery is out of control due to heat, and the battery has better safety performance.

According to some embodiments of the application, the case includes a first portion and a second portion, the first portion is used for supporting the battery cell group, the second portion covers the first portion, the pressure relief portion faces the first portion, and the electrode terminal faces the second portion.

In above-mentioned scheme, the first part bearing battery monomer group, and the pressure release portion can make the pressure release portion set up downwards towards the first part, and when battery monomer takes place the thermal runaway, the bleeder's bleeder is the blowout downwards, makes the battery have better security performance.

According to some embodiments of the application, the box body is internally provided with a collecting space, the pressure relief portion is arranged on the second surface of the battery cell group, the collecting space is located between the second surface and the inner surface of the box body, and the collecting space is used for collecting the bleeder discharged by the pressure relief portion.

In above-mentioned scheme, when battery monomer takes place thermal runaway, can collect the bleeder through collecting the space, reduce the volume of the bleeder through the part that converges, reduce the harmful effects of bleeder to the part that converges, reduce the part that converges and pass through the possibility of bleeder and other part short circuits, make the battery have better security performance.

According to some embodiments of the present application, the battery further comprises: and the heat management component is provided with a channel, and the channel is used for communicating the pressure relief part with the collection space.

In the above scheme, the channel of the heat management component is communicated with the pressure relief portion and the collection space, and when the single battery is out of control due to heat, the discharge of the pressure relief portion can smoothly enter the collection space through the channel, so that the collection space effectively collects the discharge, and the safety performance of the battery is improved.

In an embodiment of the second aspect of the present application, an electric device is provided, which includes the battery of the embodiment of the first aspect of the present application, and the battery is used for providing electric energy.

Due to the characteristics of the battery of the embodiment of the first aspect of the present application, the electric device of the embodiment of the second aspect of the present application also has better safety performance.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 illustrates a simplified schematic diagram of a vehicle in an embodiment of the present application;

FIG. 2 is a schematic diagram illustrating a first form of battery in some embodiments of the present application;

FIG. 3 shows an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a simplified view showing a partial structure in which a protector covers a bus bar member in the battery shown in fig. 2;

FIG. 5 shows a cross-sectional view B-B of FIG. 2;

FIG. 6 shows an enlarged view of a portion of FIG. 5 at C;

fig. 7 is a partial schematic view illustrating the connection between the protector and the insulating protector in the battery according to some embodiments of the present application;

fig. 8 is a partial schematic structural view showing a gap between a protector and a bus member in a battery according to some embodiments of the present application;

fig. 9 and 10 are partial structural schematic views illustrating two forms of connection of a protector and a bus bar member in a battery according to some embodiments of the present application, respectively;

FIG. 11 is a schematic diagram of a second form of battery in some embodiments of the present application (first portion not shown);

FIG. 12 is a schematic diagram of a third form of battery in some embodiments of the present application (first portion not shown);

fig. 13 is a schematic view showing a state where the protector is covered on the bus member in the battery shown in fig. 12 (the first portion is not shown);

FIG. 14 is a schematic diagram of a fourth form of cell in some embodiments of the present application (first portion not shown);

fig. 15 is a schematic view showing the structure of a protector in the battery shown in fig. 14;

FIG. 16 is a partial schematic diagram illustrating the structure of the heat management components associated with the battery according to some embodiments of the present application;

the figures are not provided to scale.

Icon: 1000-a vehicle; 100-a battery; 10-a battery cell; 11-a housing; 111-a bottom wall; 112-a cover; 12-an electrode terminal; 13-a pressure relief portion; 14-a first surface; 15-a second surface; 20-a box body; 21-a first part; 211-fifth surface; 22-a second part; 221-a fourth surface; 23-a collection space; 30-a bus member; 31-a first side; 32-a second side; 33-a first gap; 40-a protective element; 41-plate body; 411-a third surface; 42-a side wall; 421-a fastening part; 422-adhesive part; 43-a recess; 44-a through hole; 50-an insulating guard plate; 51-inner side of guard plate; 52-outside of guard plate; 60-a thermal management component; 61-a channel; 200-a controller; 300-a motor; x-a first direction; y-a second direction; z-third direction.

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.

Throughout the description of the present application, it is to be noted that unless otherwise expressly 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 appearances of "a plurality" in this application are intended to mean more than two (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 battery pack comprises a cylindrical battery monomer, a square battery monomer and a soft package battery monomer.

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. The battery generally includes a case for enclosing one or more battery cells, and the case prevents liquid or other foreign materials from affecting the charge or discharge of the battery cells.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. 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 active material layer, and the negative active material layer coats in the surface of negative current collector, and the negative current collector protrusion in the negative current collector who has coated the negative active material layer of uncoated negative active material layer, the negative current collector who does not coat the negative active material layer makes 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 high current can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). 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 plurality of battery cells are electrically connected through the confluence part so as to realize series connection, parallel connection or series-parallel connection of the plurality of battery cells. Specifically, the bus bar part is connected to two opposite electrode terminals of two battery cells which are adjacently arranged so as to realize the series connection of the two battery cells; or the confluence part is connected with the electrode terminals of two adjacent battery monomers with the same polarity so as to realize the parallel connection of the two battery monomers; or the confluence part is connected to the electrode terminal at the output end so as to realize the connection of the battery cell and the external output interface.

The battery cell further comprises a pressure relief portion which is actuated when the internal pressure of the battery cell reaches a threshold value. 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 of the battery cell. The pressure relief portion may take the form of, for example, an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may specifically adopt a pressure-sensitive or temperature-sensitive element or configuration, that is, when the internal pressure or temperature of the battery cell reaches a threshold value, the pressure relief portion performs an action or a weak structure provided in the pressure relief portion is broken, thereby forming an opening or a passage through which the internal pressure or temperature can be relieved.

The term "activate" as used herein means that the pressure relief portion is activated or activated to a certain state, so that the internal pressure and temperature of the battery cell are released. The action of the relief portion may include, but is not limited to: at least a portion of the pressure relief portion ruptures, fractures, is torn or opened, or the like. When the pressure relief portion is actuated, the high-temperature and high-pressure substances in the battery cell are discharged as a leakage from the opened position. In this way, the battery cells can be decompressed and warmed under the condition of controllable pressure or temperature, so that the potential more serious accidents are avoided.

In the related art, when the battery cell is out of thermal runaway, the pressure relief portion is actuated to release high-temperature and high-pressure substances inside the battery cell, and the bus member may be shorted with other conductive members of the battery, thereby causing a safety accident.

The inventor researches and discovers that the bus bar part is in conductive connection with the electrode terminal of the battery cell or the external output interface of the battery under normal conditions, the bus bar part is provided with a safe interval with other conductive parts, or the surface of the other conductive parts is provided with an insulating layer, and the bus bar part and the conductive parts are insulated and isolated through the insulating layer. The high-temperature and high-pressure substances discharged from the pressure relief part may accumulate on the bus bar and contact other metal parts, and may damage the insulating layer on the surface of the conductive parts, which may result in the conductive connection between the bus bar and other conductive parts except the electrode terminal and the external output interface, and further cause a short circuit inside the battery. If can protect the part of converging when battery monomer takes place thermal runaway, reduce the possibility that the part of converging and the bleeder vent direct contact, then can effectively reduce the part of converging because the risk of above-mentioned factor and other conductive parts short circuit, and then improve the security performance of battery.

Based on above-mentioned thinking, this application provides a new scheme, and the battery includes parts and the protection piece that converges, and the protection piece is insulating material, and the protection piece covers the parts that converges, and when battery monomer took place thermal runaway, the protection piece protected the parts that converge, reduced the possibility of converging the parts and the bleeder vent direct contact of pressure relief portion, then can have the risk that reduces the parts that converge because above-mentioned factor and other conductive parts short circuit, and then improved the security performance of battery.

It can be understood that the battery cell described in the embodiments of the present application may directly supply power to an electric device, or may form a battery in parallel or in series, so as to supply power to various electric devices in the form of a battery.

It is to be understood that the electric devices using the battery cells or the batteries described in the embodiments of the present application may be in various forms, for example, mobile phones, portable devices, notebook computers, battery cars, electric cars, ships, spacecraft, electric toys, electric tools, and the like, for example, spacecraft including airplanes, rockets, space shuttles, and spacecraft and the like, electric toys including stationary or mobile electric toys, for example, game machines, electric car toys, electric ship toys, and electric airplane toys, and the like, and electric tools including metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers.

The battery cell and the battery described in the embodiments of the present application are not limited to be applied to the above-described electric devices, but may also be applied to all electric devices using the battery cell and the battery.

Fig. 1 shows a simplified schematic diagram of a vehicle according to an embodiment of the present application.

As shown in fig. 1, a battery 100, a controller 200, and a motor 300 are provided inside a vehicle 1000, and the battery 100 may be provided, for example, at the bottom or the front or rear of the vehicle 1000. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc.

In some embodiments of the present application, battery 100 may be used for power supply of vehicle 1000, for example, battery 100 may be used as an operating power source of vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for operational power requirements during starting, navigation, and traveling of the vehicle 1000.

In other embodiments, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1000.

Among them, the battery 100 referred to in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 includes a battery cell group in which a plurality of battery cells 10 are connected in series or in parallel.

FIG. 2 is a schematic diagram illustrating a first form of battery in some embodiments of the present application;

fig. 3 shows a partial enlarged view at a in fig. 2.

As shown in fig. 2 and 3, the battery 100 includes a battery cell set, a bus member 30, and a case 20, the battery cell set includes a plurality of battery cells 10, the plurality of battery cells 10 are connected in parallel or in series-parallel with each other by the bus member 30 to realize high voltage output, and the plurality of battery cells 10 and the bus member 30 are assembled and then placed inside the case 20.

The case 20 includes a first portion 21 and a second portion 22, the first portion 21 and the second portion 22 are covered with each other to form a battery cavity, and the plurality of battery cells 10 are placed in the battery cavity. Wherein the shape of the first portion 21 and the second portion 22 may be determined according to the shape of a combination of a plurality of battery cells, and the first portion 21 and the second portion 22 may each have one opening. For example, each of the first portion 21 and the second portion 22 may be a hollow rectangular parallelepiped and only one surface of each may be an opening surface, the openings of the first portion 21 and the second portion 22 are oppositely disposed, and the first portion 21 and the second portion 22 are fastened to each other to form the box body 20 having a closed chamber. The plurality of battery cells 10 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in the box 20 formed by buckling the first part 21 and the second part 22.

In some embodiments of the present disclosure, the box 20 is in a hexahedral shape, the first portion 21 has a space for placing the plurality of single batteries 10 therein, the first portion 21 is used for supporting the single battery pack, the second portion 22 is fastened to the first portion 21 to seal the plurality of single batteries 10 inside the box 20, the single batteries 10 are in a hexahedral shape, and the plurality of single batteries 10 are placed inside the box 20.

In other embodiments, the housing 20 may also be cylindrical in shape or other shapes.

As shown in fig. 2, in some embodiments of the present application, the plurality of battery cells 10 are arranged in a square matrix along the first direction X and the second direction Y, and each of the battery cells 10 may have a length direction extending along the second direction Y, a width direction extending along the first direction X, and a height direction extending along the third direction Z.

In other embodiments, a plurality of battery cells 10 may be arranged side by side along the second direction Y or other directions.

Each battery cell 10 includes a case 11, an electrode assembly (not shown), and two electrode terminals 12. The case 11 may have a hexahedral shape or other shapes, and the case 11 has a receiving chamber formed therein for receiving the electrode assembly and the electrolyte. The case 11 includes a case body having an opening at one end thereof such that the electrode assembly can be placed inside the case body through the opening, and a cover 112. The housing may be made of a metallic material, such as aluminum, aluminum alloy, or nickel plated steel. The electrode assembly is disposed inside the case. The cover 112 is provided with two electrode lead-out holes, and the two electrode terminals 12 are provided in the two electrode lead-out holes of the cover 112. One of the two electrode terminals 12 is a positive electrode terminal 12, and the other is a negative electrode terminal 12. The electrode assembly includes two tabs, one of which is a positive tab and the other of which is a negative tab. The positive electrode terminal 12 is connected to a positive tab of the electrode assembly, and the negative electrode terminal 12 is connected to a negative tab of the electrode assembly.

In some embodiments of the present application, the housing is a rectangular parallelepiped, an opening is formed in one side of the housing along the third direction Z, the cover 112 closes the opening in one side of the housing along the third direction Z, and the two electrode terminals 12 are disposed on the cover 112, i.e., located on the same side of the single battery 10 along the third direction Z.

In other embodiments, the housing may have another shape such as a cylinder, and the electrode terminal 12 may be disposed on the housing.

One end of the electrode terminal 12 protrudes into the battery cell 10 to be connected to the tab of the same polarity through the current collecting member, and the other end thereof is exposed to the outside of the cap body 112 to be connected to the bus bar member 30.

Fig. 4 is a simplified schematic view showing a partial structure in which the protector covers the bus bar member in the battery shown in fig. 2.

As shown in fig. 2, 3 and 4, some embodiments of the present application provide a battery 100 including a battery cell stack, a bus member 30 and a protective member 40. The battery cell group includes a plurality of battery cells 10, and every battery cell 10 includes electrode terminal 12, and the part 30 that converges is connected with electrode terminal 12 to realize the electric connection of a plurality of battery cells 10, protection piece 40 are insulating material, and protection piece 40 covers the part 30 that converges.

The battery cell 10 further comprises a pressure relief portion 13, and the pressure relief portion 13 is configured to be actuated to release a substance with high temperature and high pressure inside the battery cell 10 when the battery cell 10 is in thermal runaway.

The electrode terminals 12 of the plurality of battery cells 10 are arranged on the same side, and the pressure relief parts 13 of the plurality of battery cells 10 may be arranged on the same side or different sides; the electrode terminals 12 and the pressure relief portions 13 of the same battery cell 10 may be disposed on the same side or may be disposed on different sides. The bus members 30 and the protective members 40 are uniformly disposed on one side of the battery cell 10 on which the electrode terminals 12 are disposed, the bus members 30 have a plurality, the protective members 40 may have one, and one protective member 40 covers all the bus members 30 at the same time; the protector 40 may also have a plurality, each protector 40 covering at least one bus bar member 30.

The protection member 40 is made of an insulating material, and the protection member 40 may be made of an insulating material from the inside to the outside, or may have only one layer of an insulating material on the surface. For example, the protector 40 is entirely PET (Polyethylene Terephthalate) or a bubble gum as a whole; for another example, the protection member 40 includes a body made of a metal material and an insulating layer covering the body.

The protector 40 covers the bus bar member 30 means that the protector 40 may be plate-shaped, covering only the side of the bus bar member 30 facing away from the cover 112; the protector 40 may have a cover shape, the bus bar member 30 may be housed inside the protector 40, and the protector 40 may cover a side and an outer peripheral side of the bus bar member 30 facing away from the cover 112. The protector 40 may be in contact with the bus member 30, and directly placed on the bus member 30 by gravity; the protector 40 may also have a gap with the bus bar member 30, and be connected with the components inside the battery 100 by the edge of the protector 40 or other support.

In the battery 100 according to the embodiment of the present application, since the protector 40 covers the bus bar member 30, the area of the bus bar member 30 exposed to the vent path of the battery cell 10 can be reduced when the battery cell 10 is thermally runaway, the possibility that the bleed of the pressure relief portion 13 is accumulated on the surface of the bus bar member 30 can be reduced, the protector 40 is made of an insulating material, the protector 40 and the bus bar member 30 are insulated from each other, even if the bleed of the pressure relief portion 13 is accumulated on the surface of the protector 40, the bleed and the bus bar member 30 are not electrically connected, and further, when the battery cell 10 is thermally runaway, the possibility that the bus bar member 30 is shorted with other members of the battery 100 through the bleed can be reduced, so that the battery 100 has good safety performance.

FIG. 5 shows a cross-sectional view B-B of FIG. 2; fig. 6 shows a partial enlarged view at C in fig. 5.

As shown in fig. 2, 5 and 6, in some embodiments of the present application, the electrode terminals 12 are disposed at the first surface 14 of the battery cell stack, a side of the protector 40 facing the first surface 14 is recessed to form a recess 43, and the bus bar member 30 is received in the recess 43.

Along the thickness direction (i.e., the third direction Z) of the bus bar 30, two sides of the bus bar 30 are a first side 31 and a second side 32, respectively, the first side 31 is disposed facing the first surface 14, and the second side 32 is disposed facing away from the first surface 14.

The side of the protector 40 facing the first surface 14 is recessed to form a recess 43; that is, the protector 40 has a plate body 41 and a side wall 42 extending from an edge of the plate body 41 toward the first surface 14, the plate body 41 covers the second side 32 of the bus bar 30, the side wall 42 covers an outer peripheral side (not shown) of the bus bar 30, and the plate body 41 and the side wall 42 together enclose a recess 43.

The protector 40 may have one recess 43, and the one recess 43 accommodates the plurality of bus members 30 at the same time; the protector 40 may also have a plurality of recesses 43, each recess 43 accommodating one bus bar member 30.

It will be appreciated that the projected contour of the sidewall 42 may fall entirely within the first surface 14 or may be located outside the first surface 14. Based on the embodiment that the projection of the sidewall 42 completely falls on the first surface 14, the side of the sidewall 42 away from the plate body 41 may directly or indirectly abut on the first surface 14, or may have a gap with the first surface 14; the protective element 40 can be bonded to the second side 32 of the bus bar 30 via the plate 41, can be bonded or snapped to the bus bar 30 via the side wall 42, and can be fixedly connected to the first surface 14 via the side wall 42, either directly or indirectly.

In some embodiments of the present application, the thickness direction of the plate body 41 and the thickness direction of the bus bar member 30 both extend along the third direction Z, and the side wall 42 has a closed ring shape to completely cover the peripheral side wall 42 of the bus bar member 30. In other embodiments, the sidewall 42 may also be in the form of an open loop, with the sidewall 42 partially covering the peripheral sidewall 42 of the bus member 30.

In the above scheme, the protector 40 has the recess 43, and the bus bar member 30 is accommodated in the recess 43 to cover the surface and the peripheral side surface of the bus bar member 30 facing away from the battery cell group, so as to further reduce the area of the exhaust path exposed to the battery cell 10 by the bus bar member 30 when thermal runaway occurs in the battery cell 10, thereby significantly reducing the possibility that the bus bar member 30 is shorted with other members of the battery 100 through a bleed.

In other embodiments of the present application, the protection member 40 may also include only the plate body 41, and the plate body 41 covers the second side 32 of the bus bar member 30 to simplify the construction of the protection member 40.

Fig. 7 is a partial structural view illustrating the connection of the protector and the insulating protector in the battery according to some embodiments of the present application.

As shown in fig. 2 and 7, in some embodiments of the present disclosure, the electrode terminal 12 is disposed on the first surface 14 of the battery cell pack, and the battery 100 further includes an insulating cover 50 covering the first surface 14 and exposing the electrode terminal 12. Wherein, the protection member 40 is disposed on a side of the insulation guard plate 50 away from the battery cell group, and is connected with the insulation guard plate 50.

Based on the aforementioned embodiment that the first surface 14 is located on one side of the battery cell group along the third direction Z, as shown in fig. 7, the thickness direction of the insulating guard plate 50 extends along the third direction Z, and along the third direction Z, two sides of the insulating guard plate 50 are a guard plate inner side surface 51 and a guard plate outer side surface 52 respectively, the guard plate inner side surface 51 is attached to the first surface 14, the guard plate outer side surface 52 is disposed away from the first surface 14, and the bus member 30 is located between the insulating guard plate 50 and the plate body 41 along the third direction Z.

The side of the side wall 42 of the protection member 40 away from the plate body 41 is an outer end surface, and the outer end surface of the protection member 40 is connected with the guard plate outer side surface 52. It is understood that the outer end face and the outer side face 52 of the guard plate can be bonded by glue or can be clamped by an intermediate member such as a bracket.

In the above scheme, the protection member 40 is connected with the insulating protection plate 50 to realize the indirect fixed setting with the confluence member 30, and the protection member 40 is not easy to fall off under the working conditions of shaking and impact of the battery 100, so that the confluence member 30 is reliably covered, the possibility of short circuit of the confluence member 30 and other members of the battery 100 through a leakage object is reduced, and the safety performance of the battery cell 10 is improved.

Fig. 8 is a partial structural view illustrating a gap between a protector and a bus bar member in a battery according to some embodiments of the present application.

As shown in fig. 8, in some embodiments of the present application, there is a gap between the protector 40 and the bus member 30 in the thickness direction of the bus member 30.

Specifically, both the thickness direction of the bus member 30 and the thickness direction of the plate body 41 of the protector 40 extend in the third direction Z, along which the side of the plate body 41 of the protector 40 facing the bus member 30 includes a third surface 411, and a gap, i.e., the first gap 33, is provided between the third surface 411 and the surface of the second side 32 of the bus member 30. The first gap 33 may be formed by the protective member 40 being snapped into fixed engagement with the edge of the bus bar 30, or may be formed by the protective member 40 being supported by the insulating cover 50.

In the above-described aspect, since the protector 40 and the bus bar member 30 have a gap therebetween, a large assembly tolerance range can be accommodated, and a thickness variation of the bus bar member 30 due to thermal expansion and contraction during charge and discharge can also be accommodated.

Fig. 9 and 10 are partial structural views illustrating two types of connection of a protector and a bus bar member in a battery according to some embodiments of the present application, respectively.

In some embodiments of the present application, the protector 40 is connected to the bus member 30.

As shown in fig. 9 and 10, the protector 40 may be connected to the outer peripheral side of the bus member by the side wall 42; in other embodiments, the plate body 41 of the protection member 40 may be adhered to the second side 32 of the bus bar 30 (as shown in fig. 6).

In above-mentioned scheme, protection piece 40 is connected with the part 30 that converges to the realization sets up with converging the part 30 snap-on, and battery 100 is rocking, the impact operating mode under protection piece 40 is difficult for droing, thereby reliably covers the part 30 that converges, reduces the part 30 that converges and takes place the possibility of short circuit through letting out the thing with other parts of battery 100, improves the security performance of battery monomer 10.

In some embodiments of the present disclosure, the protector 40 is bonded or snapped to the bus bar member 30, as shown in fig. 9 and 10.

As shown in fig. 9, the side wall 42 of the protection member 40 has a latching portion 421, and the latching portion 421 latches the edge of the bus bar member 30 from both sides of the bus bar member 30 to be fixedly connected with the bus bar member 30; alternatively, as shown in fig. 10, the inner side of the side wall 42 of the protector 40 has an adhesion portion 422, and the adhesion portion 422 is adhered to the outer peripheral side of the bus member 30; still alternatively, the plate body 41 of the protector 40 is bonded to the second side 32 of the bus member 30.

In the above scheme, the protection member 40 is connected with the bus bar component 30 in a bonding or clamping manner, and the assembly is convenient and reliable.

As shown in fig. 2, in some embodiments of the present application, the number of the bus members 30 is plural, the number of the protector 40 is one, and the protector 40 covers the plural bus members 30 at the same time.

On the XY plane, the projections of all the bus members 30 fall into the projection of the plate body 41.

In the above-described aspect, one protector 40 covers a plurality of bus members 30 at the same time, and the number of components inside the battery 100 can be reduced, simplifying the internal configuration of the battery 100.

Figure 11 shows a schematic of the structure of a second form of cell in some embodiments of the present application (first part not shown).

As shown in fig. 11, in some embodiments of the present application, the number of the bus members 30 and the number of the protectors 40 are each plural, and each protector 40 covers plural bus members 30.

For each protector 40, the projection of all the bus members 30 covered by the protector 40 on the XY plane falls within the projection of the plate body 41 of the protector 40. As shown in fig. 11, in some embodiments of the present application, the number of the protectors 40 is four, four protectors 40 are arranged in a square matrix, each protector 40 is identical in shape and is square, and each protector 40 covers a portion of the bus member 30. In other embodiments, there may be three protectors 40, wherein two protectors 40 have the same shape and protect a portion of the bus members 30, and the other bus member 30 has a different shape and protects the remaining bus members 30.

In the above-described aspect, the number of the protectors 40 is plural, and each protector 40 covers the plural bus bar members 30, so that not only the number of the internal components of the battery 100 can be reduced while reducing the external size of each protector 40, but also the external shape of the protector 40 can be flexibly changed according to the arrangement of the plural bus bar members 30, the external shape of each protector 40 is simplified, and the manufacturing and molding of the protector 40 are facilitated.

FIG. 12 is a schematic diagram of a third form of battery in some embodiments of the present application (first portion not shown); fig. 13 is a schematic view showing a state where the protector is covered on the bus member in the battery shown in fig. 12 (the first portion is not shown).

As shown in fig. 12 and 13, in some embodiments of the present application, the protectors 40 extend in the first direction X, and each protector 40 covers a plurality of bus members 30 arranged in a row in the first direction X.

The protector 40 has a long shape in which a length direction thereof extends in the first direction X, and the length direction of the bus member 30 also extends in the first direction X, and each protector 40 simultaneously covers a plurality of bus members 30 arranged in a row in the first direction X. The protector 40 has a plurality of protectors 40 arranged side by side in the second direction Y.

The number of the protector members 40 may be one along the first direction X, one protector member 40 covering the entire row of the bus members 30 extending along the first direction X at the same time; the number of the protectors 40 may also be plural along the first direction X, each protector 40 covering a portion of the bus bar member 30 (shown in fig. 11).

As shown in fig. 13, based on the aforementioned embodiment in which the plurality of protection members 40 are arranged side by side along the first direction X or the second direction Y, a gap may be formed between two adjacent protection members 40 to expose a portion of the surface of the battery cell set for the sampling terminal to abut against or place another component; adjacent two of the protecting members 40 may abut against each other to fix the protecting members 40 better.

In the above-described aspect, each of the protection members 40 covers the plurality of bus members 30 arranged in a row in the first direction X, and it is possible to allow a gap between two adjacent protection members 40 to expose a part of the surface of the battery cell group, thereby arranging other members.

In some embodiments of the present disclosure, the number of the bus members 30 is the same as the number of the protection members 40, and the bus members 30 correspond to the protection members 40 one to one.

A gap may be formed between two adjacent protection members 40 to expose a portion of the surface of the battery cell pack for the sampling terminal to abut against or place other components; adjacent two protectors 40 may also abut against each other to better fix the plurality of protectors 40.

In the above-described aspect, each protector 40 covers a corresponding one of the bus bar members 30, each bus bar member 30 can be independently protected, maintenance replacement costs of the protector 40 can be reduced, and it is also allowable to expose a surface of the battery cell group between two adjacent bus bar members 30, thereby disposing other members.

FIG. 14 is a schematic diagram of a fourth form of battery in some embodiments of the present application (first portion not shown); fig. 15 is a schematic view showing the structure of a protector in the battery shown in fig. 14.

As shown in fig. 14 and 15, in some embodiments of the present application, the protector 40 is provided with a through hole 44, and the through hole 44 penetrates the protector 40 along the thickness of the protector 40.

The through holes 44 are provided in plural, and the plural through holes 44 are substantially uniformly provided in the protector 40. As shown in fig. 13 and 14, taking the elongated protector 40 as an example, the length direction of the protector 40 extends along the first direction X, along which the plate body 41 is arranged with a plurality of through holes 44, each through hole 44 penetrating through the plate body 41 in the thickness direction (i.e., the third direction Z) of the plate body 41. In other embodiments, the side wall 42 of the protector 40 may also be provided with through holes 44 to further reduce the weight of the protector 40.

The through holes 44 may be circular, oval, square, diamond-shaped, hexagonal, or the like.

In the above-described aspect, the protector 40 is provided with the through-hole 44, and the weight of the protector 40 can be reduced, thereby making the battery 100 meet the requirement of light weight.

In other embodiments, the protector 40 may be a porous structure or a frame structure as a whole to reduce its weight.

As shown in FIGS. 14 and 15, in some embodiments of the present application, the aperture of the through hole 44 is D, satisfying D ≦ 10mm.

In the above-mentioned solution, the aperture of the through hole 44 is in the above-mentioned range, the weight of the protection member 40 can be effectively reduced, and the bleed of the pressure relief portion 13 is not easily contacted with the surface of the bus bar member 30 through the through hole 44, so that the battery 100 has a better safety performance.

In other embodiments, based on the above-described embodiment in which the protection member 40 has a porous structure or a frame structure as a whole, the porosity of the protection member 40 is less than or equal to 0.8, and the protection member 40 can have sufficient structural strength and can effectively reduce the weight of the protection member 40.

In some embodiments of the present application, the melting point of the protective member 40 is greater than or equal to 150 ℃.

It is understood that the melting point of the protecting member 40 means that the protecting member 40 can be maintained at the melting point temperature without melting for at least 5 to 10 minutes. For example, the melting point of the protective member 40 may be 150 ℃, 250 ℃, 400 ℃, 600 ℃, 900 ℃, 1200 ℃, or the like.

In the above-described aspect, the melting point of the protection member 40 is within the above range, and the discharged material of the pressure relief portion 13 does not melt at the temperature that the discharged material has when passing through the bus bar member 30, so as to reliably cover the surface of the bus bar member 30, resulting in a better safety performance of the battery 100.

As shown in fig. 4, in some embodiments of the present disclosure, each battery cell 10 further includes a voltage relief portion 13, the electrode terminal 12 is disposed on a first surface 14 of the battery cell stack, and the voltage relief portion 13 is disposed on a second surface 15 of the battery cell stack.

For the whole battery cell group, the first surface 14 and the second surface 15 may be two planes oppositely arranged or adjacently arranged, or one of the first surface 14 and the second surface 15 may be a plane, and the other may be an annulus extending around the edge of the plane. As shown in fig. 4, in some embodiments of the present application, the first surface 14 and the second surface 15 are located at two opposite sides of the battery cell pack along the third direction Z, the plurality of electrode terminals 12 are all disposed at the first surface 14, the bus bar member 30 and the protection member 40 are all disposed at the same side as the electrode terminals 12, and the plurality of pressure relief portions 13 are all located at the second surface 15. In other embodiments, the first surface 14 may be located on one side of the battery cell group along the third direction Z, and the second surface 15 may be located on one side of the battery cell group along the first direction X or the second direction Y.

The first surface 14 may be formed by the same wall surface of the plurality of battery cells 10, or may be formed by different wall surfaces of the plurality of battery cells 10; the second surface 15 may be formed by the same wall surface of the plurality of battery cells 10, or may be formed by different wall surfaces of the plurality of battery cells 10. Taking the first surface 14 as an example, in some embodiments of the present application, as shown in fig. 4, the outer surfaces of the covers 112 of the plurality of battery cells 10 collectively form the first surface 14; in other embodiments, the outer surface of the cover 112 of one portion of the battery cell 10 and the outer surface of the housing of another portion of the battery cell 10 together form the first surface 14.

In the above solution, the electrode terminal 12 and the pressure relief portion 13 are respectively disposed on different surfaces of the battery cell group, so that the distance between the bus member 30 connected to the electrode terminal 12 and the pressure relief portion 13 can be increased, the bus member 30 is disposed away from the pressure relief portion 13, the temperature and the pressure when the discharge passes through the bus member 30 when thermal runaway occurs in the battery cell 10 are reduced, the possibility that the discharge of the pressure relief portion 13 damages other metal components near the bus member 30 is reduced, and the possibility that the bus member 30 is shorted with other components of the battery 100 through the discharge is reduced.

In some embodiments of the present application, the first surface 14 and the second surface 15 are opposite surfaces of the battery cell stack.

As shown in fig. 2 and 4, along the third direction Z, the cover 112 of the battery cell 10 and the bottom wall 111 of the housing are disposed opposite to each other, the electrode terminal 12 of each battery cell 10 is disposed on the cover 112, and the pressure relief portion 13 is disposed on the bottom wall 111, that is, the electrode terminal 12 and the pressure relief portion 13 of each battery cell 10 are respectively located on two opposite sides of the battery cell 10 along the third direction Z. The outer surfaces of the covers 112 of the plurality of battery cells 10 collectively form a first surface 14 of the battery cell group, the outer surfaces of the bottom walls 111 of the housings of the plurality of battery cells 10 collectively form a second surface 15 of the battery cell group, the first surface 14 and the second surface 15 are oppositely arranged along the third direction Z, the first surface 14 has a plurality of electrode terminals 12, and the second surface 15 has a plurality of pressure relief portions 13.

In the above-described aspect, the bus member 30 and the pressure relief portion 13 connected to the electrode terminal 12 are respectively located on two opposite sides of the battery cell set, so that the bus member 30 and the pressure relief portion 13 have the largest distance therebetween, and the bus member 30 is arranged furthest away from the pressure relief portion 13, thereby significantly reducing the possibility that the bus member 30 is shorted with other components of the battery 100 through a bleed.

As shown in fig. 2 and 3, in some embodiments of the present application, the battery 100 further includes a case 20, and the battery cell group, the bus bar member 30, and the protector member 40 are disposed inside the case 20. Wherein the protector 40 serves to insulate and isolate the bus bar member 30 from the inner surface of the case 20.

Specifically, the inner wall of the case 20 facing the first surface 14 has a fourth surface 221, and the fourth surface 221 is generally provided with an insulating layer to insulate and isolate the fourth surface 221 from other components inside the battery 100 under normal conditions. The fourth surface 221 and the plate 41 of the protection member 40 may have a safety gap therebetween in the third direction Z, or may be disposed in a fitting manner.

In the above-described configuration, when the thermal runaway of the battery cell 10 occurs, a drain of the pressure relief portion 13 may accumulate in the gap between the bus bar 30 and the case 20, so that the bus bar 30 is shorted with the inner surface of the case 20 by the drain of the pressure relief portion 13. Since the protector 40 insulates and isolates the bus member 30 from the fourth surface 221, when thermal runaway of the battery cell 10 occurs, the possibility that the bus member 30 is shorted with the fourth surface 221 through a bleed of the pressure relief portion 13 can be reduced, and the battery 100 has better safety performance.

As shown in fig. 2 and 3, in some embodiments of the present disclosure, the case 20 includes a first portion 21 and a second portion 22, the first portion 21 is used for holding the battery cell pack, the second portion 22 is covered on the first portion 21, the pressure relief portion 13 faces the first portion 21, and the electrode terminal 12 faces the second portion 22.

The first part 21 holds the battery cell pack, that is, the first part 21 is located on the lower side of the second part 22, and the battery cell pack is placed on the first part 21 by gravity.

Based on the aforementioned embodiment in which the electrode terminal 12 is disposed on the first surface 14 and the pressure relief portion 13 is disposed on the second surface 15, the second surface 15 of the battery cell group faces the first portion 21, the first surface 14 faces the second portion 22, that is, the pressure relief portion 13 is disposed downward, the bus member 30 connected to the electrode terminal 12 is disposed upward, and the fourth surface 221 is an inner wall of the second portion 22.

In the above-described embodiment, the first section 21 supports the battery cell group, and the pressure relief portion 13 faces the first section 21, so that the pressure relief portion 13 can be disposed downward, and when thermal runaway occurs in the battery cell 10, a drain of the pressure relief portion 13 is ejected downward, so that the battery 100 has good safety performance.

As shown in fig. 2 and 3, in some embodiments of the present application, the case 20 has a collection space 23 inside, the pressure relief portion 13 is disposed on the second surface 15 of the battery cell pack, the collection space 23 is located between the second surface 15 and the inner surface of the case 20, and the collection space 23 is used for collecting the discharge of the pressure relief portion 13.

Along the third direction Z, the inner wall of the first part 21 facing the second surface 15 has a fifth surface 211, and the space between the fifth surface 211 and the second surface 15 is a collecting space 23. A supporting part can be arranged or formed between the battery monomer group and the first part 21, a supporting frame is used for supporting the battery monomer group to form a collecting space 23, and the collecting space 23 is communicated with the pressure relief part 13 so as to reliably collect the discharged materials.

In the above scheme, when thermal runaway occurs in the battery cell 10, the collection space 23 may be used to collect the bleed, so as to reduce the amount of the bleed passing through the junction block 30, reduce the adverse effect of the bleed on the junction block 30, reduce the possibility that the junction block 30 is shorted with other components through the bleed, and enable the battery 100 to have better safety performance.

Fig. 16 is a schematic diagram illustrating a partial structure of a heat management component in a battery according to some embodiments of the present application.

As shown in fig. 2 and 16, in some embodiments of the present application, the battery 100 further includes a thermal management member 60, the thermal management member 60 having a passage 61, the passage 61 for communicating the pressure relief portion 13 and the collection space 23.

The thermal management component 60 is used to regulate the ambient temperature of the battery cell stack. The thermal management member 60 has a plate-shaped structure in which the thickness direction thereof extends in the third direction Z, and the thermal management member 60 is disposed between the collection space 23 and the battery cell group along the third direction Z, and the thermal management member 60 has passages 61 corresponding to the number and positions of the pressure relief portions 13. The channel 61 may also provide space required for the relief portion 13 to protrude from the second surface 15 upon actuation to ensure effective actuation of the relief portion 13.

The passage 61 may be a structure having openings at both ends, which maintains communication between the relief portion 13 and the collection space 23 at all times; the channel 61 may also have an opening at one end facing the pressure relief portion 13, and a breaking threshold at the other end closed by a protective film, so that when the battery cell 10 is thermally out of control, the protective film is broken by the pressure actuated by the pressure relief portion 13, so that the discharged matter enters the collecting space 23.

In the above scheme, the channel 61 of the thermal management component 60 communicates the pressure relief portion 13 and the collection space 23, and when the battery cell 10 is out of thermal control, the discharge of the pressure relief portion 13 can smoothly enter the collection space 23 through the channel 61, so that the collection space 23 effectively collects the discharge, and the safety performance of the battery 100 is improved.

Some embodiments of the present application provide an electric device, which includes a battery 100, and the battery 100 is used for providing electric energy.

Due to the characteristics of the battery 100 of the embodiment of the present application, the electric device of the embodiment of the present application also has better safety performance.

As shown in fig. 1 to 16, some embodiments of the present application provide a battery 100 including a case 20, a battery cell group, a bus bar member 30, a protection member 40, and an insulation sheathing 50, the case 20 including a first portion 21 of a lower side and a second portion 22 of an upper side, the battery cell group, the bus bar member 30, the protection member 40, and the insulation sheathing 50 all being located inside the case 20. The battery cell group comprises a plurality of battery cells 10, the bus bar component 30 is connected with the electrode terminals 12 of the battery cells 10, the protection component 40 covers the bus bar component 30 from the outside, high-temperature particles discharged from the bus bar component 30 and the pressure relief part 13 are separated from air flow, and the possibility that the bus bar component 30 is short-circuited with other components of the battery 100 through discharged matters is reduced.

The battery cell group is placed in the first portion 21, the pressure relief portion 13 of the battery cell 10 is arranged downward and is communicated with the collection space 23 at the bottom of the first portion 21, the electrode terminal 12 of the battery cell 10 is arranged upward, the bus bar member 30 is positioned at the upper side of the battery cell group, and the protection member 40 can be placed on the bus bar member 30 or the battery cell group, or can be fixed to the bus bar member 30 or the battery cell group. Since the relief portion 13 is distant from the bus bar member 30, it is possible to allow the high temperature resistance of the protector 40 to be low, for example, the melting point of the protector 40 is 150 °.

The protector 40 may have a plate shape, protecting the bus member 30 from one side; or a cover shape having a recess 43, which covers the outside of the bus bar member 30, the recess 43 being a cavity having at least three inner surfaces. The protector 40 may have one recess 43, and the one recess 43 accommodates the plurality of bus members 30 at the same time; the protector 40 may have recesses 43, each recess 43 accommodating one bus bar member 30; the number of the protector members 40 may be one, one protector member 40 covers a plurality of the bus members 30 at the same time, and the number of the protector members 40 may be plural, each protector member 40 covers one of the bus members 30.

The protection member 40 is made of an insulating material such as PET (Polyethylene Terephthalate) or bubble gum, and the protection member 40 may have a dense structure or a structure with a small hole shape, thereby performing heat dissipation and weight reduction.

Because the protection member 40 is adopted to cover the confluence member 30 in the battery 100 of the embodiment of the application, the confluence member 30 is separated from the high-temperature air flow and the high-temperature particles discharged by the pressure relief part 13 at least partially, the ignition risk of thermal runaway of the battery cell 10 is reduced, and the safety performance of the battery 100 is improved. Furthermore, the protection member 40 may also absorb a portion of the impact energy when the battery 100 is subjected to external compression or impact, thereby playing a role in buffering, reducing the possibility that components inside the battery 100 are damaged under the conditions of impact and shaking, and improving the safety performance of the battery 100.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (20)

1. A battery, comprising:

a battery cell group including a plurality of battery cells, each of the battery cells including an electrode terminal;

a bus member connected with the electrode terminal to achieve electrical connection of the plurality of battery cells;

and the protection piece is made of an insulating material and covers the bus bar component.

2. The battery according to claim 1, wherein the electrode terminal is disposed at a first surface of the battery cell group, a side of the protector facing the first surface is recessed to form a recess, and the bus bar member is received in the recess.

3. The battery of claim 1, wherein the electrode terminal is disposed at a first surface of the battery cell stack, the battery further comprising:

an insulating cover sheet covering the first surface and exposing the electrode terminal;

the protection piece is arranged on one side, facing away from the battery cell group, of the insulating protection plate and is connected with the insulating protection plate.

4. The battery according to claim 1, wherein a gap is provided between the protector and the bus member in a thickness direction of the bus member.

5. The battery according to claim 1, wherein the protector is connected to a bus member.

6. The battery of claim 5, wherein the protector is bonded or snapped to the bus bar member.

7. The battery according to claim 1, wherein the number of the bus bar members is plural, the number of the protector is one, and the protector covers the plural bus bar members at the same time.

8. The battery according to claim 1, wherein the number of the bus members and the number of the protectors are each plural, each of the protectors covering the plural bus members.

9. The battery according to claim 8, wherein the protective members extend in a first direction, each of the protective members covering a plurality of the bus members arranged in a row in the first direction.

10. The battery of claim 1, wherein the number of the bus members and the number of the protective members are the same, and the bus members and the protective members correspond one-to-one.

11. The battery according to claim 1, wherein the protective member is provided with a through hole penetrating the protective member along a thickness of the protective member.

12. The battery of claim 11, wherein the through-hole has a diameter D that satisfies D ≦ 10mm.

13. The battery according to claim 1, wherein the protective member has a melting point of 150 ℃ or higher.

14. The battery of any of claims 1-13, wherein each of the battery cells further comprises a voltage relief portion, the electrode terminal being disposed on a first surface of the battery cell stack, the voltage relief portion being disposed on a second surface of the battery cell stack.

15. The battery of claim 14, wherein the first surface and the second surface are opposing surfaces of the battery cell stack.

16. The battery of claim 14, further comprising:

the battery cell group, the confluence component and the protection piece are all arranged inside the box body;

wherein the protector is used for insulating and isolating the bus bar part from the inner surface of the box body.

17. The battery of claim 16, wherein the case includes a first portion for holding the battery cell stack and a second portion covering the first portion, the pressure relief portion faces the first portion, and the electrode terminal faces the second portion.

18. The battery of claim 16, wherein the box has a collection space therein, the pressure relief portion is disposed on the second surface of the battery cell pack, the collection space is located between the second surface and an inner surface of the box, and the collection space is used for collecting a drain discharged by the pressure relief portion.

19. The battery of claim 18, further comprising:

and the heat management component is provided with a channel which is used for communicating the pressure relief part with the collection space.

20. An electrical device comprising a battery as claimed in any one of claims 1 to 19 for providing electrical energy.

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