CN217468591U

CN217468591U - Isolation assembly, battery module, battery and power utilization device

Info

Publication number: CN217468591U
Application number: CN202221693369.1U
Authority: CN
Inventors: 李志强; 曾超; 包聪; 汪宇超
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2022-09-20
Anticipated expiration: 2032-07-04
Also published as: WO2024007419A1

Abstract

The application provides an isolation component, battery module, battery and electric device, relates to battery technical field. The isolation assembly is used for being arranged between the battery monomers and comprises an isolation piece and an elastic piece, wherein the isolation piece is provided with two opposite abutting surfaces along the thickness direction. The isolation piece is a rectangular isolation plate, and the length direction of the elastic piece is parallel to the edge of the isolation plate. The elastic piece is arranged on at least one abutting surface of the isolation piece in a protruding mode. The isolation assembly can be used to be disposed between battery cells, prevent or inhibit heat transfer between the battery cells, and limit the thermal runaway battery and its effects to a minimum; simultaneously, the butt face at the separator sets up the elastic component, and the tolerance on the battery module length direction can be absorbed to the elastic component for the pretightning force of battery module is in suitable state, can guarantee that the battery module passes through the strength test, can also reduce the free risk of diving of battery.

Description

Isolation assembly, battery module, battery and power utilization device

Technical Field

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

Background

The lithium ion battery energy storage is taken as the main electric energy storage mode at present, and is widely applied to electric power, electric vehicles and other related equipment, and from the accident of lithium ion battery fire and explosion, the single battery in the module is always in failure and thermal runaway occurs, and the heat generated by the thermal runaway of the single battery is transferred to the adjacent battery, so that chain reaction is initiated, and the whole battery system is completely burnt.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides an insulation assembly, a battery module, a battery, and a power consumption device, which can prevent or suppress heat transfer between battery cells.

In a first aspect, the present application provides an isolation assembly for being disposed between battery cells, comprising: the spacer has two abutting surfaces opposed to each other in a thickness direction. The elastic piece is convexly arranged on at least one abutting surface of the isolating piece. The isolation piece is a rectangular isolation plate, and the length direction of the elastic piece is parallel to the edge of the isolation plate.

In the technical scheme of the embodiment of the application, the isolation assembly can be arranged between the battery monomers to prevent or inhibit heat transfer between the battery monomers and limit the thermal runaway battery and the influence thereof in a minimum range; simultaneously, the butt face at the separator sets up the elastic component, and the tolerance on the battery module length direction can be absorbed to the elastic component for the pretightning force of battery module is in suitable state, can guarantee that the battery module passes through the strength test, can also reduce the free risk of diving of battery. The sides of the rectangular isolation plate are generally aligned to the sides of the battery cells, and when the length direction of the elastic piece is parallel to the sides of the isolation plate, the elastic piece is abutted to the battery cells, and then the stress of the battery cells is uniform.

In some embodiments, at least two elastic members are disposed on at least one abutment surface of the spacer. The butt surface of separator is used for butt battery monomer's big face, and when being provided with two at least elastic component on the butt surface of separator, the butt surface has two at least support sites, is favorable to battery monomer to stabilize the butt in the butt surface of isolation subassembly.

In some embodiments, the elastic members are strip-shaped, and at least two of the elastic members form a through passage therebetween for allowing the air flow to pass therethrough. The tip butt of two at least elastic components is behind the free big face of battery, forms the passageway that runs through that the air current passes through between free big face of battery, butt face and two elastic components, is favorable to the free heat dissipation of battery.

In some embodiments, at least two of the resilient members are parallel to each other. The air inlet and the air outlet of the channel formed by the mutually parallel elastic pieces have the same size, which is beneficial to the circulation of air flow.

In some embodiments, the isolation assembly includes two elastic members in a strip shape, and the two elastic members are respectively located at two ends of the isolation plate. Two strip-shaped elastic pieces can be respectively and stably abutted to two ends of the large surface of the battery monomer along the height direction or the length direction, and a through channel allowing airflow to pass is formed between the two elastic pieces, so that the heat dissipation of the battery monomer is facilitated.

In some embodiments, the insulation assembly further comprises a cooling flexible bag containing a cooling medium, the cooling flexible bag being disposed on the at least one abutment surface of the insulation. The cooling medium in the cooling flexible bag can absorb the heat emitted by the battery monomer, so that the cooling effect of the battery monomer is improved.

In some embodiments, the cooling flexible bag is disposed in a middle portion of the abutment surface of the spacer. After the isolation assembly is arranged between the single batteries, the cooling flexible bag can contact or be close to the large surface of the single battery, and the cooling effect of the single battery is improved.

In some embodiments, the spacer has a hollowed-out structure penetrating in a thickness direction. The hollow structure is favorable for air circulation, so that the heat dissipation effect of the battery monomer is improved.

In some embodiments, the height of the elastic member in the thickness direction of the spacer before compression is 1.5 to 2.5mm, and the height of the elastic member in the thickness direction of the spacer after compression is 0.9 to 2.4 mm. The elastic component has better elasticity, can enough absorb the tolerance on the battery module length direction for the pretightning force of battery module is in suitable state, can guarantee that battery module passes through the strength test, can also reduce the free risk of diving of battery. And because the size of the elastic member after compression is small, the elastic member does not occupy too much space, thereby ensuring that the battery has high energy density.

In a second aspect, the present application provides a battery module, which includes a plurality of battery cells and a plurality of isolation assemblies in the above embodiments, wherein the isolation assemblies are disposed between two adjacent battery cells.

In the technical scheme of the embodiment of the application, the isolation assembly is arranged between the battery monomers and used for preventing or inhibiting heat transfer between the battery monomers and limiting the thermal runaway battery and the influence thereof in a minimum range; simultaneously, the butt face at the separator sets up the elastic component, and the tolerance on the battery module length direction can be absorbed to the elastic component for the pretightning force of battery module is in suitable state, can guarantee that the battery module passes through the strength test, can also reduce the free risk of diving of battery.

In some embodiments, the battery cell has curved first transition regions at both ends along the length direction of the battery cell, and the elastic member does not abut against the first transition regions. The intensity in first transition district is lower, and the elastic component can reach 20000N for the free effort of battery to apply the assembly power or the reaction force of inflation power for the elastic component for battery monomer, and the elastic component does not the butt in first transition district to make first transition district take place great deformation after avoiding higher reaction force to extrude first transition district.

In some embodiments, the battery cell has a welding region and a bent second transition region at both ends in the height direction thereof, and the elastic member does not abut against the second transition region and the welding region. The intensity of second transition district and weld area is lower, and the elastic component is the free effort of battery for the free effort of battery exerts the assembly force or the reaction force of inflation power for the elastic component, and the highest 20000N that can reach, the elastic component does not the butt in second transition district and weld area to avoid making first transition district take place great deformation behind higher reaction force extrusion second transition district and the weld area.

In a third aspect, the present application provides a battery including the battery module in the above embodiment.

In a fourth aspect, the present application provides a powered device comprising the battery of the above embodiments, the powered device being configured to provide electrical energy.

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

Drawings

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

FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is a schematic structural diagram of an isolation assembly according to a first embodiment of the present application;

FIG. 5 is a side view of the isolation assembly of the first embodiment of the present application;

FIG. 6 is a side view of a second embodiment of the isolation assembly of the present application;

FIG. 7 is a schematic structural view of a third embodiment of the isolation assembly of the present application;

FIG. 8 is a schematic structural view of an isolation assembly according to a fourth embodiment of the present application;

FIG. 9 is a schematic structural view of an isolation assembly according to a fifth embodiment of the present application;

fig. 10 is a schematic structural view of a battery module according to some embodiments of the present application.

The reference numbers in the detailed description are as follows:

1000-a vehicle;

100-a battery; 200-a controller; 300-a motor;

10-a box body; 11-a first part; 12-a second part;

20-a battery cell; 21-end cap; 22-a housing; 23-an electrode assembly;

30-an isolation component; 400-a spacer; 401-an abutment face; 402-hollow structure; 500-an elastic member; 600-cooling the flexible bag; 40-a battery module; 24-a first transition zone; 25-a second transition zone; 26-a weld zone; 50-a first isolation component; 60-second isolation component.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "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.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

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

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

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The inventor notices that the lithium ion battery system is sensitive to temperature, and thermal runaway is easily caused by overhigh temperature, so that fire, combustion and explosion are caused. Therefore, ensuring the temperature of the lithium ion battery in the whole life cycle is in a reasonable range is an important measure for avoiding fire and explosion. From the lithium ion battery fire and explosion accidents, the single battery in the module is usually failed and thermal runaway occurs, and heat generated by the thermal runaway of the single battery is transferred to the adjacent battery, so that chain reaction is initiated, and the whole battery system is burnt.

In order to prevent or inhibit heat transfer between the battery cells, the applicant has studied and found that an isolation assembly may be provided between the battery cells in the battery module, the isolation assembly being capable of preventing or inhibiting heat transfer between the battery cells, limiting the thermal runaway battery and its effects to a minimum.

In addition, the inventor also finds that when the thicknesses of the single batteries and the isolation assembly are lower than the lower limit, the pre-tightening force of the assembled battery module in the length direction is insufficient, in this case, the module strength is supported only by the end side plate, the module dominant frequency is too low, and the strength test failure risk is large; when the thickness of the single battery and the thickness of the isolation assembly are on the upper limit, the pre-tightening force of the battery module obtained by the equipment in the length direction is too large, the single battery has the risk of water jumping, the capacity of the battery is reduced, and the electrolyte cannot flow in time.

Based on the above consideration, in order to prevent or suppress heat transfer between the battery cells and to make the pretightening force of the battery module in a suitable state, the inventors have conducted extensive studies to design an isolation assembly that can be used to be disposed between the battery cells, prevent or suppress heat transfer between the battery cells, and limit the thermal runaway battery and its influence to a minimum range; simultaneously, set up the elastic component at the butt face of separator, the tolerance on the battery module length direction can be absorbed to the elastic component for the pretightning force of battery module is in suitable state, can guarantee that the battery module passes through the strength test, can also reduce the free risk of diving of battery.

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

The battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the like, which is not limited in this 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.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. 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 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 isolation film may be Polypropylene (PP) or Polyethylene (PE). 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 battery unit further comprises a current collecting member for electrically connecting the tab of the battery unit and the electrode terminal to transmit electric energy from the electrode assembly to the electrode terminal and to the outside of the battery unit through the electrode terminal; 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.

The battery also comprises a sampling terminal and a battery management system, wherein the sampling terminal is connected to the bus component and is used for collecting information of the battery cells, such as voltage or temperature. The sampling terminal transmits the acquired information of the single battery to the battery management system, and when the battery management system detects that the information of the single battery exceeds a normal range, the output power of the battery is limited so as to realize safety protection.

It is to be understood that the electric device using the battery described in the embodiments of the present application may be in various forms, for example, a mobile phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space shuttle, a spacecraft, and the like, an electric toy including a stationary type or a mobile type electric toy, for example, a game machine, an electric car toy, an electric ship toy, an electric plane toy, and the like, an electric tool including a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an electric impact drill, a concrete vibrator, and an electric planer.

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 be applied to all electric devices using the battery cell and the battery.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present disclosure. 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. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and

second portions

11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

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

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded structural schematic diagram of a battery cell according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, a case 22, an electrode assembly 23, and other functional components.

The end cap 21 refers to a member that covers an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength and improved safety. The end cap 21 may be provided with functional components such as electrode terminals. The electrode terminals may be used to electrically connect with the electrode assembly 23 for outputting or inputting electric energy of the battery cell 20. In some embodiments, the end cap 21 may further be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is an assembly for mating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 may be separate components, and an opening may be formed in the housing 22, and the opening may be covered by the end cap 21 to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the housing 22 may be integrated, and specifically, the end cap 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to enclose the inside of the housing 22, the end cap 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in the embodiments of the present invention.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the case 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected with the electrode terminals to form a current loop.

Referring to fig. 4-6, fig. 4 is a schematic structural view of an isolation device according to a first embodiment of the present disclosure, fig. 5 is a side view of an isolation device according to the first embodiment of the present disclosure, and fig. 6 is a side view of an isolation device according to a second embodiment of the present disclosure.

The present application provides an isolation assembly 30 for being disposed between battery cells, comprising: the spacer 400 includes two abutting surfaces 401 opposed to each other in the thickness direction, and an elastic member 500. The elastic member 500 is protruded from at least one contact surface 401 of the spacer 400. The separator 400 is a rectangular separator, and the length direction of the elastic member 500 is parallel to the sides of the separator.

The spacer 400 is a member for being disposed between two battery cells or between a battery cell and an end plate, so that the two battery cells are separated or the battery cell and the end plate are separated, thereby preventing the two battery cells from directly abutting against each other or the battery cell from directly abutting against the end plate.

As an example, the separator 400 may be a plate-shaped structure.

The contact surface 401 is a surface for contacting the large surface of the battery cell.

The elastic member 500 is a member made of a material having a small elastic modulus and protruding from the spacer 400, and the elastic modulus of the elastic member 500 is smaller than that of the spacer 400. After receiving the assembling force of the battery module 40 or the expansion force of the battery cells, the elastic member 500 can be largely deformed in the force receiving direction.

As an example, the elastic member 500 is made of a rubber material.

The separator assembly 30 can be used to be disposed between battery cells, to inhibit or inhibit heat transfer between the battery cells, and to limit thermal runaway cells and their effects to a minimum; simultaneously, set up elastic component 500 at the butt face 401 of separator 400, elastic component 500 can absorb the ascending tolerance of battery module 40 length direction for the pretightning force of battery module 40 is in suitable state, can guarantee that battery module 40 passes through the strength test, can also reduce the free risk of diving of battery. The sides of the rectangular isolation plate are generally aligned with the sides of the battery cells, and when the length direction of the elastic member 500 is parallel to the sides of the isolation plate, it is beneficial to ensure that the stress of the battery cells is uniform after the elastic member 500 abuts against the battery cells.

Referring to fig. 5, optionally, the elastic member 500 is protruded from the two abutting surfaces 401 of the spacer 400.

When both abutting surfaces 401 of the separator 400 are provided with the elastic members 500, the separator assembly 30 can be disposed between two battery cells or between a battery cell and an end plate. When the isolation assembly 30 is disposed between two battery cells, the isolation assembly 30 abuts against two adjacent battery cells by the elastic member 500.

Referring to fig. 6, optionally, the elastic member 500 is protruded from only one abutting surface 401 of the spacer 400.

When only one abutting surface 401 of the separator 400 is provided with the elastic member 500, the separator assembly 30 can be disposed between two battery cells or between a battery cell and an end plate. When the isolation assembly 30 is disposed between two battery cells, the isolation assembly 30 abuts against one of the adjacent battery cells by the elastic member 500, and abuts against the other adjacent battery cell by the abutting surface 401.

According to some embodiments of the present application, please optionally refer to fig. 5 and 7, and fig. 7 is a schematic structural diagram of an isolation assembly according to a third embodiment of the present application. At least one abutment surface 401 of the spacer 400 is provided with at least two elastic members 500.

As an example, referring to fig. 5, at least one abutting surface 401 of the isolation element 400 is provided with two elastic elements 500; referring to fig. 7, three elastic members 500 are disposed on at least one abutting surface 401 of the spacer 400; in other embodiments, four, five or more elastic members 500 are disposed on at least one abutment surface 401 of the spacer 400.

The abutting surface 401 of the spacer 400 is used for abutting against the large surface of the battery cell, and when at least two elastic members 500 are arranged on the abutting surface 401 of the spacer 400, the abutting surface 401 has at least two supporting points, which is beneficial to the stable abutting of the battery cell against the abutting surface 401 of the isolation assembly 30.

When the elastic members 500 are provided on both the abutment surfaces 401 of the spacer 400, the number of the elastic members 500 provided on both the abutment surfaces 401 may be the same or different.

As an example, the elastic members 500 of the two abutting surfaces 401 of the spacer 400 may be one and two, respectively; or one and three respectively; or two and three respectively; or both are two; or all three.

According to some embodiments of the present application, optionally, the elastic members 500 are strip-shaped, and at least two elastic members 500 form a through channel therebetween, which allows the air flow to pass through.

After the end parts of the at least two elastic members 500 abut against the large surface of the single battery, a through channel for passing air flow is formed among the large surface of the single battery, the abutting surface 401 and the two elastic members 500, which is beneficial to heat dissipation of the single battery.

When both the abutment surfaces 401 of the spacer 400 are provided with the elastic member 500, the elastic members 500 provided by the two abutment surfaces 401 may be the same or different.

As an example, the elastic members 500 of the two abutting surfaces 401 of the spacer 400 may be respectively in a strip shape and other shapes, and the other shapes may be a circle, an ellipse, a triangle, a square, a rectangle, a diamond shape, or other regular or irregular shapes; or all strips.

According to some embodiments of the present application, optionally, the at least two elastic members 500 are parallel to each other.

The air inlet and the air outlet of the channel formed by the elastic members 500 parallel to each other have the same size, which is beneficial to the circulation of air flow.

When at least two elastic members 500 are arranged to intersect, a through passage through which an air flow passes cannot be formed between the large surface of the battery cell, the abutting surface 401, and the two elastic members 500, which is not favorable for heat dissipation of the battery cell.

Alternatively, the separator has opposite long and short sides, and the length direction of the elastic member 500 is parallel to the long or short sides of the separator.

Alternatively, the separator has opposite long and short sides, and the length direction of the elastic member 500 is parallel to the long sides of the separator.

According to some embodiments of the present application, optionally, the isolation assembly 30 includes two elastic members 500 in a strip shape, and the two elastic members 500 are respectively located at two ends of the isolation plate.

Two strip-shaped elastic pieces 500 can stably abut against two ends of the large surface of the battery cell in the height direction or the length direction respectively, and a through channel allowing airflow to pass is formed between the two elastic pieces 500, so that the heat dissipation of the battery cell is facilitated.

Optionally, the isolation plate has two ends along the length direction and two ends along the width direction, and when the two elastic members 500 are respectively located at the two ends of the isolation plate along the length direction, the two strip-shaped elastic members 500 are respectively parallel to the two short sides of the isolation plate; when the two elastic members 500 are respectively located at two ends of the isolation board along the width direction, the two strip-shaped elastic members 500 are respectively parallel to two long edges of the isolation board.

According to some embodiments of the present application, optionally, please refer to fig. 8, where fig. 8 is a schematic structural diagram of an isolation device according to a fourth embodiment of the present application. The insulation assembly 30 further comprises a cooling flexible bag 600 containing a cooling medium, the cooling flexible bag 600 being arranged on at least one abutment surface 401 of the insulation 400.

The cooling flexible bag 600 is a sealed bag that can be deformed under the force of a squeezing force.

As an example, the cooling flexible bag 600 is made of a high polymer material, such as polyvinyl chloride, polypropylene, or the like.

The cooling medium is a fluid having a large specific heat capacity, capable of absorbing heat, and is in a liquid state at the battery use temperature.

By way of example, the cooling medium is water, methanol, ethanol, ethylene glycol or glycerol.

The cooling medium in the cooling flexible pouch 600 can absorb heat emitted from the battery cell, thereby improving the cooling effect of the battery cell.

Optionally, the cooling flexible pouch 600 has a multi-layered structure so as to prevent the cooling medium from overflowing after a partial breakage.

According to some embodiments of the present application, optionally, the cooling flexible pouch 600 is provided in the middle of the abutment surface 401 of the separator 400.

After the isolation assembly 30 is disposed between the battery cells, the cooling flexible pouch 600 can contact or be close to the large surface of the battery cells, improving the cooling effect of the battery cells.

Optionally, the isolation assembly 30 includes two elastic members 500 in a strip shape, the two elastic members 500 are respectively located at two ends of the isolation plate, a heat dissipation space is formed between the two elastic members 500, and the cooling flexible bag 600 is disposed in the heat dissipation space.

According to some embodiments of the present application, optionally, please refer to fig. 9, where fig. 9 is a schematic structural diagram of an isolation assembly according to a fifth embodiment of the present application. The separator 400 has a hollow 402 penetrating in the thickness direction.

The hollow structure 402 is beneficial to the circulation of air, thereby improving the heat dissipation effect of the battery cells.

Optionally, the isolation assembly 30 includes two strip-shaped elastic members 500, the two elastic members 500 are respectively located at two ends of the isolation plate, and the hollow-out structure 402 is located between the two elastic members 500.

According to some embodiments of the present application, optionally, the height of the elastic member 500 in the thickness direction of the separator 400 before compression is 1.5 to 2.5mm, and the height of the elastic member 500 in the thickness direction of the separator 400 after compression is 0.9 to 2.4 mm.

As an example, the height of the elastic member 500 in the thickness direction before compression of the separator 400 is 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5 mm.

As an example, the height of the elastic member 500 in the thickness direction of the separator 400 after compression is 0.9mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, or 2.4 mm.

Elastic component 500 has better elasticity, can enough absorb the tolerance on the battery module 40 length direction for the pretightning force of battery module 40 is in suitable state, can guarantee that battery module 40 passes through the strength test, can also reduce the free risk of diving of battery. And since the compressed size of the elastic member 500 is small, it does not occupy much space, thereby ensuring a high energy density of the battery.

Optionally, the acting force acting on the elastic member 500 to make the elastic member 500 compressed from 1.5-2.5 mm to 0.9-2.4 mm includes the assembling force of the battery module 40 and the expansion force of the battery cell, the assembling force of the battery module 40 is 1000-6000N, and the expansion force of the battery cell is 1000-20000N.

Optionally, the height of the elastic member 500 in the thickness direction of the separator 400 before compression is 1.8 to 2.2mm, and the height of the elastic member 500 in the thickness direction of the separator 400 after compression is 0.9 to 2.1 mm.

Referring to fig. 10, according to some embodiments of the present application, fig. 10 is a schematic structural view of a battery module according to some embodiments of the present application.

The present application provides a battery module 40, which includes a plurality of battery cells 20 and a plurality of the above-mentioned embodiments of the isolation assembly 30, wherein the isolation assembly 30 is disposed between two adjacent battery cells 20.

The separator assembly 30 is disposed between the battery cells 20, and serves to prevent or suppress heat transfer between the battery cells 20, limiting the thermal runaway battery and its effects to a minimum; meanwhile, the abutting surface 401 of the spacer 400 is provided with the elastic piece 500, and the elastic piece 500 can absorb tolerance in the length direction of the battery module 40, so that the pretightening force of the battery module 40 is in a proper state, the battery module 40 can be ensured to pass through the strength test, and the risk of water jumping of the battery monomer 20 can be reduced.

It should be noted that the plurality of isolation members 30 in each cell may be the same or different, that is, all of the isolation members 30 may be the elastic member 500 protruding from only one abutting surface 401 of the isolation member 400, or all of the elastic member 500 protruding from two abutting surfaces 401 of the isolation member 400, or a part of the elastic member 500 protruding from only one abutting surface 401 of the isolation member 400, and the rest of the elastic member 500 protruding from two abutting surfaces 401 of the isolation member 400.

Optionally, the isolation assembly 30 includes a first isolation assembly 50 and a second isolation assembly 60, where the first isolation assembly 50 is the isolation assembly 30 in which the elastic member 500 is protruded from only one abutting surface 401 of the isolation member 400, the second isolation assembly 60 is the isolation assembly 30 in which the elastic member 500 is protruded from two abutting surfaces 401 of the isolation member 400, the first isolation assembly 50 is disposed between the battery cells 20 and the end plate, and the abutting surface 401 having the elastic member 500 faces the battery cells 20, and the second isolation assembly 60 is disposed between two adjacent battery cells 20.

According to some embodiments of the present application, optionally, the battery cell 20 has curved first transition regions 24 at both ends along the length direction thereof, and the elastic member 500 does not abut against the first transition regions 24.

The first transition region 24 is a region where the large face and the side face of the battery cell 20 are connected, and the first transition region 24 may have a bending angle or a smoothly curved face.

The strength of the first transition area 24 is lower, the acting force of the elastic member 500 on the battery cell 20 is the reaction force of the assembly force or the expansion force applied to the elastic member 500 by the battery cell 20, the highest reaction force can reach 20000N, and the elastic member 500 is not abutted against the first transition area 24, so that the first transition area 24 is prevented from being deformed greatly after the first transition area 24 is extruded by the higher reaction force.

According to some embodiments of the present application, optionally, both ends of the battery cell 20 in the height direction thereof have the welding region 26 and the bent second transition region 25, and the elastic member 500 does not abut against the second transition region 25 and the welding region 26.

The second transition region 25 is a region where the large surface and the bottom surface of the battery cell 20 are connected, and the second transition region 25 may have a bending angle or a smoothly curved surface.

The weld zone 26 is the area where the housing and end caps of the battery cell 20 are welded.

The strength of the second transition area 25 and the welding area 26 is low, the acting force of the elastic member 500 on the battery cell 20 is the reaction force of the assembly force or the expansion force applied to the elastic member 500 by the battery cell 20, and can reach 20000N at most, and the elastic member 500 does not abut against the second transition area 25, so that the first transition area 24 is prevented from being deformed greatly after the second transition area 25 is extruded by the high reaction force.

Referring to fig. 5 and 9, according to some embodiments of the present application, there is provided an isolation assembly 30, which comprises a spacer 400 and an elastic member 500, wherein the spacer 400 is a rectangular spacer, the spacer 400 has two abutting surfaces 401 opposite to each other in the thickness direction, each abutting surface 401 is provided with two elastic members 500, and all the elastic members 500 are strip-shaped, the two elastic members 500 of each abutting surface 401 are respectively arranged at the two ends of the isolation plate along the width direction, and two strip elastic members 500 are respectively parallel to two long sides of the isolation plate, a through channel allowing air flow to pass through is formed between the two elastic members 500, the isolation member 400 is provided with a hollow structure 402 which penetrates through along the thickness direction, the hollow structure 402 is positioned between the two elastic members 500, the height of the elastic members 500 in the thickness direction before compression of the isolation member 400 is 2mm, and the height of the elastic members 500 in the thickness direction after compression of the isolation member 400 is 0.9-1.9 mm.

According to some embodiments of the present application, referring to fig. 10, the present application provides a battery module 40, which includes a plurality of battery cells 20 and a plurality of isolation members 30 of the above embodiments, wherein each isolation member 30 includes a first isolation member 50 and a second isolation member 60, the first isolation member 50 is the isolation member 30 in which an elastic member 500 is protruded from only one abutting surface 401 of the isolation member 400, the second isolation member 60 is the isolation member 30 in which the elastic member 500 is protruded from two abutting surfaces 401 of the isolation member 400, the first isolation member 50 is disposed between the battery cells 20 and an end plate, the abutting surface 401 having the elastic member 500 faces the battery cell 20, the second isolation member 60 is disposed between two adjacent battery cells 20, the battery cell 20 has a curved first transition region 24 at two ends along the length direction thereof, the battery cell 20 has a welding region 26 and a curved second transition region 25 at two ends along the height direction thereof, the resilient member 500 does not abut the first transition zone 24, the second transition zone 25 and the weld zone 26.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. An isolation assembly for placement between battery cells, the isolation assembly comprising:

a spacer having two abutting surfaces opposing each other in a thickness direction;

the elastic piece is arranged on at least one abutting surface of the isolating piece in a protruding mode;

the isolating piece is a rectangular isolating plate, and the length direction of the elastic piece is parallel to the edge of the isolating plate.

2. An isolation assembly as claimed in claim 1, wherein at least two said resilient members are provided on at least one said abutment surface of said isolation member.

3. An isolation assembly as claimed in claim 2, wherein said resilient members are strip-shaped and form a through passage therebetween for allowing airflow therethrough.

4. An isolation assembly as claimed in claim 3, wherein said at least two said resilient members are parallel to each other.

5. An isolation assembly as claimed in claim 1, wherein the isolation assembly comprises two strip-shaped elastic members, and the two elastic members are respectively located at two ends of the isolation plate.

6. An isolation assembly as claimed in any of claims 1 to 5, further comprising a cooling flexible bag containing a cooling medium, the cooling flexible bag being disposed on at least one of the abutment surfaces of the isolation member.

7. An insulation assembly according to claim 6, wherein said cooling flexible bag is provided in the middle of said abutment surfaces of said insulation.

8. An isolation assembly as claimed in any of claims 1 to 5, wherein the isolation member has a hollowed-out structure penetrating through in the thickness direction.

9. An insulation assembly as claimed in any one of claims 1 to 5, wherein the height of said elastic member in the thickness direction of said insulation member before compression thereof is 1.5 to 2.5mm, and the height of said elastic member in the thickness direction of said insulation member after compression thereof is 0.9 to 2.4 mm.

10. A battery module is characterized by comprising a plurality of battery cells and a plurality of isolation components according to any one of claims 1-9, wherein the isolation components are arranged between two adjacent battery cells.

11. The battery module according to claim 10, wherein the battery cells have curved first transition regions at both ends in the length direction thereof, and the elastic member does not abut against the first transition regions.

12. The battery module according to claim 10, wherein the battery cell has a welding region and a bent second transition region at both ends in the height direction thereof, and the elastic member does not abut against the second transition region and the welding region.

13. A battery comprising the battery module according to any one of claims 10 to 12.

14. An electrical consumer, characterized in that the consumer comprises a battery according to claim 13, the consumer being adapted to provide electrical energy.