CN118056316A

CN118056316A - Isolation assembly, battery module, battery and power utilization device

Info

Publication number: CN118056316A
Application number: CN202280063071.9A
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: 2022-08-10
Publication date: 2024-05-17
Also published as: WO2024007419A1; CN217468591U

Abstract

The application provides an isolation assembly, a battery module, a battery and an electricity utilization device, and relates to the technical field of batteries. The isolation assembly is used for being arranged between the battery cells and comprises an isolation piece and an elastic piece, wherein the isolation piece is provided with two abutting faces opposite to each other along the thickness direction. The elastic piece is convexly arranged on at least one abutting surface of the isolation piece. The isolation assembly can be used to be disposed between the battery cells to prevent or inhibit heat transfer between the battery cells, limiting the thermal runaway battery and its effects to a minimum; meanwhile, the elastic piece is arranged on the abutting surface of the isolation piece, and can absorb tolerance of the length direction of the battery module, so that pretightening force of the battery module is in a proper state, the battery module can be ensured to pass the strength test, and the risk of jumping of the battery unit can be reduced.

Description

Isolation assembly, battery module, battery and power utilization device

Cross Reference to Related Applications

The present application claims priority from chinese patent application 2022216933691 entitled "an insulation assembly, battery module, battery and power device" filed on publication No. 2022, 07, 04, the entire contents of which are incorporated herein by reference.

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 used as a main electric energy storage mode at present, is widely applied to electric power, electric automobiles and other related equipment, and from the perspective of lithium ion battery fire explosion accidents, single battery faults in a module often occur, thermal runaway begins, heat generated by the single battery thermal runaway is transferred to adjacent batteries again, and further chain reaction is initiated, so that the whole battery system is burnt.

Disclosure of Invention

In view of the above, the present application provides an isolation assembly, a battery module, a battery, and an electric device, which are capable of preventing or suppressing heat transfer between battery cells.

In a first aspect, the present application provides an isolation assembly for placement between battery cells, comprising: a spacer having two abutment surfaces opposed in the thickness direction, and an elastic member. The elastic piece is convexly arranged on at least one abutting surface of the isolation piece.

In the technical scheme of the embodiment of the application, the isolation component can be arranged between the battery monomers to prevent or inhibit heat transfer between the battery monomers, so that the thermal runaway battery and the influence thereof are limited within the minimum range; meanwhile, the elastic piece is arranged on the abutting surface of the isolation piece, and can absorb tolerance of the length direction of the battery module, so that pretightening force of the battery module is in a proper state, the battery module can be ensured to pass the strength test, and the risk of jumping of the battery unit can be reduced.

In some embodiments, at least two elastic members are provided on at least one abutment surface of the spacer. The abutting surface of the isolation piece is used for abutting against the large surface of the battery cell, and when at least two elastic pieces are arranged on the abutting surface of the isolation piece, the abutting surface is provided with at least two supporting sites, so that the battery cell is stably abutted against the abutting surface of the isolation component.

In some embodiments, the elastic members are in the shape of a strip, and a through passage allowing air flow to pass is formed between at least two elastic members. After the end parts of the at least two elastic pieces are abutted against the large surface of the battery cell, a penetrating channel through which air flows pass is formed among the large surface of the battery cell, the abutting surface and the two elastic pieces, so that the heat dissipation of the battery cell is facilitated.

In some embodiments, at least two elastic members are parallel to each other. The air inlets and the air outlets of the channels formed by the elastic pieces which are parallel to each other are the same in size, so that the circulation of air flow is facilitated.

In some embodiments, the spacer is a rectangular spacer plate and the length direction of the elastic member is parallel to the sides of the spacer plate. The side of the rectangular isolation plate is generally aligned with the side of the battery cell, and when the length direction of the elastic piece is parallel to the side of the isolation plate, the elastic piece is favorable for being abutted to the battery cell, and the stress of the battery cell is uniform.

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. The two strip-shaped elastic pieces can be respectively and stably abutted to the two ends of the large surface of the battery cell along the height direction or the length direction, and a penetrating channel allowing air flow to pass through is formed between the two elastic pieces, so that the heat dissipation of the battery cell is facilitated.

In some embodiments, the isolation assembly further comprises a cooling flexible bag containing a cooling medium, the cooling flexible bag being disposed on at least one abutment surface of the isolation member. The cooling medium in the cooling flexible bag can absorb heat emitted by the battery cells, thereby improving the cooling effect of the battery cells.

In some embodiments, the cooling flexible bag is disposed in the middle of the abutment face of the spacer. After the isolation assembly is arranged between the battery monomers, the cooling flexible bag can be contacted with or close to the large surface of the battery monomers, so that the cooling effect of the battery monomers is improved.

In some embodiments, the spacer has a hollowed-out structure penetrating in the thickness direction. The hollow structure is favorable for ventilation of air, 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 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 2.4mm. The elastic piece has better elasticity, can 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 the intensity test, can also reduce the free risk of diving of battery. And because the size of the elastic piece after compression is smaller, the elastic piece does not occupy too much space, thereby ensuring that the battery has higher 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 foregoing embodiments, where the isolation assemblies are disposed between two adjacent battery cells.

In the technical scheme of the embodiment of the application, the isolation component is arranged between the battery monomers and used for preventing or inhibiting heat transfer between the battery monomers, so that the thermal runaway battery and the influence thereof are limited within the minimum range; meanwhile, the elastic piece is arranged on the abutting surface of the isolation piece, and can absorb tolerance of the length direction of the battery module, so that pretightening force of the battery module is in a proper state, the battery module can be ensured to pass the strength test, and the risk of jumping of the battery unit can be reduced.

In some embodiments, the battery cell has a curved first transition region at both ends along its length direction, and the elastic member does not abut against the first transition region. The strength of the first transition area is lower, the acting force of the elastic piece on the battery monomer is the reactive force of the assembling force or the expansion force applied to the elastic piece by the battery monomer, the highest acting force can reach 20000N, and the elastic piece is not abutted to the first transition area, so that the first transition area is prevented from being deformed greatly after the first transition area is extruded by the higher reactive force.

In some embodiments, the battery cell has a welding region and a curved 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 strength of the second transition area and the welding area is lower, the acting force of the elastic piece on the battery monomer is the reactive force of the assembling force or the expansion force applied to the elastic piece by the battery monomer, the highest acting force can reach 20000N, and the elastic piece is not abutted to the second transition area and the welding area, so that the first transition area is prevented from being greatly deformed after the second transition area and the welding area are extruded by the higher reactive force.

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

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

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

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

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the application;

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

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

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

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

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

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

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

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

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

Reference numerals in the specific embodiments are as follows:

1000-vehicle;

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

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

20-battery cells; 21-end caps; 22-a housing; 23-an electrode assembly;

30-isolating the component; 400-spacers; 401-abutment surface; 402-a hollowed-out structure; 500-elastic members; 600-cooling the flexible bag; 40-a battery module; 24-a first transition zone; 25-a second transition zone; 26-a welding area; 50-a first isolation assembly; 60-a second isolation assembly.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

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

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

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

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

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

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

Currently, the application of power batteries is more widespread 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, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The inventors have noted that lithium ion battery systems are sensitive to temperature, and that excessive temperatures are prone to thermal runaway, resulting in fires, combustions, explosions. Therefore, ensuring that the temperature of the whole life cycle of the lithium ion battery is within a reasonable range is an important measure for avoiding the occurrence of fire and explosion. From the fire explosion accident of the lithium ion battery, the single battery in the module often fails and thermal runaway begins, and the heat generated by the thermal runaway of the single battery is transferred to the adjacent battery again, 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 found that an isolation assembly may be provided between the battery cells in the battery module, which can prevent or inhibit 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 battery monomer and the isolation component are lower than the lower limit, the pretightening force of the assembled battery module in the length direction is insufficient, and in this case, the strength of the module is supported only by the end side plate, the main frequency of the module is too low, and the risk of failure in strength test is high; when the thickness of the battery monomer and the thickness of the isolation component are deviated from the upper limit, the pretightening force of the battery module obtained by equipment in the length direction is too large, the battery monomer has the risk of diving, the battery capacity is reduced, and the electrolyte can not flow.

Based on the above considerations, in order to prevent or suppress heat transfer between the battery cells and to bring the pretightening force of the battery module into a proper state, the inventors have conducted intensive 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, limit the thermal runaway battery and its influence to a minimum range; meanwhile, the elastic piece is arranged on the abutting surface of the isolation piece, and can absorb tolerance of the length direction of the battery module, so that pretightening force of the battery module is in a proper state, the battery module can be ensured to pass the strength test, and the risk of jumping of the battery unit can be reduced.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. Batteries generally include a battery housing for enclosing one or more battery cells, which can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

The battery cells 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, etc., which the embodiment of the application is not limited to. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types according to the packaging method: cylindrical battery cell, square battery cell and soft package battery cell.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode lug. 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 is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be Polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.

The battery cell further includes a current collecting member for electrically connecting the tab of the battery cell and the electrode terminal to transfer electric energy from the electrode assembly to the electrode terminal, and to the outside of the battery cell through the electrode terminal; the plurality of battery cells are electrically connected through the bus component 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 converging component and used for collecting information of the battery cells, such as voltage or temperature and the like. The sampling terminal transmits the collected information of the battery monomer to the battery management system, and when the battery management system detects that the information of the battery monomer exceeds a normal range, the output power of the battery can be limited to realize safety protection.

It is to be understood that the electric device to which the battery is applied described in the embodiments of the present application may be in various forms, for example, a cellular phone, a portable device, a notebook computer, an electric car, a ship, a spacecraft, an electric toy, and an electric tool, etc., for example, a spacecraft including an airplane, a rocket, a space plane, and a spacecraft, etc., an electric toy including a stationary or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., an electric tool including a metal cutting electric tool, a grinding electric tool, an assembling 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 impact electric 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 the above-described power utilization device, but may be applied to all power utilization devices using the battery cell and the battery, but for simplicity of description, the following embodiments are described by taking an electric automobile as an example.

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

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

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

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

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

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

The end cap 21 refers to a member that is covered at the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cover 21 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 21 is not easy to deform when being extruded and collided, so that the battery cell 20 can have higher structural strength, and the safety performance can be improved. The end cap 21 may be provided with a functional part such as an electrode terminal or the like. The electrode terminals may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric power of the battery cell 20. In some embodiments, the end cap 21 may also 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. The material of the end cap 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

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

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

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

The present application provides an isolation assembly 30 for being disposed between battery cells, comprising: the spacer 400 has two abutment surfaces 401 opposing in the thickness direction, and the elastic member 500. The elastic member 500 is protruding from at least one contact surface 401 of the spacer 400.

The spacer 400 is a component 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 avoiding direct abutment of the two battery cells or direct abutment of the battery cell to the end plate.

As an example, the spacer 400 may be a plate-like structure.

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

The elastic member 500 is a member made of a material having a small elastic modulus 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 assembly force of the battery module 40 or the expansion force of the battery cells, the elastic member 500 can be greatly deformed in the force-receiving direction.

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

The isolation assembly 30 can be used to be disposed between the cells to prevent or inhibit heat transfer between the cells, limiting the thermal runaway cell and its effects to a minimum; meanwhile, the elastic piece 500 is arranged on the abutting surface 401 of the spacer 400, and the elastic piece 500 can absorb tolerance of the battery module 40 in the length direction, so that pretightening force of the battery module 40 is in a proper state, the battery module 40 can be ensured to pass the strength test, and the risk of jumping over of the battery cells can be reduced.

Referring to fig. 5, alternatively, the elastic member 500 is protruded on two abutment surfaces 401 of the spacer 400.

When the elastic member 500 is provided on both abutment surfaces 401 of the separator 400, 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 can be disposed between two battery cells, the isolation assembly 30 abuts against an adjacent one of the battery cells with the elastic member 500, and directly abuts against an adjacent other battery cell with the abutting surface 401.

Referring to fig. 6, alternatively, the elastic member 500 is only protruded on one contact surface 401 of the spacer 400.

When only one abutment surface 401 of the spacer 400 is provided with the elastic member 500, the spacer 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 an adjacent one of the battery cells with the elastic member 500, and directly abuts against an adjacent other battery cell with the abutting surface 401.

Referring to fig. 5 and 7, fig. 7 is a schematic structural diagram of an isolation assembly according to a third embodiment of the present application. At least two elastic members 500 are provided on at least one abutment surface 401 of the spacer 400.

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

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

When both abutment surfaces 401 of the spacer 400 are provided with the elastic members 500, the number of 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 abutment surfaces 401 of the spacer 400 may be one and two, respectively; or one and three respectively; or two and three respectively; or both; or three in each case.

According to some embodiments of the present application, the elastic members 500 may alternatively be in a strip shape, and a through passage allowing the air flow to pass through is formed between at least two elastic members 500.

After the ends of the at least two elastic members 500 are abutted against the large surface of the battery cell, a penetrating channel through which air flows passes is formed among the large surface of the battery cell, the abutting surface 401 and the two elastic members 500, so that heat dissipation of the battery cell is facilitated.

When both 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 abutment surfaces 401 of the spacer 400 may be respectively in a strip shape and other shapes, and the other shapes may be circular, oval, triangular, square, rectangular, diamond or other regular, irregular shapes; or both may be strip-shaped.

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

The air inlets and the air outlets of the channels formed by the elastic members 500 which are parallel to each other are the same in size, which is advantageous for the circulation of air flow.

It should be noted that, when the at least two elastic members 500 are disposed in a crossing manner, a through passage through which the air flow passes cannot be formed between the large surface, the contact surface 401, and the two elastic members 500 of the battery cell, which is not beneficial to heat dissipation of the battery cell.

According to some embodiments of the application, optionally, the spacer 400 is a rectangular spacer plate, and the length direction of the elastic member 500 is parallel to the sides of the spacer plate.

The sides of the rectangular isolation plate are generally aligned with the sides of the battery cells, so that when the length direction of the elastic member 500 is parallel to the sides of the isolation plate, the elastic member 500 is beneficial to being uniformly stressed after being abutted against the battery cells.

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 side of the separator.

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

According to some embodiments of the present application, the isolation assembly 30 may alternatively include two elastic members 500 in a strip shape, and the two elastic members 500 are respectively located at both ends of the isolation board.

The two strip-shaped elastic pieces 500 can be respectively and stably abutted to two ends of the large surface of the battery cell along the height direction or the length direction, and a penetrating channel allowing air flow to pass through is formed between the two elastic pieces 500, so that heat dissipation of the battery cell is facilitated.

Alternatively, the isolation plate has two ends along the length direction and two ends along the width direction, when the two elastic members 500 are respectively positioned 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 both ends of the partition plate in the width direction, the two strip-shaped elastic members 500 are respectively parallel to both long sides of the partition plate.

Optionally, referring to fig. 8, fig. 8 is a schematic structural diagram of an isolation assembly according to a fourth embodiment of the present application. The isolator assembly 30 further includes a cooling flexible bag 600 containing a cooling medium, the cooling flexible bag 600 being disposed on at least one abutment surface 401 of the isolator 400.

The cooling flexible bag 600 is a sealed bag that deforms under the squeezing force.

By way of example, the cooling flexible bag 600 is made of a polymeric material such as polyvinyl chloride, polypropylene, or the like.

The cooling medium is a fluid that has a relatively large specific heat capacity and is capable of absorbing heat and is liquid at the battery operating temperature.

As an example, the cooling medium is water, methanol, ethanol, ethylene glycol or glycerol.

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

Optionally, the cooling flexible pouch 600 has a multi-layered structure so as to avoid spillage of the cooling medium after localized breakage.

According to some embodiments of the application, optionally, a cooling flexible bag 600 is provided in the middle of the abutment face 401 of the spacer 400.

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

Alternatively, the isolation assembly 30 includes two elastic members 500 having a strip shape, the two elastic members 500 are respectively positioned at two ends of the isolation board, 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.

Optionally, referring to fig. 9, fig. 9 is a schematic structural diagram of an isolation assembly according to a fifth embodiment of the present application. The spacer 400 has a hollow structure 402 penetrating in the thickness direction.

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

Alternatively, 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 board, and the hollow structure 402 is located between the two elastic members 500.

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

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

As an example, the height of the elastic member 500 in the thickness direction of the spacer 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, 2.4mm, or 2.5mm.

The elastic piece 500 has good elasticity, and can absorb tolerance in the length direction of the battery module 40, so that pretightening force of the battery module 40 is in a proper state, the battery module 40 can be ensured to pass the strength test, and the risk of jumping over of the battery cells can be reduced. And since the elastic member 500 is compressed in a small size, it does not occupy much space, thereby ensuring a high energy density of the battery.

Alternatively, the acting force acting on the elastic member 500 such that the elastic member 500 is compressed to 0.9 to 2.4mm from the original height of 1.5 to 2.5mm includes the assembly force of the battery module 40 and the expansion force of the battery cell, the assembly force of the battery module 40 is 1000 to 6000N, and the expansion force of the battery cell is 1000 to 20000N.

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

Referring to fig. 10, fig. 10 is a schematic diagram illustrating 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 isolation assemblies 30 in the above embodiments, wherein the isolation assemblies 30 are disposed between two adjacent battery cells 20.

The isolation assembly 30 is disposed between the battery cells 20 for preventing or inhibiting heat transfer between the battery cells 20, limiting the thermal runaway battery and its effects to a minimum; meanwhile, the elastic piece 500 is arranged on the abutting surface 401 of the spacer 400, and the elastic piece 500 can absorb tolerance in the length direction of the battery module 40, so that pretightening force of the battery module 40 is in a proper state, the battery module 40 can be ensured to pass the strength test, and the risk of diving of the battery cell 20 can be reduced.

It should be noted that, the plurality of isolation assemblies 30 in each battery may be the same or different, that is, the isolation assemblies 30 may be all the elastic members 500 protruding from one abutment surface 401 of the isolation member 400, all the elastic members 500 protruding from two abutment surfaces 401 of the isolation member 400, or part of the elastic members 500 protruding from one abutment surface 401 of the isolation member 400, and the rest is the elastic members 500 protruding from two abutment 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 only protruding on one abutment surface 401 of the isolation member 400, the second isolation assembly 60 is the isolation assembly 30 in which the elastic member 500 is protruding on two abutment surfaces 401 of the isolation member 400, the first isolation assembly 50 is disposed between the battery cell 20 and the end plate, the abutment surface 401 with the elastic member 500 faces the battery cell 20, and the second isolation assembly 60 is disposed between two adjacent battery cells 20.

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

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

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

According to some embodiments of the present application, alternatively, the battery cell 20 has a welding region 26 and a curved second transition region 25 at both ends in the height direction thereof, 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 bent angle or a smoothly curved surface.

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

The strength of the second transition area 25 and the welding area 26 is lower, the acting force of the elastic element 500 on the battery cell 20 is the reaction force of the assembling force or the expansion force applied to the elastic element 500 by the battery cell 20, and the maximum acting force can reach 20000N, and the elastic element 500 is not abutted to 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 higher reaction force.

Referring to fig. 5 and 9, the present application provides an isolation assembly 30, which includes an isolation member 400 and an elastic member 500, wherein the isolation member 400 is a rectangular isolation plate, the isolation member 400 has two opposite abutment surfaces 401 along a thickness direction, each abutment surface 401 is provided with two elastic members 500, all elastic members 500 are in a strip shape, the two elastic members 500 of each abutment surface 401 are respectively arranged at two ends of the isolation plate along a width direction, the two strip-shaped elastic members 500 are respectively parallel to two long sides of the isolation plate, a through passage allowing air flow to pass is formed between the two elastic members 500, the isolation member 400 has a hollowed-out structure 402 penetrating along the thickness direction, the hollowed-out structure 402 is located between the two elastic members 500, a height of the elastic member 500 along the thickness direction of the isolation member 400 before compression is 2mm, and a height of the elastic member 500 along the thickness direction of the isolation member 400 after compression is 0.9-1.9 mm.

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 assemblies 30 in the foregoing embodiments, the isolation assemblies 30 include a first isolation assembly 50 and a second isolation assembly 60, wherein the first isolation assembly 50 is the isolation assembly 30 in which the elastic member 500 is only protruded on one contact 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 on two contact surfaces 401 of the isolation member 400, the first isolation assembly 50 is disposed between the battery cells 20 and the end plate, the contact surface 401 with the elastic member 500 faces the battery cells 20, the second isolation assembly 60 is disposed between the adjacent two battery cells 20, the battery cells 20 have curved first transition regions 24 at two ends along the length direction thereof, the battery cells 20 have welding regions 26 and curved second transition regions 25 at two ends along the height direction thereof, and the elastic member 500 is not abutted against the first transition regions 24, the second transition regions 25 and the welding regions 26.

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

Claims

An isolation assembly for placement between battery cells, wherein the isolation assembly comprises:

a spacer having two abutment surfaces opposing in a thickness direction;

The elastic piece is convexly arranged on at least one abutting surface of the isolation piece.
The isolator assembly according to claim 1, wherein at least two of said resilient members are disposed on at least one of said abutment surfaces of said isolator.
The isolator assembly according to claim 2, wherein said elastic members are strip-shaped and a through passage is formed between said at least two elastic members for allowing air flow therethrough.
A spacer assembly as defined in claim 3, wherein said at least two of said resilient members are parallel to each other.
A spacer assembly as claimed in any one of claims 1 to 4 wherein the spacer is a rectangular spacer plate and the length direction of the resilient member is parallel to the sides of the spacer plate.
The isolation assembly of claim 5, wherein the isolation assembly comprises two elastic pieces in a strip shape, and the two elastic pieces are respectively positioned at two ends of the isolation plate.
The isolator assembly according to any one of claims 1 to 6, further comprising a cooling flexible bag containing a cooling medium, said cooling flexible bag being disposed on at least one of said abutment surfaces of said isolator.
The isolator assembly of claim 7, wherein the cooling flexible bag is disposed in a middle of the abutment face of the isolator.
The insulation assembly of any one of claims 1-8, wherein the insulation member has a hollowed-out structure penetrating in a thickness direction.
The separator assembly according to any one of claims 1 to 8, wherein the height of the elastic member in the thickness direction of the separator before compression is 1.5 to 2.5mm, and the height of the elastic member in the thickness direction of the separator after compression is 0.9 to 2.4mm.
A battery module comprising a plurality of battery cells and a plurality of separator assemblies according to any one of claims 1 to 10, the separator assemblies being disposed between adjacent two of the battery cells.
The battery module according to claim 11, wherein the battery cell has curved first transition regions at both ends in a length direction thereof, and the elastic member does not abut against the first transition regions.
The battery module according to claim 11 or 12, wherein both ends of the battery cell in the height direction thereof have a welding region and a curved second transition region, and the elastic member does not abut against the second transition region and the welding region.
A battery, wherein the battery comprises the battery module of any one of claims 11 to 13.
An electrical device, wherein the electrical device comprises the battery of claim 14, the electrical device for providing electrical energy.