CN218448351U - Separator assembly, battery cell, battery and power consumption device - Google Patents

Abstract

The embodiment of the application provides a baffle subassembly, battery monomer, battery and power consumption device, wherein the baffle subassembly includes first apron, second apron and first insulating part, and first apron is used for sealing first casing, and the second apron is used for sealing the second casing, and first insulating part sets up between first apron and second apron. The separator assembly embodiment that this application provided can be connected together two electrode subassemblies electricity to increase the free capacity of single battery, satisfy the demand of various consumer to battery capacity. Meanwhile, the first insulating part can prevent the two shells from being at the same potential and prevent the two shells from being corroded.

Description

Separator assembly, battery cell, battery and power consumption device

Technical Field

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

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

At present, the capacity of the battery cell is an important factor influencing the use and development of the battery.

SUMMERY OF THE UTILITY MODEL

The application provides a baffle subassembly, battery monomer, battery and power consumption device can effectively improve the free capacity size of battery.

In a first aspect, the present application provides a baffle plate assembly comprising:

a first cover plate for closing the first housing;

a second cover plate for closing the second housing; and

and the first insulating piece is arranged between the first cover plate and the second cover plate.

By adopting the separator assembly provided by the embodiment, two electrode assemblies can be electrically connected, so that the capacity of a single battery cell is increased, and the requirements of various electric devices on the battery capacity are met. Meanwhile, the first insulating part can prevent the two shells from being at the same potential, and prevent the two shells from being corroded.

In some embodiments, a third gap is formed between the first cover plate and the second cover plate, the first cover plate and the first shell have a first connection point, the second cover plate and the second shell have a second connection point, and the first connection point and the second connection point are respectively located on two opposite sides of the third gap.

The embodiment can separate the first joint from the second joint by arranging the third gap between the first cover plate and the second cover plate, and simultaneously, the first insulating piece is far away from the third gap, so that the first insulating piece is prevented from melting due to high temperature generated when the first joint and the second joint are welded, and the melt of the first insulating piece is further prevented from influencing the welding quality of the cover plate and the shell.

In some embodiments, the first insulating member includes a first insulating portion and a second insulating portion, the second insulating portion is disposed at an edge of the first insulating portion, a projection of the second insulating portion on the first cover plate along the first direction covers a first connection of the first cover plate and the first housing, and a side of the second insulating portion close to the first cover plate has a first gap with the first cover plate; and/or the projection of the second insulating part on the second cover plate along the first direction covers a second connecting part of the second cover plate and the second shell, and a second gap is formed between the side surface, close to the second cover plate, of the second insulating part and the second cover plate, wherein the first direction is the thickness direction of the first insulating part.

The first gap is formed between the side face, close to the first cover plate, of the second insulating part and the first cover plate, the first connecting position of the first cover plate and the first shell can be spaced from the second insulating part of the first insulating part, and the second insulating part of the first insulating part is prevented from being too close to the first connecting position of the first cover plate and the first shell and being heated and melted, so that the welding quality between the first cover plate and the first shell is influenced.

The second gap is formed between the side face, close to the second cover plate, of the second insulating part and the second cover plate, the second connecting position of the second cover plate and the second shell can be spaced from the second insulating part of the first insulating part, and the situation that the second insulating part of the first insulating part is too close to the second connecting position of the second cover plate and the second shell and is heated and melted is avoided, and therefore welding quality between the second cover plate and the second shell is affected.

Moreover, the projection of the second insulating part on the first cover plate along the first direction covers the first connection position of the first cover plate and the first shell, so that the second insulating part at least can block the debris generated when the first cover plate and the first shell are welded at the first connection position; the projection of the second insulating part on the second cover plate along the first direction covers a second connection position of the second cover plate and the second shell, so that the second insulating part can also block debris generated when the second cover plate and the second shell are welded at the second connection position. Therefore, through setting up the second insulating part, can realize the isolation of first junction and second junction, avoid first apron and first casing to make the metal wire overlap joint on two apron and take place the short circuit at the piece granule that produces or the piece granule that second apron and second casing produced when the second junction welds when the welding of first junction makes two apron, and then promote the free security performance of battery.

In some embodiments, two side surfaces of the first insulating portion, which are oppositely arranged along the first direction, are respectively in contact with the first cover plate and the second cover plate, and the thickness of the second insulating portion is smaller than that of the first insulating portion; wherein a side of the second insulating portion facing the first cover plate is farther away from the first cover plate than a side of the first insulating portion facing the first cover plate to form a first gap between the second insulating portion and the first cover plate; and/or a side of the second insulation part facing the second cover plate is farther away from the second cover plate than a side of the first insulation part facing the second cover plate to form a second gap between the second insulation part and the second cover plate.

In this embodiment, by setting the thickness of the second insulating portion to be smaller than the thickness of the first insulating portion, a first gap is formed between the side of the second insulating portion facing the first lid and the first lid, and a second gap is formed between the side of the second insulating portion facing the second lid and the second lid. The second insulating portion has a thickness smaller than that of the first insulating portion, thereby forming a stepped structure on the first insulating member. The structure of the first cover plate and the structure of the second cover plate can be kept unchanged by reducing the thickness of the second insulating part to form the first gap and/or the second gap, and the step and the cost for structurally modifying the first cover plate and the second cover plate are saved.

In some embodiments, in the first direction, the thickness of the second insulating portion is equal to or greater than the thickness of the first insulating portion, and a side surface of the first cover plate facing the second insulating portion is provided with a first groove to form a first gap; and/or the side surface of the second cover plate facing the second insulating part is provided with a second groove to form a second gap.

In this embodiment, the first groove is formed in the first cover plate to form the first gap, and the second groove is formed in the second cover plate to form the second gap, so that the structure of the first insulating member can be kept unchanged, and the step and cost for modifying the structure of the first insulating member can be saved.

In some embodiments, the second insulation portion is arranged annularly along an edge of the first insulation portion.

Through being the annular with second insulating part along the edge of first insulating part and arranging, can realize the comprehensive isolation to first junction and second junction in the circumferential direction of first insulating part, avoid appearing keeping apart the leak and cause the isolation inefficacy.

The overall shape of the second insulating part is matched with the shape of the first insulating part and the shapes of the first cover plate and the second cover plate, for example, when the first cover plate and the second cover plate are square, the second insulating part is of a square annular structure; when the first cover plate and the second cover plate are circular, the second insulating part is a circular ring structure or the like.

In some embodiments, an end of the second insulating portion away from the first insulating portion protrudes beyond an edge of the first cover plate; and/or the end part of the second insulating part far away from the first insulating part protrudes out of the edge of the second cover plate.

In this embodiment, an end of the second insulating portion far from the first insulating portion protrudes beyond an edge of the first cover plate, that is, a length of the second insulating portion is greater than a distance between the edge of the first cover plate and the first insulating portion; the end part of the second insulating part far away from the first insulating part protrudes out of the edge of the second cover plate, namely the length of the second insulating part is greater than the distance between the edge of the second cover plate and the first insulating part. The length that sets up like this can make first insulating part is greater than the length of first apron and second apron to prevent more effectively that first clearance and second clearance from communicating with each other, prevent that the piece granule that produces from getting into the second clearance in first apron and the first casing welding process, perhaps the piece granule that produces from getting into first clearance in second apron and the second casing welding process, and then prevent that the metal wire overlap joint on first apron and the second apron from taking place the short circuit.

In some embodiments, a dimension s of the end of the second insulating portion away from the first insulating portion protruding beyond the edge of the first cover plate is less than or equal to 2mm; and/or the size s of the end part of the second insulating part far away from the first insulating part protruding out of the edge of the second cover plate is less than or equal to 2mm.

In this embodiment, the length s of the end of the second insulating portion far from the first insulating portion protruding out of the edge of the first cover plate and the length s of the end of the second insulating portion far from the first insulating portion protruding out of the edge of the second cover plate are set to be less than or equal to 2mm, which can not only achieve the purpose of preventing the first gap and the second gap from communicating, but also avoid the problem that the assembly between the first insulating member and other components is affected due to the overlong length of the first insulating member.

In some embodiments, the thickness t of the second insulating portion is greater than or equal to 0.5mm in the first direction.

In this embodiment, the thickness t of the second insulating portion is set to be greater than or equal to 0.5mm, so that the insulation between the first cover plate and the second cover plate can be effectively ensured, and sufficient strength can also be ensured.

In some embodiments, the length H of the first gap in a second direction perpendicular to the first direction is 0.8mm to 5mm; and/or the length H of the second gap is 0.8mm-5mm.

In the embodiment, the length H of the first gap is set to be 0.8mm-5mm, and/or the length H of the second gap is set to be 0.8mm-5mm, so that a heat affected zone of laser penetration in a welding process can be avoided, and the situation that the hidden metal debris is difficult to clean due to the fact that the length H of the first gap and/or the length H of the second gap are too long can be prevented.

In some embodiments, the first cover plate includes a first cover plate body embedded in the first case and a first connection portion disposed at a periphery of the first cover plate body, the first connection portion overlapping an edge of the first case and being connected with the first case to form a first connection, the second cover plate includes a second cover plate body embedded in the second case and a second connection portion disposed at a periphery of the second cover plate body, the second connection portion overlapping an edge of the second case and being connected with the second case to form a second connection.

The first connecting part is arranged on the periphery of the first cover plate main body, so that a special connecting part can be provided for the connection of the first cover plate and the first shell, and the influence of the connection of the first cover plate and the first shell on the first cover plate main body is reduced; moreover, the first cover main body is embedded in the first housing, so that the relative stability between the first cover main body and the first housing can be improved.

The second connecting part is arranged on the periphery of the second cover plate main body, so that a special connecting part can be provided for the connection of the second cover plate and the second shell, and the influence of the connection of the second cover plate and the second shell on the second cover plate main body is reduced; moreover, the second cover main body is embedded in the second housing, so that the relative stability between the second cover main body and the second housing can be improved.

In some embodiments, in the first direction, the thickness d1 of the first connection portion is greater than or equal to 0.3mm; and/or, in the first direction, the thickness d2 of the second connection portion is greater than or equal to 0.3mm.

In this embodiment, the thickness d1 of the first connecting portion is set to be greater than or equal to 0.3mm, and/or the thickness d2 of the second connecting portion is set to be greater than or equal to 0.3mm, so that it can be avoided that the thickness d1 of the first connecting portion and/or the thickness d2 of the second connecting portion are too small to cause the molten pool to turn into the first gap or the second gap during laser welding, and further scald the first insulating member or cause the first insulating member to melt.

In some embodiments, the first gap has a width W1 in the first direction, d1+ W1 ≧ 1mm; and/or in the first direction, the width of the second gap is W2, and d2+ W2 is more than or equal to 1mm.

In this embodiment, the sum of the thickness d1 of the first connecting portion and the width W1 of the first gap is set to be greater than or equal to 1mm, and/or the sum of the thickness d2 of the second connecting portion and the width W2 of the second gap is set to be greater than or equal to 1mm, so that the total thickness of the heat insulating region is outside the laser heat affected zone, and the safety of the first insulating member can be effectively ensured.

In some embodiments, the separator assembly further includes a first conductive member disposed on a side of the first cover plate away from the first insulating member, and a second conductive member including a limiting portion disposed on a side of the second cover plate away from the first insulating member, the first cover plate having a first through hole, the second cover plate having a second through hole, the first insulating member having a third through hole, and a main portion sequentially passing through the second through hole, the third through hole, and the first through hole and being connected to the first conductive member.

In this embodiment, the electrical connection between the first electrode assembly in the first case and the second electrode assembly in the second case is achieved through the first conductive member and the second conductive member.

In the radial direction of the second through hole, the size of the limiting part is larger than that of the main body part, so that the second conductive piece can be limited to move along the axis direction of the second through hole through the limiting part.

In some embodiments, the separator assembly further includes a second insulating member disposed between the first cover plate and the first conductive member, and a third insulating member disposed between the second cover plate and the limiting portion, the second insulating member having a fourth through hole, the third insulating member having a fifth through hole, the main body portion passing through the fourth through hole and the fifth through hole.

In this embodiment, the first cover plate and the first conductive member may be electrically isolated by the second insulating member; the second cover plate and the limiting part of the second conductive piece can be electrically isolated through the third insulating piece.

In a second aspect, the present application provides a battery cell, which includes a first case, a second case, a first electrode assembly disposed in a space defined by the first case and the first cover plate, a second electrode assembly disposed in a space defined by the second case and the second cover plate, and the above-mentioned separator assembly.

In a third aspect, the present application provides a battery including the above battery cell.

In a fourth aspect, the present application provides an electric device, comprising the above battery, wherein the battery is used for supplying electric energy to the electric device.

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

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic structural diagram of some embodiments of a powered device disclosed herein;

fig. 2 is a schematic structural view of some embodiments of the batteries disclosed herein;

fig. 3 is a schematic structural view of some embodiments of a battery cell as disclosed herein;

FIG. 4 isbase:Sub>A cross-sectional view taken along section A-A of FIG. 3;

FIG. 5 is an enlarged view at B in FIG. 4;

FIG. 6 is an exploded view of some embodiments of the baffle assembly disclosed herein;

FIG. 7 is a front view of some embodiments of the baffle assembly disclosed herein;

FIG. 8 is a cross-sectional view taken along section C-C of FIG. 7;

FIG. 9 is an enlarged view at D of FIG. 8;

FIG. 10 is a cross-sectional view of additional embodiments of the baffle assembly disclosed herein.

In the drawings, the drawings are not necessarily to scale.

Description of the labeling:

1000. a vehicle; 100. a battery; 200. an axle; 300. a wheel; 400. a motor; 500. a controller;

101. a battery cell; 102. a case assembly; 102a, a box body; 102b, a cover body;

10. a bulkhead assembly; 20. a first housing; 30. a second housing; 40. a first pole column; 50. a second pole; 60. a first electrode assembly; 60a, a first tab; 70. a second electrode assembly; 70a, a second tab;

1. a first cover plate; 11. a first cover plate main body; 12. a first connection portion; 13. a first through hole; 1a, a first connection site; 2. a second cover plate; 21. a second cover plate main body; 22. a second connecting portion; 23. a second through hole; 2a, a second junction; 3. a first insulating member; 31. a first insulating portion; 32. a second insulating section; 33. a first gap; 34. a second gap; 35. a third gap; 36. a third through hole; 4. a second insulating member; 41. a fourth via hole; 5. a third insulating member; 51. a fifth through hole; 6. a first conductive member; 61. an eighth through hole; 7. a second conductive member; 71. a limiting part; 72. a main body portion; 8. a first seal member; 81. a sixth through hole; 9. a second seal member; 91. a seventh via.

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 implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. Further, the term "vertical" is not strictly vertical, but is within an error allowance. "parallel" is not strictly parallel but within the tolerance of the error.

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 an associated 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 associated objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more unless specifically defined otherwise. Similarly, "a plurality of sets" refers to two or more sets, and "a plurality" refers to two or more pieces, unless otherwise specifically limited.

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 specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning a fixed connection, a detachable connection, or an integral connection; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. 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 present inventors have noted that, as the application range of power batteries is expanding, the demand of various electric devices for battery capacity is increasing.

In order to increase the capacity of the battery as much as possible in a limited storage space, the inventor believes that the battery cell may be configured to include two battery cells, the two battery cells are electrically connected, a part of the electrical connection component in the middle of the battery cell may be saved, and a part of the space may be saved for the battery, thereby providing support for increasing the capacity of the battery.

Through further research, the inventor finds that when two battery cells are electrically connected, two shells wrapping the two battery cells are also electrified, and if the two shells are electrically connected, the two shells are at the same potential, so that the two shells are corroded. Therefore, the application provides a partition plate assembly, the partition plate assembly is provided with an insulating part between two cover plates used for sealing the shell, the two shells can be effectively isolated through the insulating part, and then the two shells are prevented from being at the same potential, and the two shells are prevented from being corroded.

Specifically, referring to fig. 3 to 5, the separator assembly 10 includes a first cover plate 1 for closing a first case 20, a second cover plate 2 for closing a second case 30 with a first electrode assembly 60 disposed in the first case 20, and a first insulating member 3 disposed between the first cover plate 1 and the second cover plate 2 with the second electrode assembly 70 disposed in the second case 30.

By providing the first insulating member 3, the first case 20 closed by the first cover plate 1 and the second case 30 closed by the second cover plate 2 can be electrically isolated from each other, so that the first case 20 and the second case 30 are prevented from being electrically connected to each other and the first case 20 and the second case 30 are at the same potential, thereby preventing the first case 20 and the second case 30 from being corroded.

By adopting the embodiment of the separator assembly provided by the application, two electrode assemblies can be electrically connected (such as series connection, parallel connection, series-parallel connection and the like), so that the capacity of a single battery is increased, and the requirements of various electric devices on the battery capacity are met. Meanwhile, the first insulating part can prevent the two shells from being at the same potential and prevent the shells from being corroded.

The separator assembly disclosed in the embodiment of the application can be used in a battery cell or a battery with the separator assembly, and can also be used in an electric device powered by a power supply system consisting of the battery cell or the battery with the separator assembly, so that the related information of the battery can be conveniently acquired, and the electricity utilization condition of the electric device can be conveniently monitored.

The present embodiment provides an electric device using a battery as a power source, which may be a mobile phone, a portable device, a notebook computer, a battery car, an electric vehicle, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space plane, 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 vehicle toy, an electric ship toy, an electric plane toy, and the like, and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for a railway, 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.

For convenience of description, the following embodiments are described by taking an electric device according to an embodiment of the present application as an example of a vehicle 1000.

As shown in fig. 1, the electric device may be a vehicle 1000, such as a new energy vehicle, where the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle; or the electric device can be an unmanned aerial vehicle or a ship and the like. Specifically, the vehicle 1000 may include a battery 100, an axle 200, wheels 300 connected to the axle 200, a motor 400, and a controller 500, wherein the controller 500 is configured to control the operation of the motor 400, the motor 400 is configured to drive the axle 200 to rotate, the axle 200 rotates to drive the wheels 300 to rotate, and the battery 100 may be disposed at the bottom, head or tail of the vehicle 1000 to provide electric energy for the operation of the motor 400 and other components in the vehicle.

As shown in fig. 2, the battery 100 includes a battery cell 101 and a case assembly 102. In the battery 100, there may be one or a plurality of battery cells 101. If there are a plurality of battery cells 101, the plurality of battery cells 101 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 101 are connected in series or in parallel, or the plurality of battery cells 101 may be connected in series, in parallel, or in series-parallel to form a battery module, and the plurality of battery modules are connected in series, in parallel, or in series-parallel to form a whole, and are accommodated in the case assembly 102. Or all the battery cells 101 may be directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 101 is accommodated in the case assembly 102.

The case assembly 102 has a hollow structure inside, for example, the case assembly 102 may include a case 102a and a cover 102b. The case 102a and the cover 102b are fastened together. For example, the case 102a and the cover 102b may each be a hollow rectangular parallelepiped, only one surface of each of the case 102a and the cover 102b is an opening surface, the opening of the case 102a and the opening of the cover 102b are disposed opposite to each other, and the case 102a and the cover 102b are fastened to each other to form a case having a closed cavity. The case 102a may be a rectangular parallelepiped having an opening and the cover 102b may be plate-shaped, or the cover 102b may be a rectangular parallelepiped having an opening and the case 102a may be plate-shaped, and the case 102a and the cover 102b may be oppositely disposed and fastened to form the case assembly 102 having a closed chamber. At least one battery cell 101 is connected in parallel or in series-parallel combination, and then placed in a closed cavity formed by buckling the box body 102a and the cover body 102b.

The battery cell 101 includes a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present disclosure. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc., which is not limited in the embodiments of the present disclosure. 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, and the embodiment of the disclosure is not limited to the above.

In some embodiments provided herein, the battery cell includes a separator assembly 10, a first case 20, a second case 30, a first electrode assembly 60, and a second electrode assembly 70, the first electrode assembly 60 is disposed in a space defined by the first case 20 and the first cap plate 1, and the second electrode assembly 70 is disposed in a space defined by the second case 30 and the second cap plate 2.

Wherein, the first case 20 and the second case 30 each have an opening, the first electrode assembly 60 is accommodated inside a space defined by the first case 20 and the first cap plate 1, and the second electrode assembly 70 is accommodated inside a space defined by the second case 30 and the second cap plate 2.

The opening of the first casing 20 and the opening of the second casing 30 are disposed opposite to each other, and the diaphragm assembly 10 is disposed between the first casing 20 and the second casing 30.

The first and second housings 20 and 30 may be various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shapes of the first and second cases 20 and 30 may be determined according to the specific shapes and sizes of the first and second electrode assemblies 60 and 70. The first housing 20 and the second housing 30 may be identical in shape or different in shape. The material of the first housing 20 and the second housing 30 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

The first electrode assembly 60 and the second electrode assembly 70 are each composed of a positive electrode tab (not shown), a negative electrode tab (not shown), and a separator (not shown). The battery cell 101 operates by primarily relying on metal ions to move between the positive and negative plates. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the positive current collector which is not coated with the positive active substance layer protrudes out of the positive current collector which is coated with the positive active substance layer, and the positive current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the negative pole mass flow body protrusion in the negative pole mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer, and the negative pole mass flow body of not scribbling the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fusing does not occur through large current, the number of the positive electrode lugs is multiple and the negative electrode lugs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the first electrode assembly 60 and the second electrode assembly 70 may have a winding type structure or a lamination type structure; one of the first electrode assemblies 60 may be a winding type structure and the other may be a lamination type structure. The embodiments of the present application are not limited thereto.

The separator assembly 10 is used to electrically connect the first electrode assembly 60 and the second electrode assembly 70. Wherein the positive electrode tab of the first electrode assembly 60 and the negative electrode tab of the second electrode assembly 70 may be electrically connected through the separator assembly 10 to electrically connect the first electrode assembly 60 and the second electrode assembly 70; it is also possible that the negative electrode tab of the first electrode assembly 60 and the positive electrode tab of the second electrode assembly 70 are electrically connected through the separator assembly 10 to electrically connect the first electrode assembly 60 and the second electrode assembly 70; it is also possible that the negative electrode tabs of the first electrode assembly 60 and the negative electrode tabs of the second electrode assembly 70 are electrically connected through the separator assembly 10 to achieve the electrical connection of the first electrode assembly 60 and the second electrode assembly 70.

The battery cell 101 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 first electrode assembly 60 and the second electrode assembly 70 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc. The first and second housings 20 and 30 may be cylindrical, flat, rectangular parallelepiped, or other shapes, etc.

In some embodiments, the battery cell further includes a first pole post 40 and a second pole post 50, the first pole post 40 and the second pole post 50 being disposed at ends of the first housing 20 and the second housing 30, respectively, that are distal from each other. The first pole post 40 and the second pole post 50 are of opposite polarity.

The first case 20 and the second case 30 are filled with an electrolyte, respectively. The first electrode assembly 60 and the second electrode assembly 70 may each be formed by laminating or winding first and second pole pieces of opposite polarity, and a separator is typically provided between the first and second pole pieces. The coated portions of the first and second pole pieces constitute the main portions of the first and second electrode assemblies 60 and 70, and the uncoated portions of the first and second pole pieces each constitute two opposite polarity tabs. As shown in fig. 5, the first tab 60a of the first electrode assembly 60 and the second tab 70a of the second electrode assembly 70 are electrically connected through the separator assembly 10. Of course, the other tab of the first electrode assembly 60 is connected to the first pole 40, and the other tab of the second electrode assembly 70 is connected to the second pole 50.

In order to more clearly understand the improved principle of the battery cell of the present application, the structure of the separator assembly will be described in detail below.

In some embodiments, the separator assembly 10 includes a first cover plate 1, a second cover plate 2, and a first insulator 3, the first cover plate 1 for enclosing the first housing 20, the second cover plate 2 for enclosing the second housing 30, and the first insulator 3 disposed between the first cover plate 1 and the second cover plate 2.

In this embodiment, the first cap plate 1 is used to enclose the first case 20, and the first cap plate 1 and the first case 20 form a substantially enclosed space in which the first electrode assembly 60, the electrolyte, and other components can be accommodated. The second cap plate 2 serves to close the second case 30, and the second cap plate 2 and the second case 30 form a substantially closed space in which the second electrode assembly 70, the electrolyte, and other components can be accommodated.

The first and second housings 20 and 30 may be various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape and size of the first and second cases 20 and 30 may be determined according to the specific shape and size of the first and second electrode assemblies 60 and 70. The first housing 20 and the second housing 30 may be identical in shape or different in shape. The material of the first housing 20 and the second housing 30 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

The shape and size of the first cover plate 1 and the second cover plate 2 can be selected in many ways, for example, they can be circular, square, pentagonal or hexagonal, etc. Specifically, the shape and size of the first and second covers 1 and 2 may be determined according to the shape and size of the first and second cases 20 and 30. The first cover plate 1 and the second cover plate 2 may be identical in shape or different in shape. The first cover plate 1 and the second cover plate 2 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like, which is not limited in this embodiment.

The shape and size of the first insulating member 3 can be selected from various shapes, such as a circle, a square, a pentagon, a hexagon, etc. The shape and size of the first insulating member 3 may be the same as or different from those of the first cap plate 1 and the second cap plate 2. The material of the first insulating member 3 may be various materials, such as plastic, rubber, ceramic, etc., and the embodiment of the present invention is not limited thereto.

The first insulating member 3 is disposed between the first cover plate 1 and the second cover plate 2, and an orthographic area of the first cover plate 1 on the first insulating member 3 may be larger than, smaller than or equal to a surface area of the first insulating member 3. The orthographic area of the second cover plate 2 on the first insulating member 3 may be larger than, smaller than or equal to the surface area of the first insulating member 3.

Both sides of the first insulating member 3 may be in contact with the first and second cover plates 1 and 2, respectively; alternatively, the two sides of the first insulating member 3 may have gaps with the first cover plate 1 and the second cover plate 2, respectively, and other components may be disposed in the gaps.

By disposing the first insulating member 3 between the first cover plate 1 and the second cover plate 2, the first case 20 enclosed by the first cover plate 1 and the second case 30 enclosed by the second cover plate 2 can be electrically isolated to prevent the first case 20 and the second case 30 from being electrically connected to each other and the first case 20 and the second case 30 from being at the same potential, thereby preventing the first case 20 and the second case 30 from being corroded.

In the manufacturing process of a battery cell including two electrode assemblies, the quality of the connection of the separator assembly between the two motor assemblies is directly related to the quality of the entire battery cell.

The inventor of the invention has found that when the cover plate and the shell in the separator assembly are welded, the insulation member between the two cover plates may be heated to melt due to the high welding temperature, and the melt of the insulation member may affect the welding quality of the cover plate and the shell, even cause welding failure, thereby affecting the quality and performance of the whole battery cell. Moreover, the cover plate is provided with metal wire burrs, some scrap particles can be generated in the welding process of the cover plate and the shell, and the scrap particles splash around, so that the metal wires on the two cover plates can be lapped to cause short circuit, and the safety of the battery cells is influenced.

In order to avoid the melting of the insulating member and the influence on the welding quality of the cover plate and the shell, the inventor believes that the structure of the insulating member can be modified.

As shown in fig. 3, 4 and 5, in some embodiments, the first insulating member 3 includes a first insulating portion 31 and a second insulating portion 32, the second insulating portion 32 is disposed at an edge of the first insulating portion 31, a projection of the second insulating portion 32 on the first cover plate 1 along the first direction covers a first connection 1a between the first cover plate 1 and the first housing 20, and a first gap 33 is formed between a side surface of the second insulating portion 32 close to the first cover plate 1 and the first cover plate 1; and/or a projection of the second insulating part 32 on the second cover plate 2 along a first direction covers the second connection part 2a of the second cover plate 2 and the second housing 30, and a second gap 34 is formed between a side surface of the second insulating part 32 close to the second cover plate 2 and the second cover plate 2, wherein the first direction is a thickness direction of the first insulating member 3.

In this embodiment, the second insulating portion 32 is disposed at an edge of the first insulating portion 31, that is, the second insulating portion 32 is extended from the edge of the first insulating portion 31 to a direction away from the first insulating portion 31.

The second insulating portion 32 may be arranged along the edge of the first insulating portion 31 by one turn, by half turn, by more than half turn, by less than half turn, or the like, for example, the second insulating portion 32 is arranged at the edge of the first insulating portion 31 and occupies approximately 60 °, 90 °, 120 °, 180 °, 210 °, 270 °, 360 °, or the like in the circumferential direction. The second insulating portion 32 may be continuous or intermittent in the circumferential direction of the first insulating portion 31 (i.e., a plurality of second insulating portions 32 are arranged at intervals).

The first cover plate 1 and the first housing 20 may be connected by welding, bonding, or bolting. The second cover plate 2 and the second housing 30 may be connected by welding, bonding, or bolting. The connection between the first cover plate 1 and the first housing 20 may be the same as or different from the connection between the second cover plate 2 and the second housing 30.

A position where the first cover plate 1 and the first case 20 are coupled to each other is referred to as a first coupling portion 1a, and a position where the second cover plate 2 and the second case 30 are coupled to each other is referred to as a second coupling portion 2a.

The projection of the second insulating part 32 on the first cover plate 1 along the first direction covers the first connection 1a of the first cover plate 1 and the first housing 20, that is, in the first direction, the projection area of the second insulating part 32 is greater than or equal to the area occupied by the first connection 1a of the first cover plate 1 and the first housing 20, so that the second insulating part 32 can completely block and isolate the first connection 1a of the first cover plate 1 and the first housing 20.

The projection of the second insulating part 32 on the second cover plate 2 along the first direction covers the second connection 2a of the second cover plate 2 and the second housing 3, that is, the projection area of the second insulating part 32 in the first direction is greater than or equal to the area occupied by the second connection 2a of the second cover plate 2 and the second housing 30, so that the second insulating part 32 can completely block and isolate the second connection 2a of the second cover plate 2 and the second housing 30.

By providing the first gap 33 between the side surface of the second insulating portion 32 close to the first cover plate 1 and the first cover plate 1, the first connection point 1a of the first cover plate 1 and the first housing 20 can be spaced apart from the second insulating portion 32 of the first insulating member 3, for example, when the first cover plate 1 and the first housing 20 are connected by welding, the second insulating portion 32 of the first insulating member 3 can be prevented from being melted by heat due to being too close to the first connection point 1a of the first cover plate 1 and the first housing 20, and further, the welding quality between the first cover plate 1 and the first housing 20 can be prevented from being affected. When the first cover plate 1 and the first housing 20 are connected by bonding or bolting, the first connection part 1a of the first cover plate 1 and the first housing 20 is spaced apart from the second insulating part 32 of the first insulating member 3, so that the connection between the first cover plate 1 and the first housing 20 and the second insulating part 32 of the first insulating member 3 are prevented from interfering, and the connection between the first cover plate 1 and the first housing 20 is prevented from being affected or the second insulating part 32 is prevented from being damaged.

By providing the second gap 34 between the side surface of the second insulating portion 32 close to the second cover plate 2 and the second cover plate 2, the second connection portion 2a of the second cover plate 2 and the second housing 30 can be spaced apart from the second insulating portion 32 of the first insulating member 3, for example, when the first cover plate 1 and the first housing 20 are connected by welding, it can be avoided that the second insulating portion 32 of the first insulating member 3 is too close to the second connection portion of the second cover plate 2 and the second housing 30 and is melted by heat, thereby affecting the welding quality between the second cover plate 2 and the second housing 30. When the second cover plate 2 and the second case 30 are connected by bonding or bolting, the second connection part 2a of the second cover plate 2 and the second case 30 is spaced from the second insulating part 32 of the first insulating member 3, so that interference between the connection of the second cover plate 2 and the second case 30 and the second insulating part 32 of the first insulating member 3 can be avoided, and the connection of the second cover plate 2 and the second case 30 is affected or the second insulating part 32 is damaged.

Moreover, the projection of the second insulating portion 32 on the first cover plate 1 along the first direction covers the first connection 1a of the first cover plate 1 and the first housing 20, so that the second insulating portion 32 can block at least the chips generated when the first cover plate 1 and the first housing 20 are welded at the first connection 1 a; the projection of the second insulating portion 32 on the second cover plate 2 along the first direction covers the second connection 2a of the second cover plate 2 and the second housing 30, so that the second insulating portion 32 can also block the debris generated when the second cover plate 2 and the second housing 30 are welded at the second connection 2a. Therefore, by providing the second insulating portion 32, the first connection portion 1a and the second connection portion 2a can be isolated, and it is avoided that the metal wires on the two cover plates are overlapped to cause short circuit by the scrap particles generated when the first cover plate 1 and the first case 20 are welded at the first connection portion 1a or the scrap particles generated when the second cover plate 2 and the second case 30 are welded at the second connection portion 2a, thereby improving the safety performance of the battery cell.

In order to provide a first gap 33 between the side of the second insulating part 32 close to the first cover plate 1 and a second gap 34 between the side of the second insulating part 32 close to the second cover plate 2 and the second cover plate 2, various implementations may be used.

For example, in some embodiments, as shown in fig. 6, 7 and 8, two side surfaces of the first insulating portion 31 oppositely disposed in the first direction are respectively in contact with the first cap plate 1 and the second cap plate 2, and the thickness of the second insulating portion 32 is smaller than that of the first insulating portion 31; wherein the side of the second insulation part 32 facing the first cover plate 1 is further away from the first cover plate 1 than the side of the first insulation part 31 facing the first cover plate 1 to form a first gap 33 between the second insulation part 32 and the first cover plate 1; and/or the side of the second insulation part 32 facing the second cover plate 2 is further away from the second cover plate 2 than the side of the first insulation part 31 facing the second cover plate 2 to form a second gap 34 between the second insulation part 32 and the second cover plate 2.

When the first insulating portion 31 and the second insulating portion 32 are designed to have different thicknesses, the thickness of the second insulating portion 32 is smaller than that of the first insulating portion 31, and it can be understood that the maximum thickness of the second insulating portion 32 is smaller than the minimum thickness of the first insulating portion 31, so that it can be effectively ensured that the first gap 33 can be formed between the side of the second insulating portion 32 facing the first cover plate 1 and the first cover plate 1, or the second gap 34 can be formed between the side of the second insulating portion 32 facing the second cover plate 2 and the second cover plate 2.

Referring to fig. 9, the thickness of the second insulating portion 32 and the thickness of the first insulating portion 31 each refer to a dimension in a first direction perpendicular to the first cap plate 1, the second cap plate 2, and the first insulating member 3.

In this embodiment, by setting the thickness of the second insulating portion 32 to be smaller than the thickness of the first insulating portion 31, a first gap 33 is formed between the side of the second insulating portion 32 facing the first cap plate 1 and the first cap plate 1, and a second gap 34 is formed between the side of the second insulating portion 32 facing the second cap plate 2 and the second cap plate 2.

In this embodiment, the thickness of the second insulating portion 32 is smaller than that of the first insulating portion 31, and thus a step structure is formed on the first insulating member 3. The first gap 33 and/or the second gap 34 is formed by reducing the thickness of the second insulating portion 32, so that the structures of the first cover plate 1 and the second cover plate 2 can be kept unchanged, and the steps and the cost for structurally modifying the first cover plate 1 and the second cover plate 2 are saved.

In other embodiments, the thickness of the second insulating portion 32 is equal to or greater than the thickness of the first insulating portion 31 in the first direction, and the side of the first cap plate 1 facing the second insulating portion 32 is provided with a first groove to form a first gap 33; and/or the side of the second cover plate 2 facing the second insulation part 32 is provided with a second groove to form a second gap 34.

Here, when the first insulating portion 31 and the second insulating portion 32 are designed to have unequal thicknesses, the thickness of the second insulating portion 32 is smaller than that of the first insulating portion 31, and the thickness of the second insulating portion 32 is equal to or greater than that of the first insulating portion 31, it can be understood that the minimum thickness of the second insulating portion 32 is equal to or greater than that of the first insulating portion 31, so that the first gap 33 is formed by a first groove provided on a side surface of the first cap plate 1 facing the second insulating portion 32, or the second gap 34 is formed by a second groove provided on a side surface of the second cap plate 2 facing the second insulating portion 32.

In this embodiment, by providing the first groove on the first cover plate 1 to form the first gap 33 and providing the second groove on the second cover plate 2 to form the second gap 34, the structure of the first insulating member 3 can be maintained, and the step of structural modification of the first insulating member 3 and the cost can be saved.

In some embodiments, the second insulating portion 32 is arranged annularly along an edge of the first insulating portion 31. In this embodiment, the second insulating portion 32 is arranged within 360 ° of the circumference of the edge of the first insulating portion 31, thereby forming an annular shape.

By arranging the second insulating portion 32 in a ring shape along the edge of the first insulating portion 31, the first connection portion 1a and the second connection portion 2a can be completely isolated in the circumferential direction of the first insulating portion 31, and isolation failure caused by isolation leaks is avoided.

The overall shape of the second insulating portion 32 matches the shape of the first insulating portion 31 and the shapes of the first cover plate 1 and the second cover plate 2, for example, when the first cover plate 1 and the second cover plate 2 are square, the second insulating portion 32 has a square ring structure; when the first and second covers 1 and 2 are circular, the second insulating portion 32 has a circular ring structure or the like.

In some embodiments, the second insulating portion 32 and the first insulating portion 31 may be separately molded and joined together.

In other embodiments, the second insulating portion 32 and the first insulating portion 31 may be integrally formed. By providing the first insulating portion 31 and the second insulating portion 32 as an integral molding, a step of connecting the first insulating portion 31 and the second insulating portion 32 can be omitted, and it is also possible to avoid a connection reliability difference between the first insulating portion 31 and the second insulating portion 32 from affecting the overall structural strength of the first insulating member 3.

As shown in fig. 9, in some embodiments, the end of the second insulating portion 32 far from the first insulating portion 31 protrudes beyond the edge of the first cover plate 1; and/or the end of the second insulating part 32 far away from the first insulating part 31 protrudes out of the edge of the second cover plate 2.

In this embodiment, the end of the second insulating portion 32 far from the first insulating portion 31 protrudes beyond the edge of the first cover plate 1, that is, the length of the second insulating portion 32 is greater than the distance between the edge of the first cover plate 1 and the first insulating portion 31, and the end of the second insulating portion 32 far from the first insulating portion 31 is exposed from the edge of the first cover plate 1; the end of the second insulating portion 32 far from the first insulating portion 31 protrudes beyond the edge of the second cover plate 2, that is, the length of the second insulating portion 32 is greater than the distance between the edge of the second cover plate 2 and the first insulating portion 31, and the end of the second insulating portion 32 far from the first insulating portion 31 is exposed from the edge of the second cover plate 2.

In this embodiment, the end of the second insulating portion 32 away from the first insulating portion 31 is configured to protrude from the edge of the first cover plate 1, or the end of the second insulating portion 32 away from the first insulating portion 31 is configured to protrude from the edge of the second cover plate 2, so that the length of the first insulating member 3 is greater than the length of the first cover plate 1 and the second cover plate 2, thereby more effectively preventing the first gap 33 and the second gap 34 from communicating with each other, preventing debris particles generated during the welding process of the first cover plate 1 and the first case 20 from entering the second gap 34, or preventing debris particles generated during the welding process of the second cover plate 2 and the second case 30 from entering the first gap 33, and further preventing the wires on the first cover plate 1 and the second cover plate 2 from overlapping to cause short circuit.

In some embodiments, as shown in fig. 9, a dimension s of the end of the second insulating portion 32 away from the first insulating portion 31 protruding beyond the edge of the first cover plate 1 is less than or equal to 2mm; and/or the size s of the end part of the second insulating part 32 far away from the first insulating part 31 protruding out of the edge of the second cover plate 2 is less than or equal to 2mm.

As shown in fig. 9, a dimension s of the end of the second insulating portion 32 away from the first insulating portion 31 protruding beyond the edge of the first cover plate 1 is a dimension in the second direction. The second direction is perpendicular to the first direction. The dimension s may be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc.

Through a lot of experiments by the inventor, in this embodiment, the length dimension s of the end of the second insulating portion 32 away from the first insulating portion 31 protruding out of the edge of the first cover plate 1 and the length dimension s of the end of the second insulating portion 32 away from the first insulating portion 31 protruding out of the edge of the second cover plate 2 are set to be less than or equal to 2mm, which can achieve the purpose of preventing the first gap 33 and the second gap 34 from communicating with each other, and can prevent the first insulating member 3 from being too long to affect the assembly between the first insulating member and other components.

In some embodiments, the thickness t of the second insulating portion 32 is greater than or equal to 0.5mm in the first direction.

As shown in fig. 9, the thickness t of the second insulating portion 32 is a dimension in the first direction. The thickness t may be 0.5mm, 1mm, 1.5mm, 2mm, etc.

In this embodiment, the thickness t of the second insulating portion 32 is set to be greater than or equal to 0.5mm, so that the insulation between the first cover plate 1 and the second cover plate 2 can be effectively ensured, and sufficient strength can also be ensured.

In some embodiments, the length H1 of the first gap 33 is 0.8mm to 5mm; and/or the length H2 of the second gap 34 is 0.8mm to 5mm.

As shown in fig. 9, the length H1 of the first gap 33 and the length H2 of the second gap 34 are both dimensions in the second direction. H1 can be 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, and the like. H2 can be 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, and the like.

Through a lot of experiments of the inventor, in the embodiment, the length H1 of the first gap 33 is set to be 0.8mm-5mm, and/or the length H2 of the second gap 34 is set to be 0.8mm-5mm, so that a heat affected zone of laser penetration in the welding process can be avoided, and the situation that the length H1 of the first gap 33 and/or the length H2 of the second gap 34 is too long to cause that the hidden metal debris is difficult to clean can be prevented.

In some embodiments, the first cover plate 1 includes a first cover plate body 11 and a first connection portion 12 disposed at a periphery of the first cover plate body 11, the first cover plate body 11 is embedded in the inside of the first case 20, the first connection portion 12 is overlapped at an edge of the first case 20 and connected with the first case 20 to form a first connection portion 1a, the second cover plate 2 includes a second cover plate body 21 and a second connection portion 22 disposed at a periphery of the second cover plate body 21, the second cover plate body 21 is embedded in the inside of the second case 30, and the second connection portion 22 is overlapped at an edge of the second case 30 and connected with the second case 30 to form a second connection portion 2a.

In this embodiment, the first connection portion 12 is provided at the outer periphery of the first cover body 11, and the first connection portion 12 may be arranged along the outer periphery of the first cover body 11 by one circle, a half circle, more than a half circle, or less than a half circle, etc. in the circumferential direction, for example, the first connection portion 12 is arranged at the edge of the first cover body 11 and occupies a range of approximately 60 °, 90 °, 120 °, 180 °, 210 °, 270 °, 360 °, etc. in the circumferential direction. The first connection portions 12 may be continuous or intermittent in the circumferential direction of the first cover main body 11 (i.e., a plurality of first connection portions 12 are arranged at intervals).

The first cover body 11 is embedded in the first casing 20, and the first connecting portion 12 is disposed at the periphery of the first cover body 11, that is, the first connecting portion 12 extends from the outer edge of the first cover body 11 to the direction away from the first cover body 11, so that the first connecting portion 12 can be overlapped on the edge of the first casing 20, and the first connecting portion 12 and the first casing 20 are connected at the overlapped portion to form a first connection portion 1a.

The second connection portion 22 is provided at the outer periphery of the second cover main body 21, and the second connection portion 22 may be arranged along the outer periphery of the second cover main body 21 by one circle, a half circle, more than a half circle, or less than a half circle, etc. in the circumferential direction, for example, the second connection portion 22 is arranged at the edge of the second cover main body 21 and occupies a range of approximately 60 °, 90 °, 120 °, 180 °, 210 °, 270 °, 360 °, etc. in the circumferential direction. The second connection portion 22 may be continuous or intermittent in the circumferential direction of the second cover main body 21 (i.e., a plurality of second connection portions 22 are arranged at intervals).

The second cover body 21 is embedded in the second housing 30, and the second connecting portion 22 is disposed at the periphery of the second cover body 21, that is, the second connecting portion 22 extends from the outer edge of the second cover body 21 to the direction away from the second cover body 21, so that the second connecting portion 22 can be overlapped on the edge of the second housing 30, and the second connecting portion 22 and the second housing 30 are connected at the overlapped portion to form a second connection portion 2a.

By providing the first connecting portion 12 at the periphery of the first cover main body 11, a special connecting portion can be provided for the connection of the first cover 1 and the first housing 20, and the influence of the connection of the first cover 1 and the first housing 20 on the first cover main body 11 is reduced; further, the first cover main body 11 is embedded inside the first housing 20, and the relative stability between the first cover main body 11 and the first housing 20 can be improved.

By providing the second connecting portion 22 at the periphery of the second cover main body 21, a special connecting portion can be provided for the connection between the second cover 2 and the second housing 30, and the influence of the connection between the second cover 2 and the second housing 30 on the second cover main body 21 is reduced; further, the second cover main body 21 is fitted into the second housing 30, and the relative stability between the second cover main body 21 and the second housing 30 can be improved.

In some embodiments, in the first direction, the thickness d1 of the first connection portion 12 is greater than or equal to 0.3mm; and/or, in the first direction, the thickness d2 of the second connection portion 22 is greater than or equal to 0.3mm.

As shown in fig. 9, the thickness d1 of the first connection portion 12 and the thickness d2 of the second connection portion 22 are both dimensions in the first direction. d1 may be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. d2 may be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

Through a lot of experiments by the inventor, in this embodiment, when the thickness d1 of the first connection portion 12 is set to be greater than or equal to 0.3mm and/or the thickness d2 of the second connection portion 22 is set to be greater than or equal to 0.3mm, it can be avoided that the thickness d1 of the first connection portion 12 and/or the thickness d2 of the second connection portion 22 are too small, so that a molten pool is turned into the first gap 33 or the second gap 34 during laser welding, and further the first insulating member 3 is burned or the first insulating member 3 is melted.

In some embodiments, the first gap 33 has a width W1 in the first direction, d1+ W1 ≧ 1mm; and/or, in the first direction, the width of the second gap 34 is W2, and d2+ W2 is more than or equal to 1mm.

As shown in fig. 9, the width W1 of the first gap 33 and the width W2 of the second gap 34 are both dimensions in the first direction. d1+ W1 may be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc. d2+ W2 may be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc.

After a lot of experiments by the inventor, it is shown that in this embodiment, by setting the sum of the thickness d1 of the first connecting portion 12 and the width W1 of the first gap 33 to be greater than or equal to 1mm, and/or setting the sum of the thickness d2 of the second connecting portion 22 and the width W2 of the second gap 34 to be greater than or equal to 1mm, the total thickness of the heat insulating region can be made outside the laser heat affected region, and the safety of the first insulating member 3 can be effectively ensured.

In some embodiments, the separator plate assembly 10 further includes a first conductive member 6 and a second conductive member 7, the first conductive member 6 is disposed on a side of the first cover plate 1 away from the first insulating member 3, the second conductive member 7 includes a position-limiting portion 71 and a main body portion 72, the position-limiting portion 71 is disposed on a side of the second cover plate 2 away from the first insulating member 3, the first cover plate 1 is provided with a first through hole 13, the second cover plate 2 is provided with a second through hole 23, the first insulating member 3 is provided with a third through hole 36, and the main body portion 72 sequentially passes through the second through hole 23, the third through hole 36 and the first through hole 13 and is connected to the first conductive member 6.

The first conductive member 6 and the second conductive member 7 are members having a conductive function, and may be made of metal or the like. The specific shape and size of the first conductive member 6 and the second conductive member 7 can be flexibly set according to the needs. For example, the first conductive member 6 may have a circular shape, a square shape, or the like. The stopper portion 71 may be circular or square. The body portion 72 may be a cylinder, a triangular prism, a quadrangular prism, or the like. Specifically, the shape of the body portion 72 may be determined according to the shapes of the second through hole 23, the third through hole 36, and the first through hole 13.

In this embodiment, the electrical connection between the first electrode assembly 60 in the first case 20 and the second electrode assembly 70 in the second case 30 is achieved through the first conductive member 6 and the second conductive member 7.

In the radial direction of the second through hole 23, the size of the stopper portion 71 is larger than that of the main body portion 72, so that the movement of the second conductive member 7 in the axial direction of the second through hole 23 can be restricted by the stopper portion 71.

In some embodiments, the separator assembly 10 further includes a second insulating member 4 and a third insulating member 5, the second insulating member 4 is disposed between the first cover plate 1 and the first conductive member 6, the third insulating member 5 is disposed between the second cover plate 2 and the stopper portion 71, the second insulating member 4 is provided with a fourth through hole 41, the third insulating member 5 is provided with a fifth through hole 51, and the body portion 72 passes through the fourth through hole 41 and the fifth through hole 51.

In this embodiment, the shape and size of the second insulating member 4 and the third insulating member 5 can be selected in various ways, for example, the second insulating member 4 and the third insulating member 5 can be circular or square, etc. Specifically, the shapes of the second insulating member 4 and the third insulating member 5 may be matched with the shapes of the first cover plate 1, the second cover plate 2, and the first insulating member 3 to maintain the overall coordination of the diaphragm assembly 10. The second insulating member 4 and the third insulating member 5 may be made of plastic, rubber, or ceramic.

In this embodiment, the first cover plate 1 and the first conductive member 6 can be electrically isolated by the second insulating member 4; the second cover plate 2 and the stopper portion 71 of the second conductive member 7 may be electrically isolated by the third insulating member 5.

In some embodiments, the separator plate assembly 10 further includes a first sealing member 8, the first sealing member 8 is disposed between the first conductive member 6 and the second insulating member 4, the first sealing member 8 is provided with a sixth through hole 81, the body portion 72 passes through the sixth through hole 81, and the first sealing member 8 is axially embedded in the fourth through hole 41 and the first through hole 13 to isolate the first cover plate 1 and the first conductive member 6 and the first cover plate 1 and the body portion 72; and/or the partition plate assembly 10 further comprises a second sealing element 9, the second sealing element 9 is arranged between the limiting part 71 and the third insulating element 5, the second sealing element 9 is provided with a seventh through hole 91, the main body part 72 penetrates through the seventh through hole 91, and the second sealing element 9 is embedded into the fifth through hole 51 and the second through hole 23 along the axial direction so as to isolate the second cover plate 2 from the limiting part 71 and isolate the second cover plate 2 from the main body part 72.

In this embodiment, by providing the first seal member 8, it is possible to make the tight connection between the first conductive member 6 and the second insulating member 4 in the axial direction, isolate the first conductive member 6 and the first lid plate 1 in the axial direction, and isolate the body portions 72 of the first lid plate 1 and the second conductive member 7 in the radial direction. By providing the second sealing member 9, it is possible to make the tight connection between the stopper portion 71 of the second conductive member 7 and the third insulating member 5 in the axial direction, isolate the stopper portion 71 of the second conductive member 7 from the second cover plate 2 in the axial direction, and isolate the second cover plate 2 from the main body portion 72 of the second conductive member 7 in the radial direction.

The present application also provides embodiments, in which the first insulating member 3 is spaced apart from the connecting position of the cover plate and the housing by shortening the length of the first insulating member 3 to form a gap between the two cover plates at a position close to the edge, so as to effectively prevent the first insulating member 3 from being too close to the cover plate and being melted by heat, thereby affecting the welding quality of the cover plate and the housing.

As shown in fig. 10, a third gap 35 is formed between the first cover plate 1 and the second cover plate 2, the first cover plate 1 and the first housing 20 have a first connection point 1a, the second cover plate 2 and the second housing 30 have a second connection point 2a, and the first connection point 1a and the second connection point 2a are respectively located at two opposite sides of the third gap 35.

In this embodiment, although the first insulating member 3 is disposed between the first cap plate 1 and the second cap plate 2, the first insulating member 3 may be sized such that a third gap 35 is provided between the first cap plate 1 and the second cap plate 2, i.e., the first insulating member 3 is located outside the third gap 35, to isolate the first connection 1a and the first insulating member 3 and the second connection 2a and the first insulating member 3 by the third gap 35.

The specific size of the third gap 35 can be flexibly set according to actual conditions.

This embodiment can separate the first joint 1a from the second joint 2a by providing the third gap 35 between the first cover plate 1 and the second cover plate 2, and the first insulating member 3 is away from the third gap 35, so as to prevent the high temperature generated by the welding of the first joint 1a and the second joint 2a from melting the first insulating member 3, thereby preventing the melt of the first insulating member 3 from affecting the welding quality of the cover plate and the housing.

The structure of one embodiment of the baffle assembly 10 provided herein will now be described with reference to figures 3 to 9.

As shown in fig. 3 to 5, the battery cell includes a separator assembly 10, a first case 20, a second case 30, a first pole 40, a second pole 50, a first electrode assembly 60, and a second electrode assembly 70.

The diaphragm assembly 10 is disposed between the first casing 20 and the second casing 30. The first electrode assembly 60 is disposed in a space defined by the first case 20 and the first cap plate 1, and the second electrode assembly 70 is disposed in a space defined by the second case 30 and the second cap plate 2. The first pole 40 and the second pole 50 are respectively disposed at ends of the first housing 20 and the second housing 30 that are distant from each other. The first pole post 40 and the second pole post 50 are of opposite polarity. The first tab 60a of the first electrode assembly 60 and the second tab 70a of the second electrode assembly 70 are electrically connected through the separator assembly 10. The other tab of the first electrode assembly 60 is connected to the first pole 40, and the other tab of the second electrode assembly 70 is connected to the second pole 50.

Referring to fig. 5 to 8, the separator assembly 10 includes a first cap plate 1, a second cap plate 2, a first insulating member 3, a second insulating member 4, a third insulating member 5, a first conductive member 6, a second conductive member 7, a first sealing member 8, and a second sealing member 9.

The first cover plate 1 is used for enclosing the first housing 20, the second cover plate 2 is used for enclosing the second housing 30, and the first insulating member 3 is disposed between the first cover plate 1 and the second cover plate 2. The second insulating member 4 is disposed between the first cover plate 1 and the first conductive member 6, and the third insulating member 5 is disposed between the second cover plate 2 and the limiting portion 71 of the second conductive member 7.

The second conductive piece 7 comprises a limiting portion 71 and a main body portion 72, the limiting portion 71 is arranged on one side, far away from the first insulating piece 3, of the second cover plate 2, the first cover plate 1 is provided with a first through hole 13, the second cover plate 2 is provided with a second through hole 23, the first insulating piece 3 is provided with a third through hole 36, the second insulating piece 4 is provided with a fourth through hole 41, the third insulating piece 5 is provided with a fifth through hole 51, the first sealing piece 8 is provided with a sixth through hole 81, the second sealing piece 9 is provided with a seventh through hole 91, the first conductive piece 6 is provided with an eighth through hole 61, the main body portion 72 sequentially penetrates through the seventh through hole 91, the fifth through hole 51, the second through hole 23, the third through hole 36, the first through hole 13, the fourth through hole 41 and the sixth through hole 81, and is inserted into the eighth through hole 61 to be connected with the first conductive piece 6.

The first seal member 8 is axially inserted into the fourth through hole 41 and the first through hole 13 to isolate the first cover plate 1 and the first conductive member 6 and the first cover plate 1 and the body portion 72. The second seal member 9 is fitted into the fifth through hole 51 and the second through hole 23 in the axial direction to isolate the second lid plate 2 from the stopper portion 71 and the second lid plate 2 from the main body portion 72.

As shown in fig. 8, the first insulating member 3 includes a first insulating portion 31 and a second insulating portion 32, the second insulating portion 32 is disposed at an edge of the first insulating portion 31, a projection of the second insulating portion 32 on the first cover plate 1 along the first direction covers a first connection portion 1a of the first cover plate 1 and the first housing 20, and a thickness of the second insulating portion 32 is smaller than a thickness of the first insulating portion 31; wherein the side of the second insulation part 32 facing the first cover plate 1 is further away from the first cover plate 1 than the side of the first insulation part 31 facing the first cover plate 1 to form a first gap 33 between the second insulation part 32 and the first cover plate 1; a projection of the second insulating portion 32 onto the second cover plate 2 in the first direction covers the second connection 2a of the second cover plate 2 and the second housing 30, and a side of the second insulating portion 32 facing the second cover plate 2 is farther away from the second cover plate 2 than a side of the first insulating portion 31 facing the second cover plate 2 to form a second gap 34 between the second insulating portion 32 and the second cover plate 2.

The second insulating portion 32 is annularly arranged along an edge of the first insulating portion 31.

In this embodiment, the first cover plate 1, the second cover plate 2, and the first insulating member 3 are all rectangular in shape. The second insulating member 4 and the third insulating member 5 are both rectangular as a whole, and are respectively provided with a groove for accommodating the limiting portion 71 of the first conductive member 6 and the second conductive member 7.

As shown in fig. 9, a dimension s of the end of the second insulating portion 32 away from the first insulating portion 31 protruding beyond the edge of the first cover plate 1 is less than or equal to 2mm; the size s of the end of the second insulating part 32 far away from the first insulating part 31 protruding from the edge of the second cover plate 2 is less than or equal to 2mm.

In the first direction, the thickness t of the second insulating portion 32 is greater than or equal to 0.5mm.

The length H1 of the first gap 33 is 0.8mm-5mm; the length H2 of the second gap 34 is 0.8mm to 5mm.

The first cover plate 1 includes a first cover plate main body 11 and a first connection portion 12 disposed at the periphery of the first cover plate main body 11, the first cover plate main body 11 is embedded in the first casing 20, the first connection portion 12 is overlapped at the edge of the first casing 20 and connected with the first casing 20 to form a first connection portion 1a, the second cover plate 2 includes a second cover plate main body 21 and a second connection portion 22 disposed at the periphery of the second cover plate main body 21, the second cover plate main body 21 is embedded in the second casing 30, and the second connection portion 22 is overlapped at the edge of the second casing 30 and connected with the second casing 30 to form a second connection portion 2a.

In the first direction, the thickness d1 of the first connection portion 12 is greater than or equal to 0.3mm; in the first direction, the thickness d2 of the second connection portion 22 is greater than or equal to 0.3mm.

In the first direction, the width of the first gap 33 is W1, and d1+ W1 is more than or equal to 1mm; in the first direction, the width of the second gap 34 is W2, and d2+ W2 is greater than or equal to 1mm.

In the embodiment shown in fig. 10, the main difference from the embodiment shown in fig. 3 to 9 is that the length of the first insulating member 3 is smaller than the lengths of the first and second cover plates 1 and 2, so that a third gap 35 is formed between the first and second cover plates 1 and 2. This embodiment prevents the first insulating member 3 from being affected by a high temperature generated when the first cover plate 1 and the first case 20 are coupled or a high temperature generated when the second cover plate 2 and the second case 30 are coupled, by shortening the length of the first insulating member 3.

The utility model provides a baffle plate assembly embodiment can effectively keep apart first apron and second apron, avoids first insulator to be too near and be heated and melt apart from first junction between first apron 1 and first casing 20 or the second junction between second apron 2 and the second casing 30, and then influences the welding quality between first apron 1 and first casing 20 and between second apron 2 and the second casing 30.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. 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 (18)

1. A bulkhead assembly (10), comprising:

a first cover plate (1) for closing the first housing (20);

a second cover plate (2) for closing the second housing (30); and

a first insulator (3) disposed between the first cover plate (1) and the second cover plate (2).

2. The screen assembly (10) of claim 1, wherein a third gap (35) is provided between the first cover plate (1) and the second cover plate (2), the first cover plate (1) having a first junction (1 a) with the first housing (20), the second cover plate (2) having a second junction (2 a) with the second housing (30), the first junction (1 a) and the second junction (2 a) being located on opposite sides of the third gap (35), respectively.

3. The screen assembly (10) of claim 1, wherein the first insulating member (3) includes a first insulating portion (31) and a second insulating portion (32), the second insulating portion (32) being provided at an edge of the first insulating portion (31);

the projection of the second insulating part (32) on the first cover plate (1) along the first direction covers a first connection part (1 a) of the first cover plate (1) and the first shell (20), and a first gap (33) is arranged between the side surface of the second insulating part (32) close to the first cover plate (1) and the first cover plate (1); and/or the projection of the second insulating part (32) on the second cover plate (2) along a first direction covers a second connecting part (2 a) of the second cover plate (2) and the second shell (30), and a second gap (34) is formed between the side surface of the second insulating part (32) close to the second cover plate (2) and the second cover plate (2), wherein the first direction is the thickness direction of the first insulating piece (3).

4. The bulkhead assembly (10) according to claim 3, wherein the two side surfaces of the first insulating portion (31) disposed oppositely in the first direction are in contact with the first cover plate (1) and the second cover plate (2), respectively, and the thickness of the second insulating portion (32) is smaller than that of the first insulating portion (31);

wherein a side of the second insulation part (32) facing the first cover plate (1) is further away from the first cover plate (1) than a side of the first insulation part (31) facing the first cover plate (1) to form the first gap (33) between the second insulation part (32) and the first cover plate (1); and/or the side of the second insulation part (32) facing the second cover plate (2) is further away from the second cover plate (2) than the side of the first insulation part (31) facing the second cover plate (2) to form the second gap (34) between the second insulation part (32) and the second cover plate (2).

5. The bulkhead assembly (10) according to claim 3, wherein, in the first direction, the thickness of the second insulating portion (32) is equal to or greater than the thickness of the first insulating portion (31), and the side of the first cover plate (1) facing the second insulating portion (32) is provided with a first groove to form the first gap (33); and/or the side of the second cover plate (2) facing the second insulation part (32) is provided with a second groove to form the second gap (34).

6. The screen assembly (10) of claim 3, wherein the second insulating portion (32) is annularly arranged along an edge of the first insulating portion (31).

7. The bulkhead assembly (10) according to claim 3, wherein an end of the second insulation portion (32) remote from the first insulation portion (31) protrudes beyond an edge of the first cover plate (1); and/or the end part of the second insulating part (32) far away from the first insulating part (31) protrudes out of the edge of the second cover plate (2).

8. The bulkhead assembly (10) according to claim 3, wherein a dimension s of an end of the second insulating portion (32) remote from the first insulating portion (31) protruding beyond an edge of the first cover plate (1) is less than or equal to 2mm; and/or the size s of the end part of the second insulating part (32) far away from the first insulating part (31) protruding out of the edge of the second cover plate (2) is less than or equal to 2mm.

9. The bulkhead assembly (10) of claim 3, wherein the thickness t of the second insulation portion (32) in the first direction is greater than or equal to 0.5mm.

10. A bulkhead assembly (10) according to claim 3, wherein the length H1 of the first gap (33) is 0.8mm-5mm; and/or the length H2 of the second gap (34) is 0.8mm-5mm.

11. The screen assembly (10) according to claim 3, wherein the first screen (1) comprises a first screen body (11) and a first connection portion (12) provided at the periphery of the first screen body (11), the first screen body (11) is embedded in the interior of the first housing (20), the first connection portion (12) overlaps the edge of the first housing (20) and is connected with the first housing (20) to form the first connection (1 a), the second screen (2) comprises a second screen body (21) and a second connection portion (22) provided at the periphery of the second screen body (21), the second screen body (21) is embedded in the interior of the second housing (30), and the second connection portion (22) overlaps the edge of the second housing (30) and is connected with the second housing (30) to form the second connection (2 a).

12. The screen assembly (10) of claim 11, wherein in the first direction, the thickness d1 of the first connection portion (12) is greater than or equal to 0.3mm; and/or the thickness d2 of the second connecting part (22) in the first direction is greater than or equal to 0.3mm.

13. The screen assembly (10) of claim 12, wherein the first gap (33) has a width W1 in the first direction, d1+ W1 ≧ 1mm; and/or in the first direction, the width of the second gap (34) is W2, and d2+ W2 is more than or equal to 1mm.

14. The partition plate assembly (10) according to any one of claims 1 to 13, further comprising a first conductive member (6) and a second conductive member (7), wherein the first conductive member (6) is disposed on a side of the first cover plate (1) away from the first insulating member (3), the second conductive member (7) comprises a limiting portion (71) and a main body portion (72), the limiting portion (71) is disposed on a side of the second cover plate (2) away from the first insulating member (3), the first cover plate (1) is provided with a first through hole (13), the second cover plate (2) is provided with a second through hole (23), the first insulating member (3) is provided with a third through hole (36), and the main body portion (72) sequentially passes through the second through hole (23), the third through hole (36) and the first through hole (13) and is connected to the first conductive member (6).

15. The bulkhead assembly (10) according to claim 14, further comprising a second insulating member (4) and a third insulating member (5), the second insulating member (4) being disposed between the first cover plate (1) and the first conductive member (6), the third insulating member (5) being disposed between the second cover plate (2) and the stopper portion (71), the second insulating member (4) being provided with a fourth through hole (41), the third insulating member (5) being provided with a fifth through hole (51), the main body portion (72) passing through the fourth through hole (41) and the fifth through hole (51).

16. A battery cell comprising a first case (20), a second case (30), a first electrode assembly (60), a second electrode assembly (70), and the separator assembly (10) according to any one of claims 1 to 15, wherein the first electrode assembly (60) is disposed in a space defined by the first case (20) and the first cap plate (1), and the second electrode assembly (70) is disposed in a space defined by the second case (30) and the second cap plate (2).

17. A battery comprising the cell of claim 16.

18. An electrical consumer comprising the battery of claim 17, the battery configured to supply electrical energy to the electrical consumer.

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