CN216872190U

CN216872190U - Battery and consumer

Info

Publication number: CN216872190U
Application number: CN202220351345.1U
Authority: CN
Inventors: 孙占宇; 龙超; 王鹏; 陈兴地
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-07-01
Anticipated expiration: 2032-02-21

Abstract

The embodiment of the application provides a battery, electric equipment, a method for preparing the battery and equipment. The battery includes: a plurality of battery cells arranged in a first direction; the battery pack comprises a separator, wherein the separator extends along a first direction and is connected with a first wall of each battery unit in the plurality of battery units, the first wall is the wall with the largest surface area in the battery units, an insulating layer is arranged on the surface of the separator, and the size of the separator in a second direction is smaller than 0.5mm, and the second direction is perpendicular to the first wall. According to the technical scheme, the performance of the battery can be improved.

Description

Battery and consumer

Technical Field

The application relates to the technical field of batteries, in particular to a battery and electric equipment.

Background

With the increasing environmental pollution, the new energy industry is receiving more and more attention. In the new energy industry, battery technology is an important factor regarding its development.

The space utilization rate inside the battery affects the electric quantity and energy density of the battery, and further affects the performance of the battery. How to improve the performance of the battery is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a battery and electric equipment, which can improve the energy density of the battery and ensure the electric insulation in the battery at the same time, thereby improving the performance of the battery.

In a first aspect, a battery is provided, comprising: a plurality of battery cells arranged in a first direction; a separator extending in the first direction and connected to a first wall of each of the plurality of battery cells, the first wall having a largest surface area in the battery cell, a surface of the separator being provided with an insulating layer, wherein a dimension T1 of the separator in a second direction perpendicular to the first wall is less than 0.5 mm.

In the embodiment of the application, the separator is arranged in the battery and connected with the first wall with the largest surface area of each of a row of the plurality of battery units arranged along the first direction, and the size of the separator in the second direction perpendicular to the first wall is set to be less than 0.5 mm. The battery single bodies are connected into a whole through the partition plates, in this case, side plates and beams and other structures are not needed to be arranged in the battery, and the space utilization rate in the battery can be improved to a large extent; thereby improving the energy density of the battery; the surface of the separator is provided with the insulating layer, so that the separator is prevented from being electrically connected with the battery cell. Therefore, the technical scheme of the embodiment of the application can ensure the electrical insulation in the battery while improving the energy density of the battery, thereby improving the performance of the battery.

In one possible implementation, the dimension T1 of the partition in the second direction is not less than 0.05 mm. This can avoid the problem that the strength requirement of the battery cannot be satisfied due to the undersize of the separator in the second direction.

In one possible implementation, the area S1 of the surface of the separator connected to the first wall of the plurality of battery cells and the total area S2 of the first wall of the plurality of battery cells connected to the same side of the separator satisfy: 0.25 is less than or equal to S1/S2 is less than or equal to 4.

When the value of S1/S2 is too small, i.e., the area S1 of the surface of the separator connected to the first walls of the plurality of battery cells is much smaller than the total area S2 of the first walls of the plurality of battery cells connected to the same side of the separator, the contact area of the first walls with the separator is too small to satisfy the strength requirement of the battery; when the value of S1/S2 is too large, that is, the area S1 of the surface of the separator connected to the first wall is much larger than the total area S2 of the first walls of the plurality of battery cells connected to the same side of the separator, the separator occupies too much space inside the battery compared to the battery cells, which is not favorable for increasing the energy density of the battery; therefore, the value of S1/S2 is set to be 0.25-4, so that the energy density of the battery can be improved, and the strength of the battery can be improved.

In one possible implementation, in the third direction, the dimension H1 of the partition plate and the dimension H2 of the first wall of the battery cell satisfy: 0.2 ≦ H1/H2 ≦ 2, the third direction being perpendicular to the first direction and the second direction.

When the H1/H2 is too small, that is, the size H1 of the separator is much smaller than the size H2 of the first wall of the battery cell in the third direction, the contact area between the first wall and the separator is too small to meet the strength requirement of the battery; when H1/H2 is too big, namely in the third direction, the size H1 of the partition plate is far larger than the size H2 of the first wall of the battery cell, compared with the battery cell, the partition plate occupies too much space inside the battery, which is not beneficial to improving the energy density of the battery, therefore, the value of H1/H2 is set to be 0.2-2, which can improve the energy density of the battery and the strength of the battery.

In one possible implementation, in the first direction, the size L1 of the partition plate and the size L2 of the plurality of battery cells satisfy: L1/L2 is more than or equal to 0.5 and less than or equal to 2.

When L1/L2 is too small, i.e., the size L1 of the separator is much smaller than the size H2 of the first wall of the battery cell in the first direction, the contact area between the first wall and the separator is too small to meet the strength requirement of the battery; when H1/H2 is too big, namely in the first direction, the size H1 of the partition plate is far larger than the size H2 of the first wall of the battery cell, compared with the battery cell, the partition plate occupies too much space inside the battery, which is not beneficial to improving the energy density of the battery, therefore, the value of H1/H2 is set to be 0.5-2, which can improve the energy density of the battery and the strength of the battery.

In one possible implementation manner, a dimension T2 of the insulating layer in the second direction satisfies: t2 is more than or equal to 0.01mm and less than or equal to 0.3 mm.

When insulating layer size T2 on the second direction is too little, the insulating layer can' T effectively avoid the electric connection of battery monomer and baffle, the bad condition of insulation can appear in the battery, when insulating layer size T2 on the second direction is too big, can too much occupy the inside space of battery, be unfavorable for improving the energy density of battery, consequently, the value that sets up T2 is 0.01 ~ 0.3mm, so both can improve the energy density of battery, can guarantee the security of battery again.

In one possible implementation, the voltage U of the battery and the dimension T2 of the insulating layer in the second direction satisfy: T2/U is not less than 0.01X 10-3mm/V and not more than 3X 10-3 mm/V.

When T2/U is too small, namely the size T2 of the insulating layer of unit voltage in the second direction is too small, the insulating layer can not effectively avoid the electric connection of the battery monomer and the partition plate, the battery can have poor insulation, and potential safety hazards exist, when T2/U is too large, namely the size T2 of the insulating layer of unit voltage in the second direction is too large, the internal space of the battery can be excessively occupied, and the improvement of the energy density of the battery is not facilitated, so the value of T2/U is set to be 0.01 multiplied by 10 < -3 > to 3 multiplied by 10 < -3 > mm < -V >, the energy density of the battery can be improved, and the safety of the battery can be ensured.

In one possible implementation manner, the battery cell includes two first walls oppositely disposed in the second direction and two second walls oppositely disposed in the first direction, wherein in the first direction, the second walls of two adjacent battery cells are opposite.

In one possible implementation manner, the battery includes a plurality of rows of the battery cells and the separators arranged along the first direction, wherein the plurality of rows of the battery cells and the separators are alternately arranged in the second direction.

Therefore, the first walls of the plurality of battery cells arranged in each row along the first direction X can be connected with the partition plates, and the plurality of battery cells arranged in each row along the first direction X can be connected into a whole through the partition plates, so that the strength of the battery is effectively improved.

In one possible implementation manner, the battery includes a plurality of battery modules, the battery modules include at least one row of the plurality of battery cells and at least one separator arranged along the first direction, and the at least one row of the battery cells and the at least one separator are alternately arranged in the second direction. Like this, multiseriate battery monomer and a plurality of baffle interconnect form a whole, hold in the box, can enough carry out effectual fixed to each battery monomer, can guarantee the holistic energy density of battery again to can promote the performance of battery.

In a possible implementation manner, the battery module includes N rows of the battery cells and N-1 separators, the separator is disposed between two adjacent rows of the battery cells, and N is an integer greater than 1. In this way, fewer separators can be provided in the battery, while at the same time ensuring that each cell can be connected to a separator.

In one possible implementation manner, a plurality of the battery modules are arranged along the second direction, and a gap is formed between adjacent battery modules. The gap may provide an expansion space for the battery cell.

In a possible implementation, the partition is bonded to the first wall.

Through the mode of bonding with baffle and first wall fixed connection, simple structure, be convenient for processing and equipment.

In a second aspect, there is provided an electrical device comprising: the battery of the first aspect or any possible implementation manner of the first aspect, wherein the battery is used for providing electric energy.

In a third aspect, a method for preparing a battery is provided, comprising: providing a plurality of battery cells arranged in a first direction; providing a separator extending in the first direction and connected to a first wall of each of the plurality of battery cells, the first wall being a wall having a largest surface area in the battery cell, the surface of the separator being provided with an insulating layer, wherein a dimension T1 of the separator in a second direction perpendicular to the first wall is less than 0.5 mm.

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

Drawings

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 illustration of a vehicle according to an embodiment of the present disclosure;

fig. 2 is an exploded view of a battery according to an embodiment of the present disclosure;

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

FIG. 4 is a schematic diagram of a portion of a battery according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a portion of a battery according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a battery cell disclosed in an embodiment of the present application;

FIG. 7 is a schematic diagram of a portion of a battery disclosed in an embodiment of the present application;

fig. 8 is a schematic structural view of a battery module according to an embodiment of the present disclosure;

fig. 9 is a schematic structural view of a battery disclosed in an embodiment of the present application;

fig. 10 is a schematic flow chart of a method of manufacturing a battery according to an embodiment of the present application;

fig. 11 is a schematic block diagram of an apparatus for manufacturing a battery according to an embodiment of the present application.

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

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terminology used 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; "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

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

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in a packaging manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is also not limited to this.

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

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The single battery mainly depends on metal ions to move between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film can be polypropylene (PP), Polyethylene (PE) or the like. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

In order to meet different power requirements, a battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. Optionally, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted. The battery is further arranged in the electric equipment to provide electric energy for the electric equipment.

The development of battery technology should take into consideration various design factors such as energy density, cycle life, discharge capacity, charge and discharge rate, safety, etc. Under the condition that the internal space of the battery is fixed, the utilization rate of the internal space of the battery is improved, and the method is an effective means for improving the energy density of the battery. However, while improving the utilization of the internal space of the battery, there is a possibility that the structural strength of the battery may be reduced. For example, a beam for mounting a battery module is generally provided inside a case of a battery, and a side plate and an end plate are provided in a battery module. The beams, the side plates and the end plates occupy the internal space of the battery while realizing the fixation of the battery. However, if the beams, the side plates, and the end plates are not provided, the structural strength of the battery is insufficient, and the performance of the battery is impaired.

In view of this, an embodiment of the present application provides a technical solution, in which a separator is provided in a battery to be connected to a first wall having a largest surface area of each of a row of a plurality of battery cells arranged in a first direction, and a size of the separator in a second direction perpendicular to the first wall is set to be less than 0.5 mm. The battery single bodies are connected into a whole through the partition plates, in this case, side plates and beams and other structures are not needed to be arranged in the battery, and the space utilization rate in the battery can be improved to a large extent; thereby improving the energy density of the battery; the surface of the separator is provided with the insulating layer, so that the separator is prevented from being electrically connected with the battery cell. Therefore, the technical scheme of the embodiment of the application can guarantee the electrical insulation in the battery while promoting the energy density of the battery, thereby promoting the performance of the battery.

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

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

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

In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, as shown in fig. 2, the battery 10 may include a plurality of battery cells 20 for a structural schematic diagram of the battery 10 according to an embodiment of the present disclosure. The battery 10 may further include a case 11, the inside of the case 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in the case 11.

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

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

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

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

As shown in fig. 3, each electrode assembly 22 has a first tab 221a and a second tab 222 a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal by one connecting member 23, and the second tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal by another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab through one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab through the other connecting member 23.

In the battery cell 20, the electrode assembly 22 may be provided singly or in plurality according to actual use requirements, and as shown in fig. 3, 4 independent electrode assemblies 22 are provided in the battery cell 20.

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

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

Fig. 4 shows a schematic diagram of the structure of the battery 10 according to an embodiment of the present application. As shown in fig. 4 (a), the battery 10 includes a plurality of battery cells 20 arranged in a first direction X, and a separator 101, the separator 101 extending in the first direction X and being connected to a first wall 201 of each of the plurality of battery cells 20, the first wall 201 being a wall having a largest surface area in the battery cell 20.

In this way, the first wall 201, which has the largest surface area, of each of the plurality of battery cells 20 is connected to the partition plate 101, and the plurality of battery cells 20 are connected to form a whole through the partition plate 101, in this case, there is no need to provide a side plate in the battery 10, or there is no need to provide a beam or other structure, so that the space utilization rate inside the battery 10 can be greatly improved, and the energy density of the battery 10 can be improved.

In the present embodiment, as shown in fig. 4 (b), a dimension T1 of the partition 101 in the second direction Y perpendicular to the first wall 201 is less than 0.5 mm.

This can prevent the separator 101 from occupying too much space inside the battery 10 due to its too large dimension in the second direction Y, and further improve the space utilization inside the battery 10, thereby improving the energy density of the battery 10.

In the embodiment of the present application, as shown in fig. 4 (c), the insulating layer 102 is provided on the surface of the separator 101, so that the electrical connection between the separator 101 and the battery cell 20 is prevented, and the safety of the battery 10 is improved. Alternatively, the insulating layer 102 may be an insulating film adhered to the surface of the separator 101 or an insulating varnish coated on the surface of the separator 101.

In the embodiment of the present application, a dimension T2 of the insulating layer 102 in the second direction Y satisfies: t2 is more than or equal to 0.01mm and less than or equal to 0.3 mm.

When the dimension T2 of the insulating layer 102 in the second direction Y is too small, the insulating layer 102 cannot effectively avoid the electrical connection between the battery cell 20 and the separator 101, and the battery 10 may have poor insulation, which is a potential safety hazard, and when the dimension T2 of the insulating layer 102 in the second direction Y is too large, the insulating layer may occupy too much space inside the battery 10, which is not beneficial to improving the energy density of the battery 10, so the value of T2 is set to be 0.01-0.3 mm, which can improve the energy density of the battery 10 and ensure the safety of the battery 10.

In the embodiment of the present application, the voltage U of the battery 10 and the dimension T2 of the insulating layer 102 in the second direction Y satisfy: T2/U is more than or equal to 0.01X 10-3mm/V and less than or equal to 3X 10-3 mm/V.

The insulation effect of the insulation layer 102 is related to not only the thickness of the insulation layer 102, but also the thickness of the insulation layer 102 corresponding to the unit voltage, when T2/U is too small, that is, when the dimension T2 of the insulation layer 102 of the unit voltage in the second direction Y is too small, the insulation layer 102 cannot effectively avoid the electrical connection between the battery cell 20 and the separator 101, the battery 10 may have poor insulation, and there is a safety hazard, and when T2/U is too large, that is, the dimension T2 of the insulation layer 102 of the unit voltage in the second direction Y is too large, the insulation layer 102 may occupy too much space inside the battery 10, which is not beneficial to improving the energy density of the battery 10, so the value of T2/U is set to be 0.01 × 10-3 to 3 × 10-3mm/V, which not only can improve the energy density of the battery 10, but also can ensure the safety of the battery 10.

In the embodiment of the present application, the dimension T1 of the partition 101 in the second direction Y is not less than 0.05 mm. This can avoid the problem that the rigidity of the separator 101 is small and the strength requirement of the battery 10 cannot be satisfied because the size of the separator 101 in the second direction is too small, that is, the thickness of the separator 101 is small.

In the embodiment of the present application, the area S1 of the surface of the separator 101 connected to the first walls 201 of the plurality of battery cells 20 and the total area S2 of the first walls 201 of the plurality of battery cells 20 connected to the same side of the separator 101 satisfy: 0.25-S1/S2-4, wherein S1-H1-L1 and S2-H2-L2. As shown in fig. 5, H1 is the size of the separator 101 in the third direction Z, L1 is the size of the separator 101 in the first direction X, H2 is the size of a single battery cell 20 in the third direction Z, and L2 is the sum of the sizes of the plurality of battery cells 20 in the first direction X.

When the value of S1/S2 is too small, that is, the area S1 of the surface of the separator 101 connected to the first walls 201 of the plurality of battery cells 20 is much smaller than the total area S2 of the first walls 201 of the plurality of battery cells 20 connected to the same side of the separator 101, the contact area of the first walls 201 with the separator 101 is too small to satisfy the strength requirement of the battery 10; when the value of S1/S2 is too large, that is, the area S1 of the surface of the separator 101 connected to the first wall 201 is much larger than the total area S2 of the first walls 201 of the plurality of battery cells 20 connected to the same side of the separator 101, the separator 101 occupies too much space inside the battery 10 compared to the battery cells 20, which is not favorable for increasing the energy density of the battery 10; therefore, the value of S1/S2 is set to be 0.25-4, so that the energy density of the battery 10 can be improved, and the strength of the battery 10 can be improved.

In the embodiment of the present application, as shown in fig. 5, in the third direction Z, the dimension H1 of the separator 101 and the dimension H2 of the first wall 201 of the battery cell 20 satisfy: H1/H2 is not less than 0.2 and not more than 2, and the third direction Z is perpendicular to the first direction X and the second direction Y.

When H1/H2 is too small, that is, the dimension H1 of the separator 101 is much smaller than the dimension H2 of the first wall 201 of the battery cell 20 in the third direction Z, the contact area between the first wall 201 and the separator 101 is too small to satisfy the strength requirement of the battery 10; when H1/H2 is too large, that is, in the third direction Z, the size H1 of the partition board 101 is much larger than the size H2 of the first wall 201 of the battery cell 20, compared with the battery cell 20, the partition board 101 occupies too much space inside the battery 10, which is not favorable for increasing the energy density of the battery 10, and therefore, the value of H1/H2 is set to be 0.2-2, which can increase the energy density of the battery 10 and the strength of the battery 10.

In the embodiment of the present application, as shown in fig. 5, in the first direction X, the dimension L1 of the separator 101 and the dimension L2 of the plurality of battery cells 20 satisfy: L1/L2 is more than or equal to 0.5 and less than or equal to 2.

When L1/L2 is too small, i.e., the dimension L1 of the separator 101 is much smaller than the dimension H2 of the first wall 201 of the battery cell 20 in the first direction X, the contact area of the first wall 201 and the separator 101 is too small to satisfy the strength requirement of the battery 10; when H1/H2 is too large, that is, in the first direction X, the dimension H1 of the partition board 101 is much larger than the dimension H2 of the first wall 201 of the battery cell 20, compared with the battery cell 20, the partition board 101 occupies too much space inside the battery 10, which is not favorable for increasing the energy density of the battery 10, and therefore, the value of H1/H2 is set to be 0.5-2, which can increase the energy density of the battery 10 and the strength of the battery 10.

In the embodiment of the present application, as shown in fig. 6, the battery cell 20 includes two first walls 201 oppositely disposed in the second direction Y and two second walls 202 oppositely disposed in the first direction X, wherein the second walls 202 of two adjacent battery cells 20 are opposite in the first direction X.

In the embodiment of the present application, as shown in fig. 7, the battery 10 includes a plurality of rows of the plurality of battery cells 20 and the plurality of separators 101 arranged in the first direction X, wherein the plurality of rows of the battery cells 20 and the plurality of separators 101 are alternately arranged in the second direction Y.

In this way, the first walls 201 of the plurality of battery cells 20 arranged in each row along the first direction X may be connected to the partition plate 101, and the plurality of battery cells 20 arranged in each row along the first direction X may be connected to be integrated by the partition plate 101, so as to effectively improve the strength of the battery 10.

In the present embodiment, the battery 10 includes a plurality of battery modules 100, and as shown in fig. 8, the battery module 100 includes at least one row of the plurality of battery cells 20 arranged in the first direction X and at least one separator 101, and the at least one row of the battery cells 20 and the at least one separator 101 are alternately arranged in the second direction Y.

In the embodiment of the present application, the battery module 100 includes N rows of the battery cells 20 and N-1 separators 101, the separators 101 are disposed between two adjacent rows of the battery cells 20, and N is an integer greater than 1. As shown in fig. 9, N is 2.

In the embodiment of the present application, as shown in fig. 9, a plurality of battery modules 100 are arranged in the second direction Y with a gap between adjacent battery modules 100.

Alternatively, the end of the partition board 101 in the first direction X is provided with a fixing structure 103, and the fixing structure 103 is connected with a fixing member 104 at the end of the partition board 101 in the first direction X to fix the partition board 101.

In the present embodiment, the partition 101 is bonded to the first wall 201. The partition board 101 is fixedly connected with the first wall 201 in a bonding mode, so that the structure is simple, and the processing and the assembly are convenient.

It should be understood that the partition 101 and the first wall 201 may also be connected by other means, such as riveting, welding, etc., and the present application is not limited thereto.

An embodiment of the present application also provides a powered device, which may include the battery 10 in the foregoing embodiments. Optionally, the electric device may be a vehicle 1, a ship, a spacecraft, or the like, but the embodiment of the present application is not limited thereto.

The battery 10 and the electric device according to the embodiment of the present application are described above, and the method and the device for manufacturing the battery 10 according to the embodiment of the present application are described below, wherein the parts not described in detail can be referred to the foregoing embodiments.

Fig. 10 shows a schematic flow diagram of a method 300 of preparing the battery 10 of one embodiment of the present application. As shown in fig. 10, the method 300 may include:

310 providing a plurality of battery cells 20 arranged in a first direction X;

and 320, providing a separator 101, wherein the separator 101 extends along a first direction X and is connected with a first wall 201 of each battery unit 20 in the plurality of battery units 20, the first wall 201 is the wall with the largest surface area in the battery unit 20, and the surface of the separator 101 is provided with an insulating layer 102, wherein the dimension T1 of the separator 101 in a second direction Y is less than 0.5mm, and the second direction Y is perpendicular to the first wall 201.

Fig. 11 shows a schematic block diagram of an apparatus 400 for preparing the battery 10 according to an embodiment of the present application. As shown in fig. 11, the apparatus 400 for preparing the battery 10 may include: a module 410 is provided.

A module 410 is provided for providing a plurality of battery cells 20 and a separator 101 arranged along a first direction X, the separator 101 extending along the first direction X and being connected to a first wall 201 of each battery cell 20 of the plurality of battery cells 20, the first wall 201 being the largest surface area wall of the battery cell 20, the surface of the separator 101 being provided with an insulating layer 102, wherein a dimension T1 of the separator 101 in a second direction Y, which is perpendicular to the first wall 201, is less than 0.5 mm.

Hereinafter, examples of the present application will be described. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the present disclosure. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.

The battery cell 20 and the separator 101 shown in the drawing were used to perform a separator anti-vibration impact test under the standard of GB 38031-. In table 1, T1 is the size of the separator in the second direction Y, H1 is the size of the separator in the third direction Z, L1 is the size of the separator in the first direction X, H2 is the size of a single battery cell in the third direction Z, L2 is the sum of the sizes of a plurality of battery cells in the first direction X, S1 is H1L 1, and S2 is H2L 2.

TABLE 1

By adopting the battery cell 20 and the separator 101 shown in the attached drawing, and referring to IEC 60664-1, 1000VDC is applied in an insulation test, and the insulation resistance value is more than or equal to 500M omega; the withstand voltage test is carried out under the conditions that 2700VDC is applied and 60S is kept, the leakage current is less than or equal to 1mA, and the insulation withstand voltage capability of the partition board is tested, and the test results are shown in Table 2. T2 in table 2 is the dimension of the insulating layer in the second direction Y, and U is the cell voltage.

TABLE 2

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

1. A battery (10), comprising:

a plurality of battery cells (20) arranged in a first direction;

a separator (101), wherein the separator (101) extends along the first direction and is connected with a first wall (201) of each battery cell (20) in the plurality of battery cells (20), the first wall (201) is the wall with the largest surface area in the battery cells (20), and an insulating layer (102) is arranged on the surface of the separator (101);

wherein the dimension T1 of the partition (101) in a second direction perpendicular to the first wall (201) is less than 0.5 mm.

2. The battery (10) according to claim 1, wherein a dimension T1 of the separator (101) in the second direction is not less than 0.05 mm.

3. The battery (10) according to claim 1, wherein an area S1 of a surface of the separator (101) connected to the first walls (201) of the plurality of battery cells (20) and a total area S2 of the first walls (201) of the plurality of battery cells (20) connected to the same side of the separator (101) satisfy: 0.25 is less than or equal to S1/S2 is less than or equal to 4.

4. The battery (10) according to claim 1, wherein, in a third direction, a dimension H1 of the separator (101) and a dimension H2 of the first wall (201) of the battery cell (20) satisfy: 0.2 ≦ H1/H2 ≦ 2, the third direction being perpendicular to the first direction and the second direction.

5. The battery (10) according to claim 1, wherein a dimension L1 of the separator (101) and a dimension L2 of the plurality of battery cells (20) satisfy, in the first direction: L1/L2 is more than or equal to 0.5 and less than or equal to 2.

6. The battery (10) of claim 1, wherein a dimension T2 of the insulating layer (102) in the second direction satisfies: t2 is more than or equal to 0.01mm and less than or equal to 0.3 mm.

7. The battery (10) of claim 1, wherein the voltage U of the battery (10) and the dimension T2 of the insulating layer (102) in the second direction satisfy: T2/U is not less than 0.01X 10-3mm/V and not more than 3X 10-3 mm/V.

8. The battery (10) according to claim 1, wherein the battery cell (20) comprises two first walls (201) oppositely disposed in the second direction and two second walls (202) oppositely disposed in the first direction, wherein the second walls (202) of two adjacent battery cells (20) are opposite in the first direction.

9. The battery (10) according to claim 1, wherein the battery (10) comprises a plurality of rows of the plurality of battery cells (20) and the plurality of separators (101) arranged in the first direction, wherein the plurality of rows of the battery cells (20) and the plurality of separators (101) are alternately arranged in the second direction.

10. The battery (10) according to claim 1, wherein the battery (10) comprises a plurality of battery modules (100), the battery modules (100) comprise at least one column of the plurality of battery cells (20) arranged in the first direction and at least one separator (101), and at least one column of the battery cells (20) and at least one separator (101) are alternately arranged in the second direction.

11. The battery (10) according to claim 10, wherein the battery module (100) comprises N rows of the battery cells (20) and N-1 separators (101), the separators (101) being disposed between two adjacent rows of the battery cells (20), N being an integer greater than 1.

12. The battery (10) according to claim 10, wherein a plurality of the battery modules (100) are arranged in the second direction with a gap between adjacent battery modules (100).

13. Battery (10) according to any of the claims 1 to 12, characterized in that the separator (101) is glued to the first wall (201).

14. An electrical device, comprising: the battery (10) according to any one of claims 1 to 13, the battery (10) being for providing electrical energy.