Battery, electrical device, method and device for preparing battery

Abstract

The present invention provides a battery, an electrical device, and a method and apparatus for manufacturing the battery. The battery comprises: a plurality of battery cells arranged along a first direction; a separator extending along the first direction and connected to the first wall of each of the plurality of battery cells, the first wall having the largest surface area of the battery cell; an insulating layer disposed on the surface of the separator; and a dimension of the separator in a second direction perpendicular to the first wall of the battery cell of less than 0.5 mm. The technical solutions of the present invention can improve battery performance.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, an electrical device, and a method and device for preparing a battery. Background Art

[0002] With the increasing severity of environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor in its development.

[0003] The space utilization rate within a battery affects its charge and energy density, which in turn affects its performance. Improving battery performance is a pressing technical issue in battery technology. Summary of the Invention

[0004] The embodiments of the present application provide a battery, an electrical device, and a method and device for preparing a battery, which can increase the energy density of the battery while ensuring electrical insulation in the battery, thereby improving the performance of the battery.

[0005] In a first aspect, a battery is provided, comprising: a plurality of battery cells arranged along a first direction; a partition, the partition extending along the first direction and connected to a first wall of each of the plurality of battery cells, the first wall being the wall with the largest surface area in the battery cells, an insulating layer being provided on a surface of the partition, wherein a dimension T1 of the partition in a second direction is less than 0.5 mm, and the second direction is perpendicular to the first wall.

[0006] In an embodiment of the present application, a partition is provided in the battery, connected to the first wall with the largest surface area of each battery cell in a row of multiple battery cells arranged along a first direction, and the size of the partition in a second direction perpendicular to the first wall is set to be less than 0.5 mm. Multiple battery cells are connected into a whole by a partition. In this case, side panels and beams are no longer required in the battery, which can greatly improve the space utilization inside the battery and thereby increase the energy density of the battery. By providing an insulating layer on the surface of the partition, electrical connection between the partition and the battery cells is avoided. Therefore, the technical solution of the embodiment of the present application can improve the energy density of the battery while ensuring electrical insulation in the battery, thereby improving the performance of the battery.

[0007] In a possible implementation, the dimension T1 of the separator in the second direction is not less than 0.05 mm, so as to avoid the situation where the dimension of the separator in the second direction is too small and cannot meet the strength requirements of the battery.

[0008] In one possible implementation, an area S1 of a surface of the separator connected to the first walls of the battery cells and a total area S2 of the first walls of the battery cells connected to the same side of the separator satisfy: 0.25≤S1 / S2≤4.

[0009] When the value of S1 / S2 is too small, that is, the area S1 of the surface of the partition connected to the first walls of multiple battery cells is much smaller than the total area S2 of the first walls of multiple battery cells connected to the same side of the partition, the contact area between the first wall and the partition is too small to meet the strength requirements of the battery; when the value of S1 / S2 is too large, that is, the area S1 of the surface of the partition connected to the first wall is much larger than the total area S2 of the first walls of multiple battery cells connected to the same side of the partition, compared with the battery cells, the partition occupies too much space inside the battery, which is not conducive to improving the energy density of the battery; therefore, the value of S1 / S2 is set to 0.25~4, which can not only improve the energy density of the battery, but also improve the strength of the battery.

[0010] In a possible implementation, in a third direction, a size H1 of the separator and a size H2 of the first wall of the battery cell satisfy: 0.2≤H1 / H2≤2, and the third direction is perpendicular to the first direction and the second direction.

[0011] When H1 / H2 is too small, that is, in the third direction, the size H1 of the partition is much smaller than the size H2 of the first wall of the battery cell, the contact area between the first wall and the partition is too small to meet the strength requirements of the battery; when H1 / H2 is too large, that is, in the third direction, the size H1 of the partition is much larger than the size H2 of the first wall of the battery cell, the partition occupies too much space inside the battery compared to the battery cell, which is not conducive to improving the energy density of the battery. Therefore, setting the value of H1 / H2 to 0.2~2 can not only improve the energy density of the battery, but also improve the strength of the battery.

[0012] In a possible implementation, in the first direction, a size L1 of the separator and a size L2 of the plurality of battery cells satisfy: 0.5≤L1 / L2≤2.

[0013] When L1 / L2 is too small, that is, in the first direction, the size L1 of the partition is much smaller than the size L2 of the first wall of the battery cell, the contact area between the first wall and the partition is too small to meet the strength requirements of the battery; when L1 / L2 is too large, that is, in the first direction, the size L1 of the partition is much larger than the size L2 of the first wall of the battery cell, compared with the battery cell, the partition occupies too much space inside the battery, which is not conducive to improving the energy density of the battery. Therefore, the value of L1 / L2 is set to 0.5~2, which can not only improve the energy density of the battery, but also improve the strength of the battery.

[0014] In a possible implementation, a dimension T2 of the insulating layer in the second direction satisfies: 0.01 mm ≤ T2 ≤ 0.3 mm.

[0015] When the dimension T2 of the insulating layer in the second direction is too small, the insulating layer cannot effectively prevent the electrical connection between the battery cell and the separator, and the battery will have poor insulation. When the dimension T2 of the insulating layer in the second direction is too large, it will occupy too much space inside the battery, which is not conducive to improving the energy density of the battery. Therefore, the value of T2 is set to 0.01~0.3mm, which can not only improve the energy density of the battery, but also ensure the safety of the battery.

[0016] In a possible implementation, the voltage U of the battery and the dimension T2 of the insulating layer in the second direction satisfy: 0.01×10-3 mm / V≤T2 / U≤3×10-3 mm / V.

[0017] When T2 / U is too small, that is, the dimension T2 of the insulating layer in the second direction per unit voltage is too small, the insulating layer cannot effectively prevent the electrical connection between the battery cell and the separator, and the battery will have poor insulation, posing a safety hazard. When T2 / U is too large, that is, the dimension T2 of the insulating layer in the second direction per unit voltage is too large, it will occupy too much space inside the battery, which is not conducive to improving the energy density of the battery. Therefore, the value of T2 / U is set to 0.01×10-3~3×10-3mm / V, which can not only improve the energy density of the battery, but also ensure the safety of the battery.

[0018] In a possible implementation, the battery cell includes two first walls arranged opposite to each other in the second direction and two second walls arranged opposite to each other in the first direction, wherein the second walls of two adjacent battery cells are opposite to each other in the first direction.

[0019] In a possible implementation, the battery includes multiple columns of the battery cells and the separators arranged along the first direction, wherein the multiple columns of the battery cells and the separators are alternately arranged in the second direction.

[0020] In this way, the first walls of the multiple battery cells in each column arranged along the first direction can be connected to the separator, and the multiple battery cells in each column arranged along the first direction can be connected into a whole through the separator, thereby effectively improving the strength of the battery.

[0021] In one possible implementation, the battery includes multiple battery modules, each of which includes at least one column of multiple battery cells arranged along the first direction and at least one separator, with the at least one column of battery cells and at least one separator alternately arranged along the second direction. In this way, the multiple columns of battery cells and the multiple separators are interconnected to form a single unit housed within the housing, effectively securing each column of battery cells while ensuring the overall energy density of the battery, thereby improving battery performance.

[0022] In one possible implementation, the battery module includes N columns of battery cells and N-1 separators, with the separators disposed between two adjacent columns of battery cells, where N is an integer greater than 1. In this way, fewer separators can be disposed within the battery while ensuring that each battery cell can be connected to a separator.

[0023] In a possible implementation, the plurality of battery modules are arranged along the second direction, with gaps between adjacent battery modules, and the gaps can provide expansion space for the battery cells.

[0024] In a possible implementation manner, the partition is bonded to the first wall.

[0025] The partition is fixedly connected to the first wall by bonding, which has a simple structure and is easy to process and assemble.

[0026] In a second aspect, an electrical device is provided, comprising: the battery according to the first aspect or any possible implementation of the first aspect, wherein the battery is used to provide electrical energy.

[0027] In a third aspect, a method for preparing a battery is provided, comprising: providing a plurality of battery cells arranged along a first direction; providing a partition, wherein the partition extends along the first direction and is connected to a first wall of each of the plurality of battery cells, the first wall being the wall with the largest surface area in the battery cell, and an insulating layer is provided on a surface of the partition, wherein a dimension T1 of the partition in a second direction is less than 0.5 mm, and the second direction is perpendicular to the first wall.

[0028] In a fourth aspect, a device for preparing a battery is provided, comprising a module for executing the method of the third aspect.

[0029] In an embodiment of the present application, a partition is provided in the battery, connected to the first wall with the largest surface area of each battery cell in a row of multiple battery cells arranged along a first direction, and the size of the partition in a second direction perpendicular to the first wall is set to be less than 0.5 mm. Multiple battery cells are connected into a whole by a partition. In this case, side panels and beams are no longer required in the battery, which can greatly improve the space utilization inside the battery and thereby increase the energy density of the battery. By providing an insulating layer on the surface of the partition, electrical connection between the partition and the battery cells is avoided. Therefore, the technical solution of the embodiment of the present application can improve the energy density of the battery while ensuring electrical insulation in the battery, thereby improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0031] Figure 1 This is a schematic structural diagram of a vehicle disclosed in one embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the exploded structure of a battery disclosed in one embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the exploded structure of a battery cell disclosed in one embodiment of the present application;

[0034] Figure 4 This is a partial structural diagram of a battery disclosed in one embodiment of the present application;

[0035] Figure 5 This is a partial structural diagram of a battery disclosed in one embodiment of the present application;

[0036] Figure 6 is a schematic diagram of a battery cell disclosed in one embodiment of the present application;

[0037] Figure 7 This is a partial structural diagram of a battery disclosed in one embodiment of the present application;

[0038] Figure 8 This is a schematic structural diagram of a battery module disclosed in one embodiment of the present application;

[0039] Figure 9 This is a schematic structural diagram of a battery disclosed in one embodiment of the present application;

[0040] Figure 10 is a schematic flow chart of a method for preparing a battery according to an embodiment of the present application;

[0041] Figure 11 It is a schematic block diagram of an apparatus for preparing a battery according to an embodiment of the present application.

[0042] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0043] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0044] Throughout the description of this application, it should be noted that, unless otherwise specified, all technical and scientific terms used have the same meanings as commonly understood by one skilled in the art to which this application belongs. The terms used are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including," "having," and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions. "Multiple" means more than two. Terms such as "upper," "lower," "left," "right," "inner," and "outer" to indicate positions or relationships are intended solely for the purpose of describing this application and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but rather refers to positions within an acceptable range of error. "Parallel" does not mean parallel in the strict sense, but rather refers to positions within an acceptable range of error.

[0045] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0046] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0048] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0049] The battery referred to in the embodiments of this 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 this application may include a battery pack. A battery generally includes a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0050] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure that high currents can pass without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of polypropylene (PP) or polyethylene (PE). Furthermore, the electrode assembly can be a wound or laminated structure, but the embodiments of the present application are not limited thereto.

[0051] To meet different power requirements, a battery can include multiple battery cells, where the multiple battery cells can be connected in series, parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. Optionally, multiple battery cells can first be connected in series, parallel, or in a hybrid connection to form a battery module, and multiple battery modules can then be connected in series, parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells can be directly combined into a battery, or they can first be combined into battery modules, and then the battery modules can be combined into a battery. The battery is further installed in an electrical device to provide power to the device.

[0052] The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate, safety, etc. Among them, when the internal space of the battery is fixed, improving the utilization rate of the internal space of the battery is an effective means to improve the energy density of the battery. However, while improving the utilization rate of the internal space of the battery, the structural strength of the battery may be reduced. For example, beams for mounting battery modules are usually provided inside the battery casing. In addition, side plates and end plates are also provided for the battery modules in the battery. The above-mentioned beams, side plates and end plates not only fix the battery, but also occupy the internal space of the battery. However, if beams, side plates and end plates are not provided, the structural strength of the battery will be insufficient, affecting the performance of the battery.

[0053] In view of this, an embodiment of the present application provides a technical solution. In this embodiment of the present application, a partition is provided in the battery and connected to the first wall with the largest surface area of each battery cell in a row of multiple battery cells arranged along a first direction. The size of the partition in a second direction perpendicular to the first wall is set to be less than 0.5mm. Multiple battery cells are connected into a whole by a partition. In this case, side plates and beams and other structures are no longer required in the battery, which can greatly improve the space utilization rate inside the battery and thereby improve the energy density of the battery. By providing an insulating layer on the surface of the partition, electrical connection between the partition and the battery cell is avoided. Therefore, the technical solution of the embodiment of the present application can improve the energy density of the battery while ensuring electrical insulation in the battery, thereby improving the performance of the battery.

[0054] The technical solutions described in the embodiments of the present application are applicable to various battery-using devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0055] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0056] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 can be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 can be provided at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1. For example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery 10 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0057] In order to meet different power requirements, the battery 10 may include a plurality of battery cells. Figure 2FIG2 is a schematic diagram of the structure of a battery 10 according to an embodiment of the present application. The battery 10 may include a plurality of battery cells 20. The battery 10 may also include a housing 11. The housing 11 has a hollow interior and accommodates the plurality of battery cells 20. For example, the plurality of battery cells 20 may be connected in parallel, in series, or in a mixed combination and then placed in the housing 11.

[0058] Optionally, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the box through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0059] The number of battery cells 20 can be set to any value based on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or in a hybrid manner to achieve higher capacity or power. Since each battery 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. A battery can include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0060] like Figure 3 , is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application, wherein the battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212. The shell 211 and the cover plate 212 form an outer shell or battery box 21. The walls of the shell 211 and the cover plate 212 are both referred to as walls of the battery cell 20, wherein for a rectangular battery cell 20, the walls of the shell 211 include a bottom wall and four side walls. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined. For example, the shell 211 may be a hollow cuboid, a cube or a cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a cube, one of the planes of the shell 211 is an open surface, that is, the plane does not have a wall, so that the inside and outside of the shell 211 are connected. When the housing 211 is a hollow cylinder, the end surface of the housing 211 is an open surface, that is, the end surface has no wall, so that the inside and outside of the housing 211 are connected. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for accommodating the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0061] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is typically flat, with the two electrode terminals 214 secured to the flat surface of the cover plate 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member 23, also known as a current collecting member 23, which is located between the cover plate 212 and the electrode assembly 22 and electrically connects the electrode assembly 22 to the electrode terminals 214.

[0062] like Figure 3 As shown, each electrode assembly 22 has a first electrode tab 221a and a second electrode tab 222a. The polarity of the first electrode tab 221a and the second electrode tab 222a are opposite. For example, when the first electrode tab 221a is a positive electrode tab, the second electrode tab 222a is a negative electrode tab. The first electrode tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via a connecting member 23, and the second electrode tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab via one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via another connecting member 23.

[0063] In the battery cell 20, the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements. Figure 3 As shown, four independent electrode assemblies 22 are provided in the battery cell 20 .

[0064] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is used to be activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

[0065] The pressure relief mechanism 213 may be of various possible pressure relief structures, which are not limited in the present embodiment. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold; and / or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal pressure of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold.

[0066] Figure 4 FIG. 1 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application. Figure 4As shown in (a), the battery 10 includes a plurality of battery cells 20 and a partition 101 arranged along a first direction X. The partition 101 extends along the first direction X and is connected to 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 cell 20.

[0067] In this way, the first wall 201 with the largest surface area of each battery cell 20 in the multiple battery cells 20 is connected to the partition 101, and the multiple battery cells 20 are connected into a whole through the partition 101. In this case, side panels are no longer required in the battery 10, and beams and other structures are no longer required, which can greatly improve the space utilization inside the battery 10 and increase the energy density of the battery 10.

[0068] In the embodiments of this application, Figure 4 As shown in (b), the dimension T1 of the partition 101 in the second direction Y is less than 0.5 mm, and the second direction Y is perpendicular to the first wall 201.

[0069] In this way, the partition 101 can be prevented from being too large in the second direction Y and occupying too much space inside the battery 10 , thereby further improving the space utilization inside the battery 10 and thus improving the energy density of the battery 10 .

[0070] In the embodiments of this application, Figure 4 As shown in (c), an insulating layer 102 is provided on the surface of the separator 101 to prevent electrical connection between the separator 101 and the battery cell 20, thereby improving the safety of the battery 10. Optionally, the insulating layer 102 can be an insulating film bonded to the surface of the separator 101 or an insulating paint coated on the surface of the separator 101.

[0071] In the embodiment of the present application, a dimension T2 of the insulating layer 102 in the second direction Y satisfies: 0.01 mm ≤ T2 ≤ 0.3 mm.

[0072] When the dimension T2 of the insulating layer 102 in the second direction Y is too small, the insulating layer 102 cannot effectively prevent the electrical connection between the battery cell 20 and the partition 101, and the battery 10 will have poor insulation, posing a safety hazard. When the dimension T2 of the insulating layer 102 in the second direction Y is too large, it will occupy too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10. Therefore, the value of T2 is set to 0.01~0.3mm, which can not only improve the energy density of the battery 10, but also ensure the safety of the battery 10.

[0073] 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: 0.01×10-3 mm / V≤T2 / U≤3×10-3 mm / V.

[0074] The insulating effect of the insulating layer 102 is not only related to the thickness of the insulating layer 102, but also related to the thickness of the insulating layer 102 corresponding to the unit voltage. When T2 / U is too small, that is, the dimension T2 of the insulating layer 102 per unit voltage 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 partition 101, and the battery 10 will have poor insulation, posing a safety hazard. When T2 / U is too large, that is, the dimension T2 of the insulating layer 102 per unit voltage in the second direction Y is too large, it will occupy too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10. Therefore, the value of T2 / U is set to 0.01×10-3~3×10-3mm / V, which can not only improve the energy density of the battery 10, but also ensure the safety of the battery 10.

[0075] In the embodiment of the present application, the dimension T1 of the separator 101 in the second direction Y is not less than 0.05 mm. This can avoid the separator 101 being too small in the second direction, that is, the thickness of the separator 101 is too small, and the rigidity of the separator 101 is too small to meet the strength requirements of the battery 10.

[0076] In the embodiment of the present application, the area S1 of the surface of the separator 101 connected to the first wall 201 of the plurality of battery cells 20 and the total area S2 of the first wall 201 of the plurality of battery cells 20 connected to the same side of the separator 101 meet the following conditions: 0.25≤S1 / S2≤4, where S1=H1*L1, S2=H2*L2. Figure 5 As shown, 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 multiple battery cells 20 in the first direction X.

[0077] When the value of S1 / S2 is too small, that is, the area S1 of the surface of the partition 101 connected to the first walls 201 of the multiple battery cells 20 is much smaller than the total area S2 of the first walls 201 of the multiple battery cells 20 connected to the same side of the partition 101, the contact area between the first wall 201 and the partition 101 is too small to meet the strength requirements of the battery 10; when the value of S1 / S2 is too large, that is, the area S1 of the surface of the partition 101 connected to the first wall 201 is much larger than the total area S2 of the first walls 201 of the multiple battery cells 20 connected to the same side of the partition 101, compared with the battery cells 20, the partition 101 occupies too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10; therefore, the value of S1 / S2 is set to 0.25~4, which can not only improve the energy density of the battery 10, but also improve the strength of the battery 10.

[0078] In the embodiments of this application, Figure 5 As shown, 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: 0.2≤H1 / H2≤2. The third direction Z is perpendicular to the first direction X and the second direction Y.

[0079] When H1 / H2 is too small, that is, in the third direction Z, the size H1 of the partition 101 is much smaller than the size H2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition 101 is too small to meet the strength requirements of the battery 10; when H1 / H2 is too large, that is, in the third direction Z, the size H1 of the partition 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 101 occupies too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10. Therefore, setting the value of H1 / H2 to 0.2~2 can not only improve the energy density of the battery 10, but also improve the strength of the battery 10.

[0080] In the embodiments of this application, Figure 5 As shown, in the first direction X, the size L1 of the separator 101 and the size L2 of the plurality of battery cells 20 satisfy: 0.5≤L1 / L2≤2.

[0081] When L1 / L2 is too small, that is, in the first direction X, the size L1 of the partition 101 is much smaller than the size L2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition 101 is too small to meet the strength requirements of the battery 10; when L1 / L2 is too large, that is, in the first direction X, the size L1 of the partition 101 is much larger than the size L2 of the first wall 201 of the battery cell 20, compared with the battery cell 20, the partition 101 occupies too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10. Therefore, the value of L1 / L2 is set to 0.5~2, which can not only improve the energy density of the battery 10, but also improve the strength of the battery 10.

[0082] In the embodiments of this application, Figure 6 As shown, the battery cell 20 includes two first walls 201 oppositely arranged in the second direction Y and two second walls 202 oppositely arranged in the first direction X, wherein in the first direction X, the second walls 202 of two adjacent battery cells 20 are opposite to each other.

[0083] In the embodiments of this application, Figure 7 As shown, the battery 10 includes a plurality of columns of battery cells 20 and a plurality of separators 101 arranged along a first direction X, wherein the plurality of columns of battery cells 20 and the plurality of separators 101 are alternately arranged in a second direction Y.

[0084] In this way, the first walls 201 of each column of multiple battery cells 20 arranged along the first direction X can be connected to the partition 101 , and each column of multiple battery cells 20 arranged along the first direction X can be connected into a whole through the partition 101 , thereby effectively improving the strength of the battery 10 .

[0085] In the embodiment of the present application, the battery 10 includes a plurality of battery modules 100, such as Figure 8 As shown, the battery module 100 includes at least one column of battery cells 20 and at least one separator 101 arranged along a first direction X, and the at least one column of battery cells 20 and at least one separator 101 are alternately arranged in a second direction Y.

[0086] In the embodiment of the present application, the battery module 100 includes N columns of battery cells 20 and N-1 separators 101. The separators 101 are arranged between two adjacent columns of battery cells 20. N is an integer greater than 1. Figure 9 As shown, N is 2 as an example.

[0087] In the embodiments of this application, Figure 9 As shown, the plurality of battery modules 100 are arranged along the second direction Y, with gaps between adjacent battery modules 100 .

[0088] Optionally, a fixing structure 103 is provided at the end of the partition 101 in the first direction X. The fixing structure 103 is connected to a fixing piece 104 at the end of the partition 101 in the first direction X to fix the partition 101 .

[0089] In the embodiment of the present application, the partition 101 is bonded to the first wall 201. The partition 101 is fixedly connected to the first wall 201 by bonding, which has a simple structure and is easy to process and assemble.

[0090] It should be understood that the partition 101 and the first wall 201 can also be connected by other means, such as riveting, welding, etc., which is not limited in this application.

[0091] An embodiment of the present application further provides an electric device, which may include the battery 10 in the aforementioned embodiment. Optionally, the electric device may be a vehicle 1, a ship, or a spacecraft, but the embodiment of the present application is not limited thereto.

[0092] The battery 10 and the electrical device according to the embodiment of the present application are described above. The method and device for preparing the battery 10 according to the embodiment of the present application will be described below. For parts not described in detail, please refer to the aforementioned embodiments.

[0093] Figure 10 FIG. 3 is a schematic flow chart of a method 300 for preparing a battery 10 according to an embodiment of the present application. Figure 10 As shown, the method 300 may include:

[0094] 310 , providing a plurality of battery cells 20 arranged along a first direction X;

[0095] 320, providing a partition 101, which extends along a first direction X and is connected to a first wall 201 of each battery cell 20 in a plurality of battery cells 20, wherein the first wall 201 is the wall with the largest surface area in the battery cell 20, and an insulating layer 102 is provided on the surface of the partition 101, wherein a dimension T1 of the partition 101 in a second direction Y is less than 0.5 mm, and the second direction Y is perpendicular to the first wall 201.

[0096] Figure 11 FIG. 4 is a schematic block diagram of an apparatus 400 for preparing a battery 10 according to an embodiment of the present application. Figure 11 As shown, the apparatus 400 for preparing the battery 10 may include: providing a module 410 .

[0097] A module 410 is provided for providing a plurality of battery cells 20 and a separator 101 arranged along a first direction X, wherein the separator 101 extends along the first direction X and is connected to a first wall 201 of each battery cell 20 in the plurality of battery cells 20, wherein the first wall 201 is the wall with the largest surface area in the battery cell 20, and an insulating layer 102 is provided on the surface of the separator 101, wherein a dimension T1 of the separator 101 in a second direction Y is less than 0.5 mm, and the second direction Y is perpendicular to the first wall 201.

[0098] The following examples are provided for illustrative purposes only and are intended to explain the present invention and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in the art or in the product specifications shall prevail.

[0099] Using the battery cell 20 and separator 101 shown in the accompanying drawings, the separator vibration and impact resistance test was conducted in accordance with the GB 38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles." The test results are shown in Table 1. In Table 1, T1 is the separator dimension in the second direction Y, H1 is the separator dimension in the third direction Z, L1 is the separator dimension in the first direction X, H2 is the dimension of a single battery cell in the third direction Z, L2 is the sum of the dimensions of multiple battery cells in the first direction X, S1 = H1 * L1, and S2 = H2 * L2.

[0100] Table 1

[0101]

[0102]

[0103] Using the battery cell 20 and separator 101 shown in the accompanying drawings, the separator's insulation withstand voltage capability was tested in accordance with IEC 60664-1 under the following conditions: an insulation test with an applied voltage of 1000 VDC and an insulation resistance of 500 MΩ or greater; and a withstand voltage test with an applied voltage of 2700 VDC for 60 seconds and a leakage current of 1 mA or less. The test results are shown in Table 2. In Table 2, T2 represents the dimension of the insulation layer in the second direction Y, and U represents the battery voltage.

[0104] Table 2

[0105]

[0106]

[0107] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery, characterized in that: include: A plurality of battery cells (20) arranged along a first direction; a separator (101), the separator (101) extending along the first direction and connected to a first wall (201) of each battery cell (20) among the plurality of battery cells (20), the first wall (201) being a wall with the largest surface area among the battery cells (20), and an insulating layer (102) being provided on a surface of the separator (101); The dimension T1 of the partition (101) in the second direction is less than 0.5 mm, the second direction is perpendicular to the first wall (201), and the voltage U of the battery and the dimension T2 of the insulating layer (102) in the second direction satisfy the following relationship: 0.01×10-3 mm / V≤T2 / U≤3×10-3 mm / V.

2. The battery according to claim 1, characterized in that The dimension T1 of the partition (101) in the second direction is not less than 0.05 mm.

3. The battery according to claim 1 or 2, characterized in that 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≤S1 / S2≤4.

4. The battery according to claim 1 or 2, characterized in that In a third direction, a dimension H1 of the partition (101) and a dimension H2 of the first wall (201) of the battery cell (20) satisfy: 0.2≤H1 / H2≤2, and the third direction is perpendicular to the first direction and the second direction.

5. The battery according to claim 1 or 2, characterized in that In the first direction, the size L1 of the partition (101) and the size L2 of the plurality of battery cells (20) satisfy: 0.5≤L1 / L2≤2.

6. The battery according to claim 1 or 2, characterized in that A dimension T2 of the insulating layer (102) in the second direction satisfies: 0.01 mm≤T2≤0.3 mm.

7. The battery according to claim 1 or 2, characterized in that The battery cell (20) comprises two first walls (201) arranged opposite to each other in the second direction and two second walls (202) arranged opposite to each other in the first direction, wherein the second walls (202) of two adjacent battery cells (20) are opposite to each other in the first direction.

8. The battery according to claim 1 or 2, characterized in that The battery comprises a plurality of battery cells (20) and a plurality of separators (101) arranged in a plurality of columns along the first direction, wherein the plurality of columns of battery cells (20) and the plurality of separators (101) are alternately arranged in the second direction.

9. The battery according to claim 1 or 2, characterized in that The battery comprises a plurality of battery modules (100), wherein the battery modules (100) comprise at least one column of a plurality of battery cells (20) arranged along the first direction and at least one separator (101), and the at least one column of battery cells (20) and the at least one separator (101) are alternately arranged in the second direction.

10. The battery according to claim 9, characterized in that The battery module (100) comprises N columns of battery cells (20) and N-1 separators (101), wherein the separators (101) are arranged between two adjacent columns of battery cells (20), and N is an integer greater than 1.

11. The battery according to claim 9, characterized in that The plurality of battery modules (100) are arranged along the second direction, with gaps between adjacent battery modules (100).

12. The battery according to claim 1 or 2, characterized in that The partition (101) is bonded to the first wall (201).

13. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 12, wherein the battery is used to provide electrical energy.

14. A method for preparing a battery, characterized in that: include: Providing a plurality of battery cells (20) arranged along a first direction; Providing a separator (101), the separator (101) extending along the first direction and connected to a first wall (201) of each battery cell (20) among the plurality of battery cells (20), the first wall (201) being a wall with the largest surface area among the battery cells (20), and an insulating layer (102) being provided on a surface of the separator (101); The dimension T1 of the partition (101) in the second direction is less than 0.5 mm, the second direction is perpendicular to the first wall (201), and the voltage U of the battery and the dimension T2 of the insulating layer (102) in the second direction satisfy the following relationship: 0.01×10-3 mm / V≤T2 / U≤3×10-3 mm / V.

15. A device for preparing a battery, characterized in that: include: A module is provided for providing a plurality of battery cells (20) and a separator (101) arranged along a first direction, wherein the separator (101) extends along the first direction and is connected to a first wall (201) of each battery cell (20) in the plurality of battery cells (20), the first wall (201) being a wall with the largest surface area in the battery cell (20), and an insulating layer (102) is provided on a surface of the separator (101); The dimension T1 of the partition (101) in the second direction is less than 0.5 mm, the second direction is perpendicular to the first wall (201), and the voltage U of the battery and the dimension T2 of the insulating layer (102) in the second direction satisfy the following relationship: 0.01×10-3 mm / V≤T2 / U≤3×10-3 mm / V.

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