Battery, electrical device, method and equipment for preparing a battery

Abstract

An embodiment of the present application provides a battery, an electrical device, a method and a device for manufacturing the battery. The battery includes a plurality of battery cells arranged along a first direction; a separator, the separator 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 among the battery cells, wherein a dimension T1 of the separator in a second direction perpendicular to the first wall is greater than 5 mm. The technical solution of the embodiment of the present application can improve the performance of the battery.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery, an electrical device, a method and a device for manufacturing a battery. Background Art

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

[0003] The space utilization rate inside the battery affects the battery's power and energy density, and thus affects the battery's performance. How to improve the performance of the battery is an urgent technical problem in battery technology. Summary of the Invention

[0004] This application provides a battery, an electrical device, a method and a device for manufacturing a battery, which can improve the structural strength and energy density of the battery, thereby improving the performance of the battery.

[0005] In a first aspect, a battery is provided, including: a plurality of battery cells arranged along a first direction; a separator, the separator 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 among the battery cells, wherein a dimension T1 of the separator in a second direction perpendicular to the first wall is greater than 5 mm.

[0006] In the embodiments of this application, a separator is provided in the battery and connected to the first wall with the largest surface area of each of a row of a plurality of battery cells arranged along the first direction, and the dimension T1 of the separator in the second direction perpendicular to the first wall is greater than 5 mm. By connecting the plurality of battery cells into a whole through the separator, in this case, side plates may not be provided inside the battery, and structures such as beams may not be required either, which can greatly improve the space utilization rate inside the battery, improve the structural strength and energy density of the battery, and thus improve the performance of the battery.

[0007] In a possible implementation, a cavity is provided inside the separator.

[0008] In this way, the separator with a cavity structure has the ability to absorb deformation, can absorb the expansion deformation amount of the battery cells, and improve the performance of the battery.

[0009] In a possible implementation, the cavity is used to accommodate a fluid to adjust the temperature of the battery cells. This can conveniently adjust the temperature of the battery cells within a suitable range at any time, and improve the stability and safety of the battery cells.

[0010] In a possible implementation, the partition further includes a pair of sub-boards oppositely arranged along the second direction, and the cavity is arranged between the pair of sub-boards.

[0011] In a possible implementation, the size T3 of the sub-board in the second direction is 0.1 - 5 mm.

[0012] When the size T3 of the sub-board in the second direction is too small, with a certain internal space of the partition, the cavity occupies most of the space of the partition. In this case, the stiffness of the partition is very poor and it cannot effectively improve the structural strength of the battery. When the size T3 of the sub-board in the second direction is too large, the cavity inside the partition is very small and can hold very little fluid, and it cannot effectively regulate the temperature of the battery cell. Therefore, the value of T3 is set to 0.1 - 5 mm.

[0013] In a possible implementation, the partition further includes a reinforcing rib, and the reinforcing rib is arranged between the pair of sub-boards. By arranging the reinforcing rib, the stiffness of the partition can be enhanced.

[0014] In a possible implementation, the size T1 of the partition in the second direction and the size T2 of the battery cell in the second direction satisfy: 0.04 ≤ T1 / T2 ≤ 2.

[0015] When T1 / T2 is too small, that is, when the size T1 of the partition in the second direction is much smaller than the size T2 of the battery cell in the second direction, the deformation absorption ability of the partition is weak and it cannot match the expansion deformation amount of the battery cell, which will reduce the service performance of the battery cell. When T1 / T2 is too large, that is, when the size T1 of the partition in the second direction is much larger than the size T2 of the battery cell in the second direction, the deformation absorption ability of the partition is too strong and far exceeds the expansion deformation space required by 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 T1 / T2 is set to 0.04 - 2, so that both the energy density of the battery can be improved and the expansion deformation amount of the battery cell can be absorbed.

[0016] In a possible implementation, the size T1 of the partition in the second direction is not greater than 100 mm.

[0017] When the size T1 of the partition 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, setting the value of T1 not to be greater than 100 mm can effectively improve the energy density of the battery.

[0018] In a possible implementation, an insulating layer is provided on the outer surface of the partition, and the size T4 of the insulating layer in the second direction is 0.01 - 0.3 mm.

[0019] By providing an insulating layer on the outer surface of the separator, the electrical connection between the battery cell and the separator is avoided, improving the safety of the battery. When the size T4 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, resulting in poor insulation of the battery. When the size T4 of the insulating layer in the second direction is too large, it will excessively occupy the internal space of the battery, which is not conducive to improving the energy density of the battery. Therefore, the value of T4 is set to be 0.01 - 0.3 mm, which can not only improve the energy density of the battery but also ensure effective insulation between the battery cell and the separator.

[0020] In a possible implementation, the battery cell includes two first walls oppositely arranged in the second direction and two second walls oppositely arranged in the first direction, wherein, in the first direction, the second walls of two adjacent battery cells are opposite to each other.

[0021] In a possible implementation, the battery includes multiple battery cells arranged in multiple columns along the first direction and multiple separators, wherein the multiple columns of battery cells and the multiple separators are alternately arranged in the second direction.

[0022] In this way, the first walls of multiple battery cells arranged in each column along the first direction can all be connected to the separator, and multiple battery cells arranged in each column along the first direction can be connected into a whole through the separator, thereby effectively enhancing the strength of the battery.

[0023] In a possible implementation, the battery includes multiple battery modules, each battery module includes at least one column of multiple battery cells arranged along the first direction and at least one separator, and at least one column of battery cells and at least one separator are alternately arranged in the second direction. In this way, multiple columns of battery cells and multiple separators are connected to form a whole and are accommodated in the box body, which can not only effectively fix each column of battery cells but also ensure the overall energy density of the battery, thereby improving the performance of the battery.

[0024] In a possible implementation, the battery module includes N columns of battery cells and N - 1 separators, and the separators are arranged between two adjacent columns of battery cells, where N is an integer greater than 1. In this way, fewer separators can be provided in the battery, but at the same time, it can be ensured that each battery cell can be connected to the separator.

[0025] In a possible implementation, multiple battery modules are arranged along the second direction, and there is a gap between adjacent battery modules. This gap can provide expansion space for the battery cells.

[0026] In a possible implementation, the separator is bonded to the first wall.

[0027] The separator is fixedly connected to the first wall by bonding, which has a simple structure and is convenient for processing and assembly.

[0028] In a second aspect, an electrical device is provided, including: the battery in the first aspect or any possible implementation manner of the first aspect, and the battery is used to provide electrical energy.

[0029] In a third aspect, a method for preparing a battery is provided, including: providing a plurality of battery cells arranged along a first direction; providing a separator, the separator extends along the first direction and is connected to a first wall of each of the plurality of battery cells, and the first wall is the wall with the largest surface area in the battery cell. Wherein, the size T1 of the separator in a second direction perpendicular to the first wall is greater than 5 mm.

[0030] In a fourth aspect, a device for preparing a battery is provided, including a module for executing the method in the third aspect.

[0031] In the technical solution of the embodiments of the present application, a plurality of battery cells are arranged along a first direction, and the first wall with the largest surface area in each battery cell is connected to a separator extending along the first direction. The separator connects the plurality of battery cells into a whole. In this case, side plates may not be provided inside the battery, and structures such as beams may not be required either, which can greatly improve the space utilization rate inside the battery, enhance the structural strength and energy density of the battery, and thus improve the performance of the battery. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0033] Figure 1 It is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application;

[0034] Figure 2 It is an exploded structural diagram of a battery disclosed in an embodiment of the present application;

[0035] Figure 3 It is an exploded structural diagram of a battery cell disclosed in an embodiment of the present application;

[0036] Figure 4 It is a partial structural diagram of a battery disclosed in an embodiment of the present application;

[0037] Figure 5It is a partial cross-sectional view of a battery disclosed in an embodiment of the present application;

[0038] Figure 6 It is a schematic structural diagram of a separator disclosed in an embodiment of the present application;

[0039] Figure 7 It is a schematic structural diagram of a battery cell disclosed in an embodiment of the present application;

[0040] Figure 8 It is a schematic structural diagram of a battery disclosed in an embodiment of the present application;

[0041] Figure 9 It is a schematic structural diagram of a battery module disclosed in an embodiment of the present application;

[0042] Figure 10 It is a schematic structural diagram of a battery disclosed in an embodiment of the present application;

[0043] Figure 11 It is a schematic flow chart of a method for manufacturing a battery according to an embodiment of the present application;

[0044] Figure 12 It is a schematic block diagram of a device for manufacturing a battery according to an embodiment of the present application.

[0045] In the drawings, the drawings are not drawn to actual scale. Detailed Description of the Embodiment

[0046] The following further describes the embodiments of the present application in detail with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0047] In the description of the present application, it should be noted that unless otherwise specified, all technical and scientific terms used have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description, claims and drawings of the present application are intended to cover non-exclusive inclusion; the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicating the orientation or positional relationship are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. "Vertical" does not mean strictly vertical, but within the allowable error range. "Parallel" does not mean strictly parallel, but within the allowable error range.

[0048] The mention of "embodiment" in the present application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application may be combined with other embodiments.

[0049] The directional terms appearing in the following description are the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] The term "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0051] In this 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, etc., and the embodiments of this application do not limit this. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, and the embodiments of this application do not limit this either. Generally, the battery cells are divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this either.

[0052] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in this application may include a battery pack, etc. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0053] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the coated positive electrode active material layer protrudes from the current collector with the coated positive electrode active material layer. The current collector without the coated positive electrode active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the coated negative electrode active material layer protrudes from the current collector with the coated negative electrode active material layer. The current collector without the coated negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can pass through without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited to this.

[0054] In order to meet different power demands, the battery may include multiple battery cells. Among them, the multiple battery cells can be connected in series, in parallel, or in a series-parallel combination. The series-parallel combination means a combination of series and parallel. Optionally, the multiple battery cells can first be connected in series, in parallel, or in a series-parallel combination to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a series-parallel combination to form a battery. That is to say, the multiple battery cells can directly form a battery, or can first form a battery module, and then the battery module forms a battery. The battery is further arranged in an electrical device to provide electrical energy for the electrical device.

[0055] The development of battery technology needs to consider multiple design factors simultaneously. For example, energy density, cycle life, discharge capacity, charge-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 increase the energy density of the battery. However, while improving the utilization rate of the internal space of the battery, it may reduce the structural strength of the battery. For example, beams for mounting battery modules are usually provided inside the battery box, and side plates and end plates are also provided for the battery modules in the battery. While the above-mentioned beams, side plates and end plates achieve the fixation of the battery, they also occupy the internal space of the battery. However, if the beams, side plates and end plates are not provided, the structural strength of the battery will be insufficient, affecting the performance of the battery.

[0056] In view of this, the embodiments of the present application provide a technical solution. In the embodiments 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 the first direction. The size T1 of the partition in the second direction perpendicular to the first wall is greater than 5 mm. By connecting multiple battery cells into a whole through the partition, in this case, side plates may not be required inside the battery, and structures such as beams may not be needed either, which can greatly improve the utilization rate of the internal space of the battery, enhance the structural strength and energy density of the battery, and thus improve the performance of the battery.

[0057] The technical solutions described in the embodiments of the present application are applicable to various devices using batteries. For example, mobile phones, portable devices, laptops, battery cars, electric toys, power tools, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.

[0058] 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 applicable to all devices using batteries. However, for the sake of brevity of description, the following embodiments will be described taking electric vehicles as an example.

[0059] For example, as Figure 1As shown in the figure, it is a schematic structural 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 arranged inside the vehicle 1. The controller 30 is used to control the power supply of the battery 10 to the motor 40. For example, the battery 10 can be arranged at the bottom, the front end or the rear end of the vehicle 1. The battery 10 can be used for the power supply of the vehicle 1. For example, the battery 10 can be used as the operating power source of the vehicle 1 and is used for the circuit system of the vehicle 1, such as the working power requirements for starting, navigation and running of the vehicle 1. In another embodiment of the present application, the battery 10 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0060] To meet different power usage requirements, the battery 10 can include a plurality of battery cells. For example, as Figure 2 shown in the figure, it is a schematic structural diagram of a battery 10 according to an embodiment of the present application. The battery 10 can include a plurality of battery cells 20. The battery 10 can further include a box body 11. The inside of the box body 11 is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11. For example, a plurality of battery cells 20 are placed in the box body 11 after being connected in parallel, in series or in a hybrid connection.

[0061] Optionally, the battery 10 can further include other structures, which will not be elaborated one by one here. For example, the battery 10 can further include a busbar component, which is used to realize the electrical connection between a plurality of battery cells 20, such as parallel connection, series connection or hybrid connection. Specifically, the busbar component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of a plurality of battery cells 20 can be further led out through a conductive mechanism passing through the box body. Optionally, the conductive mechanism can also belong to the busbar component.

[0062] According to different power requirements, the number of battery cells 20 can be set to any value. A plurality of battery cells 20 can be connected in series, in parallel or in a hybrid connection to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be relatively large, for the convenience of installation, the battery cells 20 can be grouped, and each group of battery cells 20 forms a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements. The battery can include a plurality of battery modules, and these battery modules can be connected in series, in parallel or in a hybrid connection.

[0063] As Figure 3As shown, a schematic structural diagram of a battery cell 20 according to an embodiment of the present application is provided. The battery cell 20 includes one or more electrode assemblies 22, a housing 211, and a cover plate 212. The housing 211 and the cover plate 212 form an outer shell or a battery case 21. The walls of the housing 211 and the cover plate 212 are both referred to as the walls of the battery cell 20. For a cuboid-shaped battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The housing 211 is determined according to the shape after combining one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one of the surfaces of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow cuboid or cube, one of the planes of the housing 211 is an open surface, that is, this plane does not have a wall body, making the inside and outside of the housing 211 communicate. When the housing 211 can be a hollow cylinder, the end face of the housing 211 is an open surface, that is, this end face does not have a wall body, making the inside and outside of the housing 211 communicate. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0064] The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 can be arranged on the cover plate 212. The cover plate 212 is usually in a flat plate shape, and the two electrode terminals 214 are fixed on the flat plate surface of the cover plate 212. The two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b respectively. Each electrode terminal 214 is correspondingly provided with a connection member 23, or can also be called a current collector member 23, which is located between the cover plate 212 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0065] As Figure 3 shown, each electrode assembly 22 has a first tab 221a and a second tab 222a. The polarities of the first tab 221a and the second tab 222a are opposite. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tabs 221a of one or more electrode assemblies 22 are connected to one electrode terminal through a connection member 23, and the second tabs 222a of one or more electrode assemblies 22 are connected to the other electrode terminal through another connection member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab through a connection member 23, and the negative electrode terminal 214b is connected to the negative electrode tab through another connection member 23.

[0066] In this battery cell 20, according to actual usage requirements, the electrode assembly 22 can be set to be single or multiple. As Figure 3 shown, there are 4 independent electrode assemblies 22 arranged inside the battery cell 20.

[0067] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0068] The pressure relief mechanism 213 can be various possible pressure relief structures, and the embodiments of the present application do not limit this. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0069] Figure 4 The structural schematic diagram of the battery 10 according to an embodiment of the present application is shown. As Figure 4 shown, the battery 10 includes a plurality of battery cells 20 arranged along the first direction X and a separator 101. The separator 101 extends along the first direction X and is connected to the first wall 201 of each battery cell 20 among the plurality of battery cells 20. The first wall 201 is the wall with the largest surface area in the battery cell 20.

[0070] In this way, the first wall 201 with the largest surface area of each battery cell 20 among the plurality of battery cells 20 is connected to the separator 101, and the plurality of battery cells 20 are connected into a whole through the separator 101. In this case, side plates may not need to be provided inside the battery 10, and structures such as beams may not be required either, which can greatly improve the space utilization rate inside the battery 10 and enhance the structural strength and energy density of the battery 10.

[0071] In the embodiments of the present application, as Figure 5 shown, the size T1 of the separator 101 in the second direction Y is greater than 5 mm, and the second direction Y is perpendicular to the first wall 201.

[0072] In the embodiments of the present application, the size T1 of the separator 101 in the second direction Y is not greater than 100 mm.

[0073] When the size T1 of the separator 101 in the second direction 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, setting the value of T1 not greater than 100 mm can effectively improve the energy density of the battery 10.

[0074] In the embodiments of the present application, as Figure 5 shown, a cavity 102 is provided inside the separator 101.

[0075] In this way, the partition plate 101 with a cavity structure has the ability to absorb deformation, which can absorb the expansion deformation amount of the battery cell 20 and improve the performance of the battery 10.

[0076] Optionally, the cavity 102 can be used to accommodate a fluid to adjust the temperature of the battery cell 20.

[0077] It should be understood that the fluid mentioned here can be a liquid that can adjust the temperature and does not chemically react with the material of the cavity 102, such as water, and the present application does not limit this.

[0078] In this way, the temperature of the battery cell 20 can be conveniently adjusted within a suitable range at any time, improving the stability and safety of the battery cell 20.

[0079] In the embodiment of the present application, the partition plate 101 further includes a pair of sub-plates 103 oppositely arranged along the second direction Y, and the cavity 102 is arranged between the pair of sub-plates 103.

[0080] In the embodiment of the present application, as Figure 5 shown, the size T3 of the sub-plate 103 in the second direction Y is 0.1 - 5 mm.

[0081] When the size T3 of the sub-plate 103 in the second direction is too small, with a certain internal space of the partition plate 101, the cavity 102 occupies most of the space of the partition plate 101. In this case, the stiffness of the partition plate 101 is very poor and cannot effectively improve the structural strength of the battery 10. When the size T3 of the sub-plate 103 in the second direction is too large, the cavity 102 inside the partition plate 101 is very small and can accommodate very little fluid, and cannot effectively adjust the temperature of the battery cell 20. Therefore, the value of T3 is set to 0.1 - 5 mm.

[0082] Optionally, the sizes T3 of the pair of sub-plates 103 of the partition plate in the second direction can be the same or different.

[0083] In the embodiment of the present application, the partition plate 101 further includes a reinforcing rib 105, and the reinforcing rib 105 is arranged between the pair of sub-plates 103.

[0084] Optionally, as Figure 6 shown in (a), the reinforcing rib 105 can be arranged only on one sub-plate 103. As Figure 6 shown in (b), the reinforcing rib 105 can also be arranged between the pair of sub-plates 103 and connected to the pair of sub-plates 103.

[0085] Optionally, as Figure 6 shown in (b) and (c), the included angle between the reinforcing rib 105 and the sub-plate 103 can be an acute angle. As Figure 6 shown in (a), the included angle between the reinforcing rib 105 and the sub-plate 103 can also be a right angle.

[0086] In the embodiment of the present application, the dimension T1 of the partition 101 in the second direction Y and the dimension T2 of the battery cell 20 in the second direction Y satisfy: 0.04 ≤ T1 / T2 ≤ 2.

[0087] When T1 / T2 is too small, that is, the dimension T1 of the partition 101 in the second direction is much smaller than the dimension T2 of the battery cell 20 in the second direction, the deformation absorption ability of the partition 101 is weak and cannot match the expansion deformation amount of the battery cell 20, which will reduce the service performance of the battery cell 20. When T1 / T2 is too large, that is, the dimension T1 of the partition 101 in the second direction is much larger than the dimension T2 of the battery cell 20 in the second direction, the deformation absorption ability of the partition 101 is too strong, far exceeding the expansion deformation space required by 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 T1 / T2 is set to 0.04 - 2, which can not only improve the energy density of the battery 10, but also absorb the expansion deformation amount of the battery cell 20.

[0088] In the embodiment of the present application, an insulating layer 104 is provided on the outer surface of the partition 101, and the dimension T4 of the insulating layer 104 in the second direction Y is 0.01 - 0.3 mm. Optionally, the insulating layer 104 can be an insulating film adhered to the surface of the partition 101 or an insulating paint coated on the surface of the partition 101.

[0089] By providing the insulating layer 104 on the outer surface of the partition 101, the electrical connection between the battery cell 20 and the partition 101 is avoided, and the safety of the battery 10 is improved. When the dimension T4 of the insulating layer 104 in the second direction is too small, the insulating layer 104 cannot effectively avoid the electrical connection between the battery cell 20 and the partition 101, and the battery 10 will have a poor insulation situation. When the dimension T4 of the insulating layer 104 in the second direction 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 T4 is set to 0.01 - 0.3 mm, which can not only improve the energy density of the battery 10, but also ensure effective insulation between the battery cell 20 and the partition 101.

[0090] In the embodiment of the present application, as Figure 7 shown, the battery cell 20 includes two first walls 201 oppositely arranged in the second direction Y and two second walls oppositely arranged in the first direction X, wherein, in the first direction X, the second walls of two adjacent battery cells 20 are opposite to each other.

[0091] In the embodiment of the present application, as Figure 8As shown, the battery 10 includes multiple battery cells 20 arranged in multiple columns along the first direction X and multiple separators 101, wherein the multiple columns of battery cells 20 and the multiple separators 101 are alternately arranged in the second direction Y.

[0092] In this way, the first wall 201 of each column of multiple battery cells 20 arranged along the first direction X can be connected to the separator 101, and each column of multiple battery cells 20 arranged along the first direction X can be connected into a whole through the separator 101, thereby effectively improving the strength of the battery 10.

[0093] In an embodiment of the present application, the battery 10 includes multiple battery modules 100, as Figure 9 shown, the battery module 100 includes at least one column of multiple battery cells 20 arranged along the first direction X and at least one separator 101, and at least one column of battery cells 20 and at least one separator 101 are alternately arranged in the second direction Y.

[0094] In an embodiment of the present application, the battery module 100 includes N columns of battery cells 20 and N - 1 separators 101, and the separator 101 is arranged between two adjacent columns of battery cells 20, and N is an integer greater than 1. As Figure 11 shown, taking N as 2 as an example for illustration.

[0095] In an embodiment of the present application, as Figure 10 shown, multiple battery modules 100 are arranged along the second direction Y, and there is a gap between adjacent battery modules 100.

[0096] Optionally, a current collector 106 is provided at the end of the separator 101 in the first direction X, and a pipeline 107 is provided inside the battery 10. The pipeline 107 is used to transport fluid, and the current collector 106 is used to collect the fluid.

[0097] In an embodiment of the present application, the separator 101 is bonded to the first wall 201. By bonding, the separator 101 is fixedly connected to the first wall 201, and the structure is simple, which is convenient for processing and assembly.

[0098] It should be understood that the separator 101 and the first wall 201 can also be connected by other means, for example, riveting, welding, etc., and the present application does not limit this.

[0099] An embodiment of the present application further provides an electrical device, and the electrical device may include the battery 10 in the foregoing embodiment. Optionally, the electrical device may be a vehicle 1, a ship, a spacecraft, etc., but the embodiments of the present application do not limit this.

[0100] The battery 10 and the electrical device in the embodiments of the present application are described above. Next, the method and device for manufacturing the battery 10 in the embodiments of the present application will be described, and the parts not described in detail can be referred to the foregoing embodiments.

[0101] Figure 11 Figure 300 is a schematic flow chart showing a method 300 for preparing a battery 10 according to an embodiment of the present application. As Figure 11 shown, the method 300 may include:

[0102] 310, providing a plurality of battery cells 20 arranged along a first direction X;

[0103] 320, providing a separator 101 that extends along the first direction X and is connected to a first wall 201 of each of the plurality of battery cells 20, where the first wall 201 is the wall with the largest surface area among the battery cells 20. Among them, the size T1 of the separator 101 in a second direction Y perpendicular to the first wall 201 is greater than 5 mm.

[0104] Figure 12 Figure 400 is a schematic block diagram showing a device 400 for preparing a battery 10 according to an embodiment of the present application. As Figure 12 shown, the device 400 for preparing the battery 10 may include: a providing module 410.

[0105] The providing module 410 is configured to provide a plurality of battery cells 20 and a separator 101 arranged along the first direction X. The separator 101 extends along the first direction X and is connected to a first wall 201 of each of the plurality of battery cells 20, where the first wall 201 is the wall with the largest surface area among the battery cells 20. Among them, the size T1 of the separator 101 in a second direction Y perpendicular to the first wall 201 is greater than 5 mm.

[0106] Hereinafter, embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application. For those not specified in the embodiments, the techniques or conditions described in the literature in the art or according to the product specifications are followed.

[0107] Using the battery cells 20 and the separator 101 shown in the drawings, 1C / 1C charge and discharge cycles are performed at 60 °C until the capacity decays to 80% SOC, and a cyclic durability acceleration experiment is carried out. The test results are shown in Table 1. In Table 1, T1 is the size of the separator in the second direction X, and T2 is the size of the battery cell in the second direction X.

[0108] Table 1

[0109]

[0110]

[0111] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that, Comprising: A plurality of battery cells (20) arranged in a first direction; A box body, in which the plurality of battery cells (20) are accommodated; A partition plate (101), the partition plate (101) extends along the first direction and is connected to a first wall (201) of each battery cell (20) among the plurality of battery cells (20), and the first wall (201) is the wall with the largest surface area in the battery cell (20); Wherein, a dimension T1 of the partition plate (101) in a second direction is greater than 5 mm, the second direction is perpendicular to the first wall (201), and a cavity (102) is arranged inside the partition plate (101), and the cavity (102) is used for accommodating a fluid to adjust the temperature of the battery cell (20).

2. The battery according to claim 1, wherein, The partition plate (101) further includes a pair of sub-plates (103) oppositely arranged in the second direction, and the cavity (102) is arranged between the pair of sub-plates (103).

3. The battery according to claim 2, characterized in that, A dimension T3 of the sub-plate (103) in the second direction is 0.1 - 5 mm.

4. The battery according to claim 2, characterized in that, The partition plate (101) further includes a reinforcing rib (105), and the reinforcing rib (105) is arranged between the pair of sub-plates (103).

5. The battery according to any one of claims 1 to 4, characterized in that, A dimension T1 of the partition plate (101) in the second direction and a dimension T2 of the battery cell (20) in the second direction satisfy: 0.04 ≤ T1 / T2 ≤ 2.

6. The battery according to any one of claims 1 to 4, characterized in that, The dimension T1 of the partition plate (101) in the second direction is not greater than 100 mm.

7. The battery according to any one of claims 1 to 4, characterized in that, An insulating layer (104) is arranged on an outer surface of the partition plate (101), and a dimension T4 of the insulating layer (104) in the second direction is 0.01 - 0.3 mm.

8. The battery according to any one of claims 1 to 4, characterized in that, The battery cell (20) includes two of the first walls (201) oppositely arranged in the second direction and two second walls oppositely arranged in the first direction, wherein, in the first direction, the second walls of two adjacent battery cells (20) are opposite to each other.

9. The battery according to any one of claims 1 to 4, characterized in that, The battery includes multiple columns of a plurality of the battery cells (20) arranged in the first direction and a plurality of the partition plates (101), wherein, in the second direction, the multiple columns of battery cells (20) and the plurality of partition plates (101) are alternately arranged.

10. The battery according to any one of claims 1 to 4, characterized in that, The battery includes a plurality of battery modules (100), the battery module (100) includes at least one column of a plurality of the battery cells (20) arranged in the first direction and at least one of the partition plates (101), and at least one column of battery cells (20) and at least one partition plate (101) are alternately arranged in the second direction.

11. The battery according to claim 10, characterized in that, The battery module (100) includes N columns of the battery cells (20) and N - 1 of the partition plates (101), the partition plate (101) is arranged between two adjacent columns of the battery cells (20), and N is an integer greater than 1.

12. The battery according to claim 10, characterized in that, A plurality of the battery modules (100) are arranged in the second direction, and there is a gap between adjacent battery modules (100).

13. The battery according to any one of claims 1 to 4, characterized in that, The partition plate (101) is bonded to the first wall (201).

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

15. A method for preparing a battery, characterized in that, Comprising: Providing a plurality of battery cells (20) arranged in a first direction; Providing a separator (101), the separator (101) extending in 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 the wall with the largest surface area in the battery cell (20); Wherein, a dimension T1 of the separator (101) in a second direction is greater than 5 mm, the second direction is perpendicular to the first wall (201), and a cavity (102) is provided inside the separator (101), and the cavity (102) is used to accommodate a fluid to adjust the temperature of the battery cell (20).

16. An apparatus for preparing a battery, characterized in that, Comprising: Providing a module for providing a plurality of battery cells (20) and a separator (101) arranged in a first direction, the separator (101) extending in 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 the wall with the largest surface area in the battery cell (20); Wherein, a dimension T1 of the separator (101) in a second direction is greater than 5 mm, the second direction is perpendicular to the first wall (201), and a cavity (102) is provided inside the separator (101), and the cavity (102) is used to accommodate a fluid to adjust the temperature of the battery cell (20).

Images