Battery and electrical equipment

Abstract

An embodiment of the present application provides a battery and an electrical device. The battery includes: a box body (11); a plurality of battery cell columns accommodated in the box body (11), the battery cell columns including a plurality of battery cells (20) arranged along a first direction, the plurality of battery cell columns being arranged along a second direction perpendicular to the first direction, the battery cell (20) including a first wall (201), and an electrode terminal (214) being provided on the first wall (201); a connection bar (101), the connection bar (101) extending along the second direction and being connected to the first walls (201) of the plurality of battery cells (20) in the plurality of battery cell columns arranged along the second direction. The technical solution of the embodiment of the present application can improve the structural strength and energy density of the battery, thereby improving the performance of the battery.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery and an electrical device. 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 structural strength and energy density of the battery, and thus affects the performance of the battery. How to improve the performance of the battery is an urgent technical problem in battery technology. Summary of the Invention

[0004] The present application provides a battery and an electrical device, which can improve the structural strength and energy density of the battery, and thus can improve the performance of the battery.

[0005] In a first aspect, a battery is provided, including: a box body; a plurality of battery cell columns accommodated in the box body, the battery cell columns including a plurality of the battery cells arranged along a first direction, the plurality of battery cell columns arranged along a second direction, the second direction being perpendicular to the first direction, the battery cell including a first wall, the first wall being provided with an electrode terminal; a connecting bar, the connecting bar extending along the second direction and connecting to the first walls of a plurality of the battery cells in the plurality of battery cell columns arranged along the second direction.

[0006] In an embodiment of the present application, the connecting bar is connected to the first walls provided with electrode terminals of a plurality of battery cells in the plurality of battery cell columns arranged along the second direction, and the plurality of battery cells are connected into a whole through the connecting bar. 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, and improve the structural strength and energy density of the battery. Therefore, the technical solution of the embodiment of the present application can improve the performance of the battery.

[0007] In a possible implementation manner, the connecting bar includes a middle connecting bar, and the middle connecting bar is connected to the first walls of two adjacent battery cells in the battery cell column.

[0008] The middle connecting bar connects the first walls of two adjacent battery cells in the battery cell column, thereby connecting the two adjacent battery cells in the battery cell column and improving the structural strength of the battery cell column.

[0009] In a possible implementation manner, the connecting bar includes an end connecting bar, and the end connecting bar is connected to the first wall of the battery cell at the end in the first direction in the battery cell column.

[0010] The end connecting bar is connected to the first wall of the battery cell at the end in the first direction in the battery cell group, so as to improve the structural strength of the battery cell at the end in the first direction in the battery cell group and improve the structural strength of the battery.

[0011] In a possible implementation manner, the middle connecting bar is arranged between the adjacent two electrode terminals of the adjacent two battery cells.

[0012] The middle connecting bar is connected to the first walls of the adjacent two battery cells, and electrode terminals are arranged on the first walls. Therefore, the connecting bar is arranged between the adjacent two electrode terminals of the adjacent two battery cells to avoid the connecting bar covering the electrode terminals when connecting the adjacent two battery cells and avoid affecting the electrical connection of the battery.

[0013] In a possible implementation manner, the connecting bar is a metal material plate. This can ensure the strength of the connecting bar.

[0014] In a possible implementation manner, an insulating layer is arranged on the surface of the connecting bar. By arranging the insulating layer on the surface of the connecting bar, the surface of the connecting bar connected to the first wall can be an insulating surface.

[0015] In a possible implementation manner, the connecting bar is a non-metal material plate.

[0016] In a possible implementation manner, a cavity is arranged inside the connecting bar. The first cavity can reduce the weight of the connecting bar while ensuring the strength of the connecting bar.

[0017] In a possible implementation manner, the cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell, so that the temperature of the battery cell can be effectively managed.

[0018] In a possible implementation manner, the dimension T of the connecting bar in the third direction is 0.5 - 30 mm, and the third direction is perpendicular to the first direction and the second direction.

[0019] When the dimension T of the connecting bar in the third direction is too small, the stiffness of the connecting bar is poor and it cannot effectively improve the structural strength of the battery. When the dimension T of the connecting bar in the third 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 dimension T of the connecting bar in the third direction is set to 0.5 - 30 mm, so that both the energy density of the battery can be guaranteed and the structural strength of the battery can be improved.

[0020] In a possible implementation, the dimension T of the connecting bar in the third direction and the weight M of the battery cell satisfy: 0.05 mm / kg < T / M ≤ 50 mm / kg, and the third direction is perpendicular to the first direction and the second direction.

[0021] When T / M is too large, the battery will lose weight energy density. Therefore, the dimension T of the connecting bar in the third direction and the weight M of the battery cell are set to satisfy 0.05 mm / kg < T / M ≤ 50 mm / kg to ensure the weight energy density of the battery.

[0022] In a possible implementation, 0.05 mm / kg < T / M ≤ 30 mm / kg to further improve the weight energy density of the battery.

[0023] In a possible implementation, the battery cell includes a second wall, and the second wall is the wall with the largest surface area in the battery cell, and the second direction is perpendicular to the second wall.

[0024] The second wall with the largest surface area in the battery cell is perpendicular to the arrangement direction of multiple columns of battery cells and parallel to the arrangement direction of multiple battery cells in each column of battery cells. That is, when multiple battery cells in each column of battery cells are arranged, the relatively smaller surfaces of adjacent two battery cells are arranged opposite to each other. When multiple columns of battery cells are arranged, the second walls with the largest surface area of adjacent two columns of battery cells are arranged opposite to each other. This arrangement is convenient for the assembly layout of multiple columns of battery cells and other components in the battery.

[0025] In a possible implementation, the end of the connecting bar in the second direction is fixed to the box body to fix the connecting bar.

[0026] In a possible implementation, the connecting bar includes a first surface and a second surface that are oppositely arranged in the third direction. The first surface is connected to the first wall, and the second surface is connected to the box body of the battery. The third direction is perpendicular to the first direction and the second direction.

[0027] The first surface of the connecting bar is connected to the first wall, and the second surface of the connecting bar is connected to the box body, so that the battery cell is connected to the box body through the connecting bar, which can fix the battery cell and improve the structural strength of the battery.

[0028] In a possible implementation, the box body includes a fixed wall, and the fixed wall is connected to the third wall of each battery cell in multiple columns of battery cells. The third wall is separated from and opposite to the first wall in the third direction, and the third direction is perpendicular to the first direction and the second direction.

[0029] The fixed wall is connected to the third wall of the battery cell to fix the battery cell and improve the structural strength of the battery.

[0030] In a possible implementation, when the battery is disposed in the electrical device, the connecting bar is located below the battery cell, and the fixing wall is used to mount the battery cell.

[0031] The connecting bar is located below the battery cell, that is, the electrode terminals of the battery cell face downward. In the third direction, the first wall of the battery cell is below the third wall, and the fixing wall is connected to the third wall to mount the battery cell. In this case, the wall towards which the electrode terminals face is not the stress-bearing wall, and there is no need to leave a large gap between the electrode terminals, so as to save the battery space and improve the energy density of the battery.

[0032] In a possible implementation, when the battery is disposed in the electrical device, the connecting bar is located above the battery cell, and the fixing wall is used to support the battery cell.

[0033] The connecting bar is located above the battery cell, that is, the electrode terminals of the battery cell face upward. In the third direction, the first wall of the battery cell is above the third wall, and the fixing wall is connected to the third wall to support the battery cell and improve the structural strength of the battery.

[0034] In a possible implementation, the connecting bar is bonded to the first wall. The connecting bar is fixedly connected to the first wall by bonding, and the structure is simple, which is convenient for processing and assembly.

[0035] In a second aspect, an electrical device is provided, including: the battery in the first aspect or any possible implementation of the first aspect, and the battery is used to provide electrical energy.

[0036] In the technical solution of the present application, the connecting bar is connected to the first wall provided with electrode terminals of a plurality of battery cells arranged along the second direction, and the plurality of battery cells are connected into a whole through the connecting bar. In this case, side plates may not be provided in the battery, and structures such as beams may not be required either, which can greatly improve the space utilization rate inside the battery, and improve the structural strength and energy density of the battery. Therefore, the technical solution of the embodiments of the present application can improve the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 drawings described below 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.

[0038] Figure 1 It is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application;

[0039] Figure 2 It is a schematic structural diagram of a battery disclosed in an embodiment of the present application;

[0040] Figure 3 It is an exploded structural diagram of a battery cell disclosed in an embodiment of the present application;

[0041] Figure 4 It is a schematic structural diagram of a battery disclosed in an embodiment of the present application;

[0042] Figure 5 It is a schematic structural diagram of a connection bar disclosed in an embodiment of the present application;

[0043] Figure 6 It is a partial cross-sectional view of a battery disclosed in an embodiment of the present application;

[0044] Figure 7 It is a partial cross-sectional view of a battery disclosed in an embodiment of the present application;

[0045] Figure 8 It is a partial cross-sectional view of a battery disclosed in an embodiment of the present application.

[0046] In the drawings, the drawings are not drawn to actual scale. Detailed implementation manners

[0047] The following further describes in detail the implementation manners of the present application in conjunction with the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principle 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.

[0048] 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 specification and claims of the present application and the above drawings 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. indicate the orientation or positional relationship 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 therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0049] Reference to "embodiment" in this application means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this 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. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application may be combined with other embodiments.

[0050] The orientation terms appearing in the following description are all the 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 "mounted", "connected", and "coupled" 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 internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0052] 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 cell is divided into three types according to the encapsulation method: a cylindrical battery cell, a square battery cell, and a soft-pack battery cell, and the embodiments of this application do not limit this either.

[0053] The battery mentioned in the embodiments of this application refers to a single physical module including 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. Generally, the battery 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 cell.

[0054] The 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. The battery cell mainly operates 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. To ensure that large currents can pass through without fusing, the number of positive electrode tabs is multiple and they are stacked together, and the number of negative electrode tabs is multiple and they are 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 laminated structure, and the embodiments of the present application are not limited thereto.

[0055] To meet different power demands, the battery can 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 connections. 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 they 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.

[0056] 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 improve 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 arranged inside the battery box, and in addition, side plates and end plates are also arranged on the battery modules in the battery. The above-mentioned beams, side plates, and end plates not only realize the fixation of the battery but also occupy the internal space of the battery. However, if the beams, side plates, and end plates are not arranged, it will lead to insufficient structural strength of the battery, affecting the performance of the battery.

[0057] In view of this, the embodiments of the present application provide a technical solution. In the embodiments of the present application, a connection bar is connected to the first wall provided with electrode terminals of a plurality of battery cells in a plurality of battery cell columns arranged along the second direction. The plurality of battery cells are connected into an integral body through the connection bar. In this case, side plates may no longer 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, and improve the structural strength and energy density of the battery. Therefore, the technical solution of the embodiments of the present application can improve the performance of the battery.

[0058] The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, electric vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0059] 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 concise description, the following embodiments will be described by taking electric vehicles as an example.

[0060] For example, as Figure 1 shown, 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 provided 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 provided 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, for the circuit system of the vehicle 1, such as for the working power requirements during the start-up, navigation, and operation 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.

[0061] In order to meet different power usage requirements, the battery 10 can include a plurality of battery cells. For example, as Figure 2 shown, 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 also 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 mixed connection combination.

[0062] Optionally, the battery 10 may further include other structures, which will not be elaborated here one by one. For example, the battery 10 may further include a busbar component, which is used to achieve electrical connection between multiple battery cells 20, such as parallel connection, series connection or hybrid connection. Specifically, the busbar component can achieve electrical connection between battery cells 20 by connecting the electrode terminals of battery cells 20. Further, the busbar component can be fixed to the electrode terminals of battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through a conductive mechanism passing through the box body. Optionally, the conductive mechanism may also belong to the busbar component.

[0063] According to different power requirements, the number of battery cells 20 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be 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 may include multiple battery modules, and these battery modules can be connected in series, parallel or in a hybrid manner.

[0064] As Figure 3 shown, it is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. 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 wall of the housing 211 and the cover plate 212 are both referred to as the wall of the battery cell 20. For a cuboid-shaped battery cell 20, the wall of the housing 211 includes a bottom wall and four side walls. The housing 211 is determined according to the shape after one or more electrode assemblies 22 are combined. 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 opening surface, that is, this plane does not have a wall body and makes 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 opening surface, that is, this end face does not have a wall body and makes 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.

[0065] The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be disposed on the cover plate 212. The cover plate 212 is generally 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 connecting member 23, or may also be referred to as a current collecting 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.

[0066] As Figure 3 shown, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tabs 221a of one or more electrode assemblies 22 are connected to one electrode terminal through a connecting member 23, and the second tabs 222a of one or more electrode assemblies 22 are connected to the other electrode terminal through another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab through a connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab through another connecting member 23.

[0067] In the battery cell 20, according to actual usage requirements, the electrode assembly 22 can be set to be single or multiple. As Figure 3 shown, 4 independent electrode assemblies 22 are provided in the battery cell 20.

[0068] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is used to actuate to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0069] 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, and the temperature-sensitive pressure relief mechanism is configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, and the pressure-sensitive pressure relief mechanism is configured to be able to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0070] Figure 4 shows a schematic structural diagram of the battery 10 according to an embodiment of the present application. As Figure 4 shown, the battery 10 includes a box body 11, a plurality of battery cell columns and connection bars 101, and the plurality of battery cell columns are accommodated in the box body 11.

[0071] The battery cell columns include a plurality of battery cells 20 arranged along a first direction x, and the plurality of battery cell columns are arranged along a second direction y, where the second direction y is perpendicular to the first direction x.

[0072] The first direction x is the arrangement direction of the plurality of battery cells 20 in the battery cell columns in the battery 10. That is, the battery cells 20 in the battery cell columns are arranged along the x direction. The second direction y is the arrangement direction of the plurality of battery cell columns in the battery 10. That is, the plurality of battery cell columns in the battery 10 are arranged along the y direction.

[0073] The battery cell 20 includes a first wall 201, and the electrode terminal 214 is provided on the first wall 201. The connecting bar 101 extends along the second direction y and is connected to the first wall 201 of the plurality of battery cells 20 in the plurality of battery cell columns arranged along the second direction y.

[0074] In the embodiment of the present application, the connecting bar 101 is connected to the first wall 201 provided with the electrode terminal 214 of the plurality of battery cells 20 in the plurality of battery cell columns arranged along the second direction y, and the plurality of battery cells 20 are connected into a whole through the connecting bar 101. In this case, side plates may not need to 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 10 and enhance the structural strength and energy density of the battery 10. Therefore, the technical solution of the embodiment of the present application can improve the performance of the battery 10.

[0075] Optionally, in an embodiment of the present application, as Figure 4 shown, the connecting bar 101 includes a middle connecting bar 101a, and the middle connecting bar 101a is connected to the first walls 201 of two adjacent battery cells 20 in the battery cell column.

[0076] That is, the middle connecting bar 101a connects the first walls 201 of two adjacent battery cells 20 in the battery cell column, thereby connecting the two adjacent battery cells 20 in the battery cell column and improving the structural strength of the battery cell column.

[0077] Optionally, in an embodiment of the present application, as Figure 4 shown, the connecting bar 101 includes an end connecting bar 101b, and the end connecting bar 101b is connected to the first wall 201 of the battery cell 20 at the end in the first direction x in the battery cell column.

[0078] The end connecting bar 101b is connected to the first wall 201 of the battery cell 20 at the end in the first direction x in the battery cell column to improve the structural strength of the battery cell 20 at the end in the first direction x in the battery cell column and enhance the structural strength of the battery 10.

[0079] Optionally, in an embodiment of the present application, asFigure 4 As shown, the middle connecting strip 101a is disposed between two adjacent electrode terminals 214 of two adjacent battery cells 20.

[0080] The middle connecting strip 101a is connected to the first walls 201 of two adjacent battery cells 20, and the electrode terminals 214 are disposed on the first walls 201. Therefore, the connecting strip 101 is disposed between two adjacent electrode terminals 214 of two adjacent battery cells 20 to avoid the connecting strip 101 covering the electrode terminals 214 when connecting two adjacent battery cells 20, so as to avoid affecting the electrical connection of the battery 10.

[0081] Optionally, in an embodiment of the present application, the connecting strip 101 may be a metal material plate. That is to say, the connecting strip 101 is entirely made of a metal material. In such a case, an insulating layer is provided on the surface of the connecting strip 101. Optionally, the insulating layer may be an insulating film adhered to the surface of the connecting strip 101 or insulating paint coated on the surface of the connecting strip 101.

[0082] Optionally, in an embodiment of the present application, the connecting strip 101 may be a non-metal material plate. That is to say, the connecting strip 101 is entirely made of a non-metal insulating material.

[0083] Optionally, in an embodiment of the present application, as Figure 5 shown, a cavity 1013 may be provided inside the connecting strip 101. The cavity 1013 can reduce the weight of the connecting strip 101 while ensuring the strength of the connecting strip 101.

[0084] Optionally, in an embodiment of the present application, the cavity 1013 may be used to accommodate a heat exchange medium to adjust the temperature of the battery cell 20.

[0085] The heat exchange medium may be a liquid, a gas or a solid. Adjusting the temperature means heating or cooling a plurality of battery cells 20. In the case of cooling the battery cells 20, the cavity 1013 may accommodate a cooling medium to adjust the temperature of a plurality of battery cells 20. At this time, the heat exchange medium may also be referred to as a cooling medium, and more specifically, it may be referred to as a coolant, a cooling gas or a cooling solid. In addition, the heat exchange medium may also be used for heating, and the embodiments of the present application do not limit this. Optionally, the heat exchange medium may flow cyclically to achieve a better temperature adjustment effect. Optionally, the heat exchange medium may be water, a mixture of water and ethylene glycol, a refrigerant or air, etc.

[0086] Optionally, in an embodiment of the present application, as Figure 6 shown, the dimension T of the connecting strip 101 in the third direction z is 0.5 - 30 mm, and the third direction z is perpendicular to the first direction x and the second direction y.

[0087] When the dimension T of the connecting bar 101 in the third direction z is too small, the stiffness of the connecting bar 101 is poor and it cannot effectively improve the structural strength of the battery 10. When the dimension T of the connecting bar 101 in the third direction z 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 dimension T of the connecting bar 101 in the third direction z is set to 0.5 - 30 mm, which can not only ensure the energy density of the battery 10 but also improve the structural strength of the battery 10.

[0088] Optionally, in an embodiment of the present application, the dimension T of the connecting bar 101 in the third direction z and the weight M of the battery cell 20 satisfy: 0.05 mm / kg < T / M ≤ 50 mm / kg.

[0089] When T / M is too large, the battery 10 will lose weight energy density. Therefore, the dimension T of the connecting bar 101 in the third direction z and the weight M of the battery cell 20 are set to satisfy 0.05 mm / kg < T / M ≤ 50 mm / kg to ensure the weight energy density of the battery 10.

[0090] Optionally, in an embodiment of the present application, the dimension T of the connecting bar 101 in the third direction z and the weight M of the battery cell 20 may further satisfy: 0.05 mm / kg < T / M ≤ 30 mm / kg to further improve the weight energy density of the battery 10.

[0091] Optionally, in an embodiment of the present application, as Figure 6 shown, the battery cell 20 includes a second wall 202, and the second wall 202 is the wall with the largest surface area in the battery cell 20, and the second direction y is perpendicular to the second wall 202.

[0092] The wall with the largest surface area in the battery cell 20, that is, the second wall 202, is perpendicular to the second direction y. That is to say, the second wall 202 is perpendicular to the arrangement direction of multiple columns of battery cells 20 and parallel to the arrangement direction of multiple battery cells 20 in each column. That is, when multiple battery cells 20 in each column of battery cells 20 are arranged, the relatively smaller surfaces of two adjacent battery cells 20 are arranged opposite to each other. When multiple columns of battery cells 20 are arranged, the second walls 202 with the largest surface area of two adjacent columns of battery cells 20 are arranged opposite to each other. This arrangement method is convenient for the assembly layout of multiple columns of battery cells 20 and other components in the battery 10. For example, a water-cooling plate can be arranged between each column of battery cells 20. In this arrangement, the water-cooling plate faces the second wall 202 of the battery cell 20, that is, opposite to the wall with the largest surface area of the battery cell 20. In this way, the contact area between the water-cooling plate and the battery cell 20 is large, and the battery 10 can be effectively thermally managed.

[0093] Optionally, in an embodiment of the present application, as Figure 4As shown, the end of the connecting bar 101 in the second direction y is fixed to the box body 11 to fix the connecting bar 101.

[0094] Optionally, the end of the connecting bar 101 in the second direction y can be bonded to the box body 11 to be fixed to the box body 11. It should be understood that the end of the connecting bar 101 in the second direction y can also be connected to the box body 11 in other ways, for example, riveting, welding, bolt connection, etc., and the present application does not limit this.

[0095] Optionally, as Figure 4 shown, the end of the connecting bar 101 in the second direction y can be fixed to the outer frame 113 and / or the internal beam 114 of the box body 11.

[0096] Optionally, in an embodiment of the present application, as Figure 6 shown, the connecting bar 101 includes a first surface 1011 and a second surface 1012 that are oppositely arranged in the third direction z. The first surface 1011 is connected to the first wall 201, and the second surface 1012 is connected to the box body 11.

[0097] Specifically, as Figure 6 shown, the second surface 1012 can be connected to the cover body 111 of the box body 11.

[0098] The first surface 1011 of the connecting bar 101 is connected to the first wall 201, and the second surface 1012 of the connecting bar 101 is connected to the box body 11, so that the battery cell 20 is connected to the box body 11 through the connecting bar 101, and the battery cell 20 can be fixed, improving the structural strength of the battery 10.

[0099] Optionally, in an embodiment of the present application, as Figure 7 shown, the second surface 1012 can be spaced from the cover body 111 of the box body 11. In this way, there is enough space between the electrode terminal 214 and the cover body 111 to avoid damage to the electrode terminal 214 due to too small a distance between the electrode terminal 214 and the cover body 111 being collided.

[0100] Optionally, the second surface 1012 of the connecting bar 101 is bonded to the box body 11. It should be understood that the second surface 1012 of the connecting bar 101 can also be connected to the box body 11 in other ways, for example, riveting, welding, bolt connection, etc., and the present application does not limit this.

[0101] Optionally, in an embodiment of the present application, as Figure 6 、 Figure 7 and Figure 8 shown, the box body 11 includes a fixed wall 112, and the fixed wall 112 is connected to the third wall 203 of each battery cell 20 in a plurality of battery cell columns. The third wall 203 and the first wall 201 are separated and oppositely arranged in the third direction z.

[0102] The fixed wall 112 is connected to the third wall 203 of the battery cell 20 to fix the battery cell 20 and improve the structural strength of the battery 10.

[0103] Optionally, in an embodiment of the present application, as Figure 6 and Figure 7 shown, when the battery 10 is disposed in the electrical device, the connection bar 101 is located above the battery cell 20, and the fixed wall 112 is used to support the battery cell 20.

[0104] Specifically, the connection bar 101 is located above the battery cell 20, that is, the electrode terminal 214 of the battery cell 20 faces upward. In the third direction z, the first wall 201 of the battery cell 20 is above the third wall 203. The fixed wall 112 is connected to the third wall 203 to support the battery cell 20 and improve the structural strength of the battery 10.

[0105] Optionally, in an embodiment of the present application, as Figure 8 shown, when the battery 10 is disposed in the electrical device, the connection bar 101 is located below the battery cell 20, and the fixed wall 112 is used to mount the battery cell 20.

[0106] Specifically, the connection bar 101 is located below the battery cell 20, that is, the electrode terminal 214 of the battery cell 20 faces downward. In the third direction z, the first wall 201 of the battery cell 20 is below the third wall 203. The fixed wall 112 is connected to the third wall 203 to mount the battery cell 20. In this case, the wall towards which the electrode terminal 214 faces is not the stress-bearing wall, and there is no need to leave a large gap between the electrode terminal 214, so as to save the space of the battery 10 and improve the energy density of the battery 10.

[0107] Optionally, in an embodiment of the present application, the connection bar 101 is bonded to the first wall 201. The connection bar 101 is fixedly connected to the first wall 201 by bonding, and the structure is simple, which is convenient for processing and assembly.

[0108] It should be understood that the connection bar 101 and the first wall 201 can also be connected by other means, for example, riveting, welding, bolt connection, etc. The present application does not limit this.

[0109] An embodiment of the present application further provides an electrical device, which 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.

[0110] Hereinafter, the 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.

[0111] Using the battery cell 20 and the connection bar 101 shown in the accompanying drawings, the battery 10 was subjected to a safety test according to GB38031-2020, and the test results are shown in Table 1.

[0112] Table 1

[0113] Number T / mm M / Kg T / M mm / kg Test Results 1 0.2 4 0.05 Fire, explosion 2 0.2 5 0.04 Fire, explosion 3 1 5 0.2 No fire, no explosion 4 5 5 1 No fire, no explosion 5 10 2 5 No fire, no explosion 6 15 0.5 30 No fire, no explosion 7 5 2 2.5 No fire, no explosion 8 20 0.5 40 No fire, no explosion 9 25 5 5 No fire, no explosion 10 30 1 30 No fire, no explosion 11 25 0.5 50 No fire, no explosion

[0114] It can be seen from the above test results that the battery 10 provided by the present application can meet the safety performance requirements.

[0115] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein 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 way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that, Comprising: A box body (11); A plurality of battery cell columns, accommodated in the box body (11), the battery cell columns comprising a plurality of battery cells (20) arranged along a first direction (x), and a plurality of the battery cell columns are arranged along a second direction (y), the second direction (y) being perpendicular to the first direction (x), and the battery cell (20) comprising a first wall (201), and an electrode terminal (214) is provided on the first wall (201); A busbar component, the busbar component being electrically connected to the electrode terminal (214); A connecting bar (101), the connecting bar (101) extending along the second direction (y) and being connected to the first walls (201) of a plurality of the battery cells (20) arranged along the second direction (y).

2. The battery according to claim 1, characterized in that, The connecting bar (101) comprises a middle connecting bar (101a), and the middle connecting bar (101a) is connected to the first walls (201) of two adjacent battery cells (20) in the battery cell column.

3. The battery according to claim 1 or 2, characterized in that, The connecting bar (101) comprises an end connecting bar (101b), and the end connecting bar (101b) is connected to the first wall (201) of the battery cell (20) at the end in the first direction (x) in the battery cell column.

4. The battery according to claim 2, wherein The middle connecting bar (101a) is disposed between two adjacent electrode terminals (214) of the two adjacent battery cells (20).

5. The battery according to claim 1 or 2, characterized in that, The connecting bar (101) is a metal material plate.

6. The battery according to claim 5, characterized in that, An insulating layer is provided on the surface of the connecting bar (101).

7. The battery according to claim 1 or 2, characterized in that, The connecting bar (101) is a non-metal material plate.

8. The battery according to claim 1 or 2, characterized in that, A cavity (1013) is provided inside the connecting bar (101).

9. The battery according to claim 8, characterized in that, The cavity (1013) is used to accommodate a heat exchange medium to adjust the temperature of the battery cell (20).

10. The battery according to claim 1 or 2, characterized in that, The dimension T of the connecting bar (101) in a third direction (z) is 0.5 to 30 mm, and the third direction (z) is perpendicular to the first direction (x) and the second direction (y).

11. The battery according to claim 1 or 2, characterized in that, The dimension T of the connecting bar (101) in the third direction (z) and the weight M of the battery cell (20) satisfy: 0.05 mm / kg < T / M ≤ 50 mm / kg, and the third direction (z) is perpendicular to the first direction (x) and the second direction (y).

12. The battery according to claim 11, wherein, 0.05 mm / kg < T / M ≤ 30 mm / kg.

13. The battery according to claim 1 or 2, characterized in that, The battery cell (20) comprises a second wall (202), the second wall (202) being the wall with the largest surface area in the battery cell (20), and the second direction (y) is perpendicular to the second wall (202).

14. The battery according to claim 1 or 2, characterized in that, The end of the connecting bar (101) in the second direction (y) is fixed to the box body (11).

15. The battery according to claim 1 or 2, characterized in that, The connecting bar (101) comprises a first surface (1011) and a second surface (1012) oppositely arranged in the third direction (z), the first surface (1011) being connected to the first wall (201), and the second surface (1012) being connected to the box body (11), and the third direction (z) is perpendicular to the first direction (x) and the second direction (y).

16. The battery according to claim 1 or 2, characterized in that, The box body (11) includes a fixed wall (112), and the fixed wall (112) is connected to the third wall (203) of each battery cell (20) in the plurality of battery cell columns. The third wall (203) is separated from and opposite to the first wall (201) along a third direction (z), and the third direction (z) is perpendicular to the first direction (x) and the second direction (y).

17. The battery according to claim 16, characterized in that, When the battery is disposed in an electrical device, the connecting bar (101) is located below the battery cell (20), and the fixed wall (112) is used for mounting the battery cell (20).

18. The battery according to claim 16, wherein When the battery is disposed in an electrical device, the connecting bar (101) is located above the battery cell (20), and the fixed wall (112) is used for supporting the battery cell (20).

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

20. An electrical device, characterized in that, Comprising: The battery according to any one of claims 1 to 19, wherein the battery is used for providing electric energy.

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