Battery, device using battery, method for preparing battery, and preparation equipment

Abstract

The embodiment of the present application provides a battery, a device using the battery, a method for preparing the battery, and a preparation device, the battery comprising a plurality of battery cells, at least one of which is provided with a pressure relief mechanism, the pressure relief mechanism being used to actuate to release the internal pressure of the battery cell when the internal pressure or internal temperature of the battery cell reaches a threshold value; a protective box, the protective box being used to protect the plurality of battery cells; the protective box being provided with a diversion channel, the diversion channel being used to divert the discharge discharged from the pressure relief mechanism; the plurality of battery cells comprising a first battery cell and a second battery cell arranged adjacently, the first battery cell comprising a pressure relief end provided with the pressure relief mechanism, the pressure relief end of the first battery cell being provided in a direction away from the diversion channel and being staggered with an end of the second battery cell close to the pressure relief end, so as to increase the volume of the diversion channel. The battery provided by the embodiment of the present application has a high safety factor.

Description

Technical Field

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

[0002] Devices such as automobiles, electric bicycles, ships, and energy storage cabinets include batteries, which provide electrical energy for the devices.

[0003] The battery includes a plurality of battery cells and a casing. The plurality of battery cells are arranged in sequence. The casing is arranged on the outside of the plurality of battery cells and forms protection for the plurality of battery cells. The casing is provided with positive and negative electrodes, and each battery cell is connected to the positive and negative electrodes. When the battery is working, the active material inside the battery cell reacts chemically with the electrolyte and provides electrical energy to the load. Among them, a pressure relief mechanism is provided on the battery cell, which is used to actuate to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value, and the discharge discharged from the battery cell through the pressure relief mechanism enters the space formed between the battery cell and the casing.

[0004] However, when some of the battery cells in the battery generate a large amount of gas, the volume and pressure of the emissions are large, which can easily cause the battery case to rupture, and the safety factor of the battery is low. Summary of the invention

[0005] In view of the above problems, the embodiments of the present application provide a battery, a device using the battery, a method for preparing the battery, and a preparation device, wherein the battery can accommodate more emissions and has a higher safety factor.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery, comprising a plurality of battery cells, at least one of the battery cells being provided with a pressure relief mechanism, the pressure relief mechanism being used to be actuated to release the internal pressure of the battery cell when the internal pressure or internal temperature of the battery cell reaches a threshold value; a protective box, the protective box being used to protect the plurality of battery cells; the protective box being provided with a diversion channel, the diversion channel being used to divert emissions discharged from the pressure relief mechanism; the plurality of battery cells comprising a first battery cell and a second battery cell arranged adjacent to each other, the first battery cell comprising a pressure relief end on which the pressure relief mechanism is provided, the pressure relief end of the first battery cell being staggered along a direction away from the diversion channel from an end of the second battery cell close to the pressure relief end so as to increase the volume of the diversion channel.

[0008] In some optional embodiments, the protective box includes a protective plate, which is spaced apart from the multiple battery cells, and the guide channel is formed between the protective plate and the multiple battery cells; the protective plate is provided with a recessed portion, and the recessed portion is used to increase the volume of the guide channel, wherein the recessed portion is formed by the protective plate being recessed toward a side away from the multiple battery cells, and the recessed portion has an inner cavity, and the inner cavity is used to communicate with the guide channel.

[0009] In some optional embodiments, the recessed portion is disposed opposite to the first battery cell.

[0010] In some optional embodiments, the protective box includes a support plate, which is attached to the multiple battery cells, and the guide channel is arranged on a side of the support plate away from the multiple battery cells; the support plate is provided with a through hole, which is used for the discharge to pass through, and the through hole is connected to the guide channel.

[0011] In some optional embodiments, the energy density of the first battery cell is greater than the energy density of the second battery cell.

[0012] In some optional embodiments, the energy density of the first battery cell is 1.1-1.6 times the energy density of the second battery cell.

[0013] In some optional embodiments, the first battery cells and the second battery cells are both provided in plurality, and the first battery cells and the second battery cells are alternately arranged in an arrangement of n first battery cells and m second battery cells, wherein n≥1 and m≥1.

[0014] Compared with the related art, the battery provided by the embodiment of the present application has the following advantages: the battery includes a plurality of battery cells and a protective box, and the plurality of battery cells are arranged in the protective box, so that the protective box can protect the plurality of battery cells. The plurality of battery cells include a first battery cell and a second battery cell, and the volume of the flow guide tube channel can be increased by staggering the pressure relief end of the first battery cell away from the flow guide channel with the end of the second battery cell close to the pressure relief end, so that the pressure relief buffer space in the protective box is larger, the protective box can accommodate more emissions, and the safety factor of the battery is higher.

[0015] A second aspect of an embodiment of the present application provides a device using a battery, which includes the battery described in the first aspect above, and the battery provides electrical energy for the device.

[0016] A third aspect of an embodiment of the present application provides a method for preparing a battery, which is used to prepare the battery described in the first aspect above, including: providing a plurality of battery cells, at least one of the plurality of battery cells is provided with a pressure relief mechanism, wherein the plurality of battery cells include a first battery cell and a second battery cell arranged adjacent to each other; providing a protective box; assembling the plurality of battery cells in the protective box, and forming a guide channel in the protective box; staggering the pressure relief end of the first battery cell and the end of the second battery cell close to the pressure relief end.

[0017] The fourth aspect of an embodiment of the present application provides a battery manufacturing device for preparing the battery described in the first aspect above, including: a battery cell preparation module, used to prepare the multiple battery cells, at least one of the battery cells is provided with a pressure relief mechanism, wherein the multiple battery cells include a first battery cell and a second battery cell arranged adjacent to each other; a protective box preparation module, used to prepare the protective box; an assembly module, used to assemble the multiple battery cells in the protective box; at this time, the pressure relief end of the first battery cell and the end of the second battery cell close to the pressure relief end are staggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use 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 ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of the structure of a device using a battery provided in an embodiment of the present application;

[0020] Figure 2 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 1 ;

[0021] Figure 3 yes Figure 2 Schematic diagram of the explosion structure;

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure of a battery cell when the middle pressure relief mechanism is located at the top of the battery cell;

[0023] Figure 5 yes Figure 3 A schematic diagram of the structure of a battery cell when the middle pressure relief mechanism is located at the bottom of the battery cell;

[0024] Figure 6 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 2 ;

[0025] Figure 7 yes Figure 6 The structural diagram of part A in the figure;

[0026] Figure 8 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 3 ;

[0027] Fig. 9 yes Figure 8 The structural diagram of part B;

[0028] Fig.10 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 4 ;

[0029] Fig.11 yes Fig.10 Schematic diagram of the structure of part C;

[0030] Fig.12 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 5 ;

[0031] Fig.13 yes Fig.12 The structural diagram of the D part;

[0032] Fig.14 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 6 ;

[0033] In the drawings, the drawings are not drawn to scale.

[0034] Marking Description:

[0035] 1: Battery;

[0036] 10: battery cell; 101: first battery cell; 102: second battery cell; 11: electrode assembly; 111: positive electrode tab; 112: negative electrode tab; 12: positive electrode terminal; 13: negative electrode terminal; 14: pressure relief mechanism; 15: housing;

[0037] 20: protection box; 21: protection plate; 211: recessed portion; 22: support plate; 221: through hole; 23: side plate; 24: bottom plate;

[0038] 30: elastic member;

[0039] 40: diversion channel;

[0040] 50: vehicle; 51: driving mechanism; 52: control mechanism. DETAILED DESCRIPTION

[0041] The following detailed description and drawings of the embodiments of the present application are used to 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.

[0042] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", 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 therefore cannot be understood as a limitation on 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 is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0043] The directional words appearing in the following description are all 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 "install", "connect", "connect", and "attach" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0044] In the related art, the battery includes a plurality of battery cells arranged side by side and a protective box surrounding the battery cells, and a flow guide channel is formed in the protective box. In this way, when the pressure relief mechanism of the battery cell is actuated, the emissions in the battery cell are discharged into the flow guide channel through the pressure relief mechanism. However, when some of the battery cells generate a large amount of emissions, the volume and pressure of the emissions are large, which can easily cause the battery's protective box to rupture, and the safety factor of the battery is low.

[0045] In view of this, the multiple battery cells provided in the embodiment of the present application include at least two staggered first battery cells and second battery cells, and one of the first battery cells and the second battery cells is offset in a direction away from the guide channel. In this way, the volume of the guide channel is increased, and the pressure relief buffer space in the protective box is larger, which can allow a larger volume of exhaust gas to flow through, and the safety factor of the battery is higher.

[0046] Figure 1 It is a schematic diagram of the structure of a device using a battery provided in an embodiment of the present application.

[0047] See also Figure 1, an embodiment of the present application provides a device using a battery. Among them, the device can be a mobile device such as a vehicle 50, a ship, a small aircraft, or a non-mobile device that can provide electrical energy, such as an energy storage cabinet. Taking the vehicle 50 as an example, it can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The vehicle 50 may include a driving mechanism 51, a control mechanism 52, and a battery 1. The control mechanism 52 is electrically connected to the driving mechanism 51, and is used to control the start and stop of the driving mechanism 51 as needed to drive the vehicle 50 to move or park. The battery 1 is electrically connected to the control mechanism 52 to provide electrical energy to the control mechanism 52. Among them, the power-consuming components in the vehicle 50 may also include audio, etc.

[0048] Figure 2 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 1 . Figure 3 yes Figure 2 Schematic diagram of the explosion structure. Figure 4 for Figure 3 Schematic diagram of the structure of a battery cell when the middle pressure relief mechanism is located at the top of the battery cell. Figure 5 for Figure 3 Schematic diagram of the structure of a battery cell when the middle pressure relief mechanism is located at the bottom end of the battery cell. Figure 6 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 2 . Figure 7 for Figure 6 Schematic diagram of the structure of part A. Figure 8 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 3 . Fig. 9 for Figure 8 Schematic diagram of the structure of part B. Fig.10 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 4 . Fig.11 for Fig.10 Schematic diagram of the structure of part C.

[0049] See also Figures 2 to 11In some optional embodiments, the battery 1 includes a plurality of battery cells 10, at least one of which is provided with a pressure relief mechanism 14, and optionally, each battery cell 10 is provided with a pressure relief mechanism 14. The pressure relief mechanism 14 is used to actuate to release the internal pressure of the battery cell 10 when the internal pressure or internal temperature of the battery cell 10 reaches a threshold value; a protective box 20, the protective box 20 is used to protect the plurality of battery cells 10; the protective box 20 is provided with a diversion channel 40, the diversion channel 40 is used to divert the exhaust discharged from the pressure relief mechanism 14; the plurality of battery cells 10 include a first battery cell 101 and a second battery cell 102 arranged adjacently, the first battery cell 101 includes a pressure relief end provided with the pressure relief mechanism 14, the pressure relief end of the first battery cell 101 is staggered with an end of the second battery cell 102 close to the pressure relief end in a direction away from the diversion channel 40, so as to increase the volume of the diversion channel 40.

[0050] For details, please refer to Figures 2 to 5 The battery 1 includes a plurality of battery cells 10, and the structure of the battery cell 10 may be a structure well known to those skilled in the art. The battery cell 10 in the present application 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 or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell 10 may be cylindrical, flat, rectangular or in other shapes, etc., which is not limited in the embodiments of the present application. The battery cell 10 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiments of the present application.

[0051] like Figure 4 and Figure 5As shown, the battery cell 10 generally includes an electrode assembly 11 and an electrolyte (not shown). The electrode assembly 11 is composed of a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The battery cell 10 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer serves as a positive electrode tab 111. Taking a lithium-ion battery as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, 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 not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer, and the current collector not coated with the negative electrode active material layer serves as the negative electrode tab 112. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs 111 is multiple and stacked together, and the number of negative electrode tabs 112 is multiple and stacked together. The material of the diaphragm may be polypropylene (referred to as PP) or polyethylene (referred to as PE), etc. In addition, the electrode assembly 11 may be a winding structure or a laminated structure, and the number of electrode assemblies 11 may be one or more, and the embodiment of the present application does not impose specific restrictions on this.

[0052] The battery cell 10 also includes a shell 15. The electrode assembly 11 and the electrolyte are both encapsulated in the shell 15. The shell 15 may be a hollow cuboid, a cube or a cylinder. The shell 15 may be made of aluminum or steel and its alloys, or a plastic material or an aluminum-plastic film. The shell 15 is also provided with a positive electrode terminal 12 and a negative electrode terminal 13. The positive electrode tab 111 is electrically connected to the positive electrode terminal 12, and the negative electrode tab 112 is electrically connected to the negative electrode terminal 13 to output electrical energy. The shell 15 is also provided with the above-mentioned pressure relief mechanism 14. The pressure relief mechanism 14 may be set at any position of the shell 15. For example, the pressure relief mechanism 14 may be set at the top of the shell 15 (such as Figure 4 As shown), bottom (as Figure 5 The pressure relief mechanism 14 may also be disposed between the positive electrode terminal 12 and the negative electrode terminal 13. The present application does not impose any specific limitation on this, as long as the internal pressure of the battery cell 10 can be released.

[0053] The pressure relief mechanism 14 refers to an element or component that can be actuated to release the internal pressure and / or internal substances when the internal pressure or internal temperature of the battery cell 10 reaches a predetermined threshold. The pressure relief mechanism 14 can be specifically in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold, the pressure relief mechanism 14 performs an action or the weak structure provided in the pressure relief mechanism 14 is destroyed, thereby forming an opening or channel for internal pressure release. The threshold referred to in this application may be a pressure threshold or a temperature threshold, and the design of the threshold varies according to different design requirements. For example, the threshold can be designed or determined according to the internal pressure or internal temperature value of the battery cell 10 that is considered to be dangerous or out of control. In addition, the threshold may, for example, depend on one or more of the materials used in the positive electrode plate, the negative electrode plate, the electrolyte and the separator in the battery cell 10.

[0054] The "actuation" mentioned in this application means that the pressure relief mechanism 14 is in action or activated to a certain state, so that the internal pressure of the battery cell 10 can be released. The action of the pressure relief mechanism 14 may include but is not limited to: at least a part of the pressure relief mechanism 14 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 14 is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged from the actuated part as emissions. In this way, the battery cell 10 can be depressurized under controllable pressure or temperature, thereby avoiding potential more serious accidents. The emissions from the battery cell 10 mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative pole pieces, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flames, etc. The high-temperature and high-pressure emissions are discharged in the direction of the pressure relief mechanism 14 of the battery cell, and can be more specifically discharged in the direction of the area where the pressure relief mechanism 14 is actuated. The power and destructive force of such emissions may be great, and may even be sufficient to break through one or more components in this direction.

[0055] A plurality of battery cells 10 are arranged side by side and connected in a preset series-parallel manner via a busbar component (not shown), so that the current formed by each battery cell 10 can be conducted through the busbar component and used to power the device.

[0056] The multiple battery cells 10 can be divided into multiple groups, and each group of battery cells 10 is packaged to form a battery module, and multiple battery modules are packaged again to form the above-mentioned battery 1. Optionally, multiple battery cells 10 can also be directly packaged to form the above-mentioned battery 1. This embodiment does not limit the packaging form of the battery 1.

[0057] Taking a square battery cell as an example, a plurality of square battery cells can be directly packaged into a battery 1 through a protective box 20. The protective box 20 may include a protective plate 21, four side plates 23 and a bottom plate 24, and the protective plate 21, four side plates 23 and the bottom plate 24 are connected and surround the outer sides of the plurality of battery cells 10. The material of the protective box 20 may be metal, plastic, etc.

[0058] The guide channel 40 is formed inside the protection box 20 to prevent the discharge from being discharged outside the protection box 20, that is, to prevent the discharge from causing damage to the surrounding environment and users when the battery 1 is broken.

[0059] like Figure 3 As shown, the battery 1 has an arrangement direction X, a width direction Y and a height direction Z, and the arrangement direction X, the width direction Y and the height direction Z are perpendicular to each other.

[0060] The pressure relief mechanism 14 may be disposed at any end of the battery cell 10 along the height direction Z or along the width direction Y. Then, when the pressure relief mechanisms 14 of multiple battery cells 10 are located at different positions, the number of the guide channels 40 may be one or more.

[0061] In order to increase the volume of the guide channel 40, the plurality of battery cells 10 include at least two staggered battery cells 10. Figures 6 to 11 , taking the case where the guide channel 40 is arranged at the top of the first battery cell 101 along the height direction Z as an example, at this time, the pressure relief mechanism 14 of the first battery cell 101 is arranged at the top of itself along the height direction Z, and the top of the first battery cell 101 along the height direction Z is the pressure relief end of the first battery cell 101, and the pressure relief mechanism 14 of the second battery cell 102 can be arranged at any end of itself along the height direction Z or any end along the width direction Y. Optionally, the second battery cell 102 may not be provided with a pressure relief mechanism 14. Then, the staggered arrangement of the first battery cell 101 and the second battery cell 102 means that the top of the first battery cell 101 along the height direction Z is staggered relative to the top of the second battery cell 102 along the height direction Z in a direction away from the guide channel 40. In this way, the increased volume portion of the guide channel 40 is surrounded by the following wall surfaces, namely, the top surface of the first battery cell 101 and the two side surfaces of the two second battery cells 102 adjacent to the first battery cell 101, namely Figure 7 , Fig. 9 and Fig.11 The slanted straight dashed line fills the part.

[0062] It can be understood that when the first battery cell 101 is adjacent to the side plate 23, the portion of the guide channel 40 with an increased volume is surrounded by the following wall surfaces, namely, the top surface of the first battery cell 101, the side surface of the second battery cell 102 adjacent to the first battery cell 101, and the inner wall surface of the side plate 23.

[0063] At this time, the size of the increased volume of the guide channel 40 can be adjusted by adjusting the height difference between the top of the first battery cell 101 along the height direction Z and the top of the second battery cell 102 along the height direction Z.

[0064] It is understandable that when the pressure relief mechanism 14 of the second battery cell 102 is not disposed at the top along the height direction Z, the battery 1 further includes another guide channel 40. Exemplarily, the pressure relief mechanism 14 of the second battery cell 102 is disposed at one end of the second battery cell 102 along the width direction Y. At this time, the staggered arrangement of the first battery cell 101 and the second battery cell 102 may also include the second battery cell 102 being staggered relative to the first battery cell 101 along the width direction Y to increase the volume of the guide channel 40.

[0065] That is to say, when the battery 1 is provided with a plurality of guide channels 40 , the first battery cells 101 and the second battery cells 102 are staggered, as long as the volume of any one or more guide channels 40 can be increased.

[0066] The embodiment of the present application increases the volume of the guide channel 40 to allow a larger volume of exhaust gas to flow through. In this way, the pressure relief buffer space of the protective box 20 of the battery 1 is larger, and the safety factor of the battery 1 is higher.

[0067] In some optional embodiments, the busbar component and the pressure relief mechanism 14 of the battery cell 10 may be located at the same end of the battery cell 10 , or may be located at different ends of the battery cell 10 .

[0068] When the busbar component and the pressure relief mechanism 14 of the battery cell 10 are located at the same end of the battery cell 10, please continue to refer to Figures 6 to 11 , taking the case where the pressure relief mechanism 14 of the first battery cell 101 is located at the top of its own height direction Z, and the confluence component is arranged at the top of the first battery cell 101 along the height direction Z as an example, at this time, this embodiment does not limit the arrangement position of the pressure relief mechanism 14 of the second battery cell 102. And the battery 1 provided in this embodiment at least has a guide channel 40 arranged at the top of the first battery cell 101.

[0069] Specifically, the protection box 20 includes a protection plate 21 , the protection plate 21 is spaced apart from the plurality of battery cells 10 , and the guide channel 40 is formed between the protection plate 21 and the plurality of battery cells 10 .

[0070] To further increase the pressure relief buffer space and safety factor of battery 1, please refer to Figures 8 to 11 The protective plate 21 is provided with a recessed portion 211, which is used to increase the volume of the guide channel 40, wherein the recessed portion 211 is formed by the protective plate 21 being recessed toward a side away from the plurality of battery cells 10, and the recessed portion 211 has an inner cavity, which is used to communicate with the guide channel 40.

[0071] Specifically, the protective plate 21 is plate-shaped, and the recessed portion 211 is recessed toward the side away from the battery cell 10. In this way, the protective plate 21 forms a recessed portion 211 on the side facing the battery cell 10, and the inner cavity of the recessed portion 211 is connected to the guide channel 40. The volume of the guide channel 40 is further increased, and the increased portion is the inner cavity of the recessed portion 211, that is, Fig. 9 and Fig.11 The rectangular dotted line filling part in the figure can allow a larger volume of exhaust gas to flow through, and the pressure relief buffer space and safety factor of the battery 1 are further improved.

[0072] The recessed portion 211 may be disposed opposite to any battery cell 10 , and the number of the recessed portions 211 may be one or more, which is not limited in this embodiment.

[0073] In some optional embodiments, the recessed portion 211 may be disposed opposite to the battery cell 10 with a larger gas production or volume of the emission to be discharged. Exemplarily, the recessed portion 211 is disposed opposite to the first battery cell 101. In this way, the portion of the guide channel 40 corresponding to the first battery cell 101 may include three parts, namely, the top surface of the first battery cell 101 and the area surrounded by the two side surfaces of the two second battery cells 102 adjacent to the first battery cell 101 ( Figure 7 , Fig. 9 and Fig.11 The inclined straight dashed line filling part in the figure), the guide channel 40 itself and the inner cavity of the recessed portion 211 ( Fig. 9 and Fig.11 The rectangular dotted filled part in the figure), that is, the space of the guide channel 40 at the position corresponding to the first battery cell 101 is larger, and the emissions can smoothly enter the guide channel 40, which reduces the impact of the emissions on the inner wall of the guide channel 40, and the safety factor of the battery 1 is higher.

[0074] In some optional embodiments, the pressure relief mechanism 14 of each battery cell 10 may be located at the top along its own height direction Z. In this case, the battery 1 has a flow guide channel 40, and the structure of the battery 1 is relatively compact.

[0075] In some optional embodiments, the busbar component and the pressure relief mechanism 14 of the first battery cell 101 may be located at the bottom of the first battery cell 101 along the height direction Z or at any end along the width direction Y. The structure is similar to that of the above embodiment and will not be repeated in this embodiment.

[0076] When the busbar component and the pressure relief mechanism 14 of the battery cell 10 are located at different ends of the battery cell 10 , the structure is similar to that of the above embodiment, and will not be described in detail in this embodiment.

[0077] Fig.12 The structure of the battery disclosed in the embodiment of the present application is schematically shown in FIG. Figure 5 . Fig.13 Bit Fig.12 Schematic diagram of the structure of part D.

[0078] See also Fig.12 and Fig.13 , this embodiment takes the pressure relief mechanism 14 of the first battery cell 101 as an example, where the pressure relief mechanism 14 is located at the bottom of the first battery cell 101 in the height direction Z, and the confluence component is arranged at the top of the first battery cell 101 in the height direction Z. At this time, this embodiment does not limit the arrangement position of the pressure relief mechanism 14 of the second battery cell 102. Exemplarily, the pressure relief mechanism 14 of the second battery cell 102 can be located at the bottom or top of the second battery cell 102 in the height direction Z. Then, the battery 1 provided in this embodiment at least has a guide channel 40 arranged at the bottom of the first battery cell 101.

[0079] The protection box 20 further includes a support plate 22 disposed inside the protection box 20, the support plate 22 is located at the bottom end of the first battery cell 101 along the height direction Z, and the support plate 22 is attached to the plurality of battery cells 10, and the guide channel 40 is disposed on a side of the support plate 22 away from the plurality of battery cells 10. In other words, the guide channel 40 is formed between the support plate 22 and the bottom plate 24 of the protection box 20, so that the discharge can be prevented from being discharged outside the protection box 20.

[0080] At this time, in order to discharge the emissions of the first battery cell 101, the support plate 22 is provided with a through hole 221, the through hole 221 is used for the emissions to pass through, and the through hole 221 is connected to the guide channel 40. Among them, the through hole 221 can be arranged opposite to the pressure relief mechanism 14 of the first battery cell 101, so that the emissions can directly enter the guide channel 40 through the through hole 221, making the discharge of the emissions smoother.

[0081] The shape of the through hole 221 is compatible with the shape of the pressure relief mechanism 14 . For example, the through hole 221 may be a circular hole, a square hole, an oblong hole, or the like.

[0082] At this time, depending on the different setting positions of the pressure relief mechanism 14 of the second battery cell 102, the bottom ends of the first battery cell 101 and the second battery cell 102 along the height direction Z can be set flush or staggered, as long as a guide channel 40 is formed at the position corresponding to the first battery cell 101.

[0083] Then, in order to increase the volume of the guide channel 40, the bottom end of the first battery cell 101 along the height direction Z and the bottom end of the second battery cell 102 along the height direction Z can be staggered, and the bottom end of the first battery cell 101 along the height direction Z is located between the two ends of the second battery cell 102. In this way, the volume of the guide channel 40 is increased, and the pressure relief buffer space of the protection box 20 of the battery 1 is larger, which can provide a larger volume of discharge flow, and the safety factor of the battery 1 is higher.

[0084] Among them, the height difference between the bottom end of the first battery cell 101 along the height direction Z and the bottom end of the second battery cell 102 along the height direction Z is proportional to the volume increase of the guide channel 40. The greater the height difference, the greater the volume increase of the guide channel 40. The size of the height difference can be set as needed.

[0085] For example, see Fig.12 , when the pressure relief mechanism 14 of the second battery cell 102 is not arranged at the bottom end along its own height direction Z, at this time, the area of ​​the support plate 22 corresponding to the second battery cell 102 can contact the bottom plate. At this time, during the assembly process of the battery 1, the bottom ends of the first battery cell 101 and the second battery cell 102 along their own height direction Z are staggered so that a guide channel 40 is formed below the first battery cell 101. Then, in this embodiment, in order to increase the volume of the guide channel 40, the height difference between the bottom end of the first battery cell 101 along the height direction Z and the bottom end of the second battery cell 102 along the height direction Z can be increased.

[0086]

[00861] With respect to the support plate 22 and the bottom plate 24, when the pressure relief mechanism 14 is provided at the bottom end of the battery cell 10 along the height direction Z, the protection box 20 is further provided with a support plate 22 inside, and the support plate 22 is used to support the plurality of battery cells 10. When the pressure relief mechanisms 14 of the plurality of battery cells 10 are all located at the top end along the height direction Z, the plurality of battery cells 10 can be directly connected to the bottom plate 24 of the protection box 20, and the bottom plate 24 is used to support the plurality of battery cells 10.

[0087] When the bottom ends of the plurality of battery cells 10 are aligned along the height direction Z, the side of the support plate 22 or the bottom plate 24 that contacts the plurality of battery cells 10 is a plane (eg Figure 6 and Figure 8When the plurality of battery cells 10 are staggered at the bottom ends along the height direction Z, the side of the support plate 22 or the bottom plate 24 that contacts the plurality of battery cells 10 is a concave-convex surface (such as Fig.10 and Fig.12 shown).

[0088] Please continue reading Fig.10 When the bottom ends of the first battery cell 101 and the second battery cell 102 are staggered along the height direction Z, a recessed support portion is provided on the bottom plate 24, and the bottom end of the first battery cell 101 along the height direction Z can be extended into and supported in the support portion, so that the bottom end of the first battery cell 101 is plugged into the support portion, and the bottom end of the first battery cell 101 is relatively fixed to the bottom plate 24, the first battery cell 101 is relatively stable, and the fastening effect of the battery 1 is good.

[0089] Specifically, the bottom wall of the first battery cell 101 contacts the bottom wall surface of the support portion, and the side wall of the first battery cell 101 contacts the side wall surface of the support portion, so that the inner wall surface of the support portion forms a limit to the bottom end of the first battery cell 101. Even if the first battery cell 101 is squeezed by the adjacent battery cell 10, for example, the second battery cell 102 is offset and squeezes the first battery cell 101, at this time, only the part of the first battery cell 101 extending out of the support portion will be offset, and the part of the first battery cell 101 located in the support portion is still engaged with the support portion, that is, the fastening effect of the first battery cell 101 is better. The stability of the battery 1 as a whole is also better.

[0090] It can be understood that when a concave supporting portion is provided on the bottom plate 24 , a convex portion is also correspondingly provided on the bottom plate 24 , and the second battery cell 102 can be supported on the convex portion.

[0091] The raised portion can be bonded and fixed to the bottom plate 24 or integrally formed. Please refer to 10. In this case, the bottom plate 24 can be a plate-like structure, the raised portion is connected to the bottom plate 24, and the raised portion and the bottom plate 24 together form a concave and convex support surface. In this case, the bottom plate 24 has a high strength. And the outer side surface of the bottom plate 24 is a plane, which is convenient for assembling the battery 1 and the device.

[0092] Of course, when a recessed support portion is provided on the support plate 22 , the clamping principle between the support plate 22 and the battery cell 10 is similar to the clamping principle between the bottom plate and the battery cell 10 , and will not be described in detail in this embodiment.

[0093] Fig.14 The structure of the battery disclosed in the embodiment of the present application is shown in FIG. Figure 6 . See Fig.14In some optional embodiments, the battery 1 may further include an elastic member 30, which is connected to the bottom plate 24 and is used to support the battery cell 10. In this way, the shock absorption and impact resistance of the battery cell 10 and the battery 1 can be improved. The elastic member 30 may be a spring, elastic rubber, etc., which is not limited in this embodiment.

[0094] Wherein, each battery cell 10 may be provided with an elastic member 30 correspondingly to buffer and reduce shock for each battery cell 10 .

[0095] In order to fix the elastic member 30, a receiving groove (not shown) is provided on the bottom plate 24, and the receiving groove is used to receive the elastic member 30. In this way, when the battery 1 is impacted and the battery cell 10 is offset relative to the bottom plate 24, the elastic member 30 can be elastically deformed in the receiving groove. At this time, the receiving groove can play a guiding role to prevent the elastic member 30 from being skewed during the deformation process, causing the battery cell 10 to be skewed.

[0096] The number of the accommodating grooves may be less than the number of the battery cells 10 to avoid reducing the strength of the bottom plate 24 due to too many accommodating grooves.

[0097] Of course, when a support plate 22 is provided in the protection box 20 , the elastic member 30 is connected to the support plate 22 , which will not be described in detail in this embodiment.

[0098] In some optional embodiments, the first battery cell 101 and the second battery cell 102 may be the same battery cell or different battery cells. The "same" mentioned here means that the first battery cell 101 and the second battery cell 102 are basically consistent in terms of chemical system, shape, size, volume, mass, energy density, etc., and the "different" mentioned here means that at least one of the first battery cell 101 and the second battery cell 102 is significantly different in terms of chemical system, shape, size, volume, mass, energy density, etc.

[0099] In some optional embodiments, the energy density of the first battery cell 101 is greater than the energy density of the second battery cell 102, wherein energy density refers to the energy released by a battery per unit mass or per unit volume, i.e., weight energy density or volume energy density. In some embodiments, the energy density of the first battery cell 101 is 1.1-1.6 times the energy density of the second battery cell 102. The energy density of the first battery cell 101 is greater than the energy density of the second battery cell 102, and the volume of the emissions generated when the pressure relief mechanism 14 of the first battery cell 101 is actuated is relatively large. By increasing the volume of the guide channel 40 arranged opposite to the first battery cell 101, it is beneficial to discharge the emissions more smoothly.

[0100] In some optional embodiments, the first battery cell 101 may be a ternary lithium battery cell, specifically, for example, lithium nickel cobalt manganese oxide (LiNiMnCoO 2 , NCM) battery cells or lithium nickel cobalt aluminum oxide (LiNiCoAlO 2 , NCA) battery cell, the second battery cell 102 may be lithium iron phosphate (LiFePO 4 , LFP) battery cells or lithium cobalt oxide (LiCoO 2 )Battery cell.

[0101] In some optional embodiments, this embodiment does not limit the number of the first battery cell 101 and the second battery cell 102. The number of the first battery cell 101 and the second battery cell 102 can be set as needed. Exemplarily, the number of the first battery cell 101 is one, and the number of the second battery cell 102 is one. The number of the first battery cell 101 is one, and the number of the second battery cell 102 is multiple. Of course, the number of the first battery cell 101 and the number of the second battery cell 102 can also be multiple.

[0102] When both the first battery cell 101 and the second battery cell 102 are provided in plural, the first battery cell 101 and the second battery cell 102 are alternately arranged in an arrangement of n first battery cells 101 and m second battery cells 102 , wherein n≥1, m≥1, and n and m are both integers.

[0103] That is, this embodiment does not limit the arrangement of the first battery cells 101 and the second battery cells 102. For example, three first battery cells 101, two second battery cells 102, and four first battery cells 101 are arranged in sequence.

[0104] Optionally, the first battery cell 101 and the second battery cell 102 can be arranged adjacent to each other in sequence, that is, both sides of the first battery cell 101 are arranged adjacent to the second battery cell 102, and both sides of the second battery cell 102 are arranged adjacent to the first battery cell 101. In this way, the first battery cell 101 with a larger discharge amount and the second battery cell 102 with a smaller discharge amount are arranged alternately, which can avoid excessive accumulation of discharge in a certain area in the guide channel 40, and help the discharge of the first battery cell 101 and the discharge of the second battery cell 102 to be evenly distributed in the guide channel 40, the pressure distribution in the guide channel 40 is more uniform, and the safety factor of the battery 1 is higher.

[0105] The present application also provides a method for preparing a battery 1, which is used to prepare the above-mentioned battery 1, and comprises:

[0106] S100 , providing a plurality of battery cells 10 , arranging the plurality of battery cells 10 in parallel along an arrangement direction X, at least one battery cell 10 being provided with a pressure relief mechanism 14 , wherein the plurality of battery cells 10 include a first battery cell 101 and a second battery cell 102 that are adjacently arranged.

[0107] S200: Provide a protective box 20.

[0108] S300, assembling a plurality of battery cells 10 in the protection box 20, and forming a flow guiding channel 40 in the protection box 20. When the pressure relief mechanism 14 is actuated, the interior of the battery cell 10 and the flow guiding channel 40 can be connected.

[0109] S400, stagger the pressure relief end of the first battery cell 101 and the end close to the pressure relief end of the second battery cell 102. In this way, the volume of the guide channel 40 is increased, the space for the exhaust gas to flow in the guide channel 40 is larger, the pressure relief buffer space of the battery 1 is larger, and the safety factor of the battery 1 is higher.

[0110] The embodiment of the present application also provides a manufacturing device for a battery 1, which is used to prepare the above-mentioned battery 1, and includes: a battery cell preparation module, which is used to prepare a plurality of battery cells 10, at least one battery cell 10 is provided with a pressure relief mechanism 14, wherein the plurality of battery cells 10 include a first battery cell 101 and a second battery cell 102 arranged adjacent to each other; a protective box preparation module, which is used to prepare a protective box 20; an assembly module, which is used to assemble the plurality of battery cells 10 in the protective box 20; at this time, the pressure relief end of the first battery cell 101 and the end of the second battery cell 102 close to the pressure relief end are staggered.

[0111] Among them, the battery cell preparation module, the protection box preparation module, and the assembly module can be independent of each other, or can be components of the preparation equipment, which is not limited in this embodiment.

[0112] Specifically, when preparing the battery 1 , firstly, the battery cell 10 and the protective box 20 are prepared by the battery cell preparation module and the protective box preparation module, and the guide channel 40 is formed on the protective box 20 .

[0113] During or before assembling the battery 1, the battery cells 10 can be arranged side by side, so that the assembly module can accommodate the multiple battery cells 10 arranged side by side in the protective box 20. Then, the pressure relief end of the first battery cell 101 and the end of the second battery cell 102 close to the pressure relief end are staggered, so that the volume of the guide channel 40 is increased, the space for the discharge flow in the guide channel 40 is larger, the pressure relief buffer space of the battery 1 is larger, and the safety factor of the battery 1 is higher.

[0114] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery comprising: A plurality of battery cells, at least one of which is provided with a pressure relief mechanism, the pressure relief mechanism being used to be actuated to release the internal pressure of the battery cell when the internal pressure or internal temperature of the battery cell reaches a threshold value; A protection box, the protection box is used to protect the multiple battery cells; the protection box is provided with a diversion channel, the diversion channel is used to divert the exhaust discharged from the pressure relief mechanism; The plurality of battery cells include a first battery cell and a second battery cell that are adjacently arranged, the first battery cell includes a pressure relief end on which the pressure relief mechanism is arranged, and the pressure relief end of the first battery cell is staggered with an end of the second battery cell that is close to the pressure relief end in a direction away from the guide channel, so as to increase the volume of the guide channel; Wherein, the protection box comprises a protection plate, the protection plate is spaced apart from the plurality of battery cells, and the guide channel is formed between the protection plate and the plurality of battery cells; The protective plate is provided with a recessed portion, which is used to increase the volume of the guide channel, wherein the recessed portion is formed by the protective plate being recessed toward a side away from the plurality of battery cells, and the recessed portion has an inner cavity, which is used to communicate with the guide channel.

2. The battery according to claim 1, wherein The recessed portion is disposed opposite to the first battery cell.

3. The battery according to claim 1, wherein The protection box comprises a support plate, the support plate is attached to the plurality of battery cells, and the guide channel is arranged on a side of the support plate away from the plurality of battery cells; The support plate is provided with a through hole, the through hole is used for the discharge to pass through, and the through hole is communicated with the guide channel.

4. The battery according to any one of claims 1 to 3, wherein: The energy density of the first battery cell is greater than the energy density of the second battery cell.

5. The battery according to claim 4, wherein The energy density of the first battery cell is 1.1-1.6 times the energy density of the second battery cell.

6. The battery according to any one of claims 1 to 3, wherein: The first battery cells and the second battery cells are both provided in plurality, and the first battery cells and the second battery cells are alternately arranged in an arrangement manner of n first battery cells and m second battery cells, wherein n≧1, m≧1.

7. A device using a battery, comprising the battery according to any one of claims 1 to 6, wherein the battery provides electrical energy for the device.

8. A method for preparing a battery, for preparing the battery according to any one of claims 1 to 6, comprising: Providing a plurality of battery cells, at least one of the battery cells is provided with a pressure relief mechanism, wherein the plurality of battery cells include a first battery cell and a second battery cell that are adjacently arranged; Provide protective box; Assembling the plurality of battery cells in the protective box and forming a flow guide channel in the protective box; The end of the first battery cell where the pressure relief mechanism is arranged is staggered with the end of the second battery cell where the pressure relief mechanism is arranged.

9. A battery manufacturing device for preparing the battery according to any one of claims 1 to 6, comprising: A battery cell preparation module, used for preparing the plurality of battery cells, at least one of the battery cells being provided with a pressure relief mechanism, wherein the plurality of battery cells include a first battery cell and a second battery cell that are adjacently arranged; A protection box preparation module, used for preparing the protection box; An assembly module is used to assemble the plurality of battery cells in the protection box; at this time, the end of the first battery cell where the pressure relief mechanism is arranged is staggered with the second battery cell.

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