Battery, device, and preparation method and preparation device of battery

Abstract

The invention provides a battery, a device, a preparation method of the battery and a preparation device, relates to the technical field of energy storage, and is used for solving the problem of poor use safety of the battery, the battery comprises a first battery monomer and a second battery monomer, the first battery monomer comprises a first pressure relief mechanism, and the second battery monomer comprises a second pressure relief mechanism, the energy density of the first battery cell is greater than that of the second battery cell, and the area of the first pressure relief mechanism is greater than that of the second pressure relief mechanism. The device comprises the battery. The preparation method of the battery comprises the following steps: configuring a first battery monomer; a second battery cell is configured. The preparation device of the battery comprises a first battery monomer configuration module and a second battery monomer configuration module. The battery, the device, the preparation method of the battery and the preparation device provided by the invention are used for improving the use safety of the battery.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. In the development of battery technology, in addition to improving battery performance, safety issues are also an issue that cannot be ignored. If the safety of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem that needs to be solved in battery technology. Summary of the invention

[0003] In view of the above problems, the embodiments of the present application provide a battery, a device, a method for preparing a battery, and a device for preparing a battery to improve the safety of battery use.

[0004] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0005] A first aspect of an embodiment of the present application provides a battery, comprising:

[0006] A first battery cell, the first battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism being configured to be actuated to release the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold value;

[0007] a second battery cell, the second battery cell comprising a second pressure relief mechanism, the second pressure relief mechanism being configured to be actuated to release the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value;

[0008] The energy density of the first battery cell is greater than the energy density of the second battery cell, and the area of ​​the first pressure relief mechanism is greater than the area of ​​the second pressure relief mechanism.

[0009] Compared with the prior art, the battery provided in the embodiment of the present application has the following advantages:

[0010] The battery provided in the embodiment of the present application is provided with a first pressure relief mechanism on the first battery cell, so that when the internal pressure or temperature of the first battery cell reaches a threshold value, the first battery cell can release the internal pressure; the second pressure relief mechanism is provided on the second battery cell, so that when the internal pressure or temperature of the second battery cell reaches a threshold value, the second battery cell can also release the internal pressure; the energy density of the first battery cell is greater than the energy density of the second battery cell, and the failure reaction of thermal failure of the first battery cell is more severe than the failure reaction of thermal failure of the second battery cell. By limiting the area of ​​the first pressure relief mechanism to be larger than the area of ​​the second pressure relief mechanism, the first battery cell with a more severe failure reaction can release the pressure in a timely and effective manner through the first pressure relief mechanism with a larger area, thereby effectively alleviating the rapid temperature rise of the first battery cell, thereby effectively reducing the probability of a chain reaction caused by the thermal failure of the first battery cell, and improving the overall safety of the battery.

[0011] In some embodiments, the ratio of the area A1 of the first pressure relief mechanism to the area A2 of the second pressure relief mechanism satisfies: 1.5≤A1 / A2≤4. In this way, the first battery cell and the second battery cell can release pressure in a timely and effective manner, thereby improving the safety of battery use.

[0012] In some embodiments, the ratio of the energy density E1 of the first battery cell to the energy density E2 of the second battery cell satisfies: 1.26≤E1 / E2≤2.14. In this way, the battery capacity can be improved while ensuring the safety of the battery.

[0013] In some embodiments, 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, where n≥1 and m≥1. In this way, the first battery cells and the second battery cells with different energy densities are arranged at intervals, which is conducive to mitigating the spread of heat diffusion and thereby improving the safety of battery use.

[0014] In some embodiments, the battery further includes a discharge channel, which is arranged opposite to the first pressure relief mechanism and / or the second pressure relief mechanism, and is configured to collect discharge from the first battery cell when the first pressure relief mechanism is actuated, and / or to collect discharge from the second battery cell when the second pressure relief mechanism is actuated. Providing the discharge channel can release the pressure inside the first battery cell and the second battery cell in time when the internal pressure and temperature of the first battery cell and the second battery cell reach a threshold value, thereby making the battery safer to use.

[0015] In some embodiments, at least two discharge channels are provided, and the discharge channels are isolated from each other. The first pressure relief mechanism and the second pressure relief mechanism are respectively arranged opposite to different discharge channels. The emissions of the first battery cell and the second battery cell can be discharged to the outside of the battery in a timely and effective manner, and the possibility of solid matter released by the first battery cell and the second battery cell clogging the discharge channel is effectively reduced, thereby improving the safety of battery use.

[0016] In some embodiments, the number of first battery cells is at least two, and the first pressure relief mechanisms of two adjacent first battery cells are respectively arranged relative to different emission channels. In this way, different first battery cells can release emissions through different emission channels, so that the emissions of the first battery cells can be discharged to the outside of the battery in a timely and effective manner. Moreover, the probability of thermal failure of the first battery cell leading to thermal failure of the adjacent first battery cell can be effectively reduced, which is conducive to alleviating the chain reaction of thermal failure and improving the safety of battery use.

[0017] In some embodiments, the number of second battery cells is at least two, and the second pressure relief mechanisms of two adjacent second battery cells are respectively arranged relative to different emission channels. In this way, different second battery cells can release emissions through different emission channels, so that the emissions of the second battery cells can be discharged to the outside of the battery in a timely and effective manner. Moreover, the probability of thermal failure of the second battery cell leading to thermal failure of the second battery cell adjacent to it can be effectively reduced, which is conducive to alleviating the chain reaction of thermal failure and improving the safety of battery use.

[0018] In some embodiments, the battery further comprises a box body, the box body has a plurality of walls, the plurality of walls are used to enclose and form a receiving cavity for receiving the first battery cell and the second battery cell, at least one of the plurality of walls has a hollow inner cavity, and the hollow inner cavity is used to form a discharge channel. The box body is used to protect the first battery cell and the second battery cell placed in the receiving cavity, and the hollow inner cavity forming the discharge channel is provided in at least one of the plurality of walls of the box body, so that when the internal pressure or temperature of the first battery cell and the second battery cell reaches a threshold value, the emissions of the first battery cell and the second battery cell can be discharged into the hollow inner cavity, so that the emissions of the first battery cell and the second battery cell when thermal failure occurs can be timely and effectively discharged to the outside of the battery, thereby improving the safety of the battery.

[0019] In some embodiments, the multiple walls include a bottom wall, which is used to support a first battery cell and a second battery cell, and the bottom wall has a hollow inner cavity. In this way, emissions in the first battery cell are released downward and enter the hollow inner cavity at the bottom through a pressure relief mechanism. At the same time, emissions in the second battery cell are released downward and enter the hollow inner cavity at the bottom through a second pressure relief mechanism. This arrangement of the battery allows the battery to release emissions to the bottom of the vehicle after being placed in the battery compartment of the vehicle, rather than to the passenger compartment above the battery compartment, thereby further increasing the safety of battery use.

[0020] In some embodiments, at least one wall is configured to be destroyed when the first pressure relief mechanism and / or the second pressure relief mechanism are actuated, so that the emissions from the first battery cell and / or the second battery cell pass through the at least one wall into the corresponding emission channel. In this way, when the internal pressure or temperature of the first battery cell reaches a threshold value, the first pressure relief mechanism of the first battery cell is actuated, and the emissions inside the first battery cell are released, and / or when the internal pressure or temperature of the second battery cell reaches a threshold value, the second pressure relief mechanism of the second battery cell is actuated, and the emissions inside the second battery cell are released, the emissions released by the first battery cell and / or the second battery cell can act on at least one wall of the box body, so that the part of the box body opposite to the first pressure relief mechanism and / or the part of the box body opposite to the second pressure relief mechanism are destroyed, and the hollow inner cavity of the box body is connected to the first pressure relief mechanism and / or the second pressure relief mechanism, so that the emissions inside the first battery cell and / or the second battery cell can be discharged into the emission channel in a timely and effective manner, thereby further increasing the safety of battery use.

[0021] In some embodiments, at least one wall is provided with a first through hole, and the first through hole is configured to be connected to the emission channel so that the emissions from the first battery cell and / or the second battery cell enter the corresponding emission channel via the first through hole when the first battery cell and / or the second battery cell are actuated. In this way, when the internal pressure or temperature of the first battery cell reaches a threshold value, the first pressure relief mechanism of the first battery cell is actuated and the emissions inside the first battery cell are released, and / or when the internal pressure or temperature of the second battery cell reaches a threshold value, the second pressure relief mechanism of the second battery cell is actuated and the emissions inside the second battery cell are released, the emissions released by the first battery cell and / or the second battery cell enter the hollow inner cavity of the box body through the first through hole, so that the emissions inside the first battery cell and / or the second battery cell can be discharged into the emission channel in a timely and effective manner, thereby further increasing the safety of battery use.

[0022] In some embodiments, the battery also includes a thermal management component for containing a fluid to regulate the temperature of the first battery cell and the second battery cell. The thermal management component is disposed between the first battery cell and the second battery cell and at least one wall. The thermal management component is configured to be destroyed when the first pressure relief mechanism and / or the second pressure relief mechanism is actuated to allow the fluid to flow out. In this way, emissions from the first battery cell and / or the second battery cell can enter the emission channel through the destroyed thermal management component, and since the thermal management component is destroyed, the fluid flows out, and the temperature inside the battery is quickly reduced by the fluid, which helps to alleviate the chain reaction of thermal failure and improve the safety of battery use.

[0023] In some embodiments, the thermal management component is provided with a second through hole, and the second through hole is configured to be connected to the exhaust channel so that when the first pressure relief mechanism and / or the second pressure relief mechanism is actuated, the emissions from the first battery cell and / or the second battery cell enter the corresponding exhaust channel via the second through hole. In this way, the emissions released by the first battery cell and / or the second battery cell can quickly and smoothly enter the exhaust channel through the second through hole, thereby improving the safety of battery use.

[0024] In some embodiments, the second through hole is connected to the exhaust channel via the first through hole, so that the emissions released by the first battery cell and / or the second battery cell can quickly and smoothly enter the first through hole through the second through hole, and then enter the exhaust channel, thereby improving the safety of battery use.

[0025] A second aspect of an embodiment of the present application provides a device, which includes the above-mentioned battery, and the battery is used to provide electrical energy.

[0026] The device of the present application utilizes the above-mentioned battery to provide electrical energy. Therefore, by limiting the area of ​​the first pressure relief mechanism to be larger than the area of ​​the second pressure relief mechanism, the first battery cell with a more violent failure reaction can release pressure in a timely and effective manner through the first pressure relief mechanism with a larger area, effectively alleviating the rapid temperature rise of the first battery cell, thereby effectively reducing the probability of a chain reaction caused by thermal failure of the first battery cell, and improving the overall safety of the battery.

[0027] A third aspect of the embodiments of the present application provides a method for preparing a battery, which comprises the following steps:

[0028] configuring a first battery cell, the first battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism being configured to be actuated to release the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold value;

[0029] configuring a second battery cell, the second battery cell comprising a second pressure relief mechanism, the second pressure relief mechanism being configured to be actuated to release the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value;

[0030] The energy density of the first battery cell is greater than the energy density of the second battery cell, and the area of ​​the first pressure relief mechanism is greater than the area of ​​the second pressure relief mechanism.

[0031] The preparation method of the battery provided in the present embodiment configures a first battery cell with a higher energy density and a second battery cell with a lower energy density, and limits the first pressure relief mechanism of the configured first battery cell and the area of ​​the second pressure relief mechanism to be larger than that of the second battery cell. When the first battery cell and the second battery cell thermally fail, even if the failure reaction of the thermal failure of the first battery cell is more severe than that of the thermal failure of the second battery cell, the first battery cell with a more severe failure reaction can release the pressure in a timely and effective manner through the first pressure relief mechanism with a larger area. At the same time, the second battery cell can also release the pressure in a timely and effective manner through the second pressure relief mechanism, thereby effectively alleviating the rapid temperature rise of the first battery cell, thereby effectively reducing the probability of a chain reaction caused by the thermal failure of the first battery cell, and improving the overall safety of the battery.

[0032] A fourth aspect of an embodiment of the present application provides a battery manufacturing device, comprising:

[0033] A first battery cell configuration module, configured to configure a first battery cell, the first battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism being configured to be actuated to release the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold value;

[0034] A second battery cell configuration module, configured to configure a second battery cell, the second battery cell comprising a second pressure relief mechanism, the second pressure relief mechanism being configured to be actuated to release the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value;

[0035] The energy density of the first battery cell is greater than the energy density of the second battery cell, and the area of ​​the first pressure relief mechanism is greater than the area of ​​the second pressure relief mechanism.

[0036] The battery preparation device provided in the present embodiment configures a first battery cell with a higher energy density through a first battery cell configuration module, and configures a second battery cell with a lower energy density through a second battery cell configuration module, and limits the first pressure relief mechanism of the configured first battery cell and the area of ​​the second pressure relief mechanism to be larger than that of the second battery cell. When the first battery cell and the second battery cell thermally fail, even if the failure reaction of the thermal failure of the first battery cell is more severe than that of the thermal failure of the second battery cell, the first battery cell with a more severe failure reaction can release pressure in a timely and effective manner through the first pressure relief mechanism with a larger area. At the same time, the second battery cell can also release pressure in a timely and effective manner through the second pressure relief mechanism, thereby effectively alleviating the rapid temperature rise of the first battery cell, thereby effectively reducing the probability of a chain reaction caused by the thermal failure of the first battery cell, and improving the overall safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the structure of the vehicle of the present application;

[0038] Figure 2 is a schematic structural diagram of a battery module according to an embodiment of the present application;

[0039] Figure 3 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

[0040] Figure 4 The structure of the battery in the embodiment of the present application is shown in FIG. Figure 1 ;

[0041] Figure 5 The explosion of the battery in the embodiment of the present application Figure 1 ;

[0042] Figure 6 The structure of the battery in the embodiment of the present application is shown in FIG. Figure 2 ;

[0043] Figure 7 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0044] Figure 8 is a front view of a battery cell of an embodiment of the present application;

[0045] Fig. 9 is a right side view of a battery cell of an embodiment of the present application;

[0046] Fig.10 is a top view of a battery cell according to an embodiment of the present application;

[0047] Fig.11 The explosion of the battery in the embodiment of the present application Figure 2 ;

[0048] Fig.12 The structure of the battery in the embodiment of the present application is shown in FIG. Figure 3 ;

[0049] Fig.13 is a schematic structural diagram of a first battery cell in an embodiment of the present application;

[0050] Fig.14 is a schematic structural diagram of a second battery cell in an embodiment of the present application;

[0051] Fig.15 The explosion of the battery in the embodiment of the present application Figure 3 ;

[0052] Fig.16 This is a schematic diagram of the structure of the bottom wall of an embodiment of the present application. Figure 1 ;

[0053] Fig.17 This is a schematic diagram of the structure of the bottom wall of an embodiment of the present application. Figure 2 ;

[0054] Fig.18 is a schematic structural diagram of a thermal management component according to an embodiment of the present application;

[0055] Fig.19 This is a schematic diagram of the structure of the bottom wall of another embodiment of the present application. Figure 1 ;

[0056] Fig. 20 This is a schematic diagram of the structure of the bottom wall of another embodiment of the present application. Figure 2 ;

[0057] Fig.21 It is a schematic structural diagram of a thermal management component of another embodiment of the present application.

[0058] Reference numerals:

[0059] 1- Vehicle;

[0060] 11-Battery;

[0061] 111 - a first battery cell;

[0062] 1111-first pressure relief mechanism;

[0063] 1112-positive electrode terminal;

[0064] 1113 - negative electrode terminal;

[0065] 1114-housing;

[0066] 112 - a second battery cell;

[0067] 1121: second pressure relief mechanism;

[0068] 113- box body;

[0069] 1131-bottom wall;

[0070] 1132-side wall;

[0071] 1133-first through hole;

[0072] 114- first thermal insulation member;

[0073] 115 - second thermal insulation member;

[0074] 116 - third thermal insulation member;

[0075] 117- discharge channel;

[0076] 118- thermal management components;

[0077] 1181- second through hole;

[0078] 12- Controller;

[0079] 13- Motor. DETAILED DESCRIPTION

[0080] Battery is a device that converts chemical energy into electrical energy and is widely used in new energy vehicles, energy storage power stations and other fields.

[0081] An existing type of battery includes a box body, and a plurality of battery cells arranged in the box body, wherein the plurality of battery cells are connected in series and / or in parallel. The plurality of battery cells include a first battery cell and a second battery cell, wherein the energy density of the first battery cell is greater than the energy density of the second battery cell, the first battery cell is provided with a first pressure relief mechanism, the first pressure relief mechanism is used to release the gas inside the first battery cell, thereby ensuring the safety of the first battery cell, and the second battery cell is provided with a second pressure relief mechanism, the second pressure relief mechanism is used to release the gas inside the second battery cell, thereby ensuring the safety of the second battery cell.

[0082] However, the inventors of the present application have discovered that when a battery cell fails due to thermal failure, the failure reaction of the first battery cell will be more severe than that of the second battery cell, that is, the high-temperature gas generated by the first battery cell is much greater than the high-temperature gas generated by the second battery cell, so the first battery cell is more likely to increase in temperature, thereby triggering a chain reaction, further aggravating the thermal failure of the first battery cell and causing problems with battery safety.

[0083] In order to solve the problem that a first battery cell with a violent failure reaction triggers a chain reaction, thereby causing the problem of battery safety, the present application provides a battery, a device, a battery preparation method and a battery preparation device, by providing a first pressure relief mechanism on the first battery cell, and providing a second pressure relief mechanism on the second battery cell, and limiting the area of ​​the first pressure relief mechanism to be larger than the area of ​​the second pressure relief mechanism, so that the first battery cell with a higher energy density can also release the internal pressure in time through the first pressure relief mechanism with a larger area when the internal pressure or temperature reaches a threshold value, thereby effectively alleviating the rapid temperature rise of the first battery cell, effectively reducing the chain reaction caused by the thermal failure of the first battery cell, and improving the safety of battery use.

[0084] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application, so that the above-mentioned purposes, features and advantages of the embodiments of the present application can be more obvious and easy to understand. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of this application.

[0085] An embodiment of the present application provides a device and a battery. The device provided by the present application includes a battery, and the battery is used to provide electrical energy. The device provided by the present application is, for example, a mobile phone, a portable device, a laptop computer, an electric car, an electric car, a ship, a spacecraft, an electric toy, and an electric tool, etc., wherein the spacecraft is, for example, an airplane, a rocket, a space shuttle, and a spacecraft, etc., and the electric toys include, for example, fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and the electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0086] The battery described in the present application is not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are all described using electric vehicles as examples.

[0087] Figure 1It is a simple schematic diagram of a vehicle 1 of the present embodiment. 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 battery 11 can be arranged inside the vehicle 1. For example, the battery 11 can be arranged at the bottom, the front or the rear of the vehicle 1. The battery 11 can be used to power the vehicle 1. For example, the battery can be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 12 and a motor 13. The controller 12 is used, for example, to control the battery 11 to power the motor 13. The battery 11 can be used for starting and navigating the vehicle 1. Of course, the battery 11 can also be used to drive the vehicle 1 to travel, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0088] The battery 11 mentioned in this embodiment can be as follows Figure 2 The battery module shown or Figure 3 As shown in the battery pack, the basic structural unit of the battery module and the battery pack is a battery cell, and multiple battery cells can be connected in series and / or in parallel via electrode terminals to be applied to various electrical devices. Among them, the battery module is to protect the battery cell from external impact, heat, vibration, etc. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame. The battery pack is the final state of the battery system installed in the electric vehicle. Most of the current battery packs are made by assembling various control and protection systems such as battery management systems and thermal management components on one or more battery modules. With the development of technology, the battery module level can be omitted, that is, the battery pack is directly formed by battery cells. This improvement has improved the weight energy density and volume energy density of the battery system while significantly reducing the number of components.

[0089] like Figures 2 to 6 As shown, the battery 11 of the present application includes: a first battery cell 111 and a second battery cell 112, the energy density of the first battery cell 111 is greater than the energy density of the second battery cell 112, the first battery cell 111 includes a first pressure relief mechanism 1111, the first pressure relief mechanism 1111 is used to actuate to release the internal pressure of the first battery cell 111 when the internal pressure or temperature of the first battery cell 111 reaches a threshold value, the second battery cell 112 includes a second pressure relief mechanism 1121, the second pressure relief mechanism 1121 is used to actuate to release the internal pressure of the second battery cell 112 when the internal pressure or temperature of the second battery cell 112 reaches a threshold value, and the area of ​​the first pressure relief mechanism 1111 is greater than the area of ​​the second pressure relief mechanism 1121.

[0090] The first pressure relief mechanism 1111 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 first battery cell 111 reaches a predetermined threshold. The first pressure relief mechanism 1111 can specifically take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the first battery cell 111 reaches a predetermined threshold, the first pressure relief mechanism 1111 performs an action or a weak structure provided in the first pressure relief mechanism 1111 is destroyed, thereby forming an opening or channel for internal pressure relief.

[0091] It can be understood that the second pressure relief mechanism 1121 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 second battery cell 112 reaches a predetermined threshold. The second pressure relief mechanism 1121 can specifically take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the second battery cell 112 reaches a predetermined threshold, the second pressure relief mechanism 1121 performs an action or a weak structure provided in the second pressure relief mechanism 1121 is destroyed, thereby forming an opening or channel for internal pressure relief.

[0092] The threshold referred to in the present application may be a pressure threshold or a temperature threshold, and the design of the threshold may vary according to different design requirements. For example, the threshold may be designed or determined based on the internal pressure or internal temperature value of the first battery cell 111 that is considered to be dangerous or at risk of loss of control, and the threshold may, for example, depend on one or more of the materials used in the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the first battery cell 111; for another example, the threshold may be designed or determined based on the internal pressure or internal temperature value of the second battery cell 112 that is considered to be dangerous or at risk of loss of control, and the threshold may, for example, depend on one or more of the materials used in the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the second battery cell 112.

[0093] The "actuation" mentioned in this application means that the first pressure relief mechanism 1111 is in motion or activated to a certain state, so that the internal pressure of the first battery cell 111 can be released, and the second pressure relief mechanism 1121 is in motion or activated to a certain state, so that the internal pressure of the second battery cell 112 can be released. The action of the first pressure relief mechanism 1111 may include but is not limited to: at least a part of the first pressure relief mechanism 1111 is broken, shattered, torn or opened, etc. When the first pressure relief mechanism 1111 is actuated, the high-temperature and high-pressure substances inside the first battery cell 111 will be discharged from the actuated part as emissions. In this way, the first battery cell 111 can be depressurized under controllable pressure or temperature, thereby avoiding potential more serious accidents. The emissions from the first battery cell 111 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 first pressure relief mechanism 1111 of the first battery cell 111, and can be more specifically discharged in the direction of the area where the first pressure relief mechanism 1111 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. Similarly, the actions produced by the second pressure relief mechanism 1121 may include but are not limited to: at least a portion of the second pressure relief mechanism 1121 is broken, shattered, torn or opened, etc. When the second pressure relief mechanism 1121 is actuated, the high-temperature and high-pressure substances inside the second battery cell 112 will be discharged from the actuated part as emissions. In this way, the second battery cell 112 can be depressurized under controllable pressure or temperature, thereby avoiding potential more serious accidents. The emissions from the second battery cell 112 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 produced by the reaction, flames, and the like. The high-temperature and high-pressure emissions are discharged toward the direction of the second pressure relief mechanism 1121 of the second battery cell 112, and can be more specifically discharged in the direction of the area where the second pressure relief mechanism 1121 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 that direction.

[0094] The first battery cell 111 and the second battery cell 112 in the present application can be lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. The first battery cell 111 and the second battery cell 112 can be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. The first battery cell 111 and the second battery cell 112 are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0095] like Figures 7 to 10As shown, the first battery cell 111 generally includes an electrode assembly (not shown) and an electrolyte (not shown), the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator arranged between the positive electrode sheet and the negative electrode sheet, and the first battery cell 111 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, and the current collector not coated with the positive electrode active material layer serves as a positive electrode ear. 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. 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 is multiple and stacked together, and the number of negative electrode tabs 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 may be a winding structure or a laminated structure, and the number of electrode assemblies may be one or more, and the embodiments of the present application do not impose specific restrictions on this. The first battery cell 111 also includes a shell 1114, in which the electrode assembly and the electrolyte are both encapsulated. The shell 1114 may be a hollow cuboid, cube or cylinder, and the material of the shell 1114 may be aluminum or steel and its alloy, or a plastic material or an aluminum-plastic film. The shell 1114 is also provided with a positive electrode terminal 1112 and a negative electrode terminal 1113, the positive electrode tab is electrically connected to the positive electrode terminal 1112, and the negative electrode tab is electrically connected to the negative electrode terminal 1113, so as to output electrical energy. The shell 1114 is also provided with the above-mentioned first pressure relief mechanism 1111. The first pressure relief mechanism 1111 can be set at any position of the shell 1114. For example, the first pressure relief mechanism 1111 can be set at the top, bottom or side of the shell 1114. The first pressure relief mechanism 1111 can also be set between the positive electrode terminal 1112 and the negative electrode terminal 1113. The present application does not make any specific restrictions on this, as long as the internal pressure of the first battery cell 111 can be released.

[0096] It can be understood that the structure of the second battery cell 112 is the same as that of the first battery cell 111 , and will not be described in detail herein.

[0097] In some embodiments, the ratio of the energy density E1 of the first battery cell 111 to the energy density E2 of the second battery cell 112 satisfies: 1.26≤E1 / E2≤2.14, wherein energy density refers to the energy released by the battery per unit mass or unit volume, i.e., weight energy density or volume energy density. In some embodiments, the first battery cell 111 is, for example, a ternary lithium battery, specifically, a nickel cobalt manganese oxide battery or a nickel cobalt aluminum oxide battery, and the second battery cell 112 is, for example, a lithium iron phosphate battery or a lithium cobalt oxide battery. It is worth noting that the energy density of the first battery cell 111 is greater than the energy density of the second battery cell 112. Generally, the thermal failure reaction of the first battery cell 111 is more severe than the failure reaction of the second battery cell 112. The simultaneous provision of the first battery cell 111 and the second battery cell 112 is conducive to reducing the chain reaction of thermal failure, that is, it is conducive to slowing down the spread of heat diffusion, and further improving the safety of the battery 11.

[0098] In some embodiments, the ratio of the area A1 of the first pressure relief mechanism 1111 to the area A2 of the second pressure relief mechanism 1121 satisfies: 1.5≤A1 / A2≤4, so that the first battery cell 111 and the second battery cell 112 can release energy in a timely and effective manner, thereby improving the safety of battery use.

[0099] The battery 11 provided in the embodiment of the present application has a first pressure relief mechanism 1111 disposed on the first battery cell 111, so that when the internal pressure or temperature of the first battery cell 111 reaches a threshold value, the first battery cell 111 can release the internal pressure; a second pressure relief mechanism 1121 is disposed on the second battery cell 112, so that when the internal pressure or temperature of the second battery cell 112 reaches a threshold value, the second battery cell 112 can also release the internal pressure; the energy density of the first battery cell 111 is greater than the energy density of the second battery cell 112, and the failure reaction of the first battery cell 111 due to thermal failure is more severe than the failure reaction of the second battery cell 112 due to thermal failure, and by limiting the area of ​​the first pressure relief mechanism 1111 to be greater than the area of ​​the second pressure relief mechanism 1121, the first battery cell 111 with a more severe failure reaction can release the pressure in a timely and effective manner through the first pressure relief mechanism 1111 with a larger area, thereby effectively reducing the probability of a chain reaction caused by the failure of the first battery cell 111 to release the internal pressure in a timely manner, thereby improving the overall safety of the battery 11.

[0100] In the battery 11 of this embodiment, the first battery cells 111 and the second battery cells 112 are alternately arranged in an arrangement of n first battery cells 111 and m second battery cells 112 , where n≥1, m≥1, and n and m are both integers.

[0101] The values ​​of n and m may be the same or different. For example, in some embodiments, Figure 2 , Figure 4 and Figure 5 As shown, the values ​​of n and m are both 1, that is, n=1, m=1. At this time, the first battery cells 111 and the second battery cells 112 are arranged in a row or a column one by one, that is, one second battery cell 112 is arranged between two adjacent first battery cells 111, and one first battery cell 111 is arranged between two adjacent second battery cells 112; for another example, in some embodiments, such as Figure 3 As shown, the values ​​of n and m are both 6, that is, n=6, m=6. At this time, six first battery cells 111 and six second battery cells 112 form an arrangement unit. There are three arrangement units, and the arrangement direction of the three arrangement units is along Figure 3 The Y-axis direction is shown, and the six first battery cells 111 and the six second battery cells 112 in each arrangement unit are arranged along Figure 3 The arrangement is shown in the X direction, and in two adjacent arrangement units, the first battery unit 111 and the second battery unit 112 are arranged staggered with each other; for example, in some other embodiments, Fig.11 As shown, the value of n is 2, the value of m is 2, that is, n=2, m=2, at this time, the first battery cells 111 and the second battery cells 112 are arranged in a row or a column with two first battery cells 111 and two second battery cells 112 spaced apart in pairs, that is, the arrangement units composed of two first battery cells 111 and two second battery cells 112 are arranged cyclically along a row or a column. It can be understood that the value of n and the value of m can also be other values, which are not enumerated here.

[0102] like Fig.11As shown, in the battery 11 of the present application, in some embodiments, a first thermal insulation member 114 is further provided between two adjacent first battery cells 111. When one of the first battery cells 111 fails thermally, the first thermal insulation member 114 can effectively prevent the first battery cell 111 adjacent to the first battery cell 111 that fails thermally from failing thermally. In some embodiments, a second thermal insulation member 115 is further provided between adjacent second battery cells 112. When one of the second battery cells 112 fails thermally, the second thermal insulation member 115 can effectively prevent the second battery cell 112 adjacent to the second battery cell 112 that fails thermally from failing thermally. In some embodiments, a third thermal insulation member 116 is further provided between adjacent first battery cells 111 and second battery cells 112. When one of the first battery cells 111 fails thermally, the third thermal insulation member 116 can effectively prevent the second battery cell 112 adjacent to the first battery cell 111 that fails thermally from failing thermally, and vice versa. In some embodiments, at least one of the first thermal insulation 114, the second thermal insulation 115, and the third thermal insulation 116 is included in the battery 11. In some embodiments, the first thermal insulation 114, the second thermal insulation 115, and the third thermal insulation 116 can be at least one of foam, rubber, thermal insulation cotton, and aerogel thermal insulation pads. In some embodiments, the first thermal insulation 114, the second thermal insulation 115, and the third thermal insulation 116 can be configured as a mouth frame structure, and further, the first thermal insulation 114, the second thermal insulation 115, and the third thermal insulation 116 also include a filler for filling the hollow part of the mouth frame, and the filler has elasticity, wherein the filler is selected from at least one of foam, rubber, thermal insulation cotton, and aerogel thermal insulation pads.

[0103] The battery 11 of the embodiment of the present application further includes a discharge channel 117, which is arranged opposite to the first pressure relief mechanism 1111 and / or the second pressure relief mechanism 1121, and the discharge channel 117 is configured to collect discharge from the first battery cell 111 when the first pressure relief mechanism 1111 is actuated, and / or to collect discharge from the second battery cell 112 when the second pressure relief mechanism 1121 is actuated. The provision of the discharge channel can release the pressure inside the first battery cell 111 and the second battery cell 112 in time when the internal pressure and temperature of the first battery cell 111 and the second battery cell 112 reach a threshold value, thereby making the battery 11 safer to use.

[0104] In some embodiments, the exhaust channel 117 is disposed opposite to the first pressure relief mechanism 1111, and the exhaust channel 117 is configured to collect exhaust from the first battery cell 111 when the first pressure relief mechanism 1111 is actuated. In some embodiments, the exhaust channel 117 is disposed opposite to the second pressure relief mechanism 1121, and the exhaust channel 117 is configured to collect exhaust from the second battery cell 112 when the second pressure relief mechanism 1121 is actuated. In other embodiments, Figure 4 and Figure 5 The discharge channel 117 is disposed opposite to the first pressure relief mechanism 1111 of the first battery cell 111 and the second pressure relief mechanism 1121 of the second battery cell 112. The discharge channel 117 is configured to collect discharges from the first battery cell 111 and the second battery cell 112 when the first pressure relief mechanism 1111 and the second pressure relief mechanism 1121 are actuated. Correspondingly, the first pressure relief mechanism 1111 of the first battery cell 111 is disposed in the manner as follows: Fig.13 The second pressure relief mechanism 1121 of the second battery cell 112 is also arranged at the middle position.

[0105] In such Fig.12 In the illustrated embodiment, at least two discharge channels 117 are provided, and each discharge channel 117 is isolated from each other. The first pressure relief mechanism 1111 and the second pressure relief mechanism 1121 are respectively arranged opposite to different discharge channels 117. Exemplarily, the first battery cell 111 and the second battery cell 112 are arranged in a row. The length and width of the first battery cell 111 and the second battery cell 112 may be substantially the same, and the thickness may be the same or different. The first pressure relief mechanism 1111 on the first battery cell 111 is one quarter of the width of the first battery cell 111 at one side thereof, and the second pressure relief mechanism 1121 on the second battery cell 112 is one quarter of the width of the second battery cell 112 at one side thereof. The first pressure relief mechanism 1111 and The second pressure relief mechanism 1121 is not arranged in a colinear manner, that is, the first pressure relief mechanism 1111 on the first battery cell 111 and the second pressure relief mechanism 1121 on the second battery cell 112 are alternately arranged in the arrangement direction of the first battery cell 111 and the second battery cell 112. In this way, when the internal pressure or temperature of the first battery cell 111 reaches a threshold value, the emission inside the first battery cell 111 is discharged from one of the emission channels 117, and when the internal pressure or temperature of the second battery cell 112 reaches a threshold value, the emission inside the second battery cell 112 is discharged from one of the emission channels 117, thereby making it possible for the emission of the first battery cell 111 and the second battery cell 112 to be discharged to the outside of the battery 11 in a timely and effective manner, thereby improving the safety of the battery 11.

[0106] Of course, in alternative implementations of the above implementations, if Fig.13 and Fig.14 As shown, the first pressure relief mechanism 1111 on the first battery cell 111 may be at a distance from one side edge thereof to half the width of the first battery cell 111, and the second pressure relief mechanism 1121 on the second battery cell 112 may be at a distance from one side edge thereof to one quarter the width of the second battery cell 112. At this time, the first pressure relief mechanism 1111 on the first battery cell 111 and the second pressure relief mechanism 1121 on the second battery cell 112 are not arranged in a colinear manner, that is, the first pressure relief mechanism 1111 on the first battery cell 111 and the second pressure relief mechanism 1121 on the second battery cell 112 are alternately arranged in the arrangement direction of the first battery cell 111 and the second battery cell 112.

[0107] In some embodiments, there are at least two first battery cells 111, and the first pressure relief mechanisms 1111 of two adjacent first battery cells 111 are respectively arranged relative to different emission channels 117. In this way, different first battery cells 111 can release emissions through different emission channels 117, respectively, so that the emissions of the first battery cells 111 are discharged to the outside of the battery 11 in a timely and effective manner. Moreover, the thermal failure of the first battery cell 111 can be effectively reduced to cause the thermal failure of the second battery cell 112, thereby cutting off the chain reaction and improving the safety of the battery 11.

[0108] In other embodiments, at least two second battery cells 112 are provided, and the second pressure relief mechanisms 1121 of two adjacent second battery cells 112 are respectively arranged relative to different discharge channels 117, so that different second battery cells 112 can release emissions through different discharge channels 117, respectively, so that the emissions of the second battery cells 112 are timely and effectively discharged to the outside of the battery 11, and the thermal failure of the second battery cells 112 that causes the thermal failure of the first battery cell 111 can be effectively reduced, thereby cutting off the chain reaction and improving the safety of the battery 11.

[0109] In some embodiments, Figure 5 and Fig.15As shown, the battery 11 also includes a box body 113, and the box body 113 has a plurality of walls, and the plurality of walls are used to enclose and form a receiving cavity for receiving the first battery cell 111 and the second battery cell 112, and at least one of the plurality of walls has a hollow inner cavity, and the hollow inner cavity is used to form a discharge channel 117. The box body 113 can be sealed or unsealed. For example, the box body 113 includes a top wall (not shown) located at the top, a bottom wall 1131 located at the bottom, and side walls 1132 located around the bottom wall 1131, and the top wall and the bottom wall 1131 are respectively covered at the openings at both ends of the side wall 1132, and then enclose together with the side wall 1132 to form a receiving cavity. Of course, the side wall 1132 can be formed by four sub-side walls connected end to end, or it can be an integral part. The box body 113 is used to protect the first battery cell 111 and the second battery cell 112 placed in the accommodating cavity, and a hollow inner cavity forming a discharge channel 117 is set in at least one of the multiple walls of the box body 113, which can facilitate the first pressure relief mechanism 1111 of the first battery cell 111 and the second pressure relief mechanism 1121 of the second battery cell 112 to be arranged relative to the corresponding hollow inner cavity, so that when the internal pressure or temperature of the first battery cell 111 reaches a threshold value, the emission of the first battery cell 111 can be discharged into the hollow inner cavity, and when the internal pressure or temperature of the second battery cell 112 reaches a threshold value, the emission of the second battery cell 112 can be discharged into the hollow inner cavity, thereby effectively reducing the risk of combustion and explosion and improving the safety of the battery 11.

[0110] Furthermore, the bottom wall 1131 is used to support the first battery cell 111 and the second battery cell 112, and the bottom wall 1131 has a hollow inner cavity. Correspondingly, the first pressure relief mechanism 1111 of the first battery cell 111 and the second pressure relief mechanism 1121 of the second battery cell 112 are both arranged at the bottom of their respective housings 1114. In this way, the discharge in the first battery cell 111 is released downward and enters the hollow inner cavity at the bottom through the first pressure relief mechanism 1111, and the discharge in the second battery cell 112 is released downward and enters the hollow inner cavity at the bottom through the second pressure relief mechanism 1121. This arrangement of the battery 11 allows the battery 11 to release discharge to the bottom of the vehicle 1 after being placed in the battery 11 compartment of the vehicle 1, rather than to the passenger compartment located above the battery 11 compartment, thereby further increasing the safety of the battery 11.

[0111] In some embodiments, in order to facilitate the timely and effective discharge of the exhaust of the first battery cell 111 and the second battery cell 112 into the exhaust channel 117, the first pressure relief mechanism 1111 of the first battery cell 111 and the second pressure relief mechanism 1121 of the second battery cell 112 are configured to be connected to the corresponding exhaust channel 117. The communication mode between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow inner cavity forming the exhaust channel 117 on the box body 113, and the communication mode between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow inner cavity forming the exhaust channel 117 on the box body 113 are described by the following two embodiments. It should be noted that the following two embodiments are only exemplary of two feasible embodiments, rather than limiting the communication mode between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow inner cavity, and the communication mode between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow inner cavity.

[0112] In one embodiment, at least one wall of the box 113 of the battery 11 is configured to be destroyed when the first pressure relief mechanism 1111 is actuated, so that the discharge from the first battery cell 111 passes through the at least one wall into the discharge channel 117. In other words, at least one wall of the box 113 is provided with a hollow inner cavity, which may be the top wall, the bottom wall 1131 or the side wall 1132 mentioned above, and the portion of the box 113 opposite to the first pressure relief mechanism 1111 of the first battery cell 111 has a complete wall surface in the first pressure relief mechanism 1111, that is, the portion of the box 113 opposite to the first pressure relief mechanism 1111 of the first battery cell 111 does not have a hole structure connected to the hollow inner cavity when the first pressure relief mechanism 1111 is not actuated. However, when the internal pressure or temperature of the first battery cell 111 reaches a threshold value, the first pressure relief mechanism 1111 of the first battery cell 111 is actuated, and the emissions inside the first battery cell 111 are released, the emissions released by the first battery cell 111 can act on at least one wall of the box body 113, so that the part of the box body 113 opposite to the pressure relief mechanism of the first battery cell 111 is destroyed (damaged or ruptured), so that the interior of the hollow inner cavity of the box body 113 is connected to the first pressure relief mechanism 1111, so that the emissions inside the first battery cell 111 can be discharged into the emission channel 117 in a timely and effective manner. Similarly, at least one wall of the box 113 of the battery 11 is configured to be destroyed when the second pressure relief mechanism 1121 is actuated so that emissions from the second battery cell 112 pass through at least one wall into the emission channel 117. The connection between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow channel is the same as the connection between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow channel, and will not be repeated here.

[0113] In another embodiment, at least one wall of the box body 113 of the battery 11 is provided with a first through hole 1133, which may be the top wall, bottom wall 1131 or side wall 1132 mentioned above. The first through hole 1133 is configured to be connected to the discharge channel 117 so that when the first pressure relief mechanism 1111 is actuated, the emissions from the first battery cell 111 enter the discharge channel 117 via the first through hole 1133. When the internal pressure or temperature of the first battery cell 111 reaches a threshold value, the pressure relief mechanism of the first battery cell 111 is actuated, and the emissions inside the first battery cell 111 are released, the emissions released by the first battery cell 111 enter the interior of the hollow inner cavity of the box body 113 through the first through hole 1133. In this way, the emissions inside the first battery cell 111 can be discharged into the discharge channel 117 in a timely and effective manner. Similarly, at least one wall of the box body 113 of the battery 11 is provided with a first through hole 1133, which may be the above-mentioned top wall, bottom wall 1131 or side wall 1132. The first through hole 1133 is configured to be connected to the discharge channel 117 so that when the second pressure relief mechanism 1121 is actuated, the discharge from the second battery cell enters the discharge channel 117 through the first through hole 1133. The connection mode between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow channel is the same as the connection mode between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow channel, and will not be repeated here.

[0114] The battery 11 also includes a thermal management component 118, which is used to contain a fluid to adjust the temperature of the first battery cell 111 and the second battery cell 112. The thermal management component 118 is disposed between the first battery cell 111 and the second battery cell 112 and at least one wall. By providing the thermal management component 118, the temperature of the first battery cell 111 and the second battery cell 112 can be adjusted, so that the first battery cell 111 and the second battery cell 112 can be charged and discharged more efficiently and safely. The fluid here can be a liquid or a gas, and adjusting the temperature means heating or cooling the first battery cell 111 and the second battery cell 112. In the case of cooling or lowering the temperature of the first battery cell 111 and the second battery cell 112, the thermal management component 118 is used to contain a cooling fluid to lower the temperature of the first battery cell 111 and the second battery cell 112. At this time, the thermal management component 118 can also be called a cooling component, a cooling system or a cooling plate, etc., and the fluid contained therein can also be called a cooling medium or a cooling fluid, and more specifically, it can be called a coolant or a cooling gas. In addition, the thermal management component 118 can also be used to contain a heating fluid to heat the battery cell 111, which is not limited in the present embodiment. Optionally, the fluid can be circulated to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air.

[0115] Among them, the thermal management component 118 is configured to be destroyed (damaged or ruptured) when the first pressure relief mechanism 1111 and / or the second pressure relief mechanism 1121 are actuated, so that the fluid flows out. That is, when the internal pressure or temperature of the first battery cell 111 and the second battery cell 112 reaches a threshold and needs to release high-temperature and high-pressure gas, the thermal management component 118 uses the emissions released by the first battery cell 111 and the second battery cell 112 to act on the thermal management component 118, thereby destroying the thermal management component 118, and the emissions of the first battery cell 111 and the second battery cell 112 can enter the exhaust channel 117 (i.e., the hollow inner cavity of the box body 113) through the destroyed thermal management component 118. And because the thermal management component 118 is destroyed, the outflowing fluid, such as coolant, absorbs a large amount of heat and gasifies, which can quickly reduce the temperature inside the battery 11, which is conducive to alleviating the chain reaction of thermal failure and improving the safety of the battery 11.

[0116] For example, Figure 5 and Fig.15As shown, the thermal management component 118 is, for example, a water cooling plate, in which a fluid channel is provided, one end of the fluid channel forms a water inlet, and the other end of the water flow channel forms a water outlet. When the first battery cell 111 and the second battery cell 112 work normally, the water temperature in the water cooling plate is adjusted, and then the ambient temperature of the first battery cell 111 and the second battery cell 112 is adjusted, so that the charging and discharging of the first battery cell 111 and the second battery cell 112 work within a reasonable temperature range, thereby improving the charging efficiency and discharging efficiency of the battery 11. When the first battery cell 111 fails thermally, or the second battery cell 112 fails thermally, or the first battery cell 111 and the second battery cell 112 fail thermally at the same time, the internal pressure released by the first battery cell 111 and the second battery cell 112 causes the water cooling plate to break, and then the water inside the water cooling plate is vaporized, and then the heat of the high-temperature gas released by the first battery cell 111 and the second battery cell 112 is absorbed, further reducing the probability of combustion and explosion of the first battery cell 111 and the second battery cell 112, thereby improving the safety of the battery 11. Optionally, the thermal management component 118 is provided with a second through hole 1181, and the second through hole 1181 is configured to be able to communicate with the exhaust channel 117, so that when the first pressure relief mechanism 1111 and / or the second pressure relief mechanism 1121 are actuated, the exhaust from the first battery cell 111 and / or the second battery cell 112 enters the corresponding exhaust channel 117 via the second through hole 1181. Optionally, the second through hole 1181 can be set to be greater than or equal to the area of ​​the first pressure relief mechanism 1111 provided on the first battery cell 111, and / or, greater than or equal to the area of ​​the second pressure relief mechanism 1121 provided on the second battery cell 112. In this way, when the internal pressure or temperature of the first battery cell 111 reaches a threshold value, the first pressure relief mechanism 1111 of the first battery cell 111 is actuated, and the exhaust inside the first battery cell 111 is released, the exhaust released by the first battery cell 111 can quickly and smoothly enter the exhaust passage 117 (i.e., the hollow inner cavity of the box body 113) through the second through hole 1181, so that the exhaust inside the first battery cell 111 can be timely and effectively discharged into the exhaust passage 117. Similarly, when the internal pressure or temperature of the second battery cell 112 reaches a threshold value, the second pressure relief mechanism 1121 of the second battery cell 112 is actuated, and the exhaust inside the second battery cell 112 is released, the exhaust released by the second battery cell 112 can quickly and smoothly enter the exhaust passage 117 (i.e., the hollow inner cavity of the box body 113) through the second through hole 1181, so that the exhaust inside the second battery cell 112 can be timely and effectively discharged into the exhaust passage 117.Further, when at least one wall of the box body 113 is provided with a first through hole 1133, and the first through hole 1133 is configured to communicate with the exhaust channel 117, at this time, the second through hole 1181 is communicated with the exhaust channel 117 via the first through hole 1133, and the emissions released by the first battery cell 111 and / or the second battery cell 112 enter the exhaust channel 117 (i.e., the hollow inner cavity of the box body 113) through the second through hole 1181 and the first through hole 1133 in sequence, so that the emissions inside the first battery cell 111 and the second battery cell 112 can be timely and effectively discharged into the exhaust channel 117. It is worth noting that in the above embodiment, the second through hole 1181 needs to correspond to the first through hole 1133 one by one, and illustratively, in the example. Fig.16 Two discharge passages 117 are provided on the bottom wall 1131. Fig.17 A plurality of first through holes 1133 communicating with the two discharge passages 117 are provided on the bottom wall 1131. Fig.18 The heat management component 118 is provided with a plurality of second through holes 1181 corresponding to the first through holes 1133. Fig.19 A discharge passage 117 is provided on the bottom wall 1131. Fig. 20 A plurality of first through holes 1133 connected to a discharge channel 117 are provided on the bottom wall 1131. Fig.21 The thermal management component 118 is provided with a plurality of second through holes 1181 corresponding to the first through holes 1133 one by one.

[0117] Combined with the above Figures 1 to 21 The battery 11 of the embodiment of the present application has been described. The preparation method and equipment of the battery 11 of the embodiment of the present application will be described below. For the parts not described in detail, please refer to the aforementioned embodiments.

[0118] This embodiment provides a method for preparing a battery, which includes the following steps:

[0119] A first battery cell 111 is configured, wherein the first battery cell 111 includes a first pressure relief mechanism 1111, and the first pressure relief mechanism 1111 is used to be actuated to release the internal pressure of the first battery cell 111 when the internal pressure or temperature of the first battery cell 111 reaches a threshold value;

[0120] A second battery cell 112 is configured, the second battery cell 112 includes a second pressure relief mechanism 1121, and the second pressure relief mechanism 1121 is used to be actuated to release the internal pressure of the second battery cell 112 when the internal pressure or temperature of the second battery cell 112 reaches a threshold value;

[0121] The energy density of the first battery cell 111 is greater than the energy density of the second battery cell 112 , and the area of ​​the first pressure relief mechanism 1111 is greater than the area of ​​the second pressure relief mechanism 1121 .

[0122] The preparation method of the battery provided in the present embodiment configures a first battery cell 111 with a higher energy density and a second battery cell 112 with a lower energy density, and limits the first pressure relief mechanism 1111 of the first battery cell 111 and the second pressure relief mechanism 1121 with an area larger than that of the second battery cell 112. When the first battery cell 111 and the second battery cell 112 fail thermally, even if the failure reaction of the thermal failure of the first battery cell 111 is more severe than the failure reaction of the thermal failure of the second battery cell 112, the first battery cell 111 with a more severe failure reaction can release the pressure promptly and effectively through the first pressure relief mechanism 1111 with a larger area. At the same time, the second battery cell 112 can also release the pressure promptly and effectively through the second pressure relief mechanism 1121, thereby effectively alleviating the rapid temperature rise of the first battery cell 111, and further effectively reducing the probability of a chain reaction caused by the thermal failure of the first battery cell 111, thereby improving the overall safety of the battery 11.

[0123] The present application provides a battery manufacturing device, which includes:

[0124] A first battery cell configuration module, used to configure a first battery cell 111, wherein the first battery cell 111 includes a first pressure relief mechanism 1111, and the first pressure relief mechanism 1111 is used to be actuated to release the internal pressure of the first battery cell 111 when the internal pressure or temperature of the first battery cell 111 reaches a threshold value;

[0125] A second battery cell configuration module, used to configure the second battery cell 112, the second battery cell 112 includes a second pressure relief mechanism 1121, the second pressure relief mechanism 1121 is used to actuate to release the internal pressure of the second battery cell 112 when the internal pressure or temperature of the second battery cell 112 reaches a threshold value;

[0126] The energy density of the first battery cell 111 is greater than the energy density of the second battery cell 112 , and the area of ​​the first pressure relief mechanism 1111 is greater than the area of ​​the second pressure relief mechanism 1121 .

[0127] The battery preparation device provided in the present embodiment configures a first battery cell 111 with a higher energy density through a first battery cell configuration module, and configures a second battery cell 112 with a lower energy density through a second battery cell configuration module, and limits the first pressure relief mechanism 1111 of the configured first battery cell 111 and the second pressure relief mechanism 1121 with an area larger than that of the second battery cell 112. When the first battery cell 111 and the second battery cell 112 fail thermally, even if the failure reaction of the thermal failure of the first battery cell 111 is more severe than the failure reaction of the thermal failure of the second battery cell 112, the first battery cell 111 with a more severe failure reaction can release pressure in a timely and effective manner through the first pressure relief mechanism 1111 with a larger area. At the same time, the second battery cell 112 can also release pressure in a timely and effective manner through the second pressure relief mechanism 1121, thereby effectively alleviating the rapid temperature rise of the first battery cell 111, thereby effectively reducing the probability of a chain reaction caused by the thermal failure of the first battery cell 111, and improving the overall safety of the battery 11.

[0128] The battery preparation device provided in this embodiment can be applied to the battery preparation method in the above embodiment, that is, the battery preparation method in the above embodiment can be specifically implemented by using the battery preparation device of this embodiment.

[0129] In summary, the battery 11, device, battery preparation method and battery preparation device provided in the present application, by limiting the area of ​​the first pressure relief mechanism 1111 of the first battery cell 111 with higher energy density, is smaller than the area of ​​the second pressure relief mechanism 1121 of the second battery cell 112 with lower energy density, so that both the first battery cell 111 and the second battery cell 112 can release pressure in a timely and effective manner, thereby improving the overall safety of the battery 11.

[0130] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: a first battery cell, the first battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism being configured to be actuated to release the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold value; a second battery cell, the second battery cell comprising a second pressure relief mechanism, the second pressure relief mechanism being configured to be actuated to release the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value; Among them, the energy density of the first battery cell is greater than the energy density of the second battery cell, and the area of ​​the first pressure relief mechanism is greater than the area of ​​the second pressure relief mechanism, and the first battery cell and the second battery cell are alternately arranged in an arrangement of n first battery cells and m second battery cells, where n≥1 and m≥1.

2. The battery according to claim 1, characterized in that The ratio of the area A1 of the first pressure relief mechanism to the area A2 of the second pressure relief mechanism satisfies: 1.5≤A1 / A2≤4.

3. The battery according to claim 1, characterized in that The ratio of the energy density E1 of the first battery cell to the energy density E2 of the second battery cell satisfies: 1.26≤E1 / E2≤2.

14.

4. The battery according to any one of claims 1 to 3, characterized in that Also includes a discharge channel, the discharge channel is arranged opposite to the first pressure relief mechanism and / or the second pressure relief mechanism, and the discharge channel is configured to collect discharge from the first battery cell when the first pressure relief mechanism is actuated, and / or, Exhaust from the second battery cell is collected when the second pressure relief mechanism is actuated.

5. The battery according to claim 4, characterized in that The number of the exhaust passages is at least two, and the exhaust passages are isolated from each other. The first pressure relief mechanism and the second pressure relief mechanism are respectively arranged opposite to different exhaust passages.

6. The battery according to claim 4, characterized in that The first battery cells are provided with at least two, and the first pressure relief mechanisms of two adjacent first battery cells are respectively arranged opposite to different discharge channels; and / or, The number of the second battery cells is at least two, and the second pressure relief mechanisms of two adjacent second battery cells are respectively arranged opposite to different discharge channels.

7. The battery according to claim 4, characterized in that The battery further includes a box having a plurality of walls, wherein the plurality of walls are used to enclose a receiving cavity for receiving the first battery cell and the second battery cell, and at least one of the plurality of walls has a hollow inner cavity, and the hollow inner cavity is used to form the discharge channel.

8. The battery according to claim 7, characterized in that The plurality of walls include a bottom wall for supporting the first battery cell and the second battery cell, the bottom wall having the hollow inner cavity.

9. The battery according to claim 7, characterized in that The at least one wall is configured to be destroyed when the first pressure relief mechanism and / or the second pressure relief mechanism are actuated to allow exhaust from the first battery cell and / or the second battery cell to pass through the at least one wall into the corresponding exhaust channel.

10. The battery according to claim 7, characterized in that The at least one wall is provided with a first through hole configured to communicate with the exhaust passage so that exhaust from the first battery cell and / or the second battery cell enters the corresponding exhaust passage via the first through hole when the first battery cell and / or the second battery cell is actuated.

11. The battery according to claim 10, characterized in that The battery also includes a thermal management component for containing a fluid to regulate the temperature of the first battery cell and the second battery cell, the thermal management component being disposed between the first battery cell and the second battery cell and the at least one wall, and the thermal management component being configured to be destroyed when the first pressure relief mechanism and / or the second pressure relief mechanism is actuated to allow the fluid to flow out.

12. The battery according to claim 11, characterized in that The thermal management component is provided with a second through hole, which is configured to communicate with the exhaust channel so that when the first pressure relief mechanism and / or the second pressure relief mechanism are actuated, exhaust from the first battery cell and / or the second battery cell enters the corresponding exhaust channel via the second through hole.

13. The battery according to claim 12, characterized in that The second through hole communicates with the exhaust passage via the first through hole.

14. A device, characterized in that: A battery comprising any one of claims 1 to 13, wherein the battery is used to provide electrical energy.

15. A method for preparing a battery, characterized in that: The steps include: configuring a first battery cell, the first battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism being configured to be actuated to release the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold value; configuring a second battery cell, the second battery cell comprising a second pressure relief mechanism, the second pressure relief mechanism being configured to be actuated to release the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value; Among them, the energy density of the first battery cell is greater than the energy density of the second battery cell, and the area of ​​the first pressure relief mechanism is greater than the area of ​​the second pressure relief mechanism, and the first battery cell and the second battery cell are alternately arranged in an arrangement of n first battery cells and m second battery cells, where n≥1 and m≥1.

16. A battery manufacturing device, characterized in that: include: A first battery cell configuration module, configured to configure a first battery cell, the first battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism being configured to be actuated to release the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold value; A second battery cell configuration module, configured to configure a second battery cell, the second battery cell comprising a second pressure relief mechanism, the second pressure relief mechanism being configured to be actuated to release the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value; Among them, the energy density of the first battery cell is greater than the energy density of the second battery cell, and the area of ​​the first pressure relief mechanism is greater than the area of ​​the second pressure relief mechanism, and the first battery cell and the second battery cell are alternately arranged in an arrangement of n first battery cells and m second battery cells, where n≥1 and m≥1.

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