Battery, device, method for manufacturing battery, and manufacturing device

Abstract

The application discloses a battery, a device, a preparation method of the battery, and a preparation device of the battery, relates to the technical field of batteries, and aims to solve the technical problem of weak safety of a battery. The battery comprises a first battery monomer, a second battery monomer, and a first heat insulation piece. The second battery monomer is arranged adjacent to the first battery monomer, and the energy density of the second battery monomer is smaller than that of the first battery monomer. The first heat insulation piece is arranged between the first battery monomer and the second battery monomer. The device comprises the battery. The preparation method of the battery comprises the following steps: configuring the first battery monomer; configuring the second battery monomer; and configuring the first heat insulation piece. The preparation device of the battery comprises a first battery monomer configuration module, a second battery monomer configuration module, and a first heat insulation piece configuration module. The provided battery, device, preparation method of the battery, and preparation device of the battery 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 device for preparing a battery. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles. In addition to improving battery performance, safety is also a crucial issue in the development of battery technology. If battery safety cannot be guaranteed, the battery is unusable. Therefore, enhancing battery safety is a pressing technical challenge 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 battery preparation device, so as 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;

[0007] a second battery cell, disposed adjacent to the first battery cell, and having an energy density lower than that of the first battery cell;

[0008] The first heat insulating member is arranged between the first battery cell and the second battery cell.

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

[0010] The battery provided in the embodiment of the present application includes a first battery cell and a second battery cell. The energy density of the second battery cell is lower than that of the first battery cell. The first battery cell has worse thermal stability than that of the second battery cell. The thermal failure reaction of the first battery cell is more intense than that of the second battery cell. When the first battery cell fails thermally, the first battery cell generates high-temperature gas, and the temperature of the first battery cell itself rises sharply. However, since a first thermal insulation member is provided between the first battery cell and the second battery cell, the first thermal insulation member can effectively delay or block the heat transfer between the first battery cell and the second battery cell, thereby effectively reducing the probability of the first battery cell triggering a chain reaction in the second battery cell, thereby improving the safety of battery use.

[0011] In some embodiments, the first thermal insulator includes a hollow portion that extends through the thickness of the first thermal insulator and is configured to provide space for expansion of the first and / or second battery cells. This allows the first or second battery cells to expand when the cells expand, allowing the excess volume to be filled within the hollow portion, thereby effectively buffering the expansion force of the battery.

[0012] In some embodiments, the first thermal insulation member is constructed as a U-shaped frame structure, so that the hollow portion can be easily prepared.

[0013] In some embodiments, the first thermal insulation member also includes a filling member for filling the hollow portion, and the filling member is elastic. In this way, when the first battery cell and the second battery cell do not suffer thermal failure, the first battery cell and the second battery cell can be reliably fixed, and when the first battery cell and the second battery cell suffer thermal failure, space for expansion and deformation is provided for the first battery cell and the second battery cell.

[0014] In some embodiments, the filler is selected from at least one of foam, rubber, thermal insulation cotton, and aerogel thermal insulation pads. A variety of filler materials are provided, and the filler can be selected based on the specific types of the first and second battery cells, thereby ensuring that the filler meets usage and safety requirements.

[0015] 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 is in the range of 1.26≤E1 / E2≤2.14. In this way, the battery capacity can be improved while ensuring the safety of the battery.

[0016] In some embodiments, the first and second battery cells are arranged alternately in a pattern of n first battery cells and m second battery cells, where n ≥ 1 and m ≥ 1. Thus, spacing the first and second battery cells, which have different energy densities, helps mitigate the spread of heat diffusion and thereby improve battery safety.

[0017] In some embodiments, at least two first battery cells are provided, and a second thermal insulator is disposed between two adjacent first battery cells. The second thermal insulator can effectively delay or block heat transfer between a first battery cell and its adjacent first battery cell, thereby effectively reducing the probability of a first battery cell triggering a chain reaction with its adjacent first battery cell, thereby improving the safety of the battery.

[0018] In some embodiments, at least two second battery cells are provided, and a third thermal insulator is disposed between two adjacent second battery cells. The third thermal insulator can effectively delay or block heat transfer between a second battery cell and its adjacent second battery cell, thereby effectively reducing the probability of a second battery cell triggering a chain reaction with its adjacent second battery cell, thereby improving the safety of the battery.

[0019] In some embodiments, a first pressure relief mechanism is provided on the first battery cell, and the first pressure relief mechanism is used to actuate to release its internal pressure when the internal pressure or temperature of the first battery cell reaches a threshold value; a second pressure relief mechanism is provided on the second battery cell, and the second pressure relief mechanism is used to actuate to release its internal pressure when the internal pressure or temperature of the second battery cell reaches a threshold value; the area of ​​the first pressure relief mechanism is larger than the area of ​​the second pressure relief mechanism. A first pressure relief mechanism is provided 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; a 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 the thermal failure of the first battery cell is more severe than the failure reaction of the 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.

[0020] In some embodiments, the battery further includes a drain channel, which is disposed opposite the first pressure relief mechanism and / or the second pressure relief mechanism, and is configured to collect emissions from the first battery cell when the first pressure relief mechanism is activated, and / or to collect emissions from the second battery cell when the second pressure relief mechanism is activated. Providing the drain channel allows for timely release of pressure within the first battery cell and / or the second battery cell when the internal pressure or temperature reaches a threshold, thereby making the battery safer to use.

[0021] In some embodiments, there are at least two discharge channels, each of which is isolated from each other, and the first pressure relief mechanism and the second pressure relief mechanism are respectively arranged relative 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.

[0022] In some embodiments, at least two first battery cells are provided, and the first pressure relief mechanisms of two adjacent first battery cells are disposed opposite different exhaust channels. This allows different first battery cells to release emissions through different exhaust channels, thereby enabling the emissions from the first battery cells to be promptly and effectively discharged to the exterior of the battery. Furthermore, the probability of thermal failure of a first battery cell leading to thermal failure of an adjacent first battery cell can be effectively reduced, thereby mitigating the chain reaction of thermal failure and improving battery safety.

[0023] In some embodiments, at least two second battery cells are provided, and the second pressure relief mechanisms of two adjacent second battery cells are disposed opposite different exhaust channels. This allows different second battery cells to release emissions through different exhaust channels, thereby allowing emissions from the second battery cells to be promptly and effectively discharged to the exterior of the battery. Furthermore, the probability of thermal failure of a second battery cell leading to thermal failure of an adjacent second battery cell can be effectively reduced, thereby mitigating the chain reaction of thermal failure and improving battery safety.

[0024] In some embodiments, the battery further includes a housing having multiple walls that enclose a chamber for accommodating the first and second battery cells, with at least one of the multiple walls having a hollow interior that forms a discharge passage. The housing is used to protect the first and second battery cells placed within the chamber, and the hollow interior that forms the discharge passage is provided in at least one of the multiple walls of the housing. This allows emissions from the first and second battery cells to be discharged into the hollow interior when the internal pressure or temperature of the first and second battery cells reaches a threshold. In this way, emissions from thermal failure of the first and second battery cells can be promptly and effectively discharged to the exterior of the battery, thereby improving the safety of the battery.

[0025] In some embodiments, the multiple walls include a bottom wall, which is used to support the first battery cell and the second battery cell, and has a hollow inner cavity. In this way, the exhaust from the first battery cell is released downward and enters the hollow inner cavity at the bottom through the pressure relief mechanism. Simultaneously, the exhaust from the second battery cell is released downward and enters the hollow inner cavity at the bottom through the second pressure relief mechanism. This arrangement of the batteries allows the batteries to release exhaust toward the bottom of the vehicle after being placed in the battery compartment of the vehicle, rather than into the passenger compartment above the battery compartment, thereby further improving the safety of the batteries.

[0026] 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 emissions from the first battery cell and / or the second battery cell pass through the at least one wall and enter the corresponding exhaust channel. Thus, when the internal pressure or temperature of the first battery cell reaches a threshold, causing the first pressure relief mechanism of the first battery cell to be actuated and the emissions from the first battery cell to be released, and / or when the internal pressure or temperature of the second battery cell reaches a threshold, causing the second pressure relief mechanism of the second battery cell to be actuated and the emissions from the second battery cell to be released, the emissions released from the first battery cell and / or the second battery cell can act on at least one wall of the housing, causing the portion of the housing opposite to the first pressure relief mechanism and / or the portion of the housing opposite to the second pressure relief mechanism to be destroyed, thereby connecting the hollow interior of the housing to the first pressure relief mechanism and / or the second pressure relief mechanism, thereby enabling the emissions from the first battery cell and / or the second battery cell to be promptly and effectively discharged into the exhaust channel, thereby further improving the safety of the battery.

[0027] In some embodiments, at least one wall is provided with a first through-hole, which is configured to communicate with a discharge channel so that when the first battery cell and / or the second battery cell are actuated, emissions from the first battery cell and / or the second battery cell enter the corresponding discharge channel via the first through-hole. 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 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 discharge channel in a timely and effective manner, thereby further improving the safety of the battery.

[0028] In some embodiments, the battery further includes a thermal management component for containing a fluid to regulate the temperature of the first and second battery cells. The thermal management component is disposed between the first and second battery cells and at least one wall, and is configured to be destroyed when the first and / or second pressure relief mechanisms are actuated, thereby allowing the fluid to flow out. In this manner, emissions from the first and / or second battery cells can enter the exhaust channel through the destroyed thermal management component. Furthermore, the destruction of the thermal management component allows the fluid to flow out, thereby rapidly reducing the internal temperature of the battery through the fluid, thereby mitigating the chain reaction of thermal failure and improving the safety of the battery.

[0029] In some embodiments, the thermal management component is provided with a second through-hole configured to communicate with the exhaust passage. When the first and / or second pressure relief mechanisms are activated, exhaust from the first and / or second battery cells enters the corresponding exhaust passage through the second through-hole. This allows exhaust from the first and / or second battery cells to quickly and smoothly enter the exhaust passage through the second through-hole, improving battery safety.

[0030] In some embodiments, the second through hole is connected to the exhaust passage via the first through hole. In this way, the exhaust 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 passage, thereby improving the safety of the battery.

[0031] A second aspect of an embodiment of the present application provides a device comprising the above-mentioned battery, which is used to provide electrical energy.

[0032] The device of the present application utilizes the above-mentioned battery to provide electrical energy, so that the first thermal insulation component can effectively delay or block the heat transfer between the first battery cell and the second battery cell, thereby effectively reducing the probability of the first battery cell triggering a chain reaction in the second battery cell, thereby improving the safety of battery use.

[0033] A third aspect of the embodiments of the present application provides a method for preparing a battery, comprising the following steps:

[0034] configuring a first battery cell;

[0035] configuring a second battery cell to be disposed adjacent to the first battery cell, wherein the energy density of the second battery cell is less than that of the first battery cell;

[0036] The first thermal insulation member is configured to be disposed between the first battery cell and the second battery cell.

[0037] The preparation method of the battery provided in this embodiment is to configure a first battery cell with a higher energy density and a second battery cell with a lower energy density, and configure a first thermal insulation member between the adjacent first battery cell and the second battery cell. In this way, even if the thermal stability of the first battery cell is worse and the thermal failure reaction of the first battery cell is more severe than the thermal failure reaction of the second battery cell, when the first battery cell fails thermally, the heat transfer between the first battery cell and the second battery cell can be effectively delayed or blocked by the configured first thermal insulation member, thereby effectively reducing the probability of the first battery cell triggering a chain reaction in the second battery cell, thereby improving the safety of battery use.

[0038] A fourth aspect of the embodiments of the present application provides a battery manufacturing device, comprising:

[0039] A first battery cell configuration module, configured to configure a first battery cell;

[0040] A second battery cell configuration module is used to configure a second battery cell to be disposed adjacent to the first battery cell, wherein the energy density of the second battery cell is less than that of the first battery cell;

[0041] The first thermal insulation member configuration module is used to configure the first thermal insulation member so as to place the first thermal insulation member between the first battery cell and the second battery cell.

[0042] The battery preparation device of this embodiment configures the first battery cell through the first battery cell configuration module, configures the second battery cell through the second battery cell configuration module, and the configured second battery cell is arranged adjacent to the first battery cell, and the energy density of the second battery cell is smaller than that of the first battery cell. The first thermal insulation member is configured through the first thermal insulation member configuration module, and the configured first thermal insulation member is arranged between the first battery cell and the second battery cell. In this way, even if the thermal stability of the first battery cell is worse and the thermal failure reaction of the first battery cell is more severe than the thermal failure reaction of the second battery cell, when the first battery cell has thermal runaway, the first thermal insulation member can effectively delay or block the heat transfer between the first battery cell and the second battery cell, thereby effectively reducing the probability of the first battery cell triggering a chain reaction in the second battery cell, thereby improving the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the vehicle of the present application;

[0044] Figure 2 is a schematic structural diagram of a battery module according to an embodiment of the present application;

[0045] Figure 3 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

[0046] Figure 4 The explosion of the battery in the embodiment of the present application Figure 1 ;

[0047] Figure 5 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0048] Figure 6 This is a front view of a battery cell according to an embodiment of the present application;

[0049] Figure 7 is a right side view of a battery cell according to an embodiment of the present application;

[0050] Figure 8 is a top view of a battery cell according to an embodiment of the present application;

[0051] Figure 9 This is a schematic diagram of the structure of the battery in the embodiment of the present application Figure 1 ;

[0052] Figure 10 This is a schematic diagram of the structure of the battery in the embodiment of the present application Figure 2 ;

[0053] Figure 11 This is a schematic diagram of the structure of the battery in the embodiment of the present application Figure 3 ;

[0054] Figure 12a is a schematic structural diagram of a first battery cell according to an embodiment of the present application;

[0055] Figure 12b is a schematic structural diagram of a second battery cell in an embodiment of the present application;

[0056] Figure 13 The explosion of the battery in the embodiment of the present application Figure 2 ;

[0057] Figure 14 The explosion of the battery in the embodiment of the present application Figure 3 ;

[0058] Figure 15 This is a schematic diagram of the structure of the bottom wall of an embodiment of the present application Figure 1 ;

[0059] Figure 16 This is a schematic diagram of the structure of the bottom wall of an embodiment of the present application Figure 2 ;

[0060] Figure 17 is a schematic structural diagram of a thermal management component according to an embodiment of the present application;

[0061] Figure 18 This is a schematic diagram of the structure of the bottom wall of another embodiment of the present application Figure 1 ;

[0062] Figure 19 This is a schematic diagram of the structure of the bottom wall of another embodiment of the present application Figure 2 ;

[0063] Figure 20 It is a structural schematic diagram of a thermal management component of another embodiment of the present application.

[0064] Reference numerals:

[0065] 1- Vehicle;

[0066] 11-Battery;

[0067] 111 - first battery cell;

[0068] 1111-first pressure relief mechanism;

[0069] 1112-positive electrode terminal;

[0070] 1113-negative electrode terminal;

[0071] 1114-housing;

[0072] 112 - second battery cell;

[0073] 1121: Second pressure relief mechanism;

[0074] 113- box;

[0075] 1131-bottom wall;

[0076] 1132-side wall;

[0077] 1133-first through hole;

[0078] 114- first thermal insulation member;

[0079] 1141-hollow part;

[0080] 115 - second thermal insulation member;

[0081] 116 - third thermal insulation member;

[0082] 117-discharge channel;

[0083] 118-thermal management components;

[0084] 1181-second through hole;

[0085] 12-controller;

[0086] 13-Motor. DETAILED DESCRIPTION

[0087] A 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.

[0088] An existing type of battery includes a housing and a plurality of battery cells disposed within the housing, wherein the plurality of battery cells are connected in series and / or in parallel, wherein 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.

[0089] However, the inventors of this application have discovered that the thermal stability of the first battery cell is weaker than that of the second battery cell. When thermal failure occurs, the failure reaction of the first battery cell will be more severe than the failure reaction 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. This can easily trigger a chain reaction, causing heat spread, increasing the risk of combustion and explosion, and causing problems in battery safety.

[0090] In order to solve the problem that the first battery cell triggers a chain reaction, causes heat spread, increases the risk of combustion and explosion, and causes battery safety problems, the present application provides a battery, a device, a battery preparation method and a battery preparation device, by arranging a first thermal insulation member between adjacent first battery cells and second battery cells, thereby effectively delaying or blocking the heat transfer between the first battery cell and the second battery cell. In this way, when the first battery cell fails thermally, the first thermal insulation member can prevent the heat of the first battery cell from being transferred to the second battery cell, effectively reducing the probability of a chain reaction caused by the second battery cell absorbing the heat generated by the thermal failure of the first battery cell, thereby improving the safety of the entire battery.

[0091] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 clearly understood. 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 are within the scope of protection of this application.

[0092] An embodiment of the present application provides a device and a battery. The device provided by the present application includes a battery, which 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. The electric tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0093] The battery described in this application is not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0094] Figure 1This 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 provided inside the vehicle 1. For example, the battery 11 can be provided at the bottom, front or 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 can 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.

[0095] The battery 11 mentioned in this embodiment can be Figure 2 The battery module shown or Figure 3 The battery pack shown, etc., the basic structural unit of the battery module and the battery pack is the battery cell. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for application in various electrical devices. Among them, the battery module is to protect the battery cells 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 from 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.

[0096] like Figure 4 As shown, the battery 11 of the present application includes: a first battery cell 111, a second battery cell 112 and a first thermal insulation member 114. The second battery cell 112 is arranged adjacent to the first battery cell 111. The energy density of the first battery cell 111 is greater than the energy density of the second battery cell 112. The first thermal insulation member 114 is arranged between the first battery cell 111 and the second battery cell 112.

[0097] The first battery cell 111 and the second battery cell 112 in this application can be 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., and the embodiments of this 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 this 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, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0098] like Figures 5 to 8 As 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 disposed between the positive and negative electrode sheets. The first battery cell 111 primarily relies on the movement of metal ions between the positive and negative electrode sheets to operate. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector not coated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector not coated with the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive 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. 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 can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can pass through without 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 can be polypropylene (abbreviated as PP) or polyethylene (abbreviated as PE), etc. In addition, the electrode assembly can be a wound structure or a laminated structure, and the number of electrode assemblies can 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 housing 1114, which encapsulates the electrode assembly and electrolyte. Housing 1114 can be a hollow cuboid, cube, or cylinder, and can be made of aluminum, steel, or alloys thereof, plastic, or aluminum-plastic film. Housing 1114 also includes 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, for electrical energy output.

[0099] 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 here.

[0100] The battery 11 provided in the embodiment of the present application includes a first battery cell 111 and a second battery cell 112. The energy density of the second battery cell 112 is lower than that of the first battery cell 111. The first battery cell 111 has worse thermal stability than the second battery cell 112. The thermal failure reaction of the first battery cell 111 is more intense than the thermal failure reaction of the second battery cell 112. When the first battery cell 111 undergoes thermal runaway, the first battery cell 111 generates high-temperature gas, and the temperature of the first battery cell 111 itself rises sharply. However, since a first thermal insulation member 114 is provided between the first battery cell 111 and the second battery cell 112, the first thermal insulation member 114 can effectively delay or block the heat transfer between the first battery cell 111 and the second battery cell 112, thereby effectively reducing the probability of the first battery cell 111 triggering a chain reaction in the second battery cell 112, thereby improving the safety of battery use.

[0101] It is worth noting that since the thermal stability of the first battery cell 111 is worse than that of the second battery cell 112, the first battery cell 111 usually fails thermally first. At this time, the first thermal insulation member 114 can block the heat generated by the thermal failure of the first battery cell 111 from being transferred to the second battery cell 112, thereby reducing the probability that the first battery cell 111 will trigger a chain reaction in the second battery cell 112. However, this does not mean that the first battery cell 111 will definitely fail thermally before the second battery cell 112. When the external force only acts on the second battery cell 112, the second battery cell 112 may fail thermally first. At this time, the first thermal insulation member 114 can also block the heat generated by the thermal failure of the second battery cell 112 from being transferred to the first battery cell 111, thereby reducing the probability that the second battery cell 112 will trigger a chain reaction in the first battery cell 111. Here, since the first battery cell 111 is usually more likely to fail thermally first, and for the convenience of brief description, it is described as the first battery cell 111 failing thermally first.

[0102] In the battery of the present application, the first thermal insulator 114 includes a hollow portion 1141 that extends through the thickness of the first thermal insulator 114 and is configured to provide space for the first battery cell 111 and / or the second battery cell 112 to expand. Thus, when the first battery cell 111 or the second battery cell 112 expands, the excess volume of the expanded first battery cell 111 or the second battery cell 112 is filled in the hollow portion 1141, thereby effectively buffering the expansion force of the battery 11. In some embodiments, the first thermal insulator 114 is configured as a square frame structure, which facilitates the preparation of the hollow portion 1141 on the first thermal insulator 114. In other embodiments, the first thermal insulator 114 further includes a filler (not shown) to fill the hollow portion 1141. The filler is elastic and is selected from at least one of foam, rubber, thermal insulation cotton, and aerogel insulation pads. In this way, the material of the filler can be selected according to the specific types of the first battery cell 111 and the second battery cell 112 , as well as factors such as cost.

[0103] 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 both n and m are integers.

[0104] The values ​​of n and m can 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, that is, a second battery cell 112 is set between two adjacent first battery cells 111, and a first battery cell 111 is set between two adjacent second battery cells 112. For another example, in some embodiments, 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 staggered. For example, in other embodiments, as shown in FIG. Figure 4As shown, the value of n is 2, and the value of m is 2, that is, n=2, m=2. In this case, 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 unit consisting of two first battery cells 111 and two second battery cells 112 is arranged cyclically along a row or a column. It is understood that the values ​​of n and m can also be other values, which are not enumerated here.

[0105] In some embodiments, in the battery 11 of the present application, the number of first battery cells 111 is at least two, that is, when n≥2, a second thermal insulation member 115 is further provided between two adjacent first battery cells 111. The second thermal insulation member 115 can effectively delay or block the heat transfer between the first battery cell 111 and the first battery cell 111 adjacent thereto, thereby effectively reducing the probability that the first battery cell 111 triggers a chain reaction in the first battery cell 111 adjacent thereto, thereby improving the safety of the battery 11.

[0106] In other embodiments, in the battery 11 of the present application, the number of the second battery cells 112 is set to be at least two, that is, when m≥2, a third thermal insulation member 116 is further provided between adjacent second battery cells 112. The third thermal insulation member 116 can effectively delay or block the heat transfer between the second battery cell 112 and the second battery cell 112 adjacent thereto, thereby effectively reducing the probability that the second battery cell 112 triggers a chain reaction in the second battery cell 112 adjacent thereto, thereby improving the safety of the battery 11.

[0107] It is worth noting that, in some embodiments, the first thermal insulator 114 may be provided only between the first battery cell 111 and the second battery cell 112. In some embodiments, the first thermal insulator 114 may be provided between adjacent first battery cells 111 and second battery cells 112, while the second thermal insulator 115 may be provided between two adjacent first battery cells 111. In some embodiments, the first thermal insulator 114 may be provided between adjacent first battery cells 111 and second battery cells 112, while the third thermal insulator 116 may be provided between two adjacent second battery cells 112. In some embodiments, the second thermal insulator 115 may be provided between two adjacent first battery cells 111, the first thermal insulator 114 may be provided between adjacent first battery cells 111 and second battery cells 112, and the third thermal insulator 116 may be provided between adjacent second battery cells 112.

[0108] It is worth noting that the structures of the second thermal insulation member 115 and the third thermal insulation member 116 may be the same as or different from the first thermal insulation member 114. For example, in some embodiments, Figure 4 As shown, the first thermal insulation member 114 and the second thermal insulation member 115 are constructed into a U-shaped frame structure. Optionally, the first thermal insulation member 114 and the second thermal insulation member 115 further include a filler for filling the hollow portion. The filler is elastic and is selected from at least one of foam, rubber, thermal insulation cotton, and aerogel thermal insulation pad.

[0109] like Figure 9 As shown, the battery 11 of the present application, the first battery cell 111 also includes a first pressure relief mechanism 1111, which 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, and the second battery cell 112 also includes a second pressure relief mechanism 1121, which 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 larger than the area of ​​the second pressure relief mechanism 1121.

[0110] The first pressure relief mechanism 1111 refers to an element or component that can be activated 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 employ 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 activates or a weak structure within the first pressure relief mechanism 1111 is destroyed, thereby forming an opening or channel for internal pressure relief.

[0111] It is understood that the second pressure relief mechanism 1121 refers to an element or component that can be activated 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 adopt 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 is activated or a weak structure provided in the second pressure relief mechanism 1121 is destroyed, thereby forming an opening or channel for internal pressure relief.

[0112] The threshold referred to in this application may be a pressure threshold or a temperature threshold. The design of the threshold may vary depending on 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 the materials used for one or more of the positive electrode sheet, negative electrode sheet, 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 the materials used for one or more of the positive electrode sheet, negative electrode sheet, electrolyte and isolation membrane in the second battery cell 112.

[0113] As used herein, "activation" means that the first pressure relief mechanism 1111 is actuated or activated to a certain state, thereby releasing the internal pressure of the first battery cell 111, and the second pressure relief mechanism 1121 is actuated or activated to a certain state, thereby releasing the internal pressure of the second battery cell 112. The action of the first pressure relief mechanism 1111 may include, but is not limited to, rupturing, breaking, tearing, or opening at least a portion of the first pressure relief mechanism 1111. When the first pressure relief mechanism 1111 is actuated, high-temperature, high-pressure substances within the first battery cell 111 are discharged from the actuated portion as emissions. This allows pressure relief in the first battery cell 111 under controllable pressure or temperature, thereby avoiding potentially more serious accidents. Emissions from the first battery cell 111 as used herein include, but are not limited to, electrolyte, dissolved or split positive and negative electrode plates, separator fragments, high-temperature, high-pressure gases generated by the reaction, flames, and so on. High-temperature, high-pressure emissions are discharged toward the first pressure relief mechanism 1111 of the first battery cell 111, and more specifically, toward the area where the first pressure relief mechanism 1111 is actuated. The force and destructive power of these emissions can be significant, potentially even sufficient to rupture one or more components in that direction. Similarly, the actions produced by the second pressure relief mechanism 1121 may include, but are not limited to, rupturing, shattering, tearing, or opening at least a portion of the second pressure relief mechanism 1121. When the second pressure relief mechanism 1121 is actuated, the high-temperature, high-pressure substances within the second battery cell 112 are discharged from the actuated area as emissions. This method allows pressure relief in the second battery cell 112 under controllable pressure or temperature, thereby avoiding potentially more serious accidents. Emissions from the second battery cell 112 referred to in this application include, but are not limited to, electrolyte, dissolved or split positive and negative electrode plates, separator fragments, high-temperature, high-pressure gases generated 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 toward 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.

[0114] In the first battery cell 111, the first pressure relief mechanism 1111 can be provided at any position of the housing 1114. For example, the first pressure relief mechanism 1111 can be provided at the top, bottom, or side of the housing 1114. The first pressure relief mechanism 1111 can also be provided between the positive electrode terminal 1112 and the negative electrode terminal 1113. This application does not impose any specific restrictions on this, as long as the internal pressure of the first battery cell 111 can be released. Similarly, the second pressure relief mechanism 1121 provided on the second battery cell 112 can be similar to the second pressure relief mechanism 1111 provided on the first battery cell 111, and will not be described in detail here.

[0115] 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 the following: 1.26≤E1 / E2≤2.14, where energy density refers to the energy released per unit mass or unit volume of the battery, i.e., gravimetric energy density or volumetric energy density. In some embodiments, the first battery cell 111 is, for example, a ternary lithium battery, specifically, a lithium nickel cobalt manganese oxide battery or a lithium 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 1115 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 beneficial for reducing the chain reaction of thermal failure, that is, for mitigating the spread of heat diffusion, further improving the safety of the battery 11.

[0116] 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. In this way, both 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.

[0117] The battery 11 provided in the embodiment of the present application is provided with a first pressure relief mechanism 1111 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; and a second pressure relief mechanism 1121 is provided 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. By limiting the area of ​​the first pressure relief mechanism 1111 to be larger than the area of ​​the second pressure relief mechanism 1121, the first battery cell 111, which has 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.

[0118] like Figure 10 As shown, the battery 11 of the embodiment of the present application further includes a discharge channel 117. The discharge channel 117 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 emissions from the first battery cell 111 when the first pressure relief mechanism 1111 is actuated, and / or to collect emissions from the second battery cell 112 when the second pressure relief mechanism 1121 is actuated. The provision of the discharge channel can promptly release the pressure within the first battery cell 111 and / or the second battery cell 112 when the internal pressure and temperature of the first battery cell 111 and / or the second battery cell 112 reach a threshold value, thereby making the battery 11 safer to use.

[0119] 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 10 The exhaust channel 117 is arranged 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 exhaust channel 117 is configured to collect exhaust 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 arranged as follows: Figure 12aThe second pressure relief mechanism 1121 of the second battery cell 112 is also arranged at the center position.

[0120] In such Figure 11 In the embodiment shown, 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. For example, 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 can be substantially the same, and the thickness can 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 from 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 from one side thereof, and the first pressure relief mechanism 1111 and The second pressure relief mechanism 1121 is not collinearly arranged, 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 staggered 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 exhaust inside the first battery cell 111 is discharged from one of the exhaust channels 117. When the internal pressure or temperature of the second battery cell 112 reaches a threshold value, the exhaust inside the second battery cell 112 is discharged from one of the exhaust channels 117. As a result, the exhaust from the first battery cell 111 and the second battery cell 112 can be discharged to the outside of the battery 11 in a timely and effective manner, thereby improving the safety of the battery 11.

[0121] Of course, in alternative embodiments of the above embodiments, Figure 12a and Figure 12b As shown, the first pressure relief mechanism 1111 on the first battery cell 111 can be half the width of the first battery cell 111 away from one side edge thereof, and the second pressure relief mechanism 1121 on the second battery cell 112 can be one quarter the width of the second battery cell 112 away from one side edge thereof. 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 collinearly arranged, 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 staggered in the arrangement direction of the first battery cell 111 and the second battery cell 112.

[0122] 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 discharge channels 117. In this way, different first battery cells 111 can release emissions through different discharge 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 adjacent first battery cell 111, thereby alleviating the chain reaction and improving the safety of the battery 11.

[0123] In some embodiments, there are at least two second battery cells 112, and the second pressure relief mechanisms 1121 of two adjacent second battery cells 112 are respectively arranged relative to different discharge channels 117. In this way, 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 discharged to the outside of the battery 11 in a timely and effective manner. Moreover, the thermal failure of the second battery cell 112 can be effectively reduced to cause the thermal failure of the adjacent second battery cell 112, thereby alleviating the chain reaction and improving the safety of the battery 11.

[0124] In some embodiments, as Figure 13 and Figure 14As shown, the battery 11 also includes a box body 113, which has a plurality of walls, and the plurality of walls are used to enclose a receiving cavity for accommodating the first battery cell 111 and the second battery cell 112. 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) at the top, a bottom wall 1131 at the bottom, and an annular side wall 1132 located around the bottom wall 1131. 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 a one-piece piece. 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 provided 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 emissions 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 emissions 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.

[0125] Furthermore, the bottom wall 1131 is used to support the first battery cell 111 and the second battery cell 112. 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 shells 1114. In this way, the emissions in the first battery cell 111 are released downward and enter the hollow inner cavity at the bottom through the first pressure relief mechanism 1111. The emissions in the second battery cell 112 are released downward and enter 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 emissions to the bottom of the vehicle 1 after being placed in the battery compartment of the vehicle 1, rather than to the passenger compartment above the battery compartment, thereby further increasing the safety of the battery 11.

[0126] In some embodiments, to facilitate the timely and effective discharge of exhaust from the first battery cell 111 and the second battery cell 112 into the exhaust passage 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 communicate with the corresponding exhaust passage 117. The communication between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow inner cavity of the housing 113 forming the exhaust passage 117, and the communication between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow inner cavity of the housing 113 forming the exhaust passage 117, are described in the following two embodiments. It should be noted that the following two embodiments are merely exemplary of two feasible implementations and do not limit the communication between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow inner cavity, and the communication between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow inner cavity.

[0127] In one embodiment, at least one wall of the case 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 case 113 is provided with a hollow inner cavity, which may be the top wall, bottom wall 1131 or side wall 1132 mentioned above, and the portion of the case 113 opposite to the first pressure relief mechanism 1111 of the first battery cell 111 has a complete wall surface when the first pressure relief mechanism 1111 is not actuated, that is, the portion of the case 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 When the first pressure relief mechanism 1111 of the first battery cell 111 is activated and the exhaust from the first battery cell 111 is released, the exhaust from the first battery cell 111 can act on at least one wall of the housing 113, causing the portion of the housing 113 opposite the pressure relief mechanism of the first battery cell 111 to be damaged (broken or ruptured), thereby connecting the interior of the hollow interior of the housing 113 with the first pressure relief mechanism 1111. In this way, the exhaust from the first battery cell 111 can be promptly and effectively discharged into the exhaust passage 117. Similarly, at least one wall of the housing 113 of the battery 11 is configured to be damaged when the second pressure relief mechanism 1121 is activated, allowing the exhaust from the second battery cell 112 to pass through the at least one wall and enter the exhaust passage 117. This communication between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow interior is similar to that between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow interior, and will not be further described here.

[0128] In another embodiment, at least one wall of the case 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 communicate with 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 through the first through hole 1133. When the internal pressure and temperature of the first battery cell 111 reach 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 case 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 communicate with the discharge channel 117 so that when the second pressure relief mechanism 1121 is actuated, the discharge from the second battery cell 112 enters the discharge channel 117 through the first through hole 1133. This communication method between the second pressure relief mechanism 1121 of the second battery cell 112 and the hollow inner cavity is the same as the communication method between the first pressure relief mechanism 1111 of the first battery cell 111 and the hollow inner cavity, and will not be repeated here.

[0129] The battery 11 also includes a thermal management component 118 for containing a fluid to regulate the temperature of the first and second battery cells 111, 112. The thermal management component 118 is disposed between the first and second battery cells 111, 112 and at least one wall. The thermal management component 118 regulates the temperature of the first and second battery cells 111, 112, thereby enabling more efficient and safe charging and discharging of the first and second battery cells 111, 112. The fluid herein can be a liquid or a gas, and regulating the temperature refers to heating or cooling the first and second battery cells 111, 112. When cooling or lowering the temperature of the first and second battery cells 111, 112, the thermal management component 118 contains a cooling fluid to lower the temperature of the first and second battery cells 111, 112. In this case, the thermal management component 118 may also be referred to as a cooling component, cooling system, or cooling plate, and the fluid contained therein may also be referred to as a cooling medium or cooling fluid, more specifically, as a coolant or cooling gas. In addition, the thermal management component 118 may also be used to contain a heating fluid to increase the temperature of the battery cells 111, although this is not limited in this embodiment of the present application. Alternatively, the fluid may be circulated to achieve better temperature regulation. Alternatively, the fluid may be water, a mixture of water and ethylene glycol, or air.

[0130] The thermal management component 118 is configured to be destroyed (damaged or ruptured) upon activation of the first pressure relief mechanism 1111 and / or the second pressure relief mechanism 1121, allowing fluid to escape. Specifically, when the internal pressure or temperature of the first and second battery cells 111, 112 reaches a threshold and requires the release of high-temperature, high-pressure gas, the thermal management component 118 utilizes the emissions released by the first and second battery cells 111, 112 to act upon the thermal management component 118, thereby destroying the thermal management component 118. The emissions from the first and second battery cells 111, 112 are then able to pass through the destroyed thermal management component 118 and enter the exhaust channel 117 (i.e., the hollow interior of the housing 113). Furthermore, due to the destruction of the thermal management component 118, the escaping fluid, such as coolant, absorbs a large amount of heat and vaporizes, rapidly reducing the internal temperature of the battery 11, mitigating the chain reaction of thermal failure and improving the safety of the battery 11.

[0131] For example, Figure 13 and Figure 14 As shown, the thermal management component 118 is, for example, a water cooling plate. A fluid channel is provided in the water cooling plate. One end of the fluid channel forms a water inlet, and the other end of the water channel forms a water outlet. When the first battery cell 111 and the second battery cell 112 are operating normally, the ambient temperature of the first battery cell 111 and the second battery cell 112 is adjusted by adjusting the water temperature in the water cooling plate, thereby adjusting the ambient temperature of the first battery cell 111 and the second battery cell 112. This allows the first battery cell 111 and the second battery cell 112 to operate within a relatively reasonable temperature range, thereby improving the charging and discharging efficiency of the battery 11. When the first battery cell 111 or the second battery cell 112 thermally fails, or the first battery cell 111 and the second battery cell 112 thermally fail 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 rupture, thereby causing the water inside the water cooling plate to vaporize, thereby absorbing the heat of the high-temperature gas released by the first battery cell 111 and the second battery cell 112, further reducing the probability of combustion and explosion of the first battery cell 111 and the second battery cell 112, and improving the safety of the battery 11.

[0132] Optionally, the thermal management component 118 is provided with a second through hole 1181, which can be configured 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, 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 provided to have an area 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. Thus, when the internal pressure or temperature of the first battery cell 111 reaches a threshold, the first pressure relief mechanism 1111 of the first battery cell 111 is activated, and the exhaust from the first battery cell 111 is released. The exhaust released from the first battery cell 111 can quickly and smoothly enter the exhaust passage 117 (i.e., the hollow inner cavity of the housing 113) through the second through-hole 1181, thereby ensuring that the exhaust from the first battery cell 111 can be promptly and effectively discharged into the exhaust passage 117. Similarly, when the internal pressure or temperature of the second battery cell 112 reaches a threshold, the second pressure relief mechanism 1121 of the second battery cell 112 is activated, and the exhaust from the second battery cell 112 is released. The exhaust released from the second battery cell 112 can quickly and smoothly enter the exhaust passage 117 (i.e., the hollow inner cavity of the housing 113) through the second through-hole 1171, thereby ensuring that the exhaust from the second battery cell 112 can be promptly and effectively discharged into the exhaust passage 117.

[0133] Furthermore, 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 be connected to the exhaust channel 117, at this time, the second through hole 1181 is connected to 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 turn. In this way, the emissions inside the first battery cell 111 and the second battery cell 112 can be discharged into the exhaust channel 117 in a timely and effective manner.

[0134] 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. For example, Figure 15 Two discharge channels 112 are provided on the bottom wall 1131. Figure 16 The bottom wall 1131 is provided with a plurality of first through holes 1133 communicating with the two discharge channels 112. Figure 17 The heat management component 117 is provided with a plurality of second through holes 1171 corresponding to the first through holes 1133. Figure 18 A discharge passage 112 is provided on the bottom wall 1131. Figure 19 The bottom wall 1131 is provided with a plurality of first through holes 1133 connected to a discharge channel 112. Figure 20 The thermal management component 117 is provided with a plurality of second through holes 1171 corresponding one-to-one to the first through holes 1133 .

[0135] Combined with the above Figures 1 to 20 The battery 11 of the embodiment of the present application has been described. The preparation method and equipment of the battery of the embodiment of the present application will be described below. For the parts not described in detail, please refer to the aforementioned embodiments.

[0136] The present invention provides a method for preparing a battery, which includes the following steps:

[0137] Dispose a first battery cell 111;

[0138] The second battery cell 112 is configured to be disposed adjacent to the first battery cell 111 , and the energy density of the second battery cell 112 is lower than that of the first battery cell 111 ;

[0139] The first thermal insulation member 114 is configured to be disposed between the first battery cell 111 and the second battery cell 112 .

[0140] The preparation method of the battery provided in this embodiment is to configure a first battery cell 111 with higher energy density and a second battery cell 112 with lower energy density, and configure a first thermal insulation member 114 between the adjacent first battery cell 111 and the second battery cell 112. In this way, even if the thermal stability of the first battery cell 111 is worse and the thermal failure reaction of the first battery cell 111 is more intense than the thermal failure reaction of the second battery cell 112, when the first battery cell 111 fails thermally, the heat transfer between the first battery cell 111 and the second battery cell 112 can be effectively delayed or blocked by the configured first thermal insulation member 114, thereby effectively reducing the probability of the first battery cell 111 triggering a chain reaction in the second battery cell 112, thereby improving the safety of the battery 11.

[0141] A fourth aspect of the embodiments of the present application provides a battery manufacturing device, comprising:

[0142] A first battery cell configuration module, configured to configure the first battery cell 111;

[0143] A second battery cell configuration module is used to configure a second battery cell 112 to be disposed adjacent to the first battery cell 111 , wherein the energy density of the second battery cell 112 is less than that of the first battery cell 111 ;

[0144] The first thermal insulation member configuration module is configured to configure the first thermal insulation member 114 so as to dispose the first thermal insulation member 114 between the first battery cell 111 and the second battery cell 112 .

[0145] The battery preparation device of this embodiment configures the first battery cell 111 through the first battery cell configuration module, and configures the second battery cell 112 through the second battery cell configuration module, and the configured second battery cell 112 is arranged adjacent to the first battery cell 111, and the energy density of the second battery cell 112 is lower than that of the first battery cell 111, and the first thermal insulation member 114 is configured through the first thermal insulation member configuration module, and the configured first thermal insulation member 114 is arranged between the first battery cell 111 and the second battery cell 112. In this way, even if the thermal stability of the first battery cell 111 is worse and the thermal failure reaction of the first battery cell 111 is more intense than the thermal failure reaction of the second battery cell 112, when the first battery cell 111 fails thermally, the first thermal insulation member 112 can effectively delay or block the heat transfer between the first battery cell 111 and the second battery cell 112, thereby effectively reducing the probability of the first battery cell 111 triggering a chain reaction in the second battery cell 112, thereby improving the safety of the battery 11.

[0146] The battery manufacturing apparatus provided in this embodiment can be applied to the battery manufacturing method in the above embodiment. That is, the battery manufacturing method in the above embodiment can be specifically implemented using the battery manufacturing apparatus of this embodiment.

[0147] In summary, the battery 11, device, battery preparation method and battery preparation device provided in the present application can effectively delay or block the heat transfer between the first battery cell 111 and the second battery cell 112 by setting a first thermal insulation member 114 between the first battery cell 111 with higher energy density and the second battery cell 112 with lower energy density, thereby effectively reducing the probability of the first battery cell 111 triggering a chain reaction in the second battery cell 112, thereby improving the safety of the battery 11.

[0148] 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.

[0149] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0150] 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 them. 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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, wherein the first battery cell is provided with a first pressure relief mechanism, the first pressure relief mechanism being configured to be actuated to relieve the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold; a second battery cell disposed adjacent to the first battery cell, the second battery cell having an energy density lower than that of the first battery cell, the second battery cell being provided with a second pressure relief mechanism configured to be actuated to relieve internal pressure of the second battery cell when an internal pressure or temperature of the second battery cell reaches a threshold; a first thermal insulation member disposed between the first battery cell and the second battery cell; a discharge passage, the discharge passage being disposed opposite to the first pressure relief mechanism and / or the second pressure relief mechanism, and the discharge passage being 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; a thermal management component, configured to contain a fluid to regulate the temperature of the first battery cell and the second battery cell; Wherein, the thermal management component is arranged between the first battery cell, the second battery cell and the exhaust channel, and 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, and the exhaust of the first battery cell and the second battery cell enters the exhaust channel through the destroyed thermal management component.

2. The battery according to claim 1, characterized in that The first thermal insulator includes a hollow portion that penetrates the first thermal insulator in a thickness direction of the first thermal insulator, and the hollow portion is configured to provide a space allowing the first battery cell and / or the second battery cell to expand.

3. The battery according to claim 2, characterized in that The first heat insulating member is constructed into a U-shaped frame structure.

4. The battery according to claim 2, characterized in that The first heat insulating member further includes a filling member for filling the hollow portion, and the filling member is elastic.

5. The battery according to claim 4, characterized in that The filling piece is selected from at least one of foam, rubber, thermal insulation cotton, and aerogel thermal insulation pad.

6. The battery according to any one of claims 1 to 5, 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 is in the range of 1.26≤E1 / E2≤2.

14.

7. The battery according to any one of claims 1 to 5, characterized in that: 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.

8. The battery according to any one of claims 1 to 5, characterized in that: There are at least two first battery cells, and a second heat insulating member is disposed between two adjacent first battery cells.

9. The battery according to any one of claims 1 to 5, characterized in that: There are at least two second battery cells, and a third heat insulating member is disposed between two adjacent second battery cells.

10. The battery according to any one of claims 1 to 5, characterized in that: An area of ​​the first pressure relief mechanism is larger than an area of ​​the second pressure relief mechanism.

11. The battery according to any one of claims 1 to 5, characterized in that: There are at least two discharge channels, each of which is isolated from another. The first pressure relief mechanism and the second pressure relief mechanism are respectively arranged opposite to different discharge channels.

12. The battery according to any one of claims 1 to 5, characterized in that: There are at least two first battery cells, and the first pressure relief mechanisms of two adjacent first battery cells are respectively arranged opposite to different discharge channels; and / or, There are at least two second battery cells, and the second pressure relief mechanisms of two adjacent second battery cells are respectively arranged opposite to different discharge channels.

13. The battery according to any one of claims 1 to 5, characterized in that: The battery further includes a box having a plurality of walls for enclosing and forming a housing cavity for accommodating the first battery cell and the second battery cell. At least one of the plurality of walls has a hollow inner cavity for forming the discharge channel.

14. The battery according to claim 13, 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.

15. The battery according to claim 13, 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 is 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.

16. The battery according to claim 13, characterized in that The at least one wall is provided with a first through hole, which is configured to communicate with the exhaust channel so that exhaust from the first battery cell and / or the second battery cell enters the corresponding exhaust channel via the first through hole when the first battery cell and / or the second battery cell is actuated.

17. The battery according to claim 16, characterized in that The thermal management component is disposed between the first and second battery cells and the at least one wall.

18. The battery according to claim 17, 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.

19. The battery according to claim 18, characterized in that The second through hole communicates with the exhaust passage via the first through hole.

20. A device, characterized in that The battery according to any one of claims 1 to 19 is used to provide electrical energy.

21. A method for preparing a battery, characterized in that: The steps include: A first battery cell is provided, wherein the first battery cell is provided with a first pressure relief mechanism, wherein the first pressure relief mechanism is configured to be actuated to relieve 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 is configured to be disposed adjacent to the first battery cell, and the energy density of the second battery cell is lower than that of the first battery cell. The second battery cell is provided with a second pressure relief mechanism, and the second pressure relief mechanism is configured to be actuated to relieve the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value; configuring a first thermal insulation member so as to be disposed between the first battery cell and the second battery cell; configuring a vent passage to be disposed opposite the first pressure relief mechanism and / or the second pressure relief mechanism, and the vent passage being configured to collect effluent from the first battery cell when the first pressure relief mechanism is actuated, and / or to collect effluent from the second battery cell when the second pressure relief mechanism is actuated; configuring a thermal management component for containing a fluid to regulate the temperature of the first battery cell and the second battery cell; Wherein, the thermal management component is arranged between the first battery cell, the second battery cell and the exhaust channel, and 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, and the exhaust of the first battery cell and the second battery cell enters the exhaust channel through the destroyed thermal management component.

22. A battery manufacturing device, characterized in that: include: a first battery cell configuration module, configured to configure a first battery cell, wherein the first battery cell is provided with a first pressure relief mechanism, the first pressure relief mechanism being activated to relieve the internal pressure of the first battery cell when the internal pressure or temperature of the first battery cell reaches a threshold; a second battery cell configuration module, configured to configure a second battery cell to be disposed adjacent to the first battery cell, wherein the energy density of the second battery cell is lower than that of the first battery cell, and the second battery cell is provided with a second pressure relief mechanism, the second pressure relief mechanism being activated to relieve the internal pressure of the second battery cell when the internal pressure or temperature of the second battery cell reaches a threshold value; a first thermal insulation member configuration module, configured to configure a first thermal insulation member so as to dispose the first thermal insulation member between the first battery cell and the second battery cell; a drain channel configuration module, configured to configure a drain channel to be disposed opposite the first pressure relief mechanism and / or the second pressure relief mechanism, wherein the drain channel is configured to collect exhaust from the first battery cell when the first pressure relief mechanism is actuated, and / or to collect exhaust from the second battery cell when the second pressure relief mechanism is actuated; a thermal management component configuration module, configured to configure a thermal management component, wherein the thermal management component is configured to contain a fluid to regulate the temperature of the first battery cell and the second battery cell; Wherein, the thermal management component is arranged between the first battery cell, the second battery cell and the exhaust channel, and 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, and the exhaust of the first battery cell and the second battery cell enters the exhaust channel through the destroyed thermal management component.

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