Battery and electric device

Abstract

The embodiment of the utility model provides a battery and an electric device, and relates to the technical field of batteries. The battery comprises a box body, a battery monomer and a supporting piece, wherein the box body comprises a first wall; the battery monomers are positioned in the box body, and a pressure relief mechanism is arranged on one side of each battery monomer; the supporting piece is installed between the battery single body and the first wall, the supporting piece supports the battery single body, a gap is formed between the supporting piece and the first wall, and the supporting piece is provided with a weak structure. When the pressure relief mechanism of the battery monomer is used for relieving pressure, the weak structure can be at least partially separated from the supporting piece under the impact of high-temperature flue gas particles, so that the exhaust size of the supporting piece is enlarged, and the possibility that the high-temperature flue gas particles are blocked by the supporting piece to generate a reflection back-spraying phenomenon is reduced; and therefore, the possibility that the high-temperature flue gas particles damage the pressure-released single battery or damage the single battery adjacent to the pressure-released single battery is reduced, and the safety of the battery during pressure release is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] A battery includes multiple battery cells. When a battery cell is depressurized, it is easy for the high-temperature spray to be blocked and spray back. The back spray phenomenon is not only easy to damage the depressurized battery cell, but also easy to damage the battery cells adjacent to the depressurized battery cell. Therefore, how to reduce the possibility of back spray due to obstruction when the battery cell is depressurized is a research direction in battery technology. Utility Model Content

[0004] The present application provides a battery and an electrical device, which can reduce the possibility of back-spraying due to being blocked when the battery cell is depressurized.

[0005] In a first aspect, an embodiment of the present application provides a battery, comprising a case body, a battery cell and a support member, wherein the case body comprises a first wall; the battery cell is located in the case body, and a pressure relief mechanism is provided on a side of the battery cell facing the first wall; the support member is installed between the battery cell and the first wall, the support member supports the battery cell and has a gap with the first wall, the support member is provided with an exhaust hole, and the support member is provided with a weak structure around the exhaust hole, and the weak structure is configured to at least partially detach from the support member under a preset pressure and / or a preset temperature.

[0006] By adopting the above technical solution, the support member is designed to include a weak structure. When the pressure relief mechanism of the battery cell is relieving pressure, the weak structure can be separated from the support member under the impact of the high-temperature flue gas particles, thereby expanding the exhaust size of the support member and reducing the possibility of reflection and back-spraying of high-temperature flue gas particles due to obstruction by the support member, thereby reducing the possibility of damaging the battery cell undergoing pressure relief or damaging the pressure relief mechanism of the battery cell adjacent to the battery cell undergoing pressure relief, thereby improving the safety of the battery during pressure relief.

[0007] In some embodiments of the present application, the preset pressure is greater than or equal to 500 kp, and the preset temperature is greater than or equal to 300°C.

[0008] By adopting the above technical solution, the preset pressure is set to be greater than or equal to 500kp, and the preset temperature is set to be greater than or equal to 300°C. When the battery cell is depressurized, the pressure and temperature of the high-temperature flue gas particles are greater than the above preset temperature and pressure, so the weak structure can be easily flushed.

[0009] In some embodiments of the present application, along the arrangement direction from the support member to the first wall, the minimum thickness of the weak structure is dmm, and the minimum thickness of the remaining portion of the support member except the weak structure is Dmm, wherein d<D.

[0010] By adopting the above technical solution, the minimum thickness of the weak structure is designed to be smaller than the minimum thickness of the rest of the support member, so that the weak structure forms a thickness reduction area, thereby making the weak structure more easily opened by high-temperature flue gas particles.

[0011] In some embodiments of the present application, d / D is greater than or equal to 0.2.

[0012] By adopting the above technical solution, the ratio of the minimum thickness of the weak structure to the minimum thickness of the rest of the support is designed to be greater than or equal to 0.2, so that the thickness of the weak structure is smaller than that of the rest of the support, making it easier for the weak structure to be opened by high-temperature flue gas particles.

[0013] In some embodiments of the present application, the value of d / D is greater than or equal to 0.5.

[0014] By adopting the above technical solution, the ratio of the minimum thickness of the weak structure to the minimum thickness of the rest of the support is designed to be greater than 0.5. While facilitating the weak structure to be opened by high-temperature flue gas particles, the support component can have a certain structural strength, thereby reducing the possibility of unnecessary damage to the support component before the battery cell is depressurized.

[0015] In some embodiments of the present application, the weak structure has a first surface facing the battery cell and a second surface facing away from the battery cell, the first surface and / or the second surface is provided with a recess, and the position where the minimum thickness d of the weak structure is located is the position where the recess is located.

[0016] By adopting the above technical solution, the minimum thickness of the weak structure is made smaller than the minimum thickness of the remaining parts of the support member except the weak structure by providing the recess, and the structure is simple and easy to implement.

[0017] In some embodiments of the present application, a notch surrounding the exhaust hole is provided in the weak structure, and along the arrangement direction from the support member to the first wall, the thickness of the support member at the notch is less than the thickness of the remaining parts of the weak structure except the notch, and the notch is intermittently or continuously arranged along its surrounding direction.

[0018] By adopting the above technical solution, the weak structure is designed to have a notch surrounding the exhaust through hole, and the weak structure at the notch is weaker, so that the weak structure can be easily broken by high-temperature flue gas particles and separated from the support.

[0019] In some embodiments of the present application, the notches are arranged in multiple rows from a side of the weak structure away from the exhaust through hole to a side close to the exhaust through hole.

[0020] By adopting the above technical solution, the notches are arranged in multiple rows, so that the weak structure is weaker and it is easier for the weak structure to be broken by high-temperature flue gas particles and detach from the support.

[0021] In some embodiments of the present application, the weak structure includes a meltable material portion, and the meltable material portion is configured to melt when the preset temperature is reached.

[0022] By adopting the above technical solution, the weak structure is designed to include a meltable material portion, which melts when a preset temperature is reached, thereby facilitating the weak structure to be broken by high-temperature flue gas particles and detached from the support member.

[0023] In some embodiments of the present application, the meltable material portion includes at least one of a carbon fiber metal composite material portion, a polymer material portion, and a thermoplastic resin portion.

[0024] By adopting the above technical solution, the carbon fiber metal composite material part, the polymer material part and the thermoplastic resin part can meet the dual requirements of low melting point and structural strength.

[0025] In some embodiments of the present application, the battery further includes an adhesive layer, which is located between the support member and the battery cell and is disposed around the weak structure, and the support member and the battery cell are connected via the adhesive layer.

[0026] By adopting the above technical solution and connecting the support member and the battery cell using an adhesive layer, the connection stability between the support member and the battery cell can be improved.

[0027] In some embodiments of the present application, the weak structure has a first surface facing the battery cell, and the area of ​​the first surface is S1mm 2 The pressure relief area of ​​the pressure relief mechanism is S2mm 2 , where S1≥S2.

[0028] By adopting the above technical solution, the area enclosed by the weak structure is designed to be larger than the pressure relief area of ​​the equal pressure relief mechanism, so that the high-temperature flue gas particles sprayed out by the pressure relief mechanism can at least partially act on the weak structure, making it easier for the high-temperature flue gas particles to break through the weak structure for exhaust.

[0029] In some embodiments of the present application, along the arrangement direction from the support member to the first wall, the thickness of the adhesive layer is a mm, and S1, S2 and a satisfy: a*S1 / S2≥0.35.

[0030] By adopting the above technical solution, under this design, the possibility of high-temperature flue gas particles rebounding and impacting the pressure relief mechanism of adjacent battery cells can be reduced, thereby reducing the risk of thermal diffusion in the battery cells.

[0031] In some embodiments of the present application, the S1, the S2 and the a satisfy: a*S1 / S2≤1.95.

[0032] By adopting the above technical solution, the weak structure can have a certain structural strength, thereby reducing the possibility of the weak structure cracking after being impacted by vibration.

[0033] In some embodiments of the present application, the numerical range of a is 0.5 to 1.4.

[0034] By adopting the above technical solution, the thickness of the bonding layer is designed to be 0.5 to 1.4, so that the battery cell and the support have a certain bonding strength, reducing the risk of debonding between the two. At the same time, the value of a is not greater than 1.4, so S1 / S2 does not need to be set too large, which can reduce the possibility of the weak structure area being too large to affect the structural strength of the support.

[0035] In some embodiments of the present application, the battery also includes an insulating sheet, the weak structure has a first surface facing the battery cell, a second surface away from the battery cell, and a third surface located between the first surface and the second surface and surrounding the exhaust hole, and the insulating sheet is arranged around the exhaust hole and covers and connects to the first surface and the third surface.

[0036] By adopting the above technical solution, the insulating sheet is covered and connected to the first surface and the second surface, and the insulating sheet can insulate the battery cell and the first wall, thereby reducing the risk of high-temperature flue gas particles conducting the battery cell and the box body.

[0037] In some embodiments of the present application, a stop portion is provided at the outer periphery of the insulating sheet, the stop portion extends toward the battery cell and abuts against the battery cell, and the stop portion is used to stop the inner edge of the adhesive layer surrounding the weak structure.

[0038] By adopting the above technical solution, the stopper of the insulating sheet is used to limit the size and range of the inner circle of the adhesive layer, thereby reducing the possibility of the adhesive layer blocking the pressure relief mechanism and the exhaust through hole.

[0039] In some embodiments of the present application, the battery cell includes a busbar, and the busbar and the pressure relief mechanism are located on opposite sides or adjacent sides of the battery cell.

[0040] By adopting the above technical solution, the manifold and the pressure relief mechanism are designed to be located on opposite sides or adjacent sides of the battery cell, thereby reducing the possibility of high-temperature flue gas damaging the manifold when the pressure relief mechanism releases pressure.

[0041] In a second aspect, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0044] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0045] Figure 3 A partial structural schematic diagram of a battery provided in some embodiments of the present application;

[0046] Figure 4 for Figure 3 A magnified view of part A;

[0047] Figure 5 A partial structural schematic diagram of another battery provided in some embodiments of the present application;

[0048] Figure 6 for Figure 5 A magnified view of part B;

[0049] Figure 7 A schematic diagram of the structure of a support member provided in some embodiments of the present application;

[0050] Figure 8 A partial structural schematic diagram of another battery provided in some embodiments of the present application;

[0051] Fig. 9 for Figure 8 Enlarged view of part C.

[0052] The reference numerals of the specific embodiments are as follows:

[0053] 1000. Vehicles;

[0054] 100. Battery;

[0055] 10. Box body; 11. First part; 121. First wall; 12. Second part;

[0056] 20. Battery cell; 21. Pressure relief mechanism; 22. Current collector;

[0057] 30. Support member; 31. Exhaust hole; 32. Weak structure; 321. First surface; 322. Second surface; 323. Concave portion; 324. Notch;

[0058] 40. Adhesive layer;

[0059] 50. Insulating sheet; 51. Stopper;

[0060] 200, controller;

[0061] 300. Motor. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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 creative work are within the scope of protection of this application.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0064] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0065] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, H and / or B can represent: H exists alone, H and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0067] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0068] The term “plurality” used in this application refers to two or more (including two).

[0069] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0070] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0071] The battery cell mentioned in the embodiment of the present application is the smallest unit that constitutes the battery. The battery cell includes an end cap assembly, a shell, and an electrode assembly located in the shell. The end cap assembly refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cap assembly can be adapted to the shape of the shell to match the shell. The end cap assembly can be made of a material with a certain hardness and strength (such as aluminum alloy). Functional components such as poles can be provided on the end cap assembly. The pole can be electrically connected to the electrode assembly through an adapter to output or input the electrical energy of the battery cell. The electrode assembly is a component in the battery where an electrochemical reaction occurs. The shell is a component used to cooperate with the end cap assembly to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell and the end cap assembly can be independent components, and an opening can be provided on the shell, and the end cap assembly covers the opening to form the internal environment of the battery cell. Without limitation, the end cap assembly and the shell can also be integrated. Specifically, the end cap assembly and the shell can form a common connection surface before other components are put into the shell. When the interior of the shell needs to be encapsulated, the end cap assembly covers the shell. The shell can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the electrode assembly. The material of the shell can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. The electrode assembly is mainly formed by winding or stacking the positive and negative electrodes, and a diaphragm is usually provided between the positive and negative electrodes. The parts of the positive and negative electrodes with active substances constitute the main body of the electrode assembly, and the parts of the positive and negative electrodes without active substances each constitute the pole ears. The positive pole ear and the negative pole ear can be located at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the poles to form a current loop.

[0072] At present, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0073] When high temperature and high pressure occur inside the battery cell of the battery, the high-temperature flue gas particles and particulate matter brought out by the pressure relief mechanism of the battery cell diffuse into the interior of the battery. The battery cell is usually arranged facing the support member, and the support member is provided with an exhaust through hole. However, in order to ensure the supporting strength of the battery cell, the exhaust through hole of the support member is usually small. Therefore, when the battery cell is depressurized, the high-temperature flue gas particles are easily blocked by the support member, and the high-temperature flue gas particles rebound and spray back, which is not only easy to damage the battery cell being depressurized, but also more likely to damage the pressure relief mechanism of the remaining battery cells adjacent to the battery cell being depressurized, causing thermal runaway of the battery.

[0074] In view of this, the present application provides a technical solution, which aims to design the support member to have a weak structure that can be broken open by high-temperature pressure particles, thereby expanding the size of the exhaust holes of the support member and reducing the possibility of the support member blocking the high-temperature flue gas particles ejected when the battery cell is depressurized, thereby reducing the risk of damaging the pressure relief mechanism of the adjacent battery cell.

[0075] The battery cells described in the embodiments of the present application are suitable for use in batteries and electrical devices using the batteries.

[0076] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0077] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0078] Combined with Figure 1 As shown, the vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is arranged inside the vehicle 1000, and the battery 100 can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.

[0079] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] Combined with Figure 2 and 3 As shown, an embodiment of the present application provides a battery 100, including a case body 10, a battery cell 20 and a support member 30, wherein the case body 10 includes a first wall 121; the battery cell 20 is located in the case body 10, and a pressure relief mechanism 21 is provided on the side of the battery cell 20 facing the first wall 121; the support member 30 is installed between the battery cell 20 and the first wall 121, the support member 30 supports the battery cell 20, and has a gap with the first wall 121, the support member 30 is provided with an exhaust through hole 31, a part of the support member 30 is a weak structure 32 surrounding the exhaust through hole 31, and the weak structure 32 is configured to at least partially detach from the support member 30 under a preset pressure and / or a preset temperature.

[0081] The box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 includes a first wall 121, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The first part 11 can be a hollow structure with one end open, and the second part 12 can be a plate-like structure, and the second part 12 covers the open side of the first part 11, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0082] The first wall 121 may be a bottom wall of the first part 11. The first wall 121 and the multiple side walls of the first part 11 together form a receiving groove. It can be understood that the bottom wall refers to the wall of the battery 100 located at the bottom of the box body 10 in the figure. During the production, transportation and application of the battery 100, the bottom wall of this embodiment may be located above the side wall.

[0083] The battery 100 may be a secondary battery or a primary battery, and may also be a lithium sulfur battery, a sodium ion battery or a magnesium ion battery, but is not limited thereto. The battery cell 20 and the battery 100 may be cylindrical, flat, rectangular or in other shapes.

[0084] The pressure relief mechanism 21 is installed on the pressure relief port of the shell of the battery cell 20. The pressure relief mechanism 21 can 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 battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 21 executes an action or the weak structure provided in the pressure relief mechanism 21 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0085] The support member 30 can be mounted on the side wall or the crossbeam (not shown) of the first wall 121, so that a gas-exhausting interval is formed between the support member 30 and the first wall 121, and the battery cell 20 can be directly mounted on the support member 30. The material of the support member 30 can be metal or a non-metallic material (such as plastic or other polymer materials) with a certain structural strength.

[0086] The support member 30 is provided with an exhaust hole 31 and a weak structure 32. The weak structure 32 is arranged around the exhaust hole 31. The exhaust hole 31 can be directly opened on the weak structure 32, or there is a remaining part of the support member 30 between the exhaust hole 31 and the weak structure 32, and the exhaust hole 31 is surrounded by the remaining part of the support member 30 (this embodiment is not shown in the figure). Both of the above methods are acceptable.

[0087] The weak structure 32 is configured to at least partially detach from the support member 30 when subjected to a preset pressure and / or a preset temperature, and includes at least three implementations. One is that the weak structure 32 partially or completely detaches from the support member 30 when subjected to a pressure greater than or equal to a preset pressure. Another is that the weak structure 32 partially or completely detaches from the support member 30 when subjected to a temperature greater than or equal to a preset temperature. Still another is that the weak structure 32 partially or completely detaches from the support member 30 when subjected to a temperature greater than or equal to a preset temperature and a pressure greater than or equal to a preset pressure.

[0088] In some examples, optionally, the preset pressure of this embodiment is greater than or equal to 500 kp, and the preset temperature is greater than or equal to 300°C.

[0089] Of course, the specific preset pressure and preset temperature can be designed according to the specifications of the battery cells 20 , and the pressure and temperature of battery cells 20 of different specifications when releasing pressure are different.

[0090] When the weak structure 32 is partially or completely separated from the support 30, the size of the exhaust hole 31 is enlarged. When the battery cell 20 is depressurized, the high-temperature flue gas particles can be better discharged to the space between the support 30 and the box body 10, reducing the possibility of high-temperature flue gas particles being blocked by the support 30 and reflected back. The possibility of high-temperature flue gas particles damaging the depressurized battery cell 20, or damaging the pressure relief mechanism 21 of the battery cell 20 adjacent to the depressurized battery cell 20, thereby improving the safety of the battery cell 20 during pressure relief.

[0091] Combined with Figure 3 and attached Figure 4 As shown, in some examples, optionally, along the arrangement direction from the support member 30 to the first wall 121, the minimum thickness of the weak structure 32 is d mm, and the minimum thickness of the rest of the support member 30 except the weak structure 32 is D mm, where d<D.

[0092] The thickness of the weak structure 32 can be constant or variable. Therefore, the minimum thickness d of the weak structure 32 can be understood as the thickness of the weak structure 32 is the minimum thickness at any place, or the thickness of a certain area of ​​the weak structure 32 is smaller. Similarly, the minimum thickness D of the rest of the support member 30 except the weak structure 32 can be understood similarly.

[0093] The minimum thickness of the weak structure 32 in this design is designed to be smaller than the minimum thickness of the rest of the support member 30, so that the weak structure 32 forms a thickness reduction area, thereby making the weak structure 32 more easily opened by high-temperature flue gas particles.

[0094] In some examples, d / D is greater than or equal to 0.2.

[0095] For example, the value range of d / D may be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9.

[0096] In some embodiments, the minimum thickness dmm of the weak structure 32 may be in the range of 5mm-100mm, and the minimum thickness Dmm of the rest of the support member 30 except the weak structure 32 may be in the range of 10mm-100mm. For example, when dmm is 5mm, Dmm may be 10mm; when dmm is 10mm, Dmm may be 20mm; when dmm is 15mm, Dmm may be 35mm; when dmm is 20mm, Dmm may be 50mm; when dmm is 25mm, Dmm may be 50mm. This embodiment will not be listed one by one.

[0097] When the ratio of the minimum thickness of the weak structure 32 to the minimum thickness of the rest of the support member 30 is designed to be the above value, the thickness of the weak structure 32 is smaller than that of the rest of the support member 30, making it easier for the weak structure 32 to be opened by high-temperature flue gas particles.

[0098] In some examples, optionally, the value of d / D is greater than or equal to 0.5.

[0099] For example, the value range of d / D can be 0.5, 0.55, 0.6, 0.65 and 0.7, etc. This structural design takes into account that when the minimum thickness dmm of the weak structure 32 is too small, the structural strength of the weak structure 32 at the minimum thickness is the worst. Once the internal temperature of the battery 100 rises or is vibrated, the weak structure 32 is easily damaged or even broken at the minimum thickness, thereby reducing the overall structural strength of the support member 30 and affecting the support effect of the support member 30 on the battery cell 20.

[0100] Therefore, in this embodiment, the ratio of the minimum thickness of the weak structure 32 to the minimum thickness of the rest of the support member 30 is designed to be greater than 0.5. While facilitating the weak structure 32 to be opened by high-temperature flue gas particles, the support component can have a certain structural strength, thereby reducing the possibility of unnecessary damage to the support component before the battery cell 20 is depressurized.

[0101] Combined with Figure 5 and attached Figure 6 As shown, in some examples, optionally, the weak structure 32 has a first surface 321 facing the battery cell 20 and a second surface 322 facing away from the battery cell 20, and a recess 323 is provided on the first surface 321 and / or the second surface 322, and the position where the minimum thickness d of the weak structure 32 is located is where the recess 323 is located.

[0102] The above technical solution includes at least three implementation methods, one of which is as follows: Figure 3 and 4 The second surface 322 is provided with a recess 323, and the range of the recess 323 can cover the entire second surface 322, so that the weak structure 32 and the rest of the support member 30 form a stepped structure. Figure 5 and 6 As shown, a recess 323 is provided on the first surface 321, and the area of ​​the recess 323 may be smaller than or equal to the first surface 321. Another embodiment is to provide recesses 323 on both the first surface 321 and the second surface 322 (this embodiment is not shown in the figure).

[0103] The concave portion 323 can directly form the minimum thickness of the weak structure 32. The concave portion 323 can be directly formed by a mold or by a cutting process, which will not be listed in detail in this embodiment. By providing the concave portion 323, the minimum thickness of the weak structure 32 is smaller than the minimum thickness of the rest of the support member 30 except the weak structure 32. The structure is simple and easy to implement.

[0104] Combined with Figure 7 As shown, in some examples, optionally, a notch 324 surrounding the exhaust hole 31 is provided in the weak structure 32, and along the arrangement direction from the support member 30 to the first wall 121, the thickness of the notch 324 is less than the thickness of the remaining parts of the weak structure 32 except the notch 324, and the notch 324 is intermittently or continuously arranged along its surrounding direction.

[0105] The notch 324 refers to a groove or a broken line structure with a small width processed on the weak structure 32. The processing method can be stamping, cutting, milling, etc. Generally, the width of the notch 324 is not greater than 10 mm. The notch 324 can be intermittent or continuous. The shape of the notch 324 can be any shape such as circle, ellipse, rectangle, etc.

[0106] The weak structure 32 is designed to have a notch 324 surrounding the exhaust through hole 31 , and the weak structure 32 is weaker at the notch 324 , so that the weak structure 32 is easily broken by high-temperature flue gas particles and separated from the support member 30 .

[0107] In some examples, optionally, the notches 324 are arranged in multiple rows at intervals from a side of the weak structure 32 away from the exhaust through hole 31 to a side close to the exhaust through hole.

[0108] Each row of notches 324 may be discontinuous or continuous, and the spacing between two adjacent rows of notches 324 may be constant or gradual, which is not limited in this embodiment.

[0109] When the notches 324 are arranged in multiple rows at intervals, the structural strength of the weak structure 32 is weaker, and it is easier for the weak structure 32 to be broken by high-temperature flue gas particles and detach from the support member 30 .

[0110] In some examples, optionally, the weakened structure 32 includes a meltable material portion configured to melt when a preset temperature is reached.

[0111] The above technical solution can be understood as the entire weak structure 32 is made of meltable material, or part of the weak structure 32 is made of meltable material, for example, the connection between the weak structure 32 and the rest of the supporting component is made of meltable material.

[0112] In this embodiment, the meltable material portion, the notch 324 and the reduced thickness area can be selected or combined in pairs, or in combination of the three. The combination of the two includes providing the notch 324 or the reduced thickness area on the meltable material portion. The combination of the three means providing the reduced thickness area on the meltable material portion and providing the notch 324 on the reduced thickness area at the same time.

[0113] The weak structure 32 is designed to include a meltable material portion, which melts when a preset temperature is reached, thereby facilitating the weak structure 32 to be broken by high-temperature flue gas particles and detached from the support member 30 .

[0114] In some examples, optionally, the meltable material portion includes at least one of a carbon fiber metal composite material portion, a polymer material portion, and a thermoplastic resin portion.

[0115] That is, the meltable material in the meltable material portion may include at least one of a carbon fiber metal composite material, a polymer material, and a thermoplastic resin, or the meltable material portion has at least one of a carbon fiber metal composite material region, a polymer material region, and a thermoplastic resin region.

[0116] The carbon fiber metal composite material part, the polymer material part and the thermoplastic resin part can meet the dual requirements of low melting point and structural strength. Of course, the material selection of the meltable material part of this embodiment is not limited to this, and other materials with certain structural strength and meltable at a preset temperature can also be used as the material of the meltable material part of this embodiment.

[0117] In conjunction with this Figure 3-6 As shown, in some examples, optionally, the battery 100 further includes an adhesive layer 40 , which is located between the support member 30 and the battery cell 20 and is disposed around the weak structure 32 , and the support member 30 and the battery cell 20 are connected via the adhesive layer 40 .

[0118] The adhesive layer 40 may be a layered structure formed by bonding the support member 30 and the battery cell 20 with glue such as epoxy resin glue, silicone glue or polyurethane glue. The adhesive layer 40 is used to connect the support member 30 and the battery cell 20 to improve the connection stability between the support member 30 and the battery cell 20.

[0119] After the bonding layer 40 is formed, it has a middle open hole structure, thereby reducing the shielding of the high-temperature flue gas particles ejected by the pressure relief mechanism 21 , and the bonding layer 40 needs to be arranged around the weak structure 32 , thereby reducing the impact on the detachment of the weak structure 32 when the weak structure 32 detaches from the support member 30 .

[0120] In some examples, optionally, the weak structure 32 has a first surface 321 facing the battery cell 20 , the area of ​​the first surface 321 is S1 mm 2 , and the pressure relief area of ​​the pressure relief mechanism 21 is S2 mm 2 , wherein S1 ≥ S2 .

[0121] The pressure relief area of ​​the pressure relief mechanism 21 refers to the area of ​​the exhaust port (not shown in the figure) of the pressure relief mechanism 21, and the pressure relief area may be equal to or less than the area of ​​the pressure relief port on the shell of the battery cell 20. It should be noted that the area of ​​the exhaust port or pressure relief port may be understood as the projection area of ​​the exhaust port or pressure relief port on a plane parallel to the first surface.

[0122] The area enclosed by the weak structure 32 is designed to be larger than the pressure relief area of ​​the pressure relief mechanism 21, so that the high-temperature flue gas particles sprayed out by the pressure relief mechanism 21 can at least partially act on the weak structure 32, making it easier for the high-temperature flue gas particles to break through the weak structure 32 for exhaust.

[0123] In some examples, optionally, along the arrangement direction from the support member 30 to the first wall 121 , the thickness of the adhesive layer 40 is a mm, and S1 , S2 , and a satisfy: a*S1 / S2≥0.35.

[0124] The numerical range of S1 and S2 may be 100-5000. For example, S1 and S2 may be 100, 500, 900, 1000, 2000, and 5000.

[0125] The reason why a*S1 / S2 is designed to be greater than or equal to 0.35 is that the applicant has found that when the value of a is already small and a*S1 / S2 is less than 0.35, it means that the area enclosed by the weak structure 32 is too small. The area enclosed by the weak structure 32 is smaller than the area required for thermal runaway pressure relief of the battery cell 20. There is still a possibility that particles may rebound and impact the pressure relief mechanism 21 of the adjacent battery cell 20, resulting in the risk of heat diffusion.

[0126] When a*S1 / S2≥0.35, the possibility of high-temperature flue gas particles rebounding and impacting the pressure relief mechanism 21 of the adjacent battery cell 20 can be reduced, thereby reducing the risk of thermal diffusion of the battery cell 20.

[0127] In some examples, optionally, S1, S2, and a satisfy: a*S1 / S2≤1.95.

[0128] The above structural design is due to the applicant's discovery that when a*S1 / S2>1.95, the area of ​​the weak portion may be too large, the structural strength of the support member 30 is poor, and the supporting performance cannot meet the vibration impact requirements. After the vibration impact, the support component is prone to cracking at the weak structure 32.

[0129] When a*S1 / S2≤1.95, the weak structure 32 can have a certain structural strength, thereby reducing the possibility of the weak structure 32 cracking after receiving vibration impact.

[0130] In some examples, optionally, the value range of a is 0.5 to 1.4.

[0131] The thickness amm of the adhesive layer 40 is also the distance between the surface of the battery cell 20 facing the support 30 and the support 30 along the arrangement direction from the support 30 to the first wall 121 . For example, amm can be 0.5mm, 0.7mm, 0.8mm, 0.1mm, 1.4mm, etc.

[0132] The thickness of the adhesive layer 40 needs to meet the requirements of connecting the support member 30 and the battery cell 20, but the thickness of the adhesive layer 40 cannot be too large, because once the thickness of the adhesive layer 40 is too large, it means that S1 / S2 needs to be set too large, which means that the area of ​​the weak structure 32 is too large, which may affect the structural strength of the support member. In addition, if the thickness of the adhesive layer 40 is too large, it means that the pressure relief mechanism 21 and the exhaust through hole 31 on the support member 30, because the high-temperature flue gas particles ejected by the pressure relief mechanism 21 are irregularly ejected, the high-temperature flue gas particles ejected obliquely are easy to diffuse, resulting in the failure to meet the exhaust requirements even after the weak structure 32 falls off, causing some high-temperature flue gas particles to rebound and damage the pressure relief mechanism 21 of the adjacent battery cell 20.

[0133] In order to better understand the invention purpose, technical scheme and beneficial technical effect of the above-mentioned ratio design of a*S1 and S2, the present application is further described in detail in conjunction with Examples 1-12. However, it should be understood that the examples of the present application are only for explaining the present application, not for limiting the present application, and the examples of the present application are not limited to the examples given in the specification. The specific experimental conditions or operating conditions not specified in the examples are made under conventional conditions, or are made under the conditions recommended by the material supplier.

[0134] Example 1 can be operated according to the following steps: multiple battery cells 20 with a length, width and height of 31mm*238mm*117mm are taken to form a battery cell module, and the pressure relief area S2 of the pressure relief mechanism 21 of the battery cell 20 is uniformly 860mm 2 , a 300W heating device is placed inside the middle battery cell 20 to trigger thermal runaway; the battery cell 20 module is placed in the box 10, the area S1 surrounded by the weak structure 32 (including the exhaust hole 31) is 860mm2, and the thickness of the adhesive layer 40 is 0.3mm. The heating device is triggered to cause the battery cell 20 to release pressure. After the pressure release is completed, the battery cell 20 module is disassembled to observe whether the pressure relief mechanism 21 of the adjacent battery cell 20 is damaged.

[0135] Embodiment 2 has the same operation steps as the above-mentioned embodiment 1, except that S1 is 900.

[0136] Example 3 has the same operating steps as the above-mentioned Example 1, except that S1 is 1000.

[0137] Example 4 has the same operating steps as the above-mentioned Example 1, except that S1 is 1100.

[0138] Example 5 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200.

[0139] Example 6 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 0.5.

[0140] Example 7 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 0.8.

[0141] Example 8 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 1.

[0142] Example 9 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 1.2.

[0143] Example 10 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 1.3.

[0144] Example 11 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 1.4.

[0145] Example 12 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 1.5.

[0146] Example 13 has the same operating steps as the above-mentioned Example 1, except that S1 is 1200 and a is 2.

[0147] Example 14 has the same operating steps as the above-mentioned Example 1, except that S1 is 1300 and a is 2.

[0148] Example 15 has the same operating steps as the above-mentioned Example 1, except that S1 is 1400 and a is 1.5.

[0149] Example 16 has the same operating steps as the above-mentioned Example 1, except that S1 is 1400 and a is 2.

[0150] Example 17 has the same operating steps as the above-mentioned Example 1, except that S1 is 1600 and a is 2.

[0151] Example 18 has the same operating steps as the above-mentioned Example 1, except that S1 is 2000 and a is 2.

[0152] The evaluation results of Examples 1 to 18 are shown in Table 1 below.

[0153]

[0154] Referring to Examples 1-18, it can be seen that when a*S1 / S2<0.35, there is still a possibility that particles rebound and impact the pressure relief mechanism 21 of the adjacent battery cell 20, resulting in the risk of heat diffusion. When a*S1 / S2>1.95, the support performance cannot meet the vibration impact requirements, and the support component is prone to cracking at the weak structure 32 after vibration impact.

[0155] Therefore, this embodiment adopts the technical solution of 1.95≥a*S1 / S2≥0.35, which can reduce the possibility of high-temperature flue gas particles rebounding and impacting the pressure relief mechanism 21 of the adjacent battery cell 20, thereby reducing the risk of thermal diffusion in the battery cell 20, and can also make the weak structure 32 have a certain structural strength, reducing the possibility of the weak structure 32 cracking after receiving vibration impact.

[0156] Combined with Figure 8 and attached Fig. 9 As shown, in some embodiments, the battery 100 also includes an insulating sheet 50, the weak structure 32 has a first surface 321 facing the battery cell 20, a second surface 322 away from the battery cell 20, and a third surface located between the first surface 321 and the second surface 322 and surrounding the exhaust hole 31, and the insulating sheet 50 is arranged around the exhaust hole 31 and covers and connects to the first surface 321 and the third surface.

[0157] The insulating sheet 50 can be made of insulating materials such as ceramics and plastics. The middle area of ​​the insulating sheet 50 also needs to be hollowed out to avoid the weak structure 32. The insulating sheet 50 can be connected to the support member 30 by bonding, hot-melt connection, etc., and the insulating sheet 50 is covered and connected to the first surface 321 and the second surface 322. The insulating sheet 50 can insulate the battery cell 20 and the first wall 121, reducing the risk of high-temperature flue gas particles conducting the battery cell 20 and the box body 10.

[0158] In some examples, optionally, a stopper 51 is provided on the outer periphery of the insulating sheet 50 , the stopper 51 extends toward the battery cell 20 and abuts against the battery cell 20 , and the stopper 51 is used to stop the inner edge of the adhesive layer 40 surrounding the weak structure 32 .

[0159] The stopper 51 may be in a ring shape or a square shape, and the stopper 51 may form an angle less than or equal to 90° with the first surface 321 .

[0160] The insulating sheet 50 can be connected to the support member 30 first, and then the adhesive layer 40 can be laid, so that the stopper 51 of the insulating sheet 50 can be used to limit the size and range of the inner circle of the adhesive layer 40, thereby reducing the possibility of the adhesive layer 40 blocking the pressure relief mechanism 21 and the exhaust hole 31.

[0161] Combined with the attachment again Figure 3 , Attachment Figure 5 And attached Figure 8 As shown, in some examples, optionally, the battery cell 20 includes a busbar 22 , and the busbar 22 and the pressure relief mechanism 21 are located on opposite sides or adjacent sides of the battery cell 20 .

[0162] The busbar 22 is a conductive metal material (such as copper or aluminum). The busbar 22 is used to conductively connect two adjacent battery cells 20, or to conductively connect a battery cell 20 to the electrical control structure of the battery 100. The busbar 22 and the pressure relief mechanism 21 are designed to be located on opposite sides or adjacent sides of the battery cell 20, thereby reducing the possibility of high-temperature flue gas damaging the busbar 22 when the pressure relief mechanism 21 releases pressure.

[0163] Finally, please see the attached Figure 2-9As shown, this embodiment provides a battery 100, including a box body 10, a battery cell 20 and a support member 30, wherein the box body 10 includes a first wall 121; the battery cell 20 is located in the box body 10, and a pressure relief mechanism 21 is provided on the side of the battery cell 20 facing the first wall 121; the support member 30 is installed between the battery cell 20 and the first wall 121, the support member 30 supports the battery cell 20, and there is a gap between the support member 30 and the first wall 121, the support member 30 is provided with an exhaust through hole 31, and the support member 30 is provided with a weak structure 32 around the exhaust through hole 31, and the weak structure 32 is configured to at least partially separate from the support member 30 under a preset pressure and / or a preset temperature, wherein the preset pressure is greater than or equal to 500 kp, and the preset temperature is greater than or equal to 300°C. Along the arrangement direction from the support member 30 to the first wall 121, the minimum thickness of the weak structure 32 is dmm, and the minimum thickness of the rest of the support member 30 except the weak structure 32 is Dmm, wherein d<D. d / D is greater than or equal to 0.2. d / D is greater than or equal to 0.5. The weak structure 32 has a first surface 321 facing the battery cell 20 and a second surface 322 facing away from the battery cell 20. The first surface 321 and / or the second surface 322 are provided with a recess 323. The position where the minimum thickness d of the weak structure 32 is located is the position where the recess 323 is located. A notch 324 surrounding the exhaust through hole 31 is provided in the weak structure 32. Along the arrangement direction from the support member 30 to the first wall 121, the thickness of the notch 324 is less than the thickness of the remaining part of the weak structure 32 except the notch 324. The notch 324 is arranged intermittently or continuously along its surrounding direction. From the side of the weak structure 32 away from the exhaust through hole 31 to the side close to the exhaust through hole, the notch 324 is arranged in multiple rows at intervals. The weak structure 32 includes a meltable material portion, which is configured to melt when a preset temperature is reached. The meltable material portion includes at least one of a carbon fiber metal composite material portion, a polymer material portion, and a thermoplastic resin portion. The battery 100 further includes an adhesive layer 40, which is located between the support member 30 and the battery cell 20 and is disposed around the weak structure 32. The support member 30 and the battery cell 20 are connected via the adhesive layer 40. The weak structure 32 has a first surface 321 facing the battery cell 20, and the area of ​​the first surface 321 is S1mm. 2 , the pressure relief area of ​​the pressure relief mechanism 21 is S2mm 2, wherein S1≥S2. Along the arrangement direction from the support member 30 to the first wall 121, the thickness of the adhesive layer 40 is amm, and S1, S2 and a satisfy: a*S1 / S2≥0.35. S1, S2 and a satisfy: a*S1 / S2≤1.95. The numerical range of a is 0.5 to 1.4. The battery 100 also includes an insulating sheet 50, the weak structure 32 has a first surface 321 facing the battery cell 20, a second surface 322 away from the battery cell 20, and a third surface located between the first surface 321 and the second surface 322 and surrounding the exhaust through hole 31, the insulating sheet 50 is arranged around the exhaust through hole 31, and covers and connects to the first surface 321 and the third surface. The outer periphery of the insulating sheet 50 is provided with a stopper 51 that is tilted toward the direction close to the battery cell 20, and the stopper 51 is used to stop the inner edge of the adhesive layer 40 surrounding the weak structure 32. The battery cell 20 includes a busbar 22 . The busbar 22 and the pressure relief mechanism 21 are located at opposite sides or adjacent sides of the battery cell 20 .

[0164] Based on the above-mentioned battery 100 , an embodiment of the present application further provides an electrical device, including the above-mentioned battery 100 , wherein the battery 100 is used to provide electrical energy to the electrical device, and the electrical device may be a vehicle 1000 .

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for the intermediate technical features, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A box body including a first wall; A battery cell is located in the box, and a pressure relief mechanism is provided on a side of the battery cell facing the first wall; A support member is installed between the battery cell and the first wall, the support member supports the battery cell and has a gap with the first wall, the support member is provided with an exhaust hole, and the support member is provided with a weak structure around the exhaust hole, and the weak structure is configured to at least partially detach from the support member under a preset pressure and / or a preset temperature.

2. The battery according to claim 1, characterized in that The preset pressure is greater than or equal to 500 kp, and the preset temperature is greater than or equal to 300°C.

3. The battery according to claim 1, characterized in that Along the arrangement direction from the support member to the first wall, the minimum thickness of the weak structure is dmm, and the minimum thickness of the remaining portion of the support member except the weak structure is Dmm, wherein d<D.

4. The battery according to claim 3, characterized in that d / D is greater than or equal to 0.

2.

5. The battery according to claim 4, characterized in that d / D is greater than or equal to 0.

5.

6. The battery according to claim 3, characterized in that The weak structure has a first surface facing the battery cell and a second surface away from the battery cell. A recess is formed on the first surface and / or the second surface. The position where the weak structure has a minimum thickness d is where the recess is located.

7. The battery according to claim 1, characterized in that A notch surrounding the exhaust hole is provided in the weak structure. Along the arrangement direction from the support member to the first wall, the thickness of the support member at the notch is less than the thickness of the remaining parts of the weak structure except the notch. The notch is intermittently or continuously arranged along its surrounding direction.

8. The battery according to claim 7, characterized in that The notches are arranged in multiple rows from a side of the weak structure away from the exhaust through hole to a side close to the exhaust through hole.

9. The battery according to claim 1, characterized in that The weakened structure includes a meltable material portion configured to melt when the preset temperature is reached.

10. The battery according to claim 9, characterized in that The meltable material portion includes at least one of a carbon fiber metal composite material portion, a polymer material portion, and a thermoplastic resin portion.

11. The battery according to claim 1, characterized in that The battery further comprises an adhesive layer, which is located between the support member and the battery cell and is arranged around the weak structure. The support member and the battery cell are connected via the adhesive layer.

12. The battery according to claim 11, characterized in that The weak structure has a first surface facing the battery cell, and the area of ​​the first surface is S1mm 2 The pressure relief area of ​​the pressure relief mechanism is S2mm 2 , where S1≥S2.

13. The battery according to claim 12, characterized in that Along the arrangement direction from the support member to the first wall, the thickness of the adhesive layer is a mm, and S1, S2 and a satisfy: a*S1 / S2≥0.

35.

14. The battery according to claim 13, characterized in that The S1, the S2 and the a satisfy: a*S1 / S2≤1.

95.

15. The battery according to claim 14, characterized in that The numerical range of a is 0.5 to 1.

4.

16. The battery according to claim 11, characterized in that The battery also includes an insulating sheet, the weak structure has a first surface facing the battery cell, a second surface away from the battery cell, and a third surface located between the first surface and the second surface and surrounding the exhaust hole, the insulating sheet is arranged around the exhaust hole and covers and connects to the first surface and the third surface.

17. The battery according to claim 16, characterized in that A stopper is provided at the outer periphery of the insulating sheet. The stopper extends toward the battery cell and abuts against the battery cell. The stopper is used to stop the adhesive layer from surrounding the inner edge of the weak structure.

18. The battery according to any one of claims 1 to 17, characterized in that: The battery cell includes a current collector, and the current collector and the pressure relief mechanism are respectively located at opposite sides or adjacent sides of the battery cell.

19. An electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 18, wherein the battery is used to provide electrical energy.

Images