Batteries and power consumption devices

Abstract

An embodiment of the present application provides a battery and a power consumption device. The battery includes a housing, a battery unit, and a protective member. The housing includes a first wall. The battery unit is accommodated in the housing, and a pressure relief mechanism is provided in the battery unit, and the pressure relief mechanism is used to form a pressure relief hole and release a substance inside the battery unit. The protective member is accommodated in the housing, and at least a part of the protective member is located between the first wall and the pressure relief mechanism and is used to cover the pressure relief hole in an axial direction of the pressure relief hole. The minimum size along the axial direction of the part of the protective member that covers the pressure relief hole in the axial direction is D, and the maximum temperature of the substance released by the battery unit through the pressure relief hole is T, and D and T are within a range of 5×10 -4 mm / ℃≦D / T≦5.3×10 -3 mm / ° C. The embodiments of the present application can improve the safety of the battery.

Description

[Technical Field]

[0001] This application relates to the battery technology field, and more specifically to batteries and power consumption devices. [Background technology]

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

[0003] Improving battery safety is a key area of ​​research in battery technology. [Overview of the project]

[0004] This application provides a battery and a power consumption device that can improve safety.

[0005] According to a first aspect, an embodiment of the present application provides a battery including a housing, a battery unit, and a protective member. The housing includes a first wall. The battery unit is housed within the housing and is provided with a pressure relief mechanism, which is used to form pressure relief holes and release material from inside the battery unit. The protective member is housed within the housing and at least a portion of the protective member is located between the first wall and the pressure relief mechanism and is used to cover the pressure relief holes in the axial direction of the pressure relief holes. The minimum axial size of the portion of the protective member that covers the pressure relief holes in the axial direction is D, and the maximum temperature of the material released by the battery unit through the pressure relief holes is T, where D and T are 5 × 10⁻⁶. -4 mm / ℃ ≤ D / T ≤ 5.3 × 10 -3 Meets the mm / °C requirement.

[0006] The higher the temperature of the substance released when the battery unit undergoes thermal runaway, the greater the thermal shock received by the protective member, and the higher the demand for D of the protective member. Conversely, the lower the temperature of the substance released when the battery unit undergoes thermal runaway, the smaller the thermal shock received by the protective member, and the lower the demand for D of the protective member. When the maximum temperature T is determined, in order to reduce the risk of the protective member being breached and reduce the amount of heat transferred to the first wall, it is necessary to ensure the minimum value of D. Of course, the larger the value of D, the larger the volume and weight of the protective member. When the maximum temperature T is determined, the redundancy of the size design of the protective member may be reduced by limiting the maximum value of D. The above technical solution limits the value of D / T to 5×10 -4 mm / ℃ - 5.3×10 -3 mm / ℃, so as to reduce the redundancy of the size design of the protective member on the premise of meeting the thermal protection requirements, reduce the loss of the energy density of the battery, and improve the safety of the battery.

[0007] In some embodiments, D and T satisfy 5×10 -4 mm / ℃ ≤ D / T ≤ 3.3×10 -3 mm / ℃.

[0008] In some embodiments, the value of D is 0.5 mm - 5 mm, which reduces the redundancy of the size design of the protective member on the premise of meeting the thermal protection requirements, reduces the loss of the energy density of the battery, reduces the difficulty of forming the protective member, and improves the safety of the battery.

[0009] In some embodiments, in any direction perpendicular to the axial direction, the size of the protective member is larger than the size of the pressure relief hole. The protective member has a relatively large size compared to the pressure relief hole, which can effectively block the high-temperature and high-speed substance, reduce the risk of the high-temperature and high-speed substance directly colliding with the first wall, and improve the safety.

[0010] In some embodiments, the volume energy density of the battery unit is E, and D and E satisfy 1×10 -3 mm·L / Wh ≤ D / E ≤ 1×10-2 satisfies mm·L / Wh.

[0011] In principle, the volume energy density E of the battery unit has a positive correlation with the maximum temperature T. Compared with the maximum temperature T, the volume energy density E of the battery unit is more easily determined. The above technical solution indirectly characterizes the maximum temperature T by the volume energy density E, and limits the value of D by the volume energy density E, thereby reducing the difficulty of designing the protection member.

[0012] In some embodiments, D and E are 1×10 -3 mm·L / Wh ≤ D / E ≤ 6×10 -3 satisfies mm·L / Wh.

[0013] In some embodiments, in the maximum size direction perpendicular to the axial direction of the pressure relief hole, the size of the pressure relief hole is k, and the size of the protection member along the maximum size direction is K. k, K, and T satisfy K > k, (K / k) / T ≥ 1×10 -3 / ℃.

[0014] The higher the temperature of the substance released when the battery unit undergoes thermal runaway, the more intense the thermal shock of the substance released by the battery unit to the protection member, the higher the risk that the released substance scatters to the part not shielded by the protection member of the first wall, and the higher the temperature of the part not shielded by the protection member of the first wall. The above technical solution limits the size relationship in the maximum size direction between the protection member and the pressure relief hole based on the maximum temperature T of the substance released when the battery unit undergoes thermal runaway, so as to keep the temperature of the part not shielded by the protection member of the first wall within a certain range, thereby reducing the risk of damage to the first wall. ​​​​​​​​​​It satisfies the / °C requirement. This proposed technology can reduce redundancy in the size design of protective components and reduce the loss of energy density in the battery.

[0017] In some embodiments, the minimum axial distance between the protective member and the pressure relief hole is h, where h and D satisfy 0.2 ≤ h / D ≤ 250. By limiting the value of h / D to 0.2-250, redundancy in the size design of the protective member can be reduced while maintaining compatibility with thermal protection requirements, thereby reducing the loss of energy density in the battery and improving battery safety.

[0018] In some embodiments, the protective member is a flat plate structure, and the thickness direction of the protective member is parallel to the axial direction. The flat plate structure is easy to mold.

[0019] In some embodiments, the thickness of the protective member gradually decreases from the middle to both sides in the direction of maximum size perpendicular to the axial direction of the pressure relief hole, and the thickness direction of the protective member is parallel to the axial direction. The portion of the protective member with the greatest thickness covers at least a portion of the pressure relief hole in the axial direction.

[0020] The thickest part of the protective component faces the pressure relief hole, allowing it to withstand relatively large thermal shocks and reducing the risk of the protective component being breached. The thermal shocks experienced at both ends of the protective component are relatively small, allowing it to have a relatively small thickness, reducing the weight and volume of the protective component and improving the energy density of the battery.

[0021] In some embodiments, the protective member includes a base region and a reinforcing region connected to the base region, wherein the axial size of the reinforcing region is greater than the axial size of the base region. In the axial direction, the reinforcing region covers at least a portion of the pressure relief hole. The reinforcing region faces the pressure relief hole and can withstand relatively large thermal shocks, reducing the risk of the protective member being breached.

[0022] In some embodiments, the reinforcing region completely covers the pressure relief hole in the axial direction. The reinforcing region can withstand relatively large thermal shocks, thus reducing the risk of the protective member being breached. The base region does not face the pressure relief hole in the axial direction, and it may have a relatively small thickness to reduce the weight and volume of the protective member and improve the energy density of the battery.

[0023] In some embodiments, the size of the protective member in the maximum size direction perpendicular to the axial direction of the pressure relief hole is K, and the size of the reinforced area is K1. K, K1, and T are such that K > K1, (K / K1) / T ≤ 3 × 10 -3 Meets the temperature limit of / ℃.

[0024] The higher the maximum temperature T of the material released when the battery unit experiences thermal runaway, the more severe the thermal shock to the protective material caused by the material released by the battery unit, and the higher the size requirements for the reinforced area of ​​the protective material. The above technical proposal sets the value of (K / K1) / T to 3 × 10⁻⁶. -3 By limiting the temperature to below / °C, the reinforcing region and the substrate region block the high-temperature, high-speed material, reducing the amount of heat transferred to the first wall and thus lowering the temperature of the first wall.

[0025] In some embodiments, both the reinforcement region and the base region are flat plate structures, and the thickness direction of both the reinforcement region and the base region are parallel to the axial direction.

[0026] In some embodiments, the size of the reinforcement region along the axial direction is D, and the size of the base region along the axial direction is d. In the maximum size direction perpendicular to the axial direction of the pressure relief hole, the size of the pressure relief hole is k, and the size of the reinforcement region is K1. D, d, k, and K1 satisfy 0.04 ≤ (K1 / k) / (D / d) ≤ 300.

[0027] As the K1 / k value increases, the proportion of the reinforced area that is subjected to thermal shock when the battery unit experiences thermal runaway increases, reducing the thermal runaway protection requirements that the base area must fulfill. Correspondingly, the D / d ratio may increase, i.e., the thickness requirement of the base area may decrease. As the K1 / k value decreases, the thermal runaway protection requirements that the base area must fulfill increase, and correspondingly, the D / d ratio may decrease, i.e., the thickness requirement of the base area increases. When K1 / k is sufficiently small, the thermal runaway protection requirements that the base area must fulfill are relatively large, there is a minimum value for D / d, i.e., there is a maximum value for d, thereby satisfying the thermal runaway protection requirements of the base area. When K1 / k is sufficiently large, the thermal runaway protection requirements that the base area must fulfill are relatively small, there is a maximum value for D / d, i.e., there is a minimum value for d, reducing design redundancy. The above technical proposal reduces the redundancy in the size design of protective components while maintaining compatibility with thermal protection requirements by limiting the value of (K1 / k) / (D / d) to 0.04-300, thereby reducing the loss of energy density in the battery and improving battery safety.

[0028] In some embodiments, the protective member includes a first protective plate and a second protective plate that are stacked and installed along the axial direction, wherein the portion where the first protective plate and the second protective plate overlap in the axial direction and the second protective plate constitute a reinforced region, and the portion where the first protective plate and the second protective plate do not overlap in the axial direction constitutes a base region.

[0029] By laminating the first protective plate and the second protective plate, a protective member with a difference in thickness is formed, thereby simplifying the molding process of the protective member.

[0030] In some embodiments, the second protective plate is installed on one side of the first protective plate facing the pressure release mechanism, which can improve the flatness of the side of the protective member that is away from the pressure release mechanism and facilitate the fixing of the protective member to other members.

[0031] In some embodiments, there are multiple second protective panels, and these multiple second protective panels are installed at intervals.

[0032] In some embodiments, multiple second protective plates are installed at intervals in the direction of maximum size perpendicular to the axial direction of the pressure relief hole.

[0033] In some embodiments, both the first protective plate and the second protective plate are flat plates, and the thickness direction of both the first protective plate and the second protective plate are parallel to the axial direction.

[0034] In some embodiments, the first protective plate is a flat plate structure, and the thickness direction of the first protective plate is parallel to the axial direction. In the maximum size direction perpendicular to the axial direction of the pressure relief hole, the size of the second protective plate along the axial direction gradually decreases from the middle to both ends.

[0035] The largest portion of the second protective plate along its axial direction may face the pressure relief hole, thereby reducing the risk of the protective member being punctured by a relatively large thermal shock. The thermal shock experienced at both ends of the second protective plate is relatively small, and in order to reduce the weight and volume of the second protective plate and improve the energy density of the battery, it may have a relatively small thickness.

[0036] In some embodiments, the material of the second protective plate differs from that of the first protective plate. By using different materials for the first and second protective plates, and combining the properties of these different materials, it is possible to create a protective member with higher thermal shock resistance. Compared to first and second protective plates made of the same material, first and second protective plates made of different materials can have a more varied structure.

[0037] In some embodiments, the first wall is located above or below the battery unit.

[0038] In some embodiments, the melting point of the protective member is higher than 1000°C. The protective member has a relatively high melting point, which makes it less likely to melt when subjected to thermal shock, thereby giving the protective member relatively good thermal shock resistance and reducing the risk of the protective member being punctured.

[0039] In some embodiments, the melting point of the protective member is higher than that of the first wall. The protective member has better thermal shock resistance to the first wall, thereby providing thermal protection and reducing the risk of the first wall being damaged.

[0040] In some embodiments, the protective member is fixed to a first wall. The first wall can fix the protective member in place, thereby reducing the risk of the protective member moving around due to the impact of high-temperature, high-speed material, reducing the probability of the protective member colliding and being damaged, and reducing the risk of the protective member losing its protective effect.

[0041] In some embodiments, the protective member is fixed to the first wall by adhesive, welding, fastening, or locking.

[0042] According to a second aspect, an embodiment of the present application provides a power consumption device which includes a battery of any embodiment of the first aspect for providing electrical energy. [Brief explanation of the drawing]

[0043] To more clearly illustrate the technical concept of the embodiments of this application, the following briefly introduces the drawings that may be used in the embodiments of this application. It is obvious that the drawings in the following description are only a few of the embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without expending any creative effort. [Figure 1] This is a schematic diagram of the structure of a vehicle according to several embodiments of this application. [Figure 2] This is a schematic diagram of a battery exploded according to some embodiments of this application. [Figure 3] This is a schematic diagram of one structure of a battery according to several embodiments of this application. [Figure 4] Figure 3 shows another schematic diagram of the battery structure, where the pressure release mechanism of the battery unit is in the operating state. [Figure 5]This is an enlarged schematic diagram of the circular frame A of the battery shown in Figure 4. [Figure 6] This is a schematic diagram of the structure of a battery unit of a battery according to several embodiments of this application. [Figure 7] This is a schematic diagram of one structure of a battery according to several embodiments of this application. [Figure 8] This is a schematic diagram of one structure of a battery according to several other embodiments of this application. [Figure 9] This is a schematic diagram of one structure of a battery according to several other embodiments of this application. [Figure 10] This is an enlarged schematic diagram of block B in Figure 9. [Figure 11] This is a schematic diagram of one structure of a battery according to several other embodiments of this application. [Figure 12] This is a schematic diagram of one structure of a battery according to several other embodiments of this application. [Figure 13] This is a schematic diagram of one structure of a battery according to several other embodiments of this application. [Figure 14] This is a schematic diagram of one structure of a battery according to several other embodiments of this application. [Figure 15] This is a schematic diagram of one structure of a battery according to several other embodiments of this application.

[0044] In drawings, the drawings are not drawn to the actual scale. [Modes for carrying out the invention]

[0045] To clarify the purpose, technical proposal, and advantages of the embodiments of this application, the following clearly describes the technical proposal in the embodiments of this application, linking it with the drawings of the embodiments. Clearly, the embodiments described are only some, not all, embodiments of this application. All other embodiments derived from the embodiments of this application without the creative effort of a person skilled in the art are all within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as that commonly understood by those skilled in the art relating to this application. In this application, terms used in the specification are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “includes” and “have,” and any variations thereof, in the description of the specification, claims, and drawings of this application are intended to intentionally cover the non-exclusive “includes.” Terms such as “first,” “second,” etc., in the specification, claims, or drawings of this application are not intended to describe a particular order or hierarchical relationship, but to distinguish different subjects.

[0047] The “Examples” as used in this application mean that certain features, structures, or characteristics described in conjunction with the Examples may be included in at least one Example of this application. The occurrence of this phrase in each location in the specification does not necessarily refer to the same Example, nor does it mean that each Example is mutually exclusive or alternative to the others.

[0048] In the description of this application, unless otherwise specifically defined or limited, the terms “attachment,” “connection,” “connection,” and “installation” should be understood in a broad sense. For example, a fixed connection may be a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. A person skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0049] In this application, the terms "and / or" merely describe the relationship between related objects, indicating that three relationships are possible. For example, A and / or B may represent three cases: A alone, a combination of A and B, or B alone. In this application, the character " / " generally indicates that the preceding and succeeding related objects are in an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals indicate the same component, and for the sake of brevity, detailed descriptions of the same component are omitted in different embodiments. It should be understood that the dimensions such as thickness, aspect ratio, etc., of various components in the embodiments of this application shown in the drawings, and the dimensions such as thickness, aspect ratio, etc., of the entire assembly device, are for illustrative purposes only and do not constitute any limitation of this application.

[0051] As used in this application, "multiple" refers to two or more (including two).

[0052] In this application, the term "parallel" includes not only absolutely parallel lines but also nearly parallel lines as is generally recognized in engineering, and the term "perpendicular" includes not only absolutely perpendicular lines but also nearly perpendicular lines as is generally recognized in engineering.

[0053] In this application, the battery unit may include a lithium-ion battery unit, a lithium-sulfur battery unit, a sodium-lithium-ion battery unit, a sodium-ion battery unit, or a magnesium-ion battery unit, and the embodiments of this application are not limited thereto. The battery unit may be cylindrical, flattened, rectangular, or have other shapes, and the embodiments of this application are not limited thereto.

[0054] The battery referred to in the embodiments of this application is a single physical module comprising one or more battery units to provide higher voltage and capacity. The battery generally includes a housing for packaging one or more battery units. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery units.

[0055] The development of battery technology requires the simultaneous consideration of a wide range of design elements, such as energy density, cycle life, discharge capacity, and charge / discharge ratio, as well as battery safety.

[0056] The pressure release mechanism of a battery unit has a significant impact on its safety. For example, when phenomena such as short circuits or overcharging occur, there is a risk of a rapid increase in pressure due to thermal runaway inside the battery unit. In such cases, the pressure release mechanism activates to release the internal pressure to the outside, preventing the battery unit from exploding or catching fire.

[0057] The pressure release mechanism may be an element or component that activates when the battery unit reaches certain conditions. For example, the pressure release mechanism may be an element or component that activates to release internal pressure and / or internal material when the internal pressure or internal temperature of the battery unit reaches a predetermined threshold. This threshold design will vary depending on the design requirements. This threshold may depend on one or more materials among the positive electrode plate, negative electrode plate, electrolyte, and separator components in the battery unit.

[0058] The pressure relief mechanism can take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and can specifically use a pressure-sensitive element or structure, i.e., when the internal pressure of the battery unit reaches a predetermined threshold, the pressure relief mechanism operates, or a vulnerable region provided in the pressure relief mechanism ruptures, thereby forming a pressure relief hole that can release the internal pressure. Alternatively, the pressure relief mechanism may use a temperature-sensitive element or structure, i.e., when the internal temperature of the battery unit reaches a predetermined threshold, the pressure relief mechanism operates to form a pressure relief hole that can release the internal pressure. Alternatively, the pressure relief mechanism may be an actively operable component, and exemplary, the pressure relief mechanism may operate when it receives a control signal from the battery.

[0059] The pressure relief mechanism may take other forms. For example, the pressure relief mechanism may be a relatively low-strength structure on the battery unit housing, and when the battery unit experiences thermal runaway, the relatively low-strength structure cracks or deforms to form a pressure relief hole for releasing internal pressure. For example, the pressure relief mechanism may be a solder joint on the battery unit housing.

[0060] As used in this application, "operation" refers to the release of internal pressure and / or internal materials from the battery unit through the operation or activation of a pressure release mechanism. Operation by the pressure release mechanism may include, but is not limited to, the rupture, shattering, tearing, or opening of at least a portion of the pressure release mechanism. When the pressure release mechanism is activated, high-temperature, high-speed materials inside the battery unit are discharged as waste from the operating parts. By releasing pressure in the battery unit, where pressure can be controlled in this manner, the occurrence of potentially more serious accidents can be avoided.

[0061] The emissions from the battery unit referred to in this application include, but are not limited to, electrolyte, dissolved or fragmented positive and negative electrode plates, fragments of separator components, high-temperature, high-speed gases generated by the reaction, and flames.

[0062] When the battery unit overheats, it releases waste into the casing. The casing is also equipped with a pressure relief mechanism, which, when activated, expels the waste outside the casing at a set position.

[0063] The inventors realized that the waste emitted by the battery unit is at a high temperature and high speed, and if the waste collides with the housing, it could cause damage to the housing. This could prevent the waste from being released by the housing's pressure release mechanism, causing it to release pressure from the point of damage to the housing, thereby creating a risk of fire outside the battery and posing a safety risk.

[0064] After discovering the above problem, the inventor attempted to install a protective member in a position opposite the pressure release mechanism of the battery unit. The protective member blocks the high-temperature, high-speed material released by the battery unit, thereby reducing the thermal shock to the housing, lowering the risk of damage to the housing, and improving safety.

[0065] Through their research, the inventors discovered that when a battery unit experiences thermal runaway, if the temperature of the material released by the battery unit is too high, the relatively thin protective material can be punctured by the high-temperature, high-speed material released from the battery unit, creating a perforation in the protective material. This perforation can then cause the high-temperature, high-speed material to collide with the housing, potentially damaging the housing. To reduce the risk of the protective material being punctured by the high-temperature, high-speed material, the inventors attempted to increase the size of the protective material. However, increasing the size of the protective material reduces the energy density of the battery, and if the protective material is oversized, it results in wasted energy density.

[0066] In light of this, the inventor has provided a technical solution that reduces the risk of the protective member melting and penetrating, and reduces the wasted energy density of the battery, by setting the size of the protective member according to the temperature of the substance emitted by the battery unit.

[0067] The invention described in the embodiments of this application is applicable to power consumption devices that use batteries.

[0068] Power-consuming devices may include vehicles, mobile phones, portable devices, laptop computers, steamships, aerospace vehicles, electric toys, and power tools. Vehicles may be fuel-oil vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extender vehicles. Aerospace vehicles include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric steamship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiments of this application do not particularly limit the power-consuming devices described above.

[0069] In the following embodiments, for the sake of explanation, we will use a vehicle as an example of the power consumption device.

[0070] Figure 1 is a schematic diagram of the structure of a vehicle according to some embodiments of this application.

[0071] As shown in Figure 1, a battery 2 is installed inside the vehicle 1, and the battery 2 may be installed at the bottom, front, or rear of the vehicle 1. The battery 2 may be used to supply power to the vehicle 1, for example, the battery 2 may be used as the operating power source for the vehicle 1.

[0072] Vehicle 1 may further include a controller 3 and a motor 4, the controller 3 being used to control the battery 2 to supply power to the motor 4, for example, to meet the power consumption requirements for starting, navigating, and driving Vehicle 1.

[0073] In some embodiments of this application, the battery 2 can be used not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, providing driving power to the vehicle 1 in place of or in place of gasoline or natural gas.

[0074] Figure 2 is a schematic diagram of a battery exploded according to some embodiments of this application.

[0075] As shown in Figure 2, the battery 2 includes a housing 20 and a battery unit 10, the battery unit 10 being housed within the housing 20.

[0076] The housing 20 is used to house the battery unit 10, and the housing 20 may have various structures. In some embodiments, the housing 20 may include a first housing portion 21 and a second housing portion 22, the first housing portion 21 and the second housing portion 22 overlapping each other, and the first housing portion 21 and the second housing portion 22 together define a housing space for housing the battery unit 10.

[0077] In some embodiments, the second housing portion 22 may be a hollow structure with one end open, and the first housing portion 21 is a plate-like structure, and the first housing portion 21 is placed over the open side of the second housing portion 22, thereby forming a housing 20 having a storage space. In some other embodiments, both the first housing portion 21 and the second housing portion 22 may be hollow structures with one side open, and the open side of the first housing portion 21 is placed over the open side of the second housing portion 22, thereby forming a housing 20 having a storage space.

[0078] The first housing portion 21 and the second housing portion 22 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0079] To improve the sealing performance after connecting the first housing portion 21 and the second housing portion 22, a sealing material may be installed between the first housing portion 21 and the second housing portion 22, such as a sealant or a sealing ring.

[0080] Assuming that the first housing portion 21 is placed over the top of the second housing portion 22, the first housing portion 21 is also called the upper housing lid, and the second housing portion 22 is also called the lower housing 20.

[0081] In battery 2, there may be one battery unit 10 or multiple battery units 10. If there are multiple battery units 10, the multiple battery units 10 may be connected in series, in parallel, or in series-parallel, where series-parallel connection means that the multiple battery units 10 are connected in both series and parallel. The multiple battery units 10 may be connected in series, in parallel, or in series-parallel as a whole, and then the entire assembly composed of the multiple battery units 10 may be housed in the housing 20. Of course, the multiple battery units 10 may first be connected in series, in parallel, or in series-parallel to combine them into a battery module, and then the multiple battery modules may be further connected in series, in parallel, or in series-parallel to form a whole, and then housed in the housing 20.

[0082] Figure 3 is a schematic diagram of one structure of a battery according to some embodiments of this application, Figure 4 is a schematic diagram of another structure of the battery shown in Figure 3, where the pressure release mechanism of the battery unit is in the operating state, Figure 5 is an enlarged schematic diagram of the circular frame A of the battery shown in Figure 4, Figure 6 is a schematic diagram of the structure of the battery unit of a battery according to some embodiments of this application, and Figure 7 is a schematic diagram of one structure of a battery according to some embodiments of this application.

[0083] As shown in Figures 3 to 7, the battery 2 of the embodiment of this application includes a housing 20, a battery unit 10, and a protective member 30. The housing 20 includes a first wall 21a. The battery unit 10 is housed within the housing 20 and is provided with a pressure relief mechanism 11, which is used to form a pressure relief hole 111 and release material inside the battery unit 10. The protective member 30 is housed within the housing 20 and at least a portion of the protective member 30 is located between the first wall 21a and the pressure relief mechanism 11 and is used to cover the pressure relief hole 111 in the axial direction Z. The minimum size of the portion of the protective member 30 that covers the pressure relief hole 111 in the axial direction Z is D, and the maximum temperature of the material released by the battery unit 10 through the pressure relief hole 111 is T, where D and T are 5 × 10 -4 mm / ℃ ≤ D / T ≤ 5.3 × 10 -3 Meets the mm / °C requirement.

[0084] The housing 20 may be the outer casing of the battery 2, and the battery unit 10 is located inside the casing. The housing 20 can prevent liquids or other foreign matter from affecting the charging or discharging of the battery unit 10.

[0085] The first wall 21a of the housing 20 is a wall facing the pressure release mechanism 11 in the axial direction Z of the housing 20. The first wall 21a may be a top wall located above the battery unit 10 of the housing 20, a bottom wall located below the battery unit 10 of the housing 20, or a side wall located on one side of the battery unit 10 of the housing 20. Of course, the first wall 21a may be a wall located at another position on the housing 20. Exemplarily, the first wall 21a may be a part of the first housing portion 21, or a part of the second housing portion 22.

[0086] This embodiment does not limit the shape of the first wall 21a. For example, the first wall 21a may be flat, curved, or have any other shape.

[0087] The battery unit 10 may be one or multiple. Illustratively, the battery unit 10 is multiple. Selectively, the pressure release mechanisms 11 of the multiple battery units 10 are all facing the first wall 21a.

[0088] The battery unit 10 includes one or more battery cells. A battery cell is the smallest unit that makes up a battery and can independently realize the functions of charging and discharging. The battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-package battery cell, or other battery cell.

[0089] The battery cell includes a battery cell housing, an electrode assembly 13, an electrolyte, and other functional components, the electrode assembly 13 and the electrolyte being housed within the battery cell housing.

[0090] Exemplary, an electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator member. A battery cell operates primarily by the movement of metal ions between the positive and negative electrode plates. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being coated on the surface of the positive electrode current collector. The positive electrode current collector includes a positive electrode current collector section and a positive electrode tab, the positive electrode current collector section being coated with the positive electrode active material layer, and the positive electrode tab not being coated with the positive electrode active material layer. Taking a lithium-ion battery cell as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material layer may include a positive electrode active material such as lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector, the negative electrode current collector including a negative electrode current collecting section and a negative electrode tab, the negative electrode current collecting section being coated with the negative electrode active material layer and the negative electrode tab not being coated with the negative electrode active material layer. The material of the negative electrode current collector may be copper, and the negative electrode active material layer includes a negative electrode active material, which may be carbon or silicon, etc. The material of the separator member may be PP (polypropylene) or PE (polyethylene), etc. The battery cell housing may be a rigid housing, for example, the battery cell housing may be made of an aluminum alloy, or the battery cell housing may be a flexible housing, for example, the battery cell housing may be made of an aluminum plastic film.

[0091] In some examples, the battery unit 10 may consist of a single battery cell, the housing 12 of the battery unit 10 may be a battery cell housing, and the pressure relief mechanism 11 may be installed in the housing 12. In some other examples, the battery unit 10 may consist of a housing 12 and multiple battery cells housed within the housing 12, and the pressure relief mechanism 11 may be installed in the housing 12.

[0092] Exemplary, the housing 12 of the battery unit 10 includes a second wall 12a facing a first wall 21a, the pressure relief mechanism 11 is attached to the second wall 12a, and the second wall 12a is located on one side of the electrode assembly 13 facing the first wall 21a. The pressure relief mechanism 11 may be fixed to the second wall 12a by welding, bonding or other means, or alternatively, the pressure relief mechanism 11 and the second wall 12a may be formed integrally.

[0093] When the battery unit 10 is in a normal state, the pressure release mechanism 11 does not form a pressure release hole 111. The pressure release mechanism 11 reduces the risk of electrolyte leakage by sealing the electrode assembly 13 and electrolyte of the battery unit 10 inside the battery unit 10. If thermal runaway occurs inside the battery unit 10, the pressure release mechanism 11 activates to form a pressure release hole 111, allowing the material inside the battery unit 10 to be released to the outside of the battery unit 10 through the pressure release hole 111.

[0094] Examples of substances released through the pressure relief port 111 include, but are not limited to, electrolyte, dissolved or split positive and negative electrode plates, fragments of separator members, high-temperature, high-speed substances generated by the reaction, and flames.

[0095] The protective member 30 may be entirely located between the first wall 21a and the pressure relief mechanism 11, or only a portion of it may be located between the first wall 21a and the pressure relief mechanism 11. Exemplarily, the first wall 21a and the pressure relief mechanism 11 are installed along the axial direction Z, and in the axial direction Z, at least a portion of the protective member 30 is located between the first wall 21a and the pressure relief mechanism 11.

[0096] When the pressure relief mechanism 11 is activated and the pressure relief hole 111 is formed, the protective member 30 can cover the pressure relief hole 111 in the axial direction Z. In this embodiment, "the protective member 30 covers the pressure relief hole 111 in the axial direction Z" means that the projection of the pressure relief hole 111 in the axial direction Z is located within the projection of the protective member 30 in the axial direction Z. The area of ​​the projection of the protective member 30 in the axial direction Z may be greater than or equal to the area of ​​the projection of the pressure relief hole 111 in the axial direction Z.

[0097] The protective member 30 may be a plate-like structure, a frame structure, or another structure. For example, the protective member 30 may be a flat plate of uniform thickness or a plate of uneven thickness.

[0098] The protective member 30 may have an integrated structure or it may have a structure assembled from multiple sub-members.

[0099] The protective member 30 may be fixed to the first wall 21a, to the battery unit 10, or to other members within the housing 20, and the embodiments of this application are not limited thereto.

[0100] The high-temperature resistance of the protective member 30 is superior to that of the first wall 21a. In other words, when subjected to the same high-temperature, high-speed impact, the protective member 30 is less likely to be damaged than the first wall 21a.

[0101] The portion of the protective member 30 that covers the pressure relief hole 111 in the axial direction Z may be abbreviated as the protective part, and the projection of the protective part in the axial direction Z completely overlaps with the projection of the pressure relief hole 111 in the axial direction Z. The protective part is more susceptible to impact from high-temperature, high-speed materials than other parts of the protective member 30.

[0102] For example, T may be the highest temperature of the substance acting on the protective member 30.

[0103] For example, the maximum temperature T of the substance released by the battery unit 10 through the pressure relief port 111 can be obtained by measuring it in the following way.

[0104] Test sample: A battery unit 10 in a fully charged state.

[0105] Test flow: The battery unit 10 is placed in a sealed tank, and a temperature sensor is positioned at a set distance from the pressure relief mechanism 11 in the direction of gas ejection after thermal runaway of the battery unit 10 (i.e., the axial direction Z of the formed pressure relief hole 111). The thermal runaway of the battery unit 10 is triggered, the pressure relief mechanism 11 of the battery unit 10 is activated and the pressure relief hole 111 is formed, the substance inside the battery unit 10 is released through the pressure relief hole 111 and acts on the temperature sensor; the temperature sensor detects the temperature of the released substance from the battery unit 10 in real time and records the highest temperature T measured during the thermal runaway process of the battery unit 10.

[0106] In the test flow, the distance between the temperature sensor and the pressure relief mechanism 11 may be set based on the distance between the protective member 30 and the pressure relief mechanism 11 in the battery 2. For example, the set distance in the test flow may be 10 mm, 20 mm, or 30 mm. For a method of triggering thermal runaway of the battery unit 10, refer to GB 38031-2020 C.5.3.4.

[0107] The material released when the battery unit 10 experiences thermal runaway acts on the protective member 30, which reduces the thermal shock the first wall 21a receives and decreases the amount of heat transferred to the first wall 21a, thereby reducing the risk of the first wall 21a melting and being penetrated, and improving the safety of the battery 2. The larger the value of D, the higher the temperature that the protective member 30 can withstand, the lower the risk of the protective member 30 being penetrated by high-temperature, high-speed material, and the less heat is transferred to the first wall 21a.

[0108] The higher the temperature of the material released when the battery unit 10 experiences thermal runaway, the greater the thermal shock the protective member 30 receives, and the higher the demand for D from the protective member 30. Conversely, the lower the temperature of the material released when the battery unit 10 experiences thermal runaway, the smaller the thermal shock the protective member 30 receives, and the lower the demand for D from the protective member 30. If the maximum temperature T is determined, it is necessary to guarantee a minimum value of D in order to reduce the risk of the protective member 30 being breached and to reduce the amount of heat transferred to the first wall 21a. Of course, the larger the value of D, the larger the volume and weight of the protective member 30 will be. If the maximum temperature T is determined, limiting the maximum value of D may reduce the redundancy in the size design of the protective member 30 while being compatible with the thermal protection requirements, thereby reducing the loss of energy density of the battery 2.

[0109] The inventor, through research, found that the D / T value is 5 × 10 -4 mm / ℃ -5.3 × 10 -3 By limiting the range to mm / °C, the redundancy in the size design of the protective member 30 is reduced while maintaining compatibility with thermal protection requirements, thereby minimizing the energy density loss of the battery 2 and improving the safety of the battery 2.

[0110] In some embodiments, the D / T value is 5 × 10 -4 mm / ℃, 7 × 10 -4 mm / ℃, 9 × 10 -4 mm / ℃, 1 × 10 -3 mm / ℃, 1.5 × 10 -3 mm / ℃, 3 × 10 -3 mm / ℃, 3.3 × 10 -3 mm / ℃, 5 × 10 -3 mm / ℃ or 5.5 × 10 -3 The temperature is mm / °C.

[0111] In some embodiments, the thermal shock resistance of the protective member 30 is superior to that of the first wall 21a. Thermal shock resistance refers to the ability of a material to withstand rapid temperature changes without fracture. In other words, when subjected to the same high-temperature, high-speed impact, the protective member 30 is less likely to break than the first wall 21a.

[0112] In some embodiments, the protective member 30 can serve as an insulator to reduce the amount of heat transferred to the first wall 21a. When the battery unit 10 experiences thermal runaway, the presence of the protective member 30 reduces the amount of heat conducted to the first wall 21a, thus allowing embodiments of this application to reduce the requirements for the material of the housing 20.

[0113] For example, the housing 20 may be made of a material that cannot withstand high temperatures, such as polyester. Of course, the housing 20 may also be made of a material that is relatively resistant to high temperatures, such as aluminum, steel, or other metals. If the housing 20 is made of a relatively resistant material, the D / T value may be adaptively reduced, thereby reducing the space and weight occupied by the protective member 30 and improving the energy density of the battery 2.

[0114] In some embodiments, D and T are 5 × 10 -4 mm / ℃ ≤ D / T ≤ 3.3 × 10 -3 Meets the mm / °C requirement.

[0115] In some embodiments, the value of D is 0.5 mm–5 mm. Selectively, the value of D is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0116] The smaller the value of D, the higher the risk of the protective member 30 being penetrated by a high-temperature, high-speed material. Conversely, the larger the value of D, the lower the risk of the protective member 30 being penetrated by a high-temperature, high-speed material, and the larger the space and weight occupied by the protective member 30 within the battery 2. By limiting the value of D to 0.5mm-5mm, the inventor reduces the redundancy in the size design of the protective member 30 while maintaining compatibility with thermal protection requirements, thereby reducing the energy density loss of the battery 2, lowering the difficulty of molding the protective member 30, and improving the safety of the battery 2.

[0117] In some embodiments, the protective member 30 has thermal insulation properties, and its thermal conductivity is lower than that of the first wall 21a. The protective member 30 can act as an insulator, reducing the amount of heat conducted to the first wall 21a when the battery unit 10 experiences thermal runaway. In other alternative embodiments, the protective member 30 may have relatively good thermal conductivity, allowing it to rapidly conduct heat to its surroundings, reduce heat concentration, and lower the temperature of the first wall 21a.

[0118] In some embodiments, the material of the protective member 30 includes at least one of inorganic salts, inorganic ceramics, elemental metals, elemental carbon, and organic colloids.

[0119] In some examples, inorganic salts include silicates.

[0120] In some examples, inorganic ceramics include at least one of alumina, silica, boron carbide, boron nitride, silicon carbide, silicon nitride, and zirconia.

[0121] In some examples, the elemental metal system includes at least one of copper, iron, aluminum, tungsten, and titanium.

[0122] In some examples, elemental carbon includes at least one of amorphous carbon and graphite.

[0123] In some examples, the organic colloid includes at least one of epoxy resin structural adhesives, acrylate structural adhesives, polyimide structural adhesives, maleimide structural adhesives, polyurethane structural adhesives, and acrylic structural adhesives.

[0124] In some embodiments, the material of the protective member 30 includes at least two of the following: inorganic salts, inorganic ceramics, elemental metals, elemental carbon, and organic colloids.

[0125] A composite structure formed from multiple materials can improve the thermal shock resistance and thermal insulation performance of the protective member 30.

[0126] In some embodiments, the protective member 30 includes a carbon fiber sheet formed from a carbon fiber cloth and an organic colloid.

[0127] In some embodiments, the protective member 30 includes a resin sheet formed from inorganic ceramic powder and organic colloid.

[0128] In some embodiments, the protective member 30 includes a graphite layer and a metal layer that are installed in a laminated manner.

[0129] In some embodiments, the protective member 30 includes a composite fiber sheet made of carbon fibers and ceramic fibers.

[0130] In some embodiments, the protective member 30 includes a ceramic layer and a metal mesh connected to the ceramic layer.

[0131] In some embodiments, the melting point of the protective member 30 is higher than 1000°C. The protective member 30 has a relatively high melting point, which makes it less likely to melt when subjected to thermal shock, thereby giving the protective member 30 relatively good thermal shock resistance and reducing the risk of the protective member 30 being punctured.

[0132] In some embodiments, the melting point of the protective member 30 is higher than 1500°C.

[0133] In some embodiments, the melting point of the protective member 30 is higher than that of the first wall 21a. The protective member 30 has better thermal shock resistance than the first wall 21a, thereby performing a thermal protection function and reducing the risk of damage to the first wall 21a.

[0134] In some embodiments, the protective member 30 is fixed to the first wall 21a. The first wall 21a can fix the protective member 30, thereby reducing the risk of the protective member 30 moving around due to the impact of high-temperature, high-speed material, reducing the probability of the protective member 30 colliding and being damaged, and reducing the risk of the protective member 30 losing its protective effect.

[0135] In some embodiments, the protective member 30 is fixed to the first wall 21a by adhesive, welding, fastening, or locking. Of course, the protective member 30 may be fixed to the first wall 21a by other means.

[0136] In some embodiments, the protective member 30 is installed on the inner surface of the first wall 21a.

[0137] In some embodiments, the first wall 21a is located above or below the battery unit 10. Exemplarily, as shown in Figure 3, the first wall 21a is located above the battery unit 10.

[0138] In some embodiments, the volumetric energy density of the battery unit 10 is E, and D and E are equal to 1 × 10⁻⁶. -3 mm·L / Wh ≤ D / E ≤ 1 × 10 -2 Satisfying the mm·L / Wh requirement.

[0139] The unit of volumetric energy density E is Wh / L. E = C / V1, where C is the capacity of the battery unit 10 and V1 is the volume of the battery unit 10.

[0140] For illustrative purposes, the volume of the housing 12 of the battery unit 10 is taken as the volume of the battery unit 10, and the volume of the pole column 14 protruding from the housing 12 of the battery unit 10 is not considered. For example, the length, width, and height of the housing 12 of the rectangular battery unit are l1, l2, and l3, respectively, and V1 = l1 × l2 × l3.

[0141] Generally, when thermal runaway occurs in the battery unit 10, the higher the value of E, the more intense the chain reaction that occurs inside the battery unit 10, and the higher the temperature of the high-temperature, high-speed material released by the battery unit 10.

[0142] The higher the volumetric energy density E of the battery unit 10, the higher the temperature of the material emitted by the battery unit 10, the greater the thermal shock experienced by the protective member 30, and the higher the demand for D on the protective member 30. Conversely, the lower the volumetric energy density E of the battery unit 10, the lower the temperature of the material emitted by the battery unit 10, the smaller the thermal shock experienced by the protective member 30, and the lower the demand for D on the protective member 30. When the volumetric energy density E is determined, it is necessary to guarantee a minimum value for D in order to reduce the risk of the protective member 30 being penetrated and to reduce the amount of heat transferred to the first wall 21a. Of course, the larger the value of D, the larger the volume and weight of the protective member 30. When the volumetric energy density E is determined, limiting the maximum value of D may reduce the redundancy in the size design of the protective member 30 while being compatible with the thermal protection requirements, thereby reducing the loss of energy density of the battery 2.

[0143] The volumetric energy density E of the battery unit 10 is, in principle, positively correlated with the maximum temperature T, and the volumetric energy density E of the battery unit 10 is easier to determine than the maximum temperature T. Through experiments and calculations, the inventors attempted to reduce the difficulty of designing the protective member 30 by indirectly characterizing the maximum temperature T with respect to the volumetric energy density E and by limiting the value of D with respect to the volumetric energy density E.

[0144] Selectively, the value of D / E is 1 × 10 -3 mm·L / Wh, 2 × 10 -3 mm·L / Wh, 4×10 -3 mm·L / Wh, 6×10 -3 mm·L / Wh, 8×10 -3 mm·L / Wh or 1 × 10 -2 It is mm·L / Wh.

[0145] In some embodiments, D and E are 1 × 10 -3 mm·L / Wh ≤ D / E ≤ 6 × 10 -3 Satisfying the mm·L / Wh requirement.

[0146] In some embodiments, the size of the protective member 30 is greater than the size of the pressure relief hole 111 in any direction perpendicular to the axial direction Z.

[0147] The high-temperature, high-speed material released through the pressure relief hole 111 mainly flows along the axial direction Z of the pressure relief hole 111, and of course, some of the high-temperature, high-speed material may dissipate into the surroundings even after passing through the pressure relief hole 111. In this embodiment, the protective member 30 has a relatively large size compared to the pressure relief hole 111, which can effectively block the high-temperature, high-speed material, reduce the risk of the high-temperature, high-speed material directly impacting the first wall 21a, and improve safety.

[0148] In some embodiments, the size of the pressure relief hole 111 in the maximum size direction X perpendicular to the axial direction Z of the pressure relief hole 111 is k, and the size of the protective member 30 along the maximum size direction X is K. k, K, and T satisfy K > k and (K / k) / T ≥ 1 × 10⁻³ / °C.

[0149] In multiple directions perpendicular to the axial direction Z, the size of the pressure relief hole 111 along one of these directions is greater than or equal to the size of the pressure relief hole 111 along the other directions, and this direction is called the maximum size direction X of the pressure relief hole 111. The size K of the protective member 30 is the size of the protective member 30 along the maximum size direction X of the pressure relief hole 111.

[0150] The higher the temperature of the substance released when the battery unit 10 experiences thermal runaway, the more severe the thermal shock to the protective member 30 caused by the substance released by the battery unit 10. This increases the risk that the released substance will scatter to parts of the first wall 21a that are not shielded by the protective member 30, and consequently, the temperature of those parts of the first wall 21a that are not shielded by the protective member 30 will also increase.

[0151] The inventor reduces the risk of the first wall 21a being damaged by limiting the size relationship between the protective member 30 and the pressure relief hole 111 in the maximum size direction X, based on the highest temperature T of the substance released when the battery unit 10 experiences thermal runaway, thereby keeping the temperature of the portion of the first wall 21a not shielded by the protective member 30 within a certain range.

[0152] When the maximum temperature of the material released by the battery unit 10 during thermal runaway is relatively low, the protective member 30 may have a relatively small size, thereby reducing the space and weight of the battery 2 occupied by the protective member 30 and improving the energy density. When the maximum temperature T of the material released by the battery unit 10 during thermal runaway is relatively high, the protective member 30 may have a relatively large size, thereby increasing the area of ​​the first wall 21a shielded by the protective member 30 and reducing the temperature of the first wall 21a.

[0153] In some embodiments, k, K, and T are (K / k) / T ≥ 2 × 10 -3 Meets the temperature limit of / ℃.

[0154] In some embodiments, k, K, and T are (K / k) / T ≤ 2.7 × 10 -1 The temperature of / ℃ is satisfied. This embodiment can reduce the redundancy in the size design of the protective member 30 and reduce the loss of energy density of the battery 2.

[0155] In some embodiments, the value of (K / k) / T is 1 × 10⁻⁶ -3 / ℃, 2 × 10 -3 / ℃, 5×10 -3 / ℃, 1 × 10 -2 / ℃, 5×10 -2 / ℃, 1 × 10 -1 / ℃, 2 × 10 -1 / ℃ or 2.7 × 10 -1 It is / ℃.

[0156] In some embodiments, the minimum distance in the axial direction Z between the protective member 30 and the pressure relief hole 111 is h, and h and D satisfy 0.2 ≤ h / D ≤ 250.

[0157] When h is sufficiently low, the temperature and velocity of the high-temperature, high-speed material acting on the protective member 30 do not decrease significantly, the thermal shock experienced by the protective member 30 is relatively large, and correspondingly, there is a minimum value for D that ensures a protective effect. When h is sufficiently high, the temperature and velocity of the high-temperature, high-speed material acting on the protective member 30 decrease significantly, the thermal shock experienced by the protective member 30 is relatively small, and correspondingly, there is a maximum value for D, thereby achieving compatibility with thermal runaway protection requirements while also being economical and reducing design redundancy. Through experiments and calculations, the inventors have found that by limiting the value of h / D to 0.2-250, redundancy in the size design of the protective member 30 is reduced while maintaining compatibility with thermal protection requirements, thereby reducing the energy density loss of the battery 2 and improving the safety of the battery 2.

[0158] In some embodiments, the h / D value is 0.2, 1, 5, 10, 50, 100, 150, 200, or 250.

[0159] In some embodiments, multiple battery units 10 are provided within the housing 20, and the protective member 30 is used to cover the pressure relief holes 111 of the multiple battery units 10 in the axial direction Z. Regardless of which battery unit 10 experiences thermal runaway, the protective member 30 acts as an insulator for high-temperature, high-speed material, reducing the risk of damage to the first wall 21a.

[0160] In some embodiments, the protective member 30 has a flat plate structure, and the thickness direction of the protective member 30 is parallel to the axial direction Z. Exemplarily, the thickness of the protective member 30 is D.

[0161] In some embodiments, the battery 2 includes a plurality of sequentially arranged battery units 10, and exemplary, the arrangement direction Y of the plurality of battery units 10 is perpendicular to the axial direction Z and the maximum size direction X.

[0162] Figure 8 is a schematic diagram of one battery structure according to several other embodiments of this application.

[0163] As shown in Figure 8, in some embodiments, the thickness of the protective member 30 gradually decreases from the middle to both sides in the maximum size direction X perpendicular to the axial direction Z of the pressure relief hole 111, and the thickness direction of the protective member 30 is parallel to the axial direction Z. The portion of the protective member 30 with the greatest thickness covers at least a portion of the pressure relief hole 111 in the axial direction Z.

[0164] The thickest part of the protective member 30 faces the pressure relief hole 111, allowing it to withstand relatively large thermal shocks and reducing the risk of the protective member 30 being breached. The thermal shocks received by both ends of the protective member 30 are relatively small, allowing them to have a relatively small thickness, reducing the weight and volume of the protective member 30 and improving the energy density of the battery 2.

[0165] In some embodiments, the protective member 30 has a sloped surface on one side facing the pressure relief hole 111, which guides the flow of high-temperature, high-speed material and reduces the thermal shock experienced by the protective member 30.

[0166] Figure 9 is a schematic diagram of one battery structure according to several other embodiments of this application, and Figure 10 is an enlarged schematic view of block B in Figure 9.

[0167] As shown in Figures 9 and 10, in some embodiments, the protective member 30 includes a base region 30a and a reinforcing region 30b connected to the base region 30a, wherein the size of the reinforcing region 30b along the axial direction Z is larger than the size of the base region 30a along the axial direction Z. In the axial direction Z, the reinforcing region 30b covers at least a portion of the pressure relief hole 111.

[0168] The reinforced area 30b faces the pressure relief hole 111 and can withstand relatively large thermal shocks, reducing the risk of the protective member 30 being punctured.

[0169] In some embodiments, the reinforcing region 30b completely covers the pressure relief hole 111 in the axial direction Z. The reinforcing region 30b can withstand relatively large thermal shocks, thus reducing the risk of the protective member 30 being breached. The base region 30a does not face the pressure relief hole 111 in the axial direction Z, and it may have a relatively small thickness in order to reduce the weight and volume of the protective member 30 and improve the energy density of the battery 2.

[0170] In some embodiments, the size of the protective member 30 is K and the size of the reinforced area 30b is K1 in the maximum size direction X perpendicular to the axial direction Z of the pressure relief hole 111. K, K1, and T are such that K > K1 and (K / K1) / T ≤ 3 × 10 -3 Meets the temperature limit of / ℃.

[0171] The higher the maximum temperature T of the substance released when the battery unit 10 experiences thermal runaway, the more severe the thermal shock to the protective member 30 by the substance released by the battery unit 10, and the higher the size requirement for the reinforcement region 30b of the protective member 30. The inventor calculated the value of (K / K1) / T to be 3 × 10⁻⁶. -3 By limiting the temperature to below / ℃, the reinforcing region 30b and the substrate region 30a block the high-temperature, high-speed material, reducing the amount of heat transferred to the first wall 21a and thus lowering the temperature of the first wall 21a.

[0172] In some embodiments, there are two base regions 30a, each located on either side of the reinforcement region 30b along the maximum size direction X.

[0173] In some embodiments, the two substrate regions 30a are symmetric with respect to a virtual plane perpendicular to the maximum size direction X.

[0174] In some embodiments, both the reinforcing region 30b and the base region 30a are flat plate structures, and the thickness direction of both the reinforcing region 30b and the base region 30a are parallel to the axial direction Z.

[0175] For example, the thickness of reinforced region 30b is D.

[0176] In some embodiments, the size of the reinforcement region 30b along the axial direction Z is D, and the size of the base region 30a along the axial direction Z is d. In the maximum size direction X perpendicular to the axial direction Z of the pressure relief hole 111, the size of the pressure relief hole 111 is k, and the size of the reinforcement region 30b is K1. D, d, k, and K1 satisfy 0.04 ≤ (K1 / k) / (D / d) ≤ 300.

[0177] As the K1 / k value increases, the proportion of the reinforcement region 30b that is subjected to thermal shock when the battery unit 10 experiences thermal runaway increases, and the thermal runaway protection requirements that the base region 30a must fulfill decrease. Accordingly, the D / d ratio may increase, that is, the thickness requirement of the base region 30a may decrease. As the K1 / k value decreases, the thermal runaway protection requirements that the base region 30a must fulfill increase, and accordingly, the D / d ratio may decrease, that is, the thickness requirement of the base region 30a increases. When K1 / k is sufficiently small, the thermal runaway protection requirement that the substrate region 30a must fulfill is relatively large, there is a minimum value in D / d, i.e., there is a maximum value in d, thereby satisfying the thermal runaway protection requirement of the substrate region 30a. When K1 / k is sufficiently large, the thermal runaway protection requirement that the substrate region 30a must fulfill is relatively small, there is a maximum value in D / d, i.e., there is a minimum value in d, thereby achieving compatibility with the thermal runaway protection requirement while also being economical and reducing design redundancy.

[0178] The inventors reduce the redundancy in the size design of the protective member 30 while maintaining compatibility with thermal protection requirements by limiting the value of (K1 / k) / (D / d) to 0.04-300, thereby reducing the energy density loss of the battery 2 and improving the safety of the battery 2.

[0179] Figure 11 is a schematic diagram of one battery structure according to several other embodiments of this application.

[0180] As shown in Figure 11, in some embodiments, the protective member 30 includes a first protective plate 31 and a second protective plate 32 that are stacked and installed along the axial direction Z, with the portion where the first protective plate 31 and the second protective plate 32 overlap in the axial direction Z and the portion of the second protective plate 32 constituting a reinforcement region 30b, and the portion where the first protective plate 31 and the second protective plate 32 do not overlap in the axial direction Z constituting a base region 30a.

[0181] The material of the first protective plate 31 and the material of the second protective plate 32 may be the same or different.

[0182] The second protective plate 32 may be installed on one side of the first protective plate 31 facing the pressure release mechanism 11, or on the other side of the first protective plate 31 facing away from the pressure release mechanism 11.

[0183] The number of second protective plates 32 may be one or multiple, and the embodiments of this application are not limited thereto.

[0184] The second protective plate 32 may be a flat plate with a uniform thickness, or it may be a plate with an uneven thickness.

[0185] By laminating the first protective plate 31 and the second protective plate 32, a protective member 30 with a difference in thickness is formed, thereby simplifying the molding process of the protective member 30.

[0186] In some embodiments, the second protective plate 32 is installed on one side of the first protective plate 31 facing the pressure relief mechanism 11.

[0187] This embodiment can improve the flatness of one side of the protective member 30 that is away from the pressure release mechanism 11, and facilitates fixing the protective member 30 to other members.

[0188] In some embodiments, both the first protective plate 31 and the second protective plate 32 are flat plate structures, and the thickness direction of both the first protective plate 31 and the second protective plate 32 are parallel to the axial direction Z.

[0189] In some embodiments, the material of the second protective plate 32 is different from the material of the first protective plate 31. By using different materials for the first protective plate 31 and the second protective plate 32, and combining the properties of these different materials, a protective member 30 with higher thermal shock resistance can be constructed. Compared to the first protective plate 31 and the second protective plate 32 manufactured from the same material, the structure of the protective member 30 can be made more varied when the first protective plate 31 and the second protective plate 32 are manufactured from different materials.

[0190] In some embodiments, the thermal shock resistance of the second protective plate 32 is superior to that of the first protective plate 31.

[0191] In some embodiments, the melting point of the second protective plate 32 is higher than that of the first protective plate 31. For example, the melting point of the second protective plate 32 is higher than 1000°C. The embodiments of this application do not limit the melting point of the first protective plate 31, which may be 1000°C or higher, or 1000°C or lower.

[0192] In some embodiments, the second protective plate 32 is bonded to the first protective plate 31.

[0193] Figure 12 is a schematic diagram of one battery structure according to some other embodiments of this application.

[0194] As shown in Figure 12, in some embodiments, the first protective plate 31 has a flat plate structure, and the thickness direction of the first protective plate 31 is parallel to the axial direction Z. In the maximum size direction X perpendicular to the axial direction Z of the pressure relief hole 111, the size of the second protective plate 32 along the axial direction Z gradually decreases from the middle to both ends.

[0195] The largest portion of the second protective plate 32 along the axial direction Z may face the pressure relief hole 111, thereby reducing the risk of the protective member 30 being punctured by a relatively large thermal shock. The thermal shock received by both ends of the second protective plate 32 is relatively small, and it can have a relatively small thickness, reducing the weight and volume of the second protective plate 32 and improving the energy density of the battery 2.

[0196] In some embodiments, the second protective plate 32 has a slope on one side facing the pressure relief hole 111, which guides the flow of high-temperature, high-speed material and reduces the thermal shock experienced by the second protective plate 32.

[0197] Figure 13 is a schematic diagram of one battery structure according to some other embodiments of this application.

[0198] As shown in Figure 13, in some embodiments, there are multiple second protective plates 32, and the multiple second protective plates 32 are installed at intervals.

[0199] In some embodiments, the number of second protective plates 32 is the same as the number of reinforced areas 30b.

[0200] In some embodiments, the second protective plate 32 has a flat plate structure.

[0201] In some embodiments, multiple second protective plates 32 are installed at intervals in the maximum size direction X perpendicular to the axial direction Z of the pressure relief hole 111.

[0202] Figure 14 is a schematic diagram of one battery structure according to several other embodiments of this application.

[0203] As shown in Figure 14, in some embodiments, there are multiple second protective plates 32, and the multiple second protective plates 32 are installed at intervals or in a continuous manner.

[0204] In some embodiments, the first protective plate 31 has a flat plate structure, and the thickness direction of the first protective plate 31 is parallel to the axial direction Z. In the maximum size direction X perpendicular to the axial direction Z of the pressure relief hole 111, the size of each second protective plate 32 along the axial direction Z gradually decreases from the middle to both ends.

[0205] Figure 15 is a schematic diagram of one battery structure according to some other embodiments of this application.

[0206] As shown in Figure 15, in some embodiments, the first wall 21a may be located on the underside of the battery unit 10.

[0207] According to some embodiments of this application, the application further provides a power consumption device comprising a battery of any one of the above embodiments, the battery being used to provide electrical energy to the power consumption device. The power consumption device may be any one of the above-described devices or systems that utilizes the battery.

[0208] Referring to some embodiments of this application, specifically Figures 3 to 7, this application provides a battery 2 comprising a housing 20, a battery unit 10, and a protective member 30. The battery unit 10 is housed within the housing 20. The housing 20 includes a first wall 21a located above the battery unit 10. The battery unit 10 is provided with a pressure relief mechanism 11, which is used to release material inside the battery unit 10 by forming a pressure relief hole 111.

[0209] The protective member 30 is housed within the housing 20 and fixed to the first wall 21a. At least a portion of the protective member 30 is located between the first wall 21a and the pressure relief mechanism 11 and is used to cover the pressure relief hole 111 in the axial direction Z of the pressure relief hole 111. In any direction perpendicular to the axial direction Z, the size of the protective member 30 is always larger than the size of the pressure relief hole 111.

[0210] The minimum size of the portion of the protective member 30 that covers the pressure relief hole 111 in the axial direction Z is D, and the maximum temperature of the substance released by the battery unit 10 through the pressure relief hole 111 is T, where D and T are equal to 5 × 10 -4 mm / ℃ ≤ D / T ≤ 5.3 × 10 -3 Meets the mm / °C requirement.

[0211] The present application will be further described below, with reference to examples.

[0212] To further clarify the purpose of the invention, the technical proposal, and the beneficial technical effects of this application, the application will be described in more detail below, with reference to examples. However, it should be understood that the examples of this application are for interpretive purposes only and do not limit this application, and the examples of this application are not limited to those shown in the specification. Unless specific experimental or operating conditions are specified in the examples, the products are manufactured under normal conditions or under conditions recommended by the material supplier.

[0213] Example 1: (i) Manufacture a rectangular battery unit with a length l1 of 220 mm, a width l2 of 44 mm, and a height l3 of 100 mm.

[0214] (ii) The battery unit is placed in a sealed enclosure, and a protective member is attached to the wall of the enclosure located above the battery unit (hereinafter referred to as the first wall). The protective member is used to face the pressure relief mechanism of the battery unit and to cover the pressure relief holes. The protective member is a flat plate with a thickness D of 0.5 mm, and is made of a composite plate composed of boron nitride and carbon fiber. In the axial direction of the pressure relief hole, the distance h between the protective member and the pressure relief hole is 15 mm.

[0215] (iii) A first temperature sensor is installed on the surface of the protective member facing the pressure relief hole, and a second temperature sensor is installed on the surface of the protective member away from the pressure relief hole. Each sensor can, for example, detect the temperature of multiple locations.

[0216] (iv) Trigger thermal runaway in the battery unit inside the housing, causing the battery unit to form pressure relief holes and release material to the outside. During the thermal runaway process of the battery unit, the highest temperature detected by the first temperature sensor is recorded and recorded as the highest temperature T of the material released by the battery unit, and the highest temperature T1 detected by the second temperature sensor is also recorded.

[0217] (v) After the thermal runaway of the battery unit has stopped, open the casing and check whether the protective material has been punctured.

[0218] Example 2-10: The test method for Example 2-10 is the same as in Example 1. The differences between Example 2-10 and Example 1 are shown in Table 1. For example, the maximum temperature of the substance released by the battery unit may be changed by altering the chemical system of the battery unit.

[0219] Comparative Example 1-4: The test method for Comparative Example 1-4 is as shown in Table 1, referring to Example 1. The differences between Comparative Example 1-4 and Example 1 are as shown in Table 1.

[0220] [Table 1]

[0221] Referring to Examples 1-10 and Comparative Examples 1-2, the embodiments of this application have a D / T value of 5 × 10 -4 By limiting the temperature to mm / °C or higher, the risk of the protective material being penetrated can be reduced, thus meeting the thermal protection requirements for the battery.

[0222] Referring to Examples 1-10 and Comparative Examples 3-4, the protective member can block the conduction of heat, reduce the amount of heat transferred to the housing, and lower the temperature of the housing. When the D / T ratio becomes large enough, the temperature of the housing can be made to meet the requirements. In this example, the D / T value is set to 5.3 × 10⁻⁶. -3 By limiting the temperature to mm / °C or less, redundancy in the size design of protective components is reduced, the loss of energy density in the battery is minimized, and the safety of the battery is improved.

[0223] Example 11: (i) A rectangular battery unit is manufactured, with a length l1 of 220 mm, a width l2 of 44 mm, and a height l3 of 100 mm. The volumetric energy density E of the battery unit is 500 Wh / L.

[0224] (ii) The battery unit is placed in a sealed enclosure, and a protective member is attached to the first wall of the enclosure located above the battery unit. The protective member is used to face the pressure relief mechanism of the battery unit and to cover the pressure relief holes. The protective member is a flat plate with a thickness D of 5 mm and is made of a composite plate composed of boron nitride and carbon fiber. The distance h between the protective member and the pressure relief holes in the axial direction of the pressure relief holes is 15 mm.

[0225] (iii) A third temperature sensor is installed on the surface of the protective member away from the pressure relief hole. For example, the third temperature sensor can detect the temperature of multiple locations.

[0226] (iv) Trigger thermal runaway in the battery unit inside the enclosure, causing pressure relief holes to form in the battery unit and releasing material to the outside. Record the highest temperature T1 detected by the third temperature sensor.

[0227] (v) After the thermal runaway of the battery unit has stopped, open the casing and check whether the protective material has been punctured.

[0228] Examples 12-16: The test method for Example 12-16 is the same as in Example 11. The differences between Example 12-16 and Example 11 are shown in Table 2.

[0229] Comparative Example 5-8: The test method for Comparative Example 5-8 is as shown in Table 2, referring to Example 11.

[0230] [Table 2]

[0231] Referring to Examples 11-16 and Comparative Examples 5-6, the embodiments of this application have a D / E value of 1 × 10⁻⁶. -3 By limiting the temperature to mm·L / Wh or higher, the risk of the protective material being penetrated can be reduced, thus meeting the thermal protection requirements for the battery.

[0232] Referring to Examples 11-16 and Comparative Examples 7-8, the protective member can block the conduction of heat, reduce the amount of heat transferred to the housing, and lower the temperature of the housing. When the D / E ratio becomes large enough, the temperature of the housing can be made to meet the requirements. In this example, the D / E value is set to 10 × 10 -3 By limiting the energy density to mm·L / Wh or less, the redundancy in the size design of protective components is reduced, the loss of energy density in the battery is minimized, and the safety of the battery is improved.

[0233] Example 17: (i) Manufacture a rectangular battery unit with a length l1 of 220 mm, a width l2 of 44 mm, and a height l3 of 100 mm.

[0234] (ii) The battery unit is placed in a sealed enclosure, and a protective member is attached to the first wall of the enclosure located above the battery unit. The protective member is used to face the pressure relief mechanism of the battery unit and to cover the pressure relief holes. The protective member is a flat plate with a thickness D of 2 mm and is made of a composite plate composed of boron nitride and carbon fiber. In the axial direction of the pressure relief hole, the distance h between the protective member and the pressure relief hole is 15 mm. In the maximum size direction perpendicular to the axial direction of the pressure relief hole, the size k of the pressure relief hole is 60 mm. In the maximum size direction of the pressure relief hole, the size K of the protective member is 120 mm.

[0235] (iii) A fourth temperature sensor is installed on the surface of the protective member facing the pressure relief hole, and a fifth temperature sensor is installed in the area of ​​the first wall that is close to the edge along the maximum size direction of the protective member and is not covered by the protective member. Exemplarily, each temperature sensor can detect the temperature of multiple locations.

[0236] (iv) Trigger thermal runaway in the battery unit inside the housing, causing the battery unit to form pressure relief holes and release material to the outside. During the thermal runaway process of the battery unit, the highest temperature detected by the fourth temperature sensor is recorded and recorded as the highest temperature T of the material released by the battery unit, and the highest temperature T2 detected by the fifth temperature sensor is recorded.

[0237] (v) After the thermal runaway of the battery unit has stopped, open the casing and check whether the protective material has been punctured.

[0238] Examples 18-23: The test method for Examples 18-23 is the same as in Example 17. The differences between Examples 18-23 and Example 17 are shown in Table 3. For example, the maximum temperature of the substance released by the battery unit may be changed by altering the chemical system of the battery unit.

[0239] Comparative Example 9-11: The test method for Comparative Example 9-11 is as shown in Table 3, referring to Example 17.

[0240] [Table 3]

[0241] Referring to Examples 17-23 and Comparative Example 9, when K=k, some of the material released through the pressure relief holes may diverge and act on areas of the first wall not covered by the protective member, potentially raising the temperature of the first wall to a relatively high level. The embodiments of this application preferably increase K to be greater than k, thereby increasing the protective area of ​​the protective member, reducing the risk of released material directly impacting the first wall, lowering the temperature of the first wall, and improving safety.

[0242] Referring to Examples 17-23 and Comparative Examples 10-11, the embodiments of this application have a value of (K / k) / T of 1 × 10⁻⁶. -3 By limiting the temperature to above / ℃, the risk of damage to the first wall is reduced by keeping the temperature of the part of the first wall not shielded by the protective member within a certain range.

[0243] Example 24: (i) Manufacture a rectangular battery unit with a length l1 of 220 mm, a width l2 of 44 mm, and a height l3 of 100 mm.

[0244] (ii) The battery unit is placed in a sealed enclosure, and a protective member is attached to the first wall of the enclosure located above the battery unit. The protective member is used to face the pressure release mechanism of the battery unit and to cover the pressure release holes. The protective member has a thicker structure in the middle, that is, the protective member includes a reinforced area in the middle and base areas on both sides, with a thickness D of 3 mm for the reinforced area and a thickness of 1.5 mm for the base areas. The material of the protective member is a composite plate made of boron nitride and carbon fiber. In the axial direction of the pressure release hole, the reinforced area faces the pressure release hole, and the distance h between the reinforced area and the pressure release hole is 15 mm. In the direction of the maximum size of the pressure release hole, the size k of the pressure release hole is 50 mm, the size K of the protective member is 180 mm, the size K1 of the reinforced area is 60 mm, and the size of each base area is 60 mm.

[0245] (iii) A sixth temperature sensor is installed on the surface of the reinforcement region facing the pressure relief hole, and a seventh temperature sensor is installed on the surface of the substrate region away from the pressure relief hole. Each temperature sensor can, for example, detect the temperature of multiple locations.

[0246] (iv) Trigger thermal runaway in the battery unit inside the housing, causing the battery unit to form pressure relief holes and release material to the outside. During the thermal runaway process of the battery unit, the highest temperature detected by the sixth temperature sensor is recorded and recorded as the highest temperature T of the material released by the battery unit, and the highest temperature T3 detected by the seventh temperature sensor is recorded.

[0247] (v) After the thermal runaway of the battery unit has stopped, open the casing and check whether the protective material has been punctured.

[0248] Examples 25-29: The test method for Examples 25-29 is as described in Example 24. The differences between Examples 25-29 and Example 24 are shown in Table 4.

[0249] Comparative Examples 12-13: The test method for Comparative Examples 12-13 is as shown in Example 24. The differences between Comparative Examples 12-13 and Example 24 are shown in Table 4.

[0250] [Table 4]

[0251] Referring to Examples 24-29 and Comparative Examples 12-13, the embodiments of this application have a value of (K / K1) / T of 3 × 10 -3 By limiting the temperature to below / °C, the reinforcing region and the substrate region block the high-temperature, high-speed material, reducing the amount of heat transferred to the first wall and thus lowering the temperature of the first wall.

[0252] It should be noted that, as long as they do not conflict, the embodiments and features of the embodiments in this application may be combined with each other.

[0253] Finally, it should be noted that the above embodiments are merely for illustrative purposes and not limiting purposes, and although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that it is still possible to modify the inventions described in each of the above embodiments or to make equivalent substitutions to some of their technical features, but such modifications or substitutions will not cause the essence of the corresponding inventions to deviate from the spirit and scope of the inventions in each of the embodiments of this application.

Claims

1. It is a battery, The enclosure, including the first wall, A battery unit housed within the aforementioned housing, wherein the battery unit is provided with a pressure release mechanism, and the pressure release mechanism is used to form a pressure release hole and release material inside the battery unit, A protective member housed within the housing, wherein at least a portion of the protective member is located between the first wall and the pressure relief mechanism and is used to cover the pressure relief hole in the axial direction of the pressure relief hole. Here, the minimum size of the portion of the protective member that covers the pressure relief hole in the axial direction is D, the maximum temperature of the substance released by the battery unit through the pressure relief hole is T, and D and T are 5 x 10 －４ mm / ℃≦D / T≦1.5×10 －３ Satisfying mm / ℃, In the direction of maximum size perpendicular to the axial direction of the pressure relief hole, the size of the pressure relief hole is k, and the size of the protective member along the direction of maximum size is K, where k, K and T are K>k, (K / k) / T≧1×10 －３ Includes a protective member that satisfies / ℃, The volumetric energy density of the aforementioned battery unit is E, and D and E are, A battery that satisfies the conditions 1 × 10⁻³ mm·L / Wh ≤ D / E ≤ 1 × 10⁻² mm·L / Wh.

2. D and T are, 5 x 10 －４ mm / ℃≦D / T≦3.3×10 －３ The battery according to claim 1, satisfying mm / °C.

3. The battery according to claim 1, wherein the value of D is 0.5 mm - 5 mm.

4. The battery according to claim 1, wherein in any direction perpendicular to the axial direction, the size of the protective member is greater than the size of the pressure relief hole.

5. D and E are, 1 x 10 －３ mm・L / Wh≦D / E≦6×10 －３ A battery according to claim 1, satisfying mm·L / Wh.

6. k, K, and T are, (K / k) / T≧2×10 －３ A battery according to claim 1, satisfying the temperature / °C requirement.

7. k, K, and T are, (K / k) / T ≤ 2.7×10 －１ / °C, the battery according to claim 1.

8. The minimum distance in the axial direction between the protective member and the pressure relief hole is h, and h and D are The battery according to claim 1, satisfying 0.2 ≤ h / D ≤ 250.

9. The battery according to any one of claims 1 to 8, wherein the protective member has a flat plate structure, and the thickness direction of the protective member is parallel to the axial direction.

10. In the direction of the maximum size of the pressure relief hole perpendicular to the axial direction, the thickness of the protective member gradually decreases from the middle to both sides, and the thickness direction of the protective member is parallel to the axial direction. The battery according to any one of claims 1 to 8, wherein the portion of the protective member with the greatest thickness covers at least a portion of the pressure relief hole in the axial direction.

11. The protective member includes a base region and a reinforcing region connected to the base region, wherein the size of the reinforcing region along the axial direction is larger than the size of the base region along the axial direction. In the axial direction, the reinforcing region covers at least a portion of the pressure relief hole, as described in any one of claims 1 to 8.

12. The battery according to claim 11, wherein in the axial direction, the reinforcing region completely covers the pressure relief hole.

13. In the direction of maximum size perpendicular to the axial direction of the pressure relief hole, the size of the protective member is K, and the size of the reinforcement area is K １ And, K_K １ And T is, K > K １ , (K / K １ ) / T ≤ 3 × 10 －３ The battery according to claim 12, which satisfies / ℃.

14. The battery according to claim 12, wherein both the reinforcing region and the base region are flat plate structures, and the thickness direction of both the reinforcing region and the base region are parallel to the axial direction.

15. The size of the reinforcement region along the axial direction is D, and the size of the base region along the axial direction is d. In the direction of maximum size perpendicular to the axial direction of the pressure relief hole, the size of the pressure relief hole is k, and the size of the reinforcement region is K. １ And, D, d, k, and K １ 0.04 ≤ (K １ The battery according to claim 14, satisfying (k) / (D / d) ≤ 300.

16. The battery according to claim 11, wherein the protective member includes a first protective plate and a second protective plate installed in a stack along the axial direction, the portion where the first protective plate and the second protective plate overlap in the axial direction and the second protective plate constitute the reinforcement region, and the portion where the first protective plate and the second protective plate do not overlap in the axial direction constitutes the base region.

17. The battery according to claim 16, wherein the second protective plate is installed on one side of the first protective plate facing the pressure release mechanism.

18. The battery according to claim 16, wherein the second protective plate is a plurality of plates, and the plurality of second protective plates are installed at intervals.

19. The battery according to claim 18, wherein a plurality of the second protective plates are installed at intervals in the direction of the maximum size perpendicular to the axial direction of the pressure relief hole.

20. The battery according to claim 16, wherein both the first protective plate and the second protective plate are flat plate structures, and the thickness direction of both the first protective plate and the second protective plate are parallel to the axial direction.

21. The first protective plate has a flat plate structure, and the thickness direction of the first protective plate is parallel to the axial direction. The battery according to claim 16, wherein, in the direction of the maximum size of the pressure relief hole perpendicular to the axial direction, the size of the second protective plate along the axial direction gradually decreases from the middle to both ends.

22. The battery according to claim 16, wherein the material of the second protective plate is different from the material of the first protective plate.

23. The battery according to any one of claims 1 to 8, wherein the first wall is located above or below the battery unit.

24. The battery according to any one of claims 1 to 8, wherein the melting point of the protective member is higher than 1000°C.

25. The battery according to any one of claims 1 to 8, wherein the melting point of the protective member is higher than the melting point of the first wall.

26. The protective member is fixed to the first wall, the battery according to any one of claims 1 to 8.

27. The battery according to claim 26, wherein the protective member is fixed to the first wall by adhesive, welding, fastening, or locking.

28. A power consumption device comprising a battery for providing electrical energy as described in any one of claims 1 to 8.

Images