Battery and power consuming device

Abstract

The application discloses a battery and a power utilization device. The battery comprises a battery monomer, the battery monomer comprises a shell and a pressure relief mechanism, the pressure relief mechanism is arranged on a first wall of the shell; a blocking piece is arranged opposite to the first wall along the thickness direction of the first wall, the projection of the blocking piece on the first wall covers at least a part of the pressure relief mechanism, and an exhaust gap is formed between the blocking piece and the first wall; wherein the size of the exhaust gap is D, the capacity of the battery monomer is C, and 0.01≤D / C≤0.14 is met, the unit of D is mm, and the unit of C is Ah. The technical scheme provided by the application can ensure that the battery has high energy density and high safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery technology, in addition to improving the energy density of the battery, safety is also an issue that cannot be ignored. Therefore, how to improve the safety of the battery is a technical problem that needs to be solved in battery technology. SUMMARY

[0004] The present application provides a battery and a power utilization device, which can ensure that the battery has high energy density while having high safety.

[0005] The present application is achieved by the following technical solutions:

[0006] In a first aspect, the present application provides a battery, comprising: a battery monomer, the battery monomer comprising a shell and a pressure relief mechanism, the pressure relief mechanism being arranged on a first wall of the shell; a blocking piece, arranged opposite to the first wall along the thickness direction of the first wall, the projection of the blocking piece on the first wall covering at least a part of the pressure relief mechanism, and an exhaust gap being formed between the blocking piece and the first wall; wherein the size of the exhaust gap is D, the capacity of the battery monomer is C, and 0.01≤D / C≤0.14 is satisfied, the unit of D being mm, and the unit of C being Ah.

[0007] In the above-mentioned solution, when the battery monomer is in thermal runaway, a large amount of high-temperature gas is generated inside the battery monomer due to chemical and electrochemical reactions. The high-temperature gas is discharged from the pressure relief mechanism to the outside of the shell along the thickness direction of the first wall under the action of the pressure inside the battery monomer, so as to reduce the risk of explosion of the battery.

[0008] The high-temperature gas is blocked by the blocking piece (the first position encountered by the high-temperature gas after the battery cell is exhausted), the blocking piece causes the speed of the high-temperature gas to decrease, and even causes backflow, thereby affecting the exhaust efficiency of the battery cell, causing the gas inside the battery cell to be exhausted in a timely manner, wherein the closer the blocking piece is to the pressure relief mechanism, that is, the smaller the exhaust gap D, the greater the impact on the exhaust efficiency, the less timely the exhaust, and the greater the impact of the backflow of heat on the adjacent battery cell, and even the greater the risk of explosion of the battery. Conversely, the farther the blocking piece is from the pressure relief mechanism, that is, the larger the exhaust gap D, the smaller the impact on the exhaust efficiency, the more timely the exhaust, and the smaller the risk of explosion of the battery. At the same time, the exhaust gap D is related to the energy density of the battery, and the smaller the exhaust gap D, the greater the energy density of the battery, and vice versa.

[0009] At the same time, the greater the capacity C of the battery cell, the greater the amount of high-temperature gas generated by the thermal runaway of the battery cell, and the greater the exhaust gap D required to reduce the risk of explosion of the battery. Therefore, the exhaust gap D in the battery and the capacity C of the battery cell affect the safety and energy density of the battery, wherein when D / C>0.14 (the unit of D is mm, and the unit of C is Ah), the exhaust gap D is too large, causing waste of internal space of the battery and affecting the energy density of the battery; when D / C<0.01 (the unit of D is mm, and the unit of C is Ah), the exhaust gap D is insufficient, and the high-temperature gas inside the battery cell cannot be exhausted in a timely manner after the thermal runaway of the battery cell, causing the shell to be broken or even the battery to explode. Therefore, the battery provided in the present application satisfies 0.01≤D / C≤0.14 (the unit of D is mm, and the unit of C is Ah), so that the battery has a high energy density under the condition of high safety.

[0010] According to some embodiments of the present application, 0.02≤D / C≤0.08 is satisfied.

[0011] In the above scheme, the battery satisfies 0.02≤D / C≤0.08, to further limit the ratio relationship between the exhaust gap D of each battery cell in the battery and the capacity C of the battery cell, to optimize the internal space of the battery, so that the battery has high safety and high energy density.

[0012] According to some embodiments of the present application, 0.03≤D / C≤0.05 is satisfied.

[0013] In the above scheme, the battery satisfies 0.03≤D / C≤0.05, to further limit the ratio relationship between the exhaust gap D of each battery cell in the battery and the capacity C of the battery cell, to balance the safety and energy density of the battery, so that the battery has a higher energy density under the condition of ensuring the safety of the battery.

[0014] According to some embodiments of the present application, the shell further comprises a second wall, two third walls and two fourth walls, the first wall and the second wall are oppositely arranged along a first direction, the two third walls are oppositely arranged along a second direction, the two fourth walls are oppositely arranged along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the area of the first wall, the area of the second wall and the area of the third wall are all less than the area of the fourth wall.

[0015] In the above scheme, the battery monomer is a square battery monomer, the area of the first wall, the area of the second wall and the area of the third wall are all less than the area of the fourth wall, so the surface of the fourth wall is the large surface of the battery monomer.

[0016] According to some embodiments of the present application, the battery further comprises a box, the battery monomer is arranged in the box, the box comprises a top wall, a bottom wall and a side wall, the top wall and the bottom wall are oppositely arranged along the third direction, the side wall is arranged around the bottom wall, and the side wall connects the top wall and the bottom wall.

[0017] In the above scheme, the battery monomer is arranged in the box and is protected by the top wall, the bottom wall and the side wall, so that the influence of external objects on the battery monomer can be prevented and the normal work of the battery can be ensured.

[0018] Among them, the third direction is the height direction of the box, that is, the plane where the fourth wall of the battery monomer is parallel to the plane where the top wall or the bottom wall is located, at this time the battery monomer can be regarded as lying in the box.

[0019] According to some embodiments of the present application, the size of the battery monomer in the third direction is X, which satisfies 0.1≤D / X≤1, and the unit of X is mm.

[0020] In the above scheme, the third direction is the direction opposite to the two large surfaces of the battery monomer, and the size X of the battery monomer in the third direction can also be regarded as the thickness size of the battery monomer. The thickness of the battery monomer is related to the capacity of the battery monomer, the larger the capacity of the battery monomer is, the thicker the battery monomer can be, so the thickness of the battery monomer affects the energy density and safety of the battery. Among them, when D / X>1(X unit: mm), there is a problem that the exhaust gap D is too large, which causes waste of internal space of the battery and affects the energy density of the battery; when D / X is less than 0.1(X unit: mm), there is a problem that the exhaust gap D is insufficient, after the battery monomer is out of control, the high-temperature gas in the battery monomer cannot be discharged in time, which causes the shell to be broken or even the battery to explode. Therefore, in the present application, when the battery monomer is arranged horizontally, the battery monomer satisfies 0.1≤D / X≤1(X unit: mm) under the condition that the battery has high safety and high energy density.

[0021] According to some embodiments of the present application, 0.1≤D / X≤0.5 is satisfied.

[0022] In the above scheme, the battery satisfies 0.1≤D / X≤0.5, so as to further limit the ratio of the exhaust gap D of each battery monomer and the thickness (the size X of the battery monomer in the third direction) of the battery monomer, so as to optimize the battery, so that the battery has higher safety and higher energy density.

[0023] According to some embodiments of the present application, 0.25≤D / X≤0.45 is satisfied.

[0024] In the above scheme, the battery satisfies 0.25≤D / X≤0.45, which further limits the ratio of the exhaust gap D of each battery monomer and the thickness of the battery monomer, balances the safety and energy density of the battery, and has higher energy density under the condition of ensuring the safety of the battery.

[0025] According to some embodiments of the present application, the size of the battery monomer in the first direction is H, and 0.05≤D / H≤0.5 is satisfied, and the unit of H is mm.

[0026] In the above scheme, the first direction is the direction opposite to the first wall and the second wall, and the pressure relief mechanism is arranged on the first wall. The size H of the battery monomer in the first direction can also be regarded as the height size of the battery. The height of the battery monomer is related to the capacity of the battery monomer. The larger the capacity of the battery monomer is, the higher the battery monomer can be, so the height of the battery monomer affects the energy density and safety of the battery. When D / H>0.5 (the unit of H is mm), there is a problem that the exhaust gap D is too large, which causes waste of the internal space of the battery and affects the energy density of the battery. When D / H is less than 0.05 (the unit of H is mm), there is a problem that the exhaust gap D is insufficient, and after the battery monomer is out of control, the high-temperature gas in the battery monomer cannot be discharged in time, which causes the shell to be broken or even the battery to explode. Therefore, in the present application, the battery monomer satisfies 0.05≤D / H≤0.5 (the unit of H is mm), so that the battery has higher energy density under the condition of higher safety.

[0027] According to some embodiments of the present application, 0.05≤D / H≤0.25 is satisfied.

[0028] In the above scheme, the battery satisfies 0.05≤D / H≤0.25, so as to further limit the ratio of the exhaust gap D of each battery monomer and the height (the size H of the battery monomer in the first direction) of the battery monomer, so as to optimize the battery, so that the battery has higher safety and higher energy density.

[0029] According to some embodiments of the present application, 0.13≤D / H≤0.23 is satisfied.

[0030] In the above scheme, the battery satisfies 0.13≤D / H≤0.23, and the ratio of the exhaust gap D of each battery monomer and the height of the battery monomer is further limited, balancing the safety and energy density of the battery, and under the condition of ensuring the safety of the battery, the battery has a higher energy density.

[0031] According to some embodiments of the present application, the size of the battery monomer in the second direction is L, and 0.03≤D / L≤0.3 is satisfied, and the unit of L is mm.

[0032] In the above scheme, the second direction is the direction opposite to the two second walls. The size L of the battery monomer in the second direction can also be regarded as the length size of the battery. The length of the battery monomer is related to the capacity of the battery monomer, and the larger the capacity of the battery monomer, the longer the battery monomer can be, so the length of the battery monomer affects the energy density and safety of the battery. Among them, when D / L>0.3, there is a problem that the exhaust gap D is too large, resulting in waste of internal space of the battery, affecting the energy density of the battery; when D / L is less than 0.03, there is a problem that the exhaust gap D is insufficient, and after the battery monomer is out of control, the high-temperature gas in the internal cannot be discharged in time, causing the shell to rupture and even the battery to explode. Therefore, in the present application, the battery monomer satisfies 0.03≤D / L≤0.3 (the unit of L is mm), so that the battery has a higher energy density under the condition of having a higher safety.

[0033] According to some embodiments of the present application, 0.03≤D / L≤0.17 is satisfied.

[0034] In the above scheme, the battery satisfies 0.03≤D / L≤0.17, so as to further limit the ratio of the exhaust gap of each battery monomer and the length of the battery monomer (the size L of the battery monomer in the second direction), so as to optimize the battery, so that the battery has a higher safety and a higher energy density.

[0035] According to some embodiments of the present application, 0.08≤D / L≤0.15 is satisfied.

[0036] In the above scheme, the battery satisfies 0.08≤D / L≤0.15, and the ratio of the exhaust gap D of each battery monomer and the length of the battery monomer is further limited, balancing the safety and energy density of the battery, and under the condition of ensuring the safety of the battery, the battery has a higher energy density.

[0037] According to some embodiments of the present application, the battery further comprises a box, the battery cell is arranged in the box, and an exhaust volume in the box is V, satisfying 0.1≤V / C≤1.4, the unit of V is mm 3 .

[0038] In the above scheme, the box of the battery generally has good sealing performance to prevent water and dust. When the battery cell is in thermal runaway, the box needs to have enough space to accommodate high-temperature gas, i.e., an exhaust volume V (unit: mm 3 ). If the exhaust volume is too small, there is a risk of box rupture or battery explosion, but if the exhaust space is too large, it indicates that there is a problem of space waste in the box, which affects the energy density of the battery. When V / C>1.4, the exhaust volume V is too large, resulting in space waste in the box and affecting the energy density of the battery. When V / C<0.1, the exhaust volume V is insufficient to accommodate the gas discharged after the battery cell is in thermal runaway, resulting in excessive internal pressure of the box, causing the box to rupture or explode. Therefore, the battery provided in the present application satisfies 0.1≤V / C≤1.4, so that the battery has high energy density under the condition of high safety.

[0039] According to some embodiments of the present application, 0.2≤V / C≤0.8 is satisfied.

[0040] In the above scheme, the battery satisfies 0.2≤V / C≤0.8, which further limits the ratio of the exhaust volume V in the battery to the capacity C of the battery cell, so as to optimize the internal space of the battery, so that the battery has high safety and high energy density.

[0041] According to some embodiments of the present application, 0.3≤V / C≤0.5 is satisfied.

[0042] In the above scheme, the battery satisfies 0.3≤V / C≤0.5, which further limits the ratio of the exhaust volume V in the battery to the capacity C of the battery cell, so as to balance the safety and energy density of the battery, so that the battery has higher energy density under the condition of ensuring the safety of the battery.

[0043] According to some embodiments of the present application, the projection of the blocking piece on the first wall completely covers the pressure relief mechanism.

[0044] In the above scheme, the blocking piece is further limited, i.e., the projection of the blocking piece on the first wall needs to completely cover the pressure relief mechanism, so as to ensure the accuracy of the D / C, D / X, D / H, D / L, and V / C limit ranges.

[0045] According to some embodiments of the present application, the blocking piece has a first surface facing the first wall, and the area of the first surface is greater than the area of the first wall.

[0046] In the above solution, the blocking member is further limited, i.e. the area of the first surface of the blocking member is greater than the area of the first wall, so as to ensure the accuracy of the D / C, D / X, D / H, D / L and V / C defined ranges.

[0047] According to some embodiments of the present application, the battery further comprises a box, the battery cell is arranged in the box, and the blocking member is a wall of the box.

[0048] In the above solution, the case where the blocking member is a wall of the box is limited, i.e. there is no other component capable of blocking the flow of high-temperature gas between the pressure relief mechanism and the wall of the box, i.e. the high-temperature gas discharged by the battery cell is first blocked by the wall of the box.

[0049] According to some embodiments of the present application, the battery further comprises a box, the battery cell and the blocking member are arranged in the box.

[0050] In the above solution, the case where the blocking member is not a wall of the box is limited, i.e. there is another component capable of blocking the flow of high-temperature gas between the pressure relief mechanism and the wall of the box, i.e. the high-temperature gas discharged by the battery cell is first blocked by the blocking member between the pressure relief mechanism and the wall of the box.

[0051] According to some embodiments of the present application, the blocking member is a thermal management component, and the thermal management component is used to contain a medium to adjust the temperature of the battery cell.

[0052] In the above solution, the case where the blocking member is a thermal management component is limited, i.e. there is no other component capable of blocking the flow of high-temperature gas between the pressure relief mechanism and the thermal management component, i.e. the high-temperature gas discharged by the battery cell is first blocked by the thermal management component.

[0053] According to some embodiments of the present application, the blocking member is a structural beam.

[0054] In the above solution, the structural beam is a structure arranged in the box, which can have the effect of improving the structural strength of the box or fastening the battery cell. In this solution, the blocking member is a structural beam, i.e. there is no other component capable of blocking the flow of high-temperature gas between the pressure relief mechanism and the structural beam, i.e. the high-temperature gas discharged by the battery cell is first blocked by the structural beam.

[0055] In a second aspect, the present application further provides a power utilization device, comprising the battery of any one of the first aspect, and the battery is used to provide electric energy.

[0056] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0058] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0059] Figure 2 The schematic diagram of a battery is provided for some embodiments of the present application;

[0060] Figure 3 The schematic diagram of a battery cell is provided for some embodiments of the present application;

[0061] Figure 4 The schematic diagram of a battery cell and a box is provided for some embodiments of the present application;

[0062] Figure 5 The side view of a battery cell is provided for some embodiments of the present application;

[0063] Figure 6 The front view of a battery cell is provided for some embodiments of the present application;

[0064] Figure 7 The schematic diagram of a battery is provided for some other embodiments of the present application.

[0065] Legend: 100 - battery; 10 - battery cell; 11 - shell; 110 - first wall; 111 - second wall; 112 - third wall; 113 - fourth wall; 12 - pressure relief mechanism; 13 - electrode terminal; 20 - barrier; 30 - box; 31 - top wall; 32 - bottom wall; 33 - side wall; 40 - thermal management component; x - first direction; y - second direction; z - third direction; 1000 - vehicle; 200 - controller; 300 - motor. DETAILED DESCRIPTION

[0066] The embodiments of the present application will be further described in detail below in combination with the drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e. the present application is not limited to the described embodiments.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims hereof, along with their variants, are intended to be equivalent to the term "consisting of." The use of the term "about" in relation to a geographic location refers to a location within a 10 km radius of the geographic location.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0069] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, or necessarily alternatives to other embodiments. It will be explicitly and implicitly appreciated by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0070] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of existence of A, existence of A and B, and existence of B. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0071] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0072] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "upper", "lower", etc. indicate the orientation or positional relationship shown in the drawings, which is only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0073] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0074] In the present application, the battery refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0075] The battery cell comprises a housing, a pressure relief mechanism, an electrode assembly and an electrolyte, the electrode assembly and the electrolyte are arranged inside the housing, and the pressure relief mechanism is arranged on a first wall of the housing. The electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly works by moving metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab comprises a positive current collector and a positive active material layer, the positive active material layer is coated on the surface of the positive current collector, and the current collector without the positive active material layer protrudes from the current collector with the positive active material layer, and the current collector without the positive active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab comprises a negative current collector and a negative active material layer, the negative active material layer is coated on the surface of the negative current collector, and the current collector without the negative active material layer protrudes from the current collector with the negative active material layer, and the current collector without the negative active material layer serves as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that the fuse does not occur when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene) or the like.

[0076] The pressure relief mechanism refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a threshold. The pressure relief mechanism can take the form of a pressure relief valve, a gas valve, a pressure relief valve or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell reaches a threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or passage for the internal pressure or temperature to be released.

[0077] "Actuate" as mentioned in the present application refers to the action or activation of the pressure relief mechanism to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action of the pressure relief mechanism can include but is not limited to: at least part of the pressure relief mechanism is broken, broken, torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure gas in the battery cell will be discharged outward from the actuated part. In this way, the battery cell can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0078] The development of battery technology needs to consider various design factors, such as energy density, discharge capacity, charge-discharge rate, and other performance parameters, and the safety of the battery. Therefore, how to ensure the energy density of the battery while making the battery have high safety is a technical problem that needs to be solved in the battery technology.

[0079] The inventors found that in order to reduce the safety risk caused by thermal runaway of the battery, the energy density of the battery is generally sacrificed to maximize the space above the pressure relief mechanism to ensure that the high-temperature and high-pressure gas generated inside the battery cell is discharged in time and unobstructed. However, at present, although the space above the pressure relief mechanism is increased, the risk of safety problems caused by thermal runaway of the battery is still high. Therefore, the inventors further found that one of the reasons for the safety problems caused by thermal runaway of the battery is that the capacity of the battery cell is not considered, that is, the space above the pressure relief mechanism is not adjusted according to the capacity of the battery cell, so that the high-temperature and high-pressure gas discharged by the battery cell with large capacity due to thermal runaway is not discharged in time, resulting in low safety.

[0080] Therefore, in order to ensure the energy density of the battery and make the battery have high safety, the inventors have designed a battery after deep research, which comprises a battery cell and a blocking piece. The capacity of the battery cell is C (unit Ah). The pressure relief mechanism of the battery cell is arranged on the first wall of the shell. The blocking piece is arranged opposite to the pressure relief mechanism of the battery cell, and the high-temperature and high-pressure gas generated inside the battery cell will be blocked by the blocking piece when discharged by the pressure relief mechanism. Therefore, the space above the pressure relief mechanism can be the exhaust gap D formed between the blocking piece and the first wall. In the battery, 0.01≤D / C≤0.14 is satisfied.

[0081] The greater the exhaust gap D is, the higher the space above the pressure relief mechanism is, and the greater the unused space inside the battery is. The greater the C is, the greater the capacity of the battery monomer is, and the greater the required exhaust gap D is. When D / C>0.14, there is a problem that the exhaust gap D is too large, causing the waste of the space inside the battery and affecting the energy density of the battery. When D / C<0.01, there is a problem that the exhaust gap D is insufficient, and after the battery monomer is out of control, the high-temperature gas inside cannot be discharged in time, causing the shell to be broken or even the battery to explode. Therefore, in the present application, 0.01≤D / C≤0.14, so that the battery has high safety under the condition of high capacity density.

[0082] The battery monomer disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. A power supply system of the electric device can be composed of the battery monomer and the battery disclosed in the present application.

[0083] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy and an electric aircraft toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0084] The following embodiments are described by taking a vehicle 1000 as an example for convenience of description.

[0085] Please refer to Figure 1 , Figure 1 The vehicle 1000 provided by some embodiments of the present application is shown in the structural schematic diagram. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended vehicle. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000, which is used for the working power demand of the circuit system of the vehicle 1000, such as the starting, navigation and running of the vehicle 1000.

[0086] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0087] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0088] According to some embodiments of the present application, please refer to Figure 2 and Figure 3 , Figure 2 a schematic diagram of the battery 100 provided by some embodiments of the present application, Figure 3 a schematic diagram of the battery cell 10 in some embodiments of the present application.

[0089] The battery 100 includes a battery cell 10 and a blocking piece 20. The battery cell 10 includes a shell 11 and a pressure relief mechanism 12 arranged on a first wall 110 of the shell 11. The blocking piece 20 is arranged opposite to the first wall 110 along the thickness direction of the first wall 110, the projection of the blocking piece 20 on the first wall 110 covers at least a part of the pressure relief mechanism 12, and an exhaust gap is formed between the blocking piece 20 and the first wall 110. Wherein, the size of the exhaust gap is D, the capacity of the battery cell 10 is C, and 0.01≤D / C≤0.14 is satisfied, the unit of D is mm, and the unit of C is Ah.

[0090] In the battery 100, the battery cell 10 can be multiple, and the multiple battery cells 10 can be connected in series, in parallel or in a mixed connection. The mixed connection means that there are both series connection and parallel connection among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel or in a mixed connection. Wherein, each battery cell 10 can be a secondary battery, a primary battery, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0091] The first wall 110 is one wall of the shell 11, and the first wall 110 and other walls of the shell 11 define a space for accommodating the electrode assembly and the electrolyte. The pressure relief mechanism 12 refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The pressure relief mechanism 12 can take the form of a pressure relief valve, a gas valve, a pressure relief valve or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure. When the battery cell 10 experiences thermal runaway, the internal pressure or temperature of the battery cell 10 reaches a threshold value, the pressure relief mechanism 12 performs an action or a weak structure provided in the pressure relief mechanism 12 is broken, so that the high-temperature and high-pressure gas generated inside the battery cell 10 can be discharged.

[0092] In some embodiments, the first wall 110 can be provided with an electrode terminal 13, which can be connected to the electrode assembly inside the shell 11 to realize the charging and discharging of the battery cell 10. The electrode terminal 13 can be a pole of the battery cell 10.

[0093] The blocking member 20 is a structure in the battery 100 other than the battery cell 10, and is disposed with respect to the first wall 110 in the thickness direction of the first wall 110. The high-temperature and high-pressure gas discharged by the pressure relief mechanism 12 is blocked by the blocking member 20. The blocking member 20 can be, for example, a beam in the battery 100, a heat pipe member (water cooling plate), or a partial structure of the case 30 of the battery 100.

[0094] The thickness direction of the first wall 110 can also refer to the flow direction of the high-temperature and high-pressure gas discharged by the pressure relief mechanism 12. The discharge gap D can refer to the shortest travel of the high-temperature and high-pressure gas discharged by the pressure relief mechanism 12 to be blocked by the blocking member 20, or can refer to the minimum distance between the first wall 110 and the blocking member 20, or in some embodiments, the discharge gap D can refer to the minimum distance between the pressure relief mechanism 12 and the blocking member 20 in the thickness direction of the first wall 110.

[0095] The capacity C of the battery cell 10 refers to the size of the amount of electricity stored by the battery cell 10, and is usually expressed in ampere-hours (Ah) under certain conditions (discharge rate, temperature, terminal voltage, etc.). In some embodiments, the capacity of the battery cell 10 can be measured by a battery capacity tester. Since measuring the capacity of the battery cell 10 is a conventional technique in the battery field, those skilled in the art are aware of how to measure the capacity of the battery cell 10, and therefore this embodiment will not be described in detail.

[0096] In some embodiments, D / C can be any value between 0.01 and 0.14, such as 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, or 0.14. For example, in some embodiments, when the capacity C of the battery cell 10 is 1 Ah, the discharge gap D can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, or 0.14 mm. For example, in some embodiments, when the capacity C of the battery cell 10 is 100 Ah, the discharge gap D can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, or 14 mm.

[0097] In the above scheme, when the battery monomer 10 occurs thermal runaway, a large amount of high-temperature and high-pressure gas generated by chemical and electrochemical reactions inside the battery monomer 10 is discharged from the pressure relief mechanism 12 along the thickness direction of the first wall 110 to the shell 11. In the process of discharging the high-temperature and high-pressure gas, the high-temperature and high-pressure gas is blocked by the blocking piece 20, so that the speed of the high-temperature and high-pressure gas decreases, and even causes backflow, thereby affecting the exhaust efficiency of the battery monomer 10, and the gas inside the battery monomer 10 is not discharged in time. Among them, the closer the blocking piece 20 is to the pressure relief mechanism 12, that is, the smaller the exhaust gap D, the greater the influence on the exhaust efficiency, the less timely the exhaust, and the greater the influence of the heat backflow on the adjacent battery monomer 10, and even cause the adjacent battery monomer 10 to fail, the greater the risk of explosion of the battery 100, and vice versa. The farther the blocking piece 20 is from the pressure relief mechanism 12, that is, the larger the exhaust gap D, the smaller the influence on the exhaust efficiency, the more timely the exhaust, and the smaller the risk of explosion of the battery 100. At the same time, the exhaust gap D is related to the energy density of the battery 100, and the smaller the exhaust gap D, the greater the energy density of the battery 100, and vice versa. At the same time, the greater the capacity C of the battery monomer 10, the more high-temperature and high-pressure gas generated by the thermal runaway of the battery monomer 10, and the greater the exhaust gap D required to reduce the risk of explosion of the battery 100.

[0098] Therefore, the exhaust gap D in the battery 100 and the capacity C of the battery monomer 10 affect the safety and energy density of the battery 100. When D / C>0.14, the exhaust gap D is too large, which causes the waste of internal space of the battery 100 and affects the energy density of the battery 100. When D / C<0.01, the exhaust gap D is insufficient, and the high-temperature gas inside the battery monomer 10 cannot be discharged in time after the thermal runaway of the battery monomer 10, which causes the shell 11 to rupture or even the battery 100 to explode. Therefore, the battery 100 provided by the present application satisfies 0.01≤D / C≤0.14 (the unit of D is mm, and the unit of C is Ah), so that the battery 100 has a higher energy density under the condition of higher safety.

[0099] According to some embodiments of the present application, 0.02≤D / C≤0.08 is satisfied.

[0100] In some embodiments, D / C can be any value between 0.02 and 0.08, such as 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, or 0.08. For example, when the capacity C of the battery monomer 10 is 1 Ah, the exhaust gap D can be 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, or 0.08 mm.

[0101] In the above scheme, the battery 100 satisfies 0.02≤D / C≤0.08, so as to further limit the ratio of the exhaust gap D of each battery cell 10 in the battery 100 and the capacity C of the battery cell 10, so as to optimize the internal space of the battery 100, so that the battery 100 has higher safety and higher energy density.

[0102] According to some embodiments of the present application, 0.03≤D / C≤0.05 is satisfied.

[0103] In some embodiments, D / C can be any value between 0.03 and 0.05, such as 0.03, 0.04 or 0.05. For example, when the capacity C of the battery cell 10 is 1 Ah, the exhaust gap D can be 0.03 mm, 0.04 mm or 0.05 mm.

[0104] In the above scheme, the battery 100 satisfies 0.03≤D / C≤0.05, which further limits the ratio of the exhaust gap D of each battery cell 10 in the battery 100 and the capacity C of the battery cell 10, balances the safety and energy density of the battery 100, and makes the battery 100 have higher energy density under the condition of ensuring the safety of the battery 100.

[0105] According to some embodiments of the present application, please refer to Figure 3 , the shell 11 further includes a second wall 111, two third walls 112 and two fourth walls 113, the first wall 110 and the second wall 111 are oppositely arranged along the first direction x, the two third walls 112 are oppositely arranged along the second direction y, and the two fourth walls 113 are oppositely arranged along the third direction z, the first direction x, the second direction y and the third direction z are perpendicular to each other, and the area of the first wall 110, the area of the second wall 111 and the area of the third wall 112 are all smaller than the area of the fourth wall 113.

[0106] The shell 11 includes six walls, and each two walls are oppositely arranged, that is, the shell 11 can be a square shell 11, that is, the battery cell 10 can be a square battery cell 10.

[0107] In the battery cell 10, the largest area is called a large face, and since the area of the fourth wall 113 is larger than the area of the first wall 110, the second wall 111 and the third wall 112, the face of the fourth wall 113 is the large face of the battery cell 10.

[0108] The first direction x can be a thickness direction of the first wall 110. When the first wall 110 is a top wall of the battery cell 10, the second wall 111 can be a bottom wall of the battery cell 10, the third wall 112 and the fourth wall 113 are side walls of the battery cell 10, and the two third walls 112 and the two fourth walls 113 are arranged around the first wall 110 and the second wall 111. At this time, the first direction x can also be a height direction of the battery cell 10, the second direction y can be a length direction of the battery cell 10, and the third direction z can be a thickness direction of the battery cell 10.

[0109] According to some embodiments of the present application, please refer to Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a battery 100 according to some embodiments of the present application. The battery 100 includes a plurality of battery cells 10 and a box 30. The battery cells 10 are arranged in the box 30. The box 30 includes a top wall 31, a bottom wall 32, and a side wall 33. The top wall 31 and the bottom wall 32 are oppositely arranged along a third direction z. The side wall 33 is arranged around the bottom wall 32 and connects the top wall 31 and the bottom wall 32.

[0110] The box 30 has a space inside which can accommodate the battery cells 10 and can protect the battery cells 10. Since the top wall 31 of the box 30 and the bottom wall 32 of the box 30 are oppositely arranged along the third direction z, it can be considered that the height direction of the box 30 is the third direction z.

[0111] In the above scheme, the battery cells 10 are arranged in the box 30 and are protected by the top wall 31, the bottom wall 32, and the side wall 33, so that the battery cells 10 can be prevented from being affected by external objects and the battery 100 can work normally. In this case, the third direction z is the height direction of the box 30, that is, the plane on which the fourth wall 113 of the battery cell 10 is parallel to the plane on which the top wall 31 of the box 30 or the bottom wall 32 of the box 30 is located (the height direction of the box 30 is parallel to the thickness direction of the battery cell 10), and at this time, the battery cell 10 can be considered to lie flat in the box 30.

[0112] In other embodiments, the battery cells 10 can not lie flat in the box 30, but can lie sideways or stand in the box 30. In the scheme in which the battery cells 10 lie sideways in the box 30, the opposite direction of the top wall 31 of the box 30 and the bottom wall 32 of the box 30 can be the second direction y, that is, the height direction of the box 30 is the second direction y, and the height direction of the box 30 is parallel to the length direction of the battery cell 10; in the scheme in which the battery cells 10 stand in the box 30, the opposite direction of the top wall 31 of the box 30 and the bottom wall 32 of the box 30 can be the first direction x, that is, the height direction of the box 30 is the first direction x, and the height direction of the box 30 is parallel to the height direction of the battery cell 10.

[0113] According to some embodiments of the present application, please refer toFigure 5 , Figure 5 is a side view of the battery cell 10 in some embodiments of the present application. The size of the battery cell 10 in the third direction z is X, which satisfies 0.1≤D / X≤1, and the unit of X is mm.

[0114] The third direction z can be the thickness direction of the battery cell 10, i.e., the direction of the two opposite large surfaces. The size X of the battery cell 10 in the third direction z can be the thickness size of the battery cell 10.

[0115] In some embodiments, D / X can be any value between 0.1 and 1, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1. For example, when the size X of the battery cell 10 in the third direction z is 10 mm, the exhaust gap D can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0116] In the above scheme, the third direction z is the direction of the two opposite large surfaces of the battery cell 10, and the size X of the battery cell 10 in the third direction z can also be regarded as the thickness size of the battery cell 10. The thickness of the battery cell 10 is related to the capacity of the battery cell 10, and the larger the capacity of the battery cell 10, the thicker the battery cell 10 can be, so the thickness of the battery cell 10 affects the energy density and safety of the battery 100. When D / X>1, there is a problem that the exhaust gap D is too large, resulting in waste of internal space of the battery 100, affecting the energy density of the battery 100; when D / X is less than 0.1, there is a problem that the exhaust gap D is insufficient, and after the battery cell 10 is out of control, the high-temperature gas inside cannot be discharged in time, causing the shell 11 to rupture or even the battery 100 to explode. Therefore, in the present application, when the battery cell 10 is placed horizontally, the battery cell 10 satisfies 0.1≤D / X≤1 (X is in mm), so that the battery 100 has a higher energy density under the condition of higher safety.

[0117] According to some embodiments of the present application, 0.1≤D / X≤0.5 is satisfied.

[0118] In some embodiments, D / X can be any value between 0.1 and 0.5, such as 0.1, 0.2, 0.3, 0.4 or 0.5.

[0119] In the above scheme, the battery 100 satisfies 0.1≤D / X≤0.5, so as to further limit the ratio of the exhaust gap D of each battery cell 10 and the thickness (the size X of the battery cell 10 in the third direction z) of the battery cell 10, so as to optimize the battery 100, so that the battery 100 has higher safety and higher energy density.

[0120] According to some embodiments of the present application, 0.25≤D / X≤0.45 is satisfied.

[0121] In some embodiments, D / X can be any value between 0.25 and 0.45, such as 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31…0.4, 0.41, 0.42, 0.43, 0.44 or 0.45.

[0122] In the above scheme, the battery 100 satisfies 0.25≤D / X≤0.45, and further limits the ratio of the exhaust gap D of each battery monomer 10 and the thickness of the battery monomer 10, balances the safety and energy density of the battery 100, and has a higher energy density under the condition of ensuring the safety of the battery 100.

[0123] According to some embodiments of the present application, referring to Figure 6 , Figure 6 is a front view of the battery monomer 10 in some embodiments of the present application. The size of the battery monomer 10 in the first direction x is H, which satisfies 0.05≤D / H≤0.5, and the unit of H is mm.

[0124] The first direction x can be the height direction of the battery monomer 10, that is, the direction of the pole of the battery monomer 10, and the size H of the battery monomer 10 in the first direction x can be the height size of the battery monomer 10. In some embodiments, the height size of the battery monomer 10 can be the height size of the shell 11 of the battery monomer 10.

[0125] In some embodiments, D / H can be any value between 0.05 and 0.5, such as 0.05, 0.06, 0.07, 0.08, 0.09, 0.1…0.45, 0.46, 0.47, 0.48, 0.49 or 0.5. For example, when the size H of the battery monomer 10 in the third direction z is 20 mm, the exhaust gap D can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm…9 mm, 9.2 mm, 9.4 mm, 9.6 mm, 9.8 mm or 10 mm.

[0126] In the above scheme, the first direction x is the direction opposite to the first wall 110 and the second wall 111, and the pressure relief mechanism 12 is arranged on the first wall 110. The size H of the battery monomer 10 in the first direction x can also be regarded as the height size of the battery 100. The height of the battery monomer 10 is related to the capacity of the battery monomer 10. The larger the capacity of the battery monomer 10, the higher the battery monomer 10 can be, so the height of the battery monomer 10 affects the energy density and safety of the battery 100. Among them, when D / H>0.5, there is a problem that the exhaust gap D is too large, causing waste of the internal space of the battery 100, affecting the energy density of the battery 100; when D / H is less than 0.05, there is a problem that the exhaust gap D is insufficient, and after the battery monomer 10 is out of control, the high-temperature gas in the internal cannot be discharged in time, causing the shell 11 to rupture and even the battery 100 to explode. Therefore, in the present application, the battery monomer 10 satisfies 0.05≤D / H≤0.5 (the unit of H is mm), so that the battery 100 has a higher energy density under the condition of higher safety.

[0127] According to some embodiments of the present application, 0.05≤D / H≤0.25 is satisfied.

[0128] In some embodiments, D / H can be any value between 0.05 and 0.25, such as 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.19, 0.2, 0.21, 0.21, 0.22, 0.23, 0.24 or 0.25.

[0129] In the above scheme, the battery 100 satisfies 0.05≤D / H≤0.25, so as to further limit the ratio relationship between the exhaust gap of each battery monomer 10 and the height of the battery monomer 10 (the size H of the battery monomer 10 in the first direction x), so as to optimize the battery 100, so that the battery 100 has higher safety and higher energy density.

[0130] According to some embodiments of the present application, 0.13≤D / H≤0.23 is satisfied.

[0131] In some embodiments, D / H can be any value between 0.13 and 0.23, and D / H can be 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22 or 0.23.

[0132] In the above scheme, the battery 100 satisfies 0.13≤D / H≤0.23, which further limits the ratio relationship between the exhaust gap D of each battery monomer 10 and the height of the battery monomer 10, and balances the safety and energy density of the battery 100, so that the battery 100 has a higher energy density under the condition of ensuring the safety of the battery 100.

[0133] According to some embodiments of the present application, the size of the battery cell 10 in the second direction y is L, satisfying 0.03≤D / L≤0.3, and the unit of L is mm.

[0134] The second direction y can be the length direction of the battery cell 10, that is, the third direction z is perpendicular to the height and thickness directions of the battery cell 10, and the size L of the battery cell 10 in the second direction y can be the length size of the battery cell 10.

[0135] In some embodiments, D / L can be any value between 0.03 and 0.3, such as 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1…0.25, 0.26, 0.27, 0.28, 0.29 or 0.3. For example, in some embodiments, when the size L of the battery cell 10 in the second direction y is 40 mm, the exhaust gap D can be 1.2 mm, 1.6 mm, 2 mm, 2.4 mm, 2.8 mm, 3.2 mm, 3.6 mm, 4 mm…10 mm, 10.4 mm, 10.8 mm, 11.2, 11.6 or 12 mm.

[0136] In the above scheme, the second direction y is the direction opposite to the two second walls 111. The size L of the battery cell 10 in the second direction y can also be regarded as the length size of the battery 100. The length of the battery cell 10 is related to the capacity of the battery cell 10, and the larger the capacity of the battery cell 10, the longer the battery cell 10 can be, so the length of the battery cell 10 affects the energy density and safety of the battery 100. When D / L>0.3, there is a problem that the exhaust gap D is too large, resulting in waste of internal space of the battery 100, affecting the energy density of the battery 100; when D / L is less than 0.03, there is a problem that the exhaust gap D is insufficient, and after the battery cell 10 is out of control, the high-temperature gas inside cannot be discharged in time, causing the shell 11 to rupture or even the battery 100 to explode. Therefore, in the present application, the battery cell 10 satisfies 0.03≤D / L≤0.3 (the unit of L is mm), so that the battery 100 has a higher energy density under the condition of higher safety.

[0137] According to some embodiments of the present application, 0.03≤D / L≤0.17 is satisfied.

[0138] In some embodiments, D / L can be any value between 0.03 and 0.17, such as 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16 or 0.17.

[0139] In the above scheme, the battery 100 satisfies 0.03≤D / L≤0.17, to further limit the ratio of the exhaust gap of each battery cell 10 and the length (the dimension L of the battery cell 10 in the second direction y) of the battery cell 10, to optimize the battery 100, so that the battery 100 has higher safety and has higher energy density.

[0140] According to some embodiments of the present application, 0.08≤D / L≤0.15 is satisfied.

[0141] In some embodiments, D / L can be any value in the range of 0.08-0.15, such as 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14 or 0.15.

[0142] In the above scheme, the battery 100 satisfies 0.08≤D / L≤0.15, to further limit the ratio of the exhaust gap of each battery cell 10 and the length of the battery cell 10, to balance the safety and energy density of the battery 100, and to make the battery 100 have higher energy density under the condition of ensuring the safety of the battery 100.

[0143] According to some embodiments of the present application, the battery 100 further comprises a box 30, the battery cell 10 is arranged in the box 30, the exhaust volume in the box 30 is V, and 0.1≤V / C≤1.4 is satisfied, the unit of V is mm 3 .

[0144] The exhaust volume V is the volume in the box 30 that can accommodate the volume discharged by a single battery cell 10. When a plurality of battery cells 10 are arranged in the box 30, the box 30 needs to have a corresponding exhaust volume V, for example, when the number of battery cells 10 is n, the total exhaust volume of the box 30 is nV. In some embodiments, the total exhaust volume in the box 30 can be the volume of the gap in the box 30. In some embodiments, the exhaust volume V can be obtained by subtracting the volume of each structure in the box 30 from the volume of the box 30 and dividing by the number of battery cells 10.

[0145] In some embodiments, V / C can be any value in the range of 0.1-1.4, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3 or 1.4. For example, in some embodiments, when the capacity C of the battery cell 10 is 100 Ah, the exhaust volume V can be 10 mm 3 , 20 mm 3 , 30 mm 3 , 40 mm 3 , 50 mm 3 , 60 mm3 70mm 3 80mm 3 90mm 3 100mm 3 110mm 3 120mm 3 130mm 3 or 140mm 3 .

[0146] In the above scheme, the battery 100 usually has a good sealing property to prevent water and dust. When the battery cell 10 is in thermal runaway, the box 30 needs to have enough space to accommodate high-temperature gas, i.e., the exhaust volume V (unit: mm 3 If the exhaust volume is too small, there is a risk of the box 30 being broken or the battery 100 exploding, but if the exhaust space is too large, it indicates that there is a problem of space waste in the box 30, which affects the energy density of the battery 100. When V / C>1.4, the exhaust volume V is too large, resulting in space waste in the box 30, which affects the energy density of the battery 100. When V / C<0.1, the exhaust volume V is insufficient to accommodate the gas discharged after the battery cell 10 is in thermal runaway, resulting in excessive internal pressure of the box 30, which causes the box 30 to be broken or exploded. Therefore, the battery 100 provided in the present application satisfies 0.1≤V / C≤1.4, so that the battery 100 has a higher energy density under the condition of higher safety.

[0147] According to some embodiments of the present application, 0.2≤V / C≤0.8 is satisfied.

[0148] In some embodiments, V / C can be any value between 0.2 and 0.8, such as 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8.

[0149] In the above scheme, the battery 100 satisfies 0.2≤V / C≤0.8, which further limits the ratio of the exhaust volume V and the capacity C of the battery cell 10 in the battery 100 to optimize the internal space of the battery 100, so that the battery 100 has higher safety and higher energy density.

[0150] According to some embodiments of the present application, 0.3≤V / C≤0.5 is satisfied.

[0151] In some embodiments, V / C can be any value between 0.3 and 0.5, such as 0.3, 0.35, 0.4, 0.45, or 0.5.

[0152] In the above scheme, the battery 100 satisfies 0.3≤V / C≤0.5, and the ratio of the exhaust volume V and the capacity C of the battery cell 10 in the battery 100 is further limited to balance the safety and the energy density of the battery 100, so that the battery 100 has a higher energy density under the condition of ensuring the safety of the battery 100.

[0153] According to some embodiments of the present application, the projection of the blocking piece 20 on the first wall 110 completely covers the pressure relief mechanism 12.

[0154] The "projection of the blocking piece 20 on the first wall 110" can refer to the projection of the blocking piece 20 on the first wall 110 along the thickness direction of the first wall 110. The "covering the pressure relief mechanism 12" can refer to the area of the projection of the blocking piece 20 on the first wall 110 being greater than the area of the pressure relief mechanism 12, and the pressure relief mechanism 12 being located within the projection of the blocking piece 20; or can refer to the high-temperature and high-pressure gas discharged by the pressure relief mechanism 12 being completely blocked by the blocking piece 20.

[0155] In the above scheme, the blocking piece 20 is further limited, that is, the projection of the blocking piece 20 on the first wall 110 needs to completely cover the pressure relief mechanism 12, so as to ensure the accuracy of the D / C, D / X, D / H, D / L, and V / C limited ranges.

[0156] According to some embodiments of the present application, the blocking piece 20 has a first surface facing the first wall 110, and the area of the first surface is greater than the area of the first wall 110.

[0157] The first surface can be a surface of the blocking piece 20 parallel to the first wall 110, and the area of the first surface is greater than the area of the first wall 110. It can be understood that the projection of the blocking piece 20 on the plane perpendicular to the thickness direction of the first wall 110 completely covers the first wall 110, and can refer to the high-temperature and high-pressure gas discharged by the pressure relief mechanism 12 being completely blocked by the blocking piece 20.

[0158] In the above scheme, the blocking piece 20 is further limited, that is, the area of the first surface of the blocking piece 20 needs to be greater than the area of the first wall 110, so as to ensure the accuracy of the D / C, D / X, D / H, D / L, and V / C limited ranges.

[0159] According to some embodiments of the present application, the battery 100 further includes a box 30, the battery cell 10 is arranged in the box 30, and the blocking piece 20 is a wall of the box 30.

[0160] In some embodiments, as Figure 2 and Figure 4When the battery cell 10 is laid in the box 30, the "wall of the box 30" can be the side wall 33 of the box 30; in other embodiments, when the battery cell 10 is erected in the box 30, the "wall of the box 30" can be the top wall 31 of the box 30.

[0161] In the above scheme, it is defined that the blocking member 20 is the wall of the box 30, i.e. there is no other component between the pressure relief mechanism 12 and the wall of the box 30 that can block the flow of high-temperature and high-pressure gas, i.e. the high-temperature and high-pressure gas discharged by the battery cell 10 is first blocked by the wall of the box 30.

[0162] It should be noted that, in Figure 2 , two battery cells 10 are exemplarily arranged in the box 30, so as to show the battery cell 10, the corresponding blocking member 20 and the corresponding exhaust gap D. In the embodiments of the present application, the arrangement position of one battery cell 10 relative to another battery cell 10 is not limited.

[0163] According to some embodiments of the present application, the battery 100 further comprises a box 30, and the battery cell 10 and the blocking member 20 are arranged in the box 30.

[0164] The "blocking member 20 is arranged in the box 30" can mean that the blocking member 20 is not the wall of the box 30, but can be other component arranged in the box 30 relative to the pressure relief mechanism 12.

[0165] In the above scheme, it is defined that the blocking member 20 is not the wall of the box 30, i.e. there is other component between the pressure relief mechanism 12 and the wall of the box 30 that can block the flow of high-temperature gas, i.e. the high-temperature gas discharged by the battery cell 10 is first blocked by the blocking member 20 between the wall of the box 30 and the pressure relief mechanism 12.

[0166] According to other embodiments of the present application, as Figure 7 , Figure 7 is a schematic view of the battery 100 in some embodiments of the present application. The blocking member 20 is a thermal management component 40, and the thermal management component 40 is used to contain a medium to adjust the temperature of the battery cell 10.

[0167] In Figure 7 , the thermal management component 40 can be located between the side wall 33 of the box 30 and the first wall 110 of the battery cell 10.

[0168] In other embodiments, as Figure 2 , the thermal management component 40 can be arranged at the position of the second wall 111 of the battery cell 10.

[0169] The thermal management component 40 is used to contain a medium to regulate the temperature of the battery cell 10, so that the battery 100 is in a suitable temperature range, ensuring higher safety. The medium here can be a fluid (liquid) or gas, and the temperature regulation refers to heating or cooling the plurality of battery cells 10, and the fluid can be referred to as a heat exchange medium. Alternatively, the fluid can be circulated to achieve better temperature regulation. Alternatively, the fluid can be water, a mixture of water and glycol, or air, etc. For example, in the case of cooling or cooling the battery cell 10, the thermal management component 40 is used to contain a cooling fluid to lower the temperature of the plurality of battery cells 10, at this time, the thermal management component 40 can also be referred to as a cooling component, a cooling system or a cooling plate, etc., and the fluid contained therein can also be referred to as a cooling medium or a cooling fluid, and more specifically, it can be referred to as a cooling liquid or a cooling gas. When the fluid contained in the thermal management component 40 is cooling water, the thermal management component 40 can also be referred to as a water cooling plate, which contacts the layer of battery cells 10 and can be used to lower the temperature of the battery cells 10 to prevent thermal runaway of the battery cells 10. The thermal management component 40 can also be used to heat the battery cells 10 by a fluid with a higher temperature than the battery cells 10, which is not limited in the embodiments of the present application.

[0170] In the above scheme, it is limited that the blocking member 20 is the thermal management component 40, that is, there is no other component between the pressure relief mechanism 12 and the thermal management component 40 that can block the flow of high-temperature gas, that is, the high-temperature gas discharged by the battery cell 10 is first blocked by the thermal management component 40.

[0171] According to some embodiments of the present application, the blocking member 20 is a structural beam.

[0172] In some embodiments, the structural beam can be a component arranged in the box 30 to improve the structural strength of the box 30 to strengthen the protection of the battery cell 10. In other embodiments, the structural beam can also be a component arranged in the box 30 to limit the battery cell 10 to fasten the battery cell 10 in the box 30.

[0173] In the above scheme, the structural beam is a structure arranged in the box 30, which can have the effect of improving the structural strength of the box 30 or fastening the battery cell 10. In this scheme, the blocking member 20 is a structural beam, that is, there is no other component between the pressure relief mechanism 12 and the structural beam that can block the flow of high-temperature gas, that is, the high-temperature gas discharged by the battery cell 10 is first blocked by the structural beam.

[0174] According to some embodiments of the present application, the present application also provides a power utilization device comprising the battery 100 of any one of the first aspect, which is used to provide electric energy.

[0175] According to some embodiments of the present application, please refer to Figures 2-6The application also provides a battery 100, which comprises a box 30, the battery 100 and a blocking piece 20.

[0176] The box 30 comprises a top wall 31, a bottom wall 32 and a side wall 33, the top wall 31 and the bottom wall 32 are oppositely arranged along a third direction z, the side wall 33 is arranged around the bottom wall 32, and the side wall 33 is connected to the top wall 31 and the bottom wall 32.

[0177] The battery monomer 10 comprises an outer shell 11 and a pressure relief mechanism 12. The outer shell 11 comprises a first wall 110, a second wall 111, two third walls 112 and two fourth walls 113, the first wall 110 and the second wall 111 are oppositely arranged along a first direction x, the two third walls 112 are oppositely arranged along a second direction y, and the two fourth walls 113 are oppositely arranged along a third direction z, the first direction x, the second direction y and the third direction z are perpendicular to each other, the area of the first wall 110, the area of the second wall 111 and the area of the third wall 112 are all smaller than the area of the fourth wall 113. The surface where the fourth wall 113 is located is the large surface of the battery monomer 10. The pressure relief mechanism 12 is arranged on the first wall 110 of the outer shell 11.

[0178] The battery monomer 10 is laid in the box 30, the side wall 33 of the box 30 close to the first wall 110 of the battery monomer 10 is the blocking piece 20, and the exhaust gap is formed between the blocking piece 20 and the first wall 110, wherein the size of the exhaust gap is D (unit: mm), the capacity of the battery monomer 10 is C (unit: Ah), and the battery 100 provided in the embodiment can meet 0.01≤D / C≤0.14; preferably, 0.02≤D / C≤0.08; more preferably, 0.03≤D / C≤0.05.

[0179] In the embodiment, the size of the battery monomer 10 in the third direction z is X, that is, the thickness size of the battery monomer 10 is X (unit: mm), which can meet 0.1≤D / X≤1, preferably, 0.1≤D / X≤0.5; more preferably, 0.25≤D / X≤0.45.

[0180] In the embodiment, the size of the battery monomer 10 in the first direction x is H, that is, the height size of the battery monomer 10 is H (unit: mm), which can meet 0.05≤D / H≤0.5; preferably, 0.05≤D / H≤0.25; more preferably, 0.13≤D / H≤0.23.

[0181] In the embodiment, the size of the battery monomer 10 in the second direction y is L, that is, the height size of the battery monomer 10 is L (unit: mm), which can meet 0.03≤D / L≤0.3; preferably, 0.03≤D / L≤0.17; more preferably, 0.08≤D / L≤0.15.

[0182] In this embodiment, the exhaust volume V (unit: mm3) corresponding to each battery cell 10 in the box 30 can accommodate one battery cell 10, and can satisfy 0.1≤V / C≤1.4; preferably, 0.2≤V / C≤0.8; more preferably, 0.3≤V / C≤0.5. 3 In this embodiment, the exhaust volume V (unit: mm3) corresponding to each battery cell 10 in the box 30 can accommodate one battery cell 10, and can satisfy 0.1≤V / C≤1.4; preferably, 0.2≤V / C≤0.8; more preferably, 0.3≤V / C≤0.5.

[0183] The preferred embodiments of the present application have been described above, but the present application is not limited to the above embodiments. Various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A battery, characterized by, The battery comprises: a battery cell comprising a shell and a pressure relief mechanism, the pressure relief mechanism being arranged on a first wall of the shell, the capacity of the battery cell being C, the unit of C being Ah; a barrier, the barrier being a structural beam, the barrier being arranged opposite to the first wall along the thickness direction of the first wall, the projection of the barrier on the first wall covering at least a part of the pressure relief mechanism, an exhaust gap being formed between the barrier and the first wall; A box in which the battery cell is disposed, an exhaust volume in the box being V, satisfying 0.1≤V / C≤1.4, V being in units of mm 3 ; wherein the size of the exhaust gap is D, satisfying 0.01≤D / C≤0.14, the unit of D being mm; the exhaust gap D is related to the energy density of the battery, the size of the battery cell in a first direction is H, satisfying 0.05≤D / H≤0.5, the unit of H being mm, the size of the battery cell in a second direction is L, satisfying 0.03≤D / L≤0.3, the unit of L being mm, the size of the battery cell in a third direction is X, satisfying 0.1≤D / X≤1, the unit of X being mm, the first direction, the second direction and the third direction being perpendicular to each other.

2. The battery according to claim 1, wherein 0.02≤D / C≤0.08 is satisfied.

3. The battery according to claim 2, wherein 0.03≤D / C≤0.05 is satisfied.

4. The battery according to any one of claims 1-3, wherein the shell further comprises a second wall, two third walls and two fourth walls, the first wall and the second wall being arranged opposite to each other along a first direction, the two third walls being arranged opposite to each other along a second direction, the two fourth walls being arranged opposite to each other along a third direction, the first direction, the second direction and the third direction being perpendicular to each other, the area of the first wall, the area of the second wall and the area of the third wall being all smaller than the area of the fourth wall.

5. The battery according to claim 4, wherein the battery further comprises a box, the battery cell being arranged in the box, the box comprising a top wall, a bottom wall and a side wall, the top wall and the bottom wall being arranged opposite to each other along the third direction, the side wall being arranged around the bottom wall, the side wall connecting the top wall and the bottom wall.

6. The battery according to claim 1, wherein 0.1≤D / X≤0.5 is satisfied.

7. The battery according to claim 6, wherein 0.25≤D / X≤0.45 is satisfied.

8. The battery according to claim 1, wherein 0.05≤D / H≤0.25 is satisfied.

9. The battery according to claim 8, wherein 0.13≤D / H≤0.23 is satisfied.

10. The battery according to claim 1, wherein 0.03≤D / L≤0.17 is satisfied.

11. The battery according to claim 10, wherein 0.08≤D / L≤0.15 is satisfied.

12. The battery according to claim 1, wherein 0.2≤V / C≤0.8 is satisfied.

13. The battery according to claim 12, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ satisfying 0.3 ≤ V / C ≤ 0.

5.

14. The battery of claim 1, wherein, a projection of the barrier on the first wall completely covers the pressure relief mechanism.

15. The battery of claim 1, wherein, the barrier has a first surface facing the first wall, an area of the first surface being greater than an area of the first wall.

16. The battery of claim 1, wherein, the battery further comprises a case, the battery cell is disposed within the case, and the barrier is a wall of the case.

17. The battery of claim 1, wherein, the battery further comprises a case, the battery cell and the barrier are disposed within the case.

18. An electrical device, comprising: A battery comprising any one of claims 1-17, the battery being used to provide electrical energy.

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