Battery and power consumption device

Abstract

Embodiments of the present application provide a battery and a power consumption device that can ensure the safety performance of the battery. The battery (10) includes at least one battery cell (20) having a first pressure relief mechanism (213) and a housing (110) having a second pressure relief mechanism (113). An exhaust passage is formed between the first pressure relief mechanism (213) of the at least one battery cell (20) and the second pressure relief mechanism (113) of the housing (110). When the first pressure relief mechanism (213) operates, the exhaust passage is used to discharge the exhaust of the at least one battery cell (20) to the second pressure relief mechanism (113) through the first pressure relief mechanism (213), and the minimum length of the exhaust path of the exhaust in the exhaust passage is 0.1 m to 10 m. By providing the exhaust passage inside the housing, the shortest exhaust path of the exhaust of the battery cell inside the housing can be controlled, thereby controlling the temperature when the exhaust is discharged from the housing and ensuring the safety performance of the battery.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of batteries, and more specifically, to batteries and power consumption devices.

Background Art

[0002] With the development of the times, electric vehicles are predicted to have a very large market due to advantages such as high environmental friendliness, low noise, and low cost, and can effectively promote energy conservation and emission reduction, which is beneficial to the development and progress of society. For electric vehicles, battery technology is one of the factors related to their development.

[0003] In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. If the safety of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to ensure the safety of the battery is an urgent problem to be solved in battery technology.

Summary of the Invention

[0004] The present application provides a battery and a power consumption device capable of ensuring the safety performance of the battery.

[0005] According to a first aspect, a battery is provided. The battery includes at least one battery cell having a first pressure relief mechanism, and a housing used to accommodate at least one battery cell and having a second pressure relief mechanism. An exhaust passage is formed between the first pressure relief mechanism of at least one battery cell and the second pressure relief mechanism of the housing. When the first pressure relief mechanism operates, the exhaust passage is used to discharge the exhaust of at least one battery cell to the second pressure relief mechanism through the first pressure relief mechanism, and the minimum length of the exhaust path of the exhaust in the exhaust passage is 0.1 m to 10 m.

[0006] According to the technical solution of the embodiment of the present application, an exhaust passage is formed between the first pressure relief mechanism of at least one battery cell and the second pressure relief mechanism of the housing. By designing the exhaust passage inside the housing, the minimum length of the exhaust path of the exhaust from at least one battery cell in the exhaust passage is set to 0.1 m to 10 m, so as to prevent the temperature of the exhaust when being discharged from the housing from being relatively high due to the too short exhaust path, and also prevent the exhaust from being collected inside the housing to generate a relatively large pressure and greatly damage the sealing performance of the housing due to the too long exhaust path. Therefore, according to this technical solution, it is possible to balance controlling the temperature of the exhaust when it is discharged from the housing and controlling the pressure generated inside the housing, and comprehensively ensure the safety performance and sealing performance of the battery.

[0007] In some possible embodiments, the minimum length of the exhaust path is 0.3 m to 5 m.

[0008] According to the technical solution of this embodiment, when the minimum length of the exhaust path is 0.3 m to 5 m, the influence of the exhaust on the battery housing is relatively small, the battery housing is in a normal state, no abnormal phenomenon occurs, and the safety performance of the entire battery can be ensured relatively reliably.

[0009] In some possible embodiments, the minimum length of the exhaust path is greater than the shortest distance between the first pressure relief mechanism and the second pressure relief mechanism.

[0010] According to the technical solution of this embodiment, the exhaust is not discharged to the outside of the housing through the shortest distance between the first pressure relief mechanism and the second pressure relief mechanism, and the exhaust path inside the housing is relatively long. This technical solution is advantageous for reducing the temperature of the exhaust inside the housing, thereby further improving the safety performance of the battery.

[0011] In some possible embodiments, the minimum length B of the exhaust path and the volume energy density E of the battery cell satisfy the relationship of 0.0001 m / (Wh / L) ≤ B / E ≤ 0.01 m / (Wh / L), the unit of B is m, and the unit of E is Wh / L.

[0012] According to the technical solution of this embodiment, the volume energy density of the battery cell and the minimum length of the discharge path need to satisfy a certain proportional relationship. Specifically, when the volume energy density of the battery cell is constant, the ratio of the minimum length of the discharge path to the volume energy density of the battery cell is 0.0001 m / (Wh / L) or more, thereby ensuring that the discharge path has a sufficient length and further sufficiently cooling the discharge of the battery cell inside the housing. Further, when the volume energy density of the battery cell is constant, the ratio of the length of the exhaust passage to the volume energy density of the battery cell is 0.01 m / (Wh / L) or less. According to this solution, it is possible to prevent too much discharge from accumulating inside the housing due to the exhaust passage inside the housing being too long and the pressure inside the housing being too high. Therefore, according to this solution, it is possible to achieve both ensuring the safety performance of the battery and ensuring the comprehensive performance such as the sealing performance of the battery.

[0013] In some possible embodiments, the minimum length B of the discharge path and the volume energy density E of the battery cell satisfy the relationship of 0.0002 m / (Wh / L) ≤ B / E ≤ 0.005 m / (Wh / L).

[0014] According to the technical solution of this embodiment, the housing of the battery can be in a relatively reliable normal state. In this case, the comprehensive performance of the battery is relatively excellent, and both its safety performance and sealing performance can be ensured to be relatively good.

[0015] In some possible embodiments, the minimum length B of the discharge path, the shortest distance A between the first pressure relief mechanism and the second pressure relief mechanism, and the volume energy density E of the battery cell satisfy the relationship of 0.0015 L / Wh ≤ (B / A) / E ≤ 0.08 L / Wh, where the unit of A and B is m and the unit of E is Wh / L.

[0016] According to the technical solution of this embodiment, when designing the minimum length of the discharge path, considering the volume energy density of the battery cell, and further considering the shortest distance between the first pressure relief mechanism and the second pressure relief mechanism, comprehensively ensure the compatibility of the designed minimum length of the discharge path with the battery, thereby improving the performance such as the safety performance and sealing performance of the battery relatively well.

[0017] In some possible embodiments, the minimum length B of the discharge path, the shortest distance A between the first pressure relief mechanism and the second pressure relief mechanism, and the volume energy density E of the battery cell satisfy the relationship of 0.003 L / Wh ≤ (B / A) / E ≤ 0.04 L / Wh.

[0018] According to the technical solution of this embodiment, the housing of the battery can be relatively surely in a normal state. In this case, the overall performance of the battery is excellent, and both its safety performance and sealing performance can be relatively well ensured.

[0019] In some possible embodiments, the battery further includes an enclosure mechanism for surrounding and forming a first exhaust space corresponding to the first pressure relief mechanism of at least one battery cell, and an opening communicating with the first exhaust space is provided in the enclosure mechanism, and the first exhaust space is used to form at least part of the exhaust passage.

[0020] According to the technical solution of this embodiment, since the enclosure mechanism is provided inside the housing of the battery, the enclosure mechanism can form an effective exhaust passage inside the housing. By performing related design on the enclosure mechanism, it is possible to effectively control the length of the exhaust passage and the minimum length of the exhaust path, so as to meet the safety requirements and performance requirements of the battery.

[0021] In some possible embodiments, the opening is located at a position away from the second pressure relief mechanism in the enclosure mechanism.

[0022] According to the technical solution of this embodiment, by providing it at a position surrounding the opening and away from the second pressure relief mechanism in the surrounding mechanism, the distance between the opening and the second pressure relief mechanism can be increased, thereby further extending the discharge path of the battery cell discharge inside the battery housing, further reducing the temperature when the discharge reaches the second pressure relief mechanism, and improving the safety performance of the battery.

[0023] In some possible embodiments, the opening faces another housing wall other than the housing wall where the second pressure relief mechanism in the housing is located.

[0024] According to the technical solution of this embodiment, the opening of the surrounding mechanism can be designed according to the installation of the second pressure relief mechanism of the housing, thereby ensuring that the opening does not face the housing wall where the second pressure relief mechanism is located, increasing the distance between the opening and the second pressure relief mechanism, thereby further extending the discharge path of the battery cell discharge inside the battery housing, further reducing the temperature when the discharge reaches the second pressure relief mechanism, and improving the safety performance of the battery.

[0025] In some possible embodiments, the opening is located in the central region of the housing.

[0026] According to the technical solution of this embodiment, by positioning the opening of the surrounding mechanism in the central region of the housing, the distance between the opening and the second pressure relief mechanism located on the housing wall of the housing can also be increased, thereby extending the discharge path of the battery cell discharge inside the battery housing, further reducing the temperature when the discharge reaches the second pressure relief mechanism, and improving the safety performance of the battery.

[0027] In some possible embodiments, the number of surrounding mechanisms is plural, and the plural surrounding mechanisms are provided at intervals.

[0028] According to the technical solution of this embodiment, a plurality of enclosing mechanisms are provided inside the housing of the battery. The plurality of enclosing mechanisms can be flexibly installed and adjusted according to actual needs, thereby facilitating better guiding of the emissions of battery cells at different positions of the housing and further improving the safety performance of the entire battery.

[0029] In some possible embodiments, the openings of two adjacent enclosing mechanisms among the plurality of enclosing mechanisms are provided on two adjacent walls of the two adjacent enclosing mechanisms, and the openings of the two adjacent enclosing mechanisms are provided offset from each other.

[0030] According to the technical solution of this embodiment, by providing the openings of adjacent enclosing mechanisms among the plurality of enclosing mechanisms offset from each other, it is possible to prevent the high-temperature emissions of battery cells received by the first exhaust space formed by one enclosing mechanism from having a greater range of influence and damage on the battery cells corresponding to other adjacent enclosing mechanisms, and also prevent the pressure in the first exhaust space from being too high, thus ensuring the safety performance of the battery.

[0031] In some possible embodiments, a first pressure relief mechanism is provided on the first wall of at least one battery cell. The first wall of at least one battery cell is provided opposite to the first housing wall of the housing, and the enclosing mechanism is provided between the first housing wall and the first wall of at least one battery cell.

[0032] According to the technical solution of this embodiment, an enclosing mechanism can be easily provided and attached between the first housing wall and the first wall of at least one battery cell, and the enclosing mechanism can also easily form a first exhaust space by surrounding the space corresponding to the first pressure relief mechanism of at least one battery cell.

[0033] In some possible embodiments, the enclosing mechanism is attached to the first housing wall and the first wall of at least one battery cell, and the second pressure relief mechanism is provided on other housing walls other than the first housing wall of the housing.

[0034] According to the technical solution of this embodiment, the surrounding mechanism can be stably attached to the housing, and the surrounding mechanism can also easily guide the direction of the exhaust of the at least one battery cell, extend the exhaust path inside the housing of the exhaust, and improve the safety performance of the battery.

[0035] In some possible embodiments, the second housing wall of the housing intersects the first housing wall of the housing, the second pressure relief mechanism is provided on the second housing wall, a second exhaust space is formed between the surrounding mechanism and the second housing wall, the second exhaust space communicates with the first exhaust space through an opening, the exhaust enters the second exhaust space through the opening, and is discharged to the second pressure relief mechanism.

[0036] According to the technical solution of this embodiment, the surrounding mechanism partitions the first exhaust space and the second exhaust space inside the housing, and the second exhaust space communicates with the second housing wall of the housing. Therefore, the position design of the second pressure relief mechanism on the second housing wall of the housing can be facilitated, which is beneficial to further extending the exhaust path inside the housing of the exhaust, and ensuring the safety performance of the battery.

[0037] In some possible embodiments, at least one battery cell is arranged to form a battery cell assembly, and two electrode terminals are provided on the first wall of each battery cell in the battery cell assembly. The first pressure relief mechanism is provided between the two electrode terminals, and the surrounding mechanism is provided between the two electrode terminals of each battery cell in the battery cell assembly.

[0038] According to the technical solution of this embodiment, since the distance from the surrounding mechanism to the first pressure relief mechanism is relatively close, the surrounding mechanism can play a role in well blocking and guiding the exhaust discharged from the first pressure relief mechanism. At the same time, the surrounding mechanism can prevent the exhaust discharged from the first pressure relief mechanism from affecting the electrode terminals or other components of the battery cell, and can further guarantee the safety performance of the battery.

[0039] In some possible embodiments, an isolation member is provided between the first housing wall and the first wall of at least one battery cell. The isolation member is used to form an electrical chamber and an exhaust chamber that are mutually isolated inside the housing. The electrical chamber is used to accommodate at least one battery cell. The exhaust of at least one battery cell is discharged into the exhaust chamber through the isolation member. The surrounding mechanism is provided in the exhaust chamber and is attached to the isolation member and the first housing wall. The surrounding mechanism is used to surround and form a first exhaust space corresponding to the first pressure relief mechanism of at least one battery cell in the exhaust chamber.

[0040] According to the technical solution of the embodiment of the present application, since the housing is partitioned into an electrical chamber and an exhaust chamber that are mutually isolated by the isolation member, the exhaust of the battery cell in the electrical chamber is first discharged into the exhaust chamber through the isolation member, without directly affecting the electrical configuration of the battery cell in the electrical chamber, thereby further improving the safety performance of the battery. Furthermore, the surrounding mechanism is provided in the exhaust chamber and is used to guide the exhaust, so that the exhaust can be discharged only from the opening in the surrounding mechanism, extending the exhaust path of the exhaust inside the housing and further improving the safety performance of the battery.

[0041] In some possible embodiments, the second pressure relief mechanism is provided on the housing wall corresponding to the exhaust chamber of the housing.

[0042] According to the technical solution of the embodiment of the present application, the exhaust can be easily discharged from the exhaust chamber, and the exhaust does not affect the electrical configuration in the electrical chamber.

[0043] In some possible embodiments, the second pressure relief mechanism is provided on other housing walls of the housing except for the first housing wall.

[0044] According to the technical solution of the embodiment of the present application, by providing the second pressure relief mechanism on other housing walls instead of the first housing wall, the exhaust path of the exhaust inside the housing can be extended, and the safety of the battery can be improved.

[0045] In some possible embodiments, a pressure relief region corresponding to a first pressure relief mechanism of at least one battery cell is formed in the isolation member, and the emissions of at least one battery cell are discharged into the exhaust chamber through the pressure relief region. The surrounding mechanism is used to surround and form a first exhaust space corresponding to the pressure relief region in the exhaust chamber.

[0046] According to the technical solution of this embodiment, by providing a pressure relief region in the isolation member, the emissions discharged from the first pressure relief mechanism can be effectively passed through, preventing the emissions from affecting the electrical components in the electrical chamber. The surrounding mechanism can surround the space corresponding to the pressure relief region, indirectly surrounding the space corresponding to the first pressure relief mechanism of the battery cell, thereby effectively guiding the emissions and comprehensively ensuring the safety performance of the battery.

[0047] In some possible embodiments, the isolation member is a thermal management member for regulating the temperature of the battery cell.

[0048] According to the technical solution of this embodiment, by using the thermal management member as the isolation member at the same time, the electrical chamber and the exhaust chamber that are mutually isolated in the housing can be partitioned to ensure the safety of the battery. Moreover, due to the presence of the thermal management member, it can further play a role in thermal management of the battery cell, thereby further improving the safety performance of the battery.

[0049] In some possible embodiments, a first filtration hole for filtering solid particles in the emissions is formed in the surrounding mechanism.

[0050] According to the technical solution of this embodiment, the first filtration holes provided in the surrounding mechanism are mainly used to allow the gas in the exhaust to pass through. Solid particles with relatively large particle sizes in the exhaust are filtered by the first filtration holes, and since the solid particles cannot be discharged outside the first exhaust space through the first filtration holes, according to this technical solution, the high-temperature solid particles discharged to the second pressure relief mechanism can be reduced, and the safety of the battery can be further improved. Also, by providing the first filtration holes in the surrounding mechanism, the exhaust speed and pressure relief speed of the first exhaust space can be accelerated, and it can be prevented that the pressure in the first exhaust space is too high. At the same time, when the number of the first filtration holes is plural, the airflows discharged from the plural first filtration holes collide with each other, thereby generating a certain degree of spoiler effect, and thereby, the harm caused by the direct impact of the gas can be reduced.

[0051] In some possible embodiments, the surrounding mechanism has an intermittent configuration, the surrounding mechanism is formed by a plurality of surrounding parts, and the gap between two adjacent surrounding parts among the plurality of surrounding parts forms the first filtration holes.

[0052] According to the technical solution of this embodiment, after forming the first filtration holes, the intermittent design of the surrounding mechanism improves the convenience of processing, there is no need to integrally form the surrounding mechanism, and the surrounding mechanism can be formed by manufacturing the sub-configurations of the plurality of surrounding mechanisms respectively.

[0053] In some possible embodiments, the diameter D of the first filtration holes and the volume energy density E of the battery cell satisfy the relationship of 0.0001 mm / (Wh / L) ≤ D / E ≤ 0.006 mm / (Wh / L), the unit of D is mm, and the unit of E is Wh / L.

[0054] According to the technical solution of this embodiment, the size of the first filtration holes can be designed according to the volume energy density of the battery cell, and the first filtration holes are adapted to the situation where thermal runaway occurs in the battery cell, play a role in filtering solid particles well in the surrounding mechanism, and can comprehensively improve the safety performance of the battery.

[0055] In some possible embodiments, the melting point of the material of the surrounding mechanism is 200 °C or higher.

[0056] According to the technical solution of this embodiment, the surrounding mechanism can withstand the impact of the high-temperature exhaust discharged from the battery cell, prevent the high-temperature exhaust from affecting the reliability in the use of the surrounding mechanism, and comprehensively ensure the safety performance of the battery.

[0057] In some possible embodiments, at least one housing wall of the housing is a hollow housing wall, a second pressure relief mechanism is provided on the outer surface of the hollow housing wall, an exhaust port is provided on the inner surface of the hollow housing wall, and at least a part of the exhaust passage is formed in the internal space between the inner surface and the outer surface of the hollow housing wall.

[0058] According to the technical solution of this embodiment, the hollow housing wall of the housing can be used to form an exhaust passage for the exhaust, thereby saving the internal space of the housing and improving the energy density of the battery.

[0059] In some possible embodiments, at least two housing walls of the housing are hollow housing walls, the exhaust port and the second pressure relief mechanism are provided on different hollow housing walls, or the exhaust port and the second pressure relief mechanism are provided on the same hollow housing wall, and the exhaust port and the second pressure relief mechanism are provided offset from each other.

[0060] According to the technical solution of this embodiment, it is advantageous to extend the exhaust path of the exhaust of the battery cell inside the housing wall of the housing by providing the exhaust port and the second pressure relief mechanism on different hollow housing walls of the housing, or by providing the exhaust port and the second pressure relief mechanism provided on the same hollow housing wall offset from each other, reduce the temperature when the exhaust reaches the second pressure relief mechanism, and improve the safety performance of the battery.

[0061] In some possible embodiments, at least one housing wall of the housing is a hollow housing wall, a second pressure relief mechanism is provided on the outer surface of the hollow housing wall, the battery further includes a hollow cross member, an exhaust port is provided on the inner surface of the hollow cross member and / or the hollow housing wall, the internal space of the hollow cross member communicates with the internal space of the hollow housing wall, and at least a part of the exhaust passage is formed in the internal space of the hollow cross member and the internal space of the hollow housing wall.

[0062] In the technical solution of this embodiment, a part of the exhaust passage for the discharge can be formed by using the internal space of the hollow housing wall and / or the hollow cross member of the housing, saving the internal space of the housing, improving the energy density of the battery, further extending the discharge path of the discharge inside the housing, and improving the safety performance of the battery.

[0063] In some possible embodiments, when the number of at least one battery cell is plural, the plural battery cells include plural sets of battery cells, the hollow cross member is used to partition the internal space of the housing into plural sub-spaces, the plural sub-spaces are respectively used to accommodate plural sets of battery cells, exhaust ports are provided on the hollow cross member corresponding to each of the plural sub-spaces, and / or exhaust ports are provided on the inner surface of the hollow housing wall corresponding to each of the plural sub-spaces.

[0064] According to the technical solution of this embodiment, when the internal space of the housing is partitioned into plural sub-spaces by the hollow cross member, it is advantageous to reduce or prevent the battery cells accommodated in each sub-space from affecting the battery cells accommodated in other sub-spaces, and improve the safety performance of the battery. Further, in order to ensure that the discharges of the battery cells accommodated in each sub-space can be discharged smoothly, each sub-space is provided with an exhaust port on the inner surface of the hollow cross member and / or the hollow housing wall, thereby further improving the safety performance of the battery.

[0065] In some possible embodiments, the battery further includes a separation member, which is used to form an electrically isolated chamber and an exhaust chamber that are mutually isolated in the internal space of the housing. The electrically isolated chamber is used to accommodate at least one battery cell, and the exhaust chamber is used to receive the emissions from at least one battery cell and form at least a part of the exhaust passage. The hollow cross member is located in the electrically isolated chamber and connected to the separation member. An exhaust port is provided at the connection between the hollow cross member and the separation member, and the exhaust port is used to receive the emissions from the exhaust chamber.

[0066] According to the technical solution of this embodiment, since the housing is partitioned into an electrically isolated chamber and an exhaust chamber that are mutually isolated by the separation member, the emissions of the battery cells in the electrically isolated chamber are discharged into the exhaust chamber through the separation member, without affecting the electrical configuration of the battery cells in the electrically isolated chamber, and the safety performance of the battery can be improved. Furthermore, by further using the internal spaces of the hollow cross member and the hollow housing wall in the electrically isolated chamber as the exhaust passage for the emissions, the exhaust path of the emissions inside the housing can be further extended, and the safety performance of the battery can be improved.

[0067] In some possible embodiments, the battery further includes a surrounding mechanism provided in the exhaust chamber. A pressure relief region corresponding to the first pressure relief mechanism of at least one battery cell is formed in the separation member. The emissions of at least one battery cell are discharged into the exhaust chamber through the pressure relief region. The surrounding mechanism is used to surround and form a first exhaust space corresponding to the pressure relief region in the exhaust chamber, and an opening communicating with the first exhaust space is provided in the surrounding mechanism. The first exhaust space is used to form at least a part of the exhaust passage.

[0068] According to the technical solution of this embodiment, by providing the surrounding mechanism in the exhaust chamber, it can play a role in further guiding the path of the emissions discharged into the exhaust chamber, thereby further extending the exhaust path of the emissions inside the housing and improving the safety performance of the battery.

[0069] In some possible embodiments, the inner surface of the hollow housing wall and / or the hollow cross member are provided with second filtration holes for filtering solid particles in the exhaust.

[0070] According to the technical solution of this embodiment, by providing second filtration holes on the inner surface of the hollow housing wall and / or the hollow cross member to filter solid particles in the exhaust, the high-temperature solid particles discharged to the second pressure relief mechanism can be reduced, and the safety of the battery can be further improved.

[0071] In some possible embodiments, at least one of a filtration member, a gas absorption member, and a cooling member is provided in the exhaust passage.

[0072] According to the technical solution of this embodiment, by providing at least one of a filtration member, a gas absorption member, and a cooling member in the discharge path, the harm of the exhaust discharged to the outside of the housing can be further reduced, and the safety performance of the battery can be improved.

[0073] In some possible embodiments, the filtration member includes third filtration holes or a bent air flow path, and the third filtration holes or the bent air flow path are used for filtering solid particles in the exhaust.

[0074] According to the technical solution of this embodiment, the third filtration holes or the bent air flow path are easy to implement and can play a role in filtering solid particles well.

[0075] In some possible embodiments, the gas absorption member is formed of a gas absorption material for absorbing combustible gas in the exhaust.

[0076] According to the technical solution of this embodiment, the gas absorption member is easy to implement, can absorb combustible gas in the exhaust, and can prevent the safety risk of the battery caused by the combustible gas.

[0077] In some possible embodiments, the cooling member is formed of a heat-absorbing material for absorbing the heat quantity of the exhaust and cooling the exhaust.

[0078] According to the technical solution of this embodiment, the cooling member is easy to implement, absorbs and cools the exhaust, further reduces the temperature when the exhaust is discharged to the outside of the housing, thereby improving the safety performance of the battery.

[0079] In some possible embodiments, the maximum temperature T1 in the first pressure relief mechanism of the exhaust and the maximum temperature T2 in the second pressure relief mechanism of the exhaust satisfy the relationship of T1 - T2 ≥ 300 °C.

[0080] According to the technical solution of this embodiment, when the exhaust of the battery cell discharged through the first pressure relief mechanism reaches the second pressure relief mechanism after passing through a relatively long discharge path inside the housing, the temperature is significantly lower than the temperature in the first pressure relief mechanism, preventing the exhaust from causing safety risks when discharged to the outside of the battery.

[0081] In some possible embodiments, the maximum temperature T2 in the second pressure relief mechanism of the exhaust is T2 ≤ 300 °C.

[0082] According to the technical solution of this embodiment, when the exhaust of the battery cell discharged through the first pressure relief mechanism reaches the second pressure relief mechanism after passing through a relatively long discharge path inside the housing, the temperature is relatively low, thereby more reliably preventing the exhaust from causing safety risks when discharged to the outside of the battery and guaranteeing the safety performance of the battery.

[0083] According to a second aspect, a power consumption device is provided, the power consumption device includes the battery of the first aspect or any one of the possible embodiments in the first aspect, and the battery is used to provide power.

[0084] According to the technical solution of the embodiment of the present application, an exhaust passage is formed between the first pressure relief mechanism of at least one battery cell and the second pressure relief mechanism of the housing. By designing the exhaust passage inside the housing, the minimum length of the exhaust path of the exhaust gas of at least one battery cell in the exhaust passage is set to 0.1 m to 10 m, so as to prevent the temperature of the exhaust gas from being relatively high when the exhaust gas is discharged from the housing due to the too short exhaust path, and also prevent the exhaust gas from being collected inside the housing due to the too long exhaust path, resulting in a relatively large pressure and greatly damaging the sealing performance of the housing. Therefore, according to this technical solution, it is possible to achieve both controlling the temperature of the exhaust gas when it is discharged from the housing and controlling the pressure generated inside the housing, and comprehensively ensuring the safety performance and sealing performance of the battery.

Brief Description of the Drawings

[0085] To more clearly illustrate the technical solution of the embodiment of the present application, the drawings necessary for use in the embodiments of the present application are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

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[0087] In the drawings, the drawings are not drawn to actual scale.

Embodiments for Carrying Out the Invention

[0088] Hereinafter, embodiments of the present application will be described in more detail with reference to the drawings and examples. The following detailed description of the examples and the drawings are used to exemplarily explain the principles of the present application, but cannot be used to limit the scope of the present application. That is, the present application is not limited to the described examples.

[0089] In the description of the present application, unless otherwise specified, "a plurality" means two or more. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is merely for the convenience of description and simplification of the description of the present application, and does not indicate or imply that the indicated devices or elements must have a specific orientation, be configured and operated in a specific orientation, and thus cannot be understood as limiting the present application.

[0090] In the present application, the term "and / or" merely describes the relationship of the related objects, and represents that there can be three relationships. For example, A and / or B can represent three cases: the existence of A, the simultaneous existence of A and B, and the existence of B. Also, in the present application, the character " / " generally represents that the related objects before and after are in an "or" relationship.

[0091] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the art. The terms used in the specification of the present application are only for describing specific examples and are not intended to limit the present application. The terms "including", "having" and any variations thereof in the specification, claims and description of the above drawings of the present application are intended to cover non-exclusive "including". The terms such as "first", "second", "third", etc. in the specification, claims or drawings of the present application are for distinguishing different objects and are not for describing a specific order or a primary-secondary relationship.

[0092] In this application, when "embodiment" is mentioned, it means that specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. Each occurrence of this term at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. A person skilled in the art can clearly or implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0093] In the field of new energy, batteries, as the main power source for power-consuming devices such as electric vehicles, ships or aircraft, are of great importance. In this application, a battery refers to a single physical module including one or more battery cells so as to provide a higher voltage and capacity. Generally, the battery includes a housing for packaging one or more battery cells. The housing can prevent liquids or other foreign substances from affecting the charge and discharge of the battery cells. Optionally, the battery mentioned in this application may also be called a battery pack.

[0094] Optionally, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of this application are not limited thereto. The battery cells may be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc., and the embodiments of this application are not limited thereto. Generally, the battery cells are classified into three types, namely, cylindrical battery cells, rectangular battery cells and pouch battery cells, according to the packaging method, and the embodiments of this application are not limited thereto.

[0095] To develop battery technology, it is necessary to simultaneously consider various design factors, such as performance parameters like energy density, cycle life, discharge capacity, charge and discharge rate, etc., and also the safety of the battery needs to be considered.

[0096] In the case of a battery, the main safety risks are caused by the charging and discharging processes. To improve the safety performance of the battery, a pressure relief mechanism is generally provided in the battery cell. The pressure relief mechanism refers to an element or member that operates when the internal pressure or temperature of the battery cell reaches a predetermined threshold value to release the internal pressure or temperature. The predetermined threshold value can be adjusted according to the design requirements. The predetermined threshold value may be determined by one or more of the materials of the positive electrode tab, negative electrode tab, electrolyte, and separator in the battery cell. The pressure relief mechanism may employ, for example, a pressure-sensitive or temperature-sensitive element or member. That is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold value, the pressure relief mechanism operates to form a passage for releasing the internal pressure or temperature. After the pressure relief mechanism operates, the high-temperature and high-pressure substances inside the battery cell are discharged from the pressure relief mechanism to the outside as emissions. According to this form, the pressure of the battery cell can be relieved on the premise that the pressure or temperature can be controlled, thereby avoiding the occurrence of potential and more serious accidents. Here, the emissions of the battery cell include, but are not limited to, high-temperature and high-pressure gases due to reactions, electrolytes, dissolved or fragmented positive and negative electrode tabs, fragments of separators, flames, etc.

[0097] However, with the improvement of the energy density of the battery system, the temperature, speed, and proportion of solid particles of the emissions of the battery cell have all increased. If the discharge operation and path of the emissions are not specifically designed, the emissions will be discharged to the outside of the housing and are likely to catch fire when touching oxygen, causing serious safety risks.

[0098] In view of this, the present application provides a battery, which includes at least one battery cell having a first pressure relief mechanism and a housing for accommodating the at least one battery cell, and the housing has a second pressure relief mechanism. An exhaust passage is formed between the first pressure relief mechanism of the at least one battery cell and the second pressure relief mechanism of the housing. When the first pressure relief mechanism operates, the exhaust passage is used to discharge the exhaust of the at least one battery cell to the second pressure relief mechanism through the first pressure relief mechanism, and the minimum length of the exhaust path of the exhaust in the exhaust passage is 0.1 m to 10 m.

[0099] According to this technical solution, an exhaust passage is formed between the first pressure relief mechanism of the at least one battery cell and the second pressure relief mechanism of the housing. By designing the exhaust passage inside the housing, the minimum length of the exhaust path of the exhaust of the at least one battery cell in the exhaust passage is set to 0.1 m to 10 m, so as to prevent the temperature of the exhaust when it is discharged from the housing from being relatively high due to the exhaust path being too short, and it is also possible to prevent the exhaust from being collected inside the housing and generating a relatively large pressure, which greatly impairs the sealing performance of the housing due to the exhaust path being too long. Therefore, according to this technical solution, it is possible to achieve both controlling the temperature of the exhaust when it is discharged from the housing and controlling the pressure generated inside the housing, and comprehensively ensuring the safety performance and sealing performance of the battery.

[0100] The technical solutions described in the embodiments of the present application are all applicable to various devices using batteries, such as battery vehicles, power tools, electric vehicles, ships, and aerospace aircraft, etc. For example, aerospace aircraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0101] It should be understood that the technical solutions described in the embodiments of the present application are not limited to being applied to the devices described above, but can also be applied to all devices using batteries. However, for the convenience of description, in the following embodiments, electric vehicles are taken as examples for description.

[0102] For example, as shown in FIG. 1, FIG. 1 is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a gasoline vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range extended electric vehicle, or the like. A motor 11, a controller 12, and a battery 10 may be provided inside the vehicle 1, and the controller 12 is used to control the battery 10 to supply power to the motor 11. For example, the battery 10 may be provided at the bottom, head, or tail of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source of the vehicle 1 for the circuit system of the vehicle 1. For example, it is used to meet the demand for operating power consumption during starting, navigation, and driving of the vehicle 1. In another embodiment of the present application, the battery 10 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing gasoline or natural gas or a part of them to provide driving power for the vehicle 1.

[0103] To meet various power consumption demands, the battery may include a plurality of battery cells. The plurality of battery cells may be connected in series, in parallel, or in series-parallel connection. Series-parallel connection means a mixture of series connection and parallel connection. The battery may also be called a battery pack. Optionally, the plurality of battery cells are first connected in series, in parallel, or in series-parallel connection to form a battery module, and then the plurality of battery modules are connected in series, in parallel, or in series-parallel connection to form a battery. That is, the plurality of battery cells may directly form a battery, or may form a battery module first and then form a battery by the battery module.

[0104] For example, as shown in FIG. 2, FIG. 2 is a schematic structural diagram of a battery 10 according to an embodiment of the present application. The battery 10 may include a plurality of battery cells 20. The battery 10 may further include a housing 110 (which may also be referred to as a cover body). The interior of the housing 110 has a hollow structure, and the plurality of battery cells 20 are accommodated within the housing 110. As shown in FIG. 2, the housing 110 may include two parts, herein referred to as a first part 111 and a second part 112 respectively, and the first part 111 and the second part 112 are engaged. The shapes of the first part 111 and the second part 112 may be determined according to the shape formed by combining the plurality of battery cells 20. The first part 111 and the second part 112 may each have an opening. For example, the first part 111 and the second part 112 may both be hollow rectangular parallelepipeds and only one surface of each may be an opening surface. The opening of the first part 111 is provided opposite to the opening of the second part 112, and the first part 111 and the second part 112 are engaged with each other to form a housing 110 having a sealed chamber. After the plurality of battery cells 20 are connected in parallel, or in series, or in series-parallel combination, they are arranged within the housing 110 formed by the engagement of the first part 111 and the second part 112.

[0105] Optionally, the battery 10 may further include other structures, which will not be described further herein. For example, the battery 10 may further include a busbar member, and the busbar member is used to achieve electrical connection, such as parallel connection, or series connection, or series-parallel connection, between the plurality of battery cells 20. Specifically, the busbar member may achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar member may be fixed to the electrode terminals of the battery cells 20 by welding. The power of the plurality of battery cells 20 may further be led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may belong to the busbar member.

[0106] According to various power demands, the number of battery cells 20 may be set to any value. A plurality of battery cells 20 can be connected in series, parallel, or series-parallel connection to achieve a relatively large capacity or power. Since the number of battery cells 20 included in each battery 10 may be relatively large, for easy installation, the battery cells 20 may be provided in groups, and each group of battery cells 20 may constitute a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to the demand.

[0107] As shown in FIG. 3, FIG. 3 is a structural schematic diagram of a battery cell 20 according to an embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a case 211, and a cover 212. The wall of the case 211 and the cover 212 are both referred to as the wall of the battery cell 20. The case 211 is determined according to the shape in which one or more electrode assemblies 22 are combined. For example, the case 211 may be a hollow rectangular parallelepiped, cube, or cylinder, and has an opening on one surface of the case 211 so that one or more electrode assemblies 22 can be arranged inside the case 211. The cover 212 covers the opening and is connected to the case 211 to form a sealed chamber for arranging the electrode assembly 22. The case 211 is filled with an electrolyte, such as an electrolytic solution.

[0108] The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be provided on the cover 212. The cover 212 is generally in a flat plate shape, and the two electrode terminals 214 are fixed to the flat plate surface of the cover 212. The two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b respectively. One connection unit 23 (or may be called a current collecting unit 23) is correspondingly provided for each electrode terminal 214. The connection unit 23 is located between the cover 212 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0109] As shown in FIG. 3, each electrode assembly 22 has a first tab 221a and a second tab 222a with opposite polarities. For example, when the first tab 221a is the positive electrode tab, the second tab 222a is the negative electrode tab. The first tabs 221a of one or more electrode assemblies 22 are connected to one electrode terminal by one connection unit 23, and the second tabs 222a of one or more electrode assemblies 22 are connected to another electrode terminal by another connection unit 23.

[0110] As an example, a first pressure relief mechanism 213 may be provided on one wall of the battery cell 20. The first pressure relief mechanism 213 is used to operate and release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0111] Optionally, in one embodiment of the present application, the first pressure relief mechanism 213 and the electrode terminal 214 are provided on different walls of the battery cell 20. As an example, as shown in FIG. 3, the electrode terminal 214 of the battery cell 20 may be provided on the top wall of the battery cell 20, that is, the cover 212. The first pressure relief mechanism 213 is provided on another wall different from the top wall of the battery cell 20. For example, the first pressure relief mechanism 213 is provided on the bottom wall 215 opposite to the top wall.

[0112] Optionally, in another embodiment of the present application, the first pressure relief mechanism 213 and the electrode terminal 214 are provided on the same wall of the battery cell 20. As an example, both the electrode terminal 214 and the first pressure relief mechanism 213 may be provided on the top wall of the battery cell 20, that is, the cover 212.

[0113] The above-described first pressure relief mechanism 213 may be a part of the wall where it is located, or may have a structure separate from the wall where it is located. For example, it may be fixed to the wall where it is located by welding. For example, in the embodiment shown in FIG. 3, when the first pressure relief mechanism 213 is a part of the bottom wall 215, the first pressure relief mechanism 213 may be formed by providing a notch in the bottom wall 215, and the thickness of the bottom wall 215 corresponding to the notch is smaller than the thickness of other regions of the bottom wall 215 other than the notch of the first pressure relief mechanism 213. Further, the first pressure relief mechanism 213 may be various possible pressure relief mechanisms, and the embodiments of the present application do not limit this. For example, the first pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism, and the temperature-sensitive pressure relief mechanism is arranged to be able to melt when the temperature inside the battery cell 20 where the first pressure relief mechanism 213 is provided reaches a threshold value, and / or the first pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism, and the pressure-sensitive pressure relief mechanism is arranged to be able to rupture when the air pressure inside the battery cell 20 where the first pressure relief mechanism 213 is provided reaches a threshold value.

[0114] FIG. 4 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application. Optionally, FIG. 4 may be a top view, a bottom view, or a side view of the battery 10.

[0115] As shown in FIG. 4, the battery 10 includes at least one battery cell 20 and a housing 110. The at least one battery cell 20 has a first pressure relief mechanism 213, the housing 110 is used to accommodate the at least one battery cell 20, and has a second pressure relief mechanism 113. An exhaust passage is formed between the first pressure relief mechanism 213 of the at least one battery cell 20 and the second pressure relief mechanism 113 of the housing 110. The exhaust passage is used to discharge the exhaust of the at least one battery cell 20 to the second pressure relief mechanism 113 through the first pressure relief mechanism 213, and the minimum length of the exhaust path of the exhaust in the exhaust passage is 0.1 m to 10 m.

[0116] Specifically, in the battery 10 of the embodiment of the present application, the first pressure relief mechanism 213 of the battery cell 20 may be located on the same wall of the electrode terminal 214 of the battery cell 20 and the battery cell 20 as shown in FIG. 3. Alternatively, the first pressure relief mechanism 213 may be located on a wall different from the electrode terminal 214 and the battery cell 20. Specifically, for the related technical solutions of the battery cell 20 and the first pressure relief mechanism 213, reference may be made to the related description of the embodiment shown in FIG. 3 above, and no further explanation will be given here.

[0117] The housing 110 is used to accommodate at least one of the above-described battery cells 20, and the specific shape of the housing 110 may be adapted to the overall shape of at least one battery cell 20. Optionally, the housing 110 may be a rectangular parallelepiped housing including the first portion 111 and the second portion 112 in the embodiment shown in FIG. 2 above, and is used to accommodate at least one rectangular parallelepiped-shaped battery cell 20. For the related technical solutions of the housing 110, reference may be made to the related description of the embodiment shown in FIG. 2 above, and no further explanation will be given here.

[0118] A second pressure relief mechanism 113 may be provided on the housing wall of the housing 110, and the second pressure relief mechanism 113 may communicate with the internal space of the housing 110. Therefore, the second pressure relief mechanism can discharge the discharge of the battery cell 20 discharged into the internal space of the housing 110 to the outside of the housing 110 and can be used to ensure the safety performance of the battery 10.

[0119] Optionally, similar to the principle of pressure relief of the first pressure relief mechanism 213, the second pressure relief mechanism 113 may be a temperature-sensitive pressure relief mechanism or a pressure-sensitive pressure relief structure. When the internal temperature and / or pressure of the housing 110 is greater than a preset threshold, the second pressure relief mechanism 113 operates to discharge the gas inside the housing 110 to the outside of the housing 110 through the second pressure relief mechanism 113. The embodiment of the present application does not limit the specific implementation form of the second pressure relief mechanism 113.

[0120] Continuing to refer to FIG. 4, as shown in FIG. 4, in the battery 10, an exhaust passage may be formed between each battery cell 20 of the first pressure relief mechanism 213 of at least one battery cell 20 and the second pressure relief mechanism 113 of the housing. The exhaust passage serves to guide the exhaust of at least one battery cell 20 and is used to guide the exhaust from the first pressure relief mechanism 213 of at least one battery cell 20 to the second pressure relief mechanism 113. The exhaust forms an exhaust path by moving through the exhaust passage.

[0121] As a non-limiting example, inside the battery 10 shown in FIG. 4, a structural member for guiding the exhaust (as shown by the black structural material in the drawing) may be provided. The structural member may be provided according to the first pressure relief mechanism 213 of the battery cell 20, thereby forming an exhaust passage inside the housing 110 to guide the direction and path of the exhaust discharged from the first pressure relief mechanism 213.

[0122] Optionally, in the embodiments of the present application, the exhaust paths between the first pressure relief mechanism 213 and the second pressure relief mechanism 113 may be plural. The minimum length of the plural exhaust paths may be obtained by determining and calculating based on the dimensions of members such as related structural materials and the housing 110 inside the battery 10, and the relative positions of the first pressure relief mechanism 213 and the second pressure relief mechanism 113.

[0123] As an example, in FIG. 4, two exhaust paths for the exhaust of a certain battery cell 20 (the battery cell 20 shown by hatching in the drawing) among at least one battery cell 20 from the first pressure relief mechanism 213 to the second pressure relief mechanism 113 are shown by dashed arrows. Here, after the exhaust is discharged from the opening of the black structural material, the exhaust path that discharges downward is the first exhaust path, and the exhaust path that discharges upward is the second exhaust path. The length B' of the second exhaust path is greater than the length B of the first exhaust path. Optionally, the length B of the first exhaust path may be the minimum length B of the exhaust path between the first pressure relief mechanism 213 and the second pressure relief mechanism 113, and the minimum length B is 0.1 m to 10 m.

[0124] In an embodiment of the present application, when the battery 10 includes a plurality of battery cells 20 having a first pressure relief mechanism 213, the minimum length of the exhaust path between the first pressure relief mechanism 213 and the second pressure relief mechanism 113 for the exhaust of each battery cell 20 among the plurality of battery cells 20 is 0.1 m to 10 m.

[0125] It should be noted that the temperature of the exhaust of the battery cell 20 is relatively high when it is discharged from the first pressure relief mechanism 213, and the longer the length of the exhaust path of the exhaust inside the housing 110, the lower the temperature of the exhaust at the second pressure relief mechanism 113. However, the longer the length of the exhaust path of the exhaust inside the housing 110, the easier it is for a relatively large amount of exhaust to be collected inside the housing 110, the pressure inside the housing 110 becomes relatively large, swelling occurs, and even the sealing performance of the housing 110 is affected, and ultimately decomposition occurs.

[0126] Table 1 below shows the relevant experimental data of the minimum length B of the exhaust path, the maximum temperature at the second pressure relief mechanism 113 of the exhaust, and the state of the housing 110.

[0127]

Table 1

[0128] As can be seen from the above table, when the minimum length B of the exhaust path is less than 0.1 m, the temperature of the emissions discharged from the inside of the housing 110 is relatively high, which may cause a serious ignition hazard. When the minimum length B of the exhaust path is 0.1 m, only a few sparks are ejected from the housing 110, and the hazard is relatively small and controllable. When the minimum length B of the exhaust path is in the range of 0.3 m to 5 m, the housing 110 can be in a normal state. When the minimum length B of the exhaust path is greater than 5 m and less than or equal to 10 m, bulging occurs in the housing 110, which has a certain impact on the sealing performance of the housing 110, but the battery 10 can still be in a usable state. When the minimum length B of the exhaust path is greater than 10 m, the sealing performance of the housing 110 is greatly impaired, and in this case, there may be serious hazards such as explosion or ignition in the housing 110.

[0129] As described above, according to the technical solution of the embodiment of the present application, an exhaust passage is formed between the first pressure relief mechanism 213 of at least one battery cell 20 and the second pressure relief mechanism 113 of the housing 110. By designing the exhaust passage inside the housing 110, the minimum length of the exhaust path of the emissions of at least one battery cell 20 in the exhaust passage can be set to 0.1 to 10 m, so as to prevent the temperature of the emissions from being relatively high when they are discharged from the housing 110 due to the exhaust path being too short, and also prevent the emissions from being collected inside the housing 110 due to the exhaust path being too long, resulting in a relatively large pressure being generated and greatly impairing the sealing performance of the housing 110. Therefore, according to this technical solution, it is possible to achieve both controlling the temperature of the emissions when they are discharged from the housing 110 and controlling the pressure generated inside the housing 110, and comprehensively ensuring the safety performance and sealing performance of the battery.

[0130] In some possible embodiments, the minimum length of the exhaust path described above is 0.3 m to 5 m.

[0131] As can be seen from Table 1 described above, when the minimum length of the discharge path is 0.3 m to 5 m, the housing 110 can be in a normal state, no abnormal phenomenon occurs, and the safety performance of the entire battery 10 can be ensured relatively reliably.

[0132] In some possible embodiments, the minimum length of the discharge path is greater than the shortest distance between the first pressure relief mechanism 213 and the second pressure relief mechanism 113.

[0133] Optionally, as shown by the short dotted line segment in FIG. 4, the shortest distance A between the first pressure relief mechanism 213 and the second pressure relief mechanism 113 may be the length of the line connecting the center of the first pressure relief mechanism 213 and the center of the second pressure relief mechanism 113.

[0134] According to the technical solution of this embodiment, the discharge does not discharge to the outside of the housing 110 through the shortest distance between the first pressure relief mechanism 213 and the second pressure relief mechanism 113, and the discharge path inside the housing 110 is relatively long. This technical solution is advantageous for reducing the temperature of the discharge inside the housing 110, thereby further improving the safety performance of the battery 10.

[0135] In some possible embodiments, the minimum length B of the discharge path and the volume energy density E of the battery cell 20 satisfy the relationship of 0.0001 m / (Wh / L) ≤ B / E ≤ 0.01 m / (Wh / L), the unit of B is m, and the unit of E is Wh / L.

[0136] In this embodiment, the minimum length of the discharge path is associated with the volume energy density of the battery cell 20. Specifically, the greater the volume energy density of the battery cell 20, the longer the minimum length of the discharge path can be. The greater the volume energy density of the battery cell 20, the more likely it is that thermal runaway occurs in the battery cell 20, and the temperature of the discharge discharged through the first pressure relief mechanism 213 becomes higher. By extending the length of the exhaust passage inside the housing 110, the discharge having a relatively high temperature can be sufficiently cooled inside the housing 110.

[0137] In addition, in this embodiment, the volume energy density of the battery cell 20 and the minimum length of the discharge path need to satisfy a certain proportional relationship. Specifically, when the volume energy density of the battery cell 20 is constant, the ratio of the minimum length of the discharge path to the volume energy density of the battery cell 20 is 0.0001 m / (Wh / L) or more, thereby ensuring that the discharge path has a sufficient length and sufficiently cooling the discharge of the battery cell 20 inside the housing 110. Further, when the volume energy density of the battery cell 20 is constant, the ratio of the length of the exhaust passage to the volume energy density of the battery cell 20 is 0.01 m / (Wh / L) or less. According to this solution, it is possible to prevent too much discharge from accumulating inside the housing 110 due to the exhaust passage inside the housing 110 being too long and the pressure inside the housing 110 being too high.

[0138] As an example, Table 2 below shows the relevant experimental data of the ratio of the minimum length B of the discharge path to the volume energy density E of the battery cell 20, the maximum temperature in the second pressure relief mechanism 113 of the discharge, and the state of the housing 110.

[0139]

Table 2

[0140] As can be seen from Table 2 above, when the ratio of the minimum length B of the discharge path to the volume energy density E of the battery cell 20 is less than 0.0001 m / (Wh / L) or greater than 0.01 m / (Wh / L), phenomena such as direct fire or seal failure may occur in the housing 110, which may pose a relatively serious safety risk to the battery 10.

[0141] When the ratio of the minimum length B of the discharge path to the volume energy density E of the battery cell 20 is 0.0001 m / (Wh / L) or more and 0.01 m / (Wh / L) or less, the housing 110 is in a normal state, or only phenomena such as the ejection of a small amount of sparks or swelling appear, and the harm caused to the battery 10 by the small amount of sparks and swelling is relatively small, and the battery 10 can still be in a usable state.

[0142] In some embodiments, the minimum length B of the discharge path and the volumetric energy density E of the battery cell 20 can satisfy the relationship of 0.0002 m / (Wh / L) ≤ B / E ≤ 0.005 m / (Wh / L). Referring to the above table, in this embodiment, the housing 110 can be relatively surely in a normal state. In this case, the overall performance of the battery 10 is relatively excellent, and both its safety performance and sealing performance can be ensured to be relatively good.

[0143]

[0142] In some embodiments, the minimum length B of the discharge path, the shortest distance A between the first pressure relief mechanism 213 and the second pressure relief mechanism 113, and the volumetric energy density E of the battery cell 20 satisfy the relationship of 0.0015 L / Wh ≤ (B / A) / E ≤ 0.08 L / Wh, where the units of A and B are m, and the unit of E is Wh / L.

[0144] In this embodiment, the ratio of the minimum length of the discharge path to the shortest distance between the two pressure relief mechanisms (the first pressure relief mechanism 213 and the second pressure relief mechanism 113) and the volumetric energy density of the battery cell 20 are associated. Optionally, the larger the volumetric energy density of the battery cell 20, the larger the ratio of the minimum length of the discharge path to the shortest distance between the two pressure relief mechanisms. When the shortest distance between the two pressure relief mechanisms is constant, the minimum length of the discharge path can be increased by the relevant design inside the housing 110. Specifically, the larger the volumetric energy density of the battery cell 20, the higher the temperature of the discharged substances generated by thermal runaway in the battery cell 20 and discharged through the first pressure relief mechanism 213 may be. By extending the length of the discharge path inside the housing 110, the discharged substances with a relatively high temperature can be sufficiently cooled inside the housing 110.

[0145] In addition, in this embodiment, the ratio of the minimum length of the discharge path to the shortest distance between the two pressure relief mechanisms, and the volume energy density of the battery cell 20 need to satisfy a certain proportional relationship. Specifically, when the volume energy density of the battery cell 20 is constant, the ratio of the minimum length of the discharge path to the shortest distance between the two pressure relief mechanisms and the ratio of the volume energy density of the battery cell 20 are 0.0015 L / Wh or more, thereby ensuring that the discharge path has a sufficient length and sufficiently cooling the discharge of the battery cell 20 inside the housing 110. Further, when the volume energy density of the battery cell 20 is constant, the ratio of the minimum length of the discharge path to the shortest distance between the two pressure relief mechanisms and the ratio of the volume energy density of the battery cell 20 are 0.08 L / Wh or less. According to this solution, it is possible to prevent an excessive amount of discharged matter from accumulating inside the housing 110 and the pressure inside the housing 110 from being too high due to the exhaust passage inside the housing 110 being too long.

[0146] According to the technical solution of this embodiment, when designing the minimum length of the discharge path, considering the volume energy density of the battery cell 20, and further considering the shortest distance between the two pressure relief mechanisms (the first pressure relief mechanism 213 and the second pressure relief mechanism 113), the compatibility of the designed minimum length of the discharge path with respect to the battery 10 is comprehensively ensured, thereby relatively improving the performance such as the safety performance and sealing performance of the battery.

[0147] As an example, Table 3 below shows the ratio of the minimum length B of the discharge path to the shortest distance A between the two pressure relief mechanisms, the ratio of the minimum length B of the discharge path to the shortest distance A between the two pressure relief mechanisms and the ratio of the volume energy density of the battery cell 20, the maximum temperature of the discharged matter in the second pressure relief mechanism 113, and the relevant experimental data of the state of the housing 110.

[0148]

Table 3

[0149] As can be seen from Table 3 above, when (B / A) / E is less than 0.0015 L / Wh or greater than 0.08 L / Wh, phenomena such as direct firing or seal failure may occur in the housing 110, which may pose a relatively serious safety risk to the battery 10.

[0150] When (B / A) / E is between 0.0010 L / Wh and 0.08 L / Wh, the housing 110 is in a normal state, or only phenomena such as the ejection of a small amount of sparks or swelling appear. The harm caused to the battery 10 by such a small amount of sparks and swelling is relatively small, and the battery 10 can still be in a usable state.

[0151] In some embodiments, the minimum length B of the discharge path, the shortest distance A between the first pressure relief mechanism 213 and the second pressure relief mechanism 113, and the volume energy density E of the battery cell 20 satisfy the relationship of 0.003 L / Wh ≤ (B / A) / E ≤ 0.04 L / Wh. Referring to Table 3 above, in this embodiment, the housing 110 can be in a relatively reliable normal state. In this case, the overall performance of the battery 10 is relatively excellent, and both its safety performance and sealing performance can be ensured to be relatively good.

[0152] In the above embodiment, the design of the minimum length of the discharge path in the present application has been described. Hereinafter, with reference to FIGS. 5 to 23, the design of the related structure of the exhaust passage inside the housing 110 of the present application will be described.

[0153] FIG. 5 shows another structural schematic diagram of the battery 10 according to an embodiment of the present application. Optionally, similar to FIG. 4 above, FIG. 5 may be a top view, a bottom view, or a side view of the battery 10.

[0154] As shown in FIG. 5, in the embodiment of the present application, the battery 10 further includes a surrounding mechanism 30 for surrounding and forming a first exhaust space 310 corresponding to the first pressure relief mechanism 213 of at least one battery cell 20, and an opening 301 communicating with the first exhaust space 310 is provided in the surrounding mechanism 30. The first exhaust space 310 is used to form at least a part of the above-described exhaust passage.

[0155] Optionally, the black structural member in the embodiment shown in FIG. 4 above may be the surrounding mechanism 30 in the embodiment of the present application.

[0156] Optionally, the first exhaust space 310 formed by surrounding with the surrounding mechanism 30 may include a space towards which the first pressure relief mechanism 213 of at least one battery cell 20 is directed. Since the opening 301 is provided in the surrounding mechanism 30, the surrounding mechanism 30 does not realize a fully sealed enclosure, but provides an exhaust outlet to the first exhaust space 310 at the opening 301.

[0157] Optionally, the surrounding mechanism 30 may be a frame structure having an opening 301. By way of example, as shown in FIG. 4, the surrounding mechanism 30 may be a rectangular frame structure, or in other alternative embodiments, the surrounding mechanism 30 may be a frame structure of other shapes, such as a circular frame structure, a polygonal frame structure, etc., and the embodiments of the present application do not limit the specific shape of the frame structure.

[0158] Optionally, as shown in FIG. 5, the surrounding mechanism 30 may be a rectangular frame structure, or in other alternative embodiments, the surrounding mechanism 30 may be a frame structure of other shapes, such as a circular frame structure, a polygonal frame structure, etc., and the embodiments of the present application do not limit the specific shape of the frame structure.

[0159] Alternatively, as shown in FIG. 5, after forming an enclosure around the first pressure relief mechanism 213 of at least one battery cell 20 by the above-described enclosure mechanism 30, a gap may be left between the enclosure mechanism 30 and the housing wall of the housing 110. Accordingly, a second exhaust space 320 can be formed between the enclosure mechanism 30 and the housing wall of the housing 110, and the second exhaust space 320 is connected to the first exhaust space 310 via an opening 301. After the exhaust of at least one battery cell 20 is discharged into the second exhaust space 320 through the opening 301, it is further discharged into the second pressure relief mechanism 113 through the second exhaust space 320. In other words, in this embodiment, the first exhaust space 310 formed by enclosing the first pressure relief mechanism 213 by the enclosure mechanism 30 can be used to form a part of the exhaust passage described above, and the second exhaust space 320 formed between the enclosure mechanism 30 and the housing wall of the housing 110 can be used to form another part of the exhaust passage described above.

[0160] According to the technical solution of the embodiment of the present application, since the enclosure mechanism 30 is provided inside the housing 110 of the battery 10, the enclosure mechanism 30 can form an effective exhaust passage inside the housing 110. By performing related design on the enclosure mechanism 30, it is possible to effectively control the length of the exhaust passage and the minimum length of the exhaust path, so as to meet the safety requirements and performance requirements of the battery 10.

[0161] In some embodiments, the opening 301 of the above-described enclosure mechanism 30 may be located at a position away from the second pressure relief mechanism 113 in the enclosure mechanism 30.

[0162] As can be understood, the surrounding mechanism 30 can be formed by providing an opening 301 in a sealed frame structure. The sealed frame structure may be configured by combining a plurality of surrounding portions arranged along the surrounding direction, and the shapes and sizes of the plurality of surrounding portions are the same. There is a certain distance between each surrounding portion and the second pressure relief mechanism 113, and the average value of the plurality of distances between the plurality of surrounding portions and the second pressure relief mechanism 113 is a. In the plurality of surrounding portions, when the distance between a certain surrounding portion and the second pressure relief mechanism 113 is greater than a, the position of the surrounding portion may be understood as a position away from the second pressure relief mechanism 113 in the surrounding mechanism 30, and an opening 301 may be provided at the position of the surrounding portion.

[0163] According to the technical solution of the embodiment of the present application, by providing the opening 301 at a position away from the second pressure relief mechanism 113 in the surrounding mechanism 30, the distance between the opening 301 and the second pressure relief mechanism 113 can be increased, thereby further extending the discharge path of the discharge of the battery cell 20 inside the housing 110 of the battery 10, further reducing the temperature when the discharge reaches the second pressure relief mechanism 113, and improving the safety performance of the battery 10.

[0164] In some embodiments, the opening 301 of the surrounding mechanism 30 described above may face another housing wall other than the housing wall where the second pressure relief mechanism 113 is located in the housing 110.

[0165] As an example, as shown in FIG. 5, a second pressure relief mechanism 113 is provided on one housing wall in the housing 110, and the opening 301 of the surrounding mechanism 30 may face a housing wall adjacent to the housing wall where the second pressure relief mechanism 113 is located in the housing 110. Alternatively, in another example, the opening 301 may face a housing wall opposite to the housing wall where the second pressure relief mechanism 113 is located in the housing 110. In this exemplary technical solution, the direction of the opening 301 is away from the second pressure relief mechanism 113 or even opposite to the second pressure relief mechanism 113. Therefore, according to this technical solution, the distance between the opening 301 and the second pressure relief mechanism 113 can be increased, thereby further extending the discharge path of the discharge of the battery cell 20 inside the housing 110 of the battery 10.

[0166] In another example, a plurality of second pressure relief mechanisms 113 may be provided in the housing 110. For example, the housing 110 may be provided with second pressure relief mechanisms 113 on two opposite housing walls respectively. In this case, the opening 301 of the surrounding mechanism 30 may face a housing wall other than the two opposite housing walls in the housing 110.

[0167] As an example, the number of the openings 301 shown in FIG. 5 is only one. In other alternative embodiments, the number of the openings 301 may be plural, and all the plural openings 301 face a housing wall other than the housing wall where the second pressure relief mechanism 113 is located in the housing 110.

[0168] According to the technical solution of the embodiment of the present application, the opening 301 of the surrounding mechanism 30 can be designed according to the installation of the second pressure relief mechanism 113 of the housing 110, thereby ensuring that the opening 301 does not face the housing wall where the second pressure relief mechanism 113 is located, increasing the distance between the opening 301 and the second pressure relief mechanism 113, thereby further extending the discharge path of the discharge of the battery cell 20 inside the housing 110 of the battery 10, further reducing the temperature when the discharge reaches the second pressure relief mechanism 113, and improving the safety performance of the battery 10.

[0169] In the embodiment shown in FIG. 5 above, the battery 10 may include only one surrounding mechanism 30, thereby facilitating the installation of the surrounding mechanism 30 within the housing 110. In some other embodiments, the battery 10 may include a plurality of surrounding mechanisms 30 provided at intervals.

[0170] In this case, FIG. 6 shows two other structural schematic diagrams of the battery 10 according to an embodiment of the present application. Similar to FIG. 5 above, optionally, FIG. 6 may be a top view, a bottom view, or a side view of the battery 10.

[0171] As shown in FIG. 6(a), the plurality of battery cells 20 in the battery 10 may include four sets of battery cells 20. Corresponding to the four sets of battery cells 20, the battery 10 may include four surrounding mechanisms 30, and each surrounding mechanism 30 is used to form a first exhaust space 310 corresponding to the first pressure relief mechanism 213 of a set of battery cells 20.

[0172] Also, in the battery 10, the second pressure relief mechanism 113 is provided on two opposing housing walls in the housing 110. In this case, the opening 301 of each surrounding mechanism 30 may face other housing walls in the housing 110 other than the two housing walls where the second pressure relief mechanism 113 is located.

[0173] Optionally, as shown in FIG. 6(a), the relative positions of the four openings 301 of the four surrounding mechanisms 30 in the four surrounding mechanisms 30 may be the same, and the orientations of the four openings 301 may be the same. Or, in other alternative embodiments, the relative positions of the four openings 301 of the four surrounding mechanisms 30 may be different, and the orientations of some of the four openings 301 may be different.

[0174] According to the technical solution of the embodiment of the present application, the plurality of surrounding mechanisms 30 are provided within the housing 110 of the battery 10, and the plurality of surrounding mechanisms 30 can be flexibly installed and adjusted according to actual needs, thereby more easily guiding the emissions of the battery cells 20 at different positions in the housing 110 and further improving the safety performance of the entire battery 10.

[0175] In some embodiments, the opening 301 of the surrounding mechanism 30 described above may be located in the central region of the housing 110.

[0176] As shown in FIG. 6(b), the plurality of battery cells 20 in the battery 10 may include two sets of battery cells 20. Corresponding to the two sets of battery cells 20, the battery 10 may include two surrounding mechanisms 30. Optionally, in the battery 10, the second pressure relief mechanism 113 is provided on two opposite walls of the housing 110. In this case, the opening 301 of each surrounding mechanism 30 may be located in the central region of the housing 110.

[0177] Optionally, the two walls where the second pressure relief mechanism 113 is located may be two walls arranged opposite to each other in the x direction of the housing 110. When the housing 110 is a rectangular housing, the x direction may be the length direction, width direction or height direction of the housing 110. In this case, the opening 301 of each surrounding mechanism 30 may be located in the central region in the x direction of the housing 110.

[0178] According to the technical solution of the above-described embodiment, by locating the opening 301 of the surrounding mechanism 30 in the central region of the housing 110, the distance between the opening 301 and the second pressure relief mechanism 113 located on the housing wall of the housing 110 can also be increased, thereby extending the discharge path of the discharge of the battery cell 20 inside the housing 110 of the battery 10, further reducing the temperature when the discharge reaches the second pressure relief mechanism 113, and improving the safety performance of the battery 10.

[0179] FIG. 7 shows another structural schematic diagram of the battery 10 according to an embodiment of the present application.

[0180] As shown in FIG. 7, the openings of two adjacent surrounding mechanisms 30 among the plurality of surrounding mechanisms 30 are provided on two adjacent walls of the two adjacent surrounding mechanisms 30, and the openings 301 of the two adjacent surrounding mechanisms 30 are provided offset from each other.

[0181] As an example, in two adjacent enclosing mechanisms 30 shown in FIG. 7, one enclosing mechanism 30 is provided with one opening 301, and the other enclosing mechanism 30 is provided with two openings 301. The three openings 301 are provided offset from each other to avoid forming a direct convection between the two first exhaust spaces 310 enclosed by the two enclosing mechanisms 30.

[0182] In the embodiment of the present application, the openings 301 of two adjacent enclosing mechanisms 30 are not provided facing each other, but are provided offset from each other. That is, the exhaust discharged from the opening 301 of the first enclosing mechanism 30 does not enter the first exhaust space 310 formed by the second enclosing mechanism 30 through the opening 301 of the second enclosing mechanism 30, preventing a larger range of influence and damage caused by high-temperature exhaust, preventing the pressure inside the housing 110 from being too high, and guaranteeing the safety performance of the battery 10.

[0183] It should be noted that in the embodiments shown in FIGS. 4 to 7 above, the number of enclosing mechanisms 30 and the number of battery cells 20 enclosed by each enclosing mechanism 30 are merely examples and are not limiting. The number of enclosing mechanisms 30 and the enclosing method may be determined by the number and arrangement method of the battery cells 20 in the battery 10, and the embodiments of the present application do not specifically limit this.

[0184] FIG. 8 shows an exploded structural schematic diagram of the battery 10 according to one embodiment of the present application.

[0185] As shown in FIG. 8, a first pressure relief mechanism 213 is provided on the first wall 201 of at least one battery cell 20. The first wall 201 of the at least one battery cell 20 is provided facing the first housing wall 101 of the housing 110, and the enclosing mechanism 30 is provided between the first housing wall 101 and the first wall 201 of the at least one battery cell 20.

[0186] In this embodiment, the first walls 201 of at least one battery cell 20 may be located in the same plane. According to this arrangement, the surrounding mechanism 30 can be easily provided and attached between the first housing wall 101 and the first walls 201 of at least one battery cell 20, and it is also easy to form the first exhaust space 310 by surrounding the space corresponding to the first pressure relief mechanism 213 of at least one battery cell 20.

[0187] Optionally, as shown in FIG. 8, the surrounding mechanism 30 is attached to the first housing wall 101 of the housing 110 and the first walls 201 of the at least one battery cell 20, and the second pressure relief mechanism 113 is provided on a wall of the housing 110 other than the first housing wall 101.

[0188] By way of example, the housing 110 shown in FIG. 8 may be a rectangular parallelepiped hollow housing having six planar housing walls. The first housing wall 101 of the housing 110 is provided opposite to the first walls 201 of the battery cells 20, and the first housing wall 101 of the housing 110 and the first walls 201 of the battery cells 20 are parallel to each other. The surrounding mechanism 30 may be directly attached between the first housing wall 101 and the first walls 201 of the battery cells 20, or the surrounding mechanism 30 may be indirectly attached between the first housing wall 101 and the first walls 201 of the battery cells 20 (for example, using a rubber layer or a fixing material). The second pressure relief mechanism 113 is not provided on the first housing wall 101, and the second pressure relief mechanism 113 may be provided on any housing wall other than the first housing wall 101.

[0189] The first exhaust space 310 formed by surrounding between the first housing wall 101 and the first wall 201 of the battery cell 20 by the surrounding mechanism 30 is a space sealed in a first direction perpendicular to the first wall 201 of the battery cell 20 and is a space having an opening in a second direction parallel to the first wall 201 of the battery cell 20. Since the second pressure relief mechanism 113 is provided on a housing wall other than the first housing wall 101, the exhaust of the battery cell 20 discharged through the first pressure relief mechanism 213 cannot be discharged through the first housing wall 101 in the first direction, but moves along the second direction and is discharged through the opening in the second direction of the first exhaust space 310 and the second pressure relief mechanism 113 located on the other housing wall.

[0190] According to the technical solution of the embodiment of the present application, not only is the surrounding mechanism 30 easy to stably attach to the housing 110, but also the direction of the exhaust of the at least one battery cell 20 can be easily guided by the surrounding mechanism 30, extending the exhaust path inside the housing 110 of the exhaust and improving the safety performance of the battery 10.

[0191] Optionally, in some embodiments, as shown in FIG. 8, the second housing wall 102 of the housing 110 intersects the first housing wall 101 of the housing 110, and the second pressure relief mechanism 113 is provided on the second housing wall 102. A second exhaust space 320 is formed between the surrounding mechanism 30 and the second housing wall 102, and the second exhaust space 320 is connected to the first exhaust space 310 through the opening 301, and the exhaust of the at least one battery cell 20 enters the second exhaust space 320 through the opening 301 and is discharged to the second pressure relief mechanism 113.

[0192] Specifically, in the technical solution of this embodiment, the housing 110 may have four second housing walls 102 that intersect the first housing wall 101 of the housing 110. For example, when the first housing wall 101 of the housing 110 is the top wall or the bottom wall of the housing 110, the four second housing walls 102 may be the side walls of the housing 110. The number of the second pressure relief mechanisms 113 may be one or more, and the one or more second pressure relief mechanisms 113 may be provided on any one or more of the four second housing walls 102.

[0193] After the surrounding mechanism 30 forms a first exhaust space 310 by surrounding between the first housing wall 101 and the first wall 201 of the battery cell 20, a second exhaust space 320 may be formed between the surrounding mechanism 30 and the second housing wall 102. The second exhaust space 320 is used to communicate the first exhaust space 310 with the second pressure relief mechanism 113 located on the second housing wall 102.

[0194] In the technical solution of this embodiment, the first exhaust space 310 and the second exhaust space 320 are partitioned inside the housing 110 by the surrounding mechanism 30. Since the second exhaust space 320 communicates with the second housing wall 102 of the housing 110, the position of the second pressure relief mechanism 113 on the second housing wall 102 of the housing 110 can be easily designed, which is advantageous for further extending the discharge path of the discharge product inside the housing 110 and ensuring the safety performance of the battery 10.

[0195] Corresponding to the exploded view of the embodiment shown in FIG. 8 described above, FIG. 9 shows a schematic plan view of the battery 10 in FIG. 8.

[0196] As shown in FIGS. 8 and 9, in some embodiments, at least one battery cell 20 is arranged to form a battery cell assembly. Two electrode terminals 214 are provided on the first wall 201 of each battery cell 20 in the battery cell assembly, and the first pressure relief mechanism 213 is provided between the two electrode terminals 214. The surrounding mechanism 30 is provided between the two electrode terminals 214 of each battery cell in the battery cell assembly.

[0197] By way of example, in the embodiment shown in FIGS. 8 and 9, a plurality of battery cells 20 are arranged in a row along the width direction of the battery cell 20, and the row of battery cells 20 may be understood as one battery cell assembly. Alternatively, in other examples, a plurality of battery cells 20 may form one battery cell assembly in other arrangement manners, and the embodiments of the present application do not limit the specific arrangement manner of the battery cells 20 in the battery cell assembly.

[0198] A first pressure relief mechanism 213 and two electrode terminals 214 are provided on a first wall 201 of each battery cell 20 in the battery cell assembly. The surrounding mechanism 30 is provided close to the first pressure relief mechanism 213 of each battery cell 20 in the battery cell assembly, surrounds the space corresponding to the first pressure relief mechanism 213, and further, the surrounding mechanism 30 may be provided between the two electrode terminals 214 of each battery cell 20 in the battery cell assembly.

[0199] According to the technical solution of this embodiment, since the distance from the first pressure relief mechanism 213 of the surrounding mechanism 30 is relatively close, the surrounding mechanism 30 can play a role in well shielding and guiding the discharge from the first pressure relief mechanism 213. Also, the surrounding mechanism 30 can prevent the discharge from the first pressure relief mechanism 213 from affecting the electrode terminal 214 or other members of the battery cell 20, further guaranteeing the safety performance of the battery 10.

[0200] Optionally, when the electrode terminal 214 of the battery cell 20 and the first pressure relief mechanism 213 are located on the same wall, as another alternative embodiment, the surrounding mechanism 30 may simultaneously surround the space corresponding to the two electrode terminals 214 and the first pressure relief mechanism 213 of the battery cell 20. According to the technical solution of this embodiment, the surrounding mechanism 30 can also realize the role of shielding and guiding the discharge discharged through the first pressure relief mechanism 213 of the first wall 201, and extend the discharge path of the discharge inside the housing 110.

[0201] FIG. 8 and FIG. 9 above show a schematic structural diagram in which one embodiment of the present application includes one surrounding mechanism 30, and FIGS. 10 and 11 below show a schematic structural diagram in which another embodiment of the present application includes a plurality of surrounding mechanisms 30. FIG. 10 is another schematic exploded view of the battery 10 according to one embodiment of the present application, and FIG. 11 is a top view of the battery 10 in FIG. 10.

[0202] As shown in FIGS. 10 and 11, in the embodiment of the present application, the battery 10 may include a plurality of sets of battery cells 20, and each set of battery cells 20 may include a battery cell assembly formed by arranging at least one battery cell 20 as shown in FIGS. 8 and 9. One surrounding mechanism 30 is surrounded in the space corresponding to the first pressure relief mechanism 213 of each set of battery cells 20.

[0203] Each of the plurality of surrounding mechanisms 30 may be directly attached to the first housing wall 101 of the housing 110 and the first wall 201 of a set of battery cells 20. Specifically, for the related technical solution between the surrounding mechanism 30 and a set of battery cells 20, reference may be made to the related description of the embodiments shown in FIGS. 8 and 9 above, and no further explanation will be given here.

[0204] Optionally, in some embodiments, a cross member 114 may be provided on the housing 110 of the battery 10, and the cross member 114 can partition the internal space of the housing 110 into a plurality of sub-spaces, and each sub-space is used to accommodate a set of battery cells 20. By way of example, as shown in FIGS. 10 and 11, two cross members 114 intersecting on the housing 110 are provided, and the two cross members 114 partition the internal space of the housing 110 into four sub-spaces.

[0205] Optionally, in order to easily discharge the exhaust of the battery cells 20 in each sub-space, one second pressure relief mechanism 113 may be provided on the housing wall corresponding to each sub-space. For example, as in the embodiment shown in FIG. 10, in two opposite second housing walls 102 of the housing 110, two second pressure relief mechanisms 113 may be provided on each second housing wall 102, that is, a total of four second pressure relief mechanisms 113 are provided on the housing wall of the housing 110.

[0206] Optionally, as shown in FIGS. 10 and 11, the openings 301 of the plurality of surrounding mechanisms 30 may be provided to be located in the central region of the housing 110. Or, in other embodiments, the openings 301 of the plurality of surrounding mechanisms 30 may face other housing walls of the housing 110 other than the housing wall where the second pressure relief mechanism 113 is located.

[0207] In other embodiments, other members may be provided between the first housing wall 101 of the housing 110 and the first wall 201 of at least one battery cell 20, except for the technical solution in which the surrounding mechanism 30 shown in FIGS. 8 to 11 above is attached to the first housing wall 101 of the housing 110 and the first wall 201 of at least one battery cell 20. The surrounding mechanism 30 may be attached between the member and the first wall 201 of at least one battery cell 20.

[0208] FIG. 12 shows another exploded schematic view of the battery 10 according to one embodiment of the present application.

[0209] As shown in FIG. 12, in the embodiment of the present application, an isolation member 40 is provided between the first housing wall 101 of the housing 110 and the first wall 201 (not shown) of at least one battery cell 20. The isolation member 40 is used to form an electrical chamber and an exhaust chamber that are mutually isolated inside the housing 110. The electrical chamber is used to accommodate at least one battery cell 20 (not shown). The surrounding mechanism 30 is provided in the exhaust chamber, and the surrounding mechanism 30 is attached to the first housing wall 101 and the isolation member 40 of the housing 110. The surrounding mechanism 30 is used to surround and form a first exhaust space 310 corresponding to the first pressure relief mechanism 213 (not shown) of at least one battery cell 20 in the exhaust chamber.

[0210] Specifically, in the technical solution of this embodiment, the isolation member 40 isolates the internal space of the housing 110 into an electrical chamber and an exhaust chamber. That is, inside the housing 110, the electrical chamber for accommodating at least one battery cell 20 and the exhaust chamber for collecting and discharging the exhaust of at least one battery cell 20 are separated. In this way, when an abnormality occurs in the battery cell 20, the exhaust of the battery cell 20 first enters the exhaust chamber, and the exhaust does not directly affect the electrical components in the electrical chamber, so the safety of the battery can be further improved.

[0211] Optionally, in some embodiments, the isolation member 40 may have a wall shared by the electrical chamber and the exhaust chamber. For example, the isolation member 40 may simultaneously be one wall of the electrical chamber and one wall of the exhaust chamber. In this way, the emissions of the battery cell 20 can directly enter the exhaust chamber through the isolation member 40, avoiding affecting performance parameters such as the energy density of the battery 10 by introducing other structural members into the housing 110.

[0212] Furthermore, the surrounding mechanism 30 is provided in the exhaust chamber and is attached to the first housing wall 101 of the housing 110 and the isolation member 40. The surrounding mechanism 30 forms a first exhaust space 310 between the first housing wall 101 and the isolation member 40 to receive and guide the emissions discharged within the housing 110.

[0213] According to the technical solution of the embodiment of the present application, since the housing 110 is partitioned into an electrical chamber and an exhaust chamber isolated from each other by the isolation member 40, the emissions of the battery cell 20 in the electrical chamber are first discharged into the exhaust chamber through the isolation member 40, without directly affecting the electrical configuration of the battery cell 20 in the electrical chamber, thereby further improving the safety performance of the battery 10. Furthermore, the surrounding mechanism 30 is provided in the exhaust chamber to guide the emissions, and the emissions can be discharged only from the opening 301 in the surrounding mechanism 30, extending the discharge path of the emissions inside the housing 110 and further improving the safety performance of the battery 10.

[0214] Optionally, the second pressure relief mechanism 113 may be provided on any one housing wall of the housing 110. Regarding the specific position of the second pressure relief mechanism 113, an exhaust passage communicating with the second pressure relief mechanism 113 and the first exhaust space 310 may be designed inside the housing 110.

[0215] For example, the second pressure relief mechanism 113 may be provided on the housing wall corresponding to the electrical chamber in the housing 110. In this case, a passage communicating the electrical chamber and the first exhaust space 310 may be designed in the isolation member 40, extending the discharge path of the emissions inside the housing 110.

[0216] Alternatively, the second pressure relief mechanism 113 may be provided on the housing wall corresponding to the exhaust chamber in the housing 110, and the discharge can be easily discharged from the exhaust chamber, and the discharge does not affect the electrical components in the electrical chamber.

[0217] Optionally, the second pressure relief mechanism 113 may be provided on other housing walls of the housing 110 other than the first housing wall 101.

[0218] Specifically, in the embodiment of the present application, the first housing wall 101 and the isolation member 40 may be used to form two walls facing each other in the exhaust chamber. After the discharge of the battery cell 20 passes through the isolation member 40, most of it directly impacts the first housing wall 101. Therefore, the second pressure relief mechanism 113 is provided on other housing walls rather than on the first housing wall 101, extending the discharge path of the discharge inside the housing 110, thereby improving the safety of the battery 10.

[0219] Optionally, in some embodiments, after the battery 10 is attached to the power-consuming device, the first housing wall 101 of the battery 10 may be the bottom wall of the housing 110, and the first wall 201 where the first pressure relief mechanism 213 of at least one battery cell 20 is provided may be referred to as the bottom wall of the at least one battery cell 20. The isolation member 40 can partition the internal space of the housing 110 into two spaces, and the electrical chamber is located below the exhaust chamber. Alternatively, in some other alternative embodiments, the electrical chamber may be located above or in other directions of the exhaust chamber, and the embodiments of the present application do not specifically limit the relative positional relationship between the electrical chamber and the exhaust chamber.

[0220] Optionally, continuing to refer to FIG. 12, as shown in FIG. 12, in some embodiments, a pressure relief region 410 corresponding to the first pressure relief mechanism 213 of at least one battery cell 20 is formed in the isolation member 40, and the discharge of the at least one battery cell 20 is discharged into the exhaust chamber through the pressure relief region 410, and the enclosure mechanism 30 is used to form by surrounding the first exhaust space 310 corresponding to the pressure relief region 410 in the exhaust chamber.

[0221] Optionally, at least one pressure relief area 410 is provided in the isolation member 40, and each pressure relief area may be provided opposite to the first pressure relief mechanism 213 of one battery cell 20. When the first pressure relief mechanism 213 operates, the discharge inside the battery cell 20 is discharged through the pressure relief area 410.

[0222] In some embodiments, the pressure relief area 410 in the isolation member 40 may be specially treated so that it can be easily broken when the first pressure relief mechanism 213 operates. As one example, the pressure relief area 410 may be a fragile area, and its strength is smaller than that of other areas in the isolation member 40 other than the pressure relief area 410.

[0223] Optionally, a concave groove provided opposite to the first pressure relief mechanism 213 is provided in the isolation member 40, and a fragile area is formed on the bottom wall of the concave groove. Since the bottom wall of the concave groove is weaker than other areas of the isolation member 40, it is easily broken by the discharge, and when the first pressure relief mechanism 213 operates, the discharge can break the bottom wall of the concave groove and enter the exhaust chamber.

[0224] Optionally, a fragile area may be formed in the isolation member 40 in other ways as the pressure relief area 410. For example, a cut may be provided in the isolation member 40 to form a fragile area, and the present application does not specifically limit this.

[0225] The surrounding mechanism 30 is used to surround the space corresponding to the pressure relief area 410 of the isolation member 40, so that it can receive the discharge discharged through the first pressure relief mechanism 213 and the pressure relief area 410 and guide the path of the discharge.

[0226] According to the technical solution of this embodiment, by providing the pressure relief area 410 in the isolation member 40, the discharged matter discharged from the first pressure relief mechanism 213 can be effectively passed through, and it can be prevented that the discharged matter affects the electrical components in the electrical chamber. The surrounding mechanism 30 can surround the space corresponding to the pressure relief area 410 to indirectly surround the space corresponding to the first pressure relief mechanism 213 of the battery cell 20, thereby effectively guiding the discharged matter and comprehensively ensuring the safety performance of the battery 10.

[0227] Optionally, in the embodiment of the above application, the isolation member 40 may be a thermal management member for adjusting the temperature of the battery cell 20. Optionally, the thermal management member may be used to contain a fluid to adjust the temperatures of a plurality of battery cells. The fluid here may be a liquid or a gas, and adjusting the temperature means heating or cooling a plurality of battery cells. When cooling or lowering the temperature of the battery cell, the thermal management member is used to contain a cooling fluid to lower the temperatures of a plurality of battery cells. In this case, the thermal management member may be called a cooling member, a cooling system or a cooling plate, etc., and the contained fluid may be called a cooling medium or a cooling fluid, and more specifically, it may be called a coolant or a cooling gas. Also, the thermal management member may be used to heat a plurality of battery cells to increase their temperatures, and the embodiments of the present application do not limit this. Optionally, the above-mentioned fluid may circulate and flow to achieve a better temperature adjustment effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, or air, etc.

[0228] According to the technical solution of this embodiment, by using the thermal management member as the isolation member 40 at the same time, the electrical chamber and the exhaust chamber that are isolated from each other in the housing 110 can be partitioned to ensure the safety of the battery 10. Also, due to the presence of the thermal management member, the battery cell 20 can be further thermally managed to further improve the safety performance of the battery 10.

[0229] FIG. 13 shows a schematic bottom view of the battery 10 in FIG. 12.

[0230] As shown in FIG. 13, the battery 10 may include a plurality of surrounding mechanisms 30. Each surrounding mechanism 30 is used to surround a space corresponding to a set of pressure relief regions 410, and the set of pressure relief regions 410 corresponds to the first pressure relief mechanism 213 of a set of battery cells 20.

[0231] By way of example, FIG. 13 shows two adjacent surrounding mechanisms 30, and the openings 301 of the two surrounding mechanisms 30 may be located in the central region of the exhaust chamber. Alternatively, in an alternative embodiment, the openings 301 of the two surrounding mechanisms 30 may be designed in other ways.

[0232] For example, FIG. 14 shows two schematic structural diagrams of surrounding a pressure relief region 410 by a surrounding mechanism 30 according to an embodiment of the present application.

[0233] As shown in FIG. 14(a), in this embodiment, the installation method of the two surrounding mechanisms 30 is the same as that in FIG. 13, but the opening 301 is smaller than the opening 301 shown in FIG. 13. According to the technical solution of this embodiment, the surrounding mechanism 30 can play a role in better guiding the exhaust, thereby further extending the exhaust path of the exhaust in the exhaust chamber.

[0234] As shown in FIG. 14(b), in this embodiment, two openings 301 may be provided in one of the two surrounding mechanisms 30, and one opening 301 may be formed in the other surrounding mechanism 30. The three openings 301 are provided offset from each other to avoid forming a direct convection between the two first exhaust spaces 310 corresponding to the two surrounding mechanisms 30, prevent a larger range of influence and damage caused by high-temperature exhaust, and prevent the pressure in the first exhaust space 310 from being too high, thereby guaranteeing the safety performance of the battery 10.

[0235] It should be noted that FIGS. 13 and 14 merely exemplify the surrounding manner of the pressure relief region 410 by two adjacent surrounding mechanisms 30. In other alternative embodiments, the number of the surrounding mechanisms 30 may be one or three or more, and the installation manner of the openings 301 of the surrounding mechanisms 30 may be associated with the second pressure relief mechanism 113. For specific design solutions, reference may be made to the relevant descriptions of the above embodiments, and no further description will be given here.

[0236] After forming the surrounding mechanism 30 in the above embodiment, optionally, a first filtration hole 302 for filtering solid particles in the exhaust is further formed in the surrounding mechanism 30. Optionally, the aperture diameter of the exhaust hole is smaller than the radial dimension of the opening 301.

[0237] As an example, FIG. 15 shows another two schematic structural diagrams of the battery 10 according to an embodiment of the present application. Optionally, FIG. 15(a) may be a top view of the embodiment shown in FIG. 10, and FIG. 15(b) may be a bottom view of the embodiment shown in FIG. 12.

[0238] As shown in FIG. 15, in addition to having an opening 301 with a relatively large dimension, the surrounding mechanism 30 is further formed with a plurality of first filtration holes 302 with relatively small dimensions, and the plurality of first filtration holes 302 may be distributed at equal intervals or non-equal intervals in the surrounding mechanism 30. Optionally, the position design and layout of the first filtration holes 302 may be the same as the relevant design of the above opening 301. For example, the first filtration holes 302 may be provided at positions away from the second pressure relief mechanism 113 in the surrounding mechanism 30, and / or the first filtration holes 302 may face other housing walls of the housing 110 except the housing wall where the second pressure relief mechanism 113 is located.

[0239] Similar to the role of the opening 301, the first filtering hole 302 may be used to discharge the emissions discharged from the battery cell 20 through the first pressure relief mechanism 213. However, the first filtering hole 302 is mainly used to allow the gas in the emissions to pass through. Solid particles with a relatively large particle size in the emissions are filtered by the first filtering hole 302, and the solid particles cannot be discharged outside the first exhaust space 310 through the first filtering hole 302. Therefore, according to this technical solution, the high-temperature solid particles discharged to the second pressure relief mechanism 113 can be reduced, and the safety of the battery 10 can be further improved.

[0240] Moreover, by providing the first filtering hole 302 in the surrounding mechanism 30, the exhaust speed and the pressure relief speed of the first exhaust space 310 can be accelerated, and it is possible to prevent the pressure in the first exhaust space 310 from being too high. At the same time, when the number of the first filtering holes 302 is plural, the airflows discharged from the plurality of first filtering holes 302 collide with each other, thereby generating a certain degree of spoiler effect, and thereby reducing the harm caused by the direct impact of the gas.

[0241] Optionally, in some embodiments, the surrounding mechanism 30 may have an intermittent configuration. The surrounding mechanism 30 is formed by a plurality of surrounding portions, and the gap between two adjacent surrounding portions among the plurality of surrounding portions forms the above-mentioned first filtering hole 302.

[0242] According to the technical solution of this embodiment, after forming the first filtering hole 302, the intermittent design of the surrounding mechanism 30 improves the processing convenience, and it is not necessary to integrally form the surrounding mechanism 30. The surrounding mechanism 30 can be formed by manufacturing a plurality of surrounding sub-structures respectively.

[0243] Optionally, the diameter D of the first filtering hole and the volume energy density E of the battery cell 20 satisfy the relationship of 0.0001 mm / (Wh / L) ≤ D / E ≤ 0.006 mm / (Wh / L), the unit of D is mm, and the unit of E is Wh / L.

[0244] Specifically, the diameter of the first filtration hole 302 needs to be equal to or less than a preset value so that the first filtration hole 302 does not become the main flow path, that is, so that the surrounding mechanism 30 does not fail. After the surrounding mechanism 30 fails, it cannot effectively shield and guide the solid particles in the discharge, so a large amount of solid particle matter may quickly escape from the second pressure relief mechanism 113, possibly causing knocking outside the battery 10.

[0245] Also, the diameter of the first filtration hole 302 needs to be equal to or greater than a preset value so that the gas in the discharge can pass through the first filtration hole 302 at a certain speed and play a role in relieving the pressure in the first exhaust space 310.

[0246] As an example, Table 4 below shows the experimental data related to the ratio of the diameter D of the first filtration hole to the volume energy density E of the battery cell 20 and the state of the housing 110.

[0247]

Table 4

[0248] As can be seen from Table 4 above, when D / E is less than 0.0001 mm / (Wh / L) or greater than 0.006 mm / (Wh / L), phenomena such as direct fire or seal failure may occur in the housing 110, posing a relatively serious safety risk to the battery 10.

[0249] When D / E is equal to or greater than 0.0001 mm / (Wh / L) and equal to or less than 0.006 mm / (Wh / L), the housing 110 is in a normal state, or only phenomena such as the ejection of a small amount of sparks appear. The harm of such a small amount of sparks to the battery 10 is relatively small, and the battery 10 can still be in a usable state.

[0250] In some embodiments, D / E can satisfy the relationship of 0.0001 mm / (Wh / L) ≤ D / E ≤ 0.003 m / (Wh / L). Referring to the above table, in this embodiment, the housing 110 can be in a normal state relatively reliably. In this case, the overall performance of the battery 10 is relatively excellent, and both its safety performance and sealing performance can be ensured relatively well.

[0251] Therefore, according to the technical solution of the embodiments of the present application, the size of the first filtration hole 302 can be designed according to the volume energy density of the battery cell 20. The first filtration hole 302 is adapted to the situation where thermal runaway occurs in the battery cell 20, and plays a good role in solid filtration and exhaust in the surrounding mechanism 30, and can comprehensively improve the safety performance of the battery 10.

[0252] Optionally, in the embodiments of the above application, the melting point of the material of the surrounding mechanism 30 is 200°C or higher.

[0253] In some embodiments, the material of the surrounding mechanism 30 may be a metal material and may have a melting point of 300°C or higher. The surrounding mechanism 30 can be applied to the battery 10 with a relatively high energy density. Optionally, the material of the surrounding mechanism 30 may be a non-metallic material, such as rubber, mica, carbon fiber, melamine polon, or foamed polyurethane. In this case, the carbonization temperature of the surrounding mechanism 30 is 200°C or higher.

[0254] According to the technical solution of this embodiment, the material of the surrounding mechanism 30 is a high-temperature resistant material, which can withstand the impact of high-temperature exhaust discharged from the battery cell 20, prevent the high-temperature exhaust from affecting the reliability in the use of the surrounding mechanism 30, and comprehensively ensure the safety performance of the battery 10.

[0255] As described above, while referring to FIGS. 5 to 15, the related technical solutions of the surrounding mechanism 30 for forming the exhaust passage in the embodiments of the present application have been described. Hereinafter, while referring to FIGS. 16 to 23, other technical solutions for forming the exhaust passage in the embodiments of the present application will be described.

[0256] FIG. 16 shows another structural schematic diagram of the battery 10 according to one embodiment of the present application. Optionally, FIG. 16 may be a top view, a bottom view, or a side view of the battery 10.

[0257] As shown in FIG. 16, in the embodiment of the present application, at least one housing wall of the housing 110 is a hollow housing wall 103. A second pressure relief mechanism 113 is provided on the outer surface 1102 of the hollow housing wall 103, an exhaust port 115 is provided on the inner surface 1101 of the hollow housing wall 103, and at least a part of the above-described exhaust passage is formed in the internal space between the inner surface 1101 and the outer surface 1102 of the hollow housing wall 103.

[0258] Specifically, in the embodiment of the present application, the housing 110 has at least one hollow housing wall 103. The internal space between the inner surface 1101 and the outer surface 1102 of the hollow housing wall 103 is a hollow space. The inner surface 1101 of the hollow housing wall 103 is the surface facing the accommodation space inside the housing 110 in the hollow housing wall 103. Correspondingly, the outer surface 1102 of the hollow housing wall 103 is the surface facing the external space of the housing 110 in the hollow housing wall 103. By using the internal space between the inner surface 1101 and the outer surface 1102 of the hollow housing wall 103, a part of the exhaust passage for discharging the discharge of the battery cell 20 in the housing 110 can be formed.

[0259] Specifically, an exhaust port 115 is provided on the inner surface 1101 of the hollow housing wall 103, and the exhaust port 115 communicates with the internal space of the hollow housing wall 103. Further, a second pressure relief mechanism 113 is provided on the outer surface 1102 of the hollow housing wall 103, and the second pressure relief mechanism 113 communicates with the exhaust port 115 via the internal space of the hollow housing wall 103. Therefore, when the first pressure relief mechanism 213 of the battery cell 20 operates to release the discharge, the discharge is discharged to the exhaust port 115 located on the inner surface 1101 of the hollow housing wall 103 through the internal space of the housing 110, and then is discharged to the second pressure relief mechanism 113 located on the outer surface 1102 of the hollow housing wall 103 via the internal space of the hollow housing wall 103. The internal space of the housing 110 is used to form a part of the exhaust passage for passing the discharge, and the internal space of the hollow housing wall 103 of the housing 110 is used to form another part of the exhaust passage.

[0260] According to the technical solution of the embodiment of the present application, the exhaust passage for the discharge can be formed by using the hollow housing wall 103 of the housing 110, thereby saving the internal space of the housing 110 and improving the energy density of the battery 10.

[0261] Optionally, in the embodiment of the above application, at least two housing walls of the housing 110 are the hollow housing walls 103, and the exhaust port 115 and the second pressure relief mechanism 113 may be provided on different hollow housing walls 103 in the housing 110.

[0262] As an example, as shown in FIG. 16, the exhaust port 115 and the second pressure relief mechanism 113 may be provided on two opposing hollow housing walls 103 in the housing 110. The exhaust port 115 is provided on the inner surface 1101 of one hollow housing wall 103, and the second pressure relief mechanism 113 is provided on the outer surface 1102 of the other hollow housing wall 103. The internal spaces of the two hollow housing walls 103 may communicate via other members in the housing 110. For example, they may communicate via other hollow housing walls 103 of the housing 110.

[0263] Alternatively, in another example, the exhaust port 115 and the second pressure relief mechanism 113 may be provided on the same hollow housing wall 103 of the housing 110. That is, the exhaust port 115 and the second pressure relief mechanism 113 are respectively provided on the inner surface 1101 and the outer surface 1102 of the same hollow housing wall 103, and they are provided offset from each other.

[0264] According to the technical solution of this embodiment, the exhaust port 115 and the second pressure relief mechanism 113 are provided on different hollow housing walls 103 of the housing 110, or the exhaust port 115 and the second pressure relief mechanism 113 provided on the same hollow housing wall 103 are provided offset from each other, which is advantageous for extending the discharge path inside the housing wall of the housing 110 for the discharge of the battery cell 20, reducing the temperature when the discharge reaches the second pressure relief mechanism 113, and improving the safety performance of the battery 10.

[0265] FIG. 17 shows another structural schematic diagram of the battery 10 according to an embodiment of the present application. Optionally, FIG. 17 may be a top view, a bottom view, or a side view of the battery 10.

[0266] As shown in FIG. 17, in the embodiment of the present application, at least one housing wall of the housing 110 is a hollow housing wall 103, the second pressure relief mechanism 113 is provided on the outer surface 1102 of the hollow housing wall 103, the battery 10 further includes a hollow cross member 104, the exhaust port 115 is provided on the inner surface 1101 of the hollow cross member 104 and / or the hollow housing wall 103, the internal space of the hollow cross member 104 communicates with the internal space of the hollow housing wall 103, and at least a part of the exhaust passage is formed in the internal space of the hollow cross member 104 and the internal space of the hollow housing wall 103.

[0267] Specifically, the hollow cross member 104 in the battery 10 is provided in the internal space of the housing 110 so as to partition a plurality of battery cells 20 accommodated in the internal space of the housing 110. At least one end of the hollow cross member 104 may be attached to at least one hollow housing wall 103 of the housing 110, and the internal space of the hollow housing wall 103 may communicate with the internal space of the hollow cross member 104.

[0268] As an example, as shown in FIG. 17, an exhaust port 115 is provided in the hollow cross member 104. The exhaust port 115 may be used to receive the emissions of the battery cell 20. The emissions may enter the internal space of the hollow cross member 104 through the exhaust port 115, and further be discharged into the internal space of the hollow housing wall 103 communicating with the internal space of the hollow cross member 104. By means of the internal space of the hollow housing wall 103, the emissions can be successively discharged to the second pressure relief mechanism 113 located on the outer surface 1102 of the hollow housing wall 103 and then discharged to the outside of the housing 110.

[0269] In another example, except that the exhaust port 115 can be provided in the hollow cross member 104, it may be provided only on the inner surface 1101 of the hollow housing wall 103, or a plurality of exhaust ports 115 may be respectively provided on the inner surfaces of the hollow cross member 104 and the hollow housing wall 103. According to this exemplary technical solution, the emissions may be discharged to the second pressure relief mechanism 113 through the internal space of the hollow housing wall 103 and the internal space of the hollow cross member 104 and then discharged to the outside of the housing 110.

[0270] In the technical solution of this embodiment, the internal space of the hollow housing wall 103 and / or the hollow cross member 104 of the housing 110 can be utilized to form a part of the exhaust passage for the emissions, saving the internal space of the housing 110 and improving the energy density of the battery 10. In addition, the discharge path of the emissions inside the housing 110 can be further extended, improving the safety performance of the battery 10.

[0271] Optionally, in some embodiments, when the number of at least one battery cell 20 in the battery 10 is plural, the plural battery cells 20 include plural sets of battery cells 20. The hollow cross member 104 is used to partition the internal space of the housing 110 into plural sub-spaces. The plural sub-spaces are respectively used to accommodate the plural sets of battery cells 20. Exhaust ports 115 are respectively provided in the hollow cross member 104 corresponding to each of the plural sub-spaces, and / or exhaust ports 115 are respectively provided on the inner surface 1101 of the hollow housing wall 103 corresponding to each of the plural sub-spaces.

[0272] By way of example, as shown in FIG. 17, the battery 10 may include two hollow cross members 104 and four hollow housing walls 103 provided perpendicular to each other. The end faces of the hollow cross members 104 may be attached to the hollow housing walls 103 of the housing 110, and the internal space of the hollow cross members 104 may communicate with the internal space of the hollow housing walls 103. The two hollow cross members 104 can partition the internal space of the housing 110 into four sub-spaces, and each sub-space is used to accommodate a set of battery cells 20.

[0273] Optionally, the four sub-spaces may be isolated from each other and may not communicate with each other. In order to facilitate the effective discharge of the exhaust of the battery cells 20 accommodated in each sub-space to the outside of the housing 110, one exhaust port 115 corresponding to each sub-space is provided in the hollow cross member 104. For example, in the embodiment shown in FIG. 17, four exhaust ports 115 may be provided in the same hollow cross member 104, and the four exhaust ports 115 correspond one-to-one to the four sub-spaces. Optionally, in the embodiment shown in FIG. 17, the second pressure relief mechanism 113 is provided on two opposing hollow housing walls 103, and the hollow cross member 104 provided with the exhaust port 115 may be located between the two opposing hollow housing walls 103 and parallel to the two opposing hollow housing walls 103.

[0274] Optionally, in the above embodiment, in the plurality of sub-spaces partitioned by the housing 110 by the hollow cross member 104, one exhaust port 115 is correspondingly provided in each sub-space. Or, in other alternative embodiments, a plurality of exhaust ports 115 may be correspondingly provided in each sub-space.

[0275] FIG. 18 shows three other structural schematic diagrams of the battery 10 according to an embodiment of the present application.

[0276] As shown in FIG. 18, the internal space of the housing 110 is partitioned into four sub-spaces by two mutually perpendicular hollow cross members 104, and eight exhaust ports 115 may be provided on the inner surface 1101 of the hollow cross member 104 and / or the hollow housing wall 103 among the two hollow cross members 104. Each two of the eight exhaust ports 115 correspond to one space inside the housing 110.

[0277] Optionally, similar to the embodiment shown in FIG. 17 described above, in the embodiment shown in FIG. 18(a), the eight exhaust ports 115 are distributed and provided on one of the two hollow cross members 104, and the second pressure relief mechanism 113 is provided on two opposing hollow housing walls 103. The hollow cross member 104 on which the exhaust ports 115 are provided may be located between the two opposing hollow housing walls 103 and parallel to the two opposing hollow housing walls 103.

[0278] In the embodiment shown in FIG. 18(b), the eight exhaust ports 115 are distributed and provided on the other of the two hollow cross members 104, and the second pressure relief mechanism 113 is provided on two opposing hollow housing walls 103. The hollow cross member 104 on which the exhaust ports 115 are provided may be connected to the two opposing hollow housing walls 103 and perpendicular.

[0279] In the embodiment shown in FIG. 18(c), the eight exhaust ports 115 are distributed and provided on the inner surface 1101 of the hollow housing wall 103 of the housing 110.

[0280] According to the technical solution of the embodiment of the present application, when the internal space of the housing 110 is partitioned into a plurality of sub-spaces by the hollow cross member 104, it is advantageous to reduce or prevent the battery cells 20 accommodated in each sub-space from affecting the battery cells 20 accommodated in other sub-spaces, and improve the safety performance of the battery 10. Furthermore, in order to ensure that the emissions of the battery cells 20 accommodated in each sub-space can be discharged smoothly, exhaust ports 115 are provided on the inner surface 1101 of the hollow cross member 104 and / or the hollow housing wall 103, thereby further improving the safety performance of the battery 10.

[0281] FIG. 19 shows another schematic exploded view of the battery 10 according to one embodiment of the present application. Optionally, FIG. 18(a) above may be a schematic plan view of the battery 10 of the embodiment shown in FIG. 19.

[0282] In the embodiment of the application shown in FIG. 19, the internal space of the housing 110 of the battery 10 may form an electrical chamber, which is used to accommodate at least one battery cell 20. When the first pressure relief mechanism 213 operates in the battery cell 20, the discharged emissions enter the electrical chamber, and the related installations of the hollow housing wall 103, the hollow cross member 104, the exhaust port 115, and the second pressure relief mechanism 113 are all designed in relation to the electrical chamber.

[0283] Optionally, in the embodiment shown in FIG. 19, the first pressure relief mechanism 213 of the battery cell 20 is provided towards the first housing wall 101 of the housing 110, and the exhaust port 115 may be provided in a region of the hollow cross member 104 close to the first housing wall 101. Alternatively, in other alternative embodiments, the exhaust port 115 may be provided at other positions of the hollow cross member 104, and the embodiments of the present application are not specifically limited thereto.

[0284] Alternatively, in the embodiment shown in FIG. 19, the first housing wall 101 of the housing 110 may be a solid wall, the hollow housing wall 103 may be four housing walls intersecting the first housing wall 101, the internal spaces of the four hollow housing walls 103 may communicate with each other, and the internal space of the hollow cross member 104 may communicate with the internal spaces of the four hollow housing walls 103.

[0285] FIG. 20 shows another schematic exploded view of the battery 10 according to an embodiment of the present application. FIG. 21 shows a schematic bottom view of the battery 10 shown in FIG. 20 and a schematic cross-sectional view taken along the A-A' direction.

[0286] As shown in FIGS. 20 and 21, in the embodiment of the present application, the battery 10 further includes a separation member 40, which is used to form an electrically isolated chamber and an exhaust chamber in the internal space of the housing 110. The electrical chamber is used to accommodate at least one battery cell 20, and the exhaust chamber is used to receive the exhaust from the at least one battery cell 20 and form at least a part of the exhaust passage. The hollow cross member 104 is located in the electrical chamber and connected to the separation member 40. An exhaust port 115 is provided at the connection portion between the hollow cross member 104 and the separation member 40, and the exhaust port 115 is used to receive the exhaust from the exhaust chamber.

[0287] Alternatively, in the embodiment of the present application, the separation member 40 may be the same as the separation member 40 in the embodiments shown in FIGS. 12 to 14 above. By way of example, the separation member 40 includes, but is not limited to, a thermal management member or other types of separation members.

[0288] Alternatively, the separation member 40 may be used as one of the chamber walls in the electrical chamber. The first pressure relief mechanism 213 of at least one battery cell 20 accommodated in the electrical chamber may be provided towards the separation member 40 such that the exhaust of the at least one battery cell 20 is discharged into the exhaust chamber through the separation member 40. Other than the separation member 40, at least some of the other housing walls of the electrical chamber may be hollow housing walls 103, and the second pressure relief mechanism 113 may be provided on the outer surface of the hollow housing wall 103.

[0289] Alternatively, as shown in Fig. 21(a), the isolation member 40 is provided with a pressure relief region 410 corresponding to the first pressure relief mechanism 213 of the battery cell 20. The pressure relief region 410 may be a fragile region, and its strength may be smaller than that of other regions of the isolation member 40 other than the pressure relief region 410. Therefore, when the first pressure relief mechanism 213 of the battery cell 20 operates, the discharge can easily enter the exhaust chamber through the first pressure relief mechanism 213 and the pressure relief region 410 corresponding to the first pressure relief mechanism 213.

[0290] Furthermore, in addition to accommodating at least one battery cell 20, the electric chamber may further accommodate the hollow cross member 104. As shown in Fig. 20, the hollow cross member 104 may be connected to the housing wall of the electric chamber. Specifically, the hollow cross member 104 may be connected to the hollow housing wall 103 where the second pressure relief mechanism 113 of the electric chamber is provided, and the internal space of the hollow cross member 104 may communicate with the internal space of the hollow housing wall 103.

[0291] As shown in Fig. 21(b), in addition to being connected to the hollow housing wall 103, the hollow cross member 104 may be further connected to the isolation member 40, and an exhaust port 115 may be provided at the connection between the hollow cross member 104 and the isolation member 40. Specifically, exhaust ports 115 corresponding to each other are provided in the hollow cross member 104 and the isolation member 40, and the exhaust ports 115 may communicate with the internal space of the hollow cross member 104 and the exhaust chamber. Thereby, the discharge discharged from the battery cell 20 to the exhaust chamber enters the internal space of the hollow cross member 104 through the exhaust ports 115, and further reaches the second pressure relief mechanism 113 through the internal space of the hollow housing wall 103 communicating with the internal space of the hollow cross member 104, and thereby can be discharged to the outside of the housing 110.

[0292] In this embodiment, the exhaust passage inside the housing 110 may include an exhaust chamber, the internal space of the hollow cross member 104, and the internal space of the hollow housing wall 103, and the length of the exhaust passage and the discharge path of the discharge in the exhaust passage may be related to the dimensions of these spaces.

[0293] According to the technical solution of the embodiment of the present application, since the housing 110 is partitioned into an electric chamber and an exhaust chamber that are isolated from each other by the isolation member 40, the discharge of the battery cell 20 in the electric chamber is discharged into the exhaust chamber through the isolation member 40, without affecting the electrical configuration of the battery cell 20 in the electric chamber, and the safety performance of the battery 10 can be improved. Further, by further using the internal spaces of the hollow cross member 104 and the hollow housing wall 103 in the electric chamber as the exhaust passage of the discharge, the discharge path inside the housing 110 of the discharge can be further extended, and the safety performance of the battery 10 can be improved.

[0294] Based on the embodiments shown in FIGS. 20 to 21 described above, FIG. 22 shows another schematic exploded view of the battery 10 according to one embodiment of the present application. FIG. 23 shows a schematic bottom view of the battery 10 shown in FIG. 22.

[0295] As shown in FIGS. 22 and 23, based on the battery 10 shown in FIGS. 20 and 21, the battery 10 further includes an enclosure mechanism 30 provided in the exhaust chamber, and a pressure relief region 410 corresponding to the first pressure relief mechanism 213 of at least one battery cell 20 is formed in the isolation member 40. The discharge of the at least one battery cell 20 is discharged into the exhaust chamber through the pressure relief region 410. The enclosure mechanism 30 is used to surround and form a first exhaust space 310 corresponding to the pressure relief region 410 in the exhaust chamber, and an opening 301 communicating with the first exhaust space 310 is provided in the enclosure mechanism 30. The first exhaust space 310 is used to form at least a part of the exhaust passage.

[0296] Optionally, in the embodiments of the present application, the surrounding mechanism 30 may be the surrounding mechanism 30 in the embodiments shown in FIGS. 12 to 14 above. The surrounding mechanism 30 is provided in the exhaust chamber and can play a role in guiding the path of the exhaust discharged into the exhaust chamber, thereby further extending the exhaust path inside the housing 110 of the exhaust and improving the safety performance of the battery 10.

[0297] As an example, the surrounding mechanism 30 shown in FIG. 23 may be the surrounding mechanism 30 shown in FIG. 14(b), or in other examples, the surrounding mechanism 30 shown in FIG. 23 may be the surrounding mechanism 30 shown in FIG. 14(a) or FIG. 13. The embodiments of the present application do not limit the specific structure of the surrounding mechanism 30.

[0298] Optionally, in the embodiments of the above-mentioned application, second filtration holes for filtering solid particles in the exhaust are provided on the inner surface of the hollow housing wall 103 and / or the hollow cross member 104.

[0299] Specifically, in the embodiments of the present application, the second filtration holes provided on the inner surface of the hollow housing wall 103 and / or the hollow cross member 104 are mainly used to pass the gas in the exhaust, and solid particles with a relatively large particle size in the exhaust can be filtered by the second filtration holes. Since the solid particles cannot be discharged to the second pressure relief mechanism 113 through the second filtration holes, according to this technical solution, the high-temperature solid particles discharged to the second pressure relief mechanism 113 can be reduced, and the safety of the battery 10 can be further improved.

[0300] Optionally, for the design of the diameter of the second filtration holes, reference may be made to the related technical solutions of the first filtration holes 302 described above. That is, the diameter D' of the second filtration holes and the volume energy density E of the battery cell satisfy the relationship of 0.0001 mm / (Wh / L) ≤ D' / E ≤ 0.006 mm / (Wh / L), the unit of D' is mm, and the unit of E is Wh / L.

[0301] Optionally, in the embodiments of the above-mentioned application, at least one of a filtering member, a gas absorption member, and a cooling member is provided in the exhaust passage of the exhaust gas between the first pressure relief mechanism 213 and the second pressure relief mechanism 113.

[0302] Specifically, the filtering member can be used to filter solid particles in the exhaust gas. The gas absorption member can be used to absorb combustible gas in the exhaust gas. The cooling member can be used to absorb the heat of the exhaust gas and reduce the temperature of the exhaust gas.

[0303] By providing at least one of a filtering member, a gas absorption member, and a cooling member in the exhaust passage, the harm of the exhaust gas discharged to the outside of the housing 110 can be further reduced, and the safety performance of the battery 10 can be improved.

[0304] Optionally, the above-mentioned filtering member may include a third filtering hole or a bent air flow passage, and the third filtering hole or the bent air flow passage is used to filter solid particles in the exhaust gas.

[0305] Specifically, the related design of the third filtering hole may be the same as the design of the first filtering hole 302 described above. Optionally, for the design of the diameter of the third filtering hole, the related technical solution of the first filtering hole 302 described above may be referred to. That is, the diameter D’’ of the third filtering hole and the volume energy density E of the battery cell satisfy the relationship of 0.0001 mm / (Wh / L) ≤ D’’ / E ≤ 0.006 mm / (Wh / L), the unit of D’’ is mm, and the unit of E is Wh / L.

[0306] In addition, when the exhaust gas passes through the bent air flow passage, the solid particles in the exhaust gas are relatively likely to remain in the air flow passage, thereby playing a role in filtering. In addition, the air flow passage can further exert a spoiler effect to prevent damage to the housing 110 caused by the direct impact of the air flow in the exhaust gas.

[0307] Optionally, the gas absorption member described above is formed of a gas absorption material, and the gas absorption material is used to absorb combustible gas in the exhaust.

[0308] Optionally, the gas absorption material may be a solid material or a liquid material. For example, the gas absorption material may be a material having a pore structure, such as activated carbon. Also, for example, the gas absorption material may be a solvent capable of absorbing combustible gas, a solvent package may be formed on an outer covering cover of the solvent, and the solvent package may be provided as a gas absorption member in an exhaust path between the first pressure relief mechanism 213 and the second pressure relief mechanism 113.

[0309] In some embodiments, the gas absorption member and the filtration member described above may be two separate individual members. Or, in some other embodiments, the gas absorption member may be interconnected to the filtration member described above. For example, the gas absorption member may be applied to the filtration member in the form of a coating layer.

[0310] Optionally, the cooling member described above is formed of an endothermic material, and the endothermic material is used to absorb the heat quantity of the exhaust and cool the exhaust. As a non-limiting example, the endothermic material may be a metal material, such as aluminum, copper, steel, etc. Or, the endothermic material may be a phase change material, such as a coolant.

[0311] In some embodiments, the cooling member and the filtration member described above may be two separate individual members. Or, in some other embodiments, the cooling member may be integrally integrated with the filtration member described above. For example, a second filtration hole or a bent air flow path is formed in the endothermic material, and the member is both a cooling member and a filtration member.

[0312] Optionally, in the embodiments of the above application, the maximum temperature T1 in the first pressure relief mechanism 213 of the exhaust and the maximum temperature T2 in the second pressure relief mechanism 113 of the exhaust satisfy the relationship of T1 - T2 ≧ 300 °C.

[0313] According to the technical solution of this embodiment, the emissions of the battery cell 20 discharged through the first pressure relief mechanism 213 pass through a relatively long discharge path inside the housing 110, and then the maximum temperature when reaching the second pressure relief mechanism 113 is significantly lower than the temperature in the first pressure relief mechanism 213, thereby preventing the emissions from causing safety risks when discharged outside the battery 10.

[0314] Optionally, in the embodiments of the above application, the maximum temperature T2 of the emissions in the second pressure relief mechanism 113 is ≤ 300 °C.

[0315] According to the technical solution of this embodiment, the emissions of the battery cell 20 discharged through the first pressure relief mechanism 213 pass through a relatively long discharge path inside the housing 110, and then the maximum temperature when reaching the second pressure relief mechanism 113 is relatively low, thereby more reliably preventing the emissions from causing safety risks when discharged outside the battery 10 and ensuring the safety performance of the battery 10. One embodiment of the present application further provides a power consumption device, which may include the battery 10 in each of the above embodiments, and the battery 10 is used to provide power for the power consumption device. Optionally, the power consumption device may be a vehicle 1, a ship or an aircraft.

[0316] The present application has been described with reference to preferred embodiments, but various improvements may be made and members thereof may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural contradiction, the technical features of each item mentioned in each embodiment may be combined in any manner. The present application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions falling within the scope of the claims.

Claims

1. At least one battery cell (20) having a first pressure relief mechanism (213); A housing (110) used to accommodate the at least one battery cell (20) and having a second pressure relief mechanism (113), An exhaust passage is formed between the first pressure relief mechanism (213) of the at least one battery cell (20) and the second pressure relief mechanism (113) of the housing (110). When the first pressure relief mechanism (213) operates, the exhaust passage is used to discharge the exhaust of the at least one battery cell (20) to the second pressure relief mechanism (113) through the first pressure relief mechanism (213), and the minimum length of the exhaust path of the exhaust in the exhaust passage is 0.1 m to 10 m. A battery (10) characterized by this.

2. The battery (10) according to claim 1, wherein the minimum length of the exhaust path is 0.3 m to 5 m.

3. The battery (10) according to claim 1 or 2, wherein the minimum length of the exhaust path is greater than the shortest distance between the first pressure relief mechanism (213) and the second pressure relief mechanism (113).

4. The minimum length B of the exhaust path and the volumetric energy density E of the battery cell (20) satisfy the relationship of 0.0001 m / (Wh / L) ≤ B / E ≤ 0.01 m / (Wh / L), the unit of B is m, and the unit of E is Wh / L. The battery (10) according to any one of claims 1 to 3, characterized by this.

5. The battery (10) according to claim 4, wherein the minimum length B of the exhaust path and the volumetric energy density E of the battery cell (20) satisfy the relationship of 0.0002 m / (Wh / L) ≤ B / E ≤ 0.005 m / (Wh / L).

6. The minimum length B of the exhaust path, the shortest distance A between the first pressure relief mechanism (213) and the second pressure relief mechanism (113), and the volumetric energy density E of the battery cell (20) satisfy the relationship of 0.0015 L / Wh ≤ (B / A) / E ≤ 0.08 L / Wh, the units of A and B are m, and the unit of E is Wh / L. The battery (10) according to any one of claims 1 to 5, characterized by this.

7. The minimum length B of the discharge path, the shortest distance A between the first pressure relief mechanism (213) and the second pressure relief mechanism (113), and the volume energy density E of the battery cell (20) satisfy the relationship 0.003 L / W·h ≤ (B / A) / E ≤ 0.04 L / W·h. The battery (10) according to claim 6 is characterized by this.

8. The battery (10) further includes an enclosure mechanism (30) for surrounding and forming a first exhaust space (310) corresponding to the first pressure relief mechanism (213) of the at least one battery cell (20). An opening (301) communicating with the first exhaust space (310) is provided in the enclosure mechanism (30). The first exhaust space (310) is used to form at least a part of the exhaust passage. The battery (10) according to any one of claims 1 to 7 is characterized by this.

9. The opening (301) is located at a position away from the second pressure relief mechanism (113) in the enclosure mechanism (30). The battery (10) according to claim 8 is characterized by this.

10. The opening (301) faces another housing wall of the housing (110) other than the housing wall where the second pressure relief mechanism (113) is located. The battery (10) according to claim 8 or 9 is characterized by this.

11. The opening (301) is located in the central region of the housing (110). The battery (10) according to any one of claims 8 to 10 is characterized by this.

12. The number of the enclosure mechanisms (30) is plural, and the plural enclosure mechanisms (30) are provided at intervals. The battery (10) according to any one of claims 8 to 11 is characterized by this.

13. The openings (301) of two adjacent enclosure mechanisms (30) among the plural enclosure mechanisms (30) are provided on two adjacent walls of the two adjacent enclosure mechanisms (30), and the openings (301) of the two adjacent enclosure mechanisms (30) are provided offset from each other. The battery (10) according to claim 12 is characterized by this.

14. The first pressure relief mechanism (213) is provided on the first wall (201) of the at least one battery cell (20), the first wall (201) of the at least one battery cell (20) is provided opposite to the first housing wall (101) of the housing (110), and the surrounding mechanism (30) is provided between the first housing wall (101) and the first wall (201) of the at least one battery cell (20). The battery (10) according to any one of claims 8 to 13, characterized in that.

15. The surrounding mechanism (30) is attached to the first housing wall (101) and the first wall (201) of the at least one battery cell (20), and the second pressure relief mechanism (113) is provided on another housing wall of the housing (110) other than the first housing wall (101). The battery (10) according to claim 14, characterized in that.

16. The second housing wall (102) of the housing (110) intersects the first housing wall (101) of the housing (110), and the second pressure relief mechanism (113) is provided on the second housing wall (102). A second exhaust space (320) is formed between the surrounding mechanism (30) and the second housing wall (102), the second exhaust space (320) communicates with the first exhaust space (310) through the opening (301), and the discharge product enters the second exhaust space (320) through the opening (301) and is discharged to the second pressure relief mechanism (113). The battery (10) according to claim 15, characterized in that.

17. The at least one battery cell (20) is arranged to form a battery cell assembly, and two electrode terminals (214) are provided on the first wall (201) of each battery cell (20) in the battery cell assembly. The first pressure relief mechanism (213) is provided between the two electrode terminals (214), and the surrounding mechanism (30) is provided between the two electrode terminals (214) of each battery cell (20) in the battery cell assembly. The battery (10) according to any one of claims 14 to 16, characterized in that.

18. An isolation member (40) is provided between the first housing wall (101) and the first wall (201) of the at least one battery cell (20), and the isolation member (40) is used to form an electrically isolated electrical chamber and an exhaust chamber inside the housing (110). The electric chamber is used to accommodate the at least one battery cell (20), emissions of the at least one battery cell (20) are discharged into the exhaust chamber through the isolation member (40), the surrounding mechanism (30) is provided in the exhaust chamber, and the surrounding mechanism (30) is attached to the isolation member (40) and the first housing wall (101), and the surrounding mechanism (30) is used to form by surrounding a first exhaust space (310) corresponding to the first pressure relief mechanism (213) of the at least one battery cell (20) in the exhaust chamber. The battery (10) according to claim 14, characterized in that.

19. The battery (10) according to claim 18, characterized in that the second pressure relief mechanism (113) is provided on a housing wall of the housing (110) corresponding to the exhaust chamber.

20. The battery (10) according to claim 18 or 19, characterized in that the second pressure relief mechanism (113) is provided on a housing wall of the housing (110) other than the first housing wall (101).

21. A pressure relief region (410) corresponding to the first pressure relief mechanism (213) of the at least one battery cell (20) is formed in the isolation member (40), emissions of the at least one battery cell (20) are discharged into the exhaust chamber through the pressure relief region (410), and the surrounding mechanism (30) is used to form by surrounding a first exhaust space (310) corresponding to the pressure relief region (410) in the exhaust chamber. The battery (10) according to any one of claims 18 to 20, characterized in that.

22. The battery (10) according to any one of claims 18 to 21, characterized in that the isolation member (40) is a heat management member for adjusting the temperature of the battery cell (20).

23. The battery (10) according to any one of claims 8 to 22, characterized in that a first filtration hole (302) for filtering solid particles in the emissions is formed in the surrounding mechanism (30).

24. The battery (10) according to claim 23, characterized in that the surrounding mechanism (30) has an intermittent configuration, the surrounding mechanism (30) is formed of a plurality of surrounding portions, and a gap between two adjacent surrounding portions among the plurality of surrounding portions forms the first filtration hole (302).

25. The diameter D of the first filtration hole (302) and the volume energy density E of the battery cell (20) satisfy a relationship of 0.0001 mm / (Wh / L) ≤ D / E ≤ 0.006 mm / (Wh / L), where the unit of D is mm and the unit of E is Wh / L, and the battery (10) according to claim 23 or 24 is characterized thereby. **Claim 26** The melting point of the material of the surrounding mechanism (30) is 200°C or higher, and the battery (10) according to any one of claims 8 to 25 is characterized thereby. **Claim 27** At least one housing wall of the housing (110) is a hollow housing wall (103), a second pressure relief mechanism (113) is provided on the outer surface of the hollow housing wall (103), an exhaust port (115) is provided on the inner surface of the hollow housing wall (103), and at least a part of the exhaust passage is formed in the internal space between the inner surface and the outer surface of the hollow housing wall (103), and the battery (10) according to any one of claims 1 to 7 is characterized thereby. **Claim 28** At least two housing walls of the housing (110) are hollow housing walls (103), the exhaust port (115) and the second pressure relief mechanism (113) are provided on different hollow housing walls (103), or the exhaust port (115) and the second pressure relief mechanism (113) are provided on the same hollow housing wall (103), and the exhaust port (115) and the second pressure relief mechanism (113) are provided offset from each other, and the battery (10) according to claim 27 is characterized thereby. **Claim 29** At least one housing wall of the housing (110) is a hollow housing wall (103), a second pressure relief mechanism (113) is provided on the outer surface of the hollow housing wall (103), the battery (10) further includes a hollow cross member (104), an exhaust port (115) is provided on the inner surface of the hollow cross member (104) and / or the hollow housing wall (103), the internal space of the hollow cross member (104) communicates with the internal space of the hollow housing wall (103), and at least a part of the exhaust passage is formed in the internal space of the hollow cross member (104) and the internal space of the hollow housing wall (103), and the battery (10) according to any one of claims 1 to 7 is characterized thereby. **Claim 30** When the number of the at least one battery cell (20) is plural, the plural battery cells (20) include plural sets of battery cells (20), and the hollow cross member (104) is used to partition the internal space of the housing (110) into plural sub-spaces, and the plural sub-spaces are respectively used to accommodate the plural sets of battery cells (20). The hollow cross member (104) is provided with the exhaust port (115) corresponding to each of the plural sub-spaces among the plural sub-spaces, and / or The inner surface of the hollow housing wall (103) is provided with the exhaust port (115) corresponding to each of the plural sub-spaces among the plural sub-spaces. The battery (10) according to claim 29, characterized in that.

31. The battery (10) further includes a partition member (40), and the partition member (40) is used to form an electrically isolated chamber and an exhaust chamber that are mutually isolated in the internal space of the housing (110). The electrical chamber is used to accommodate the at least one battery cell (20), and the exhaust chamber is used to receive the discharge from the at least one battery cell (20) and form at least a part of the exhaust passage. The hollow cross member (104) is located in the electrical chamber and connected to the partition member (40). The exhaust port (115) is provided at the connection portion between the hollow cross member (104) and the partition member (40), and the exhaust port (115) is used to receive the discharge from the exhaust chamber. The battery (10) according to claim 29, characterized in that.

32. The battery (10) further includes an enclosure mechanism (30) provided in the exhaust chamber. A pressure relief region (410) corresponding to the first pressure relief mechanism (213) of the at least one battery cell (20) is formed in the partition member (40). The discharge of the at least one battery cell (20) is discharged into the exhaust chamber through the pressure relief region (410). The enclosure mechanism (30) is used to surround and form a first exhaust space (310) corresponding to the pressure relief region (410) in the exhaust chamber, and an opening (301) communicating with the first exhaust space (310) is provided in the enclosure mechanism (30). The first exhaust space (310) is used to form at least a part of the exhaust passage. The battery (10) according to claim 31, characterized in that.

33. The battery (10) according to any one of claims 27 to 32, wherein a second filtration hole for filtering solid particles in the discharge is provided on the inner surface of the hollow basket wall (103) and / or the hollow cross member (104).

34. The battery (10) according to any one of claims 1 to 33, wherein at least one of a filtration member, a gas absorption member, and a cooling member is provided in the exhaust passage.

35. The battery (10) according to claim 34, wherein the filtration member includes a third filtration hole or a bent air flow path, and the third filtration hole or the bent air flow path is used for filtering solid particles in the discharge.

36. The battery (10) according to claim 34 or 35, wherein the gas absorption member is formed of a gas absorption material for absorbing combustible gas in the discharge.

37. The battery (10) according to any one of claims 34 to 36, wherein the cooling member is formed of an endothermic material for absorbing the heat quantity of the discharge and cooling the discharge.

38. The battery (10) according to any one of claims 1 to 37, wherein the maximum temperature T1 in the first pressure relief mechanism (213) of the discharge and the maximum temperature T2 in the second pressure relief mechanism (113) of the discharge satisfy the relationship T1 - T2 ≧ 300°C.

39. The battery (10) according to claim 38, wherein the maximum temperature T2 in the second pressure relief mechanism (113) of the discharge is ≦ 300°C.

40. A power consumption device including the battery (10) according to any one of claims 1 to 39, wherein the battery (10) is used to provide power.

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