Battery cell, battery device, energy storage device, energy storage system, and charging network

Abstract

This invention relates to the field of battery technology, and provides a battery cell, a battery device, an energy storage device, an energy storage system, and a charging network. The battery cell includes: a casing, comprising a housing and a first wall, the first wall being connected to one end of the housing along a first direction, and the first wall having electrode terminals and / or a pressure relief mechanism; an electrode assembly housed within the housing; and an insulating member, including: a main body portion disposed between the first wall and the electrode assembly, the main body portion having spaced-apart first protrusions along a second direction, the first protrusions having first venting channels extending through the first protrusions along the second direction; and a side wall portion disposed between the housing and the electrode assembly, the side wall portion being connected to at least one end of the main body portion along the second direction and extending along the first direction. The side wall portion has a second protrusion configured to abut against the electrode assembly. This configuration reduces the risk of housing rupture due to poor venting and improves the safety and reliability of pressure relief.

Description

Technical Field

[0001] This specification relates to the field of battery technology, and in particular to a battery cell, battery device, energy storage device, energy storage system, and charging network. Background Technology

[0002] As energy storage cells continue to develop towards larger capacity and higher energy density, the risk of thermal runaway in batteries increases significantly. In the event of thermal runaway, traditional batteries cannot smoothly expel internal gases, leading to the risk of pressure leakage and battery failure.

[0003] Therefore, there is an urgent need to propose a battery cell, battery device, energy storage device, energy storage system, and charging network to solve the above-mentioned technical problems. Summary of the Invention

[0004] This specification provides one or more embodiments of a battery cell, including a casing, an electrode assembly, and an insulating component. The casing includes a housing and a first wall, the first wall being connected to one end of the housing along a first direction and having electrode terminals and / or a pressure relief mechanism. The electrode assembly is housed within the housing. The insulating component includes a main body and a side wall. The main body is disposed between the first wall and the electrode assembly, and the main body has spaced-apart first protrusions along a second direction, each first protrusion having a first venting channel extending through it along the second direction. The side wall is disposed between the housing and the electrode assembly, connected to at least one end of the main body along the second direction, and extending along the first direction. The main body has spaced-apart first protrusions, each first protrusion having multiple first venting channels, which facilitate the discharge of high-temperature gas in a direction parallel to the plane of the first wall. The side wall has a second protrusion configured to abut against the electrode assembly. The main body and side wall, configured as described above, allow sufficient venting clearance between the electrode assembly and the housing, reducing the risk of housing rupture due to poor venting, thereby improving the safety and reliability of pressure relief.

[0005] The second protrusion on the side wall abuts against the electrode assembly, reducing the risk of poor exhaust caused by the contact between the electrode assembly and the housing.

[0006] In some embodiments, a second exhaust channel is provided on the second boss, and the second exhaust channel extends through the second boss along a first direction. The second exhaust channel on the second boss can effectively reduce the risk of the exhaust path between the housing and the electrode assembly being blocked due to contact between the electrode assembly and the housing. The combination of the side wall portion, the second boss, and the second exhaust channel can reduce the risk of housing rupture caused by poor exhaust when thermal runaway occurs in the electrode assembly, thereby improving the safety and reliability of pressure relief.

[0007] In some embodiments, the sidewall portion is provided with at least two second protrusions, adjacent second protrusions being spaced apart along a first direction and forming a second exhaust channel. By providing at least two second protrusions spaced apart along the first direction, each second protrusion abutting against the electrode assembly, the electrode assembly can be stabilized, reducing the risk of electrode assembly shaking. Simultaneously, the second exhaust channel can effectively reduce the risk of the exhaust path between the housing and the electrode assembly being blocked due to contact between the electrode assembly and the housing.

[0008] In some embodiments, the second boss protrudes toward the electrode assembly relative to the sidewall portion. The second boss protruding toward the electrode assembly relative to the sidewall portion can occupy the space between the electrode assembly and the housing in the second direction, thereby forming a support on the side of the electrode assembly facing the housing, separating the electrode assembly from the housing, and preventing the exhaust passage from being blocked due to the electrode assembly being attached to the inner wall of the housing.

[0009] In some embodiments, the housing further includes a second wall connected to the end of the housing away from the first wall along a first direction, and the distance between the second boss and the first wall is smaller than the distance between the second boss and the second wall. By positioning the second boss on the insulating member near the first wall closer to the first wall, the support effect of the second boss on the electrode assembly on the first wall side can be improved.

[0010] In some embodiments, the distance between the second boss and the end of the sidewall portion away from the main body is greater than the distance between the second boss and the end of the sidewall portion closer to the main body. By positioning the second boss closer to the connection end, the support effect of the second boss on the end of the electrode assembly can be improved. In other embodiments, the distance between the second boss and the end of the sidewall portion away from the main body is smaller than the distance between the second boss and the end of the sidewall portion closer to the main body. By positioning the second boss closer to the free end, sufficient venting clearance can be ensured between the second boss and the main body, reducing the risk of housing rupture caused by poor venting, thereby improving the safety and reliability of pressure relief.

[0011] In some embodiments, there are two sidewalls, each connected to one end of the main body in the second direction. The two sidewalls, distributed at both ends of the main body in the second direction, provide exhaust paths between the electrode assembly and the housings on both sides along the second direction. This results in higher exhaust efficiency and improved pressure relief reliability when the electrode assembly experiences thermal runaway.

[0012] In some embodiments, the first wall is provided with a pressure relief mechanism, and the insulating member is provided with an opening for the pressure relief mechanism. Along the second direction, first bosses are respectively provided on both sides of the opening for the pressure relief mechanism. The first bosses located on both sides of the opening for the pressure relief mechanism provide channels for exhaust from the pressure relief mechanism in two directions, improving exhaust efficiency and the reliability of pressure relief.

[0013] In some embodiments, the first wall is provided with electrode terminals, the insulating member is provided with electrode terminal openings, and a first boss is provided between the electrode terminal openings and the pressure relief mechanism opening. The first boss is located between the two electrode terminal openings, providing an exhaust channel between the two electrode terminals, thereby improving exhaust efficiency and pressure relief reliability.

[0014] In some embodiments, the first wall is provided with two electrode terminals, and the insulating member is provided with two electrode terminal openings, with a first boss provided between the two electrode terminal openings. The first boss located on both sides of the pressure relief mechanism opening also serves as the first boss between the pressure relief mechanism opening and the electrode terminal opening, providing an exhaust channel for the pressure relief mechanism and the electrode terminal side, thereby improving exhaust efficiency and pressure relief reliability.

[0015] In some embodiments, the housing further includes a second wall connected to one end of the housing away from the first wall along a first direction, the first wall being provided with a pressure relief mechanism, and the second wall being provided with electrode terminals.

[0016] In some embodiments, the size of the casing in the second direction is smaller than that in the first direction. In a short-blade shaped cell, the electrode assembly is prone to drooping and sticking tightly to the casing under the influence of gravity, crowding out the venting channel on that side. This can lead to poor venting and localized overheating during thermal runaway. The high-temperature gas may cause the electrode assembly to melt and form molten beads, melting through the casing and further triggering non-directional pressure relief, threatening the overall safety of the battery.

[0017] In some embodiments, an insulating element is provided between the second wall and the electrode assembly.

[0018] In some embodiments, the insulating element near the second wall is spaced apart from the insulating element near the first wall. The spaced-apart insulating elements facilitate the assembly of the entire battery cell.

[0019] In some embodiments, the sidewall portion of the insulating member near the first wall is located on one side of the electrode assembly in the second direction, and the sidewall portion of the insulating member near the second wall is located on the other side of the electrode assembly in the second direction. Thus, both insulating members can be L-shaped, and the two L-shaped insulating members 10 are symmetrically arranged to ensure that the electrode assembly is supported on both sides along the second direction, while sufficient exhaust gaps are provided on both sides to improve exhaust efficiency.

[0020] In some embodiments, the electrode assembly includes a plurality of electrodes stacked together.

[0021] In some embodiments, the length of the sidewall portion along the first direction is greater than 20% and less than 50% of the length of the electrode assembly in the first direction. By limiting the length of the sidewall portion, on the one hand, the second boss can provide sufficient support for the electrode assembly to prevent the electrode assembly from sinking; on the other hand, it can avoid material waste and cost increase caused by excessive extension of the sidewall portion, thereby achieving a balance between support function and cost control.

[0022] In some embodiments, the width of the first boss in the second direction is greater than 10% and less than 20% of the length of the first wall in the second direction; the length of the first boss in the third direction is greater than 90% and less than the length of the main body in the third direction. By limiting the dimensions of the first boss in the second and third directions, while ensuring sufficient bearing area and structural strength for the electrode assembly, the risk of material waste and encroachment on exhaust space due to excessive width is reduced, achieving a balance between protective capability and space utilization.

[0023] In some embodiments, the width of the second boss in the first direction is greater than 10% and less than 20% of the height of the electrode assembly in the first direction; the length of the second boss in the third direction is greater than 90% and less than the length of the sidewall portion in the third direction. By limiting the dimensions of the second boss in the second and third directions, the second boss has sufficient support area in the height direction of the housing, effectively preventing the electrode assembly from sagging and blocking the exhaust channel, while avoiding the second boss being too large and affecting the welding space between the electrode assembly and the adapter piece.

[0024] In some embodiments, the number of first protrusions is at least two, and the spacing between adjacent first protrusions along the second direction is greater than 20% and less than 60% of the length of the electrode assembly in the second direction. By limiting the number of first protrusions, the exhaust efficiency of high-temperature gas can be improved. By limiting the distance between adjacent first protrusions, it is possible to avoid the first protrusions being too close, causing the high-temperature gas flow to directly impact the first protrusions and resulting in thermal failure, and also to prevent the first protrusions from being too far apart, thus failing to effectively suppress the displacement of the electrode plate below the opening of the pressure relief mechanism, allowing the gas to be discharged smoothly.

[0025] In some embodiments, the first exhaust passage and / or the second exhaust passage includes multiple through holes. By providing multiple through holes in the first exhaust passage and / or the second exhaust passage, the directional discharge capability and pressure relief efficiency of high-temperature gas can be improved, while the first boss and the second boss can have a certain structural strength.

[0026] In some embodiments, the area of ​​each through-hole is 10 mm². 2 -200mm2 Within the specified range. While ensuring the structural strength of the boss is not significantly weakened, each through-hole should have sufficient gas passage capacity to avoid poor venting due to an excessively small through-hole area or failure of the boss structure due to an excessively large through-hole area.

[0027] This specification provides a battery device according to one or more embodiments, including a plurality of battery cells as described in any of the above embodiments.

[0028] This specification provides an energy storage device according to one or more embodiments, including a plurality of battery cells or battery devices as described in any of the above embodiments, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0029] This specification provides an energy storage system according to one or more embodiments, including an energy conversion system and an energy storage device as described in any of the above embodiments. The energy conversion system is connected to the energy storage device to convert energy from current input to the energy storage device or output from the energy storage device.

[0030] This specification provides one or more embodiments of a charging network, including charging piles and an energy storage device or system as described in any of the above embodiments. The energy storage device is used to provide electrical energy to the charging piles. Attached Figure Description

[0031] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0032] Figure 1 This is a top view of the pressure relief mechanism side of a battery cell according to some embodiments of this specification; Figure 2 This is a top view of the electrode terminal side of a battery cell according to some embodiments of this specification; Figure 3 yes Figure 1 and Figure 2 The diagram shows the internal structure of a single battery cell in section AA. Figure 4 yes Figure 3 The diagram shows the structure of the insulating components and electrode assembly of the battery cell. Figure 5 yes Figure 4 The diagram shows the structure of the insulating component of the battery cell on the pressure relief mechanism side; Figure 6 yes Figure 4 The diagram shows the structure of the insulating component on the electrode terminal side of the battery cell. Figure 7This is a top view of the pressure relief mechanism and electrode terminal side of a battery cell according to other embodiments of this specification; Figure 8 yes Figure 7 The diagram shows the internal structure of a single battery cell in the BB section. Figure 9 yes Figure 7 The diagram shows the structure of the insulating components on the pressure relief mechanism and electrode terminal side of the battery cell. Figure 10 Schematic diagrams of insulating components shown in some embodiments of this specification; Figure 11 yes Figure 10 The diagram shows the structure of the insulating component in a single battery cell.

[0033] Reference numerals: 1A, first type of battery cell; 1B, second type of battery cell; 10, insulating component; 11, main body; 111, first boss; 1111, first exhaust channel; 112, electrode terminal opening; 113, pressure relief mechanism opening; 12, side wall; 121, second boss; 1211, second exhaust channel; 13, through hole; 20, first wall; 22, second wall; 24, outer shell; 30, electrode assembly; 40, housing; 51, electrode terminal; 52, pressure relief mechanism; first direction, X; second direction, Y; third direction, Z. Detailed Implementation

[0034] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, "multiple groups" means two or more, and "each" means each of the multiple, unless otherwise explicitly defined.

[0036] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the conveying device, are merely illustrative and should not constitute any limitation on this application.

[0040] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0041] As energy storage cells continue to develop towards larger capacity and higher energy density, the risk of thermal runaway in batteries has increased significantly. However, due to unreasonable design of the structure, number, shape, and structure of the insulating components, thermal runaway problems such as airflow blockage, poor venting, and even non-directional pressure relief still exist in practical applications, seriously affecting the safety and reliability of the cells during operation. To solve the above problems, some embodiments of this application provide a battery cell, including a casing, an electrode assembly, and an insulating component. The casing includes a housing and a first wall. The first wall is connected to one end of the housing along a first direction and is provided with electrode terminals and / or a pressure relief mechanism. The electrode assembly is housed within the housing. The insulating component includes a main body and a side wall. The main body is disposed between the first wall and the electrode assembly. The main body is provided with spaced-apart first protrusions along a second direction, and a first venting channel is provided on the first protrusion, which extends through the first protrusion along the second direction. The side wall is disposed between the housing and the electrode assembly, and is provided at least one end of the main body along the second direction and extends along the first direction. The first exhaust channel on the first protrusion of the main body facilitates the discharge of gas along the direction of the first wall plane. The configuration on the side wall provides an exhaust path between the electrode assembly and the housing. When the electrode assembly experiences thermal runaway, the violent exhaust process does not cause blockage or housing rupture, thus improving the reliability of pressure relief.

[0042] In this embodiment, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to these types.

[0043] In this embodiment, "tab" refers to a conductive tab extending from the positive and negative electrode plates of the electrode assembly, forming an electrical connection between the electrode assembly and the electrode terminals. "Electrode terminals" refer to the leads of the positive and negative electrodes, connected to an external circuit. "Pressure relief mechanism" refers to a pressure relief device on the battery. When the internal pressure of the battery rises sharply due to thermal runaway or other reasons, the pressure relief mechanism actively opens or ruptures after reaching a set pressure threshold, directionally releasing the high-pressure gas and preventing the battery casing from exploding. In some embodiments, the pressure relief mechanism can be an explosion-proof valve.

[0044] Some embodiments of this specification provide a single battery cell.

[0045] Figures 1-6 This is a schematic diagram of the structure of a first type of battery cell according to some embodiments of this application. Figure 1 This is a top view of the pressure relief mechanism side of a battery cell according to some embodiments of this specification; Figure 2This is a top view of the electrode terminal side of a battery cell according to some embodiments of this specification; Figure 3 yes Figure 1 and Figure 2 The diagram shows the internal structure of a single battery cell in section AA. Figure 4 yes Figure 3 The diagram shows the structure of the insulating components and electrode assembly of the battery cell. Figure 5 yes Figure 4 The diagram shows the structure of the insulating component of the battery cell on the pressure relief mechanism side; Figure 6 yes Figure 4 The diagram shows the structure of the insulating component on the electrode terminal side of the battery cell.

[0046] Figures 7-9 This is a structural schematic diagram of a second type of battery cell according to some embodiments of this application, wherein... Figure 7 This is a top view of the pressure relief mechanism and electrode terminal side of a battery cell according to some embodiments of this specification; Figure 8 yes Figure 7 The diagram shows the internal structure of a single battery cell in the BB section. Figure 9 yes Figure 7 The diagram shows the structure of the insulating components on the pressure relief mechanism and electrode terminal side of the battery cell. Figure 10 This is a schematic diagram of the structure of an insulating component according to some embodiments of this specification. Figure 11 yes Figure 10 The diagram shows the structure of the insulating component in a single battery cell.

[0047] In this embodiment, different types of battery cells are classified based on the different end faces of the cell where the electrode terminals and the pressure relief mechanism are located. The first type of battery cell is also called a "short-blade type battery cell," referring to cells where the electrode terminals and the pressure relief mechanism are respectively located on different end faces of the cell (i.e., as shown in the image). Figures 1-4 As shown, the electrode terminals and pressure relief mechanism are respectively located on two opposite sides of the cell. The dimension of the first type of cell along the first direction X (i.e., the distance between the two end faces where the electrode terminals and pressure relief mechanism are respectively located) is greater than the dimension along the second direction Y. "First type of battery cell" refers to a battery cell containing the first type of cell. The second type of cell, also known as a "long-blade type cell," refers to a cell where the electrode terminals and pressure relief mechanism are located on the same end face of the cell (i.e., as shown). Figures 7-9 As shown, this refers to a battery cell where the electrode terminals and the pressure relief mechanism are located on the same side of the cell. "Second-type battery cell" refers to a battery cell containing a second-type battery cell. Specifically, when the electrode terminals and the pressure relief mechanism are located on the same side, the end face containing the electrode terminals and the pressure relief mechanism is called the electrode terminal and pressure relief mechanism side. When the electrode terminals and the pressure relief mechanism are located on opposite sides, the end face containing the electrode terminals is called the electrode terminal side, and the end face containing the pressure relief mechanism is called the pressure relief mechanism side.

[0048] In some embodiments, the battery cell includes a housing, an electrode assembly, and an insulating member. The housing includes a casing and a first wall. The first wall is connected to one end of the casing along a first direction X. The first wall is provided with electrode terminals and / or a pressure relief mechanism. The electrode assembly is housed within the casing. The insulating member includes a main body portion and a side wall portion. The main body portion is disposed between the first wall and the electrode assembly. The main body portion has first protrusions spaced apart along a second direction Y. A first venting channel is provided on the first protrusion. The first venting channel extends through the first protrusion along the second direction Y. The side wall portion is disposed between the casing and the electrode assembly. The side wall portion is connected to at least one end of the main body portion along the second direction Y and extends along the first direction X.

[0049] Combination Figure 3 and Figure 8 The first type of battery cell 1A or the second type of battery cell 1B respectively includes an electrode assembly 30, an insulating component 10, and a housing 24. The housing 24 includes a shell 40 and a first wall 20. The first wall 20 is connected to one end of the shell 40 along a first direction X. The first wall 20 is provided with electrode terminals and / or a pressure relief mechanism. The electrode assembly 30 is housed within the shell 40.

[0050] The first wall 20 refers to an assembly used to seal the battery cell (e.g., the open end of the housing 40). In some embodiments, the first wall 20 is connected to the open end of the housing 40 of the battery cell. For example, as Figure 3 and Figure 8 As shown, the first wall 20 is connected to one end of the housing 40 along the first direction X. In some embodiments, the first wall 20 is provided with functional components, such as electrode terminals, pressure relief mechanisms, etc. Figure 3 As shown, the first type of battery cell 1A includes a first wall 20, and a pressure relief mechanism 52 is provided on the first wall 20 (see...). Figure 1 In some embodiments, such as Figure 3 As shown, the first type of battery cell 1A includes a first wall 20, on which electrode terminals 51 are disposed. It should be understood that when the pressure relief mechanism 52 and the electrode terminals 51 are located on different end faces, both end faces can be referred to as the first wall 20, or one can be referred to as the first wall 20 and the other as the second wall 22. In some embodiments, such as... Figure 8 As shown, the second type of battery cell 1B includes a first wall 20, on which a pressure relief mechanism 52 and an electrode terminal 51 are provided.

[0051] The housing 40 refers to the hollow structural component in the battery cell used to house and protect internal components (such as electrode assembly 30, tabs, etc.). In some embodiments, the first wall 20 can be connected to the housing 40 in various ways (such as welding, bonding, snap-fitting, riveting, etc.) to form the outer shell 24.

[0052] Electrode assembly 30 refers to the structure in a battery cell where an electrochemical reaction occurs to generate electrical energy. In some embodiments, electrode assembly 30 may consist of a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through. For example, electrode assembly 30 includes multiple electrodes stacked together. As an example, multiple positive and multiple negative electrodes may be provided, with multiple positive and multiple negative electrodes stacked alternately.

[0053] The insulating member 10 is an insulating member that isolates the electrode assembly 30 from the housing 24. For example, the insulating member 10 may isolate the electrode assembly 30 from the first wall 20. As another example, the insulating member 10 may isolate the electrode assembly 30 from the housing 40.

[0054] In some embodiments, one or more insulating elements 10 may be provided in the battery cell. For example, such as Figures 3-4 As shown, when the pressure relief mechanism and the electrode terminals are arranged on opposite sides, the insulating member 10 can be arranged on both the pressure relief mechanism side and the electrode terminal side. For example, as... Figure 8 As shown, when the pressure relief mechanism and the electrode terminal are arranged on the same side, the insulating member 10 is arranged on one side only on the side of the pressure relief mechanism and the electrode terminal.

[0055] In some embodiments, combined with Figures 1-9 The insulating member 10 includes a main body portion 11 and a side wall portion. The main body portion is disposed between the first wall 20 and the electrode assembly 30. The side wall portion 12 is disposed between the housing 40 and the electrode assembly 30. The side wall portion 12 is connected to at least one end of the main body portion 11 along the second direction Y and extends along the first direction X. For example, the side wall portion 12 may be connected to only one end of the main body portion 11 along the second direction Y. As another example, the side wall portion 12 may be connected to both ends of the main body portion 11 along the second direction Y.

[0056] In some embodiments, such as Figures 3-6 and Figures 8-10 As shown, the main body 11 is provided with first protrusions 111 spaced apart along the second direction Y. The first protrusions 111 are provided with first exhaust channels 1111, and the first exhaust channels 1111 pass through the first protrusions 111 along the second direction Y.

[0057] In some embodiments, the first wall is provided with a pressure relief mechanism, the insulating member is provided with an opening for the pressure relief mechanism, and a first boss is provided on both sides of the opening for the pressure relief mechanism along the second direction Y. Figure 1 and Figure 5The first wall 20 is provided with a pressure relief mechanism 52, and correspondingly, the insulating member 10 (main body 11) on the side of the first wall 20 is provided with a pressure relief mechanism opening 113. Along the second direction Y, a first boss 111 is provided on both sides of the pressure relief mechanism opening 113.

[0058] The first bosses located on both sides of the opening of the pressure relief mechanism provide channels for exhaust from the pressure relief mechanism in two directions, improving exhaust efficiency and pressure relief reliability.

[0059] In some embodiments, the first wall is provided with two electrode terminals, the insulating member is provided with two electrode terminal openings, and a first boss is provided between the two electrode terminal openings. Figure 2 and Figure 6 The first wall 20 is provided with two electrode terminals 51, and correspondingly, the insulating member 10 (main body 11) on the side of the first wall 20 is provided with two electrode terminal openings 112. A first boss 111 is provided between the two electrode terminal openings 112. The number of first bosses 111 is at least one.

[0060] The first protrusion is located between the openings of the two electrode terminals, providing an exhaust channel between the two electrode terminals, thereby improving exhaust efficiency and the reliability of pressure relief.

[0061] In some embodiments, the first wall is provided with electrode terminals, the insulating member is provided with electrode terminal openings, and a first boss is provided between the electrode terminal opening and the pressure relief mechanism opening. Figure 7 and Figure 9 A pressure relief mechanism 52 and an electrode terminal 51 are provided on the first wall 20. Correspondingly, a pressure relief mechanism opening 113 and an electrode terminal opening 112 are provided on the insulating member 10 (main body 11) on the side of the first wall 20. A first boss 111 is provided between the electrode terminal opening 112 and the pressure relief mechanism opening 113.

[0062] The first boss located on both sides of the pressure relief mechanism opening also serves as the first boss between the pressure relief mechanism opening and the electrode terminal opening. This first boss provides an exhaust channel for the pressure relief mechanism and the electrode terminal side, improving exhaust efficiency and pressure relief reliability.

[0063] In some embodiments, a second protrusion 121 is provided on the sidewall portion 12, and the second protrusion 121 is configured to abut against the electrode assembly 30. The second protrusion provided on the sidewall portion abuts against the electrode assembly to prevent the electrode assembly from sagging or swaying under the action of gravity.

[0064] like Figures 3-6 and Figures 8-10 As shown, the second boss 121 is provided with a second exhaust channel 1211, which passes through the second boss 121 along the first direction X.

[0065] The second exhaust channel located on the second protrusion effectively reduces the risk of the exhaust path between the housing and the electrode assembly being blocked due to electrode assembly sagging. The combination of the side wall, the second protrusion, and the second exhaust channel can reduce the risk of housing rupture caused by poor exhaust in the event of thermal runaway of the electrode assembly, thereby improving the safety and reliability of pressure relief.

[0066] The main body 11 refers to the structure in the insulating member 10 that provides openings for functional components (such as electrode terminals 51 and / or pressure relief mechanisms 52). In some embodiments, the main body 11 has electrode terminal openings 112 and / or pressure relief mechanism openings 113. The electrode terminal opening 112 is used to position and accommodate the electrode terminals 51 of the battery cell, and the pressure relief mechanism opening 113 is used to position and accommodate the pressure relief mechanism 52 of the battery cell. Figure 5 As shown, the main body 11 of the insulating member 10 on the pressure relief mechanism side of the first type of battery cell 1A is provided with a pressure relief mechanism opening 113, such as... Figure 6 As shown, an electrode terminal opening 112 is provided on the main body 11 of the insulating member 10 on the electrode terminal side. (As indicated...) Figure 9 As shown, when the electrode terminal 51 and the pressure relief mechanism 52 are disposed on the same side of the second type of battery cell 1B, the main body 11 of the insulating member 10 of the second type of battery cell 1B is provided with a pressure relief mechanism opening 113 and an electrode terminal opening 112, respectively.

[0067] The sidewall portion 12 refers to the structure in the insulating member 10 that extends along the first direction X. The main body portion 11 has two ends (i.e., two ends, also referred to as the connection ends between the main body portion 11 and the sidewall portion 12) along the second direction Y. The sidewall portion 12 is disposed at at least one end of the main body portion 11 along the second direction Y and extends along the first direction X. In some embodiments, the first direction X is perpendicular to the second direction Y.

[0068] In some embodiments, there are two sidewall portions 12. The two sidewall portions 12 are respectively connected to both ends of the main body portion 11 in the second direction Y. For example... Figures 4-6 and Figures 8-9 As shown, the two sidewall portions 12 together with the main body portion 11 form a "U" shape. The main body portion 11 constitutes a "-" shaped part of the "U" shape, and the two sidewall portions 12 constitute two parallel "|" shaped parts of the "U" shape.

[0069] Two sidewalls are located at both ends of the main body in the second direction Y, providing venting paths between the electrode assembly and the casing on both sides along the second direction Y. When the electrode assembly experiences thermal runaway, the venting efficiency on both sides is higher, improving pressure relief reliability. Especially in "short-blade type cells," the electrode assembly's dimension in the first direction X is larger than its dimension in the second direction Y. When placed along the long side, the electrode assembly easily droops and adheres tightly to the casing under gravity, obstructing the venting channels. This leads to poor venting during thermal runaway, and the high-temperature gas may cause the electrode assembly to melt, forming molten beads that melt through the casing, threatening the safety of the battery cell. By setting sidewalls at both ends in the second direction Y, forming a "U"-shaped structure, venting paths can be maintained even under gravity, improving pressure relief reliability.

[0070] It should be understood that, Figures 4-6 and Figures 8-9 The shown case, where the sidewall portions 12 are respectively provided at both ends of the main body portion 11 along the second direction Y, is merely an example. The insulating member 10 may include only one sidewall portion 12, provided at one end of the main body portion 11 along the second direction Y. For example, when... Figures 4-6 When the first type of battery cell 1A shown is placed along the second direction Y, in order to prevent the electrode assembly 30 from being blown off to the bottom of the housing 40 due to gravity, the side wall portion 12 can be provided only at one end of the main body portion 11 near the bottom of the housing 40. In this embodiment, as shown... Figure 10 As shown, the main body 11 and the side wall 12 together present an "L" shaped structure.

[0071] In some embodiments, the sidewall portion 12 and the main body portion 11 can be integrally molded using an injection molding process with an insulating material. The insulating material can be a material with insulating and heat-resistant properties, such as polypropylene, polycarbonate, or acrylonitrile-butadiene-styrene copolymer.

[0072] In other embodiments, the sidewall portion 12 and the main body portion 11 can also be detachably connected by means of snap-fitting, bonding, riveting, etc.

[0073] In some embodiments, the first direction X refers to the length direction of the battery cell. For example, for a first type of battery cell (i.e., a short-blade shaped battery cell), when the electrode terminals and the pressure relief mechanism are located on the two short sides of the cell, the first direction X is the length direction of the cell, and the second direction Y is the width direction of the cell. When the first type of battery cell is placed along its long side, the second direction Y is the direction of gravity. Figures 3-6 The main body 11 extends along the second direction Y, and the side wall 12 is provided at both ends of the main body 11 along the second direction Y and extends along the first direction X.

[0074] In some embodiments, the first direction X refers to the width direction of the battery cell. For example, for a second type of battery cell (i.e., a long-blade shaped cell), when the electrode terminals and the pressure relief mechanism are located on the same side of the cell, the first direction X is the width direction of the cell, and the second direction Y is the length direction of the cell. Figures 7-9 The main body 11 extends along the second direction Y, and the sidewalls 12 are disposed at both ends of the main body 11 along the second direction Y and extend along the first direction X. In some embodiments, the first direction X is perpendicular to the second direction Y.

[0075] A boss (e.g., a first boss 111 or a second boss 121) is a protruding structure on the insulating member 10 for abutting against and providing support to the electrode assembly. In some embodiments, the shape and size of the boss may be determined based on actual design requirements. For example, as Figure 3 , Figure 4 and Figure 9 As shown, the boss can be a square boss. In other embodiments, the boss can also be arc-shaped, trapezoidal, or other shapes according to design requirements.

[0076] In some embodiments, an exhaust channel (e.g., a first exhaust channel 1111 or a second exhaust channel 1211) is provided on the sidewall of the boss perpendicular to the second direction Y. The exhaust channel is used to guide high-temperature gas in the battery, reducing the risk of localized accumulation or non-directional eruption of high-temperature gas.

[0077] A first protrusion 111 is provided on the main body 11. In some embodiments, the main body 11 is provided with a plurality of spaced-apart first protrusions 111 along the second direction Y. Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the main body 11 has two spaced-apart first protrusions 111 along the second direction Y. The two first protrusions 111 are respectively located on both sides of the middle region of the main body 11 along the second direction Y. The middle region refers to the area with the geometric center of the main body 11 as the center and a predetermined length as the radius. It should be understood that the above figure is only an example, and the number of first protrusions 111 on the main body 11 can be more than two. For example, more than two first protrusions 111 are provided on the main body 11, and the distance between two adjacent first protrusions 111 can be the same or different. The number of first protrusions 111, the distance between two adjacent first protrusions in the second direction Y, and the distance between each first protrusion 111 and the connection end of the main body 11 and the side wall 12 in the second direction Y can be determined based on specific design requirements (such as battery cell size, application scenario, and pressure relief requirements).

[0078] The first exhaust passage 1111 refers to the exhaust passage provided on the first boss 111. In some embodiments, the first boss 111 is provided with a plurality of first exhaust passages 1111, and the plurality of first exhaust passages 1111 penetrate the side wall of the first boss 111 perpendicular to the second direction Y, so that gas can flow along the second direction Y.

[0079] In some embodiments, one or more second protrusions 121 are provided on the sidewall portion 12. In some embodiments, one or more second protrusions 121 are provided at the free end of the sidewall portion 12. The sidewall portion 12 extends along a first direction X, and therefore has two ends in the first direction X. One end is connected to the main body portion 11 and can be referred to as the connecting end on the sidewall portion 12; the other end is the free end. It should be understood that "one or more second protrusions 121 are provided at the free end" means that one or more second protrusions 121 are provided within a certain distance range from the free end along the first direction X. Figures 3-6 as well as Figures 8-10 As shown, in the first direction X, the second protrusion 121 is positioned closer to the free end relative to the connecting end. That is, in the first direction X, the distance between the second protrusion 121 and the free end is less than the distance between the second protrusion 121 and the connecting end. The number of second protrusions 121 and the distance between each second protrusion 121 and the free end (or the connecting end of each second protrusion 121 to the main body 11 and the sidewall 12) in the first direction X can be determined based on specific design requirements.

[0080] In some embodiments, such as Figure 10 As shown, the sidewall portion 12 is provided with at least two second protrusions 121. The at least two second protrusions 121 are spaced apart along the first direction X. Adjacent second protrusions 121 form second exhaust channels 1211.

[0081] The second exhaust passage 1211 refers to the exhaust passage provided on the second boss 121. In some embodiments, the second boss 121 is provided with a plurality of second exhaust passages 1211, which penetrate the side wall of the second boss 121 perpendicular to the first direction X, so that gas can flow along the first direction X.

[0082] By providing at least two second protrusions spaced apart in the first direction X, with each second protrusion abutting against the electrode assembly, the electrode assembly can be stabilized. Simultaneously, the second exhaust channel effectively reduces the risk of the exhaust path between the housing and the electrode assembly becoming blocked due to electrode assembly sagging.

[0083] In some embodiments, the number, shape, and size of the first boss 111 and the second boss 121 may be the same or different, depending on the actual design requirements.

[0084] In some embodiments, the shape, number, and size of the first exhaust passage 1111 and the second exhaust passage 1211 may be the same or different, depending on the actual design requirements.

[0085] In some embodiments of this specification, the main body is provided with first protrusions spaced apart, and multiple first exhaust channels are provided on the first protrusions. These multiple first exhaust channels facilitate the discharge of high-temperature gas in a direction parallel to the first wall plane. By providing sidewall portions, sufficient exhaust gaps can be maintained between the electrode assembly and the housing, reducing the risk of housing rupture caused by poor exhaust, thereby improving the safety and reliability of pressure relief. When a battery cell (e.g., a battery cell corresponding to a short-blade type cell) is placed along its long side, the electrode assembly tends to droop downwards in the second direction Y, close to the housing, resulting in a reduced exhaust gap. By providing sidewall portions at at least one end of the main body along the second direction Y, unobstructed exhaust between the electrode assembly and the housing can be maintained, improving the reliability of pressure relief.

[0086] In some embodiments, such as Figures 3-6 and Figures 8-9 As shown, the first protrusion 111 protrudes towards the electrode assembly 30 relative to the main body 11. That is, in the direction towards the electrode assembly 30, the first protrusion 111 has a certain height higher than the main body 11. When the battery cell vibrates or experiences thermal runaway, the high-temperature gas inside the battery will be pushed towards the first wall 20. The first protrusion 111, which protrudes towards the electrode assembly 30 relative to the main body 11, can occupy the space between the electrode assembly 30 and the first wall 20 along the first direction X, thereby forming a physical barrier in the displacement direction of the electrode assembly (i.e., limiting the displacement distance of the electrode assembly) and preventing the electrode assembly from contacting the first wall 20 and causing a short circuit.

[0087] In some embodiments, such as Figures 3-6 and Figures 8-9 As shown, the second boss 121 protrudes towards the electrode assembly 30 relative to the sidewall portion 12. That is, in the direction towards the electrode assembly 30, the second boss 121 has a certain height higher than the sidewall portion 12. The second boss 121, which protrudes towards the electrode assembly 30 relative to the sidewall portion 12, can occupy the space between the electrode assembly and the housing 40 in the second direction Y, thereby forming a support on the side of the electrode assembly facing the housing 40, separating the electrode assembly from the housing 40, and preventing the exhaust passage from being blocked due to the electrode assembly being attached to the inner wall of the housing 40.

[0088] In some embodiments, the housing 24 further includes a second wall 22. For example, when the pressure relief mechanism 52 and the electrode terminal 51 are located on different end faces, such as... Figure 3 As shown, the outer casing 24 includes a housing 40, a first wall 20, and a second wall 22. The second wall 22 is connected to the end of the housing 40 away from the first wall 20 along a first direction X.

[0089] In some embodiments, a pressure relief mechanism 52 and an electrode terminal 51 are respectively provided on the first wall 20 and the second wall 22. For example, the pressure relief mechanism 52 is provided on the first wall 20, and the electrode terminal 51 is provided on the second wall 22. As another example, the electrode terminal 51 is provided on the first wall 20, and the pressure relief mechanism 52 is provided on the second wall 22. In the above embodiments, the dimension of the housing 24 in the second direction Y is smaller than the dimension of the housing 24 in the first direction X. That is, the pressure relief mechanism 52 and the electrode terminal 51 are respectively provided on the two short sides of the short-blade-shaped battery cell.

[0090] In some embodiments, the sidewall portion of the insulating member near the first wall is located on one side of the electrode assembly in the second direction Y, and the sidewall portion of the insulating member near the second wall is located on the other side of the electrode assembly in the second direction Y. For example... Figure 11 As shown, the sidewall portion 12 of the insulating member 10 near the first wall 20 is located on one side of the electrode assembly 30 along the second direction Y, and the sidewall portion 12 of the insulating member 10 near the second wall 22 is located on the other side of the electrode assembly 30 along the second direction Y. That is, both insulating members 10 present as shown in the diagram. Figure 10 The L-shaped structure shown is formed by two L-shaped insulating components 10 arranged symmetrically.

[0091] The two symmetrically arranged L-shaped insulating members can ensure that the electrode assembly is supported on both sides along the second direction Y, while leaving sufficient exhaust gaps on both sides to improve exhaust efficiency.

[0092] In some embodiments, the distance between the second boss 121 and the first wall 20 is less than the distance between the second boss 121 and the second wall 22. "Second boss 121" refers to the second boss 121 on the insulating member 10 near the first wall 20. The distance between the second boss 121 and the first wall 20 or the second wall 22 refers to the minimum distance from the geometric center point of the second boss 121 to the plane of the first wall 20 or the second wall 22 along the first direction X. Figure 3 As shown, the distance between the second boss 121 on the insulating member 10 near the first wall 20 and the first wall 20 is L1, and the distance between it and the second wall 22 is L2, where L1 is less than L2.

[0093] By placing the second protrusion on the insulating member near the first wall at a position closer to the first wall, the support effect of the second protrusion on the electrode assembly on the first wall side can be improved, reducing the risk of poor exhaust caused by the contact between the electrode assembly and the housing.

[0094] In some embodiments, the first type of battery cell 1A further includes an insulating member 10 between the second wall 22 and the electrode assembly 30. The structure of this insulating member 10 is the same as that of the insulating member 10 between the first wall 20 and the electrode assembly 30. In some embodiments, the insulating member near the second wall is spaced apart from the insulating member near the first wall. Figure 3 and Figure 4 The insulating member 10 near the second wall 22 is spaced apart from the insulating member 10 near the first wall 20 in the first direction X. That is, there is a gap between the free end of the side wall portion 12 of the insulating member 10 near the second wall 22 and the free end of the side wall portion 12 of the insulating member 10 near the first wall 20 in the first direction X, and they are not connected to each other. The spaced insulating members facilitate the assembly of the entire battery cell.

[0095] In some embodiments, the distance between the second protrusion 121 on the insulating member 10 near the second wall 22 and the first wall 20 is greater than the distance between the second protrusion 121 and the second wall 22. For example... Figure 3 As shown, the distance between the second boss 121 on the insulating member 10 near the second wall 22 and the first wall 20 is L11, and the distance between the second boss 121 and the second wall 22 is L21, where L11 is greater than L21.

[0096] By placing the second boss on the insulating member near the second wall at a position closer to the second wall, the supporting effect of the second boss on the electrode assembly on the second wall side can be improved, and the risk of the electrode assembly on the second wall side squeezing the housing can be reduced.

[0097] In some embodiments, the distance between the second boss and the end of the sidewall portion away from the main body is greater than the distance between the second boss and the end of the sidewall portion near the main body. That is, the distance between the second boss 121 and the free end of the sidewall portion 12 is greater than the distance between the second boss 121 and the connecting end of the sidewall portion.

[0098] By placing the second boss closer to the connection end, the support effect of the second boss on the end of the electrode assembly can be improved, reducing the risk of the end of the electrode assembly squeezing the housing.

[0099] In some embodiments, the distance between the second boss and the end of the sidewall portion away from the main body is less than the distance between the second boss and the end of the sidewall portion near the main body. That is, the distance between the second boss 121 and the free end of the sidewall portion 12 is less than the distance between the second boss 121 and the connecting end of the sidewall portion.

[0100] By placing the second boss closer to the free end, sufficient venting clearance can be ensured between the second boss and the main body, reducing the risk of casing rupture caused by poor venting, thereby improving the safety and reliability of pressure relief.

[0101] In some embodiments, the length of the sidewall portion 12 along the first direction X is greater than 10% and less than 60% of the length of the electrode assembly 30 along the first direction X. For example, the length of the sidewall portion 12 along the first direction X is greater than 20% and less than 50% of the length of the electrode assembly 30 along the first direction X.

[0102] The length of the sidewall portion 12 along the first direction X refers to the distance between the connecting end of the sidewall portion 12 and the free end of the sidewall portion 12 along the first direction X.

[0103] The length of electrode assembly 30 in the first direction X refers to the distance between the two ends of electrode assembly 30 along the first direction X.

[0104] In some embodiments of this specification, by limiting the length of the sidewall portion, on the one hand, the second boss can provide sufficient support for the electrode assembly to prevent the electrode assembly from sinking, and on the other hand, it can avoid material waste and cost increase caused by excessive extension of the sidewall portion, thereby achieving a balance between support function and cost control.

[0105] In some embodiments, the height of the first protrusion 111 in the first direction X is greater than the tab space and less than the distance between the first wall 20 and the electrode assembly 30.

[0106] The height of the first boss 111 in the first direction X refers to the maximum dimension of the first boss 111 in the first direction X.

[0107] The tab space refers to the space occupied by the tab when it is bent into the required shape during the assembly of the battery cell, as well as the reserved space required to avoid interference between the electrode assembly and surrounding components (such as the first wall 20, the insulating component 10, the housing 40, etc.).

[0108] The distance between the first wall 20 and the electrode assembly 30 refers to the minimum distance along the first direction X between the surface of the first wall 20 facing the electrode assembly 30 and the surface of the electrode assembly 30 facing the first wall 20.

[0109] As an example only, considering the size of the tab space and the distance between the first wall 20 and the electrode assembly 30, the height of the first protrusion 111 in the first direction X can be in the range of 2mm-11mm. For example, the height of the first protrusion 111 in the first direction X can be in the range of 3mm-10mm.

[0110] In some embodiments of this specification, the height of the first protrusion in the first direction X is greater than the space between the electrode tabs. This allows the first protrusion to abut against the electrode assembly, preventing excessive bending or displacement of the electrode assembly. This creates an electrical clearance between the first wall and the electrode assembly, reducing the risk of a short circuit caused by the electrode assembly contacting the first wall. Simultaneously, the height of the first protrusion in the first direction X is less than the distance between the first wall and the electrode assembly. This reduces the risk of the first protrusion being too high, affecting the assembly of the battery cell or compressing the electrode assembly, and also provides sufficient buffer space for high-temperature gas flow. In summary, by reasonably controlling the height of the first protrusion in the first direction X, the volumetric energy density of the battery cell can be maintained while ensuring electrical safety and venting functionality.

[0111] In some embodiments, the height of the second boss 121 in the second direction Y is less than half of the gap between the electrode assembly 30 and the housing 40.

[0112] The height of the second boss 121 in the second direction Y refers to the maximum dimension of the second boss 121 in the second direction Y.

[0113] The gap between the electrode assembly 30 and the housing 40 refers to the minimum distance between the surface of the electrode assembly 30 near the housing 40 and the surface of the housing 40 near the electrode assembly 30 along the second direction Y after the electrode assembly 30 is installed in the housing 40.

[0114] As an example only, considering the gap between the electrode assembly 30 and the housing 40, the height of the second boss 121 in the second direction Y can be in the range of 1mm-4mm. For example, the height of the second boss 121 in the second direction Y can be in the range of 1mm-3mm.

[0115] In some embodiments of this specification, limiting the height of the second boss in the second direction Y allows the second boss to both support the electrode assembly and not affect the normal assembly and expansion allowance of the electrode assembly.

[0116] In some embodiments, the width of the first boss 111 in the second direction Y is greater than 8% of the length of the first wall 20 in the second direction Y, and less than 25% of the length of the first wall 20 in the second direction Y. For example, the width of the first boss 111 in the second direction Y is greater than 10% of the length of the first wall 20 in the second direction Y, and less than 20% of the length of the first wall 20 in the second direction Y.

[0117] In some embodiments, the length of the first boss 111 in the third direction Z is greater than 80% of the length of the main body 11 in the third direction Z, and less than the length of the main body 11 in the third direction Z. For example, the length of the first boss 111 in the third direction Z is greater than 90% of the length of the main body 11 in the third direction Z, and less than the length of the main body 11 in the third direction Z.

[0118] The third direction Z refers to the thickness direction of the battery cell. In some embodiments, the third direction Z is perpendicular to the plane defined by the first direction X and the second direction Y.

[0119] The width of the first boss 111 in the second direction Y refers to the maximum dimension of the first boss 111 in the second direction Y.

[0120] The length of the first wall 20 in the second direction Y refers to the distance between the two ends of the first wall 20 along the second direction Y (i.e., the maximum dimension of the first wall 20 in the second direction Y).

[0121] The length of the first protrusion 111 in the third direction Z refers to the maximum dimension of the first protrusion 111 in the third direction Z.

[0122] The length of the main body 11 in the third direction Z refers to the maximum dimension of the main body 11 in the third direction Z.

[0123] In some embodiments of this specification, by limiting the dimensions of the first boss in the second direction Y and the third direction Z, the first boss can provide sufficient bearing area and structural strength to the electrode assembly, while reducing the risk of material waste and encroachment on exhaust space caused by excessive width, thus achieving a balance between protection capability and space utilization.

[0124] In some embodiments, the width of the second boss 121 in the first direction X is greater than 5% of the height of the electrode assembly 30 in the first direction X and less than 25% of the height of the electrode assembly 30 in the first direction X. For example, the width of the second boss 121 in the first direction X is greater than 10% of the height of the electrode assembly 30 in the first direction X and less than 20% of the height of the electrode assembly 30 in the first direction X.

[0125] In some embodiments, the length of the second boss 121 in the third direction Z is greater than 85% of the length of the sidewall portion 12 in the third direction Z, and less than the length of the sidewall portion 12 in the third direction Z. For example, the length of the second boss 121 in the third direction Z is greater than 90% of the length of the sidewall portion 12 in the third direction Z, and less than the length of the sidewall portion 12 in the third direction Z.

[0126] The width of the second boss 121 in the first direction X refers to the maximum dimension of the second boss 121 in the first direction X.

[0127] The height of electrode assembly 30 in the first direction X refers to the maximum dimension of electrode assembly 30 in the first direction X.

[0128] The length of the second boss 121 in the third direction Z refers to the maximum dimension of the second boss 121 in the third direction Z.

[0129] The length of the sidewall portion 12 in the third direction Z refers to the distance between the two ends of the sidewall portion 12 along the third direction Z (i.e., the maximum dimension of the sidewall portion 12 in the third direction Z).

[0130] In some embodiments of the specification, by limiting the dimensions of the second boss in the second direction Y and the third direction Z, the second boss has sufficient support area in the height direction of the housing, which effectively prevents the electrode assembly from falling and blocking the exhaust channel, while avoiding the second boss being too large and affecting the welding space between the electrode assembly and the adapter piece.

[0131] In some embodiments, the number of first protrusions 111 is at least two, and the spacing between adjacent first protrusions 111 along the second direction Y is greater than 10% of the length of the electrode assembly 30 in the first direction X and less than 70% of the length of the electrode assembly 30 in the second direction Y. For example, the spacing between adjacent first protrusions 111 along the second direction Y is greater than 20% of the length of the electrode assembly 30 in the second direction Y and less than 60% of the length of the electrode assembly 30 in the second direction Y.

[0132] For example only, such as Figures 3-6 As shown, there are two first protrusions 111. In other embodiments, such as in larger battery cells, the number of first protrusions 111 may be three, four, or more.

[0133] The interval between adjacent first protrusions 111 along the second direction Y refers to the minimum distance between adjacent first protrusions 111 along the second direction Y.

[0134] The length of electrode assembly 30 in the second direction Y refers to the maximum dimension of electrode assembly 30 in the second direction Y.

[0135] In some embodiments, the distance between the pressure relief mechanism 52 and the first boss 111 in the second direction Y can be determined based on the size of the pressure relief mechanism 52, so as to prevent the direct impact of high-temperature airflow and delay the thermal failure of the first boss 111. Herein, the distance between the pressure relief mechanism 52 and the first boss 111 in the second direction Y refers to the minimum distance between the opening 113 of the pressure relief mechanism and the first boss 111 along the second direction Y.

[0136] As an example only, the distance between the pressure relief mechanism 52 and the first boss 111 in the second direction Y can be in the range of 3mm-25mm. For example, the distance between the pressure relief mechanism 52 and the first boss 111 in the second direction Y can be in the range of 5mm-20mm.

[0137] In some embodiments, the distance between the first boss 111 and the connection end of the main body 11 and the side wall 12 in the second direction Y is greater than 10 mm. By setting the distance between the first boss 111 and the connection end, it is possible to effectively suppress the upward movement of the electrode plate below the opening of the pressure relief mechanism, and to reserve sufficient exhaust space for the connection of the connection end (e.g., weld, snap-fit ​​part), so that the gas can be smoothly discharged.

[0138] In some embodiments of this specification, limiting the number of first protrusions can improve the exhaust efficiency of high-temperature gas. By limiting the distance between adjacent first protrusions, it is possible to avoid the first protrusions being too close together, causing the high-temperature gas flow to directly impact the first protrusion and resulting in thermal failure, and also to prevent the first protrusions from being too far apart, thus failing to effectively suppress the displacement of the electrode plate below the opening of the pressure relief mechanism, allowing the gas to be discharged smoothly.

[0139] In some embodiments, such as Figure 5 , Figure 6 and Figure 9 As shown, the first exhaust passage 1111 and / or the second exhaust passage 1211 include a plurality of through holes 13.

[0140] A through hole 13 refers to a hole-like structure that penetrates the sidewall of the first boss 111 and / or the sidewall of the second boss 121. In some embodiments, the through hole 13 can be set to various shapes based on actual design requirements (application scenario, exhaust requirements, etc.), and the shape of the through hole 13 on the first exhaust channel 1111 and / or the shape of the through hole 13 on the second exhaust channel 1211 can be the same or different. For example, the through hole 13 can be elliptical, circular, rectangular, square, oval, etc.

[0141] In some embodiments, the number of through holes 13 on the first exhaust channel 1111 and / or the second exhaust channel 1211 can be determined based on the size of the battery cell, application scenario, exhaust requirements, etc., and the number of through holes 13 on the first exhaust channel 1111 and the number of through holes 13 on the second exhaust channel 1211 can be the same or different.

[0142] As an example only, the number of through holes 13 on the first exhaust channel 1111 and / or the second exhaust channel 1211 can be 2 to 10, so as to improve the directional emission capability and pressure relief efficiency of high temperature gas under the premise that the first boss 111 and the second boss 121 have a certain structural strength.

[0143] In some embodiments of this specification, by providing multiple through holes in the first exhaust channel and / or the second exhaust channel, and limiting the number and shape of the through holes based on actual needs, the first boss and the second boss can have a certain structural strength while improving the directional emission capability and pressure relief efficiency of high-temperature gas.

[0144] In some embodiments, the area of ​​each through hole 13 can be designed based on actual design requirements (such as the size of the battery cell, the size and number of the first protrusion 111 and the second protrusion 121, exhaust efficiency, etc.). The area of ​​the through hole 13 refers to the opening area of ​​the through hole 13.

[0145] For example only, the area of ​​each through-hole 13 is 10mm. 2 -200mm 2 Within the range.

[0146] In some embodiments of this specification, while ensuring that the strength of the boss structure is not significantly weakened, each through hole has sufficient gas passage capacity to avoid poor venting due to an excessively small through hole area or failure of the boss structure due to an excessively large through hole area.

[0147] Some embodiments of this specification also provide a battery device. The battery device includes one or more battery cells as described in any of the above embodiments. Multiple battery cells are connected in series, parallel, or mixed connections via a busbar. In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cells housed within the housing.

[0148] Some embodiments of this specification also provide an energy storage device, including one or more battery cells or battery devices as described in any of the above embodiments. The battery cells or battery devices are used to store or provide electrical energy.

[0149] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices. In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0150] Some embodiments of this specification also provide an energy storage system, including an energy conversion system and the energy storage device described in the above embodiments. The energy conversion system is connected to the energy storage device to convert energy from current input to the energy storage device or output from the energy storage device.

[0151] In some embodiments, an energy storage system may include one or more energy storage devices and an energy conversion system. The energy conversion system is used to connect a power generation device, a power grid, or a load to the energy storage device. The power generation device generates electrical energy, the energy storage device stores electrical energy, and the energy conversion system converts the current input to the energy storage device or the current output from the energy storage device into energy. The electrical energy generated by the power generation device can be stored in the energy storage device through the energy conversion system, and the electrical energy stored in the energy storage device can also be output to the load or the power grid through the energy conversion system. As an example, the power generation device may specifically be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. The specific type of power generation device is not limited in this application.

[0152] Some embodiments of this specification also provide a charging network, including charging piles and the energy storage device or energy storage system described in any of the above embodiments. The energy storage device is used to provide electrical energy to the charging piles.

[0153] In some embodiments, the charging network includes charging piles and energy storage devices, with the charging piles electrically connected to the energy storage devices. The energy storage devices provide electrical energy to the charging piles. The charging piles are electrically connected to a battery within the energy storage devices via cables, allowing the battery to supply its stored electrical energy to the charging piles. Each charging pile has one or more connectors for connecting to electrical equipment (such as vehicles) to replenish the energy of the equipment. The energy storage devices can be located inside the charging pile (e.g., an integrated charging and energy storage unit) or outside the charging pile.

[0154] The beneficial effects that the embodiments of this specification may bring include, but are not limited to: (1) A first protrusion is provided at intervals on the main body, and a plurality of first exhaust channels are provided on the first protrusion. The plurality of first exhaust channels facilitate the discharge of high temperature gas in a direction parallel to the plane of the first wall. The side wall can provide an exhaust path between the electrode assembly and the housing. The above arrangement can reduce the risk of housing rupture caused by poor exhaust when the electrode assembly experiences thermal runaway, thereby improving the safety and reliability of pressure relief; (2) The first protrusion protruding towards the electrode assembly relative to the main body can occupy the space between the electrode assembly and the first wall along the first direction, thereby forming a physical barrier in the displacement direction of the electrode assembly (i.e., limiting the displacement distance of the electrode assembly), preventing the electrode assembly from contacting the first wall and causing a short circuit; (3) The second protrusion protruding towards the electrode assembly relative to the side wall can occupy the space between the electrode assembly and the housing in the first direction, thereby forming a support on the side of the electrode assembly facing the housing, separating the electrode assembly from the housing, and preventing the exhaust channel from being blocked due to the electrode assembly attaching to the inner wall of the housing.

[0155] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0156] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0157] Similarly, it should be noted that, in order to simplify the description disclosed herein and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of embodiments in this specification may sometimes combine multiple features into a single embodiment, drawing, or description thereof. However, this method of disclosure does not imply that the subject matter of this specification requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of a single embodiment disclosed above.

[0158] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of range in some embodiments of this specification are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0159] For each patent, patent application, patent application publication, and other material such as articles, books, specifications, publications, and documents referenced in this specification, the entire contents of which are incorporated herein by reference. This excludes historical application documents that are inconsistent with or conflict with the content of this specification, as well as documents that limit the broadest scope of the claims in this specification (currently or subsequently appended to this specification). It should be noted that in the event of any inconsistency or conflict between the descriptions, definitions, and / or terminology used in the supplementary materials to this specification and the content of this specification, the descriptions, definitions, and / or terminology used in this specification shall prevail.

[0160] Finally, it should be understood that the embodiments in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments in this specification are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments in this specification are not limited to those explicitly described and illustrated herein.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a housing and a first wall, the first wall being connected to one end of the housing along a first direction, and the first wall being provided with electrode terminals and / or a pressure relief mechanism; Electrode assembly, housed within the housing; Insulating components, including: The main body is disposed between the first wall and the electrode assembly. The main body is provided with first protrusions spaced apart along the second direction. The first protrusions are provided with first exhaust channels, which penetrate the first protrusions along the second direction. A sidewall portion, disposed between the housing and the electrode assembly, is connected to at least one end of the main body portion along a second direction and extends along a first direction. A second boss is provided on the sidewall portion, the second boss being configured to abut against the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The second protrusion is provided with a second exhaust channel, which passes through the second protrusion along the first direction.

3. The battery cell according to claim 1, characterized in that, The sidewall portion is provided with at least two second protrusions, and adjacent second protrusions are spaced apart along the first direction to form a second exhaust channel.

4. The battery cell according to claim 1, characterized in that, The second boss protrudes toward the electrode assembly relative to the sidewall portion.

5. The battery cell according to claim 1, characterized in that, The outer casing also includes a second wall, which is connected to the end of the casing away from the first wall along a first direction, and the distance between the second boss and the first wall is less than the distance between the second boss and the second wall.

6. The battery cell according to claim 1, characterized in that, The distance between the second boss and the end of the sidewall portion away from the main body is greater than the distance between the second boss and the end of the sidewall portion closer to the main body; or, The distance between the second boss and the end of the side wall portion away from the main body portion is less than the distance between the second boss and the end of the side wall portion near the main body portion.

7. The battery cell according to any one of claims 1-6, characterized in that, The sidewall portion consists of two parts, which are respectively connected to the two ends of the main body portion in the second direction.

8. The battery cell according to any one of claims 1-6, characterized in that, The first wall is provided with a pressure relief mechanism, and the insulating component is provided with an opening for the pressure relief mechanism. Along the second direction, the first boss is provided on both sides of the opening for the pressure relief mechanism.

9. The battery cell according to claim 8, characterized in that, The first wall is provided with electrode terminals, the insulating member is provided with electrode terminal openings, and the first boss is provided between the electrode terminal openings and the pressure relief mechanism openings.

10. The battery cell according to any one of claims 1-6, characterized in that, The first wall is provided with two electrode terminals, the insulating member is provided with two electrode terminal openings, and the first boss is provided between the two electrode terminal openings.

11. The battery cell according to any one of claims 1-6, characterized in that, The outer casing also includes a second wall, which is connected to the end of the casing away from the first wall along a first direction. The first wall is provided with a pressure relief mechanism, and the second wall is provided with electrode terminals.

12. The battery cell according to claim 11, characterized in that, The size of the outer shell in the second direction is smaller than its size in the first direction.

13. The battery cell according to claim 11, characterized in that, An insulating element is provided between the second wall and the electrode assembly.

14. The battery cell according to claim 13, characterized in that, The insulating element near the second wall is spaced apart from the insulating element near the first wall.

15. The battery cell according to claim 11, characterized in that, The sidewall portion of the insulating member near the first wall is located on one side of the electrode assembly in the second direction, and the sidewall portion of the insulating member near the second wall is located on the other side of the electrode assembly in the second direction.

16. The battery cell according to any one of claims 1-6, characterized in that, The electrode assembly includes multiple electrodes stacked together.

17. The battery cell according to any one of claims 1-6, characterized in that, The length of the sidewall portion along the first direction is greater than 20% and less than 50% of the length of the electrode assembly in the first direction.

18. The battery cell according to any one of claims 1-6, characterized in that, The width of the first boss in the second direction is greater than 10% of the length of the first wall in the second direction, and less than 20% of the length of the first wall in the second direction; The length of the first boss in the third direction is greater than 90% of the length of the main body in the third direction, but less than the length of the main body in the third direction.

19. The battery cell according to any one of claims 1-6, characterized in that, The width of the second boss in the first direction is greater than 10% of the height of the electrode assembly in the first direction, and less than 20% of the height of the electrode assembly in the first direction; The length of the second boss in the third direction is greater than 90% of the length of the sidewall portion in the third direction, but less than the length of the sidewall portion in the third direction.

20. The battery cell according to any one of claims 1-6, characterized in that, The number of the first protrusions is at least two, and the interval between adjacent first protrusions along the second direction is greater than 20% of the length of the electrode assembly in the second direction and less than 60% of the length of the electrode assembly in the second direction.

21. The battery cell according to claim 2, characterized in that, The first exhaust passage and / or the second exhaust passage includes multiple through holes.

22. The battery cell according to claim 21, characterized in that, The area of ​​each through hole is 10mm. 2 -200mm 2 Within the range.

23. A battery device, characterized in that, It includes multiple battery cells as described in any one of claims 1-22.

24. An energy storage device, characterized in that, It includes a plurality of battery cells as described in any one of claims 1-22 or a plurality of battery devices as described in claim 23, wherein the battery cells or the battery devices are used to store or provide electrical energy.

25. An energy storage system, characterized in that, It includes an energy conversion system and an energy storage device as described in claim 24, wherein the energy conversion system is connected to the energy storage device to convert current input to or output from the energy storage device into energy.

26. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 24 or an energy storage system as described in claim 25, wherein the energy storage device is used to provide electrical energy to the charging pile.

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