A battery cell, a battery and an electric device

Abstract

The embodiment of the application relates to the battery technical field, and concretely relates to a battery monomer, a battery and an electric device. The battery monomer comprises a shell, has a first containing cavity; along a first direction, the first containing cavity has opposite first and second side plates; a pole is arranged at the first side plate; a pressure relief area is arranged at the second side plate; a battery cell is accommodated in the first containing cavity, the battery cell is electrically connected with the pole; a separation piece is clamped between the battery cell and the second side plate; the separation piece is provided with an exhaust passage, the exhaust passage is used for guiding gas in the first containing cavity to the pressure relief area; the melting point of the separation piece is T (DEG C), wherein 130 <= T <= 160. The melting point of the separation piece is limited to 130 DEG C-160 DEG C, when high-temperature gas is discharged out of the shell through the pressure relief area, the melting point of the separation piece is greater than the maximum temperature of the battery cell and the maximum temperature of the separation piece, the melting of the separation piece can be avoided, the thermal stability of the separation piece is improved, the separation piece is not easy to melt, and the structural stability of the separation piece is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] As batteries are used more and more widely in various fields, their reliability and safety during production, manufacturing, and use are becoming increasingly important.

[0003] In related technologies, to prevent battery explosions, an explosion-proof valve is typically installed on the battery casing. Generally, the terminals are located at the top of the casing, and the explosion-proof valve at the bottom, to achieve thermoelectric separation and prevent particles ejected from the valve from falling onto the terminals and other electrical components. However, under gravity, the battery cell may fall to the bottom of the casing, causing it to directly block the explosion-proof valve. Therefore, a base plate with venting channels is usually installed at the bottom of the casing to support the battery cell and prevent blockage of the explosion-proof valve.

[0004] However, the current base plate has poor stability, which affects the safety of battery use. Utility Model Content

[0005] This application provides a battery cell, a battery, and an electrical device to improve the stability of the separator, thereby improving the safety of the battery cell.

[0006] Firstly, embodiments of this application provide a single battery cell, comprising:

[0007] The housing has a first receiving cavity; along a first direction, the first receiving cavity has a first side plate and a second side plate positioned opposite each other; a terminal post is provided at the first side plate; a pressure relief area is provided at the second side plate; the pressure relief area is used to crack when the battery cell experiences thermal runaway, so as to release the internal heat of the battery cell; the first direction is the height direction of the housing;

[0008] The battery cell is housed within the first receiving cavity, and the battery cell is electrically connected to the terminal post;

[0009] An isolation element is sandwiched between the battery cell and the second side plate; the isolation element is provided with an exhaust channel, which is used to guide the gas in the first receiving cavity to the pressure relief area;

[0010] The melting point of the insulating component is T (°C), where 130 ≤ T ≤ 160.

[0011] Secondly, embodiments of this application provide a battery, comprising,

[0012] The housing has a second receiving cavity;

[0013] One or more battery cells as described above, wherein one or more of the battery cells are housed within the second receiving cavity.

[0014] Thirdly, embodiments of this application provide an electrical device, including a battery cell as described above, or a battery as described above.

[0015] This application provides a battery cell, battery, and electrical device. By using an isolation component disposed between the cell and the pressure relief area, high-temperature gas can be guided to the pressure relief area in a timely manner through the exhaust channel on the isolation component, so as to discharge the high-temperature gas outside the casing. By limiting the melting point of the isolation component to between 130°C and 160°C, the melting of the isolation component in the event of thermal runaway can be avoided as much as possible, thereby improving the thermal stability of the isolation component and making it less prone to melting. This improves the structural stability of the isolation component and enhances the safety of the battery cell used in this application embodiment. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] Figure 1 This is a first schematic diagram of a battery cell provided in some embodiments of this application;

[0018] Figure 2 A cross-sectional view of a battery cell provided in some embodiments of this application;

[0019] Figure 3 This is a second schematic diagram of a battery cell provided in some embodiments of this application;

[0020] Figure 4 This is a first schematic diagram of a first type of isolation member provided in some embodiments of this application;

[0021] Figure 5 A second schematic diagram of the first type of isolation member provided in some embodiments of this application;

[0022] Figure 6 A partial cross-sectional view of the second type of isolation member provided in some embodiments of this application;

[0023] Figure 7 A partial cross-sectional view of a third type of isolation member provided in some embodiments of this application;

[0024] Figure 8 This is a schematic diagram of a fourth type of isolation member provided in some embodiments of this application, where point A is the area corresponding to the isolation member and the pressure relief zone;

[0025] Figure 9This is a schematic diagram of a fifth type of isolation member provided in some embodiments of this application, wherein when the isolation member is installed in the first receiving cavity, the exhaust port on the isolation member corresponds to the pressure relief area;

[0026] Figure 10 This is a first schematic diagram of a sixth type of isolation member provided in some embodiments of this application, wherein when the isolation member is installed in a first receiving cavity, the exhaust port on the isolation member corresponds to the pressure relief area;

[0027] Figure 11 This is a second schematic diagram of a sixth type of isolation member provided in some embodiments of this application, wherein when the isolation member is installed into the first receiving cavity, the exhaust port on the isolation member corresponds to the pressure relief area;

[0028] Figure 12 This is a first schematic diagram of a seventh type of isolation component provided in some embodiments of this application;

[0029] Figure 13 This is a second schematic diagram of a seventh type of isolation element provided in some embodiments of this application;

[0030] Figure 14 This is a first schematic diagram of an eighth type of isolation member provided in some embodiments of this application, wherein when the isolation member is installed in a first receiving cavity, the exhaust port on the isolation member corresponds to the pressure relief area;

[0031] Figure 15 This is a second schematic diagram of the eighth type of isolation member provided in some embodiments of this application, wherein when the isolation member is installed in the first receiving cavity, the exhaust port on the isolation member corresponds to the pressure relief area.

[0032] Figure label:

[0033] 100. Housing; 110. First side plate; 111. Pole post; 120. Second side plate; 121. Pressure relief area; 130. Third side plate;

[0034] 200. First receiving cavity;

[0035] 300. Battery cell;

[0036] 400, Isolator; 410, Exhaust passage; 411, First exhaust groove; 412, Second exhaust groove; 420, First wall surface; 421, First protrusion; 421a, First convex surface; 421b, Second connecting hole; 430, Second wall surface; 431, Second protrusion; 431a, Second convex surface; 431b, Third connecting hole; 440, First connecting hole; 450, Exhaust port.

[0037] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0039] First, let me explain the terms used in this application:

[0040] Battery cell: It can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery cell, the active materials can be activated by charging after discharge and continue to be used. The battery cell includes a casing and a cell disposed inside the casing.

[0041] Housing: A housing is a component used to provide a space to house electrode assemblies and other parts and isolate them from the external environment. A housing generally includes a body with an opening at at least one end and a receiving cavity. The opening of the housing can be closed by a cover plate, sealing and isolating the internal environment of the battery cell from the external environment. Housing materials include, but are not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film.

[0042] Explosion-proof valve: This refers to a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of a battery cell reaches a predetermined threshold. During battery use, explosion-proof valves are mainly used to prevent excessive pressure buildup that could cause deformation or explosion in the event of thermal runaway or other situations. They allow gas to escape from the battery, thus reducing internal pressure. The materials used in explosion-proof valves are not limited, including but not limited to aluminum, steel, and alloys. The shape of the explosion-proof valve is also not limited, including square, oblong, elliptical, racetrack-shaped, etc. The type of explosion-proof valve is also not limited, such as a notched explosion-proof valve, which can be formed by stamping or laser etching.

[0043] A battery cell is the component in a battery where electrochemical reactions occur; it is the smallest unit in a battery capable of performing electrochemical reactions such as charging and discharging. A battery cell is the basic unit of a battery and typically includes a positive electrode, a negative electrode, and a separator. Lithium-ion battery cells primarily function by the movement of lithium ions between the positive and negative electrodes. In cylindrical cells, a three-layer thin-film structure is wound into a cylindrical electrode assembly, while in cuboid cells, the thin-film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0044] Tabs: Tabs are located on one side of the positive / negative current collector and are formed separately from or integrally with the current collector. They are electrically connected to the current collector to conduct current through the corresponding current collector. Tabs are made of a metal material with good conductivity (such as copper, aluminum, or nickel).

[0045] In related technologies, to prevent battery explosions, an explosion-proof valve is typically installed on the battery casing. Generally, the terminals are located at the top of the casing, and the explosion-proof valve at the bottom, to achieve thermoelectric separation and prevent particles ejected from the valve from falling onto the terminals and other electrical components. However, under gravity, the battery cell may fall to the bottom of the casing, causing it to directly block the explosion-proof valve. Therefore, a base plate with venting channels is usually installed at the bottom of the casing to support the battery cell and prevent blockage of the explosion-proof valve.

[0046] However, the current base plate has poor stability. When the temperature of the base plate itself exceeds the melting point of the base plate or the temperature of the part of the battery cell that is in direct contact with the base plate exceeds the melting point of the base plate, the base plate will melt. The melting of the base plate will cause the battery cell to lose support, affecting the safety of battery use.

[0047] This application provides a battery cell, battery, and electrical device. By using an isolation component disposed between the cell and the pressure relief area, high-temperature gas can be guided to the pressure relief area in a timely manner through the exhaust channel on the isolation component, so as to discharge the high-temperature gas outside the casing. By limiting the melting point of the isolation component to between 130°C and 160°C, the melting of the isolation component in the event of thermal runaway can be avoided as much as possible, thereby improving the thermal stability of the isolation component and making it less prone to melting. This improves the structural stability of the isolation component and enhances the safety of the battery cell used in the embodiments of this application.

[0048] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0049] Firstly, see [the following] Figures 1-3As shown, this application embodiment provides a battery cell including a housing 100. The housing 100 has a first side plate 110, a second side plate 120, and a third side plate 130. The third side plate 130 has a hollow annular structure. The first side plate 110 and the second side plate 120 are respectively connected to the two ends of the third side plate 130, such that the first side plate 110, the second side plate 120, and the third side plate 130 together define a first receiving cavity 200. In this application embodiment, the first side plate 110 and the second side plate 120 are positioned opposite each other in a first direction X. A terminal post 111 is provided on the first side plate 110, and a pressure relief area 121 is provided on the second side plate 120. Here, the first direction X refers to the height direction of the housing 100.

[0050] In this embodiment, the first side plate 110 and the second side plate 120 are connected to the third side plate 130 by welding, so that the battery cell 300 can be accommodated in the first receiving cavity 200, and the battery cell 300 is electrically connected to the electrode post 111 on the first side plate 110 through its own electrode tab.

[0051] See Figures 2-15 As shown in the embodiment of this application, an isolation member 400 is also placed in the first receiving cavity 200. When the battery cell 300 is placed in the first receiving cavity 200, the battery cell 300 can press the isolation member 400 tightly onto the second side plate 120 under the action of gravity. That is to say, the battery cell 300 can cooperate with the second side plate 120 to form a clamping effect on the isolation member 400.

[0052] Further, see Figures 6-7 As shown, an exhaust channel 410 is provided on the isolation member 400, which enables the isolation member 400 to isolate the battery cell 300 from the second side plate 120, preventing the battery cell 300 from being pressed onto the second side plate 120 under gravity and causing the pressure relief area 121 to be blocked. On the other hand, the isolation member 400 can guide the gas generated in the first receiving cavity 200 to the pressure relief area 121 through the exhaust channel 410. That is to say, the exhaust channel 410 provided on the isolation member 400 is connected to the pressure relief area 121, thereby also preventing the isolation member 400 from being pressed onto the second side plate 120 and causing the pressure relief area 121 to be blocked.

[0053] When a battery cell in this embodiment of the application experiences a runaway, high-temperature gas is generated inside the casing 100. This high-temperature gas can be concentrated in the pressure relief area 121 under the guidance of the exhaust channel 410, and discharged outside the casing 100 through the pressure relief area 121 to avoid the battery cell from exploding. When the high-temperature gas is discharged through the pressure relief area 121, some high-temperature particulate matter is also discharged. In this embodiment of the application, the terminal post 111 is disposed on the first side plate 110, so that the terminal post 111 and the electrical components electrically connected to the terminal post 111 are located on different sides of the battery cell from the pressure relief area 121. This prevents high-temperature gas and high-temperature particulate matter from contacting the terminal post 111 and the electrical components electrically connected to the terminal post 111, achieving thermoelectric separation and improving the safety of the battery cell in this embodiment of the application. It can be understood that thermoelectric separation refers to the physical separation of the battery thermal runaway area from the high and low voltage lines. More specifically, in this embodiment of the application, the terminal post 111 and the pressure relief area 121 are respectively disposed on the first side plate 110 and the second side plate 120.

[0054] Furthermore, in this embodiment of the application, the melting point of the insulating member 400 is T (°C), wherein 130≤T≤160.

[0055] During actual use, the temperature of the battery cell 300 in this embodiment of the application will rise. During this process, since the separator 400 is in direct contact with the battery cell 300, the separator 400 will continuously absorb the heat of the battery cell 300. While the separator 400 plays a role in heat dissipation for the battery cell 300, the temperature of the separator 400 itself will also continue to rise. When the temperature of the separator 400 itself is greater than the melting point of the separator 400 or the temperature of the part of the battery cell 300 that is in direct contact with the separator 400 is greater than the melting point of the separator 400, the separator 400 will melt. The melting of the separator 400 will cause the battery cell 300 to lose its support and fall onto the second side plate 120. This makes it easy for the pressure relief area 121 to be blocked if the battery cell 300 is directly pressed onto the second side plate 120.

[0056] Understandably, before the high-temperature gas in the first receiving cavity 200 is discharged from the housing 100 through the pressure relief zone 121, the temperature of the battery cell 300 and the temperature of the isolator 400 will continue to rise because the first receiving cavity 200 is a closed space. When the high-temperature gas is discharged from the housing 100 through the pressure relief zone 121, the temperature of the battery cell 300 and the temperature of the isolator 400 reach their highest values. As the high-temperature gas is discharged, the heat is also discharged through the pressure relief zone 121, so that the temperature of the battery cell 300 and the temperature of the isolator 400 can gradually decrease. This embodiment of the application uses an isolation member 400 disposed between the cell 300 and the pressure relief area 121, so that the high-temperature gas can be guided to the pressure relief area 121 in a timely manner through the exhaust channel 410 on the isolation member 400, so as to discharge the high-temperature gas outside the casing 100. By limiting the melting point of the isolation member 400 to between 130°C and 160°C, the melting of the isolation member 400 in the event of thermal runaway can be avoided as much as possible, thereby improving the thermal stability of the isolation member 400 and making it less prone to melting, thereby improving the structural stability of the isolation member 400 and improving the safety of the battery cell used in this embodiment of the application.

[0057] In some embodiments, the pressure relief zone 121 is the area where the explosion-proof valve or the second side plate 120 is thinnest along the first direction X.

[0058] In some implementations, see Figures 4-7 and Figures 9-11 As shown, the isolator 400 has a first wall surface 420 and a second wall surface 430 along the first direction X. The first wall surface 420 and the second wall surface 430 are positioned opposite each other, with the first wall surface 420 facing the battery cell 300 and the second wall surface 430 facing the second side plate 120. The exhaust channel 410 provided on the isolator 400 includes a first exhaust groove 411 and a second exhaust groove 412. The first exhaust groove 411 is provided on the first wall surface 420, and the second exhaust groove 412 is provided on the second wall surface 430. There is a gap between the isolator 400 and the inner wall of the housing 100, that is, there is a gap between the isolator 400 and the third side plate 130, so that the first exhaust groove 411 and the second exhaust groove 412 are kept in communication through the gap.

[0059] Furthermore, one or more first exhaust grooves 411 are provided on the first wall surface 420, and one or more second exhaust grooves 412 are provided on the second wall surface 430. The number of first exhaust grooves 411 and second exhaust grooves 412 can be adjusted according to the needs of actual application, and there is no particular limitation thereto.

[0060] In this embodiment, when high-temperature gas is generated in the first receiving cavity 200, the high-temperature gas may first enter the first exhaust groove 411, and then be guided by the first exhaust groove 411 to the circumferential extension of the isolation member 400. After that, the high-temperature gas enters the second exhaust groove 412 through the gap between the isolation member 400 and the third side plate 130, and is guided by the second exhaust groove 412 to the pressure relief area 121; or the high-temperature gas may directly enter the second exhaust groove 412 through the gap between the isolation member 400 and the third side plate 130, and be guided by the second exhaust groove 412 to the pressure relief area 121.

[0061] Since the movement of high-temperature gas towards the pressure relief zone 121 will inevitably pass through the second exhaust channel 412, therefore, in this embodiment of the application, see... Figures 8-11 and Figures 14-15 As shown, at least a portion of the second exhaust channels 412 are in communication with the pressure relief zone 121. More specifically, when all of the second exhaust channels 412 are in communication with the pressure relief zone 121, see [reference needed]. Figure 8 As shown, high-temperature gas entering any of the second exhaust channels 412 can directly enter the pressure relief zone 121. When a portion of the second exhaust channels 412 are connected to the pressure relief zone 121, see... Figures 9-11 and Figures 14-15 As shown, the high-temperature gas can flow in different second exhaust channels 412, and then enter the pressure relief zone 121 through the second exhaust channel 412 connected to the pressure relief zone 121.

[0062] It is worth mentioning that, in this embodiment of the application, by providing a first exhaust groove 411 on the first wall surface 420 and a second exhaust groove 412 on the second wall surface 430, the surface area of ​​the isolator 400 can be increased more effectively. That is, the surface area of ​​the isolator 400 that does not contact the battery cell 300 can be increased, which facilitates the heat dissipation of the isolator 400, improves the heat dissipation efficiency of the isolator 400, and thus improves the thermal stability of the isolator 400, making the isolator 400 less prone to melting, thereby improving the structural stability of the isolator 400.

[0063] In some implementations, see Figure 6 and Figure 7 As shown, at least two first protrusions 421 are provided on the first wall surface 420, and the first protrusions 421 protrude from the first wall surface 420, so that a first exhaust groove 411 is formed between two adjacent first protrusions 421. Similarly, at least two second protrusions 431 are provided on the second wall surface 430, and the second protrusions 431 protrude from the second wall surface 430, so that a second exhaust groove 412 is formed between two adjacent second protrusions 431.

[0064] Furthermore, the first protrusion 421 has a first convex surface 421a that is away from the first wall surface 420, so that the isolation member 400 directly contacts the battery cell 300 through the first convex surface 421a on the first protrusion 421. Correspondingly, the second protrusion 431 has a second convex surface 431a that is away from the second wall surface 430, so that the isolation member 400 directly contacts the second side plate 120 through the second convex surface 431a on the second protrusion 431.

[0065] It is understood that, in practical applications, the battery cell of this application embodiment can absorb heat from the battery cell 300 through the first convex surface 421a that is in direct contact with the battery cell 300, thereby achieving heat dissipation of the battery cell 300. Furthermore, the separator 400 can dissipate heat outward through the sidewall of the first exhaust groove 411, the sidewall of the second exhaust groove 412, and the second convex surface 431a, thereby improving the heat dissipation efficiency of the separator 400 on the battery cell 300 and correspondingly improving the heat dissipation efficiency of the separator 400 itself.

[0066] Furthermore, when there are two first protrusions 421, one first exhaust groove 411 is formed accordingly; when there are more than two first protrusions 421, multiple first exhaust grooves 411 are formed accordingly. Similarly, when there are two second protrusions 431, one second exhaust groove 412 is formed accordingly; when there are more than two second protrusions 431, multiple second exhaust grooves 412 are formed accordingly.

[0067] In some implementations, see Figure 8 As shown, in the extending direction of the second exhaust channel 412, the second exhaust channel 412 has a first end and a second end opposite to each other. The first end of the second exhaust channel 412 is in communication with the second end of the second exhaust channel 412, and the high-temperature gas entering the second exhaust channel 412 can move freely between the first end and the second end of the second exhaust channel 412. Furthermore, the second end of the second exhaust channel 412 is further away from the pressure relief zone 121 than the first end of the second exhaust channel 412.

[0068] See Figure 8 As shown in the embodiment of this application, at least a portion of the first ends of the second exhaust grooves 412 have a first orthographic projection on the second side plate 120 along the first direction X, and the first orthographic projection overlaps with the pressure relief area 121. That is to say, at least a portion of the first ends of the second exhaust grooves 412 can be directly connected to the pressure relief area 121.

[0069] It is understandable that when the first ends of a portion of the second exhaust channels 412 are directly connected to the pressure relief zone 121, the high-temperature gas may directly enter the pressure relief zone 121 through one of the second exhaust channels 412; or the high-temperature gas may enter at least one other second exhaust channel 412 through one of the second exhaust channels 412, and then enter the pressure relief zone 121. When the first ends of all the second exhaust channels 412 are directly connected to the pressure relief zone 121, the high-temperature gas entering any one of the second exhaust channels 412 can directly enter the pressure relief zone 121.

[0070] In some implementations, see Figure 7 As shown, a first connecting hole 440 is provided on the isolation member 400, which can connect the adjacent first exhaust groove 411 and second exhaust groove 412.

[0071] It is understandable that when the high-temperature gas in the first receiving cavity 200 enters the first exhaust groove 411, the high-temperature gas can directly enter the second exhaust groove 412 through the first connecting hole 440, without having to enter the second exhaust groove 412 through the gap between the isolation member 400 and the third side plate 130. This shortens the distance that the high-temperature gas needs to enter the pressure relief zone 121, thereby improving the movement efficiency of the high-temperature gas and the discharge efficiency through the pressure relief zone 121.

[0072] Furthermore, the position and number of the first connecting holes 440 can be selectively set according to the needs of actual application.

[0073] It is worth mentioning that, since the first connecting hole 440 is opened inside the isolation member 400 and the distance of the high-temperature gas from the first exhaust groove 411 to the second exhaust groove 412 is shortened, the movement speed of the high-temperature gas in the first connecting hole 440 is faster. As a result, when the high-temperature gas moves rapidly in the first connecting hole 440, the high-temperature gas can carry away some of the heat of the isolation member 400, thereby improving the heat dissipation rate of the isolation member 400 and improving the thermal stability and structural stability of the isolation member 400.

[0074] In some embodiments, when the number of first exhaust grooves 411 is multiple, that is, when the number of first protrusions 421 is greater than two, see [reference needed]. Figure 7 As shown, a second connecting hole 421b is provided on the first protrusion 421, which can connect two adjacent first exhaust grooves 411.

[0075] When high-temperature gas enters the first exhaust groove 411, it can move back and forth between two adjacent first exhaust grooves 411 through the second connecting hole 421b. Since the second connecting hole 421b has a smaller space than the first exhaust groove 411, the high-temperature gas moves faster within the second connecting hole 421b. Because the second connecting hole 421b is located inside the first protrusion 421, when the high-temperature gas moves rapidly within the second connecting hole 421b, it can carry away some of the heat from the first protrusion 421, thereby improving the heat dissipation rate of the insulating member 400 and enhancing its thermal and structural stability.

[0076] It is worth mentioning that when the high-temperature gas moves in the two adjacent first exhaust channels 411, when the high-temperature gas enters the first exhaust channel 411 with the first connecting hole 440, the high-temperature gas can enter the second exhaust channel 412 more quickly through the first connecting hole 440, and then gather in the pressure relief zone 121 more quickly, which can improve the exhaust efficiency of the high-temperature gas.

[0077] Furthermore, in this embodiment, when the number of second exhaust grooves 412 is multiple, that is, when the number of second protrusions 431 is greater than two, see [reference needed]. Figure 7 As shown, a third connecting hole 431b is provided on the second protrusion 431, which can connect two adjacent second exhaust grooves 412.

[0078] When the high-temperature gas enters the second exhaust groove 412, it can move back and forth between two adjacent second exhaust grooves 412 through the third connecting hole 431b. Since the third connecting hole 431b has a smaller space than the second exhaust groove 412, the high-temperature gas moves faster in the third connecting hole 431b. Since the third connecting hole 431b is located inside the second protrusion 431, when the high-temperature gas moves quickly in the third connecting hole 431b, it can carry away some of the heat from the second protrusion 431, thereby improving the heat dissipation rate of the insulating member 400 and improving the thermal stability and structural stability of the insulating member 400.

[0079] It is worth mentioning that when the high-temperature gas moves in the two adjacent second exhaust channels 412, when the high-temperature gas enters the second exhaust channel 412 that is directly connected to the first end of the pressure relief zone 121, the high-temperature gas can gather in the pressure relief zone 121 more quickly, which can improve the exhaust efficiency of the high-temperature gas.

[0080] In some implementations, see Figures 9-11 and Figures 14-15 As shown, an exhaust port 450 is provided on the isolation member 400, and the exhaust port 450 is connected to the pressure relief area 121.

[0081] When the battery cell 300 and the second side plate 120 cooperate to clamp the isolation member 400, since the exhaust port 450 penetrates the isolation member 400, some of the high-temperature gas generated by the battery cell 300 can move directly to the pressure relief zone 121 through the exhaust port 450, thereby improving the exhaust efficiency of the high-temperature gas.

[0082] Correspondingly, when high-temperature gas enters the first exhaust channel 411, some of the high-temperature gas can be directly guided to the exhaust port 450 by the first exhaust channel 411 which is directly connected to the exhaust port 450, while some of the high-temperature gas can enter the first exhaust channel 411 which is directly connected to the exhaust port 450 through the second connecting hole 421b, and then be guided to the exhaust port 450.

[0083] In some embodiments, along the first direction X, the exhaust port 450 has a second orthographic projection on the second side plate 120, and the second orthographic projection at least partially overlaps with the pressure relief area 121.

[0084] It is understandable that, since the exhaust port 450 is disposed through the isolation member 400, as long as the exhaust port 450 remains connected to the pressure relief zone 121, the high-temperature gas can be guided to the pressure relief zone 121. In this embodiment of the application, the second orthographic projection of the exhaust port 450 overlaps with the pressure relief zone 121, that is, at least a part of the exhaust port 450 is connected to the pressure relief zone 121, thereby enabling the exhaust port 450 to guide the high-temperature gas to the pressure relief zone 121.

[0085] In some embodiments, the area of ​​the second orthographic projection of the exhaust port 450 on the second side plate 120 is not less than the area of ​​the pressure relief zone 121, and the second orthographic projection completely covers the pressure relief zone 121.

[0086] It should be noted that the area of ​​the second orthographic projection can be equal to the area of ​​the pressure relief zone 121, or the area of ​​the second orthographic projection can be greater than the area of ​​the pressure relief zone 121, so that the second orthographic projection can completely cover the pressure relief zone 121. In other words, the exhaust port 450 in this embodiment is completely connected to the pressure relief zone 121, thereby increasing the movement rate of high temperature gas through the exhaust port 450 to the pressure relief zone 121.

[0087] In some embodiments, the spacer 400 can be a hollow structure or a solid structure, and there is no particular limitation on this.

[0088] In some implementations, see Figure 6 As shown, along the extension direction perpendicular to the first protrusion 421, the first convex surface 421a of the first protrusion 421 has a width dimension D1 (mm), where 5≤D1≤15.

[0089] Understandably, the insulating member 400 directly contacts the battery cell 300 through the first convex surface 421a of the first protrusion 421. The larger the width dimension D1 (mm) of the first convex surface 421a, the higher the stability of the insulating member 400 supporting the battery cell 300 through the first convex surface 421; conversely, the smaller the width dimension D1 (mm) of the first convex surface 421a, the worse the stability of the insulating member 400 supporting the battery cell 300 through the first convex surface 421. Furthermore, the larger the width dimension D1 (mm) of the first convex surface 421a, the larger the area of ​​the first convex surface 421a; conversely, the smaller the width dimension D1 (mm) of the first convex surface 421a, the smaller the area of ​​the first convex surface 421a.

[0090] In this embodiment of the application, by limiting the width dimension D1 (mm) of the first convex surface 421a to not less than 5mm, the insulating member 400 can stably support the battery cell 300 through the first convex strip 421, and the area of ​​the first convex surface 421a is not too small, so that the insulating member 400 can absorb the heat of the battery cell 300 through the first convex surface 421a, thereby better achieving heat dissipation of the battery cell 300.

[0091] It should be noted that, since the area of ​​the first wall surface 420 is fixed, the larger the width dimension D1 (mm) of the first convex surface 421a, the smaller the total volume of the first exhaust groove 411 formed on the first wall surface 420, resulting in a worse exhaust effect of the first exhaust groove 411. Conversely, the smaller the width dimension D1 (mm) of the first convex surface 421a, the larger the total volume of the first exhaust groove 411 formed on the first wall surface 420, resulting in a better exhaust effect of the first exhaust groove 411.

[0092] In this embodiment of the application, by limiting the width dimension D1 (mm) of the first convex surface 421a to no more than 15mm, there is enough space on the first wall surface 420 to form the first exhaust groove 411, so as to avoid the total volume of the first exhaust groove 411 being too small and to ensure that the first exhaust groove 411 can have a better exhaust effect.

[0093] Further, see Figure 6 As shown, along the extension direction perpendicular to the second protrusion 431, the second convex surface 431a of the second protrusion 431 has a width dimension D2 (mm), where 3≤D2≤12.

[0094] It is understandable that the isolator 400 directly contacts the second side plate 120 through the second convex surface 431a of the second convex strip 431. The larger the width dimension D2 (mm) of the second convex surface 431a, the higher the stability of the isolator 400 supporting the battery cell 300 through the second convex strip 431. Conversely, the smaller the width dimension D2 (mm) of the second convex surface 431a, the worse the stability of the isolator 400 supporting the battery cell 300 through the second convex strip 431.

[0095] In this embodiment of the application, by limiting the width dimension D2 (mm) of the second convex surface 431a to not less than 3mm, the insulating member 400 can stably support the battery cell 300 through the second convex strip 431.

[0096] It should be noted that, since the area of ​​the second wall surface 430 is constant, the larger the width dimension D2 (mm) of the second convex surface 431a, the smaller the total volume of the second exhaust groove 412 formed on the second wall surface 430, resulting in a worse exhaust effect of the second exhaust groove 412. Conversely, the smaller the width dimension D2 (mm) of the second convex surface 431a, the larger the total volume of the second exhaust groove 412 formed on the second wall surface 430, resulting in a better exhaust effect of the second exhaust groove 412.

[0097] In this embodiment of the application, by limiting the width dimension D2 (mm) of the second convex surface 431a to no more than 12mm, there is enough space on the second wall surface 430 to form the second exhaust groove 412, so as to avoid the total volume of the second exhaust groove 412 being too small and to ensure that the second exhaust groove 412 can have a better exhaust effect.

[0098] In some embodiments, the ratio of the total area of ​​the first convex surface 421a on the spacer 400 to the area of ​​the first wall surface 420 is 0.25-0.75.

[0099] In this embodiment, using the area of ​​the first wall surface 420 as a reference, the ratio of the total area of ​​the first convex surface 421a to the area of ​​the first wall surface 420 is defined to ensure that the total area of ​​the first convex surface 421a is neither too large nor too small. This allows the insulating member 400 to stably support the battery cell 300 through the first convex strip 421, and the insulating member 400 to absorb the heat of the battery cell 300 through the first convex surface 421a, thus achieving better heat dissipation for the battery cell 300. It also ensures that there is sufficient space on the first wall surface 420 to form the first exhaust groove 411, preventing the total volume of the first exhaust groove 411 from being too small and ensuring that the first exhaust groove 411 has a better exhaust effect.

[0100] Furthermore, the ratio of the total area of ​​the second convex surface 431a on the isolation member 400 to the area of ​​the second wall surface 430 is 0.25-0.75.

[0101] In this embodiment, using the area of ​​the second wall surface 430 as a reference, the ratio of the total area of ​​the second convex surface 431a to the area of ​​the second wall surface 430 is defined so that the total area of ​​the second convex surface 431a is not too large or too small. This ensures that the separator 400 can stably support the battery cell 300 through the second convex strip 431, and also ensures that there is enough space on the second wall surface 430 to form the second exhaust groove 412, avoiding that the total volume of the second exhaust groove 412 is too small, and ensuring that the second exhaust groove 412 can have a better exhaust effect.

[0102] In some implementations, see Figure 6 As shown, along the extension direction perpendicular to the first exhaust groove 411, the first exhaust groove 411 has a width dimension D3 (mm), where 7≤D3≤18.

[0103] In this embodiment of the application, by limiting the width dimension D3 (mm) of the first exhaust groove 411 to the range of 7mm-18mm, it is possible to ensure that the first exhaust groove 411 has a better total volume, thereby enabling the first exhaust groove 411 to have a better exhaust effect.

[0104] Further, see Figure 6 As shown, along the extension direction perpendicular to the second exhaust groove 412, the second exhaust groove 412 has a width dimension D4 (mm), where 10≤D4≤20.

[0105] In this embodiment of the application, by limiting the width dimension D4 (mm) of the second exhaust groove 412 to the range of 10mm-20mm, it is possible to ensure that the second exhaust groove 412 has a better total volume, thereby enabling the second exhaust groove 412 to have a better exhaust effect.

[0106] In some implementations, see Figure 6 As shown, along the first direction X, the first exhaust groove 411 has a depth dimension H1 (mm), where 0.5≤H1≤1.

[0107] In this embodiment of the application, by limiting the depth dimension H1 (mm) of the first exhaust groove 411 to the range of 0.5mm-1mm, it can be ensured that the first exhaust groove 411 has a better total volume, thereby enabling the first exhaust groove 411 to have a better exhaust effect.

[0108] Further, see Figure 6 As shown, along the first direction X, the second exhaust groove 412 has a depth dimension H2 (mm), where 0.3≤H2≤1.

[0109] In this embodiment of the application, by limiting the depth dimension H2 (mm) of the second exhaust groove 412 to the range of 0.3mm-1mm, it is possible to ensure that the second exhaust groove 412 has a better total volume, thereby enabling the second exhaust groove 412 to have a better exhaust effect.

[0110] In some embodiments, along the first direction X, the ratio of the total area of ​​the first convex surface 421a on the isolation member 400 to the total area of ​​the first exhaust groove 411 is 0.33-3. This ensures that the total area of ​​the first convex surface 421a and the total area of ​​the first exhaust groove 411 are neither too large nor too small. This allows the isolation member 400 to stably support the battery cell 300 through the first convex strip 421, and the isolation member 400 to absorb heat from the battery cell 300 through the first convex surface 421a, thus achieving better heat dissipation for the battery cell 300. It also prevents the total volume of the first exhaust groove 411 from being too small, ensuring that the first exhaust groove 411 has a better exhaust effect.

[0111] Furthermore, along the first direction X, the ratio of the total area of ​​the second convex surface 431a on the isolation member 400 to the total area of ​​the second exhaust groove 412 is 0.33-3, so that the total area of ​​the second convex surface 431a and the total area of ​​the second exhaust groove 412 are not too large or too small, so that the isolation member 400 can stably support the battery cell 300 through the second convex strip 431, and also avoid the total volume of the second exhaust groove 412 being too small, ensuring that the second exhaust groove 412 can have a better exhaust effect.

[0112] In some embodiments, along the first direction X, the spacer 400 has a third orthographic projection on the second side plate 120, and the ratio of the area of ​​the third orthographic projection to the area of ​​the second side plate 120 is 0.6348-0.8536.

[0113] It is understandable that when the ratio of the area of ​​the third orthographic projection to the area of ​​the second side plate 120 is 1:1, it is not easy to install the isolation member 400 into the first receiving cavity 200, and the gap between the isolation member 400 and the third side plate 130 is small, which is not conducive to the passage of high-temperature gas and affects the movement efficiency of high-temperature gas from the first exhaust groove 411 to the second exhaust groove 412.

[0114] In this embodiment, by limiting the ratio of the area of ​​the third orthographic projection to the area of ​​the second side plate 120 to 0.6348-0.8536, the isolation member 400 is relatively small, which facilitates the installation of the isolation member 400 into the first receiving cavity 200. Furthermore, there is a large gap between the isolation member 400 and the third side plate 130, which facilitates the passage of high-temperature gas and can improve the movement efficiency of high-temperature gas from the first exhaust groove 411 to the second exhaust groove 412.

[0115] In some embodiments, the ratio of the width of the spacer 400 to the width of the second side plate 120 is 0.69-0.88, and further, the ratio of the length of the spacer 400 to the length of the second side plate 120 is 0.92-0.97.

[0116] Secondly, the embodiments of this application provide a battery including the aforementioned battery cell, and therefore, it can possess the corresponding technical effects and advantages described above.

[0117] The battery in this embodiment of the application also includes a housing, the interior of which forms a second receiving cavity; the battery cells are housed in the second receiving cavity.

[0118] Furthermore, the number of battery cells can be set to multiple, with multiple battery cells simultaneously housed in the second receiving cavity, and the multiple battery cells interconnected by series or parallel connection.

[0119] Thirdly, the embodiments of this application provide an electrical device that includes the aforementioned battery cell or the aforementioned battery, and thus can possess the corresponding technical effects and advantages described above.

[0120] Finally, it should be noted that other embodiments of this utility model will readily conceive of by those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A single battery cell, characterized in that: include, The housing (100) has a first receiving cavity (200); along a first direction, the first receiving cavity (200) has a first side plate (110) and a second side plate (120) positioned opposite each other; a terminal post (111) is provided at the first side plate (110); a pressure relief area (121) is provided at the second side plate (120); the pressure relief area (121) is used to crack when the battery cell experiences thermal runaway in order to release the internal heat of the battery cell; the first direction is the height direction of the housing (100); The battery cell (300) is housed in the first receiving cavity (200), and the battery cell (300) is electrically connected to the terminal (111); An isolation element (400) is sandwiched between the battery cell (300) and the second side plate (120); an exhaust channel (410) is provided at the isolation element (400), the exhaust channel (410) is used to guide the gas in the first receiving cavity (200) to the pressure relief area (121). The melting point of the isolation element (400) is T (°C), where 130 ≤ T ≤ 160.

2. The battery cell according to claim 1, characterized in that: The separator (400) has a first wall surface (420) facing the battery cell (300) and a second wall surface (430) facing the second side plate (120); the exhaust channel (410) includes a first exhaust groove (411) and a second exhaust groove (412); One or more first exhaust channels (411) are provided at the first wall surface (420); one or more second exhaust channels (412) are provided at the second wall surface (430); at least a portion of the second exhaust channels (412) are connected to the pressure relief zone (121); There is a gap between the isolation member (400) and the inner wall of the housing (100), and the first exhaust groove (411) and the second exhaust groove (412) are connected through the gap.

3. The battery cell according to claim 2, characterized in that: At least two first protrusions (421) are provided on the first wall surface (420), and the first exhaust groove (411) is formed between two adjacent first protrusions (421). At least two second protrusions (431) are provided on the second wall surface (430), and a second exhaust groove (412) is formed between two adjacent second protrusions (431).

4. The battery cell according to claim 2, characterized in that: One or more of the second exhaust channels (412) have a first end and a second end that are in communication with each other; At least a portion of the first ends of the second exhaust channels (412) have a first orthographic projection on the second side plate (120) along the first direction, the first orthographic projection overlapping the pressure relief area (121).

5. The battery cell according to claim 2, characterized in that: The isolation member (400) is provided with a first connection hole (440), which is used to connect the adjacent first exhaust groove (411) and second exhaust groove (412).

6. The battery cell according to claim 3, characterized in that: When there are multiple first exhaust grooves (411), a second connecting hole (421b) is provided at the first protrusion (421), and the second connecting hole (421b) is used to connect two adjacent first exhaust grooves (411). And / or, when there are multiple second exhaust grooves (412), a third connecting hole (431b) is provided at the second protrusion (431), the third connecting hole (431b) is used to connect two adjacent second exhaust grooves (412).

7. The battery cell according to any one of claims 1-6, characterized in that: An exhaust port (450) is provided at the isolation element (400), and the exhaust port (450) is connected to the pressure relief zone (121).

8. The battery cell according to claim 7, characterized in that: Along the first direction, the exhaust port (450) has a second orthographic projection on the second side plate (120), the second orthographic projection at least partially overlapping the pressure relief area (121).

9. The battery cell according to claim 8, characterized in that: The area of ​​the second orthographic projection is not less than the area of ​​the pressure relief zone (121).

10. The battery cell according to any one of claims 1-6 and 8-9, characterized in that: The isolation element (400) has a hollow structure.

11. The battery cell according to claim 3 or 6, characterized in that: The first protrusion (421) has a first convex surface (421a) away from the first wall surface (420), and the width dimension of the first convex surface (421a) is D1 (mm), wherein 5≤D1≤15; And / or, the second convex strip (431) has a second convex surface (431a) away from the second wall surface (430), the width dimension of the second convex surface (431a) is D2 (mm), where 3≤D2≤12.

12. The battery cell according to claim 3 or 6, characterized in that: The first protrusion (421) has a first protrusion (421a) away from the first wall surface (420), and the ratio of the total area of ​​the first protrusion (421a) at the separator (400) to the area of ​​the first wall surface (420) is 0.25-0.75; And / or, the second convex strip (431) has a second convex surface (431a) away from the second wall surface (430), and the ratio of the total area of ​​the second convex surface (431a) at the spacer (400) to the area of ​​the second wall surface (430) is 0.25-0.

75.

13. The battery cell according to any one of claims 2-6, characterized in that: The width of the first exhaust groove (411) is D3 (mm), where 7≤D3≤18; And / or, the width dimension of the second exhaust groove (412) is D4 (mm), where 10≤D4≤20.

14. The battery cell according to any one of claims 2-6, characterized in that: The depth dimension of the first exhaust groove (411) is H1 (mm), where 0.5≤H1≤1; And / or, the depth dimension of the second exhaust groove (412) is H2 (mm), where 0.3≤H2≤1.

15. The battery cell according to claim 3 or 6, characterized in that: The first protrusion (421) has a first convex surface (421a) away from the first wall surface (420); along the first direction, the ratio of the total area of ​​the first convex surface (421a) at the isolation member (400) to the total area of ​​the first exhaust groove (411) is 0.33-3; And / or, the second convex strip (431) has a second convex surface (431a) away from the second wall surface (430); along the first direction, the ratio of the total area of ​​the second convex surface (431a) at the separator (400) to the total area of ​​the second exhaust groove (412) is 0.33-3.

16. The battery cell according to any one of claims 1-6 and 8-9, characterized in that: Along the first direction, the isolation member (400) has a third orthographic projection on the second side plate (120), the area of ​​which is 0.6348-0.8536 to the area of ​​the second side plate (120).

17. The battery cell according to any one of claims 1-6 and 8-9, characterized in that: The ratio of the width of the isolation element (400) to the width of the second side plate (120) is 0.69-0.88; And / or, the ratio of the length dimension of the separator (400) to the length dimension of the second side plate (120) is 0.92-0.

97.

18. A battery, characterized in that: include, The housing has a second receiving cavity; One or more battery cells as described in any one of claims 1-17, wherein the one or more battery cells are housed within the second receiving cavity.

19. An electrical appliance, characterized in that: It includes the battery cell as described in any one of claims 1-17, or the battery as described in claim 18.

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