Battery cell, battery pack, and electric device

Abstract

The application provides a battery monomer, a battery pack and a power utilization device, and relates to the technical field of battery packs, and in particular to a battery monomer, a battery pack and a power utilization device. The shell of the battery monomer comprises a first shell wall and a second shell wall arranged oppositely, a third shell wall and a fourth shell wall arranged adjacently, and a fifth shell wall and a sixth shell wall arranged adjacently; one end of the third shell wall away from the fourth shell wall is connected with the first shell wall, and one end of the fourth shell wall away from the third shell wall is connected with the second shell wall; one end of the fifth shell wall away from the sixth shell wall is connected with the first shell wall, and one end of the sixth shell wall away from the fifth shell wall is connected with the second shell wall; the third shell wall is located on the side of the first shell wall and the fourth shell wall facing the inner cavity of the shell; and the fifth shell wall is located on the side of the first shell wall and the sixth shell wall facing the inner cavity of the shell. A pole is arranged on the fourth shell wall and / or the sixth shell wall. A first explosion-proof valve is arranged on the third shell wall. A second explosion-proof valve is arranged on the fifth shell wall. The battery monomer provided by the application is beneficial to reducing the risk of thermal runaway of the battery pack.

Description

Technical Field

[0001] This application relates to the field of new energy equipment technology, specifically to a battery cell, a battery pack, and an electrical device. Background Technology

[0002] With technological advancements, new energy equipment is gaining increasing popularity, especially equipment powered by batteries, which is experiencing a significant market share. Battery packs in new energy equipment typically consist of a housing and individual battery cells assembled within it. Each battery cell's casing usually features an explosion-proof valve to release gas from the cell and then from the housing when excessive pressure occurs. However, in related technologies, the venting channels between adjacent battery cells or between a battery cell and the housing wall are often small, resulting in a higher risk of thermal runaway. Utility Model Content

[0003] This application provides a battery cell, a battery pack, and an electrical device to address the problem of how to reduce the risk of thermal runaway in a battery pack.

[0004] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a housing, terminals, a first explosion-proof valve, and a second explosion-proof valve. The housing includes a first and a second housing wall disposed opposite to each other, a third and a fourth housing wall connected together, and a fifth and a sixth housing wall connected together. One end of the third housing wall away from the fourth housing wall is connected to the first housing wall, and one end of the fourth housing wall away from the third housing wall is connected to the second housing wall. One end of the fifth housing wall away from the sixth housing wall is connected to the first housing wall, and one end of the sixth housing wall away from the fifth housing wall is connected to the second housing wall. The third housing wall is located on the side of the first housing wall facing the inner cavity of the housing, and the side of the fourth housing wall facing the inner cavity of the housing. The fifth housing wall is located on the side of the first housing wall facing the inner cavity of the housing, and the side of the sixth housing wall facing the inner cavity of the housing. Terminals are disposed on the fourth housing wall and / or the sixth housing wall. The first explosion-proof valve is disposed on the third housing wall and communicates with the inner cavity of the housing. The second explosion-proof valve is disposed on the fifth housing wall and communicates with the inner cavity of the housing.

[0006] In some possible implementations of the first aspect, the poles include a positive pole and a negative pole; the positive pole and the negative pole are spaced apart on the fourth shell wall.

[0007] In some possible implementations of the first aspect, the positive and negative terminals are arranged along the length of the fourth shell wall; the center distance D between the positive and negative terminals satisfies the following condition with respect to the length h of the fourth shell wall: 0.55 ≤ D / h ≤ 0.90.

[0008] In some possible implementations of the first aspect, the poles include a positive pole and a negative pole; the positive pole and the negative pole are respectively disposed on the fourth shell wall and the sixth shell wall.

[0009] In some possible implementations of the first aspect, the fourth shell wall also has an injection hole, the distance between the injection hole and the first pole post being less than the distance between the injection hole and the second pole post.

[0010] In some possible implementations of the first aspect, the angle θ between the plane containing the fourth shell wall and the third shell wall satisfies: 30°≤θ≤75°; the angle θ2 between the plane containing the sixth shell wall and the fifth shell wall satisfies: 30°≤θ2≤75°.

[0011] In some possible implementations of the first aspect, the angle θ between the plane containing the fourth shell wall and the third shell wall satisfies: 30°≤θ≤75°.

[0012] In some possible implementations of the first aspect, the angle θ2 between the plane containing the sixth shell wall and the fifth shell wall satisfies: 30°≤θ≤75°.

[0013] In some possible implementations of the first aspect, the extension length C of the third shell wall from the fourth shell wall to the first shell wall satisfies: 8mm≤C≤85mm; and the extension length C2 of the fifth shell wall from the sixth shell wall to the first shell wall satisfies: 8mm≤C2≤85mm.

[0014] In some possible implementations of the first aspect, the extension length C of the third shell wall from the fourth shell wall to the first shell wall satisfies: 8mm ≤ C ≤ 85mm.

[0015] In some possible implementations of the first aspect, the extension length C2 of the fifth shell wall from the sixth shell wall to the first shell wall satisfies: 8mm ≤ C2 ≤ 85mm.

[0016] In some possible implementations of the first aspect, along the first direction, the height B of the third shell wall and the distance H between the first shell wall and the second shell wall satisfy: 0.08≤B / H≤0.38; along the first direction, the height B2 of the fifth shell wall and the distance H between the first shell wall and the second shell wall satisfy: 0.08≤B2 / H≤0.38; where the first direction is the arrangement direction of the first shell wall and the second shell wall.

[0017] In some possible implementations of the first aspect, along the first direction, the height B of the third shell wall and the distance H between the first shell wall and the second shell wall satisfy: 0.08≤B / H≤0.38; where the first direction is the arrangement direction of the first shell wall and the second shell wall.

[0018] In some possible implementations of the first aspect, along the first direction, the height B2 of the fifth shell wall and the distance H between the first shell wall and the second shell wall satisfy: 0.08≤B2 / H≤0.38; where the first direction is the arrangement direction of the first shell wall and the second shell wall.

[0019] Secondly, embodiments of this application provide a battery cell, which includes a housing, a positive electrode post, a negative electrode post, and a first explosion-proof valve. The housing includes a first housing wall and a second housing wall disposed opposite to each other, a third housing wall and a fourth housing wall connected to each other, and a sixth housing wall; one end of the third housing wall away from the fourth housing wall is connected to the first housing wall, and one end of the fourth housing wall away from the third housing wall is connected to the second housing wall; the third housing wall is located on the side of the first housing wall facing the inner cavity of the housing, and on the side of the fourth housing wall facing the inner cavity of the housing; both ends of the sixth housing wall are connected to the first housing wall and the second housing wall, respectively. One of the positive electrode post and the negative electrode post is disposed on the fourth housing wall, and the other is disposed on the sixth housing wall. The first explosion-proof valve is disposed on the third housing wall and communicates with the inner cavity of the housing.

[0020] Thirdly, embodiments of this application provide a battery pack, which includes a housing, individual battery cells, and a third explosion-proof valve. The individual battery cells are disposed within the housing, and each individual battery cell is one of the battery cells described in any of the above implementations. At least a third shell wall of one individual battery cell, together with the housing wall of the housing and / or the shell of an adjacent individual battery cell, forms an exhaust channel. The third explosion-proof valve is disposed on the housing wall of the housing and communicates with the exhaust channel.

[0021] Fourthly, embodiments of this application provide an electrical device, which includes an electrical main body and a battery pack, wherein the battery pack is the aforementioned battery pack and is electrically connected to the electrical main body.

[0022] The battery cell, battery pack, and electrical device provided in this application have the following beneficial effects:

[0023] The battery cell provided in this application, by arranging the first and second shell walls opposite each other, the third and fourth shell walls connected, and the fifth and sixth shell walls connected, with the third shell wall located on the side of the first and fourth shell walls facing the inner cavity of the housing, and the fifth shell wall located on the side of the sixth shell wall and the first shell wall facing the inner cavity of the housing, allows the third and fifth shell walls of the battery cell to form an exhaust channel with a large flow area when the battery cell is assembled in the housing.

[0024] Based on this, by setting the first explosion-proof valve and the second explosion-proof valve on the third shell wall and the fifth shell wall respectively, when the internal pressure of the battery cell increases, the first explosion-proof valve and the second explosion-proof valve can release gas into the exhaust channel, and then quickly discharge it outside the battery pack, thereby reducing the risk of thermal runaway of the battery pack and ensuring the safety and reliability of the battery pack.

[0025] Furthermore, by placing the terminal posts on the fourth and / or sixth shell walls, when assembling the battery cells into the housing, the first shell wall can contact the upper shell wall of the housing. This increases the height of the battery cells in the direction of the first and second shell wall alignment, thereby increasing the capacity of the battery cells. It also supports the upper shell wall and improves the overall strength of the battery pack.

[0026] The beneficial technical effects of the battery pack and electrical equipment provided in this application are the same as those of the battery cell provided in this application, and will not be repeated here. Attached Figure Description

[0027] Figure 1 Schematic diagrams of electrical equipment provided in some embodiments of this application;

[0028] Figure 2 for Figure 1 A cross-sectional structural diagram of the battery pack of the electrical equipment shown.

[0029] Figure 3 for Figure 2 A cross-sectional structural diagram of the battery pack of the electrical equipment shown.

[0030] Figure 4 for Figure 3 A three-dimensional structural diagram of the individual battery cells in the battery pack shown.

[0031] Figure 5 for Figure 4 The front view of the battery cell shown;

[0032] Figure 6 for Figure 4 Side view of the battery cell shown;

[0033] Figure 7 A three-dimensional structural diagram of a battery cell provided for some embodiments of this application;

[0034] Figure 8 for Figure 7 The front view of the battery cell shown;

[0035] Figure 9 A three-dimensional structural diagram of a battery cell provided for some embodiments of this application;

[0036] Figure 10 for Figure 9 The front view of the battery cell shown;

[0037] Figure 11 A three-dimensional structural diagram of a battery cell provided for some embodiments of this application;

[0038] Figure 12 for Figure 11 The front view of the battery cell shown.

[0039] Figure label:

[0040] 100 electrical appliances;

[0041] Power supply unit 110; Battery compartment 110a;

[0042] Battery pack 120; Exhaust channel 120a;

[0043] Box body 121; first inner cavity 121a; first box wall 1211; clearance groove 1211a; second box wall 1212; third box wall 1213; fourth box wall 1214; fifth box wall 1215; sixth box wall 1216;

[0044] Battery cell 122; casing 10; first casing wall 11; liquid injection hole 11a; second casing wall 12; third casing wall 13; fourth casing wall 14; fifth casing wall 15; sixth casing wall 16; seventh casing wall 17; eighth casing wall 18; electrode group 20; terminal post 30; positive terminal post 31; negative terminal post 32; first explosion-proof valve 40; second explosion-proof valve 50;

[0045] The third explosion-proof valve 123. Detailed Implementation

[0046] In the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0047] In the embodiments of this application, it should be understood that the directional terms mentioned, such as "up", "down", "left", "right", "inner", "outer", etc., are only for reference to the direction of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0049] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0050] In the embodiments of this application, "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: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In the embodiments of this application, it should be noted that the descriptions of "vertical" and "parallel" respectively indicate approximately vertical and approximately parallel within a certain error range. This error range can be a range where the deviation angle relative to absolute verticality and absolute parallelism is less than or equal to 5°, 8°, 10° or 20°, respectively, and is not specifically limited here.

[0052] With technological advancements, new energy equipment is gaining increasing popularity, especially equipment powered by batteries, which is experiencing a significant market share. Battery packs in new energy equipment typically consist of a housing and individual battery cells assembled within it. Each battery cell's casing usually features an explosion-proof valve to release gas from the cell and then out of the housing when excessive pressure occurs. However, in related technologies, the venting channels between adjacent battery cells or between a battery cell and the housing wall are often small, resulting in a higher risk of thermal runaway.

[0053] To address the aforementioned issues, this application provides a battery cell in which a shell wall located on the side of the inner cavity facing the shell is connected between two shell walls facing different directions. This allows for the formation of exhaust channels with large flow areas between adjacent battery cells and between the battery cells and the battery pack wall, which is beneficial for improving the safety of the battery pack, reducing the risk of thermal runaway of the battery pack, and thus reducing the risk of thermal runaway of electrical equipment.

[0054] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0055] Please see Figure 1 , Figure 1 This is a schematic diagram of an electrical device 100 provided in some embodiments of this application. Figure 1 In the illustrated embodiment, an electric vehicle is used as an example of the electrical device 100 for illustrative purposes, and this should not be construed as a specific limitation of this application. In other embodiments, the electrical device may also be a mobile phone, a laptop computer, a mobile charging station, or other similar devices.

[0056] Please continue reading. Figure 1 The electrical device 100 includes a power-consuming body 110 and a battery pack 120. The battery pack 120 is fixed to the power-consuming body 110 and electrically connected to the power-consuming components of the power-consuming body 110 to supply power to the power-consuming components of the power-consuming body 110. Specifically, the power-consuming body 110 may have a battery compartment 110a, and the battery pack 120 is fixed inside the battery compartment 110a.

[0057] Please see Figure 2 and Figure 3 , Figure 2 for Figure 1 The diagram shows a cross-sectional view of the battery pack 120 of the electrical device 100. Figure 3 for Figure 2 The diagram shows a cross-sectional view of the battery pack 120 of the electrical device 100. The battery pack 120 may include a housing 121 and at least one row of battery cells 122. The battery cells 122 are disposed in the first inner cavity 121a of the housing 121 and are fixed relative to the housing 121. The housing 121 protects the battery cells 122 from external forces causing vibration and impact that could damage them. The housing 121 may be a metal structure or a plastic structure.

[0058] The enclosure 121 may include a first enclosure wall 1211 and a second enclosure wall 1212 arranged opposite to each other and spaced apart along a first direction, a third enclosure wall 1213 and a fourth enclosure wall 1214 arranged opposite to each other and spaced apart along a third direction, and a fifth enclosure wall 1215 and a sixth enclosure wall 1216 arranged opposite to each other and spaced apart along a second direction. The first enclosure wall 1211, the second enclosure wall 1212, the third enclosure wall 1213, the fourth enclosure wall 1214, the fifth enclosure wall 1215, and the sixth enclosure wall 1216 enclose a first inner cavity 121a of the enclosure 121. The first direction, the third direction, and the second direction may be perpendicular to each other. Figure 1 and Figure 2In the illustrated embodiment, the second direction can be the arrangement direction of the front and rear of the electric vehicle, and the third direction can be the extension direction of the electric vehicle's axle. In other embodiments, the first direction, the third direction, and the second direction can also be other directions, and this application does not limit them.

[0059] The battery cell 122 is the most basic electrochemical unit, capable of storing and releasing electrical energy. The battery cell 122 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 application embodiment does not limit it.

[0060] Figure 2 and Figure 3 In the illustrated embodiment, the battery pack 120 includes two rows of battery cells 122 arranged along a third direction, and one row of battery cells 122 includes multiple battery cells 122 arranged along a second direction. The battery cells 122 within the battery pack 120 can be electrically connected in series, in parallel, or in a mixed configuration. A mixed configuration means that the electrical connections among the multiple battery cells 122 include both series and parallel connections, which can be specifically designed according to the power requirements of the electrical device 100. In other embodiments, the battery pack 120 may also contain only one battery cell 122, i.e., the battery pack 120 includes one row of battery cells 122, and one row of battery cells 122 includes only one battery cell 122.

[0061] Please see Figures 4-6 , Figure 4 for Figure 3 A three-dimensional structural diagram of the battery cell 122 of the battery pack 120 shown. Figure 5 for Figure 4 The front view of the battery cell 122 shown is shown. Figure 6 for Figure 4 The diagram shows a side view of the battery cell 122. The battery cell includes a housing 10, electrode array 20, terminal posts 30, a first explosion-proof valve 40, and a second explosion-proof valve 50. The housing 10 can be a rigid component. The housing 10 can be a metal housing. In some examples, the housing 10 can be an aluminum alloy housing to reduce its weight, which is beneficial for the lightweighting of the battery cell 122 and consequently for the overall lightweighting of the electrical equipment 100. In other examples, the housing 10 can also be a stainless steel housing to give it higher strength, thereby improving the overall strength of the battery cell 122 and providing better resistance to puncture and vibration damage.

[0062] The electrode assembly 20 is disposed within the inner cavity of the housing and immersed in the electrolyte. The electrode assembly 20 includes a positive electrode (not shown), a negative electrode (not shown), and a separator (not shown). The positive electrode can be formed from a positive current collector and a positive active material coated on the current collector. In some examples, the positive current collector can be aluminum foil, and the positive active material can be lithium cobalt oxide (LCO), ternary materials (NCM / NCA), lithium iron phosphate (LFP), etc. The negative electrode can be formed from a negative current collector and a negative active material coated on the current collector. In some examples, the negative current collector can be copper foil, and the negative active material can be graphite, silicon-carbon composite material, etc. The separator is disposed between the positive and negative electrodes to isolate them and prevent short circuits. The separator can be made of porous polyethylene (PE) or polypropylene (PP), etc.

[0063] Specifically, the housing 10 includes a first housing wall 11 and a second housing wall 12 that are opposite to and spaced apart, a third housing wall 13 and a fourth housing wall 14 that are connected, a fifth housing wall 15 and a sixth housing wall 16 that are connected, and a seventh housing wall 17 and an eighth housing wall 18 that are opposite to and spaced apart. The end of the third housing wall 13 away from the fourth housing wall 14 is connected to the first housing wall 11, and the end of the fourth housing wall 14 away from the third housing wall 13 is connected to the second housing wall 12; the end of the fifth housing wall 15 away from the sixth housing wall 16 is connected to the first housing wall 11, and the end of the sixth housing wall 16 away from the fifth housing wall 15 is connected to the second housing wall 12. The third housing wall 13 is located on the side of the first housing wall 11 facing the inner cavity of the housing and on the side of the fourth housing wall 14 facing the inner cavity of the housing. The fifth housing wall 15 is located on the side of the first housing wall 11 facing the inner cavity of the housing and on the side of the sixth housing wall 16 facing the inner cavity of the housing.

[0064] Specifically, the first shell wall 11 and the second shell wall 12 are arranged along the aforementioned first direction, that is, the first direction is the arrangement direction of the first shell wall 11 and the second shell wall 12. The first shell wall 11 and the second shell wall 12 may both be perpendicular to the first direction. The fourth shell wall 14 and the sixth shell wall 16 are arranged along the aforementioned third direction, and the fourth shell wall 14 and the sixth shell wall 16 may both be perpendicular to the third direction, thereby reducing the design and manufacturing difficulty of the shell 10. In some other embodiments, the fourth shell wall 14 and the sixth shell wall 16 may not be perpendicular to the third direction.

[0065] Based on this, the seventh shell wall 17 and the eighth shell wall 18 are arranged along the aforementioned second direction, and are both connected to the aforementioned first shell wall 11, second shell wall 12, third shell wall 13, fourth shell wall 14, fifth shell wall 15 and sixth shell wall 16. In this way, the battery cell 122 is roughly a rectangular body with chamfered corners. The shape of the battery cell 122 is relatively regular, and the design and manufacturing difficulty is low. Figures 4-6In the illustrated embodiment, the first direction is the width direction of the battery cell 122, the second direction is the thickness direction of the battery cell 122, and the third direction is the length direction of the battery cell 122. In some other embodiments, the first direction may also be the length direction of the battery cell 122, and the third direction may be the width direction of the battery cell 122.

[0066] The first explosion-proof valve 40 is disposed on the third shell wall 13 and communicates with the inner cavity of the shell 10. The second explosion-proof valve 50 is disposed on the fifth shell wall 15 and communicates with the inner cavity of the shell 10. When the internal pressure of the battery cell 122 increases due to overcharging, over-discharging, short circuit or external impact, the first explosion-proof valve 40 and the second explosion-proof valve 50 can release gas to prevent the battery cell 122 from exploding due to excessive pressure, thereby ensuring the safety of the battery cell 122 and thus ensuring the overall safety of the battery pack 120.

[0067] The terminal post 30 is disposed on the fourth housing wall 14 and / or the sixth housing wall 16. One end of the terminal post 30 is located in the inner cavity of the housing 10 and is electrically connected to the electrode group 20, and the other end of the terminal post 30 is located outside the housing 10 to connect the battery cell 122 to an external circuit.

[0068] Please return to the reference. Figure 3 When the battery cell 122 is assembled inside the housing 121, the first shell wall 11 can face the first box wall 1211. The first box wall 1211 can be the upper box wall or the lower box wall of the battery pack 120. The first shell wall 11 and / or the second shell wall 12 are fixed to the first box wall 1211 and / or the second box wall 1212 so that the battery cell 122 is fixed in the first inner cavity 121a of the housing 121. At least the third shell wall 13 of a battery cell 122 surrounds the box wall of the housing 121 and / or the shell of the adjacent battery cell 122 to form an exhaust channel 120a.

[0069] Specifically, when the battery pack 120 includes a row of battery cells 122, the outer surface of the sixth shell wall 16 of the battery cell 122 can face the fourth shell wall 1214 of the housing 121. In this way, the third shell wall 13, together with the third shell wall 1213 and the first shell wall 1211 of the housing 121, forms an exhaust channel 120a, and the fifth shell wall 15, together with the first shell wall 1211 and the fourth shell wall 1214 of the housing 121, forms an exhaust channel 120a. When the battery pack 120 includes multiple rows of battery cells 122, the sixth shell wall 16 of the battery cell 122 adjacent to the fourth shell wall 1214 can face the fourth shell wall 1214. The fifth shell wall 15 of this row of battery cells 122 can form an exhaust channel 120a by surrounding the fourth shell wall 1214 and the first shell wall 1211. The third shell wall 13 can form an exhaust channel 120a by surrounding the first shell wall 1211 and the third shell wall 13 or the fifth shell wall 15 of an adjacent row of battery cells 122. When the battery pack 120 includes multiple layers of battery cells 122 arranged along a first direction, and each layer of battery cells 122 includes multiple rows of battery cells 122, the third shell wall 13 or the fifth shell wall 15 of a portion of the battery cells 122 can form an exhaust channel 120a by surrounding the shell wall of an adjacent battery cell 122.

[0070] Based on this, the battery pack 120 also includes a third explosion-proof valve 123, which can be installed on the wall of the housing 121 and communicate with the first inner cavity 121a. Specifically, the third explosion-proof valve 123 can be one-to-one with and communicate with the exhaust channel 120a, and one third explosion-proof valve 123 can also be connected to multiple exhaust channels 120a.

[0071] In summary, the battery cell 122 provided in this application is configured such that the first shell wall 11 and the second shell wall 12 are arranged opposite to each other, the third shell wall 13 and the fourth shell wall 14 are connected, and the fifth shell wall 15 and the sixth shell wall 16 are connected. The third shell wall 13 is connected between the fourth shell wall 14 and the first shell wall 11, and the fourth shell wall 14 is connected between the second shell wall 12 and the third shell wall 13. The third shell wall 13 is located on the side of the first shell wall 11 and the fourth shell wall 14 facing the inner cavity of the housing 10, and the fifth shell wall 15 is connected to... Between the sixth shell wall 16 and the first shell wall 11, the sixth shell wall 16 is connected between the second shell wall 12 and the fifth shell wall 15, and the fifth shell wall 15 is located on the side of the sixth shell wall 16 and the first shell wall 11 facing the inner cavity of the housing 10, so that when the battery cell 122 is assembled in the box 121, the third shell wall 13 and the fifth shell wall 15 of the battery cell 122 can form an exhaust channel 120a with a large flow area with the box wall of the box 121 and / or the housing 10 of the adjacent battery cell 122.

[0072] Based on this, by setting the first explosion-proof valve 40 and the second explosion-proof valve 50 on the third shell wall 13 and the fifth shell wall 15 respectively, when the internal pressure of the battery cell 122 increases, the first explosion-proof valve 40 and the second explosion-proof valve 50 can release gas into the exhaust channel 120a, and then quickly discharge it outside the battery pack 120, thereby reducing the risk of thermal runaway of the battery pack 120 and ensuring the safety and reliability of the battery pack 120.

[0073] Furthermore, by setting the terminal post 30 on the fourth shell wall 14 and / or the sixth shell wall 16, when the battery cell is assembled into the housing, the first shell wall can contact the upper shell wall of the housing, which can increase the height of the battery cell in the first direction and thus increase the capacity of the battery cell. It can also support the upper shell wall and improve the overall strength of the battery pack.

[0074] Please continue reading. Figures 4-6 The terminal post 30 includes a positive terminal post 31 and a negative terminal post 32. The positive terminal post 31 and the negative terminal post 32 are spaced apart on the fourth shell wall 14. One end of the positive terminal post 31 located within the inner cavity of the shell 10 can be electrically connected to the positive electrode plate via a tab, and one end of the negative terminal post 32 located within the inner cavity of the shell 10 can be electrically connected to the negative electrode plate via a tab. In this way, the terminal posts 30 are located on the same shell wall, making the electrical connection structure between the terminal posts 30 and the electrode assembly 20 more compact, and also making the electrical connection between different battery cells 122 more compact, reducing the design and manufacturing difficulty of the battery cells 122, as well as the design and assembly difficulty of the battery pack 120.

[0075] Based on this, the positive electrode post 31 and the negative electrode post 32 are arranged along the length of the fourth shell wall 14. The ratio of the center distance D between the positive electrode post 31 and the negative electrode post 32 to the length h of the fourth shell wall 14 is greater than or equal to 0.55 and less than or equal to 0.9, i.e., 0.55 ≤ D / h ≤ 0.9. For example, the ratio of D to h can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, etc. This ensures a large distance between the positive electrode post 31 and the negative electrode post 32, and also ensures a large distance between the positive electrode post 31 and the negative electrode post 32 and the edge of the fourth shell wall 14, facilitating the placement of the tabs and other electrical connection structures.

[0076] In some other embodiments, the positive electrode post 31 and the negative electrode post 32 may also be disposed on the sixth shell wall 16 and arranged at intervals along the length of the sixth shell wall 16. The range of the ratio of the center distance between the positive electrode post 31 and the negative electrode post 32 to the length of the sixth shell wall 16 can be referred to the aforementioned ratio of D to L, and will not be repeated here.

[0077] Based on the above, along the first direction, the ratio of the height B of the third shell wall 13 to the distance H between the first shell wall 11 and the second shell wall 12 is greater than or equal to 0.08 and less than or equal to 0.38, i.e., 0.08 ≤ B / H ≤ 0.38. For example, the ratio of B to H can be 0.08, 0.1, 0.13, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.34, 0.38, etc. Along the first direction, the range of values ​​for the ratio of the height B2 of the fifth shell wall 15 to the distance H between the first shell wall 11 and the second shell wall 12 can be referenced from the aforementioned range of values ​​for the ratio of B to H, and will not be repeated here; the ratio of B2 to H can be the same as or different from the ratio of B to H.

[0078] This design ensures that the flow area of ​​the exhaust channel 120a formed by the third shell wall 13 and the fifth shell wall 15, the casing wall of the housing 121, and / or the casing 10 of the adjacent battery cell 122 is as large as possible. It also ensures that the areas of the third shell wall 13 and the fifth shell wall 15 are as large as possible to facilitate the installation of the first explosion-proof valve 40 and the second explosion-proof valve 50, which have larger venting areas. Furthermore, it ensures that the volume of the inner cavity of the casing 10 is as large as possible to increase the size of the electrode assembly 20, ensure the capacity of the battery cell 122, and reserve sufficient space for the installation of the terminal post 30.

[0079] Please continue reading. Figures 4-6 The outer surface of the third shell wall 13 can be a continuous smooth curved surface; from the fourth shell wall 14 to the first shell wall 11, the third shell wall 13 extends in a direction that gradually moves away from the fourth shell wall 14 and gradually moves away from the second shell wall 12. Figures 4-6 In the illustrated embodiment, the third shell wall 13 is generally flat, meaning its outer surface is a curved surface with zero curvature. In other embodiments, the third shell wall 13 may also be an arc-shaped plate. This allows for a larger flow area in the aforementioned exhaust channel 120a while maintaining the volume of the housing cavity 10a for the battery cell 122, thereby ensuring the capacity of the battery cell 122. It also simplifies the design and assembly of the casing 10.

[0080] In some other embodiments, the third shell wall 13 may first extend towards the second shell wall 12 and away from the fourth shell wall 14, and then extend away from both the second shell wall 12 and the fourth shell wall 14. In still other embodiments, the third shell wall 13 may first extend in a direction parallel to the first shell wall 11, and then extend in a direction parallel to the fourth shell wall 14. The shape of the fifth shell wall 15 can refer to the shape of the third shell wall 13, and will not be described further here.

[0081] Please continue reading. Figures 4-6The third shell wall 13 is parallel to the second direction. This further simplifies the design and manufacturing difficulty of the shell 10. In addition, when a row of battery cells 122 includes multiple battery cells 122, the third shell wall 13 of the row of battery cells 122 participates in the formation of the exhaust channel 120a, and the flow area is consistent at all points, ensuring the overall exhaust efficiency of the battery pack 120.

[0082] In some other embodiments, the third shell wall 13 may also intersect the second direction, with the included angle between them being less than 90°. The fifth shell wall 15 may or may not be parallel to the second direction.

[0083] Please continue reading. Figures 4-6 The angle θ between the plane containing the fourth shell wall 14 and the third shell wall 13 can be greater than or equal to 30° and less than or equal to 75°, i.e., 30°≤θ≤75°. For example, the angle θ between the plane containing the fourth shell wall 14 and the third shell wall 13 can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, etc. In this way, with a fixed area of ​​the third shell wall 13, the flow area of ​​the exhaust channel 120a can be maximized to ensure the exhaust efficiency of the battery pack 120, thereby ensuring the safety and reliability of the battery pack 120.

[0084] The range of the angle θ2 between the plane containing the sixth shell wall 16 and the fifth shell wall 15 can be referred to the range of the aforementioned θ values, and will not be repeated here. θ2 and θ can be the same or different.

[0085] The extension length C of the third shell wall 13, from the fourth shell wall 14 to the first shell wall 11, is greater than or equal to 8 mm and less than or equal to 85 mm, i.e., 8 mm ≤ C ≤ 85 mm. For example, the extension length C of the third shell wall 13 can be 8 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, etc. Specifically, the value of C can be selected according to the overall size and capacity of the battery cell 122. Generally, the larger the overall size or capacity of the battery cell 122, the larger the value of C can be.

[0086] The range of values ​​for the extension length C2 from the sixth shell wall 16 to the first shell wall 11 and the fifth shell wall 15 can be referenced from the range of values ​​for C mentioned above, and will not be repeated here. C2 can be the same as or different from C.

[0087] In this way, with the thickness of the battery cell 122 along the second direction being constant, the areas of the third shell wall 13 and the fifth shell wall 15 can be made larger so that the first explosion-proof valve 40 and the second explosion-proof valve 50 of appropriate size can be selected to ensure the discharge efficiency. It can also prevent the areas of the third shell wall 13 and the fifth shell wall 15 from being too large and affecting the volume of the battery cell 122.

[0088] Please continue reading. Figures 4-6 The ratio of the length A of the first shell wall 11 along a third direction to the length L of the fourth shell wall 14 and the sixth shell wall 16 along a third direction is greater than or equal to 0.55 and less than or equal to 0.95, i.e., 0.55 ≤ A / L ≤ 0.95. For example, the ratio of A to L can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.95, etc. In this way, while ensuring the flow area of ​​the aforementioned exhaust channel 120a, it is also possible to ensure that the length A of the first shell wall 11 is as large as possible to ensure the volume of the receiving cavity 10a, thereby ensuring the capacity of the battery cell 122. In addition, while the battery cell 122 is fixed to the housing 121 through the first shell wall 11, the connection area and heat dissipation area between the battery cell 122 and the housing 121 are ensured, thereby ensuring the reliability and safety of the connection between the battery cell 122 and the housing 121.

[0089] Based on the above, please continue to refer to... Figures 4-6 The fourth shell wall 14 has an injection hole 11a, which is used to inject electrolyte into the inner cavity of the shell 10 during the assembly of the battery cell 122. The center distance P between the injection hole 11a and the positive electrode post 31 is less than the distance Q between the injection hole 11a and the negative electrode post 32, i.e., P < Q. This helps to prevent electrolyte leakage and external conduction between the battery cell 122 and the outside, further improving the safety of the battery cell 122 in use.

[0090] Figures 4-6 In the illustrated embodiment, the injection port 11a is located between the positive electrode post 31 and the negative electrode post 32. In some other embodiments, the injection port 11a may also be located on the side of the positive electrode post 31 away from the negative electrode post 32.

[0091] Please see Figure 7 and Figure 8 , Figure 7 This is a perspective structural diagram of a battery cell 122 provided in some embodiments of this application. Figure 8 for Figure 7 The front view of the battery cell 122 shown. Figure 7 and Figure 8 The illustrated embodiments and Figures 4-6The difference in the embodiment shown is that the positive terminal 31 and the negative terminal 32 are respectively disposed on the fourth shell wall 14 and the sixth shell wall 16.

[0092] In this way, the positive terminal 31 can be located further away from the first explosion-proof valve 40, and the negative terminal 32 can be located further away from the second explosion-proof valve 50, which can prevent the high-temperature gases discharged from the first and second explosion-proof valves 40 and 50 from affecting the reliability of the electrical connection at the positive terminal 31 and the negative terminal 32. Furthermore, it also prevents the difficulty in arranging the positive terminal 31, the negative terminal 32, and the tabs when the ratio of B or B2 to H is large. Finally, the liquid injection hole 11a and the negative terminal 32 are located on two shell walls, further improving the safety of the battery cell 122 in use.

[0093] Please see Figure 9 and Figure 10 , Figure 9 This is a perspective structural diagram of a battery cell 122 provided in some embodiments of this application. Figure 10 for Figure 9 The front view of the battery cell 122 shown. Figure 9 The illustrated embodiments and Figures 4-6 The difference in the illustrated embodiment is that the housing 10 does not include the fifth housing wall 15, and the two ends of the sixth housing wall 16 are respectively connected to the first housing wall 11 and the second housing wall 12. Based on this, the battery cell 122 does not include the second explosion-proof valve 50. Thus, when the size or volume of the battery cell 122 is small, the discharge requirements can be met by providing the first explosion-proof valve 40. In this way, the volume of the battery cell 122 can be larger, thereby improving the battery life of the electrical device 100.

[0094] In this case, when the battery cell 122 is assembled inside the housing 121, an exhaust channel 120a is formed only between the third shell wall 13 of the battery cell 122 and the housing wall of the housing 121 and / or the housing 10 of the adjacent battery cell 122.

[0095] Please see Figure 11 and Figure 12 , Figure 11 This is a perspective structural diagram of a battery cell 122 provided in some embodiments of this application. Figure 12 for Figure 11 The front view of the battery cell 122 shown. Figure 11 and Figure 12 The illustrated embodiments and Figure 7 and Figure 8The difference in the illustrated embodiment is that the housing 10 does not include the fifth housing wall 15, and the two ends of the sixth housing wall 16 are respectively connected to the first housing wall 11 and the second housing wall 12. Based on this, the battery cell 122 does not include the second explosion-proof valve 50. Thus, when the size or volume of the battery cell 122 is small, the discharge requirements can be met by providing the first explosion-proof valve 40. In this way, the volume of the battery cell 122 can be larger, thereby improving the battery life of the electrical device 100.

[0096] In this case, when the battery cell 122 is assembled inside the housing 121, an exhaust channel 120a is formed only between the third shell wall 13 of the battery cell 122 and the housing wall of the housing 121 and / or the housing 10 of the adjacent battery cell 122.

[0097] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: A housing includes a first shell wall and a second shell wall disposed opposite to each other, a third shell wall and a fourth shell wall joined together, and a fifth shell wall and a sixth shell wall joined together; one end of the third shell wall away from the fourth shell wall is connected to the first shell wall, and one end of the fourth shell wall away from the third shell wall is connected to the second shell wall; one end of the fifth shell wall away from the sixth shell wall is connected to the first shell wall, and one end of the sixth shell wall away from the fifth shell wall is connected to the second shell wall; the third shell wall is located on the side of the first shell wall facing the inner cavity of the housing, and on the side of the fourth shell wall facing the inner cavity of the housing; the fifth shell wall is located on the side of the first shell wall facing the inner cavity of the housing, and on the side of the sixth shell wall facing the inner cavity of the housing. A pole post, wherein the pole post is disposed on the fourth shell wall and / or the sixth shell wall; The first explosion-proof valve is disposed on the third shell wall and communicates with the inner cavity of the shell; The second explosion-proof valve is disposed on the fifth shell wall and communicates with the inner cavity of the shell.

2. The battery cell according to claim 1, characterized in that, The electrode post includes a positive electrode post and a negative electrode post; the positive electrode post and the negative electrode post are disposed at intervals on the fourth shell wall.

3. The battery cell according to claim 2, characterized in that, The positive and negative electrode posts are arranged along the length of the fourth shell wall; the center distance D between the positive and negative electrode posts satisfies the following condition with respect to the length h of the fourth shell wall: 0.55 ≤ D / h ≤ 0.90; and / or, The fourth shell wall also has a liquid injection hole, and the distance between the liquid injection hole and the positive electrode post is less than the distance between the liquid injection hole and the negative electrode post.

4. The battery cell according to claim 1, characterized in that, The electrode post includes a positive electrode post and a negative electrode post; the positive electrode post and the negative electrode post are respectively disposed on the fourth shell wall and the sixth shell wall.

5. The battery cell according to any one of claims 1-4, characterized in that, The angle θ between the plane containing the fourth shell wall and the third shell wall satisfies: 30° ≤ θ ≤ 75°; and / or, The angle θ2 between the plane containing the sixth shell wall and the fifth shell wall satisfies: 30°≤θ2≤75°.

6. The battery cell according to any one of claims 1-4, characterized in that, The extension length C of the third shell wall from the fourth shell wall to the first shell wall satisfies: 8mm ≤ C ≤ 85mm; and / or, The extension length C2 of the fifth shell wall from the sixth shell wall to the first shell wall satisfies: 8mm ≤ C2 ≤ 85mm.

7. The battery cell according to any one of claims 1-4, characterized in that, Along the first direction, the height B of the third shell wall and the distance H between the first shell wall and the second shell wall satisfy: 0.08 ≤ B / H ≤ 0.38; and / or, Along the first direction, the height B2 of the fifth shell wall and the distance H between the first shell wall and the second shell wall satisfy: 0.08≤B2 / H≤0.38; Wherein, the first direction is the arrangement direction of the first shell wall and the second shell wall.

8. A single battery cell, characterized in that, include: The housing includes a first shell wall and a second shell wall disposed opposite to each other, a third shell wall and a fourth shell wall connected to each other, and a sixth shell wall; The end of the third shell wall away from the fourth shell wall is connected to the first shell wall, and the end of the fourth shell wall away from the third shell wall is connected to the second shell wall; the third shell wall is located on the side of the first shell wall facing the inner cavity of the shell, and on the side of the fourth shell wall facing the inner cavity of the shell; the two ends of the sixth shell wall are respectively connected to the first shell wall and the second shell wall. A positive electrode post and a negative electrode post, wherein one of the positive electrode post and the negative electrode post is disposed on the fourth shell wall and the other is disposed on the sixth shell wall; The first explosion-proof valve is disposed on the third shell wall and communicates with the inner cavity of the shell.

9. A battery pack, characterized in that, include: Box; A battery cell, wherein the battery cell is disposed in the housing, the battery cell being any one of claims 1-8, wherein at least the third shell wall of one of the battery cells is arranged with the housing wall of the housing and / or the shell of the adjacent battery cell to form an exhaust channel; The third explosion-proof valve is installed on the wall of the enclosure and is connected to the exhaust channel.

10. An electrical appliance, characterized in that, include: Electricity-consuming entities; The battery pack is the battery pack according to claim 9, and the battery pack is electrically connected to the power-consuming body.

Images