Battery cell and battery module

Abstract

The application discloses a battery monomer and a battery module. The battery monomer comprises a shell, an electric core and an electrode assembly. The shell has a containing space; the electric core is arranged in the containing space; the electrode assembly is arranged on the shell and electrically connected with the electric core; wherein, the shell is provided with a mounting groove for mounting a pressure relief channel piece; the groove bottom of the mounting groove has a mounting surface; the mounting surface is provided with an explosion-proof valve; the gas generated in the shell can enter the pressure relief channel piece through the explosion-proof valve and be discharged. The battery monomer and the battery module can not only improve the heat dissipation efficiency, but also orderly discharge the high-temperature gas, avoid the gas gathering and disordered movement in the battery module, realize the heat-electricity separation, and thus avoid the damage of the high-temperature gas to the electrical elements in the battery module as much as possible.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and a battery module. Background Technology

[0002] With the rapid development of new energy vehicles, fast charging technology has become an important research direction in the industry. Under high-rate charging conditions, the battery cell generates a large amount of heat. If this heat cannot be dissipated in time, it will cause the battery temperature to rise sharply, potentially even leading to thermal runaway. During thermal runaway, the irregular movement of high-temperature gas within the battery pack can cause problems such as high-voltage insulation damage, component melting, and heat accumulation.

[0003] In existing technologies, battery heat dissipation solutions include dual-surface cooling and immersion cooling. However, these solutions cannot effectively expel high-temperature gases in an orderly manner during thermal runaway, making it difficult to avoid damage to electrical components inside the battery pack caused by high-temperature gases. Utility Model Content

[0004] This application provides a battery cell and a battery module that not only improve heat dissipation efficiency but also orderly discharge high-temperature gas, thereby minimizing the damage of high-temperature gas to electrical components inside the battery pack.

[0005] This application provides a single battery cell, comprising:

[0006] A housing having a receiving space;

[0007] A battery cell, wherein the battery cell is disposed within the receiving space;

[0008] An electrode assembly, wherein the electrode assembly is disposed in the housing and electrically connected to the battery cell;

[0009] The housing is provided with a mounting groove for installing a pressure relief channel component. The bottom of the mounting groove has a mounting surface, and an explosion-proof valve is provided on the mounting surface. Gas generated inside the housing can enter the pressure relief channel component through the explosion-proof valve and be discharged.

[0010] In some embodiments, the mounting groove is formed by a recess in the outer surface of the housing toward the receiving space, and the depth of the mounting groove is greater than or equal to the thickness of the pressure relief channel member, so that when the pressure relief channel member is installed in the mounting groove, the side of the pressure relief channel member away from the mounting surface is flush with or lower than the outer surface of the housing around the mounting groove.

[0011] The depth of the mounting groove is the vertical distance from the mounting surface of the mounting groove to the outer surface of the housing around the mounting groove.

[0012] In some embodiments, the mounting groove extends through a local area of ​​the housing along the thickness direction of the battery cell to form the mounting groove.

[0013] In some embodiments, the battery cell is recessed at the position corresponding to the mounting groove to form the mounting groove.

[0014] In some embodiments, the housing has a top surface and a bottom surface disposed opposite to each other, and a side surface connecting the top surface and the bottom surface, wherein the mounting groove is disposed in at least one of the top surface, the bottom surface and the side surface.

[0015] In some embodiments, the side surface includes at least two opposing sides, and the mounting groove is disposed on any one or more of the sides.

[0016] In some embodiments, the housing includes a main body and a top cover, the top cover being disposed on the top of the main body and recessed at a position corresponding to the mounting groove.

[0017] In some embodiments, the electrode assembly includes a positive electrode assembly and a negative electrode assembly;

[0018] The positive electrode assembly includes a positive electrode post, a positive electrode insulating sleeve, a positive electrode sealing ring, a positive electrode adapter piece, and a positive electrode tab. One end of the positive electrode post is exposed on the surface of the housing, and the other end of the positive electrode post is disposed within the receiving space and electrically connected to the positive electrode tab through the positive electrode adapter piece. The positive electrode insulating sleeve is disposed between the positive electrode post and the housing to electrically isolate the positive electrode post and the housing from each other. The positive electrode sealing ring is disposed between the positive electrode post and the positive electrode insulating sleeve and is used to seal the gap between the positive electrode post and the housing.

[0019] The negative electrode assembly includes a negative electrode post, a negative electrode insulating sleeve, a negative electrode sealing ring, a negative electrode adapter piece, and a negative electrode ear. One end of the negative electrode post is exposed on the surface of the housing, and the other end of the negative electrode post is disposed within the receiving space and electrically connected to the negative electrode ear through the negative electrode adapter piece. The negative electrode insulating sleeve is disposed between the negative electrode post and the housing to electrically isolate the negative electrode post and the housing from each other. The negative electrode sealing ring is disposed between the negative electrode post and the negative electrode insulating sleeve and is used to seal the gap between the negative electrode post and the housing.

[0020] A battery module includes a plurality of battery cells as described in any one of the above descriptions, and at least one pressure relief channel, the pressure relief channel being installed in the mounting groove and communicating with the corresponding explosion-proof valve.

[0021] In some embodiments, the pressure relief channel component is provided with a pressure relief hole and a vent hole, the explosion-proof valve is provided in a one-to-one correspondence with the pressure relief hole, the pressure relief hole is connected to the vent hole, and the vent hole is connected to the external environment, so that the gas generated in the housing is discharged to the outside through the explosion-proof valve, the pressure relief hole and the vent hole in sequence.

[0022] Beneficial effects: Compared with the prior art, the battery cells and battery modules provided in this application embodiment, by setting an installation groove on the battery cell, the installation groove is used to install a pressure relief channel component. The bottom of the installation groove has an installation surface, and an explosion-proof valve is set on the installation surface. Gas generated inside the housing can enter the pressure relief channel component through the explosion-proof valve and be discharged. This not only improves the heat dissipation efficiency of the battery cells and battery modules, but also allows high-temperature gas to be discharged in an orderly manner, avoiding gas accumulation and disordered movement in the battery pack. It can achieve heat-electric separation, thereby minimizing the damage of high-temperature gas to electrical components inside the battery pack. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an exploded structural diagram of the battery module of this application;

[0025] Figure 2 This is a structural schematic diagram of the pressure relief channel component of this application;

[0026] Figure 3 This is a schematic diagram of the structure of a single battery cell in this application;

[0027] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell in this application;

[0028] Figure 5 This is a structural diagram showing the installation slot being installed on the top surface of the housing;

[0029] Figure 6 This is a structural diagram showing the installation slot located on the bottom surface of the housing;

[0030] Figure 7 This is a structural diagram showing the installation slot located on one side of the housing.

[0031] Figure 8 This is a structural diagram showing the installation slot located on the other side of the housing.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Battery cell; 1. Casing; 11. Housing space; 12. Top surface; 13. Bottom surface; 14. Side surface; 15. Main body; 16. Top cover; 161. Identification code; 17. Upper bracket; 18. Top cover patch; 2. Battery cell; 3. Electrode assembly; 31. Positive electrode assembly; 311. Positive electrode post; 312. Positive electrode insulating sleeve; 313. Positive electrode sealing ring; 314. Positive electrode adapter; 315. Positive electrode tab; 32. Negative electrode assembly. 321, negative terminal post; 3211, first negative terminal post; 3212, second negative terminal post; 322, negative terminal insulating sleeve; 323, negative terminal sealing ring; 324, negative terminal adapter piece; 325, negative terminal lug; 4, mounting groove; 41, mounting surface; 5, explosion-proof valve; 51, explosion-proof valve patch; 200, pressure relief channel component; 210, pressure relief hole; 220, vent hole; X, length direction; Y, thickness direction; Z, width direction. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0035] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] This application provides a battery cell and a battery module, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0037] Reference Figure 1One embodiment of this application provides a battery module including multiple battery cells 100 and at least one pressure relief channel 200. The pressure relief channel 200 is installed in a mounting slot 4 and communicates with a corresponding explosion-proof valve 5. The pressure relief channel 200 is used to discharge the gas generated by the battery cells 100 to the outside, preventing the gas from accumulating and moving randomly in the battery pack. It can achieve thermal-electrical separation, that is, the explosion-proof valve 5 and the pressure relief channel 200 allow the high-temperature gas to be discharged quickly, achieving rapid separation of the high-temperature gas from the battery cells, thereby minimizing the damage of the high-temperature gas to the electrical components inside the battery pack. The pressure relief channel 200 can be installed on multiple battery cells 100, that is, multiple battery cells 100 share one pressure relief channel 200. In some embodiments, each battery cell 100 can be provided with one pressure relief channel 200.

[0038] Reference Figure 1 and Figure 2 The pressure relief channel component 200 is provided with a pressure relief hole 210 and a vent hole 220. Preferably, there are multiple pressure relief holes 210, and multiple explosion-proof valves 5 are respectively provided with one-to-one correspondence between the multiple pressure relief holes 210 and the multiple vent holes 220. The pressure relief holes 210 are connected to the vent holes 220, and the vent holes 220 are connected to the external environment, so that the gas generated in the housing 1 can be discharged to the outside environment in sequence through the explosion-proof valves 5, the pressure relief holes 210 and the vent holes 220.

[0039] When a single battery cell 100 experiences thermal runaway, the temperature and pressure inside the casing 1 rise sharply. When the pressure reaches the opening pressure of the explosion-proof valve 5, the explosion-proof valve 5 opens, and the high-temperature gas enters the corresponding pressure relief port 210 through the explosion-proof valve 5. Then, it flows along the pressure relief channel component 200 and is finally discharged from the battery pack through the vent port 220. Because the pressure relief channel component 200 is installed in the mounting groove 4, the high-temperature gas will not diffuse disorderly inside the battery pack, but will be discharged through the preset pressure relief channel, achieving thermal-electrical separation and minimizing damage to the electrical components inside the battery pack caused by the high-temperature gas, such as high-voltage insulation damage or component melting.

[0040] Please refer to the details as well. Figure 3 and Figure 4 The battery cell 100 includes: a housing 1, a battery cell 2, and an electrode assembly 3. The battery cell 2 is disposed inside the housing 1, and the electrode assembly 3 is disposed in the housing 1 and electrically connected to the battery cell 2.

[0041] The housing 1 has a receiving space 11, and the battery cell 2 is disposed within the receiving space 11. The housing 1 can be in the shape of a cuboid, cylinder, or other shapes. In this embodiment, the housing 1 is in the shape of a cuboid, so that the battery cell 100 is also in the shape of a cuboid. The material of the housing 1 is, for example, aluminum, to ensure that the housing 1 has sufficient structural strength. At the same time, aluminum has good thermal conductivity, which is beneficial to the heat dissipation of the battery cell 100.

[0042] The shape of the cell 2 can be matched with the shape of the casing 1 to increase the proportion of the space occupied by the cell 2 in the housing 11, thereby improving the space utilization of the casing 1 and thus increasing the energy density of the battery cell 100.

[0043] One end of the electrode assembly 3 is disposed within the receiving space 11 and electrically connected to the battery cell 2, while the other end of the electrode assembly 3 is disposed outside the receiving space 11, so that the electrode assembly 3 can be electrically connected to other components, thereby enabling the battery cell 2 to be electrically connected to other components.

[0044] Among them, reference Figure 1 The housing 1 is provided with a mounting groove 4 for mounting a pressure relief channel component 200. The mounting groove 4 is located on the outer surface of the housing 1. The bottom of the mounting groove 4 has a mounting surface 41, on which an explosion-proof valve 5 is installed. Gas generated inside the housing 1 can enter the pressure relief channel component 200 through the explosion-proof valve 5 and be discharged, ensuring a smooth gas discharge path. (Refer to...) Figure 4 An explosion-proof valve patch 51 is provided on the side of the explosion-proof valve 5 facing away from the accommodating space 11. The explosion-proof valve patch 51 can prevent foreign objects from blocking the explosion-proof valve 5, and can also prevent the explosion-proof valve 5 from being accidentally broken due to external mechanical collisions or misoperation during assembly.

[0045] Reference Figure 1 The shape of the mounting groove 4 corresponds to the shape of the pressure relief channel component 200 to ensure that the pressure relief channel component 200 and the mounting groove 4 can fit tightly. This not only helps to reduce the size of the battery pack, but also prevents gas leakage, thus ensuring that gas can be discharged through the pressure relief channel component 200. As an example, the cross-section of the pressure relief channel component 200 is trapezoidal, and the cross-section of the mounting groove 4 is also trapezoidal.

[0046] In this application, by providing an installation groove 4 on the battery cell 100, the installation groove 4 is used to install the pressure relief channel component 200. The bottom of the installation groove 4 has an installation surface 41, and the explosion-proof valve 5 is provided on the installation surface 41. Gas generated inside the housing 1 can enter the pressure relief channel component 200 through the explosion-proof valve 5 and be discharged. This not only improves the heat dissipation efficiency of the battery cell 100 and the battery module, but also allows the high-temperature gas to be discharged in an orderly manner, avoiding the accumulation and disorderly movement of gas in the battery pack. This can achieve heat-electric separation, thereby minimizing the damage of high-temperature gas to the electrical components inside the battery pack.

[0047] In one specific embodiment, the mounting groove 4 can be formed by protruding from the outer surface of the housing 1 in the direction away from the receiving space 11, or the mounting groove 4 can be formed by recessing from the outer surface of the housing 1 in the direction of the receiving space 11. In this embodiment, referring to... Figure 3 and Figure 4The mounting groove 4 is formed by a recess in the outer surface of the housing 1 towards the receiving space 11. This does not increase the overall volume of the battery cell 100, and when the pressure relief channel 200 is installed in the mounting groove 4, it does not additionally increase the volume of the battery pack. The positions of the battery cell 2 and the mounting groove 4 are recessed to form the mounting groove 4. That is, only the positions of the battery cell 2 and the mounting groove 4 are recessed to ensure the energy density of the battery cell 100.

[0048] As a preferred embodiment, the depth of the mounting groove 4 is greater than or equal to the thickness of the pressure relief channel component 200. This ensures that when the pressure relief channel component 200 is installed in the mounting groove 4, the side of the pressure relief channel component 200 away from the mounting surface 41 is flush with or lower than the outer surface of the housing 1 surrounding the mounting groove 4. This ensures that the pressure relief channel component 200 does not additionally increase the overall thickness of the battery cell 100 after installation, which is beneficial for the compact layout of the battery pack and improving energy density, and also prevents interference with other components. The depth of the mounting groove 4 is the vertical distance from the mounting surface 41 of the mounting groove 4 to the outer surface of the housing 1 surrounding the mounting groove 4. In this embodiment, the depth of the mounting groove 4 is equal to or approximately equal to the thickness of the pressure relief channel component 200. When the pressure relief channel component 200 is installed in the mounting groove 4, the side of the pressure relief channel component 200 away from the mounting surface 41 is flush or approximately flush with the outer surface of the housing 1 on the periphery of the mounting groove 4. This not only does not increase the volume of the battery pack, but also maximizes the energy density of the battery cell 100, while also ensuring the stability of the position of the pressure relief channel component 200.

[0049] Reference Figure 3 and Figure 4 The housing 1 has a top surface 12 and a bottom surface 13 disposed opposite to each other, and a side surface 14 connecting the top surface 12 and the bottom surface 13. A mounting groove 4 is provided in at least one of the top surface 12, the bottom surface 13, and the side surface 14. This allows for adaptation to different battery pack design requirements, enabling the selection of the optimal pressure relief location based on the actual layout, thereby improving the safety and reliability of the battery pack. The top surface 12 and the bottom surface 13 are two surfaces in the width direction Z of the battery cell 100.

[0050] Reference Figure 3 and Figure 4 The side 14 may include at least two oppositely arranged side 14s, and the mounting groove 4 is disposed on any one or more side 14s. In this embodiment, the overall shape of the housing 1 is cuboid, and the number of side 14s is four. The four side 14s may include two faces in the length direction X of the battery cell 100 and two faces in the thickness direction Y of the battery cell 100.

[0051] Reference Figure 1Since the thickness of the battery cell 100 is smaller than its length and width, when multiple battery cells 100 are arranged in a straight line to form a battery pack, they can be arranged sequentially along the thickness direction Y of the battery cell 100, allowing for a more compact arrangement. The mounting groove 4 penetrates a local area of ​​the housing 1 along the thickness direction Y of the battery cell 100 to form the mounting groove 4. When multiple battery cells 100 are arranged sequentially along the thickness direction Y, the mounting grooves 4 on adjacent battery cells 100 are interconnected to facilitate the installation of the pressure relief channel component 200.

[0052] Reference Figures 5 to 8 The mounting groove 4 can be provided on at least one of the top surface 12, the bottom surface 13, and the two side surfaces 14 along the length direction X of the battery cell 100. Specifically, the mounting groove 4 is provided on the top surface 12 (e.g., Figure 5 As shown), the mounting slot 4 is located on the bottom surface 13 (as shown). Figure 6 As shown), the mounting groove 4 is provided on one of the sides 14 of the battery cell 100 in the length direction X (e.g. Figure 7 As shown), the mounting groove 4 is located on another side 14 in the length direction X of the battery cell 100 (as shown). Figure 8 (As shown). In this way, the mounting groove 4 can penetrate a local area of ​​the housing 1 along the thickness direction Y of the battery cell 100, which can reduce the volume of the mounting groove 4, thereby increasing the volume of the cell 2 and thus improving the energy density of the battery cell 100. At the same time, it can also shorten the size of the pressure relief channel 200 so that the gas can be discharged more promptly through the pressure relief channel 200.

[0053] As an example, refer to Figure 3 and Figure 4 The housing 1 may include a main body 15 and a top cover 16. The top cover 16 is disposed on top of the main body 15. The main body 15 forms the bottom surface 13 and side surfaces 14 of the housing 1, and the top surface serves as the top surface 12 of the housing 1. The main body 15 and the top cover 16 enclose a receiving space 11. The top cover 16 is recessed at a position corresponding to the mounting groove 4, i.e., the mounting groove 4 is disposed on the top surface 12 of the housing 1. An identification code 161 may also be provided on the housing 1. In this embodiment, the identification code 161 is disposed on the top cover 16, and the identification code 161 may be, for example, a QR code. The identification code 161 can serve as an information carrier to achieve traceability of information about the battery cell 100.

[0054] In one specific implementation, refer to Figure 3 and Figure 4The electrode assembly 3 may include a positive electrode assembly 31 and a negative electrode assembly 32, which are electrically connected to the battery cell 2. As an example, the positive electrode assembly 31 and the negative electrode assembly 32 are disposed on the top surface 12 of the housing 1, that is, the positive electrode assembly 31 and the negative electrode assembly 32 are disposed on the top cover 16, and in the length direction X of the battery cell 100, the positive electrode assembly 31 and the negative electrode assembly 32 are respectively located on both sides of the mounting groove 4.

[0055] Specifically, refer to Figure 4 The positive electrode assembly 31 may include a positive electrode post 311, a positive electrode insulating sleeve 312, a positive electrode sealing ring 313, a positive electrode adapter 314, and a positive electrode tab 315. One end of the positive electrode post 311 is exposed on the surface of the housing 1, i.e., one end of the positive electrode post 311 is exposed on the top cover 16, for external electrical connection. The other end of the positive electrode post 311 is disposed within the receiving space 11 and is electrically connected to the positive electrode tab 315 through the positive electrode adapter 314. The positive electrode insulating sleeve 312 is disposed between the positive electrode post 311 and the housing 1 to electrically isolate the positive electrode post 311 from the housing 1, thereby preventing short circuit between the positive electrode post 311 and the housing 1. The positive electrode sealing ring 313 is disposed between the positive electrode post 311 and the positive electrode insulating sleeve 312, and is used to seal the gap between the positive electrode post 311 and the housing 1 to prevent electrolyte leakage.

[0056] Reference Figure 4 The negative electrode assembly 32 includes a negative electrode post 321, a negative electrode insulating sleeve 322, a negative electrode sealing ring 323, a negative electrode adapter piece 324, and a negative electrode ear 325. One end of the negative electrode post 321 is exposed on the surface of the housing 1, i.e., one end of the negative electrode post 321 is exposed on the top cover 16, for external electrical connection. The other end of the negative electrode post 321 is disposed within the receiving space 11 and is electrically connected to the negative electrode ear 325 through the negative electrode adapter piece 324. The negative electrode insulating sleeve 322 is disposed between the negative electrode post 321 and the housing 1 to electrically isolate the negative electrode post 321 from the housing 1, thereby preventing short circuit between the negative electrode post 321 and the housing 1. The negative electrode sealing ring 323 is disposed between the negative electrode post 321 and the negative electrode insulating sleeve 322, and is used to seal the gap between the negative electrode post 321 and the housing 1 to prevent electrolyte leakage. The negative electrode post 321 adopts an Al-Cu composite structure. The negative electrode post 321 includes a first negative electrode post 3211 and a second negative electrode post 3212. The first negative electrode post 3211 is made of aluminum and the second negative electrode post 3212 is made of copper. That is, the negative electrode post 321 is made of copper and aluminum through welding, which facilitates the welding of the negative electrode post 321 to other components and improves the reliability of the connection.

[0057] Reference Figure 4An upper bracket 17 is provided between the top cover 16 and the positive electrode adapter 314 and the negative electrode adapter 324. The upper bracket 17 can not only assist in the installation of the positive electrode adapter 314 and the negative electrode adapter 324, but also provide support for the battery cell 2 to prevent the battery cell 2 from shifting due to expansion or vibration during charging and discharging.

[0058] Reference Figure 4 A top cover patch 18 is provided on the side of the top cover 16 facing away from the receiving space 11, and the top cover patch 18 covers the surface of the top cover 16. The top cover patch 18 is made of insulating material, for example, and not only protects the top cover 16, but also has an insulating function to prevent the metal top cover 16 from short-circuiting with other components.

[0059] The above provides a detailed description of a battery cell and a battery module provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery cell, characterized in that, include: A housing (1) having a receiving space (11); Battery cell (2), wherein the battery cell (2) is disposed within the accommodating space (11); Electrode assembly (3), the electrode assembly (3) is disposed in the housing (1) and electrically connected to the battery cell (2); The housing (1) is provided with a mounting groove (4) for installing a pressure relief channel component (200). The bottom of the mounting groove (4) has a mounting surface (41) and an explosion-proof valve (5) is provided on the mounting surface (41). Gas generated inside the housing (1) can enter the pressure relief channel component (200) through the explosion-proof valve (5) and be discharged.

2. The battery cell according to claim 1, characterized in that, The mounting groove (4) is formed by recessing the outer surface of the housing (1) toward the receiving space (11). The depth of the mounting groove (4) is greater than or equal to the thickness of the pressure relief channel (200) so that when the pressure relief channel (200) is installed in the mounting groove (4), the side of the pressure relief channel (200) away from the mounting surface (41) is flush with or lower than the outer surface of the housing (1) around the mounting groove (4). The depth of the mounting groove (4) is the vertical distance from the mounting surface (41) of the mounting groove (4) to the outer surface of the housing (1) around the mounting groove (4).

3. The battery cell according to claim 1, characterized in that, The mounting groove (4) extends through a local area of ​​the housing (1) along the thickness direction (Y) of the battery cell (100) to form the mounting groove (4).

4. The battery cell according to claim 2, characterized in that, The battery cell (2) is recessed at the position corresponding to the mounting groove (4) to form the mounting groove (4).

5. The battery cell according to claim 1, characterized in that, The housing (1) has a top surface (12) and a bottom surface (13) disposed opposite to each other, and a side surface (14) connecting the top surface (12) and the bottom surface (13), and the mounting groove (4) is disposed in at least one of the top surface (12), the bottom surface (13) and the side surface (14).

6. The battery cell according to claim 5, characterized in that, The side (14) includes at least two oppositely arranged side surfaces (14), and the mounting groove (4) is disposed on any one or more of the side surfaces (14).

7. The battery cell according to claim 2, characterized in that, The housing (1) includes a main body (15) and a top cover (16). The top cover (16) is disposed on the top of the main body (15), and the top cover (16) is recessed at the position corresponding to the mounting groove (4).

8. The battery cell according to claim 1, characterized in that, The electrode assembly (3) includes a positive electrode assembly (31) and a negative electrode assembly (32); The positive electrode assembly (31) includes a positive electrode post (311), a positive electrode insulating sleeve (312), a positive electrode sealing ring (313), a positive electrode adapter (314), and a positive electrode tab (315). One end of the positive electrode post (311) is exposed on the surface of the housing (1), and the other end of the positive electrode post (311) is disposed in the receiving space (11) and electrically connected to the positive electrode tab (315) through the positive electrode adapter (314). The positive electrode insulating sleeve (312) is disposed between the positive electrode post (311) and the housing (1) to electrically isolate the positive electrode post (311) from the housing (1). The positive electrode sealing ring (313) is disposed between the positive electrode post (311) and the positive electrode insulating sleeve (312) and is used to seal the gap between the positive electrode post (311) and the housing (1). The negative electrode assembly (32) includes a negative electrode post (321), a negative electrode insulating sleeve (322), a negative electrode sealing ring (323), a negative electrode adapter piece (324), and a negative electrode ear (325). One end of the negative electrode post (321) is exposed on the surface of the housing (1), and the other end of the negative electrode post (321) is disposed in the receiving space (11) and electrically connected to the negative electrode ear (325) through the negative electrode adapter piece (324). The negative electrode insulating sleeve (322) is disposed between the negative electrode post (321) and the housing (1) to electrically isolate the negative electrode post (321) from the housing (1). The negative electrode sealing ring (323) is disposed between the negative electrode post (321) and the negative electrode insulating sleeve (322) and is used to seal the gap between the negative electrode post (321) and the housing (1).

9. A battery module, characterized in that, It includes a plurality of battery cells (100) as described in any one of claims 1 to 8, and at least one pressure relief channel (200), which is installed in the mounting groove (4) and communicates with the corresponding explosion-proof valve (5).

10. The battery module according to claim 9, characterized in that, The pressure relief channel component (200) is provided with a pressure relief hole (210) and a vent hole (220). The explosion-proof valve (5) is provided in a one-to-one correspondence with the pressure relief hole (210). The pressure relief hole (210) is connected to the vent hole (220). The vent hole (220) is connected to the external environment so that the gas generated in the housing (1) is discharged to the outside through the explosion-proof valve (5), the pressure relief hole (210) and the vent hole (220) in sequence.

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