Secondary battery, battery pack, and electric device

Abstract

The utility model discloses a secondary battery, a battery pack and a power utilization device, the secondary battery comprises a shell, an electrode assembly, a first cover plate, a second cover plate and a pressure relief piece, the shell is provided with a pressure relief hole, a containing cavity and a first through groove, the containing cavity and the first through groove penetrate in the first direction, and the pressure relief hole is communicated with the containing cavity; the electrode assembly is arranged in the accommodating cavity; the first cover plate covers one side of the accommodating cavity and is connected with the shell; the first cover plate is provided with a second through groove penetrating in the first direction, and the second through groove is communicated with the first through groove; the second cover plate covers the side, away from the first cover plate, of the containing cavity and is connected with the shell. The second cover plate is provided with a third through groove penetrating in the first direction, and the third through groove is communicated with the first through groove; and the pressure relief piece is connected with the shell and covers and seals the pressure relief hole. A through three-dimensional heat dissipation path can be formed on the outer surface of the secondary battery, the heat dissipation area is increased, and the heat exchange and dissipation efficiency is effectively improved. In addition, the pressure relief piece is arranged on the shell, so that exhaust and pressure relief are facilitated, and the safety of the secondary battery is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a secondary battery, a battery pack, and an electrical device. Background Technology

[0002] As the energy unit of a power battery pack, secondary batteries are typically stacked within the pack's casing, connected in series and parallel to achieve the desired output power. However, current power battery packs are constantly striving for faster charging efficiency. As fast charging time decreases and efficiency increases, the rate at which secondary batteries heat up also increases. In such cases, the secondary batteries cannot dissipate heat effectively, leading to reduced battery safety. Utility Model Content

[0003] The purpose of this utility model is to provide a secondary battery that addresses the heat dissipation efficiency of existing secondary batteries, which suffers from high heat generation rate. Another purpose of this application is to provide a battery pack, and yet another purpose is to provide an electrical device.

[0004] Technical solution: A secondary battery according to an embodiment of this application has a first direction and a second direction, including:

[0005] The housing has a pressure relief hole and a receiving cavity and a first through groove extending along the first direction, wherein the pressure relief hole communicates with the receiving cavity;

[0006] Electrode assembly is disposed in the receiving cavity;

[0007] A first cover plate is disposed on one side of the receiving cavity and connected to the housing; the first cover plate has a second through groove extending along the first direction, and the second through groove communicates with the first through groove;

[0008] A second cover plate is disposed on the side of the receiving cavity away from the first cover plate and is connected to the housing; the second cover plate has a third through groove that extends along the first direction and communicates with the first through groove;

[0009] A pressure relief component is connected to the housing and covers the pressure relief hole.

[0010] In some embodiments, the secondary battery has a third direction intersecting the first direction and the second direction, the housing has a first side surface in the second direction, the first through groove has a slot away from the receiving cavity along the second direction, and the pressure relief hole is disposed on one side of the slot along the third direction.

[0011] In some embodiments, the housing has a plurality of pressure relief holes, all of which are disposed on the first side, and at least two of the pressure relief holes are disposed on both sides of the slot along the third direction; the secondary battery includes a plurality of pressure relief components, each of which is connected to the housing and covers one of the pressure relief holes.

[0012] In some embodiments, the pressure relief hole is located on the side of the housing away from the first through groove along the second direction.

[0013] In some embodiments, the first through groove has a bottom wall, the pressure relief hole penetrates the bottom wall and communicates with the first through groove and the receiving cavity respectively, and the pressure relief member is connected to the bottom wall and covers the pressure relief hole.

[0014] In some embodiments, the secondary battery has a third direction intersecting the first direction and the second direction, the first through groove has two sidewalls disposed opposite to each other along the third direction, the housing has a plurality of pressure relief holes, the secondary battery includes a plurality of pressure relief components, each sidewall is provided with at least one pressure relief hole, and one pressure relief component is connected to the sidewall and covers one pressure relief hole.

[0015] In some embodiments, the secondary battery includes:

[0016] The first terminal is embedded in the first cover plate and is electrically connected to the electrode assembly;

[0017] The second terminal is embedded in the second cover plate and is electrically connected to the electrode assembly.

[0018] In some embodiments, the secondary battery has a third direction intersecting the first direction and the second direction, the first through slot has an opening along the second direction away from the receiving cavity, and the secondary battery includes:

[0019] A first terminal is disposed on one side of the first through groove along the third direction; the first terminal is embedded in the housing and is electrically connected to the electrode assembly;

[0020] The second terminal is disposed along the third direction on the side of the first through slot away from the first terminal; the second terminal is embedded in the housing and is electrically connected to the electrode assembly.

[0021] Accordingly, a battery pack according to an embodiment of this application includes a housing and a secondary battery as described in any of the foregoing embodiments, wherein the secondary battery is disposed within the housing.

[0022] Accordingly, an electrical device described in this application includes a secondary battery as described in any of the foregoing embodiments, or a battery pack as described in the foregoing embodiments.

[0023] Beneficial Effects: Compared with the prior art, a secondary battery according to an embodiment of this application has a first direction and a second direction, including a shell, an electrode assembly, a first cover plate, a second cover plate, and a pressure relief component. The shell has a pressure relief hole and a receiving cavity and a first through groove extending along the first direction, with the pressure relief hole communicating with the receiving cavity. The electrode assembly is disposed in the receiving cavity. The first cover plate is disposed on one side of the receiving cavity and connected to the shell. The first cover plate has a second through groove extending along the first direction and communicating with the first through groove. The second cover plate is disposed on the side of the receiving cavity away from the first cover plate and connected to the shell. The second cover plate has a third through groove extending along the first direction and communicating with the first through groove. The pressure relief component is connected to the shell and seals the pressure relief hole. By providing a first through groove on the shell, a second through groove on the first cover plate, and a third through groove on the second cover plate, this application can form a through three-dimensional heat dissipation path on the outer surface of the secondary battery. The first through groove, the second through groove, and the third through groove can accommodate a heat dissipation medium or a heat dissipation device, effectively improving the heat exchange and heat dissipation efficiency of the secondary battery. In addition, the pressure relief component is located on the housing, and the pressure relief component is not coplanar with the terminal, which facilitates direct contact between the housing and the exhaust channel for venting and pressure relief, while realizing the thermoelectric separation of the secondary battery, which helps to improve the safety of the secondary battery.

[0024] Compared with the prior art, a battery pack according to an embodiment of this application includes a housing and a secondary battery as described in any of the foregoing embodiments, wherein the secondary battery is disposed in the housing.

[0025] It is understood that the battery pack of this application embodiment includes all the technical features and effects of the aforementioned secondary battery, which will not be repeated here.

[0026] Compared with the prior art, an electrical device according to an embodiment of this application includes a secondary battery as described in any of the foregoing embodiments, or a battery pack as described in the foregoing embodiments.

[0027] It is understood that the electrical device in the embodiments of this application includes all the technical features and effects of the aforementioned secondary battery or battery pack, which will not be repeated here. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the structure of a secondary battery according to an embodiment of this application;

[0030] Figure 2 This is an exploded view of a secondary battery according to an embodiment of this application;

[0031] Figure 3 This is a bottom view of a secondary battery according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the structure of a secondary battery with a square shell and pressure relief components provided on both sides of the slot according to an embodiment of this application.

[0033] Figure 5 This is a schematic diagram of the structure of a secondary battery in which a pressure relief component is disposed on one side of the first through groove, according to an embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the structure of a secondary battery with a pressure relief component disposed on the bottom wall and terminals disposed on the cover plate, according to an embodiment of this application.

[0035] Figure 7 yes Figure 6 A bottom view;

[0036] Figure 8 This is a schematic diagram of the structure of a secondary battery according to an embodiment of this application, wherein the pressure relief component is disposed on the bottom wall and the terminal is disposed on the side of the housing away from the first through groove;

[0037] Figure 9 This is a schematic diagram of the structure of a secondary battery with a pressure relief component disposed on the side wall according to an embodiment of this application;

[0038] Figure 10 yes Figure 9 A sectional view;

[0039] Figure 11 This is a schematic diagram of the structure of a secondary battery with a pressure relief component disposed on the bottom wall and terminals disposed on both sides of the slot according to an embodiment of this application;

[0040] Figure 12 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Receiving cavity; 12. First through groove; 121. Groove opening; 122. Bottom wall; 123. Side wall; 13. Pressure relief hole; 14. First side surface; 15. Second side surface; 2. Electrode assembly; 3. First cover plate; 31. Second through groove; 4. Second cover plate; 42. Third through groove; 5. Pressure relief component; 6. First terminal; 7. Second terminal; 8. Housing; X, First direction; Z, Second direction; Y, Third direction. Detailed Implementation

[0042] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0043] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0044] It should also be noted that in the accompanying drawings of this application, arrows labeled X indicate the first direction X, arrows labeled Z indicate the second direction Z, and arrows labeled Y indicate the third direction Y. The introduction of the first direction X, the second direction Z, and the third direction Y is to facilitate the description of the structural positional relationships of the battery pack, thereby aiding in understanding its structure. In the embodiments of this application, the first direction X is the direction in which the first cover plate 3 and the second cover plate 4 are arranged, and it is also the extension direction of the housing 1; the second direction Z is the depth direction of the first through groove 12, and the third direction Y is the width direction of the first through groove 12; furthermore, the first direction X, the second direction Z, and the third direction Y intersect each other, and even more specifically, the first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0045] In related technologies, battery packs typically have thermal management components such as liquid cooling plates on one side of the secondary battery for heat exchange and cooling. However, since the secondary battery only has one side in contact with the liquid cooling plate for heat exchange, this can lead to unsatisfactory heat exchange or uneven local heat exchange.

[0046] In view of this, embodiments of this application provide a secondary battery, a battery pack, and an electrical device, aiming to solve the above-mentioned problems.

[0047] Please refer to the following: Figure 1 and Figure 2 This application provides a secondary battery with a first direction X and a second direction Z, and includes a housing 1, an electrode assembly 2, a first cover plate 3, a second cover plate 4, and a pressure relief component 5. The housing 1 has a pressure relief hole 13 and a receiving cavity 11 and a first through groove 12 that extend along the first direction X. The pressure relief hole 13 communicates with the receiving cavity 11. The electrode assembly 2 is disposed in the receiving cavity 11. The first cover plate 3 is disposed on one side of the receiving cavity 11 and connected to the housing 1. The first cover plate 3 has a second through groove 31 that extends along the first direction X and communicates with the first through groove 12. The second cover plate 4 is disposed on the side of the receiving cavity 11 away from the first cover plate 3 and connected to the housing 1. The second cover plate 4 has a third through groove 42 that extends along the first direction X and communicates with the first through groove 12. The pressure relief component 5 is connected to the housing 1 and seals the pressure relief hole 13.

[0048] This application creates a continuous three-dimensional heat dissipation path on the outer surface of the secondary battery by providing a first through groove 12 on the housing 1, a second through groove 31 on the first cover plate 3, and a third through groove 42 on the second cover plate 4. The first through groove 12, the second through groove 31, and the third through groove 42 can accommodate heat dissipation medium or heat dissipation device, effectively improving the heat exchange and heat dissipation efficiency of the secondary battery. In addition, the pressure relief component 5 is provided on the housing 1, and the pressure relief component 5 is not coplanar with the terminals, which facilitates direct contact between the housing 1 and the exhaust channel for venting and pressure relief, while realizing thermoelectric separation of the secondary battery, which helps to improve the safety of the secondary battery.

[0049] Specifically, in this embodiment, a heat exchange channel extending along the first direction X is formed by the cooperation of the first through groove 12, the second through groove 31, and the third through groove 42. This allows for heat exchange and cooling of the inner walls of the grooves, effectively increasing the heat exchange area compared to traditional batteries and improving the heat exchange effect. Furthermore, the through heat exchange channel can accommodate a heat exchange medium or a compatible thermal management component. By having the thermal management component penetrate the first through groove 12, the second through groove 31, and the third through groove 42, it can achieve greater contact and cooling with the secondary battery, further improving the heat exchange effect. Additionally, this application also provides a pressure relief hole 13 and a pressure relief component 5 on the housing 1. This allows the exhaust channel to be fitted to the housing 1 for rapid exhaust and pressure relief in case of thermal runaway. Preferably, the electrode terminals of the secondary battery and the pressure relief component 5 are not on the same plane, enabling thermoelectric separation of the secondary battery and improving its safety.

[0050] In the embodiments of this application, the first through groove 12, the second through groove 31 and the third through groove 42 are all the same in shape, depth and width, which facilitates the formation of a complete and smooth channel, making it easy to accommodate the heat management component and for the heat management component to fully fit with the groove walls of the first through groove 12, the second through groove 31 and the third through groove 42, thereby ensuring heat exchange efficiency.

[0051] It is understood that the secondary battery in this application can be a prismatic battery or a cylindrical battery, and the pressure relief component 5 can be an explosion-proof valve.

[0052] Please continue reading. Figure 1 and Figure 2 In some embodiments, the secondary battery includes a first terminal 6 and a second terminal 7. The first terminal 6 is embedded in the first cover plate 3 and is electrically connected to the electrode assembly 2; the second terminal 7 is embedded in the second cover plate 4 and is electrically connected to the electrode assembly 2.

[0053] In this embodiment, the first terminal 6 is disposed on the first cover plate 3 and the second terminal 7 is disposed on the second cover plate 4. At this time, the first terminal 6 and the second terminal 7 are disposed opposite to each other on both sides of the secondary battery along the first direction X. This facilitates the direct connection of multiple secondary batteries along the first direction X, realizing the series connection of multiple secondary batteries. Busbars and other components can be eliminated, which is beneficial to the lightweighting of the battery pack and the improvement of the volumetric energy density of the battery pack.

[0054] It should be noted that, in this embodiment of the application, by setting the terminals of the secondary battery to be located on the cover plate and the pressure relief component 5 to be located on the housing 1, the terminals of the secondary battery and the pressure relief component 5 can be made non-coplanar, which facilitates the thermoelectric separation of the secondary battery and thus helps to improve the safety of the secondary battery.

[0055] like Figure 3 and Figure 4 As shown, in some embodiments, the secondary battery has a third direction Y intersecting the first direction X and the second direction Z, the housing 1 has a first side 14 in the second direction Z, the first through groove 12 has a slot 121 along the second direction Z away from the receiving cavity 11, and the pressure relief hole 13 is provided on the side of the slot 121 along the third direction Y.

[0056] In this embodiment, the first side surface 14 can be the bottom surface of the secondary battery. A slot 121 of the first through groove 12 penetrates the first side surface 14, and a pressure relief hole 13 is located on the first side surface 14 and on one side of the slot 121. A heat exchange plate protruding from the bottom plate can be provided at the bottom of the battery pack housing 8, with the secondary battery straddling this heat exchange plate. The pressure relief hole 13 is located on the bottom surface of the secondary battery, enabling bottom-out venting of the secondary battery. This allows for venting through the venting channel on the bottom plate in case of battery thermal runaway, improving the safety of the battery pack. The electrode terminals of the secondary battery can be located on the first cover plate 3 and the second cover plate 4, thus achieving thermoelectric separation of the secondary battery. Alternatively, the electrode terminals can be located on the side of the housing 1 away from the pressure relief hole 13 along the second direction Z, or on both sides of the housing 1 along the third direction Y, both of which also achieve thermoelectric separation of the secondary battery.

[0057] like Figure 3 and Figure 4 As shown, in some embodiments, the housing 1 has a plurality of pressure relief holes 13, all of which are disposed on the first side 14, and at least two pressure relief holes 13 are disposed on both sides of the slot 121 along the third direction Y; the secondary battery includes a plurality of pressure relief components 5, each pressure relief component 5 being connected to the housing 1 and covering one pressure relief hole 13.

[0058] In this embodiment of the application, by providing multiple pressure relief holes 13, multiple exhaust outlets can be provided when the secondary battery experiences thermal runaway, thereby achieving faster exhaust and pressure relief of the secondary battery.

[0059] like Figure 5 As shown, in some embodiments, the pressure relief hole 13 is located on the side of the housing 1 away from the first through groove 12 along the second direction Z.

[0060] In this embodiment of the application, the housing 1 has a second side surface 15 in the second direction Z. The second side surface 15 and the first side surface 14 are arranged opposite to each other in the second direction Z. The pressure relief hole 13 is arranged on the second side surface 15. At this time, the pressure relief hole 13 is far away from the first through groove 12. The corresponding exhaust channel of the battery pack also needs to be arranged on the second side surface 15 so as to realize the smooth exhaust and pressure relief of the secondary battery.

[0061] It should be noted that by placing the pressure relief hole 13 on the second side 15, which intersects with the first cover plate 3 and the second cover plate 4, the pressure relief hole 13 is not coplanar with the first terminal 6 and the second terminal 7, thus achieving thermoelectric separation of the secondary battery and ensuring the safety of the battery pack. Simultaneously, the first through groove 12, the second through groove 31, and the third through groove 42 provide a larger heat exchange area for the secondary battery, effectively improving heat exchange efficiency and reducing the probability of thermal runaway.

[0062] like Figure 6 , Figure 7 and Figure 8 As shown, in some embodiments, the first through groove 12 has a bottom wall 122, the pressure relief hole 13 penetrates the bottom wall 122 and communicates with the first through groove 12 and the receiving cavity 11 respectively, and the pressure relief component 5 is connected to the bottom wall 122 and covers the pressure relief hole 13.

[0063] In this embodiment, the pressure relief hole 13 is disposed on the bottom wall 122 of the first through groove 12. At this time, the thermal management component housed in the first through groove 12 can integrate not only a heat exchange channel but also an exhaust channel. The exhaust channel is provided with an exhaust hole that is opposite to the pressure relief component 5. On the one hand, it can promptly exhaust the thermal runaway gas when the secondary battery experiences thermal runaway. On the other hand, by integrating the heat exchange channel and the exhaust channel together, the heat exchange medium in the heat exchange channel can be used to directly exchange heat and cool the thermal runaway gas in the exhaust channel, quickly reducing the temperature of the thermal runaway gas, thereby further reducing the possibility of thermal runaway of adjacent batteries and further improving safety.

[0064] Please refer to the following: Figure 9 and Figure 10 In some embodiments, the secondary battery has a third direction Y intersecting the first direction X and the second direction Z. The first through groove 12 has two sidewalls 123 arranged opposite to each other along the third direction Y. The housing 1 has a plurality of pressure relief holes 13. The secondary battery includes a plurality of pressure relief components 5. Each sidewall 123 is provided with at least one pressure relief hole 13. A pressure relief component 5 is connected to the sidewall 123 and covers a pressure relief hole 13.

[0065] In this embodiment, multiple pressure relief holes 13 are provided on the two side walls 123, corresponding to multiple pressure relief components 5. This allows for multiple pressure relief outlets during thermal runaway, enabling rapid venting and pressure relief. Since the pressure relief holes 13 are located on the side walls 123 of the first through groove 12, and the corresponding pressure relief components 5 are also located on the side walls 123 of the first through groove 12, heat exchange channels and exhaust channels can be simultaneously arranged within the thermal management component located in the first through groove 12. The heat exchange channels are used to circulate heat exchange medium for heat exchange with the side walls 123. The exhaust channels can be provided with corresponding exhaust holes positioned opposite to the pressure relief components 5, allowing thermal runaway gas to be rapidly discharged into the exhaust channels and out of the battery pack during individual cell thermal runaway. This structure integrates the heat exchange channels and exhaust channels, enabling rapid cooling of the thermal runaway gas in the exhaust channels using the heat exchange medium within the heat exchange channels, thereby improving the safety of the battery pack during thermal runaway.

[0066] like Figure 11As shown, in some embodiments, the secondary battery has a third direction Y intersecting the first direction X and the second direction Z. The first through groove 12 has a slot 121 along the second direction Z away from the receiving cavity 11. The secondary battery includes a first terminal 6 and a second terminal 7. The first terminal 6 is disposed on one side of the first through groove 12 along the third direction Y. The first terminal 6 is embedded in the housing 1 and electrically connected to the electrode assembly 2. The second terminal 7 is disposed on the side of the first through groove 12 away from the first terminal 6 along the third direction Y. The second terminal 7 is embedded in the housing 1 and electrically connected to the electrode assembly 2.

[0067] In this embodiment, by setting the pressure relief hole 13 on the bottom wall 122 of the first through groove 12, and setting the first terminal 6 and the second terminal 7 on the first side 14 of the housing 1, with the first terminal 6 and the second terminal 7 located on both sides of the groove opening 121 of the first through groove 12, the pressure relief hole 13, the first terminal 6 and the second terminal 7 are not coplanar. The pressure relief component 5 covering the pressure relief hole 13 is arranged opposite to the thermal management component in the first through groove 12. The pressure relief is achieved by using the exhaust channel integrated in the thermal management component. The first terminal 6 and the second terminal 7 are spaced apart from the pressure relief component 5 along the second direction Z. This also enables the thermoelectric separation of the secondary battery, which helps to improve the safety of the secondary battery.

[0068] like Figure 12 As shown, a battery pack according to an embodiment of this application includes a housing 8 and a secondary battery as described in any of the foregoing embodiments, wherein the secondary battery is disposed inside the housing 8.

[0069] It is understood that the battery pack of this application embodiment includes all the technical features and effects of the aforementioned secondary battery, which will not be repeated here.

[0070] Accordingly, an electrical device according to an embodiment of this application includes a secondary battery as described in any of the foregoing embodiments, or a battery pack as described in the foregoing embodiments.

[0071] It is understood that the electrical device in the embodiments of this application includes all the technical features and effects of the aforementioned secondary battery or battery pack, which will not be repeated here.

[0072] Of course, the electrical devices referred to in this application can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] The foregoing has provided a detailed description of a secondary battery, battery pack, and power-consuming device provided in the embodiments of this application, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. 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; and these 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 secondary battery, characterized in that, Having a first direction and a second direction, including: The housing has a pressure relief hole and a receiving cavity and a first through groove extending along the first direction, wherein the pressure relief hole communicates with the receiving cavity; Electrode assembly is disposed in the receiving cavity; A first cover plate is disposed on one side of the receiving cavity and connected to the housing; the first cover plate has a second through groove extending along the first direction, and the second through groove communicates with the first through groove; A second cover plate is disposed on the side of the receiving cavity away from the first cover plate and is connected to the housing; the second cover plate has a third through groove that extends along the first direction and communicates with the first through groove; A pressure relief component is connected to the housing and covers the pressure relief hole.

2. The secondary battery according to claim 1, characterized in that, The secondary battery has a third direction intersecting the first direction and the second direction. The housing has a first side surface in the second direction. The first through groove has a slot that penetrates the first side surface. The pressure relief hole is disposed on the first side surface and is located on the side of the slot along the third direction.

3. The secondary battery according to claim 2, characterized in that, The housing has a plurality of pressure relief holes, all of which are disposed on the first side, and at least two of the pressure relief holes are disposed on both sides of the slot along the third direction; The secondary battery includes multiple pressure relief components, each of which is connected to the housing and covers one of the pressure relief holes.

4. The secondary battery according to claim 1, characterized in that, The pressure relief hole is located on the side of the housing away from the first through groove along the second direction.

5. The secondary battery according to claim 1, characterized in that, The first through groove has a bottom wall, the pressure relief hole penetrates the bottom wall and communicates with the first through groove and the receiving cavity respectively, and the pressure relief component is connected to the bottom wall and covers the pressure relief hole.

6. The secondary battery according to claim 1, characterized in that, The secondary battery has a third direction intersecting the first direction and the second direction. The first through groove has two sidewalls arranged opposite to each other along the third direction. The housing has a plurality of pressure relief holes. The secondary battery includes a plurality of pressure relief components. Each sidewall is provided with at least one pressure relief hole. One pressure relief component is connected to the sidewall and covers one pressure relief hole.

7. The secondary battery according to claim 1, characterized in that, The secondary battery includes: The first terminal is embedded in the first cover plate and is electrically connected to the electrode assembly; The second terminal is embedded in the second cover plate and is electrically connected to the electrode assembly.

8. The secondary battery according to claim 1, characterized in that, The secondary battery has a third direction intersecting the first direction and the second direction, and the first through slot has a groove along the second direction away from the receiving cavity. The secondary battery includes: A first terminal is disposed on one side of the first through groove along the third direction; the first terminal is embedded in the housing and is electrically connected to the electrode assembly; The second terminal is disposed along the third direction on the side of the first through slot away from the first terminal; the second terminal is embedded in the housing and is electrically connected to the electrode assembly.

9. A battery pack, characterized in that, It includes a housing and a secondary battery as described in any one of claims 1-8, wherein the secondary battery is disposed within the housing.

10. An electrical appliance, characterized in that, It includes the secondary battery as described in any one of claims 1-8, or the battery pack as described in claim 9.

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