Single battery, battery pack and power utilization device

Abstract

The utility model discloses a single battery, a battery pack and a power utilization device, and belongs to the technical field of batteries, the single battery comprises a shell, the shell is provided with a containing cavity, a cover plate body is connected with the shell and covers the containing cavity, the cover plate body has a height direction, a pole hole is formed in the cover plate body in a penetrating mode in the height direction, and a pole is arranged in the pole hole in a penetrating mode; the pole column comprises a pole column body and a pole column base, the pole column body penetrates through the pole column hole, the pole column base is located on the side, close to the electrode assembly, of the pole column body and connected with the pole column body, the pole column body is provided with a groove in the height direction, the pole column base is provided with a through hole in the height direction in a penetrating mode, and the groove and the through hole communicate with the containing cavity; the pole lug penetrates through the through hole and is connected with the pole base; the sealing plate is connected with at least one of the pole base and the pole body to define a containing space, and the inner wall of the containing space is made of copper. According to the arrangement, when electrolyte permeates into the accommodating space, the copper-aluminum corrosion risk can be effectively avoided, and the safety and the reliability of the single battery are improved.

Description

Technical Field

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

[0002] As power battery technology matures and is widely used in electric vehicles and energy storage, the requirements for the performance and safety of power batteries are increasing.

[0003] In some batteries, electrolyte leaks into the negative electrode post. Since the negative electrode post is usually made of copper or aluminum, there is a risk of corrosion, which affects the safety and reliability of the battery. Utility Model Content

[0004] Purpose of the utility model: The embodiments of this application provide a single battery, a battery pack, and an electrical device, aiming to solve the technical problem of corrosion risk caused by electrolyte seepage into the electrode cavity.

[0005] Technical solution: This application provides a single-cell battery, including:

[0006] The shell has a receiving cavity;

[0007] An electrode assembly, located within a receiving cavity, includes an electrode body and a tab connected to each other;

[0008] A cover plate assembly includes a cover plate body and an electrode post. The cover plate body is connected to the housing and seals the receiving cavity. The cover plate body has a height direction. An electrode post hole is provided through the cover plate body along the height direction. The electrode post is inserted through the electrode post hole. The electrode post includes an electrode post body and an electrode post base. The electrode post body is inserted through the electrode post hole. The electrode post base is located on the side of the electrode post body close to the electrode assembly and is connected to the electrode post body. The electrode post body has a groove along the height direction. The electrode post base has a through hole along the height direction. The groove surrounds the through hole. The groove and the through hole communicate with the receiving cavity. An electrode ear is inserted through the through hole and is connected to the electrode post base.

[0009] A sealing plate is connected to at least one of the pole base and the pole body to form a receiving space, the inner wall of which is made of copper.

[0010] In some embodiments, the electrode base includes an electrode base plate and a first step portion. A through hole passes through the electrode base plate. The first step portion is connected to the electrode base plate along the height direction and is disposed on the side of the electrode base plate away from the electrode assembly. The first step portion is located in the groove and surrounds the through hole. A sealing plate abuts against the first step portion along the height direction. The sealing plate, the first step portion, the electrode base plate, and the electrode tab enclose and form an accommodating space.

[0011] In some embodiments, the sealing plate includes a sealing plate body and an abutment portion. The abutment portion is fixedly connected to the side of the sealing plate body facing the electrode assembly. The abutment portion is located in the groove and surrounds the through hole. The abutment portion is connected to the electrode post base along the height direction. The sealing plate body, the abutment portion, the electrode post base, and the electrode tab enclose and form a receiving space.

[0012] In some embodiments, the electrode base includes an electrode base plate and a second stepped portion, a through hole passing through the electrode base plate, the second stepped portion being connected to the electrode base plate along the height direction and disposed on the side of the electrode base plate away from the electrode assembly; the second stepped portion is located in the groove and surrounds the through hole;

[0013] The abutting part abuts against the second step part along the height direction, and the sealing plate body, the abutting part, the second step part, the pole base plate and the pole lug surround to form an accommodating space.

[0014] In some embodiments, one of the abutting portion and the second stepped portion is provided with a protrusion, and the other of the abutting portion and the second stepped portion is provided with a groove for the protrusion to be inserted.

[0015] In some embodiments, the electrode base includes an electrode base plate and a third step portion. The third step portion is connected to the electrode base plate along the height direction and is disposed on the side of the electrode base plate away from the electrode assembly. The third step portion is located in the groove and surrounds the through hole. The end of the third step portion away from the electrode assembly along the height direction has an opening. A sealing plate covers the opening in the height direction. The sealing plate, the third step portion, the electrode base plate, and the electrode tab enclose and form a receiving space.

[0016] In some embodiments, the sealing plate includes a first body and a second body, the first body being connected to the second body along the height direction, the first body being disposed on the side of the second body near the electrode assembly, and the first body being made of copper.

[0017] In some embodiments, the electrode post is the negative electrode post.

[0018] Accordingly, this application provides a battery pack including the aforementioned single battery cell.

[0019] Accordingly, embodiments of this application provide an electrical device, including the aforementioned single battery cell or the aforementioned battery pack.

[0020] Beneficial Effects: The single-cell battery of this application embodiment includes a casing, an electrode assembly, a cover assembly, and a sealing plate. The casing has a receiving cavity; the electrode assembly is located in the receiving cavity and includes an electrode body and a tab connected to each other; the cover assembly includes a cover body and a terminal post, the cover body is connected to the casing and seals the receiving cavity, the cover body has a height direction, and the cover body has a terminal post hole that extends through the terminal post along the height direction, the terminal post is inserted through the terminal post hole, the terminal post includes a terminal post body and a terminal post base, the terminal post body is inserted through the terminal post hole, the terminal post base is located on the side of the terminal post body near the electrode assembly and is connected to the terminal post body, the terminal post body has a groove along the height direction, the terminal post base has a through hole along the height direction, the groove surrounds the through hole, the groove and the through hole communicate with the receiving cavity, the tab is inserted through the through hole and is connected to the terminal post base; the sealing plate is connected to at least one of the terminal post base and the terminal post body to form a receiving space, the inner wall of the receiving space is copper. This design eliminates the need to fold the tabs; they are directly inserted through the through-hole and welded to the electrode base to achieve electrical connection with the electrode post and electrode body. This reduces space requirements and increases the energy density of the individual battery. Furthermore, it effectively avoids the risk of copper-aluminum corrosion when electrolyte seeps into the containment space, thereby improving the safety and reliability of the individual battery.

[0021] The battery pack of this application embodiment includes the above-described single battery cell, and therefore the battery pack can have all the technical features and beneficial effects of the above-described single battery cell, which will not be repeated here.

[0022] The electrical device in this application includes the above-mentioned single battery or the above-mentioned battery pack. Therefore, the electrical device can have all the technical features and beneficial effects of the above-mentioned single battery or the above-mentioned battery pack, which will not be repeated here. 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 a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0025] Figure 2 This is a cross-sectional view of the first type of single-cell battery according to an embodiment of this application;

[0026] Figure 3 This is an exploded view of the terminal post of the first type of single-cell battery according to an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the electrode post of the first type of single cell in this application embodiment;

[0028] Figure 5 This is a schematic diagram of the structure of the sealing plate of the first type of single cell in this application embodiment;

[0029] Figure 6 This is a cross-sectional view of a second type of single-cell battery according to an embodiment of this application;

[0030] Figure 7 This is an exploded view of the terminals of the second type of single-cell battery according to an embodiment of this application;

[0031] Figure 8 This is a schematic diagram of the structure of the sealing plate of the second type of single cell according to an embodiment of this application;

[0032] Figure 9 This is a cross-sectional view of a third type of single-cell battery according to an embodiment of this application;

[0033] Figure 10 This is an exploded view of the terminal post of the third type of single-cell battery according to an embodiment of this application;

[0034] Figure 11 This is a schematic diagram of the structure of the sealing plate of the third type of single cell in this application embodiment;

[0035] Figure 12 This is a cross-sectional view of the fourth type of single-cell battery according to an embodiment of this application;

[0036] Figure 13 This is an exploded view of the terminal post of the fourth type of single-cell battery according to an embodiment of this application;

[0037] Figure 14 This is a schematic diagram of the structure of the sealing plate of the fourth type of single cell in this application embodiment.

[0038] Reference numerals: 1. Housing; 2. Electrode assembly; 3. Cover plate assembly; 4. Sealing plate; 5. First step; 6. Second step; 7. Third step; 10. Protrusion; 11. Groove; 20. Electrode body; 21. Electrode tab; 30. Cover plate body; 31. Electrode post; 40. Receiving space; 41. Sealing plate body; 42. Abutment; 70. Opening; 100. Receiving cavity; 300. Electrode post hole; 310. Electrode post body; 311. Electrode post base; 312. Negative electrode post; 313. Positive electrode post; 400. First body; 401. Second body; 3100. Groove; 3110. Through hole; 3111. Electrode post base plate; 3112. Step; X, Height direction. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] The applicant notes that as power battery technology matures and is widely used in electric vehicles and energy storage, the requirements for the performance and safety of power batteries are increasing. In some batteries, electrolyte leakage occurs into the negative electrode terminal. Since the negative electrode terminal is typically made of copper or aluminum, this poses a corrosion risk, affecting the battery's safety and reliability.

[0042] In view of this, the single-cell battery of this application embodiment includes a housing, an electrode assembly, a cover assembly, and a sealing plate. The housing has a receiving cavity; the electrode assembly is located in the receiving cavity and includes an electrode body and a tab connected to each other; the cover assembly includes a cover body and a terminal post, the cover body is connected to the housing and seals the receiving cavity, the cover body has a height direction, and the cover body has a terminal post hole that extends through the terminal post along the height direction, the terminal post is inserted through the terminal post hole, the terminal post includes a terminal post body and a terminal post base, the terminal post body is inserted through the terminal post hole, the terminal post base is located on the side of the terminal post body near the electrode assembly and is connected to the terminal post body, the terminal post body has a groove along the height direction, the terminal post base has a through hole along the height direction, the groove surrounds the through hole, the groove and the through hole communicate with the receiving cavity, the tab is inserted through the through hole and is connected to the terminal post base; the sealing plate is connected to at least one of the terminal post base and the terminal post body to form a receiving space, the inner wall of the receiving space is copper. This design eliminates the need to fold the tabs; they are directly inserted through the through-hole and welded to the electrode base to achieve electrical connection with the electrode post and electrode body. This reduces space requirements and increases the energy density of the individual battery. Furthermore, it effectively avoids the risk of copper-aluminum corrosion when electrolyte seeps into the containment space, thereby improving the safety and reliability of the individual battery.

[0043] The single-cell battery, battery pack, and power-consuming device of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0044] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application; Figure 2 This is a cross-sectional view of the first type of single-cell battery according to an embodiment of this application; Figure 3 This is an exploded view of the terminal post 31 of the first type of single cell in this application embodiment; Figure 4 This is a schematic diagram of the structure of the terminal post 31 of the first type of single cell in this application embodiment; Figure 5 This is a schematic diagram of the structure of the sealing plate 4 of the first type of single cell in this application embodiment; Figure 6 This is a cross-sectional view of a second type of single-cell battery according to an embodiment of this application; Figure 7 This is an exploded view of the terminal post 31 of the second type of single cell in this application embodiment; Figure 8 This is a schematic diagram of the structure of the sealing plate 4 of the second type of single cell in this application embodiment;

[0045] Figure 9 This is a cross-sectional view of a third type of single-cell battery according to an embodiment of this application; Figure 10 This is an exploded view of the terminal post 31 of the third type of single cell in this application embodiment; Figure 11 This is a schematic diagram of the structure of the sealing plate 4 of the third type of single cell in this application embodiment; Figure 12 This is a cross-sectional view of the fourth type of single-cell battery according to an embodiment of this application; Figure 13This is an exploded view of the terminal post 31 of the fourth type of single cell in this application embodiment; Figure 14 This is a schematic diagram of the structure of the sealing plate 4 of the fourth type of single cell in this application embodiment.

[0046] refer to Figures 1 to 14 This application provides a single-cell battery, including a housing 1, an electrode assembly 2, a cover assembly 3, and a sealing plate 4. The housing 1 has a receiving cavity 100; the electrode assembly 2 is located within the receiving cavity 100, and the electrode assembly 2 includes an electrode body 20 and an electrode tab 21 connected to each other; the cover assembly 3 includes a cover body 30 and an electrode post 31. The cover body 30 is connected to the housing 1 and seals the receiving cavity 100. The cover body 30 has a height direction X, and an electrode post hole 300 is provided through the cover body 30 along the height direction X. The electrode post 31 passes through the electrode post hole 300 and includes an electrode post body 310 and an electrode post base 311. The electrode post body 310 passes through the electrode post hole 300, and the electrode post base 311... A tab 21 is located on the side of the electrode body 310 near the electrode assembly 2 and connected to the electrode body 310. The electrode body 310 has a groove 3100 along the height direction X, and the electrode base 311 has a through hole 3110 along the height direction X. The groove 3100 surrounds the through hole 3110, and the groove 3100 and the through hole 3110 connect to the receiving cavity 100. The tab 21 passes through the through hole 3110 and is connected to the electrode base 311. The sealing plate 4 is connected to at least one of the electrode base 311 and the electrode body 310 to form a receiving space 40. The inner wall of the receiving space 40 is made of copper. With this configuration, there is no need to fold the tab 21. The tab 21 is directly passed through the through hole 3110 and welded to the electrode base 311 to achieve electrical connection between the tab 31 and the electrode body 20, which can reduce space occupation and improve the energy density of the single cell. When electrolyte seeps into the containment space 40, the risk of copper-aluminum corrosion can be effectively avoided, thereby improving the safety and reliability of the single cell.

[0047] exist Figure 1 In the illustrated embodiment, the electrode post 31 includes a positive electrode post 313 and a negative electrode post 312, and the electrode tab 21 includes a positive electrode tab and a negative electrode tab. The positive electrode tab is electrically connected to the positive electrode post 313; the positive electrode post 313 and the positive electrode tab are made of aluminum, posing no risk of corrosion. Figures 2 to 13 In the illustrated embodiment, the terminal post 31 is the negative terminal post 312, and the tab 21 is the negative electrode tab, which is electrically connected to the negative terminal post 312. The negative terminal post 312 and the sealing plate 4 enclose a receiving space 40, and the inner wall of the receiving space 40 is made of copper. Exemplarily, the negative terminal post 312 is typically made of copper or aluminum, and the negative electrode tab is typically made of copper. In some embodiments, there is a possibility of electrolyte leakage into the negative terminal post 312. By making the inner wall of the receiving space 40 made of copper, the risk of copper-aluminum corrosion can be avoided, thereby improving the safety and reliability of the single battery cell.

[0048] In some embodiments, the electrode body 310 is provided with a groove 3100 along the height direction X, the groove 3100 surrounds the through hole 3110, and the sealing plate 4 covers the groove 3100. This configuration can reduce the weight of the electrode 31 while ensuring the current carrying capacity of the electrode 31, thereby improving the energy density of the single cell.

[0049] exist Figures 2 to 5 In the illustrated embodiment, the electrode base 311 includes an electrode base plate 3111 and a first stepped portion 5. A through hole 3110 penetrates the electrode base plate 3111. The first stepped portion 5 is connected to the electrode base plate 3111 along the height direction X and is located on the side of the electrode base plate 3111 away from the electrode assembly 2. The first stepped portion 5 is located within the groove 3100 and surrounds the through hole 3110. A sealing plate 4 abuts against the first stepped portion 5 along the height direction X. The sealing plate 4, the first stepped portion 5, the electrode base plate 3111, and the electrode tab 21 enclose a receiving space 40. The inner wall material of the receiving space 40 is copper, which can avoid the risk of copper-aluminum corrosion, thereby improving the safety and reliability of the single cell. The first stepped portion 5 and the electrode base plate 3111 are an integral structure. In some embodiments, the sealing plate 4 and the first stepped portion 5 can be sealed and fixed by laser welding or conductive adhesive. In other embodiments, the sealing plate 4 and the electrode body 310 can be sealed and fixed by laser welding or conductive adhesive.

[0050] In some embodiments, the sealing plate 4 includes a sealing plate body 41 and an abutment portion 42. The abutment portion 42 is fixedly connected to the side of the sealing plate body 41 facing the electrode assembly 2. The abutment portion 42 is located within the groove 3100 and surrounds the through hole 3110. The abutment portion 42 is connected to the electrode post base 311 along the height direction X. The sealing plate body 41, the abutment portion 42, the electrode post base 311, and the electrode tab 21 enclose a receiving space 40. The inner wall material of the receiving space 40 is set as copper, which can avoid the risk of copper-aluminum corrosion, thereby improving the safety and reliability of the single cell. The sealing plate body 41 and the abutment portion 42 are an integral structure. Figures 6 to 8 In the embodiments shown, the abutment portion 42 and the pole base 311 can be sealed and fixed by laser welding or conductive adhesive bonding; in some embodiments, the sealing plate body 41 and the pole body 310 can be sealed and fixed by laser welding or conductive adhesive bonding.

[0051] In some embodiments, the electrode base 311 includes an electrode base plate 3111 and a second step portion 6. A through hole 3110 passes through the electrode base plate 3111. The second step portion 6 is connected to the electrode base plate 3111 along the height direction X and is disposed on the side of the electrode base plate 3111 away from the electrode assembly 2. The second step portion 6 is located in the groove 3100 and surrounds the through hole 3110. The abutment portion 42 abuts against the second step portion 6 along the height direction X. The sealing plate body 41, the abutment portion 42, the second step portion 6, the electrode base plate 3111, and the electrode tab 21 enclose and form a receiving space 40. The inner wall material of the receiving space 40 is made of copper, which can avoid the risk of copper-aluminum corrosion, thereby improving the safety and reliability of the single cell. The pole base plate 3111 and the second step portion 6 are integral structures, and the sealing plate body 41 and the abutment portion 42 are integral structures. In some embodiments, the second step portion 6 and the abutment portion 42 can be sealed and fixed by laser welding or conductive adhesive. In other embodiments, the sealing plate body 41 and the pole body 310 can be sealed and fixed by laser welding or conductive adhesive.

[0052] In some embodiments, one of the abutting portion 42 and the second stepped portion 6 is provided with a protrusion 10, and the other of the abutting portion 42 and the second stepped portion 6 is provided with a groove 11 for the protrusion 10 to be inserted. Figures 9 to 11 In the embodiment shown, the second step portion 6 is provided with a groove 11, and the abutment portion 42 is provided with a protrusion 10. In this configuration, the protrusion 10 of the abutment portion 42 and the groove 11 of the second step portion 6 are nested together to increase the contact area between the second step portion 6 and the abutment portion 42, thereby improving the connection stability between the second step portion 6 and the abutment portion 42. This can improve the sealing performance of the accommodating space 40 and prevent electrolyte leakage.

[0053] exist Figures 12 to 14 In the illustrated embodiment, the electrode base 311 includes an electrode base plate 3111 and a third step portion 7. The third step portion 7 is connected to the electrode base plate 3111 along the height direction X and is located on the side of the electrode base plate 3111 away from the electrode assembly 2. The third step portion 7 is located within the groove 3100 and surrounds the through hole 3110. The end of the third step portion 7 away from the electrode assembly 2 along the height direction X has an opening 70. The sealing plate 4 covers the opening 70 in the height direction X. The sealing plate 4, the third step portion 7, the electrode base plate 3111, and the electrode tab 21 enclose and form an accommodating space 40. The third step portion 7 and the electrode base plate 3111 are an integral structure, and the third step portion 7 and the sealing plate 4 can be sealed and fixed by laser welding or conductive adhesive. This arrangement can avoid occupying too much space in the height direction X and improve the energy density of the single cell.

[0054] In some embodiments, the sealing plate 4 includes a first body 400 and a second body 401. The first body 400 is connected to the second body 401 along the height direction X. The first body 400 is disposed on the side of the second body 401 near the electrode assembly 2. The first body 400 is made of copper. Exemplarily, the first body 400 is made of copper or a copper alloy, and the second body 401 is made of aluminum or an aluminum alloy. The first body 400 and the second body 401 can be manufactured by copper-aluminum composite friction welding or by machining a copper-aluminum composite plate. This application does not limit the specific manufacturing process.

[0055] exist Figure 2 and Figure 5 In the illustrated embodiment, the first body 400 and the first stepped portion 5 abut against each other in the height direction X. The first body 400, the first stepped portion 5, the terminal base plate 3111, and the tab 21 enclose a receiving space 40. The first body 400, the first stepped portion 5, the terminal base plate 3111, and the tab 21 are made of copper or a copper alloy, while the terminal body 310 and the second body 401 can be made of aluminum or an aluminum alloy. This configuration avoids copper-aluminum corrosion problems if electrolyte seeps into the receiving space 40 through the gap between the tab 21 and the terminal base 311, thereby improving the safety and reliability of the single-cell battery.

[0056] exist Figure 6 and Figure 8 In the illustrated embodiment, the first body 400 and the abutment portion 42 are an integral structure. The first body 400, the abutment portion 42, the terminal base 311, and the tab 21 enclose and form a receiving space 40. The first body 400, the abutment portion 42, the terminal base 311, and the tab 21 are made of copper or copper alloy, while the terminal body 310 and the second body 401 can be made of aluminum or aluminum alloy. With this configuration, if electrolyte seeps into the receiving space 40 through the gap between the tab 21 and the terminal base 311, copper-aluminum corrosion can be avoided, thereby improving the safety and reliability of the single battery cell.

[0057] exist Figure 9 and Figure 11 In the illustrated embodiment, the first body 400 and the abutment portion 42 are an integral structure. The first body 400, the abutment portion 42, the second step portion 6, the electrode base plate 3111, and the electrode tab 21 enclose and form a receiving space 40. The first body 400, the abutment portion 42, the second step portion 6, the electrode base plate 3111, and the electrode tab 21 are made of copper or copper alloy, while the electrode body 310 and the second body 401 can be made of aluminum or aluminum alloy. With this configuration, if electrolyte seeps into the receiving space 40 through the gap between the electrode tab 21 and the electrode base 311, copper-aluminum corrosion problems can be avoided, thereby improving the safety and reliability of the single battery cell.

[0058] exist Figure 12 and Figure 14 In the illustrated embodiment, the sealing plate 4 can be made of copper or a copper alloy. The sealing plate 4, the third step portion 7, the terminal base plate 3111, and the tab 21 together form a receiving space 40. The third step portion 7, the terminal base plate 3111, and the tab 21 are all made of copper or a copper alloy. This design prevents copper-aluminum corrosion problems if electrolyte seeps into the receiving space 40 through the gap between the tab 21 and the terminal base 311, thereby improving the safety and reliability of the single-cell battery.

[0059] In some embodiments, a single cell refers to a basic unit capable of converting chemical energy into electrical energy, which can be used to make batteries or battery packs to supply power to electrical devices or energy storage devices.

[0060] In some embodiments, a single cell can be a rechargeable cell, which refers to a cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0061] In some embodiments, a single battery cell may be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but this application embodiment does not limit this.

[0062] Accordingly, embodiments of this application provide a battery pack including the aforementioned individual battery cells. A battery pack can be a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. When there are multiple individual battery cells, they can be connected in series, parallel, or a combination thereof.

[0063] Accordingly, this application provides an electrical device, including the aforementioned single battery or the aforementioned battery pack. The battery pack is the power source for the electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, and power tool, etc. For example, 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, etc.

[0064] 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.

[0065] The foregoing has provided a detailed description of a single battery, battery pack, and power 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 descriptions of the above embodiments are 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 single-cell battery, characterized in that, include: The shell has a receiving cavity; An electrode assembly is located within the receiving cavity, and the electrode assembly includes an electrode body and a tab connected to each other. A cover plate assembly includes a cover plate body and an electrode post. The cover plate body is connected to the housing and covers the receiving cavity. The cover plate body has a height direction and an electrode post hole is provided through the cover plate body along the height direction. The electrode post includes an electrode post body and an electrode post base. The electrode post body is disposed through the electrode post hole. The electrode post base is located on the side of the electrode post body closer to the electrode assembly and is connected to the electrode post body. The electrode post body has a groove along the height direction. The electrode post base has a through hole along the height direction. The groove surrounds the through hole. The groove and the through hole communicate with the receiving cavity. An electrode tab is disposed through the through hole and is connected to the electrode post base. A sealing plate is connected to at least one of the pole base and the pole body to form a receiving space, the inner wall of the receiving space being made of copper.

2. The single-cell battery according to claim 1, characterized in that, The electrode base includes an electrode base plate and a first stepped portion. The through hole passes through the electrode base plate. The first stepped portion is connected to the electrode base plate along the height direction and is located on the side of the electrode base plate away from the electrode assembly. The first stepped portion is located in the groove and surrounds the through hole. The sealing plate abuts against the first stepped portion along the height direction. The sealing plate, the first stepped portion, the electrode base plate, and the electrode tab enclose the receiving space.

3. The single-cell battery according to claim 1, characterized in that, The sealing plate includes a sealing plate body and an abutment portion. The abutment portion is fixedly connected to the side of the sealing plate body facing the electrode assembly. The abutment portion is located in the groove and surrounds the through hole. The abutment portion is connected to the pole base along the height direction. The sealing plate body, the abutment portion, the pole base, and the pole ear together form the receiving space.

4. The single-cell battery according to claim 3, characterized in that, The electrode base includes an electrode base plate and a second stepped portion. The through hole passes through the electrode base plate. The second stepped portion is connected to the electrode base plate along the height direction and is located on the side of the electrode base plate away from the electrode assembly. The second stepped portion is located in the groove and surrounds the through hole. The abutting part abuts against the second step part along the height direction, and the sealing plate body, the abutting part, the second step part, the pole base plate and the pole ear surround to form the receiving space.

5. The single-cell battery according to claim 4, characterized in that, One of the abutting portion and the second stepped portion is provided with a protrusion, and the other of the abutting portion and the second stepped portion is provided with a groove for the protrusion to be inserted.

6. The single-cell battery according to claim 1, characterized in that, The electrode base includes an electrode base plate and a third step portion. The third step portion is connected to the electrode base plate along the height direction and is disposed on the side of the electrode base plate away from the electrode assembly. The third step portion is located in the groove and surrounds the through hole. The end of the third step portion away from the electrode assembly along the height direction has an opening. The sealing plate covers the opening in the height direction. The sealing plate, the third step portion, the electrode base plate, and the electrode tab enclose the receiving space.

7. The single-cell battery according to claim 1, characterized in that, The sealing plate includes a first body and a second body. The first body is connected to the second body along the height direction. The first body is disposed on the side of the second body near the electrode assembly. The first body is made of copper.

8. The single-cell battery according to claim 1, characterized in that, The electrode is a negative electrode.

9. A battery pack, characterized in that, Includes a single cell battery as described in any one of claims 1 to 8.

10. An electrical device, characterized in that, It includes a single cell as described in any one of claims 1 to 8, or a battery pack as described in claim 9.

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