Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery monomer comprises: a housing comprising a shell and an end cover, the end cover being provided with a mounting through hole in a penetrating manner; the polar column is arranged in the mounting through hole in a penetrating manner, a containing groove for containing cooling liquid is formed in the polar column, and a groove opening of the containing groove is located in the end face, facing the interior of the shell, of the polar column; the electrode assembly is arranged in the shell and comprises a tab; and the adapter is positioned on one side, facing the interior of the shell, of the end cover, is electrically connected with the pole and the tab, and seals the notch of the accommodating groove. The battery monomer, the battery and the electric device provided by the utility model can prolong the service life of the battery and reduce the risk of thermal runaway.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, a battery and an electric device. Background Art

[0002] With the development of battery technology, people have higher requirements in aspects such as fast charging, lifespan, endurance, cost performance, and safety. However, the current obstacle restricting the wide spread of batteries lies in the limitation of charging speed. Therefore, the super-fast charging technology of batteries has also become an important development direction in new energy.

[0003] Behind the fast charging technology, in addition to dangerous phenomena such as rapid lithium deposition, it will also cause the problem of rapid heating of the battery. The heating power of the battery under fast charging will increase at a multiple rate exceeding the battery charging rate, and due to the extremely low thermal conductivity of the battery itself, it is difficult for the heat of the battery to spread to the surrounding environment or the liquid cooling plate. The continuous high temperature not only affects the battery lifespan, but in severe cases, thermal runaway accidents may occur. Summary of the Utility Model

[0004] Based on this, in view of the above problems, it is necessary to provide a battery cell, a battery and an electric device that can extend the battery lifespan and reduce the risk of thermal runaway.

[0005] A battery cell, the battery cell comprising:

[0006] A housing, including a shell and an end cover, and an installation through hole is formed through the end cover;

[0007] A pole column, passing through the installation through hole, and a receiving groove for receiving a coolant is formed in the pole column, and the notch of the receiving groove is located at the end face of the pole column facing the inside of the shell;

[0008] An electrode assembly, disposed inside the shell and including a tab; and

[0009] An adapter, located on the side of the end cover facing the inside of the shell, and electrically connected to both the pole column and the tab, and the adapter seals the notch of the receiving groove.

[0010] In some embodiments, a liquid inlet hole and a liquid outlet hole are formed in the pole column, both the liquid inlet hole and the liquid outlet hole are communicated with the receiving groove, and the liquid inlet hole and the liquid outlet hole extend from the receiving groove to the end face of the pole column facing away from the inside of the shell.

[0011] In some embodiments, a blasting weak part is formed on the adapter; the orthographic projection of the blasting weak part on the end face of the pole column facing the inside of the shell falls into the notch of the receiving groove.

[0012] In some of these embodiments, the blasting weak part is a groove structure, and the notch of the groove structure faces the pole column.

[0013] In some of these embodiments, a welding area for welding with the pole column is formed on the adapter, and the welding area is arranged circumferentially around the notch of the receiving groove.

[0014] In some of these embodiments, the pole column includes a base portion and a convex portion protruding from the base portion. The base portion is located on the side of the end cap facing the inside of the housing, the convex portion passes through the mounting through hole, and the receiving groove extends from the base portion to the convex portion;

[0015] The cross-sectional area of the receiving groove is S 1 , and the cross-sectional area of the section of the convex portion forming the receiving groove is S 2 , S 1 ≥10%S 2 .

[0016] A battery, the battery includes:

[0017] A bus bar; and

[0018] The battery cells as described in any one of the above embodiments, wherein a plurality of the battery cells are arranged in a row, and two pole columns in two adjacent battery cells arranged in a row are electrically connected through the bus bar.

[0019] In some of these embodiments, a liquid inlet hole and a liquid outlet hole are formed in the pole column. The liquid inlet hole and the liquid outlet hole are both communicated with the receiving groove, and the liquid inlet hole and the liquid outlet hole extend from the receiving groove to the end face of the pole column facing away from the inside of the housing;

[0020] The battery further includes a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe and the liquid outlet pipe correspond to the pole columns one by one. The liquid inlet pipe and the liquid outlet pipe both pass through the bus bar connected to the corresponding pole column, and the liquid inlet pipe is communicated with the liquid inlet hole on the corresponding pole column, and the liquid outlet pipe is communicated with the liquid outlet hole on the corresponding pole column.

[0021] In some of these embodiments, the liquid inlet pipe and the liquid outlet pipe corresponding to different pole columns passing through the same bus bar are communicated to form a communicating pipe.

[0022] An electrical device, the electrical device includes the battery as described in any one of the above embodiments, and the battery is used to provide electrical energy.

[0023] The above battery cell, battery and electrical device can extend the battery life and reduce the risk of thermal runaway by providing a receiving groove in the terminal post and introducing a coolant into the receiving groove, which can absorb the heat on the terminal post and the adapter during the operation of the battery cell. Description of the Drawings

[0024] Figure 1 Structural schematic diagram of a battery according to an embodiment of the present application;

[0025] Figure 2 is Figure 1 Structural schematic diagram of the battery shown after removing the bus bar, liquid inlet pipe, connecting pipe and liquid outlet pipe;

[0026] Figure 3 Top view of a battery cell according to an embodiment of the present application after removing the housing;

[0027] Figure 4 is Figure 3 Cross-sectional view of the battery cell shown along the A-A direction;

[0028] Figure 5 is Figure 4 Enlarged schematic view of the partial structure B in the battery cell shown;

[0029] Figure 6 Inverted view of a battery cell according to an embodiment of the present application after removing the housing;

[0030] Figure 7 Cross-sectional view of the terminal post in a battery cell according to an embodiment of the present application.

[0031] Reference Numerals in the Drawings:

[0032] 1. Battery;

[0033] 10. Battery cell; 20. Bus bar; 30. Liquid inlet pipe; 40. Connecting pipe; 50. Liquid outlet pipe;

[0034] 11. Outer shell; 111. Housing; 112. End cap; 112a. Mounting through hole; 12. Terminal post; 121. Receiving groove; 122. Liquid inlet hole; 123. Liquid outlet hole; 124. Base; 125. Protrusion; 13. Adapter. Detailed Embodiments

[0035] To make the above objects, features, and advantages of the present application more apparent and understandable, the following detailed description of the specific embodiments of the present application will be given with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0038] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0040] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this article are only for the purpose of illustration and do not represent the only implementation.

[0041] Please refer to Figure 1 and Figure 2 , currently, from the perspective of the development of the market situation, the application of Battery 1 is becoming more and more widespread. Battery 1 is not only applied to energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of Battery 1, the market demand is also constantly increasing.

[0042] With the development of Battery 1 technology, people have higher requirements in terms of fast charging, lifespan, endurance, cost performance, safety, etc. However, the current obstacle restricting the wide spread of Battery 1 lies in the limitation of the charging speed. Therefore, the super fast charging technology of Battery 1 has also become an important development direction in new energy that cannot be ignored.

[0043] Behind the fast charging technology, in addition to the occurrence of dangerous phenomena such as rapid lithium deposition, it will also lead to the problem of rapid heating of Battery 1. The heating power of Battery 1 under fast charging will increase at a multiple rate exceeding the charging rate of Battery 1, and due to the extremely low thermal conductivity of Battery 1 itself, it is difficult for the heat of Battery 1 to diffuse to the surrounding environment or the liquid cooling plate. The continuous high temperature not only affects the lifespan of Battery 1, but also serious thermal runaway accidents may occur in severe cases.

[0044] Please refer to again Figures 2 to 6 , in order to alleviate the above problems, after in-depth research, the applicant designed a battery cell 10. The battery cell 10 includes a housing 11, a terminal 12, an electrode assembly and an adapter 13. The housing 11 includes a shell 111 and an end cap 112. An installation through hole 112a is provided through the end cap 112. The terminal 12 passes through the installation through hole 112a, and a receiving groove 121 for accommodating the coolant is provided in the terminal 12. The opening of the receiving groove 121 is located on the end face of the terminal 12 facing the inside of the shell 111. The electrode assembly is disposed in the shell 111 and includes a tab. The adapter 13 is located on the side of the end cap 112 facing the inside of the shell 111 and is electrically connected to both the terminal 12 and the tab, and the adapter 13 seals the opening of the receiving groove 121.

[0045] Among them, the outer shell 11 refers to a component that isolates the internal environment of the battery cell 10 from the external environment. The housing 111 can be a hollow structure with one end open and one end closed, or it can also be a hollow structure with both ends open. The number of end caps 112 is the same as and corresponds one by one to the number of openings of the housing 111, and the end cap 112 covers the corresponding opening of the housing 111. Optionally, the housing 111 and the end cap 112 can both be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 112 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 10 to have higher structural strength and improved safety performance.

[0046] The pole post 12 passes through the mounting through hole 112a on the end cap 112 and is connected to the end cap 112 by means such as injection molding connection and riveting. In addition, the pole post 12 is also connected to the tab of the electrode assembly through the adapter 13 for outputting or inputting the electric energy of the battery cell 10. There are usually two pole posts 12, one of which is the positive pole post 12 and the other is the negative pole post 12. When the housing 111 is a hollow structure with one end open and one end closed, and the end cap 112 is one and covers the opening of the housing 111, the positive pole post 12 and the negative pole post 12 are arranged on the same end cap 112. When the housing 111 is a hollow structure with both ends open, and there are two end caps 112 that respectively cover the corresponding openings of the housing 111, the positive pole post 12 and the negative pole post 12 are respectively arranged on the two end caps 112. For the convenience of description, the following embodiments will be described by taking the housing 111 as a hollow structure with one end open and one end closed, and the positive pole post 12 and the negative pole both being arranged on the same end cap 112 as an example.

[0047] A receiving groove 121 is formed on the pole post 12, and the receiving groove 121 is used to receive the coolant. Among them, the coolant can be water, alcohol or other substances with a large specific heat capacity for circulation.

[0048] The electrode assembly is a component in the battery cell 10 where an electrochemical reaction occurs. The electrode assembly is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and usually a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the main body part of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively constitute the tabs. The positive tab and the negative tab can be located at one end of the main body part together or at both ends of the main body part respectively. During the charging and discharging process of the battery 1, the positive active substance and the negative active substance react with the electrolyte, and the tabs are connected to the pole post 12 through the adapter 13 to form a current loop.

[0049] The adapter 13 is a conductive component in the battery cell 10 for electrically connecting the terminal post 12 and the tab. The adapter 13 is located on the side of the end cap 112 facing the inside of the housing 111, is fixedly connected to the terminal post 12, and the adapter 13 seals the notch of the receiving groove 121. Specifically, there are two adapters 13, namely the positive adapter 13 and the negative adapter 13 respectively. The positive adapter 13 is used to seal the notch of the receiving groove 121 of the positive terminal post 12 and electrically connect the positive tab to the positive post 12. The negative adapter 13 is used to seal the notch of the receiving groove 121 of the negative terminal post 12 and electrically connect the negative tab to the negative post 12, so as to prevent the coolant in the receiving grooves 121 of the positive terminal post 12 and the negative terminal post 12 from leaking.

[0050] Among them, the positive post 12 and the negative post 12 have the same structure, and the positive adapter 13 and the negative adapter 13 have the same structure.

[0051] By providing the receiving groove 121 in the terminal post 12 and introducing the coolant into the receiving groove 121, the coolant can absorb the heat of the terminal post 12 and the adapter 13 during the operation of the battery 1, thereby extending the life of the battery 1 and reducing the risk of thermal runaway.

[0052] Please refer to again Figure 5 , in some alternative embodiments, a liquid inlet hole 122 and a liquid outlet hole 123 are formed in the terminal post 12. Both the liquid inlet hole 122 and the liquid outlet hole 123 communicate with the receiving groove 121, and the liquid inlet hole 122 and the liquid outlet hole 123 extend from the receiving groove 121 to the end face of the terminal post 12 facing away from the inside of the housing 111. The coolant enters through the liquid inlet hole 122 and flows out through the liquid outlet hole 123, so that the coolant can circulate between the receiving groove 121 and the outside, thereby fully absorbing the heat of the terminal post 12 and the adapter 13 and preventing the temperature from further rising and affecting the performance of the battery cell.

[0053] In some alternative embodiments, a bursting weak part is formed on the adapter 13; the orthographic projection of the bursting weak part on the end face of the terminal post 12 facing the inside of the housing 111 falls into the notch of the receiving groove 121. When thermal runaway occurs inside the battery 1, the coolant in the receiving groove 121 forms a high-temperature fluid and impacts the bursting area, causing the bursting area to rupture, and the coolant is released into the battery cell 10 to prevent the battery 1 from further heating up and catching fire.

[0054] Furthermore, in some alternative embodiments, the bursting weak part is a groove structure, and the notch of the groove structure faces the terminal post 12. Among them, the groove structure can be an annular groove, or it can also be a non-annular groove. This way of forming the bursting weak part is simple and easy to operate and is convenient for forming.

[0055] In some alternative embodiments, a welding area for welding with the pole 12 is formed on the adapter 13, and the welding area is disposed circumferentially around the notch of the receiving groove 121. By using a welding device to weld the welding area, the connection between the pole 12 and the adapter 13 can be achieved, and this connection method is simple and reliable. In addition, the orthographic projection of the welding area on the adapter 13 completely falls within the pole 12, and the welding area is disposed circumferentially around the notch of the receiving groove 121. In this way, the welding device can weld the adapter 13 and the pole 12 along the circumference of the receiving groove 121, and the welding is more stable and reliable.

[0056] Please refer to again Figure 2 、 Figure 5 and Figure 7 again. In some alternative embodiments, the pole 12 includes a base portion 124 and a convex portion 125 protruding from the base portion 124. The base portion 124 is located on the side of the end cap 112 facing the inside of the housing 111, and the convex portion 125 passes through the mounting through hole 112a. The receiving groove 121 extends from the base portion 124 to the convex portion 125; the cross-sectional area of the receiving groove 121 is S 1 and the cross-sectional area of the section of the receiving groove 121 formed by the convex portion 125 is S 2 where S 1 ≥10%S 2 . The larger the proportion of the cross-sectional area of the receiving groove 121, the larger the volume space in the receiving groove 121, and the more coolant can be stored, which is beneficial to improving the cooling effect. The cross-sectional area of the receiving groove 121 is S 1 and the cross-sectional area of the section of the receiving groove 121 formed by the convex portion 125 is S 2 where S 1 ≥10%S 2 . In this way, it can be ensured that the receiving groove 121 has a large receiving space and good heat conduction effect.

[0057] Please refer to again Figure 1 and Figure 2 again. The present application also provides a battery 1, which includes a bus bar 20 and battery cells 10. The battery cells 10 are multiple and arranged in rows, and two poles 12 in two adjacent battery cells 10 arranged in rows are electrically connected through the bus bar 20.

[0058] Among them, the battery cell 10 includes two pole columns 12, one of which is the positive pole column 12 and the other is the negative pole column 12. The positive pole column 12 and the negative pole column 12 of the battery cell 10 can be arranged at the same end or opposite ends of the battery cell 10. The positive pole columns 12 and the negative pole columns 12 of all the battery cells 10 can be alternately arranged in rows to form two rows of mixed pole column rows, or alternatively, the positive pole columns 12 of all the battery cells 10 can be arranged in a row to form a row of positive pole columns, and the negative pole columns 12 of all the battery cells 10 can be arranged in a row to form a row of negative pole columns.

[0059] Specifically, taking all the battery cells 10 connected in series as an example, every two adjacent positive pole columns 12 and negative pole columns 12 in the same mixed pole column row are connected by a bus bar 20. Taking all the battery cells 10 connected in parallel as an example, every two adjacent positive pole columns 12 in the positive pole column row are connected by a bus bar 20, and every two adjacent negative pole columns 12 in the negative pole column row are also connected by a bus bar 20. By arranging the bus bar 20, the series or parallel connection of the battery cells 10 can be realized, so that the output or input of the current of the battery cells 10 can be achieved.

[0060] Please refer to again Figure 1 、 Figure 2 and Figure 5 , in some alternative embodiments, a liquid inlet hole 122 and a liquid outlet hole 123 are formed in the pole column 12. The liquid inlet hole 122 and the liquid outlet hole 123 are both communicated with the receiving groove 121, and the liquid inlet hole 122 and the liquid outlet hole 123 extend from the receiving groove 121 to the end face of the pole column 12 facing away from the inside of the housing 111. The battery 1 further includes a liquid inlet pipe 30 and a liquid outlet pipe 50. The liquid inlet pipe 30 and the liquid outlet pipe 50 correspond to the pole column 12 one by one. The liquid inlet pipe 30 and the liquid outlet pipe 50 are both arranged through the bus bar 20 connected to the corresponding pole column 12, and the liquid inlet pipe 30 is communicated with the liquid inlet hole 122 on the corresponding pole column 12, and the liquid outlet pipe 50 is communicated with the liquid outlet hole 123 on the corresponding pole column 12. By arranging the liquid inlet pipe 30 and the liquid outlet pipe 50, the coolant can be circulated and input into the pole column 12, which is beneficial to improving the heat dissipation effect.

[0061] Furthermore, in some alternative embodiments, the liquid inlet pipe 30 and the liquid outlet pipe 50 corresponding to different pole columns 12 and arranged through the same bus bar 20 are communicated to form a communicating pipe 40.

[0062] Specifically, define the two pole columns 12 connected by the bus bar 20 as the first pole column and the second pole column respectively. The liquid inlet pipe 30 arranged through the bus bar 20 and corresponding to the first pole column is communicated with the liquid inlet hole 122 of the first pole column. The liquid outlet pipe 50 arranged through the bus bar 20 and corresponding to the first pole column, and the liquid inlet pipe 30 arranged through the bus bar 20 and corresponding to the second pole column are communicated to form a communicating pipe 40. The liquid outlet pipe 50 arranged through the bus bar 20 and corresponding to the second pole column is communicated with the liquid outlet hole 123 of the second pole column.

[0063] During actual operation, the coolant flows into the receiving groove 121 of the first pole through the liquid inlet pipe 30 corresponding to the first pole, then enters the receiving groove 121 of the second pole through the connecting pipe 40, and finally flows out through the liquid outlet pipe 50 corresponding to the second pole. Under this design, two poles 12 connected by the same bus bar 20 can share the same water path, reducing the arrangement of pipelines and simplifying the structure and manufacturing cost of the battery 1.

[0064] This application also provides an electrical device, which includes the battery 1 described in any one of the above embodiments, and the battery 1 is used to provide electrical energy.

[0065] The battery 1 in this application has the effects described in any one of the above embodiments, so it will not be elaborated here.

[0066] Among them, the electrical device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

[0067] It should be understood that the technical solutions described in the embodiments of this application are not only limited to the electrical devices described above.

[0068] For the above-mentioned battery cell 10, battery 1 and electrical device, by arranging a receiving groove 121 in the pole 12 and introducing a coolant into the receiving groove 121, the coolant can absorb the heat on the pole 12 and the adapter 13 during the operation of the battery cell 10, thereby extending the life of the battery 1 and reducing the risk of thermal runaway.

[0069] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0070] The above-described embodiments only represent several implementation manners of this application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be subject to the appended claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: The housing (11) comprises a shell (111) and an end cover (112), wherein the end cover (112) is provided with a mounting through hole (112a); A pole (12) is inserted into the mounting through hole (112a), and a receiving groove (121) for receiving a coolant is provided in the pole (12), and a notch of the receiving groove (121) is located on the end surface of the pole (12) facing the inside of the housing (111); An electrode assembly, disposed in the housing (111) and comprising a tab; and The adapter (13) is located on a side of the end cover (112) facing the interior of the housing (111), and is electrically connected to both the pole (12) and the pole lug, and the adapter (13) seals the notch of the accommodating groove (121).

2. The battery cell according to claim 1, characterized in that: A liquid inlet hole (122) and a liquid outlet hole (123) are provided in the pole (12); the liquid inlet hole (122) and the liquid outlet hole (123) are both connected to the receiving groove (121); and the liquid inlet hole (122) and the liquid outlet hole (123) extend from the receiving groove (121) to the end surface of the pole (12) facing away from the interior of the shell (111).

3. The battery cell according to claim 1, characterized in that: The adapter (13) is formed with an explosively weak portion; the orthographic projection of the explosively weak portion on the end surface of the pole (12) facing the interior of the housing (111) falls into the notch of the accommodating groove (121).

4. The battery cell according to claim 3, characterized in that: The bursting weak portion is a groove structure, and the groove opening of the groove structure is arranged toward the pole (12).

5. The battery cell according to claim 1, characterized in that: A welding area for welding with the pole (12) is formed on the adapter (13), and the welding area is arranged around the circumference of the notch of the accommodating groove (121).

6. The battery cell according to claim 1, characterized in that: The pole (12) comprises a base (124) and a convex portion (125) protruding from the base (124); the base (124) is located on a side of the end cover (112) facing the interior of the housing (111); the convex portion (125) is penetrated through the mounting through hole (112a); and the accommodating groove (121) extends from the base (124) to the convex portion (125); The cross-sectional area of ​​the receiving groove (121) is S1, the cross-sectional area of ​​a section of the receiving groove (121) formed by the protrusion (125) is S2, and S1 ≥ 10% S2.

7. A battery, characterized in that: The battery comprises: A busbar (20); and As described in any one of claims 1 to 6, the battery cells are in plurality and arranged in a row, and the two poles (12) in two adjacent battery cells arranged in a row are electrically connected via the busbar (20).

8. The battery according to claim 7, characterized in that A liquid inlet hole (122) and a liquid outlet hole (123) are provided in the pole (12); the liquid inlet hole (122) and the liquid outlet hole (123) are both in communication with the receiving groove (121); and the liquid inlet hole (122) and the liquid outlet hole (123) extend from the receiving groove (121) to the end surface of the pole (12) facing away from the interior of the shell (111); The battery further comprises a liquid inlet pipe (30) and a liquid outlet pipe (50), the liquid inlet pipe (30) and the liquid outlet pipe (50) both corresponding to the poles (12) one by one, the liquid inlet pipe (30) and the liquid outlet pipe (50) both passing through the manifold (20) connected to the corresponding pole (12), and the liquid inlet pipe (30) is in communication with the liquid inlet hole (122) on the corresponding pole (12), and the liquid outlet pipe (50) is in communication with the liquid outlet hole (123) on the corresponding pole (12).

9. The battery according to claim 8, characterized in that The liquid inlet pipe (30) and the liquid outlet pipe (50) which are arranged on the same confluence piece (20) and correspond to different poles (12) are connected to form a connecting pipe (40).

10. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 8 or 9, and the battery is used to provide electrical energy.

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