Battery and battery pack

Abstract

The application provides a battery and a battery pack, the battery comprising a shell, a first insulation seal, a pole and a compression ring; the shell is provided with a mounting hole, and a peripheral area of the mounting hole of the shell is sunken to form a placement part, the placement part is lower than an upper surface of the shell, and comprises a first step part and a second step part, the second step part is located on a circumferential outer side of the first step part, and in a height direction of the battery, the second step part is higher than the first step part; the first insulation seal is at least partially arranged above the first step part; the pole is overlapped above the first insulation seal, and an upper surface of the pole is configured to be fixedly connected with a busbar; the compression ring is arranged on a circumferential outer side of the pole, and is partially fixedly connected with an upper surface of the second step part and partially overlapped above the pole; a height difference H between the first step part and the second step part, an extension width A of the first step part and an extension width B of the second step part satisfy 0.2≤(A-B)*H≤9.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery and a battery pack. Background Technology

[0002] In a battery, the terminals are located on the cover assembly and are mainly used to conduct electricity to the external circuit. They are usually made of metal materials with good conductivity. In order to be connected in series or in parallel with other batteries, the terminals are usually electrically connected to other batteries through busbars.

[0003] When the battery vibrates up and down along the height direction, the busbar will repeatedly pull the battery terminals upward and press them downward, causing the battery's housing to connect with the outside world. This may lead to electrolyte leakage and affect the normal operation of the battery. Utility Model Content

[0004] In view of this, the present application aims to provide a battery and battery pack to solve the problem that when existing batteries vibrate up and down along the height direction, the busbar repeatedly pulls the battery terminals upward and presses them downward, causing the battery's housing cavity to communicate with the outside, which may lead to electrolyte leakage and other problems that affect the normal operation of the battery.

[0005] The first aspect of this application provides a battery, comprising:

[0006] The housing has mounting holes and a placement portion that is lower than the upper surface of the housing.

[0007] The terminal post overlaps the upper part of the placement part, and in the height direction of the battery, part of it is disposed in the mounting hole and part of it protrudes upward from the upper surface of the housing. The upper surface of the terminal post is configured to be fixedly connected to the busbar.

[0008] The protrusion height of the upper surface of the pole relative to the upper surface of the housing is A, where A satisfies 0.2≤A≤9, and the unit is mm.

[0009] Another aspect of this application provides a battery pack including at least one battery.

[0010] In the battery of this application embodiment, for the height difference H between the first step and the second step, the extension width A of the first step, and the extension width B of the second step, (AB)*H satisfies 0.2≤(AB)*H≤9. This ensures that when the battery of this application embodiment vibrates up and down along the height direction, and the busbar repeatedly pulls the battery terminal upward and presses the battery terminal downward in the height direction, it can not only prevent the first step from deforming under pressure, but also ensure that the first insulating seal seals the gap between the terminal and the first step, preventing the first insulating seal from failing. It can also ensure that the pressure ring can effectively fix the terminal, preventing the terminal from loosening or shifting relative to the shell. This avoids structural damage to the battery of this application embodiment, prevents safety hazards such as electrolyte leakage, and improves the working safety of the battery of this application embodiment. Attached Figure Description

[0011] Figure 1 A three-dimensional structural schematic diagram of the battery of this application is shown;

[0012] Figure 2 A cross-sectional structural diagram of the battery and busbar of this application is shown;

[0013] Figure 3 This shows another cross-sectional structural schematic diagram of the battery and busbar of this application;

[0014] Figure 4 A cross-sectional structural diagram of the battery of this application is shown.

[0015] Attached image labels:

[0016] 10. Housing; 11. Mounting hole; 12. Placement part; 121. First step part; 122. Second step part; 123. Connecting section; 20. Terminal post; 30. Busbar; 40. Adapter; 51. Cell body; 52. Terminal lug; 60. Pressure ring; 71. First insulating seal; 72. Second insulating seal. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0019] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0020] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0021] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as “when”, “in response to a determination”, or “upper”, “lower”, “front”, “back”, “left”, “right”, etc., are used only to indicate the relative positional relationship between related parts, and not to limit the absolute position of these related parts. In this document, “equal”, “same”, etc., are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0022] like Figures 1 to 4 As shown in the figure, this application provides a battery, which includes at least a housing 10, a terminal post 20, and a pressure ring 60.

[0023] The housing 10 has a mounting hole 11. The area surrounding the mounting hole 11 is recessed to form a placement portion 12. The placement portion 12 is lower than the upper surface of the housing 10 and includes a first step portion 121 and a second step portion 122. The second step portion 122 is located circumferentially outside the first step portion 121, and in the height direction of the battery, the second step portion 122 is higher than the first step portion 121. The upper surface of the terminal post 20 is configured for fixed connection with the busbar 30. It is understood that the aforementioned height direction is the extension direction from the end of the battery in this embodiment where the terminal post 20 is provided to the other end where the terminal post 20 is not provided. The busbar 30 can be fixedly connected to the terminal posts 20 of two different batteries at the same time, so that multiple batteries can be electrically connected in series or parallel to form a battery pack to output electrical energy or to charge it using an external circuit. The housing 10 in this embodiment may include a cover plate, and the terminal post 20 can be fixedly disposed on the cover plate of the battery.

[0024] A retaining ring 60 is disposed on the circumferential outer side of the terminal post 20, and is partially fixedly connected to the upper surface of the second step portion 122, and partially overlaps the top of the terminal post 20. That is, in the battery of this embodiment, a retaining ring 60 is disposed on the circumferential outer side of the terminal post 20, the outer circumferential edge of the retaining ring 60 is fixedly connected to the upper surface of the second step portion 122, and the inner circumferential edge overlaps the top of the terminal post 20. The retaining ring 60 can effectively fix the terminal post 20, prevent the terminal post 20 from loosening or shifting relative to the housing 10, and enhance the structural stability of the battery of this embodiment.

[0025] like Figure 2 As shown, in one embodiment of this application, the battery of this application embodiment further includes a first insulating seal 71, which is at least partially disposed above the first step portion 121, and the terminal post 20 overlaps the top of the first insulating seal 71.

[0026] Since the first insulating seal 71 is at least partially disposed above the first step portion 121, and the electrode post 20 overlaps above the first insulating seal 71, the electrode post 20 can overlap above the first step portion 121 through the first insulating seal 71. The first insulating seal 71 can ensure that the electrode post 20 and the first step portion 121 are kept insulated, avoiding short circuit between the electrode post 20 and the housing 10. It can also seal the gap between the electrode post 20 and the first step portion 121, preventing the battery cavity of this embodiment from communicating with the outside world, thereby preventing electrolyte leakage and preventing external substances such as water and oxygen from entering the battery.

[0027] The height difference between the first step portion 121 and the second step portion 122 in the height direction of the battery is defined as H, in mm; the extension width of the first step portion 121 in the direction perpendicular to the height of the battery is defined as A, in mm, and the extension width of the second step portion 122 in the direction perpendicular to the height of the battery is defined as B, in mm.

[0028] It is understood that when the battery in this embodiment of the application vibrates up and down along the height direction, the two batteries connected by the busbar 30 may not necessarily vibrate synchronously; when the two batteries connected by the busbar 30 do not vibrate synchronously, the busbar 30 will repeatedly pull the battery terminal 20 upward and press the battery terminal 20 downward in the height direction.

[0029] Therefore, when (AB)*H is greater than or equal to 9, when the busbar 30 presses down on the terminal post 20, the first step portion 121 is easily deformed downwards, which causes the first insulating seal 71 to be unable to completely seal the gap between the terminal post 20 and the first step portion 121. This results in the battery's housing cavity communicating with the outside world, which may lead to electrolyte leakage and other issues, affecting the normal operation of the battery in this embodiment.

[0030] When (AB)*H is greater than or equal to 0.2, the edge of the pressure ring 60 overlapping the terminal post 20 has low structural strength. When the busbar 30 pulls the pressure ring 60 upward, the pressure ring 60 is prone to tilting upward, which makes it impossible for the pressure ring 60 to properly fix the terminal post 20. The terminal post 20 is prone to loosening or displacement relative to the housing 10, and may even detach from the housing 10, resulting in structural damage to the battery of this embodiment and electrolyte leakage, which affects the normal operation of the battery of this embodiment.

[0031] Therefore, in the battery of this application embodiment, for the height difference H between the first step portion 121 and the second step portion 122, the extension width A of the first step portion 121, and the extension width B of the second step portion 122, (AB)*H satisfies 0.2≤(AB)*H≤9. This ensures that when the battery of this application embodiment vibrates up and down along the height direction, and the busbar 30 repeatedly pulls the battery terminal 20 upward and presses the battery terminal 20 downward in the height direction, it can not only prevent the first step portion 121 from deforming downward under pressure, ensuring that the first insulating seal 71 seals the gap between the terminal 20 and the first step portion 121 and preventing the insulation seal 71 from failing, but also ensure that the pressure ring 60 can effectively fix the terminal 20, preventing the terminal 20 from loosening or shifting relative to the housing 10, thereby avoiding structural damage to the battery of this application embodiment, preventing safety hazards such as electrolyte leakage, and improving the working safety of the battery of this application embodiment.

[0032] It is understood that, in specific embodiments, the value of (AB)*H can be selected from specific values ​​such as 0.2, 1, 3, 4, 6, and 9; the battery in this application embodiment can be any type of battery, such as lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and is not limited herein.

[0033] In addition to the aforementioned structure, the battery in this embodiment may further include a cell, an electrolyte, and an adapter 40. The housing 10 is used to house the cell and electrolyte. The housing 10 may include a housing body and a cover plate. At least one electrode post 20 is disposed on the housing body and / or the cover plate. The cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and a separator. The separator is located between adjacent positive and negative electrode plates to insulate them. At least one end of the electrode assembly has a tab. One end of the adapter 40 is electrically connected to the tab, and the other end is electrically connected to the electrode post 20. The battery in this embodiment can be of various shapes, such as cylindrical, prismatic, or blade batteries, and is not limited thereto.

[0034] Furthermore, such as Figure 4 As shown, in one embodiment of this application, the extension width A of the first step portion 121 and the extension width B of the second step portion 122 satisfy 1≤AB≤5, with units in mm. When the difference AB between the extension width A of the first step portion 121 and the extension width B of the second step portion 122 satisfies 1≤AB≤5, not only can the strength of the first step portion 121 be further improved, further preventing the first step portion 121 from deforming downwards under pressure, ensuring that the first insulating seal 71 seals the gap between the pole post 20 and the first step portion 121, and preventing insulation failure of the first insulating seal 71, but it can also prevent insufficient support for the pole post 20 due to the extension width A of the first step portion 121 being too short, ensuring that the first step portion 121 can effectively support the pole post 20. In specific embodiments, the value of AB can be selected from specific values ​​such as 1, 3, 4, and 5, and is not limited here.

[0035] Specifically, such as Figure 4As shown, in one embodiment of this application, the extension width A of the first step portion 121 satisfies 3≤A≤8, with units of mm. When the extension width A of the first step portion 121 satisfies 3≤A≤8, it not only prevents the end of the first step portion 121 from deforming downwards under the pressure of the electrode post 20, ensuring that the first insulating seal 71 seals the gap between the electrode post 20 and the first step portion 121 and preventing insulation failure of the first insulating seal 71, but also improves the support strength between the first step portion 121 and the electrode post 20, preventing the electrode post 20 from detaching downwards from the mounting hole 11. When the battery in this embodiment of the application experiences vertical vibration along the height direction, the electrode post 20 can also be stably mounted on the housing 10. In specific embodiments, the value of A can be selected from specific values ​​such as 3, 4, 5, and 8, and is not limited here.

[0036] Specifically, such as Figure 4 As shown, in one embodiment of this application, the extension width B of the second step portion 122 satisfies 2 ≤ B ≤ 5, in mm. When the extension width B of the second step portion 122 satisfies 2 ≤ B ≤ 5, in mm, the overall width of the second step portion 122 can be effectively reduced, decreasing the impact of the second step portion 122 on the overall strength of the housing 10, thereby effectively improving the overall strength of the housing 10 in this embodiment. It can also improve the support strength between the second step portion 122 and the pressure ring 60, preventing the end of the second step portion 122 from deforming downwards under the pressure of the pressure ring 60. When the battery in this embodiment experiences vertical vibration along the height direction, the pressure ring 60 can also be fixedly mounted on the housing 10. In specific embodiments, the value of B can be selected from specific values ​​such as 2, 4, and 5, and is not limited here.

[0037] like Figure 4 As shown, in one embodiment of this application, the height difference H between the first step portion 121 and the second step portion 122 satisfies 0.2≤H≤2.5, with the unit being mm.

[0038] When the height difference H between the first step portion 121 and the second step portion 122 satisfies 0.2≤H≤2.5, deformation between the first step portion 121 and the second step portion 122 can be minimized, ensuring the support strength of the first step portion 121 and maintaining relative fixation between the first step portion 121 and the pole post 20, and sealing the gap between the pole post 20 and the first step portion 121 with the first insulating seal 71. Furthermore, deformation of the portion of the pressure ring 60 overlapping the pole post 20 can be minimized, ensuring that the pressure ring 60 can effectively fix the pole post 20 and prevent loosening or displacement of the pole post 20 relative to the housing 10. In specific embodiments, the value of H can be selected from specific values ​​such as 0.2, 1.4, and 2.5, and is not limited here.

[0039] Furthermore, in one embodiment of this application, the thickness of the second step portion 122 satisfies 0.5≤S≤3, in mm. When the thickness S of the second step portion 122 satisfies 0.5≤S≤3, not only can the overall structural strength of the first step portion 121 and the second step portion 122 be guaranteed, and deformation between the second step portion 122 and the shell 10 be minimized, thus ensuring the supporting strength of the first step portion 121 and the second step portion 122, but the overall thickness of the second step portion 122 can also be effectively reduced to save space.

[0040] Furthermore, in one embodiment of this application, the thickness of the first step portion 121 is less than the thickness of the second step portion 122 in the height direction of the battery. Since there is a height difference between the first step portion 121 and the second step portion 122, the fact that the thickness of the first step portion 121 is less than the thickness of the second step portion 122 allows for a certain distance between the bottom surface of the first step portion 121 and the cell body 51, thereby ensuring that the cell body 51 and the first step portion 121 maintain relative insulation.

[0041] like Figure 2 As shown, in one embodiment of this application, in the height direction of the battery, the second step portion 122 and the portion of the electrode 20 facing the first step portion 121 are not located on the same horizontal plane. Because the second step portion 122 and the portion of the electrode 20 facing the first step portion 121 are not located on the same horizontal plane and are staggered, the leakage path of gas along the portion of the electrode 20 facing the first step portion 121 and then along the upper surface of the second step portion 122 is made more tortuous, thereby effectively increasing the difficulty of gas leakage and thus effectively improving the sealing effect.

[0042] Specifically, such as Figure 2 As shown, in one embodiment of this application, the second step portion 122 may be higher than the portion of the terminal post 20 that is directly opposite the first step portion 121 in the height direction of the battery; while in another embodiment of this application, the second step portion 122 may also be higher than the portion of the terminal post 20 that is directly opposite the first step portion 121 in the height direction of the battery, as long as the two are not located on the same horizontal plane.

[0043] like Figure 4As shown, in one embodiment of this application, the extension width F of the end of the electrode 20 that overlaps the first step 121 in the direction perpendicular to the height of the battery is 0.8≤F≤3, and the unit is mm. When the extension width F of the end of the electrode 20 that overlaps the first step 121 satisfies 0.8≤F≤3, not only can the connection strength between the electrode 20 and the first step 121 be guaranteed, thereby increasing the pressure that the electrode 20 can withstand and preventing the electrode 20 from bending the first step 121 downwards, but the overall width of the electrode 20 can also be effectively reduced, thereby saving the space occupied by the electrode 20 on the plane of the housing 10 and leaving space for other structures. In specific embodiments, the value of F can be selected from specific values ​​such as 0.8, 1.4, 2.5, and 3, and is not limited here.

[0044] like Figure 2 and Figure 3 As shown, a connecting section 123 is provided between the first stepped portion 121 and the second stepped portion 122, and the connecting section 123 is used to connect the first stepped portion 121 and the second stepped portion 122. The first stepped portion 121, the connecting section 123, and the second stepped portion 122 can be integrally connected. Figure 2 and Figure 3 As shown, in one embodiment of this application, a gap is provided between the electrode post 20 and the second step portion 122 in a cross-section along the height direction of the battery. Because of the gap between the electrode post 20 and the second step portion 122, when the battery of this embodiment experiences vibration perpendicular to the height direction, collisions between the electrode post 20 and the second step portion 122 can be avoided, thereby preventing deformation of the second step portion 122 due to the impact of the electrode post 20 and ensuring the structural stability of the battery of this embodiment.

[0045] In one embodiment of this application, in the height direction of the battery, the lower surface of the terminal post 20 is located above the lower surface of the placement portion 12; or, in the height direction of the battery, the lower surface of the terminal post 20 is flush with the lower surface of the placement portion 12. That is, in the battery of this application embodiment, the terminal post 20 does not protrude downward relative to the placement portion 12, and the overall height of the terminal post 20 and its housing 10 in the height direction of the battery of this application embodiment is low, thereby reducing the height of the battery of this application embodiment, saving the space occupied by the battery in the height direction, thereby increasing the energy density of the battery, and shortening the current path of the battery corresponding to the terminal post 20 portion of the battery of this application embodiment, reducing the battery resistance, and improving the charging efficiency.

[0046] In another embodiment of this application, such as Figure 2As shown, in one embodiment of this application, the lower surface of the terminal post 20 is located below the lower surface of the placement portion 12 in the height direction of the battery. That is, in the battery of this embodiment, the terminal post 20 protrudes downward relative to the placement portion 12, which not only facilitates the fixed connection between the terminal post 20 and the tab 52 or the adapter 40, but also allows for a certain distance between the cell body 51 and the placement portion 12, thereby ensuring that the cell body 51 and the placement portion 12 can maintain relative insulation.

[0047] like Figure 4 As shown, in one embodiment of this application, the height difference between the lower surface of the terminal post 20 and the lower surface of the placement portion 12 in the height direction of the battery is G, where G≤2, in mm. Since the height difference G≤2mm between the lower surface of the terminal post 20 and the lower surface of the placement portion 12 in the height direction of the battery can effectively shorten the overall height of the terminal post 20, thereby saving space occupied by the terminal post 20 in the height direction, increasing the energy density of the battery, and shortening the current path of the terminal post 20. In specific embodiments, the value of G can be selected from specific values ​​such as 0.8, 1.4, and 2, and is not limited here.

[0048] like Figure 2 As shown, in one embodiment of this application, the battery further includes a second insulating seal 72. The second insulating seal 72 is disposed between the terminal post 20 and the pressure ring 60, and is at least partially located above the terminal post 20. The pressure ring 60 can overlap the terminal post 20 via the second insulating seal 72. The second insulating seal 72 not only ensures insulation between the terminal post 20 and the pressure ring 60, preventing short circuits between them, but also further seals the gap between the terminal post 20 and the pressure ring 60, further preventing electrolyte leakage and preventing external substances such as water and oxygen from entering the battery.

[0049] The separate arrangement of the first insulating seal 71 and the second insulating seal 72 can effectively reduce the processing difficulty of the first insulating seal 71 and the second insulating seal 72 and improve the processing yield of the first insulating seal 71 and the second insulating seal 72.

[0050] like Figure 4 As shown, in one embodiment of this application, the battery of this application embodiment further includes a cell assembly. The housing 10 forms a receiving cavity, the cell assembly is disposed in the receiving cavity, and includes an integrally connected cell body 51 and a tab 52. In the height direction of the battery, the distance between the upper end face of the cell body 51 and the first step portion 121 is D, where D satisfies 3≤D≤8, and the unit is mm.

[0051] Since the distance D between the upper surface of the cell body 51 and the first step portion 121 in the height direction of the battery is 3≤D≤8, this not only ensures a certain distance between the cell body 51 and the first step portion 121, thereby ensuring relative insulation between them, but also prevents the tab 52 from extending too far in the height direction of the battery in this embodiment. This shortens the current path of the corresponding tab 52 portion of the battery in this embodiment, reduces battery resistance, and improves the charging efficiency of the battery in this embodiment. In specific embodiments, the value of D can be selected from specific values ​​such as 3, 5, and 8, and is not limited here.

[0052] Specifically, such as Figure 2 As shown, in one embodiment of this application, the tab 52 is configured to be fixedly connected to the lower end face of the terminal post 20 and electrically connected to the terminal post 20. That is, in the battery of this application embodiment, the tab 52 and the terminal post 20 are directly fixedly connected, thereby further shortening the overall current path of the battery of this application embodiment, reducing the battery resistance, and improving the charging efficiency of the battery.

[0053] And such Figure 3 As shown, in one embodiment of this application, the battery of this application embodiment further includes an adapter 40; the adapter 40 is configured to be fixedly connected to the lower end surface of the terminal post 20, and the tab 52 is configured to be fixedly connected to the adapter 40 so as to be electrically connected to the terminal post 20 through the adapter 40.

[0054] This application also provides a battery pack, which includes at least one of the aforementioned batteries. It is understood that in one embodiment of this application, the battery pack may include at least one battery module, which includes at least one of the aforementioned batteries; in another embodiment of this application, the battery pack may be directly composed of at least one of the aforementioned batteries and other necessary devices.

[0055] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

[0056] Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A battery, characterized in that, include: The housing (10) has a mounting hole (11) and the area around the mounting hole (11) of the housing (10) is recessed to form a placement part (12). The placement part (12) is lower than the upper surface of the housing (10) and includes a first step part (121) and a second step part (122). The second step part (122) is located circumferentially outside the first step part (121), and in the height direction of the battery, the second step part (122) is higher than the first step part (121). A pole post (20), the upper surface of which is configured for fixed connection with a busbar (30); A pressure ring (60) is disposed on the circumferential outer side of the pole post (20) and is partially fixedly connected to the upper surface of the second step portion (122) and partially overlaps the top of the pole post (20). In the height direction of the battery, the height difference between the first step (121) and the second step (122) is H, in mm; in the direction perpendicular to the height of the battery, the extension width of the first step (121) is A, in mm, and the extension width of the second step (122) is B, in mm; (AB)*H satisfies 0.2≤(AB)*H≤9.

2. The battery according to claim 1, characterized in that, The extension width A of the first step portion (121) and the extension width B of the second step portion (122) satisfy 1≤AB≤5, in mm.

3. The battery according to claim 1, characterized in that, The extension width A of the first step (121) satisfies 3≤A≤8, in mm.

4. The battery according to claim 1, characterized in that, The extension width B of the second step (122) satisfies 2≤B≤5, in mm.

5. The battery according to claim 1, characterized in that, The height difference H between the first step (121) and the second step (122) satisfies 0.2≤H≤2.5, in mm.

6. The battery according to claim 1, characterized in that, In the height direction of the battery, the thickness of the second step (122) is S, where S satisfies 0.5≤S≤3, and the unit is mm.

7. The battery according to claim 1, characterized in that, In the height direction of the battery, the thickness of the first step portion (121) is less than the thickness of the second step portion (122).

8. The battery according to claim 1, characterized in that, In the height direction of the battery, the second step portion (122) and the portion of the pole post (20) opposite the first step portion (121) are not located on the same horizontal plane.

9. The battery according to claim 1, characterized in that, In the direction perpendicular to the height of the battery, the extension width of the end of the pole post (20) that overlaps the first step portion (121) is F, where F satisfies 0.8≤F≤3, and the unit is mm.

10. The battery according to claim 1, characterized in that, In a cross-section along the height direction of the battery, a gap is provided between the pole post (20) and the second step portion (122).

11. The battery according to claim 1, characterized in that, In the height direction of the battery, the lower surface of the pole (20) is located above the lower surface of the placement part (12); Alternatively, in the height direction of the battery, the lower surface of the pole (20) is flush with the lower surface of the placement part (12).

12. The battery according to claim 1, characterized in that, In the height direction of the battery, the lower surface of the terminal post (20) is located below the lower surface of the placement part (12).

13. The battery according to claim 12, characterized in that, In the height direction of the battery, the height difference between the lower surface of the pole post (20) and the lower surface of the placement part (12) is G, G≤2, in mm.

14. The battery according to claim 1, characterized in that, It also includes a battery cell assembly, wherein the housing (10) forms a receiving cavity, the battery cell assembly is disposed in the receiving cavity, and includes an integrally connected battery cell body (51) and electrode tab (52); In the height direction of the battery, the distance between the upper end face of the cell body (51) and the first step portion (121) is D, where D satisfies 3≤D≤8, and the unit is mm.

15. The battery according to claim 14, characterized in that, The tab (52) is configured to be fixedly connected to the lower end face of the pole post (20) and electrically connected to the pole post (20).

16. The battery according to any one of claims 1 to 15, characterized in that, It also includes a first insulating seal (71), which is at least partially disposed above the first step portion (121); the pole post (20) overlaps above the first insulating seal (71).

17. A battery pack, characterized in that, It includes at least one battery according to any one of claims 1 to 16.

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