Battery and battery pack

Abstract

The application provides a battery and a battery pack, the battery comprising a shell, a pole assembly, a cell assembly and a limiting piece; one end of the shell in a first direction is provided with an open end, and a containing cavity is surrounded; the pole assembly is fixedly arranged at the open end of the shell, and is provided with a through hole facing the containing cavity; the cell assembly is arranged in the containing cavity, and comprises an integrated cell body and a tab, the tab is arranged at one end of the cell body adjacent to the pole assembly, and is configured to pass through the through hole from the cell body and be electrically connected with the pole assembly; the limiting piece is abutted between the cell body and the inner wall of the shell, and is configured to limit the cell body; in the first direction, the overlapping height of the limiting piece and the cell body is h, the thickness of the tab located in the through hole is M, and the width of the through hole in the thickness direction corresponding to the tab is L, (L-M) / h satisfies 0.5≤(L-M) / h≤4.

Description

Technical Field

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

[0002] In cylindrical batteries and similar types of batteries, the terminal assembly is used to conduct electricity to the external circuit. It is usually made of a metal material with good conductivity and is electrically connected to the tabs of the positive or negative electrode.

[0003] Specifically, the terminal assembly includes a terminal and an adapter, with a through hole on the adapter; during battery assembly, the tab needs to pass through the through hole on the adapter and be electrically connected to the terminal or the adapter.

[0004] However, in the actual assembly process, the position of the tab is prone to deviation, resulting in misalignment with the via and making assembly difficult; if the tab is misaligned with the via, it cannot be assembled normally; if the tab is too close to the wall of the via, the tab is prone to rubbing against the wall of the terminal hole during assembly, generating metal debris, which can easily enter the cell and pose a risk of short circuit.

[0005] To ensure alignment between the tabs and the vias, a limiting component is usually required between the cell and the casing. However, the limiting component can affect the cell's heat dissipation and expansion, and may also pose a safety risk. Utility Model Content

[0006] In view of this, the embodiments of this application aim to provide a battery and battery pack to solve the problems in existing batteries where the tabs are prone to friction with the wall of the terminal hole, generating metal debris, which can easily enter the battery cell and cause a short circuit. In addition, the limiting components can affect the heat dissipation and expansion of the battery cell, which can easily cause safety risks.

[0007] The first aspect of this application provides a battery, comprising:

[0008] The housing has an open end in a first direction and forms a receiving cavity; the pole assembly is fixedly disposed at the open end of the housing and has a through hole facing the receiving cavity.

[0009] A battery cell assembly is disposed within the receiving cavity and includes an integrally connected battery cell body and a tab. The tab is disposed at one end of the battery cell body adjacent to the terminal assembly and is configured to pass through the through hole from the battery cell body and be electrically connected to the terminal assembly.

[0010] A limiting member abuts between the cell body and the inner wall of the housing, and is configured to limit the cell body.

[0011] Wherein, in the first direction, the overlap height between the limiting member and the battery cell body is h, in mm; the thickness of the tab inside the through hole is M, in mm; the width of the through hole in the thickness direction corresponding to the tab is L, in mm; and (LM) / h satisfies 0.5≤(LM) / h≤4.

[0012] Another aspect of this application provides a battery pack including at least one battery.

[0013] In the battery of this application embodiment, when the overlap height h between the limiting member and the cell body, the thickness M of the tab within the through hole, and the width L of the through hole corresponding to the tab in the thickness direction satisfy 0.5≤(LM) / h≤4, it can not only ensure the alignment between the tab and the terminal assembly as much as possible during the battery assembly process, avoiding collisions between the tab and the through hole during assembly, thereby effectively preventing local damage to the tab due to collisions and preventing short circuits inside the cell body, but also effectively save the space occupied by the limiting member, improve the energy density of the battery of this application embodiment, and reduce the impact of the limiting member on the heat dissipation process of the cell body, preventing the limiting member from causing deformation or cracking of the cell body, thus effectively improving the working safety of the battery of this application embodiment. Attached Figure Description

[0014] Figure 1 A three-dimensional structural schematic diagram of the battery of this application is shown;

[0015] Figure 2 A cross-sectional structural diagram of the battery of this application is shown;

[0016] Figure 3 for Figure 2 A partially enlarged schematic diagram;

[0017] Figure 4 A three-dimensional structural schematic diagram of the adapter of this application is shown;

[0018] Figure 5 This shows another cross-sectional structural schematic diagram of the battery of this application;

[0019] Figure 6 A cross-sectional structural schematic diagram of the adapter of this application is shown.

[0020] Attached image labels:

[0021] 10. Housing; 20. Terminal assembly; 21. Terminal body; 22. Adapter; 221. Connecting part; 222. Upper protective layer; 223. Side protective layer; 23. Through hole; 30. Cell assembly; 31. Cell body; 32. Tab; 321. Welding part; 40. Limiting component.

[0022] Z: Altitude direction. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] like Figures 1 to 6 As shown in the figure, this application provides a battery, which includes a housing 10, an electrode assembly 20, a cell assembly 30, and a limiting member 40.

[0029] The housing 10 has an open end in the first direction and forms a receiving cavity, which is used to accommodate the battery structure such as the cell assembly 30 and electrolyte.

[0030] The terminal assembly 20 is fixedly disposed at the open end of the housing 10. The terminal assembly 20 is used to connect to an external circuit so that the battery of this embodiment can output electrical energy to the outside, or the external circuit can charge the battery of this embodiment. The terminal assembly 20 can prevent the housing cavity from communicating with the outside, prevent electrolyte leakage, and prevent problems such as battery short circuits that could cause safety hazards. It can also prevent external substances such as water and oxygen from entering the battery, so as to ensure the normal operation of the battery of this embodiment.

[0031] It is understood that the aforementioned first direction refers to the extension direction from one end of the battery in this embodiment of the application where the terminal assembly 20 is provided to the other end where the terminal assembly is not provided. The battery in this embodiment of the application can be a battery of various shapes, such as cylindrical battery, prismatic battery, blade battery, etc., and is not limited thereto.

[0032] like Figures 2 to 4As shown, in the battery of this embodiment, the terminal assembly 20 has a through hole 23 facing the receiving cavity; the cell assembly 30 includes a cell body 31 and a tab 32 integrally connected. The tab 32 is disposed at one end of the cell body 31 adjacent to the terminal assembly 20 and is configured to pass through the through hole 23 from the cell body 31 and be electrically connected to the terminal assembly 20. Specifically, during the assembly process of the battery of this embodiment, the tab 32 needs to pass through the through hole 23 on the terminal assembly 20 and be electrically connected to the terminal assembly 20. Specifically, the tab 32 and the terminal assembly 20 can be electrically connected by welding or other methods, which are not limited here.

[0033] In the assembly and operation of the battery in this application embodiment, in order to avoid collisions and friction between the cell body 31 of the cell assembly 30 and the housing 10, and between the tab 32 and the terminal assembly 20, the battery in this application embodiment also includes a limiting member 40. The limiting member 40 abuts between the cell body 31 and the inner wall of the housing 10 and is configured to limit the cell body 31.

[0034] By setting a limiting member 40 between the cell body 31 and the inner wall of the housing 10, the position of the cell body 31 in the receiving cavity can be effectively limited. This ensures that the tab 32 can be aligned with the through hole 23 during assembly, and then, under the control of the assembly equipment, it passes through the through hole 23 and is electrically connected to the terminal assembly 20, thus avoiding collision between the tab 32 and the through hole 23 of the terminal assembly 20.

[0035] Among them, such as Figure 3 As shown, in the first direction, the overlap height between the limiting member 40 and the cell body 31 is h, in mm; the thickness of the tab 32 located in the through hole 23 is M, in mm; the width of the through hole 23 in the thickness direction corresponding to the tab 32 is L, in mm; and (LM) / h satisfies 0.5≤(LM) / h≤4.

[0036] When (LM) / h is less than 0.5, the tab 32 is prone to collision with the through hole 23 during assembly, resulting in metal debris. This metal debris enters the cell body 31, which can easily cause a short circuit risk. When (LM) / h is greater than 4, the limiting member 40 needs to occupy too much space in the first direction of the battery's receiving cavity in this embodiment, affecting the energy density of the battery in this embodiment. It will also affect the heat dissipation of the cell body 31 in this embodiment during operation. Furthermore, when the cell body 31 at the position corresponding to the limiting member 40 expands, the limiting member 40 can easily cause an increase in pressure at the corresponding cell body 31, which can lead to deformation and cracking of the cell body 31, and may even result in cracking of the battery casing 10, electrolyte leakage, and battery damage.

[0037] Therefore, in the battery of this application embodiment, when the overlap height h between the limiting member 40 and the cell body 31, the thickness M of the tab 32 within the through hole 23, and the width L of the through hole 23 corresponding to the tab 32 in the thickness direction satisfy 0.5≤(LM) / h≤4, it can not only ensure the alignment between the tab 32 and the terminal assembly 20 as much as possible during the battery assembly process, avoiding collisions between the tab 32 and the through hole 23 during the assembly process, thereby effectively preventing local damage to the tab 32 due to collisions and preventing short circuits inside the cell body 31, it can also effectively save the space occupied by the limiting member 40, improve the energy density of the battery of this application embodiment, and reduce the impact of the limiting member 40 on the heat dissipation process of the cell body 31, preventing the limiting member 40 from causing deformation or breakage of the cell body 31, thus effectively improving the working safety of the battery of this application embodiment.

[0038] It is understood that, in specific embodiments, the value of (LM) / h can be selected from specific values ​​such as 0.5, 1, 2, 3, 4, etc., and is not limited here.

[0039] like Figure 3 As shown, in one embodiment of this application, the thickness M of the tab 32 within the via 23 and the width L of the via 23 corresponding to the thickness of the tab 32 in the thickness direction satisfy 1 ≤ (LM) ≤ 9, in mm. It is understood that when (LM) is less than 1, the tab 32 is prone to collision with the via 23 during assembly, generating metal debris. This metal debris entering the cell body 31 can easily lead to a short circuit risk. Conversely, when (LM) is greater than 9, it can easily affect the structural strength of the entire terminal assembly 20.

[0040] Therefore, in the battery of this application embodiment, when the thickness M of the tab 32 within the through hole 23 and the width L of the through hole 23 corresponding to the tab 32 in the thickness direction satisfy 1 ≤ (LM) ≤ 9, it is possible not only to ensure the alignment between the tab 32 and the terminal assembly 20 during battery assembly, avoiding collisions between the tab 32 and the through hole 23 during assembly, thus effectively preventing local damage to the tab 32 due to collisions and preventing short circuits inside the cell body 31, but also to effectively ensure the structural strength of the entire terminal assembly 20. It is understood that the range of the width L of the through hole 23 corresponding to the tab 32 in the thickness direction can be 2 ≤ L ≤ 10, and the range of the thickness M of the tab 32 within the through hole 23 can be 0.5 ≤ M ≤ 2, thereby ensuring that the thickness M of the tab 32 within the through hole 23 and the width L of the through hole 23 corresponding to the tab 32 in the thickness direction satisfy the condition 1 ≤ (LM) ≤ 9. In specific embodiments, the value of (LM) can be selected from specific values ​​such as 1, 4, 5, and 9, and is not limited here.

[0041] like Figure 3 As shown, in one embodiment of this application, the overlap height h between the limiting member 40 and the battery cell body 31 satisfies 2≤h≤8, with the unit being mm.

[0042] It is understandable that when h is less than 8, the limiting effect of the limiting member 40 on the cell body 31 is poor, and the cell body 31 is prone to shifting relative to its reference position, which in turn causes the tab 32 to be unable to align with the through hole 23, thus easily causing the tab 32 to collide with the through hole 23 during assembly. When h is greater than 2, the limiting member 40 needs to occupy too much space in the first direction of the battery's receiving cavity in this embodiment, affecting the energy density of the battery in this embodiment, and also affecting the heat dissipation of the cell body 31 during operation. Furthermore, when the cell body 31 at the position corresponding to the limiting member 40 expands, the limiting member 40 is prone to causing an increase in pressure at the corresponding cell body 31, which in turn causes the cell body 31 to deform or crack, and may even lead to the battery casing 10 cracking, electrolyte leakage, battery damage, etc.

[0043] Therefore, in the battery of this application embodiment, when the overlap height h between the limiting member 40 and the cell body 31 satisfies 2≤h≤8, it can not only effectively ensure the limiting effect of the limiting member 40 on the cell body 31, thereby ensuring the alignment between the tab 32 and the terminal assembly 20 during battery assembly, avoiding collisions between the tab 32 and the through hole 23 during assembly, thus effectively preventing local damage to the tab 32 due to collisions and preventing short circuits inside the cell body 31, it can also effectively save the space occupied by the limiting member 40, improve the energy density of the battery of this application embodiment, and reduce the impact of the limiting member 40 on the heat dissipation process of the cell body 31, preventing deformation or breakage of the cell body 31 caused by the limiting member 40, effectively improving the working safety of the battery of this application embodiment. In specific embodiments, the value of h can be selected from specific values ​​such as 2, 4, 5, 8, etc., and is not limited here.

[0044] In one embodiment of this application, the limiting member 40 is an insulating adhesive layer or an insulating pad to ensure relative insulation between the housing 10 and the cell body 31. It is understood that when the limiting member 40 is an insulating adhesive layer, it not only ensures relative insulation between the housing 10 and the cell body 31 but also bonds and fixes them together, thereby further ensuring the cell is in its reference position. When the limiting member 40 is an insulating pad, it also ensures relative insulation between the housing 10 and the cell body 31, and the limiting member 40 can be manufactured separately, making installation more convenient.

[0045] like Figure 3 and Figure 4As shown, in one embodiment of this application, the terminal assembly 20 includes a terminal body 21 and an adapter 22; the adapter 22 is fixedly disposed at the open end of the housing 10, and one end has a terminal mounting hole, while the other end has a through hole 23; the terminal body 21 is fixedly disposed on the terminal mounting hole. That is, during the operation of the battery in this embodiment, the terminal body 21 is used for electrical connection with an external circuit, and the adapter 22 is used for fixed installation of the terminal body 21.

[0046] like Figure 3 As shown, in one embodiment of this application, the adapter 22 is electrically connected to the electrode post; the adapter 22 includes a connecting portion 221, which forms a through hole 23, and the electrode tab 32 is configured to be fixedly connected to the connecting portion 221 on the side away from the battery cell body 31 by welding.

[0047] In the operation of the battery according to this embodiment, the tab 32 is electrically connected to the adapter 22, and then electrically connected to the external circuit through the terminal body 21. In the assembly process of the battery according to this embodiment, the tab 32 is controlled by the assembly equipment to pass through the through hole 23 and then welded to the side of the connection part 221 away from the cell body 31.

[0048] Furthermore, in one embodiment of this application, the distance between the welded portion 321 between the tab 32 and the connecting portion 221 and the through hole 23 is d, where d satisfies 3 ≤ d, and the unit is mm. When the distance d between the welded portion 321 between the tab 32 and the connecting portion 221 and the through hole 23 is ≥ 3 mm, not only can the welding stress generated after the tab 32 and the connecting portion 221 be prevented from affecting the shape of the connecting portion 221 near the through hole 23, but it can also ensure that the portion of the tab 32 between the welded portion 321 and the through hole 23 has room for upward movement. Therefore, under the condition of vertical vibration of the battery in this embodiment of the application, the collision between the tab 32 and the connecting portion 221 can be effectively reduced, and the tab 32 can be prevented from being damaged locally due to collision. In specific embodiments, the value of d can be selected from specific values ​​such as 3, 4, 5, 8, etc., and is not limited here.

[0049] In another embodiment of this application, the tab 32 is configured to be fixedly connected to the lower end face of the terminal body 21 by welding. That is, during the operation of the battery in this embodiment, the tab 32 is electrically connected to the terminal body 21, and then electrically connected to the external circuit through the terminal. During the assembly process of the battery in this embodiment, the tab 32 is controlled by the assembly equipment to pass through the through hole 23 and then welded to the lower end face of the terminal body 21.

[0050] like Figure 6As shown, in one embodiment of this application, an upper protective layer 222 is provided on the side of the connection portion 221 away from the battery cell body 31, and the upper protective layer 222 is configured to extend from the edge of the via 23 in a direction away from the via 23. The extension distance of the upper protective layer 222 is T, where T satisfies 1≤T≤3, and the unit is mm.

[0051] By providing an upper protective layer 222 on the side of the connection portion 221 away from the battery cell body 31, the collision and friction between the tab 32 and the connection portion 221 can be effectively reduced, further preventing local damage to the tab 32 due to collision. Since the extension distance T of the upper protective layer 222 from the edge of the via 23 in the direction away from the via 23 satisfies 1≤T≤3, it not only effectively ensures the protective effect of the upper protective layer 222 but also prevents mutual interference between the upper protective layer 222 and the welding portion 321. In specific embodiments, the value of T can be selected from specific values ​​such as 1, 1.5, 2, and 3, and is not limited here.

[0052] like Figure 6 As shown, in one embodiment of this application, a side protective layer 223 is provided on at least the area of ​​the connecting portion 221 that serves as the wall of the through hole 23. Since the side protective layer 223 is provided on at least the area of ​​the connecting portion 221 that serves as the wall of the through hole 23, during the battery assembly process of this embodiment, when the tab 32 is controlled by the assembly equipment to pass through the through hole 23, and the tab 32 collides with the area of ​​the connecting portion 221 that serves as the wall of the through hole 23, the side protective layer 223 can effectively reduce the collision and friction between the tab 32 and the area of ​​the connecting portion 221 that serves as the wall of the through hole 23, further preventing local damage to the tab 32 due to collision.

[0053] Furthermore, such as Figure 6 As shown, in one embodiment of this application, a side protective layer 223 is provided on the area of ​​the adapter 22 that serves as the wall of the through hole 23. Since the side protective layer 223 covers the area of ​​the adapter 22 that serves as the wall of the through hole 23, when the tab 32 is controlled by the assembly equipment passing through the through hole 23 and collides with the wall of the through hole 23, the side protective layer 223 can effectively reduce the collision and friction between the tab 32 and the wall of the through hole 23, further preventing local damage to the tab 32 due to collision. Specifically, to ensure the protective effect of the side protective layer 223, during the processing of the side protective layer 223, it is necessary to ensure that the side protective layer 223 covers the bottom corner of the wall of the through hole 23.

[0054] like Figure 4 As shown, in one embodiment of this application, in a cross-section of the adapter 22 perpendicular to the battery height direction, the through hole 23 is an opening that does not penetrate the adapter 22. Specifically, the through hole 23 can be as follows: Figure 4The shape shown is a semicircle, but it can also be a rectangle, trapezoid, or other shapes; there are no restrictions here.

[0055] Furthermore, such as Figure 5 As shown, in one embodiment of this application, on the cross-section of the adapter 22 perpendicular to the height direction of the battery, along the extension direction of the tab 32, the extension length of the through hole 23 is J, in mm, and the extension length of the tab 32 is K, in mm, where J and K satisfy 2≤JK≤10, in mm.

[0056] Since the difference JK between the extension length J of the via 23 and the extension length K of the tab 32 along the extension direction of the tab 32 satisfies 2≤JK≤10, it can not only ensure that there is sufficient distance between the two edges of the tab 32 and the via 23 in the extension direction of the tab 32, thereby avoiding collision between the two edges of the tab 32 and the via 23 during the assembly process, and further avoid damage to the two edges of the tab 32 due to collision, but also avoid the via 23 occupying too much space along the extension direction of the tab 32 on the cross-section of the adapter 22 perpendicular to the battery height direction, effectively saving the overall length of the adapter 22.

[0057] It is understood that, on the cross-section of the adapter 22 perpendicular to the battery height direction, along the extension direction of the tab 32, the extension length J of the through hole 23 can be in the range of 10≤J≤40, and the extension length K of the tab 32 can be in the range of 8≤K≤35, so that JK satisfies the condition 2≤JK. In specific embodiments, the value of JK can be selected from specific values ​​such as 2, 4, 6, 10, etc., and is not limited here.

[0058] In another embodiment of this application, in the cross-section of the adapter 22 perpendicular to the battery height direction, the through hole 23 is a through hole penetrating the adapter 22. Since the through hole 23 is a through hole penetrating the adapter 22 in the cross-section perpendicular to the battery height direction, collisions between the two edges of the tab 32 and the through hole 23 can be completely avoided during assembly, thereby preventing damage to the two edges of the tab 32 due to collisions.

[0059] like Figure 3 As shown, in one embodiment of this application, the cell body 31 is cylindrical, and a limiting member 40 is disposed on the circumferential outer side of the cell body 31 on a cross-section perpendicular to the height of the battery. That is, for a cylindrical battery, the cell body 31 is cylindrical. Since the limiting member 40 is disposed on the circumferential outer side of the cell body 31 on a cross-section perpendicular to the height of the battery, the limiting member 40 can effectively limit the position of the cylindrical cell body 31 within the cylindrical receiving cavity, thereby ensuring that the tab 32 can be aligned with the through hole 23 during assembly, and avoiding collision between the tab 32 and the through hole 23 of the terminal assembly 20 during assembly.

[0060] In another embodiment of this application, on a cross-section of the battery perpendicular to the battery height direction, the limiting member 40 is disposed on both sides of the length direction of the cell body 31; and / or, the cell body 31 is cubic in shape, and on a cross-section of the battery perpendicular to the battery height direction, the limiting member 40 is disposed on both sides of the width direction of the cell body 31.

[0061] For a prismatic battery, the cell body 31 is cubic in shape. On a cross-section perpendicular to the battery's height, limiting members 40 positioned on both sides of the cell body 31 along its length effectively limit the position of the cubic cell body 31 within the cubic cavity along its length. Similarly, limiting members 40 positioned on both sides of the cell body 31 along its width effectively limit its position within the cubic cavity along its width. This ensures that the tabs 32 are aligned with the through-holes 23 during assembly, preventing collisions between the tabs 32 and the through-holes 23 of the terminal assembly 20. It is understood that the limiting members 40 positioned on both sides of the cell body 31 along its length and width can be provided individually or simultaneously.

[0062] In another embodiment of this application, the cell body 31 is cubic in shape, and on the cross-section of the battery perpendicular to the height direction of the battery, the limiting member 40 is L-shaped and is wrapped around the four corners of the cell body 31.

[0063] For a prismatic battery, the cell body 31 is cubic in shape. On the cross-section of the battery perpendicular to its height, the limiting member 40 is L-shaped and is wrapped around the four corners of the cell body 31. The limiting member 40 can simultaneously determine the position of the cubic cell body 31 in both the length and width directions within the cubic cavity. This further ensures that the tab 32 can be aligned with the through hole 23 during assembly, preventing the tab 32 from colliding with the through hole 23 of the terminal assembly 20 during assembly.

[0064] In one embodiment of this application, on the cross-section of the battery along the height direction, the limiting member 40 is fitted to the upper edge of the cell body 31, and the upper width of the limiting member 40 is greater than the lower width.

[0065] Since the tab 32 extends upward from the top of the cell body 31, when the limiting member 40 is attached to the upper edge of the cell body 31, it can effectively limit the position of the upper edge of the cell body 31, and thus limit the position of the tab 32, aligning the tab 32 with the through hole 23. Since the upper width of the limiting member 40 is greater than the lower width, the limiting member 40 can limit the cell body 31 while reducing the pressure on the middle area of ​​the cell body 31, preventing the cell body 31 from deforming or cracking due to the pressure of the limiting member 40, thereby ensuring that the battery in this embodiment can work normally.

[0066] 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.

[0067] 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.

[0068] 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 an open end in a first direction and forms a receiving cavity; The pole assembly (20) is fixedly disposed at the open end of the housing (10) and is provided with a through hole (23) facing the receiving cavity; A battery cell assembly (30) is disposed within the receiving cavity and includes an integrally connected battery cell body (31) and a tab (32). The tab (32) is disposed at one end of the battery cell body (31) adjacent to the terminal assembly (20) and is configured to pass through the through hole (23) from the battery cell body (31) and be electrically connected to the terminal assembly (20). A limiting member (40) abuts between the cell body (31) and the inner wall of the housing (10) and is configured to limit the cell body (31); In the first direction, the overlap height between the limiting member (40) and the battery cell body (31) is h, in mm; the thickness of the tab (32) located in the through hole (23) is M, in mm; the width of the through hole (23) in the thickness direction corresponding to the tab (32) is L, in mm; and (LM) / h satisfies 0.5≤(LM) / h≤4.

2. The battery according to claim 1, characterized in that, The thickness M of the tab (32) within the via (23) and the width L of the via (23) in the thickness direction corresponding to the tab (32) satisfy 1≤(LM)≤9, in mm.

3. The battery according to claim 1, characterized in that, The width L of the via (23) in the thickness direction corresponding to the tab (32) satisfies 2≤L≤10, with the unit being mm.

4. The battery according to claim 1, characterized in that, The thickness M of the tab (32) located within the through hole (23) satisfies 0.5≤M≤2, in mm.

5. The battery according to claim 1, characterized in that, The overlap height h between the limiting member (40) and the battery cell body (31) satisfies 2≤h≤8, with the unit being mm.

6. The battery according to claim 1, characterized in that, The pole assembly (20) includes a pole body (21) and an adapter (22); the adapter (22) is fixedly disposed at the open end of the housing (10), and one end is provided with a pole mounting hole, and the other end is provided with the through hole (23); the pole body (21) is fixedly disposed on the pole mounting hole.

7. The battery according to claim 6, characterized in that, The adapter (22) is electrically connected to the pole; The adapter (22) includes a connecting part (221) which participates in forming the through hole (23), and the tab (32) is configured to be fixedly connected to the connecting part (221) on the side away from the cell body (31) by welding. The distance between the welding part (321) between the electrode tab (32) and the connecting part (221) and the through hole (23) is d, where d satisfies 3≤d, and the unit is mm.

8. The battery according to claim 7, characterized in that, The connecting part (221) is provided with an upper protective layer (222) on the side away from the battery cell body (31), and the upper protective layer (222) is configured to extend from the edge of the via (23) in a direction away from the via (23). The extension distance of the upper protective layer (222) is T, where T satisfies 1≤T≤3, and the unit is mm.

9. The battery according to claim 7, characterized in that, A side protective layer (223) is provided on at least the area of ​​the connecting part (221) that serves as the hole wall of the through hole (23).

10. The battery according to claim 9, characterized in that, The adapter (22) is covered with the side protective layer (223) in the area that serves as the hole wall of the via (23).

11. The battery according to claim 6, characterized in that, On the cross-section of the adapter (22) perpendicular to the height direction of the battery, the through hole (23) is a through hole that penetrates the adapter (22).

12. The battery according to claim 6, characterized in that, On the cross-section of the adapter (22) perpendicular to the height direction of the battery, the through hole (23) is an opening that does not penetrate the adapter (22).

13. The battery according to claim 12, characterized in that, On the cross section of the adapter (22) perpendicular to the height direction of the battery, along the extension direction of the tab (32), the extension length of the through hole (23) is J, in mm, and the extension length of the tab (32) is K, in mm, where J and K satisfy 2≤JK≤10, in mm.

14. The battery according to claim 12, characterized in that, On the cross section of the adapter (22) perpendicular to the height direction of the battery, along the extension direction of the tab (32), the extension length J of the through hole (23) satisfies 10≤JK≤40, in mm.

15. The battery according to claim 12, characterized in that, On the cross-section of the adapter (22) perpendicular to the height direction of the battery, the extension length K of the tab (32) satisfies 8≤K≤35, in mm.

16. The battery according to claim 1, characterized in that, The cell body (31) is cylindrical, and the limiting member (40) is disposed on the circumferential outer side of the cell body (31) on the cross-section of the battery perpendicular to the height direction of the battery.

17. The battery according to claim 1, characterized in that, The cell body (31) is cubic in shape. On the cross-section of the battery perpendicular to the height direction of the battery, the limiting member (40) is provided on both sides of the length direction of the cell body (31). And / or, the cell body (31) is cubic in shape, and on the cross section of the battery perpendicular to the height direction of the battery, the limiting member (40) is disposed on both sides of the width direction of the cell body (31).

18. The battery according to claim 1, characterized in that, The cell body (31) is cubic in shape. On the cross-section of the battery perpendicular to the height direction of the battery, the limiting member (40) is L-shaped and is wrapped around the four corners of the cell body (31).

19. The battery according to claim 1, characterized in that, On the cross-section of the battery along the height direction, the limiting member (40) is attached to the upper edge of the cell body (31), and the upper width of the limiting member (40) is greater than the lower width.

20. The battery according to claim 1, characterized in that, The limiting member (40) is an insulating adhesive layer or an insulating pad, so that the housing (10) and the battery cell body (31) are relatively insulated from each other.

21. The battery according to claim 6, characterized in that, The tab (32) is configured to be fixedly connected to the lower end face of the pole body (21) by welding.

22. A battery pack, characterized in that, It includes at least one battery according to any one of claims 1 to 21.

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