Batteries and battery packs

Abstract

This application relates to the technical field of batteries and specifically proposes a battery and a battery pack. The battery includes a casing, a terminal assembly, and a cell. The casing has mounting holes. The terminal assembly covers the mounting holes and includes terminals. The cell is disposed within the casing and includes a cell body and multiple tabs extending from the cell body. The multiple tabs are gathered together to form a tab group, which is electrically connected to the terminals. Along the width direction of the tab group, the dimension of the tab group is L1, and the dimension of the terminals is L2, satisfying 0mm ≤ L1 - L2 ≤ 18mm. In this application, L1-L2 should be moderate. Otherwise, if L1-L2 is too large, it also means L1 is too large, and the edge of the tab group is prone to overlapping with the wall of the mounting hole. When the tab group passes through the mounting hole, it will rub against the hole wall, causing metal foreign objects to enter the cell and posing a short circuit risk. Furthermore, if L1-L2 is too small, that is, if L1 is too small, it will affect the current-carrying area of ​​the tabs and the charge / discharge rate of the battery.

Description

Technical Field

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

[0002] In practical applications, some batteries include a casing, a cell, a cover plate, and a terminal assembly. The cell is located inside the casing, and the cover plate is welded to the opening of the casing, on which mounting holes are machined. Multiple tabs are led out from the cell and folded together. During assembly, the folded tabs extend from the mounting holes and are welded to the terminals of the terminal assembly. Then, the terminal assembly is placed on the mounting holes and welded to fix it.

[0003] However, the folded tabs are prone to friction with the wall of the mounting hole or nearby parts, which can cause foreign objects to fall out and come into contact with the battery cell, creating a short circuit risk. Utility Model Content

[0004] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0005] This application proposes a battery comprising a casing, a terminal assembly, and a battery cell; wherein, a cover plate is provided with mounting holes; the terminal assembly covers the mounting holes, and the terminal assembly includes terminals; the battery cell is disposed within the casing and includes a battery cell body and multiple tabs extending from the battery cell body, the multiple tabs being gathered together to form a tab group, the tab group being electrically connected to the terminals; wherein, along the width direction of the tab group, the dimension of the tab group is L1, the dimension of the terminals is L2, and the condition 0mm≤L1-L2≤18mm is met.

[0006] The technical solution proposed in this application has at least the following technical effects:

[0007] In this application, along the width direction of the tab assembly, the size L1 of the tab assembly is larger than the size L2 of the terminal post to ensure the current carrying capacity. At the same time, the difference between the two should be moderate, that is, L1-L2 should be moderate. Otherwise, if L1-L2 is too large, it also means that L1 is too large. The edge of the tab assembly is easy to overlap with the wall of the mounting hole. When the tab assembly passes through the mounting hole, it will rub against the hole wall, generating metal foreign objects that enter the cell and cause a short circuit risk. In addition, if L1-L2 is too small, that is, if L1 is too small, it will affect the current carrying area of ​​the tab and affect the charging and discharging rate of the battery. Attached Figure Description

[0008] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.

[0009] Specifically, the annotations for the accompanying drawings are as follows:

[0010] Figure 1 This is a schematic diagram of the overall structure of the battery described in some embodiments of this application;

[0011] Figure 2 This is a partial cross-sectional schematic diagram of the battery described in some embodiments of this application;

[0012] Figure 3 This is a schematic diagram of the structure of the battery cell described in some embodiments of this application;

[0013] Figure 4 This is a schematic diagram of the structure of the cover plate described in some embodiments of this application.

[0014] Specifically, the annotations for the figure marks in the instruction manual are as follows:

[0015] 10. Cover plate; 101. Mounting hole; 20. Terminal assembly; 201. Terminal; 202. Connector; 203. Sealing ring; 204. Rubber-coated part; 205. Insulating part; 30. Battery cell; 301. Battery cell body; 302. Tab assembly; 40. Housing; X, first direction; Y, second direction. Detailed Implementation

[0016] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It should be understood that the content mentioned below represents only some embodiments of this application, and not all embodiments are listed exhaustively. Therefore, other embodiments that can be obtained based on the following embodiments without any inventive effort fall within the protection scope of this application.

[0017] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.

[0018] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.

[0019] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0020] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.

[0021] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0022] Firstly, referring to Figures 1 to 4 This application provides an embodiment of a battery, which includes a housing 40, a terminal assembly 20, and a battery cell 30; wherein, the housing 40 is provided with a mounting hole 101; the terminal assembly 20 covers the mounting hole 101, and the terminal assembly 20 includes a terminal 201; the battery cell 30 is disposed inside the housing 40, and includes a battery cell body 301 and multiple tabs extending from the battery cell body 301, the multiple tabs are gathered to form a tab group 302, and the tab group 302 is electrically connected to the terminal 201; wherein, along the width direction of the tab group 302, the size of the tab group 302 is L1, the size of the terminal 201 is L2, and the condition 0mm≤L1-L2≤18mm is met.

[0023] In this embodiment, along the width direction of the tab assembly 302, the size L1 of the tab assembly 302 is larger than the size L2 of the terminal post 201 to ensure the current carrying capacity. At the same time, the difference between the two should be moderate, that is, L1-L2 should be moderate. Otherwise, if L1-L2 is too large, it also means that L1 is too large. The edge of the tab assembly 302 is likely to overlap with the wall of the mounting hole 101. When the tab assembly 302 passes through the mounting hole 101, it will rub against the hole wall, generating metal foreign objects that enter the cell 30 and cause a short circuit risk. In addition, if L1-L2 is too small, that is, if L1 is too small, it will affect the current carrying area of ​​the tab and affect the charging and discharging rate of the battery.

[0024] Therefore, L1-L2 should be moderate. For example, L1-L2 can be any one of the following values: 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, and 18mm, or a range between any two of these values.

[0025] Optionally, 10mm ≤ L1 ≤ 30mm, 10mm ≤ L2 ≤ 20mm. Referring to the above analysis, the values ​​of L1 and L2 should be moderate. For example, L1 can take any one of the following values, or fall within the range of any two of them: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, and 30mm; L2 can take any one of the following values, or fall within the range of any two of them.

[0026] For ease of explanation, the width direction of the tab assembly 302 is defined as the first direction X. It can be understood that, referring to... Figure 1 That is, the length direction of the battery is the first direction X; and the thickness direction of the battery is the second direction Y, which is perpendicular to the first direction X.

[0027] In some embodiments, refer to Figure 4 Along the width direction of the tab assembly 302, the size of the mounting hole 101 is L3, and it satisfies 0.5≤L1 / L3≤0.9.

[0028] In this embodiment, along the first direction X, the ratio of the width L1 of the tab assembly 302 to the size L3 of the mounting hole 101 cannot be too large. Otherwise, it means that the width L1 of the tab assembly 302 is large, and the edge of the tab assembly 302 is likely to overlap with the wall of the mounting hole 101. When the tab assembly 302 passes through the mounting hole 101, it will rub against the hole wall, generating metal foreign objects that enter the cell 30, causing a short circuit risk. At the same time, L1 / L3 cannot be too small. Otherwise, it means that the width L1 of the tab assembly 302 is small, which will affect the current-carrying area of ​​the tab and affect the charging and discharging rate of the battery. For example, L1 / L3 can be any one of 0.5, 0.6, 0.7, 0.8, and 0.9 or within the range of any two of these values.

[0029] Optionally, 12mm≤L3≤35mm. Similarly, L3 should also be moderate. For example, L3 can be any one of 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm and 35mm or fall within the range of any two of these values.

[0030] In some embodiments, refer to Figure 4 Along the width direction of the tab assembly 302, the distance between the edge of the tab assembly 302 and the wall of the mounting hole 101 is d1, and satisfies 2mm≤d1≤10mm.

[0031] In this embodiment, along the first direction X, the distance d1 between the edge of the tab assembly 302 and the wall of the mounting hole 101 should be appropriate. This is to avoid friction between the tab assembly 302 and the hole wall when it passes through the mounting hole 101, while ensuring that the tab assembly 302 has sufficient flow area. For example, d1 can be any value of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, or a range between any two of these values.

[0032] In some embodiments not shown in the figures, the centerline of the tab assembly 302 coincides with the centerline of the pole post 201 along the width direction of the tab assembly 302.

[0033] In this embodiment, along the first direction X, the center line of the tab assembly 302 coincides with the center line of the pole post 201, which facilitates positioning and assembly operations, and the welding effect between the tab assembly 302 and the pole post 201 is good.

[0034] In some embodiments, refer to Figure 3 Along the width direction of the tab assembly 302, the center line of the tab assembly 302 is offset relative to the center line of the pole post 201, and the offset distance d2 satisfies 3mm≤d2≤8mm.

[0035] In this embodiment, offsetting the centerline of the tab assembly 302 relative to the centerline of the pole post 201 along the first direction X is also a desirable implementation. However, the offset distance d2 between the two cannot be too large. Specifically, since multiple tabs will be misaligned in the width direction, if d2 is too large, the welding quality between the tab assembly 302 and the pole post 201 will deteriorate, and it is easy to produce cold solder joints. For example, d2 can be any value of 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm, or a range between any two of these values.

[0036] In some embodiments, refer to Figure 3Along the width direction of the tab assembly 302, the center line of the tab assembly 302 is offset relative to the center line of the pole post 201 towards the center line of the cell 30, and satisfies 3mm≤d2≤8mm. Alternatively, along the width direction of the tab assembly 302, the center line of the tab assembly 302 is offset relative to the center line of the pole post 201 towards the side away from the center line of the cell 30, and satisfies 3mm≤d2≤5mm.

[0037] In this embodiment, along the first direction X, the tab assembly 302 is closer to the inner side of the cell 30, resulting in a shorter current path from the cell 30 to the tab assembly 302, better current flow, and lower internal resistance, which is beneficial for improving battery performance. In this case, the offset distance satisfies 3mm ≤ d2 ≤ 8mm. Of course, offsetting the tab assembly 302 away from the centerline of the cell 30 is also a desirable implementation method, and the offset distance can be appropriately smaller, specifically satisfying 3mm ≤ d2 ≤ 5mm.

[0038] In some embodiments not shown in the figures, the tab assembly 302 is welded to the pole post 201 to form a solder mark, and the minimum distance from the solder mark to the edge of the multiple tabs is greater than or equal to 3 mm.

[0039] In this embodiment, the minimum distance between the solder mark between the tab assembly 302 and the pole post 201 and the edge of the multiple tabs is greater than or equal to 3mm, so as to ensure good welding effect between the tab assembly 302 and the pole post 201 and avoid cold solder joints.

[0040] In some embodiments not shown in the figures, the tab assembly 302 is bent and forms at least one bend.

[0041] In this embodiment, the tab assembly is bent to reduce the space occupied, which helps to improve the volumetric energy density of the battery.

[0042] In some embodiments, reference 1 and Figure 2 A cover plate 10 is provided on one side of the housing 40. The housing 40 has an opening, and the cover plate 10 covers the opening. The cover plate 10 is provided with a mounting hole 101.

[0043] In this embodiment, a cover plate 10 is provided on one side of the housing 40, and the cover plate 10 is provided with a mounting hole 101. The pole post assembly 20 is provided on the cover plate 10. It should be understood that the housing 40 can also be directly provided with a mounting hole 101, and the pole post assembly 20 can be directly connected to the housing 40, which is also a preferred implementation.

[0044] In some embodiments, refer to Figure 2 Along the width direction of the tab assembly 302, the distance d3 between the edge of the tab assembly 302 and the side wall of the housing 40 satisfies 8mm≤d3≤30mm.

[0045] In this embodiment, the edge of the tab assembly 302 must not be too close to the housing 40, otherwise it may easily lead to insulation failure, arcing, or short circuit. Therefore, along the first direction X, the distance d3 between the edge of the tab assembly 302 and the side wall of the housing 40 should satisfy 8mm ≤ d3 ≤ 30mm. For example, d3 can be any one of 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, and 30mm, or a range between any two of these values.

[0046] In some embodiments, refer to Figure 2 The pole assembly 20 also includes a connector 202 and a sealing ring 203. The connector 202 is provided in the mounting hole 101. The connector 202 is provided with a pole hole, the pole 201 is provided in the pole hole, and the sealing ring 203 seals between the pole 201 and the pole hole.

[0047] In this embodiment, the terminal post 201 is assembled into the mounting hole 101 of the cover plate 10 through the connector 202. The sealing ring 203 seals the terminal post 201 and the terminal post 201 hole of the connector 202, ensuring the sealing of the battery interior and also providing insulation.

[0048] In some embodiments, refer to Figure 2 The terminal assembly 20 also includes an encapsulated part 204, which covers the outside of the terminal 201, and / or the terminal assembly 20 also includes an insulating part 205, which is disposed on the side of the connector 202 facing the cell 30.

[0049] In this embodiment, the rubber-coated part 204 can both press and limit the terminal post 201, and also isolate the terminal post 201 from the connector 202, thus providing insulation. In addition, the insulating part 205 can prevent the connector 202 from contacting the cell 30, thus providing insulation and ensuring battery safety.

[0050] Secondly, embodiments of this application propose a battery pack that includes the battery of the first aspect. Therefore, the battery pack of the second aspect possesses all the technical effects of the battery of the first aspect, the specific effects of which will not be elaborated further.

[0051] It should be noted that the battery in this embodiment only presents the structure related to the improvement points. Of course, it may also include other components, such as a frame for accommodating multiple batteries, a battery protection board, etc. Other components will not be described here.

[0052] In particular, the term "and / or" in this application should be understood as follows:

[0053] In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.

[0054] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject;

[0055] Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.

[0056] Finally, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.

Claims

1. A battery, characterized by, include: The housing (40) is provided with mounting holes (101); A pole assembly (20) that covers the mounting hole (101), the pole assembly (20) including a pole (201); A battery cell (30) is disposed inside the housing (40) and includes a battery cell body (301) and multiple tabs extending from the battery cell body (301). The multiple tabs are gathered together to form a tab group (302), and the tab group (302) is electrically connected to the terminal post (201). Wherein, along the width direction of the tab group (302), the size of the tab group (302) is L1, the size of the pole post (201) is L2, and the condition 0mm≤L1-L2≤18mm is satisfied.

2. The battery of claim 1, wherein, Along the width direction of the tab assembly (302), the dimension L1 of the tab assembly (302) satisfies 10mm≤L1≤30mm; And / or, along the width direction of the tab assembly (302), the dimension L2 of the pole post (201) satisfies 10mm≤L2≤20mm.

3. The battery of claim 1, wherein, Along the width direction of the tab assembly (302), the size of the mounting hole (101) is L3, and satisfies 0.5≤L1 / L3≤0.

9.

4. The battery of claim 3, wherein, Along the width direction of the tab assembly (302), the size L3 of the mounting hole (101) satisfies 12mm≤L3≤35mm.

5. The battery of claim 1, wherein, Along the width direction of the tab assembly (302), the distance between the edge of the tab assembly (302) and the wall of the mounting hole (101) is d1, and satisfies 2mm≤d1≤10mm.

6. The battery of claim 1, wherein, Along the width direction of the tab assembly (302), the centerline of the tab assembly (302) coincides with the centerline of the pole post (201).

7. The battery of claim 1, wherein, Along the width direction of the tab group (302), the center line of the tab group (302) is offset relative to the center line of the pole post (201), and the offset distance d2 satisfies 3mm≤d2≤8mm.

8. The battery of claim 7, wherein, Along the width direction of the tab group (302), the center line of the tab group (302) is offset relative to the center line of the pole post (201) towards the center line of the cell (30), and satisfies 3mm≤d2≤8mm; Alternatively, along the width direction of the tab group (302), the center line of the tab group (302) is offset away from the center line of the electrode post (201) from the center line of the cell (30), and satisfies 3mm≤d2≤5mm.

9. The battery of claim 1, wherein, The tab assembly (302) is welded to the pole post (201) to form a weld mark, and the minimum distance from the weld mark to the edge of the multiple tabs is greater than or equal to 3mm.

10. The battery of claim 1, wherein, The tab assembly (302) is bent and forms at least one bent portion.

11. The battery of claim 1, wherein, The housing (40) has a cover plate (10) on one side, the housing (40) has an opening, the cover plate (10) covers the opening, and the cover plate (10) has the mounting hole (101).

12. The battery of claim 1, wherein, Along the width direction of the tab assembly (302), the distance d3 between the edge of the tab assembly (302) and the side wall of the housing (40) satisfies 8mm≤d3≤30mm.

13. The battery of any one of claims 1 to 12, wherein, The pole assembly (20) further includes a connector (202) and a sealing ring (203), wherein the connector (202) is disposed in the mounting hole (101); The connector (202) is provided with a pole hole, the pole (201) is provided in the pole hole, and the sealing ring (203) seals between the pole (201) and the pole hole.

14. The battery of claim 13, wherein, The electrode assembly (20) further includes an encapsulating member (204) which covers the outside of the electrode (201), and / or the electrode assembly (20) further includes an insulating member (205) which is disposed on the side of the connector (202) facing the cell (30).

15. A battery pack, characterized by Includes the battery as described in any one of claims 1 to 14.

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