Single cell

Abstract

The utility model discloses a single battery, single battery includes: cover plate subassembly, electrode subassembly, adapter piece includes: pole connecting section, tab connecting section, and tab connecting section is protrudingly arranged to the side of cover plate subassembly in the first direction relative to pole connecting section, and the maximum distance of pole connecting section and cover plate subassembly in the first direction is a, and the maximum protruding height of tab connecting section relative to pole connecting section in the first direction is b, and a and b satisfy the relation formula: 0.4<=b / a<1. Therefore, the ratio b / a of the maximum protruding height b of tab connecting section relative to pole connecting section in the first direction and the maximum distance a of pole connecting section and cover plate subassembly in the first direction is set in the reasonable range, not only can prevent b / a too small, lead to the existence of the big space between adapter piece and cover plate subassembly is wasted, can improve the battery capacity of electrode subassembly, and also can prevent b / a too big, lead to adapter piece and cover plate subassembly interference, can improve the reliability of single battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a single-cell battery. Background Technology

[0002] With increasing emphasis on environmental protection, electric vehicles have rapidly emerged in the vehicle industry due to their energy-saving and environmentally friendly advantages. Electric vehicles use batteries as their power supply, and adapter plates are installed inside the batteries to connect the terminals and tabs. These adapter plates play a crucial role in battery safety and power supply stability.

[0003] In existing technologies, the placement of some adapter plates within the battery leads to wasted space between the cell and the cover plate, resulting in lower cell capacity. Furthermore, some adapter plates are prone to interference with the battery cover plate, leading to poor battery reliability. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a single-cell battery that not only has a large cell capacity, but also whose adapter plate is less likely to interfere with the cover plate.

[0005] A single-cell battery according to an embodiment of the present invention includes: a cover plate assembly including a terminal post; an electrode assembly including a tab; and an adapter piece disposed on the side of the cover plate assembly facing the electrode assembly and including: a terminal post connecting section connected to the terminal post; and a tab connecting section connected to both sides of the terminal post connecting section, wherein both sides of the terminal post connecting section are connected to the tab, and the tab connecting section protrudes relative to the terminal post connecting section in a first direction toward the cover plate assembly, wherein the first direction is the thickness direction of the cover plate assembly; the maximum distance between the terminal post connecting section and the cover plate assembly in the first direction is a, and the maximum protrusion height of the tab connecting section relative to the terminal post connecting section in the first direction is b, wherein a and b satisfy the relationship: 0.4 ≤ b / a < 1.

[0006] Therefore, by setting the ratio b / a, which is the maximum protrusion height b of the electrode connection section relative to the electrode post connection section in the first direction and the maximum distance a between the electrode post connection section and the cover plate assembly in the first direction, within a reasonable range, it can not only prevent b / a from being too small, which would result in a large amount of wasted space between the adapter plate and the cover plate assembly and improve the cell capacity of the electrode assembly, but also prevent b / a from being too large, which would result in interference between the adapter plate and the cover plate assembly and improve the reliability of the single cell.

[0007] According to some embodiments of the present invention, the electrode connecting section includes a plurality of stepped portions connected in a second direction, wherein one of two adjacent stepped portions further away from the electrode connecting section protrudes relative to the other along the first direction toward the cover plate assembly, and the second direction is the width direction of the cover plate assembly.

[0008] According to some embodiments of the present invention, the electrode connecting section includes a first step portion and a second step portion arranged adjacent to each other. The first step portion is connected between the second step portion and the electrode connecting section. The electrode connecting section is connected to the first step portion through a first bending transition portion, and the first step portion is connected to the second step portion through a second bending transition portion.

[0009] According to some embodiments of the present invention, the protrusion height of the first step portion relative to the pole connecting section in the first direction is c, and c and a satisfy the relationship: 0.1≤c / a≤0.35; and / or the protrusion height of the second step portion relative to the first step portion in the first direction is d, and d and a satisfy the relationship: 0.1≤d / a≤0.35.

[0010] According to some embodiments of the present invention, the electrode connecting section consists of a stepped portion and a third bent transition portion, and the stepped portion is connected to the electrode connecting section through the third bent transition portion.

[0011] According to some embodiments of the present invention, the tab connecting section includes at least one stepped portion along the second direction, the stepped portion furthest from the pole connecting section in the first direction is welded to the tab to form a tab welding area, the pole connecting section is welded to the pole to form a pole welding area, the tab welding area and the pole welding area are spaced apart by orthographic projection on the same plane along the first direction, a through hole is provided between the tab welding area and the pole welding area, and the second direction is the width direction of the cover plate assembly.

[0012] According to some embodiments of the present invention, the dimension of the through hole along the third direction is g, and the distance between two opposite edges of the adapter piece in the region where the through hole is located along the third direction is h, wherein 0.5≤h / g≤0.85, and the third direction is the length direction of the cover plate assembly and is perpendicular to the second direction.

[0013] According to some embodiments of the present invention, the electrode connecting section consists of a stepped portion and a third bending transition portion. The stepped portion is connected to the electrode connecting section through the third bending transition portion. The stepped portion is connected to the electrode, and the through hole is formed in the third bending transition portion.

[0014] According to some embodiments of the present invention, the electrode connecting section includes a first step portion and a second step portion arranged adjacent to each other. The first step portion is connected between the second step portion and the electrode connecting section. The electrode connecting section is connected to the first step portion through a first bending transition portion. The first step portion and the second step portion are connected through a second bending transition portion. The second step portion is connected to the electrode ear. The through hole is formed in the first step portion.

[0015] According to some embodiments of the present invention, the single battery further includes an insulating member disposed on a side wall of the cover assembly facing the electrode assembly along the first direction. The insulating member includes a main body and a protrusion. The main body is at least partially disposed on both sides of the protrusion in the second direction. The electrode post passes through the protrusion and is connected to the electrode post connecting section. The protrusion protrudes towards the electrode assembly relative to the main body in the first direction. The electrode post connecting section corresponds to and is spaced apart from the protrusion in the first direction. The electrode tab connecting section includes at least one stepped portion along the second direction. The stepped portion furthest from the electrode post connecting section in the first direction corresponds to and is spaced apart from the main body in the first direction.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a single battery cell according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the cover plate and the adapter piece according to the first embodiment of the present utility model; Figure 3 This is a cross-sectional view of the cover plate and the adapter piece according to the first embodiment of the present utility model; Figure 4 This is a schematic diagram of the adapter piece according to the first embodiment of the present invention; Figure 5 This is a schematic diagram of the adapter piece according to the first embodiment of the present invention; Figure 6 This is a schematic diagram of the adapter piece according to the first embodiment of the present invention; Figure 7 This is a schematic diagram of the adapter piece according to the first embodiment of the present invention; Figure 8This is a schematic diagram of the adapter piece according to the first embodiment of the present invention; Figure 9 This is a schematic diagram of the cover plate and the adapter piece according to the second embodiment of the present utility model; Figure 10 This is a cross-sectional view of the cover plate and the adapter piece according to the second embodiment of the present utility model; Figure 11 This is a schematic diagram of the adapter piece according to the second embodiment of the present utility model; Figure 12 This is a schematic diagram of the adapter piece according to the second embodiment of the present utility model; Figure 13 This is a schematic diagram of the adapter piece according to the second embodiment of the present utility model; Figure 14 This is a schematic diagram of the adapter piece according to the second embodiment of the present utility model; Figure 15 This is a schematic diagram of the adapter piece according to the second embodiment of the present invention.

[0018] Figure label: 1000, single cell battery; 100. Adapter plate; 101. First side surface; 102. Second side surface; 10. Pole post connection section; 11. Pole post welding area; 30. Electrode connecting section; 31. Stepped section; 311. First stepped section; 312. Second stepped section; 313. First bending transition section; 314. Second bending transition section; 315. Third bending transition section; 32. Electrode welding area; 40. Through hole; 200, cover plate assembly; 201, insulating component; 2011, protrusion; 2012, main body; 202, pole hole; 203, pole; 300, electrode assembly. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0020] The following is for reference. Figures 1-15 Description of a single-cell battery 1000 according to an embodiment of the present utility model.

[0021] Combination Figures 1-15As shown, the single-cell battery 1000 according to an embodiment of the present invention may mainly include: a cover plate assembly 200, an electrode assembly 300, and an adapter plate 100. The cover plate assembly 200 includes a terminal post 203, the electrode assembly 300 includes a tab, and the adapter plate 100 is disposed on the side of the cover plate assembly 200 facing the electrode assembly 300 and includes: a terminal post connecting section 10 and a tab connecting section 30. The terminal post connecting section 10 is connected to the terminal post 203, and the tab connecting section 30 is connected to both sides of the terminal post connecting section 10. The tab connecting sections 30 on both sides of the terminal post connecting section 10 are connected to the tabs. The tab connecting section 30 protrudes relative to the terminal post connecting section 10 in a first direction toward the side facing the cover plate assembly 200, wherein the first direction is the thickness direction of the cover plate assembly 200.

[0022] It should be noted that the first direction in this utility model can be the thickness direction of the cover plate assembly 200, the second direction in this utility model can be the width direction of the cover plate assembly 200, and the third direction in this utility model can be the length direction of the cover plate assembly 200. The electrode assembly 300 includes a housing and a battery cell. The battery cell is disposed inside the housing. One side of the housing in the first direction is open. The battery cell is provided with an electrode tab on the side of the open side of the housing corresponding to the open side. The cover plate assembly 200 covers the open side of the housing.

[0023] Specifically, when the adapter piece 100 is applied to the single cell 1000, the adapter piece 100 is disposed on the side of the cover plate assembly 200 facing the electrode assembly 300. The two sides of the adapter piece 100 arranged opposite to each other along the first direction are respectively the first side 101 and the second side 102, wherein the first side 101 faces the cover plate assembly 200 and the second side 102 faces the electrode assembly 300. The adapter piece 100 includes a terminal post connecting section 10 and a tab connecting section 30. The first side 101 of the terminal post connecting section 10 is welded and fixed to the terminal post 203. There are two tab connecting sections 30, which are respectively connected to the two sides of the terminal post connecting section 10. The second side 102 of the two tab connecting sections 30 on both sides of the terminal post connecting section 10 are welded and fixed to the tabs.

[0024] It should be noted that the two tab connecting sections 30 can be connected to both sides of the electrode post connecting section 10 in the second direction, or they can be connected to both sides of the electrode post connecting section 10 in the third direction. This can be selectively configured according to the position of the tabs in the electrode assembly 300. In the embodiment of this utility model, the two tab connecting sections 30 are respectively connected to both sides of the electrode post connecting section 10 in the second direction.

[0025] In the prior art, if there is no height difference between the tab connection section and the pole connection section in the first direction, that is, the adapter is a flat adapter, then after the tab connection section is connected to the tab, the distance between the tab and the cover plate assembly is relatively far, and there is a spare space between the tab connection section and the cover plate assembly. This will result in a certain degree of space waste inside the single cell 100.

[0026] In some embodiments of this utility model, the tab connecting section 30 protrudes from the side of the pole connecting section 10 facing the cover plate assembly 200 in the first direction, so that a height difference in the first direction is formed between the pole connecting section 10 and the tab connecting section 30, which makes the tab connecting section 30 closer to the cover plate assembly 200 relative to the pole connecting section 10.

[0027] Thus, during the manufacturing process of the single cell 100, while ensuring that the overall volume of the single cell 100 remains unchanged, the height of the portions on both sides of the cover plate assembly 200 in the width direction corresponding to the electrode assembly 300 can be increased in the first direction. This allows the tabs on both sides of the cover plate assembly 200 in the width direction to be closer to the tab connecting section 30 protruding towards the cover plate assembly 200, making the welding and fixing of the tabs to the tab connecting section 30 protruding towards the cover plate assembly 200 more stable. This allows the electrode assembly 300 to make full use of the empty space generated by the tab connecting section 30 protruding towards the cover plate assembly 200, thereby increasing its own volume and thus increasing the capacity of the cell itself.

[0028] Furthermore, the tab connection section 30 protrudes from the side of the terminal post connection section 10 facing the cover plate assembly 200 in the first direction. The tab connection section 30 is closer to the cover plate assembly 200 in the first direction, which can easily cause interference between the tab connection section 30 and the insulating member 201 on the cover plate assembly 200. This can cause the insulating member 201 to squeeze the tab connection section 30, resulting in unstable electrical connection between the tab connection section 30 and the tab, thus leading to poor overall reliability of the single cell 100. Therefore, since the tab connection section 30 protrudes from the side of the terminal post connection section 10 facing the cover plate assembly 200 in the first direction, it is necessary to control the distance between the tab connection section 30 and the insulating member 201 on the cover plate assembly 200 to ensure that the tab connection section 30 and the insulating member 201 on the cover plate assembly 200 are spaced apart.

[0029] It should be noted that the insulating component 201 is disposed on one side wall of the cover plate assembly 200 facing the electrode assembly 300 along the first direction. The insulating component 201 is a structure made of plastic material, which can be a plastic frame. The plastic frame is located between the cover plate assembly 200 and the electrode assembly 300. The plastic frame is used to moderately limit the circumferential movement of the battery cell of the electrode assembly 300, preventing the battery cell from moving along the first direction or along the second or third direction within the housing.

[0030] Therefore, the maximum distance between the pole connecting section 10 and the cover plate assembly 200 in the first direction is set to a, and the maximum protrusion height of the pole connecting section 30 relative to the pole connecting section 10 in the first direction is set to b. a and b satisfy the relationship: 0.4≤b / a<1.

[0031] Specifically, the first side 101 of the pole post connecting section 10 and the first side 101 of the tab connecting section 30 are both sides of the adapter piece 100 facing the cover plate. The maximum distance between the pole post connecting section 10 and the cover plate assembly 200 in the first direction is 'a', that is, 'a' is the distance between the first side 101 of the pole post connecting section 10 and the cover plate assembly 200 in the first direction. The maximum protrusion height of the tab connecting section 30 relative to the pole post connecting section 10 in the first direction is 'b', that is, 'b' is the maximum protrusion height of the first side 101 of the tab connecting section 30 relative to the first side 101 of the pole post connecting section 10 in the first direction. (The last sentence appears to be incomplete and requires further context.) The ratio b / a is set within a reasonable range. On the one hand, it can prevent b / a from being too large, which would result in a large distance between the tab connection section 30 and the insulating part 201 of the cover plate assembly 200 in the first direction, and there would still be a large amount of unused space between the tab connection section 30 and the insulating part 201 of the cover plate assembly 200. On the other hand, it can prevent b / a from being too small, which would result in the tab connection section 30 and the insulating part 201 of the cover plate assembly 200 being too close, or even interference between the tab connection section 30 and the insulating part 201 of the cover plate assembly 200, resulting in poor structural reliability of the single cell 100.

[0032] Therefore, by setting the ratio b / a of the maximum protrusion height b of the tab connection section 30 relative to the terminal connection section 10 in the first direction and the maximum distance a between the terminal connection section 10 and the cover plate assembly 200 in the first direction to be greater than 0.4 mm and less than 1 mm, it is possible not only to ensure that the space in the single cell 100 is fully utilized by the electrode assembly 300, thereby increasing the cell capacity of the electrode assembly 300, but also to prevent interference between the adapter piece 100 and the insulating part 201 of the cover plate assembly 200, thereby improving the structural reliability of the single cell 100.

[0033] In some embodiments of this utility model, combined with Figure 1 As shown, there are two terminals 203, which are a positive terminal 203 and a negative terminal 203, respectively. The positive terminal 203 and the negative terminal 203 are arranged alternately in a third direction. The cell is also provided with a positive tab and a negative tab. The positive tab is located on both sides of the positive terminal 203 in a second direction, and the negative tab is located on both sides of the negative terminal 203 in a second direction. When the adapter piece 100 is applied to the single cell 100, two adapter pieces 100 need to be set to correspond to the positive terminal 203 and the negative terminal 203 respectively.

[0034] In some embodiments of this utility model, in order to meet the requirements of processing and manufacturing, chamfers can be provided on the corresponding parts of the adapter piece 100.

[0035] In the first embodiment of this utility model: Combination Figures 2-8 As shown, the electrode connecting section 30 includes a plurality of stepped portions 31 connected in a second direction, wherein one of two adjacent stepped portions 31 further away from the electrode connecting section 10 protrudes relative to the other along the first direction toward the cover plate assembly 200.

[0036] It should be noted that the cover plate assembly 200 has a pole hole 202, and the pole 203 passes through the pole hole 202 and is fixed to the pole connection section 10 by welding. In order to ensure the structural strength and stability of the pole 203, the cover plate assembly 200 needs to be provided with a structural reinforcement around the pole hole 202. Correspondingly, the insulating member 201 also has a protrusion 2011 in the part adjacent to the pole hole 202. The protrusion 2011 protrudes towards the adapter piece 100 in the first direction compared to the other parts of the insulating member 201 (hereinafter referred to as the main body 2012).

[0037] This invention does not increase the height difference between the pole post connecting section 10 and the pole ear connecting section 30 in the first direction by directly increasing the height difference in the first direction. Instead, it sets the pole ear connecting section 30 as a plurality of stepped portions 31 connected in the second direction, and makes one of two adjacent stepped portions 31 protrude from the side of the pole post connecting section 10 relative to the other in the first direction toward the cover plate assembly 200.

[0038] With this configuration, provided that the maximum protrusion height b of the tab connection section 30 relative to the terminal connection section 10 in the first direction meets the requirements, the adapter piece 100 can bypass the protrusion 2011, preventing the step portion 31 adjacent to the terminal connection section 10 from having a large height difference with the terminal connection section 10 in the first direction, which would cause interference between the step portion 31 adjacent to the terminal connection section 10 and the protrusion 2011 of the insulating member 201. This can further improve the structural reliability of the single cell 100.

[0039] In addition, with this design, when the tabs are welded and electrically connected to at least a portion of the multiple stepped portions 31, the height difference in the first direction between two adjacent stepped portions 31 will not be too large, the edges of the multi-layer tabs will not abut against the bend between two adjacent stepped portions 31, and the edges of the multi-layer tabs will not stack at the bend between two adjacent stepped portions 31, which facilitates the core-gathering of the single cell 100.

[0040] In some embodiments of this utility model, when the electrode connecting section 30 includes multiple stepped portions 31, the stepped portion 31 furthest from the electrode post connecting section 10 along the second direction is welded and fixed to the electrode, while the other stepped portions 31 can abut against and contact the electrode.

[0041] Combination Figures 2-8 As shown, the electrode connecting section 30 includes a first step portion 311 and a second step portion 312 arranged adjacent to each other. The first step portion 311 is connected between the second step portion 312 and the electrode connecting section 10. The electrode connecting section 10 is connected to the first step portion 311 through a first bending transition portion 313, and the first step portion 311 and the second step portion 312 are connected through a second bending transition portion 314.

[0042] Specifically, by setting the tab connection section 30 as two interconnected stepped portions 31, the maximum protrusion height b of the tab connection section 30 relative to the pole post connection section 10 in the first direction can be guaranteed to meet the condition, and the tab connection section 30 can be prevented from bending too much and becoming structurally unstable, provided that the tab connection section 30 does not interfere with the protrusion 2011. This can improve the stability and reliability of the tab connection section 30 itself, thereby improving the overall structural reliability of the single cell 100.

[0043] Combination Figure 3 and Figure 7 As shown, the protrusion height of the first step portion 311 relative to the pole post connecting section 10 in the first direction is c, and c and a satisfy the relationship: 0.1≤c / a≤0.35; and / or the protrusion height of the second step portion 312 relative to the first step portion 311 in the first direction is d, and d and a satisfy the relationship: 0.1≤d / a≤0.35.

[0044] Furthermore, the protrusion height c of the first step portion 311 relative to the pole post connecting section 10 in the first direction and the protrusion height d of the second step portion 312 relative to the first step portion 311 in the first direction are both set within a reasonable range. This ensures that the ratio c / a of the protrusion height c of the first step portion 311 relative to the pole post connecting section 10 in the first direction and the maximum distance a between the pole post connecting section 10 and the cover plate assembly 200 in the first direction is within a reasonable range, and that the ratio d / a of the protrusion height d of the second step portion 312 relative to the first step portion 311 in the first direction and the maximum distance a between the pole post connecting section 10 and the cover plate assembly 200 in the first direction is within a reasonable range.

[0045] This configuration prevents c and d from being too large or too small, ensuring a small size difference between them. This allows for a more uniform structural distribution of the tab connection section 30, which not only improves the structural reliability of the tab connection section 30 itself but also enhances the stability of the electrical connection between the tab connection section 30 and the tab, thereby improving the performance of the single cell 100.

[0046] Furthermore, the first bending transition portion 313 is inclined relative to both the first step portion 311 and the pole post connecting section 10, and an obtuse angle is formed between the first bending transition portion 313, the first step portion 311, and the pole post connecting section 10, so that the first step portion 311 protrudes towards the cover plate assembly 200 relative to the pole post connecting section 10 in the first direction. The second bending transition portion 314 is inclined relative to both the first step portion 311 and the second step portion 312, and an obtuse angle is formed between the first bending transition portion 313, the first step portion 311, and the second step portion 312, so that the second step portion 312 protrudes towards the cover plate assembly 200 relative to the first step portion 311 in the first direction.

[0047] It should be noted that the first step portion 311 and the second step portion 312 defined in the first embodiment of this utility model are the parts where the horizontal plane of the step is located in real life, that is, the parts of the step that are stepped on in real life. The step portion 31 defined in the second embodiment of this utility model is also the same, and will not be described in detail.

[0048] The first bending transition portion 313 and the second bending transition portion 314 defined in this utility model are the parts of the steps that extend in the vertical plane in reality, that is, the parts that connect the two steps that are stepped on by the user. The third bending transition portion 315 defined in the second embodiment of this utility model is also like this, and will not be described in detail.

[0049] In addition, the first step portion 311 and the first bending transition portion 313 are respectively spaced apart from the protrusion 2011 of the insulating member 201 in the first direction. The first step portion 311 protrudes at least partially relative to the protrusion 2011 towards the side away from the pole hole 202 in the second direction. The second bending transition portion 314 and the second step portion 312 are respectively spaced apart from the protrusion 2011 in the second direction.

[0050] Furthermore, by reasonably setting the total length of the first step portion 311, the first bending transition portion 313, the second bending transition portion 314, and the second step portion 312 in the second direction, the edges of the adapter piece 100 and the insulating member 201 in the second direction can be spaced apart in the second direction. That is, the adapter piece 100 can bypass the protrusion 2011, thereby further preventing the insulating member 201 from interfering with the adapter piece 100.

[0051] In the second embodiment of this utility model: Combination Figures 9-15 As shown, the electrode connecting section 30 consists of a stepped portion 31 and a third bent transition portion 315. The stepped portion 31 is connected to the electrode connecting section 10 through the third bent transition portion 315.

[0052] Specifically, the electrode connecting section 30 consists of a stepped portion 31 and a third bent transition portion 315. The third bent transition portion 315 connects the stepped portion 31 and the electrode connecting section 10. The third bent transition portion 315 is inclined relative to both the stepped portion 31 and the electrode connecting section 10, and an obtuse angle is formed between the third bent transition portion 315 and the stepped portion 31 and the electrode connecting section 10. This allows the stepped portion 31 to protrude from the side of the electrode connecting section 10 facing the cover plate assembly 200 in the first direction. The length of the third bend transition portion 315 in the second direction is set to be larger than that of the first bend transition portion 313 and the second bend transition portion 314 in the first embodiment. This allows the end of the third bend transition portion 315 away from the pole post connecting section 10 to be spaced apart on one side of the protrusion 2011 in the second direction. As a result, the step portion 31 connected to the third bend transition portion 315 is spaced apart on one side of the protrusion 2011 in the second direction, so that the pole tab connecting section 30 will not interfere with the protrusion 2011 in the second direction or the first direction.

[0053] Furthermore, with this configuration, the angle formed between the step portion 31 and the third bending transition portion 315 is larger, which makes the bending of the third bending transition portion 315 smoother, and the electrode tab is easier to fit and connect with the third bending transition portion 315. The electrode tab is less likely to warp, which can improve the stability of the fit and connection between the electrode tab and the electrode tab connection section 30.

[0054] It should be noted that, in the second embodiment, the length of the third bending transition portion 315 in the second direction can be equal to the total length of the first bending transition portion 313, the first step portion 311, and the second bending transition portion 314 in the second direction in the first embodiment. In the second embodiment, the length of the step portion 31 in the second direction can be equal to the length of the second step portion 312 in the second direction in the first embodiment. This allows the edges of the adapter piece 100 and the insulating member 201 in the second direction to be spaced apart in the second direction.

[0055] Combination Figures 9-15As shown, the tab connecting section 30 includes at least one step portion 31 along the second direction. The step portion 31 furthest from the pole connecting section 10 in the first direction is welded to the tab to form a tab welding area 32. The pole connecting section 10 is welded to the pole 203 to form a pole welding area 11. The tab welding area 32 and the pole welding area 11 are spaced apart by orthographic projection on the same plane along the first direction. A through hole 40 is provided between the tab welding area 32 and the pole welding area 11. The second direction is the width direction of the cover plate assembly 200.

[0056] Specifically, the electrode connection section 30 is welded to the step portion 31 furthest from the terminal post connection section 10 in the first direction to form the electrode welding area 32, and the terminal post connection section 10 is welded to the terminal post 203 to form the terminal post welding area 11. The electrode welding area 32 and the terminal post welding area 11 are spaced apart from each other in the orthographic projection of the same plane along the first direction. By providing a through hole 40 in the area between the electrode welding area 32 and the terminal post welding area 11 of the adapter piece 100, the opening of the through hole 40 can reduce the structural strength of the area between the electrode welding area 32 and the terminal post welding area 11 of the adapter piece 100. When the adapter piece 100 is overcurrent, the third bending transition portion 315 can be melted due to the setting of the through hole 40, thereby protecting the single cell 1000 and the electrical device used by the single cell 1000 and preventing safety hazards.

[0057] Combination Figure 10 and Figure 14 As shown, the dimension of the through hole 40 along the third direction is g, and the distance between the two opposite edges of the adapter piece 100 in the area where the through hole 40 is located along the third direction is h, where 0.5≤h / g≤0.85, and the third direction is the length direction of the cover plate assembly 200 and is perpendicular to the second direction.

[0058] Specifically, by setting the ratio h / g of the distance h between the two opposite edges of the adapter piece 100 in the third direction along the third direction and the size g of the through hole 40 in the third direction within a reasonable range, it is possible not only to prevent h / g from being too large, resulting in a relatively small size of the through hole 40 in the third direction, making it less likely for the third bending transition portion 315 to melt when the adapter piece 100 is overflowing, but also to prevent h / g from being too small, resulting in a relatively large size of the through hole 40 in the third direction, causing the structure of the area where the through hole 40 is provided between the tab welding area 32 and the pole welding area 11 of the adapter piece 100 to be unstable, and possibly to break even when the adapter piece 100 is not overflowing, which would reduce the connection stability of the adapter piece 100 to the tab and the pole 203.

[0059] It should be noted that blind holes can also be provided in the area between the tab welding area 32 and the post welding area 11 of the adapter piece 100. Blind holes can also reduce the structural strength of the area between the tab welding area 32 and the post welding area 11 of the adapter piece 100, so that the area between the tab welding area 32 and the post welding area 11 of the adapter piece 100 will melt when the adapter piece 100 is overcurrent.

[0060] In the first embodiment of this utility model, combined with Figures 9-15 As shown, the electrode connecting section 30 consists of a stepped portion 31 and a third bend transition portion 315. The stepped portion 31 is connected to the electrode connecting section 10 through the third bend transition portion 315. The stepped portion 31 is connected to the electrode, and the through hole 40 is opened in the third bend transition portion 315.

[0061] Specifically, when the tab connection section 30 is composed of a stepped portion 31 and a third bending transition portion 315, the stepped portion 31 is welded to the tab, which makes the welding and fixing of the stepped portion 31 and the tab more stable. The third bending transition portion 315 can abut and fit against the tab. The through hole 40 is opened in the third bending transition portion 315. Without affecting the welding and fixing of the tab connection section 30 and the tab, the through hole 40 can melt the third bending transition portion 315 when the adapter piece 100 is overcurrent, thereby ensuring the safety of the single cell 1000.

[0062] In a second embodiment of the present invention, the electrode connecting section 30 includes a first step portion 311 and a second step portion 312 disposed adjacently. The first step portion 311 is connected between the second step portion 312 and the electrode connecting section 10. The electrode connecting section 10 is connected to the first step portion 311 through a first bending transition portion 313. The first step portion 311 and the second step portion 312 are connected through a second bending transition portion 314. The second step portion 312 is connected to the electrode. A through hole 40 is formed in the first step portion 311.

[0063] Specifically, when the tab connection section 30 includes an adjacent first step portion 311 and a second step portion 312, and the pole connection section 10 is connected to the first step portion 311 through a first bending transition portion 313, and the first step portion 311 and the second step portion 312 are connected through a second bending transition portion 314, the second step portion 312 is connected to the tab, which can ensure the stability of the welding and fixing of the second step portion 312 and the tab. By opening the through hole 40 in the first step portion 311, the first step portion 311 can be melted due to the setting of the through hole 40 when the adapter piece 100 is overcurrent, without affecting the welding and fixing of the second step portion 312 and the tab, thereby ensuring the safety of the single cell 1000.

[0064] In some embodiments of this utility model, the thickness of the pole connecting section 10 in the first direction is the same as the thickness of the tab connecting section 30 in the first direction, which can facilitate the production and manufacturing of the adapter piece 100 while ensuring a stable connection between the adapter piece 100 and the pole 203 and the tab.

[0065] In some other embodiments of the present invention, the pole connection section 10 is provided with at least a pole welding area 11, and the thickness of the pole welding area 11 in the first direction is less than the thickness of the tab connection section 30 in the first direction.

[0066] Specifically, when the cell capacity is large, more heat is generated. By increasing the thickness of the adapter piece 100, the heat dissipation performance of the adapter piece 100 can be improved. However, when the thickness of the electrode welding area 11 of the electrode connection section 10 is large, the electrical connection between the electrode welding area 11 and the electrode 203 is unstable. Therefore, it is necessary to thin the electrode welding area 11 of the electrode connection section 10 so that the thickness of the electrode welding area 11 in the first direction is less than the thickness of the electrode connection section 30 in the first direction. This can improve the stability and reliability of the welding between the electrode 203 and the electrode connection section 10.

[0067] Furthermore, the insulating member 201 includes a main body 2012 and a protrusion 2011. The main body 2012 is at least partially disposed on both sides of the protrusion 2011 in a second direction. The protrusion 2011 has a pole hole 202. The pole 203 passes through the pole hole 202 and is electrically connected to the pole connecting section 10. The protrusion 2011 protrudes towards the adapter piece 100 relative to the main body 2012 in a first direction. The adapter piece 100 is spaced apart from both the main body 2012 and the protrusion 2011. The pole connecting section 10 corresponds to and is spaced apart from the protrusion 2011 in the first direction. The tab connecting section 30 includes at least one step 31 along the second direction. The step 31 furthest from the pole connecting section 10 in the first direction corresponds to and is spaced apart from the main body 2012 in the first direction.

[0068] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "circumferential", "radial", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0070] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A single-cell battery, characterized in that, include: Cover plate assembly, including pole post; Electrode assembly, including tabs; An adapter piece, disposed on the side of the cover plate assembly facing the electrode assembly, and comprising: A pole connection section is connected to the pole. A tab connecting section is provided, which is connected to both sides of the pole connecting section. Both sides of the pole connecting section are connected to the tab. The tab connecting section protrudes towards the cover plate assembly in a first direction relative to the pole connecting section, wherein the first direction is the thickness direction of the cover plate assembly. The maximum distance between the pole connecting section and the cover plate assembly in the first direction is a, and the maximum protrusion height of the tab connecting section relative to the pole connecting section in the first direction is b. a and b satisfy the relationship: 0.4≤b / a<1.

2. The single-cell battery according to claim 1, characterized in that, The electrode connecting section includes multiple stepped portions connected in a second direction. Among two adjacent stepped portions, the one further away from the electrode connecting section protrudes towards the cover plate assembly in the first direction relative to the other. The second direction is the width direction of the cover plate assembly.

3. The single-cell battery according to claim 2, characterized in that, The electrode connecting section includes a first step portion and a second step portion arranged adjacent to each other. The first step portion is connected between the second step portion and the electrode connecting section. The electrode connecting section is connected to the first step portion through a first bending transition portion, and the first step portion is connected to the second step portion through a second bending transition portion.

4. The single-cell battery according to claim 3, characterized in that, The protrusion height of the first stepped portion relative to the pole connecting section in the first direction is c, where c and a satisfy the relationship: 0.1 ≤ c / a ≤ 0.35; and / or The protrusion height of the second step relative to the first step in the first direction is d, and d and a satisfy the relationship: 0.1≤d / a≤0.

35.

5. The single-cell battery according to claim 1, characterized in that, The electrode connecting section consists of a stepped portion and a third bend transition portion, and the stepped portion is connected to the electrode connecting section through the third bend transition portion.

6. The single-cell battery according to claim 1, characterized in that, The tab connecting section includes at least one stepped portion along the second direction. The stepped portion furthest from the pole connecting section in the first direction is welded to the tab to form a tab welding area. The pole connecting section is welded to the pole to form a pole welding area. The tab welding area and the pole welding area are spaced apart by orthographic projection on the same plane along the first direction. A through hole is provided between the tab welding area and the pole welding area. The second direction is the width direction of the cover plate assembly.

7. The single-cell battery according to claim 6, characterized in that, The dimension of the through hole along the third direction is g, and the distance between the two opposite edges of the adapter piece in the region where the through hole is located along the third direction is h, where 0.5≤h / g≤0.85, and the third direction is the length direction of the cover plate assembly and is perpendicular to the second direction.

8. The single-cell battery according to claim 7, characterized in that, The electrode connecting section consists of a stepped portion and a third bend transition portion. The stepped portion is connected to the electrode connecting section through the third bend transition portion. The stepped portion is connected to the electrode lug. The through hole is opened in the third bend transition portion.

9. The single-cell battery according to claim 7, characterized in that, The electrode connecting section includes a first step portion and a second step portion arranged adjacent to each other. The first step portion is connected between the second step portion and the electrode connecting section. The electrode connecting section is connected to the first step portion through a first bending transition portion. The first step portion and the second step portion are connected through a second bending transition portion. The second step portion is connected to the electrode lug. The through hole is formed in the first step portion.

10. The single-cell battery according to any one of claims 1-9, characterized in that, It also includes an insulating member disposed on a side wall of the cover plate assembly facing the electrode assembly along the first direction. The insulating member includes a main body and a protrusion. The main body is at least partially disposed on both sides of the protrusion along the second direction. The electrode post passes through the protrusion and is connected to the electrode post connecting section. The protrusion protrudes towards the electrode assembly relative to the main body in the first direction. The pole connecting section and the protrusion are corresponding to each other in a first direction and are spaced apart. The pole connecting section includes at least one stepped portion along a second direction. The stepped portion that is furthest from the pole connecting section in the first direction is corresponding to the main body portion in the first direction and is spaced apart.

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