Connecting piece, battery and energy storage device

Abstract

The utility model discloses a connecting piece, a battery and an energy storage device, the connecting piece comprises a pole connecting part, tab connecting parts and transition connecting parts, the number of the tab connecting parts is two, the tab connecting parts are respectively connected to two opposite sides of the pole connecting part along a first direction, the transition connecting parts are connected between each tab connecting part and the pole connecting part, and the tab connecting parts are connected with the pole connecting part along the first direction. And a fusing hole is formed in the transition connecting part. According to the connecting piece disclosed by the embodiment of the utility model, the tab connecting parts of the connecting piece are connected to the two opposite sides of the pole connecting part along the first direction and are positioned on the same side of the pole connecting part along the second direction, and the fusing holes are formed in the transition connecting parts connected between the tab connecting parts and the pole connecting part; the fusing hole is formed in the transition connecting part with relatively concentrated current and relatively high temperature, so that the connecting sheet can be rapidly fused at or near the fusing hole in the working process of the battery when the current is relatively large and the temperature is relatively high, and the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a connecting piece, a battery and an energy storage device. Background Art

[0002] In the related art, a connecting piece is usually arranged inside a battery to electrically connect a pole column and a pole ear. In order to meet the overcurrent and short-circuit tests, a fusing hole is usually arranged on the connecting piece to quickly fuse when the current is large and the temperature is high, so as to ensure the safety of the battery. However, in the related art, the position of the fusing hole on the connecting piece is not set reasonably enough, resulting in that the connecting piece cannot be quickly fused in time when the current is large and the temperature is high, affecting the safety performance of the battery. Content of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a connecting piece. The pole ear connecting part of the connecting piece is connected to the opposite sides of the pole column connecting part along the first direction and is located on the same side of the pole column connecting part along the second direction. By arranging a fusing hole on the transition connecting part connecting the pole ear connecting part and the pole column connecting part, and arranging the fusing hole on the transition connecting part where the current is more concentrated and the temperature is higher, during the working process of the battery, when the current is large and the temperature is high, the connecting piece can be quickly fused at or near the position of the fusing hole, improving the safety of the battery.

[0004] The utility model also provides a battery with the above connecting piece.

[0005] The utility model also provides an energy storage device with the above battery.

[0006] The connecting piece according to the first aspect embodiment of the utility model includes: a pole column connecting part; a pole ear connecting part, there are two pole ear connecting parts which are respectively connected to the opposite sides of the pole column connecting part along the first direction, both of the two pole ear connecting parts extend along the second direction and are located on the same side of the pole column connecting part along the second direction, the two pole ear connecting parts are opposite and spaced apart in the first direction, and the second direction intersects with the first direction; a transition connecting part, a transition connecting part is connected between each pole ear connecting part and the pole column connecting part, and a fusing hole is arranged on the transition connecting part.

[0007] According to the connecting piece of the embodiment of the utility model, by arranging a fusing hole on the transition connecting part connecting the pole ear connecting part and the pole column connecting part, and arranging the fusing hole on the transition connecting part where the current is more concentrated and the temperature is higher, during the working process of the battery, when the current is large and the temperature is high, the connecting piece can be quickly fused at or near the position of the fusing hole, improving the safety of the battery.

[0008] According to some embodiments of the present utility model, the transition connection part has an outer corner and an inner corner arranged opposite to each other. The vertex of the outer corner is the outer angle vertex, and the vertex of the inner corner is the inner angle vertex. The straight line passing through the outer angle vertex and the inner angle vertex is the diagonal line, and the fuse hole is adjacent to the diagonal line;

[0009] Wherein, when chamfering the outer corner, the intersection point of the extension lines of the two sides of the outer corner forms the outer angle vertex; when chamfering the inner corner, the intersection point of the extension lines of the two sides of the inner corner forms the inner angle vertex;

[0010] When rounding the outer corner, the intersection point of the tangents of the two endpoints of the outer corner forms the outer angle vertex; when rounding the inner corner, the intersection point of the tangents of the two endpoints of the inner corner forms the inner angle vertex.

[0011] According to some embodiments of the present utility model, the outer corner has a first endpoint and a second endpoint, the inner corner has a third endpoint and a fourth endpoint. The connection line between the first endpoint and the third endpoint is the first connection line, and the connection line between the second endpoint and the fourth endpoint is the second connection line. The second connection line is opposite to and spaced from the first connection line. The area enclosed by the outer corner, the inner corner, the first connection line, and the second connection line is the corner area, and at least part of the fuse hole is located in the corner area.

[0012] According to some embodiments of the present utility model, the fuse hole is located on one side of the diagonal line, and the minimum distance a between the fuse hole and the diagonal line is less than 10 mm. The distance between the fuse hole and the diagonal line refers to the distance from the contour edge of the fuse hole to the diagonal line; or, the diagonal line passes through the fuse hole.

[0013] According to some embodiments of the present utility model, the fuse hole is located on the side of the diagonal line close to the tab connection part.

[0014] According to some embodiments of the present utility model, the minimum distance between the fuse hole and the outer corner is d1, and the minimum distance between the fuse hole and the inner corner is d2. The ratio range of d2 to d1 is 0 to 1. The distance between the fuse hole and the outer corner refers to the distance from the contour edge of the fuse hole to the outer corner, and the distance between the fuse hole and the inner corner refers to the distance from the contour edge of the fuse hole to the inner corner.

[0015] According to some embodiments of the present utility model, the ratio range of d2 to d1 is 0.5 to 0.8.

[0016] According to some embodiments of the present utility model, the distance between the fusing hole and the outer corner is d1, and d1 is less than 16 mm.

[0017] According to some embodiments of the present utility model, the inner corner and / or the outer corner is a rounded corner.

[0018] According to some embodiments of the present utility model, the radius of the inner corner is 1 mm to 18 mm; and / or, the arc length of the inner corner is 1.5 mm to 30 mm.

[0019] According to some embodiments of the present utility model, the radius of the outer corner is 10 mm to 30 mm; and / or, the arc length of the outer corner is 15 mm to 50 mm.

[0020] According to some embodiments of the present utility model, the cross-sectional area of the transition connection part is larger than that of the tab connection part and not less than that of the terminal connection part. The cross-section obtained by intercepting the connection piece with a plane perpendicular to the extension direction of the connection piece is the cross-section.

[0021] The battery according to the embodiment of the second aspect of the present utility model includes: a battery case provided with a terminal; an electric core disposed in the battery case and having tabs; a connection piece according to the above-mentioned first aspect embodiment of the present utility model, the terminal connection part is connected to the terminal, and the tab connection part is connected to the tab.

[0022] According to the battery of the embodiment of the present utility model, by providing the connection piece according to the above-mentioned first aspect embodiment of the present utility model, the connection piece is provided with a fusing hole on the transition connection part where the current is relatively concentrated and the temperature is relatively high. During the operation of the battery, when the current is large and the temperature is high, the connection piece can be quickly fused at or near the fusing hole position, making the battery safer.

[0023] The energy storage device according to the embodiment of the third aspect of the present utility model includes: a battery according to the above-mentioned second aspect embodiment of the present utility model.

[0024] According to the energy storage device of the embodiment of the present utility model, by providing the battery according to the above-mentioned second aspect embodiment of the present utility model, the connection piece of the battery is provided with a fusing hole on the transition connection part where the current is relatively concentrated and the temperature is relatively high. During the operation of the battery, when the current is large and the temperature is high, the connection piece can be quickly fused at or near the fusing hole position, making the battery safer.

[0025] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0026] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0027] Figure 1 is a connecting piece according to some embodiments of the present utility model;

[0028] Figure 2 is a connecting piece according to other embodiments of the present utility model;

[0029] Figure 3 is a connecting piece according to still other embodiments of the present utility model;

[0030] Figure 4 is a connecting piece according to yet other embodiments of the present utility model;

[0031] Figure 5 is a simulation diagram of the temperature distribution of the connecting piece at a certain current.

[0032] Reference numerals:

[0033] 100, connecting piece;

[0034] 10, pole connection part;

[0035] 20, tab connection part;

[0036] 30, transition connection part; 31, fuse hole; 32, outer corner; 321, first end point; 322, second end point; 33, inner corner; 331, third end point; 332, fourth end point; 34, outer corner vertex; 35, inner corner vertex; 36, diagonal line; 37, first connection line; 38, second connection line; 39, corner area. Detailed implementation manners

[0037] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0038] In the embodiments of the present utility model, the battery cell can be a stacked cell or a wound cell.

[0039] In the related art, a connecting piece is usually arranged inside the battery to electrically connect the pole column and the pole ear. To meet the overcurrent and short-circuit tests, a fusing hole is usually arranged on the connecting piece to quickly fuse when the current is large and the temperature is high, so as to ensure the safety of the battery. However, the connecting piece in the related art cannot fuse quickly in time, which affects the safety performance of the battery. The applicant found that the main reason is that the position of the fusing hole on the connecting piece is not set reasonably enough, resulting in that the connecting piece cannot fuse quickly in time when the current is large and the temperature is high, which affects the safety performance of the battery.

[0040] The inventor of the present application found through in-depth research that, referring to Figure 5 , for a connecting piece generally in a U shape, the transition connecting portion connected between the pole ear connecting portion and the pole column connecting portion has a relatively high temperature and a large heat generation in the temperature distribution of the entire connecting piece, and the current is also concentrated there. For example, referring to Figure 5 ( Figure 5 the unit of the numbers in Figure 5 is °C), Figure 5 is the temperature distribution simulation diagram of the connecting piece under a large current, Figure 5 only shows the temperature distribution of the connecting piece under a certain current, Figure 5 the numbers in

[0041] do not represent the temperature on the connecting piece of the battery during actual use. It can be seen from Figure 5 that the color of the transition connecting portion area is generally red as a whole, while the colors of the pole column connecting portion and the pole ear connecting portion areas are not red, and the temperature of the transition connecting portion is significantly higher than that of the pole ear connecting portion and the pole column connecting portion. Based on this, the present invention provides a connecting piece which is generally in a U shape. By arranging the fusing hole on the transition connecting portion where the current is more concentrated, the temperature is higher, and the heat generation is larger, the connecting piece can quickly fuse at the fusing hole of the transition connecting portion in time when the current is large and the temperature is high, thereby improving the safety of the battery.

[0042] Next, refer to Figures 1-4 to describe the connecting piece 100 according to an embodiment of the present invention.

[0043] The connecting piece 100 according to the first aspect embodiment of the present invention includes: a pole column connecting portion 10, a pole ear connecting portion 20, and a transition connecting portion 30.

[0044] The pole column connecting portion 10 is used to connect the connecting piece 100 to the pole column. By making the connecting piece 100 include the pole column connecting portion 10, the connecting piece 100 can be electrically connected to the pole column.

[0045] Refer to Figures 1-4, there are two tab connection parts 20. The two tab connection parts 20 are respectively connected to the opposite sides of the terminal connection part 10 along the first direction (such as the e1 direction in the attached drawing). The two tab connection parts 20 both extend along the second direction (such as the e2 direction in the attached drawing), and the two tab connection parts 20 are located on the same side of the terminal connection part 10 along the second direction. The two tab connection parts 20 are opposite and spaced apart in the first direction. The second direction intersects the first direction. For example, the second direction can intersect the first direction. Both the first direction and the second direction are perpendicular to the thickness direction of the connection piece 100. By making the tab connection parts 20 be two, the two tab connection parts 20 are opposite and spaced apart along the first direction, and the two tab connection parts 20 are both connected to the tabs of the battery cell. There can be two tabs that are located on the same side of the battery cell and have the same polarity. The two tab connection parts 20 are respectively connected to the two tabs.

[0046] A transition connection part 30 is connected between each tab connection part 20 and the terminal connection part 10. The connection piece 100 includes two transition connection parts 30. The two transition connection parts 30 are respectively connected to the opposite ends of the terminal connection part 10 along the first direction. The two transition connection parts 30 correspond to the two tab connection parts 20 respectively. Each tab connection part 20 is connected to the terminal connection part 10 through the corresponding transition connection part.

[0047] Wherein, a fuse hole 31 is provided on the transition connection part 30. When the connection piece 100 transmits current, the current at the position of the transition connection part 30 is relatively concentrated, the temperature at the position of the transition connection part 30 is relatively high, and the heat generation is relatively large. By providing the fuse hole 31 on the transition connection part 30, and the fuse hole 31 is arranged at the position where the current is relatively concentrated and the temperature is relatively high. In this way, when the current is large and the temperature is high, the connection piece 100 can be more easily and quickly fused at the position of the fuse hole 31 on the transition connection part 30, better realizing the fuse protection and improving the battery safety.

[0048] Optionally, the transition connection part 30 can be in a right-angle corner shape or an arc corner shape.

[0049] According to the connection piece 100 of the embodiment of the present invention, by providing the fuse hole 31 on the transition connection part 30 connected between the tab connection part 20 and the terminal connection part 10, and the fuse hole 31 is arranged on the transition connection part 30 where the current is relatively concentrated and the temperature is relatively high. During the operation of the battery, when the current is large and the temperature is high, the connection piece 100 can be quickly fused at or near the position of the fuse hole 31, improving the safety of the battery.

[0050] According to some embodiments of the present invention, refer to Figures 1-4, the transition connection part 30 has an outer corner 32 and an inner corner 33 which are oppositely arranged. The vertex of the outer corner 32 is the outer angle vertex 34, and the vertex of the inner corner 33 is the inner angle vertex 35. The straight line passing through the outer angle vertex 34 and the inner angle vertex 35 is the diagonal oblique line 36, and the fusing hole 31 is adjacent to the diagonal oblique line 36. Among them, when chamfering the outer corner 32, the intersection point of the extension lines of the two sides of the outer corner 32 forms the outer angle vertex 34. When chamfering the inner corner 33, the intersection point of the extension lines of the two sides of the inner corner 33 forms the inner angle vertex 35; when the outer corner 32 is a rounded chamfer, the intersection point of the tangents of the two endpoints of the outer corner 32 forms the outer angle vertex 34. When the inner corner 33 is a rounded chamfer, the intersection point of the tangents of the two endpoints of the inner corner 33 forms the inner angle vertex 35.

[0051] For example, referring to Figure 1 , when chamfering the outer corner 32, the intersection point of the extension lines of the two sides of the outer corner 32 forms the outer angle vertex 34. The extension lines of the two sides of the outer corner 32 are f1 and f2 respectively, and the intersection point of f1 and f2 forms the outer angle vertex 34.

[0052] For another example, referring to Figures 1-4 , when the outer corner 32 is a rounded chamfer, the intersection point of the tangents of the two endpoints of the outer corner 32 forms the outer angle vertex 34. When the outer corner 32 is a rounded chamfer, the intersection point of the tangents of the two endpoints of the outer corner 32 forms the outer angle vertex 34. The tangents of the two endpoints of the outer corner 32 are f3 and f4 respectively, and the intersection point of f3 and f4 forms the outer angle vertex 34.

[0053] For another example, referring to Figures 1-4 , when the inner corner 33 is a rounded chamfer, the intersection point of the tangents of the two endpoints of the inner corner 33 forms the inner angle vertex 35. The tangents of the two endpoints of the inner corner 33 are f5 and f6 respectively, and the intersection point of f5 and f6 forms the inner angle vertex 35.

[0054] When the connecting piece 100 transmits current, the current at the diagonal oblique line 36 is relatively concentrated and generates relatively high heat. By making the fusing hole 31 adjacent to the diagonal oblique line 36, the fusing hole 31 can be closer to the area with higher heat generation. When the heat generation exceeds the limit value, the area near the fusing hole 31 is more likely to melt and break, improving the safety of the battery.

[0055] According to some embodiments of the present invention, referring to Figure 1 and Figure 4, the outer corner 32 has a first end point 321 and a second end point 322, the inner corner 33 has a third end point 331 and a fourth end point 332. The connection line between the first end point 321 and the third end point 331 is the first connection line 37, and the connection line between the second end point 322 and the fourth end point 332 is the second connection line 38. The second connection line 38 is opposite to and spaced from the first connection line 37. The region surrounded by the outer corner 32, the inner corner 33, the first connection line 37 and the second connection line 38 is the corner region 39, and at least part of the fuse hole 31 is located in the corner region 39. On the transition connection part 30, the current is more concentrated in the region near the corner region 39, and the temperature is relatively higher. By arranging the fuse hole 31 in this region, the connecting piece 100 can be more quickly fused at and near the fuse hole 31, so as to better protect the battery.

[0056] According to some embodiments of the present invention, referring to Figure 2 , the fuse hole 31 is located on one side of the diagonal line 36 and the minimum distance a between the fuse hole 31 and the diagonal line 36 is less than 10 mm. The distance between the fuse hole 31 and the diagonal line 36 refers to the distance from the contour edge of the fuse hole 31 to the diagonal line 36; alternatively, the diagonal line 36 passes through the fuse hole 31. For example, the value of a can be 0 mm, 1 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, etc. When the connecting piece 100 passes through current, the current at the diagonal line 36 is more concentrated, so the heat generated at the diagonal line 36 is higher. By making the distance a between the fuse hole 31 and the diagonal line 36 less than 10 mm, the distance between the fuse hole 31 and the diagonal line 36 will not be too far, and the heat generated in the region near the fuse hole 31 is higher, and it can be more quickly fused when the current is too large.

[0057] According to some embodiments of the present invention, the fuse hole 31 is located on the side of the diagonal line 36 close to the tab connection part 20. By making the fuse hole 31 located on the side of the diagonal line 36 close to the tab connection part 20, the connecting piece 100 can be more quickly fused, reducing the safety risk.

[0058] According to some embodiments of the present invention, the diagonal line 36 passes through the fuse hole 31. When the connecting piece 100 passes through current, the current at the diagonal line 36 is more concentrated, so the heat generated at the diagonal line 36 is higher. By making the diagonal line 36 pass through the fuse hole 31, the heat generated in the region near the fuse hole 31 can be higher, and it can be more quickly fused when the current is too large.

[0059] According to some embodiments of the present invention, referring to Figure 2, the minimum distance between the fusing hole 31 and the outer corner 32 is d1, the minimum distance between the fusing hole 31 and the inner corner 33 is d2, the ratio range of d2 to d1 is 0 to 1. The distance between the fusing hole 31 and the outer corner 32 refers to the distance from the contour edge of the fusing hole 31 to the outer corner 32, and the distance between the fusing hole 31 and the inner corner 33 refers to the distance from the contour edge of the fusing hole 31 to the inner corner 33. For example, the ratio between d2 and d1 can be 0, 0.2, 0.4, 0.6, 0.8, 1, etc. By setting the ratio range of d2 to d1 to 0 to 1, the distance between the fusing hole 31 and the inner corner 33 can be made not greater than the distance between the fusing hole 31 and the outer corner 32. The current on the inner side is relatively more concentrated than that on the outer side. Therefore, when the connecting piece 100 passes through current, the current on the inner side is relatively larger than that on the outer side, and more heat is generated on the inner side than on the outer side. By setting the fusing hole 31 closer to the inner side, the fusing hole 31 can be closer to the inner area with more heat generation, and the area near the fusing hole 31 is more likely to melt when the current passing through the connecting piece 100 is too large.

[0060] According to some embodiments of the present invention, referring to Figure 2 , the ratio range of d2 to d1 is 0.5 to 0.8. For example, the ratio between d2 and d1 can be 0.5, 0.6, 0.7, 0.8, etc. When the connecting piece 100 passes through current, the current at the inner corner 33 is relatively larger than that on the outer side, and more heat is generated on the inner side than on the outer side. By making the ratio of d2 to d1 not exceed 0.8, the fusing hole 31 can be closer to the inner corner 33, making the area near the fusing hole 31 generate more heat, and it can melt more quickly when the current passing through the connecting piece 100 is too large, protecting the safety of the battery. By making the ratio of d2 to d1 not less than 0.5, the distance between the fusing hole 31 and the outer corner 32 will not be too large, so that the fusing hole 31 and the outer corner 32 can melt quickly when the current passing through the connecting piece 100 is relatively large.

[0061] According to some embodiments of the present invention, referring to Figure 2, the distance between the fuse hole 31 and the outer corner 32 is d1, and d1 is less than 16 mm. For example, the value of d1 can be 0 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, etc. The current near the inner corner 33 is more concentrated than that near the outer corner 32. Therefore, when the connecting piece 100 passes through current, the heat generated at the outer corner 32 is lower than that at the inner corner 33. If the distance between the fuse hole 31 and the outer corner 32 is too large, it is more difficult to melt and break between the outer corner 32 and the fuse hole 31. When the connecting piece 100 passes through a large current, the outer corner 32 and the fuse hole 31 cannot be melted and broken in time, and the connecting piece 100 remains in a conductive state for a long time, unable to play the role of fuse protection. By making the distance between the fuse hole 31 and the outer corner 32 less than 16 mm, the distance between the fuse hole 31 and the outer corner 32 can be prevented from being too large, so that the fuse hole 31 and the outer corner 32 can be quickly melted and broken when the battery is short-circuited.

[0062] According to some embodiments of the present invention, referring to Figures 1-4 , the inner corner 33 is a rounded corner. By setting the inner corner 33 as a rounded corner, the current concentration at the inner corner 33 can be appropriately reduced, thereby appropriately reducing the heat generated at the outer corner 32. When the battery is normally charged and discharged, the connecting piece 100 will not be damaged due to overheating. At the same time, since the heat generated when the connecting piece 100 transmits current is reduced, the connecting piece 100 can pass a larger current under the specified heat generation condition.

[0063] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 , the outer corner 32 is a rounded corner. By setting the outer corner 32 as a rounded corner, the current concentration at the outer corner 32 can be appropriately reduced, thereby appropriately reducing the heat generated at the outer corner 32. When the battery is normally charged and discharged, the connecting piece 100 will not be damaged due to overheating; at the same time, since the heat generated when the connecting piece 100 transmits current is reduced, the connecting piece 100 can carry a larger current under the specified heat generation condition.

[0064] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 , both the inner corner 33 and the outer corner 32 are rounded corners. By setting both the inner corner 33 and the outer corner 32 as rounded corners, the current concentration at the inner corner 33 and the outer corner 32 can be appropriately reduced, thereby appropriately reducing the heat generated at the inner corner 33 and the outer corner 32. When the battery is normally charged and discharged, the connecting piece 100 will not be damaged due to overheating; at the same time, since the heat generated when the connecting piece 100 transmits current is reduced, the connecting piece 100 can carry a larger current under the specified heat generation condition.

[0065] According to some embodiments of the present invention, referring toFigure 3 The radius R1 of the inner corner 33 ranges from 1 mm to 18 mm. For example, the radius R1 of the inner corner 33 can be 1 mm, 2 mm, 5 mm, 7 mm, 10 mm, 15 mm, 18 mm, etc. By making the radius R1 of the inner corner 33 not less than 1 mm, the inner corner 33 can fully function to reduce current concentration, ensuring that the connecting piece 100 will not be overheated and damaged during normal charging and discharging of the battery; by making the radius R1 of the inner corner 33 not greater than 18 mm, the connecting piece 100 will not be too large, ensuring that the overall connecting piece 100 will not be too large and can be adaptively installed in the battery.

[0066] According to some embodiments of the present invention, referring to Figure 3 The arc length b1 of the inner corner 33 ranges from 1.5 mm to 30 mm. For example, the arc length b1 of the inner corner 33 is 1.5 mm, 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, 30 mm, etc. By making the arc length b1 of the inner corner 33 not less than 1.5 mm, the inner corner 33 can fully function to reduce current concentration, ensuring that the connecting piece 100 will not be overheated and damaged during normal charging and discharging of the battery; by making the arc length b1 of the inner corner 33 not greater than 30 mm, the connecting piece 100 will not be too large, ensuring that the overall connecting piece 100 will not be too large and can be adaptively installed in the battery.

[0067] According to some embodiments of the present invention, referring to Figure 3 The radius of the outer corner 32 is R2, and the value range of R2 is 10 mm to 30 mm. For example, the radius R2 of the outer corner 32 can be 10 mm, 12 mm, 15 mm, 17 mm, 20 mm, 25 mm, 30 mm, etc. By making the radius R2 of the outer corner 32 not less than 10 mm, the outer corner 32 can fully function to reduce current concentration, ensuring that the connecting piece 100 will not be overheated and damaged during normal charging and discharging of the battery; by making the radius R2 of the outer corner 32 not greater than 30 mm, the connecting piece 100 will not be too large, ensuring that the overall connecting piece 100 will not be too large and can be adaptively installed in the battery.

[0068] According to some embodiments of the present invention, referring to Figure 3, the arc length of the outer corner 32 is b2, and the value range of b2 is 15 mm to 50 mm. For example, the arc length b2 of the outer corner 32 can be 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm. By making the arc length b2 of the outer corner 32 not less than 15 mm, the outer corner 32 can fully play the role of reducing current concentration, ensuring that the connecting piece 100 will not be overheated and damaged during normal charging and discharging of the battery; by making the arc length b2 of the outer corner 32 not greater than 50 mm, the connecting piece 100 will not be too large, ensuring that the whole connecting piece 100 will not be too large and can be adapted and installed into the battery.

[0069] According to some embodiments of the present invention, the cross-sectional area of the transition connection part 30 is larger than the cross-sectional area of the tab connection part 20 and not less than the cross-sectional area of the terminal connection part 10. The cross-section obtained by a plane perpendicular to the extending direction of the connecting piece 100 cutting the connecting piece 100 is the cross-section. When current passes through the connecting piece 100, the current density of the transition connection part 30 is more concentrated. By making the cross-sectional area of the transition connection part 30 larger than the cross-sectional area of the tab connection part 20 and not less than the cross-sectional area of the terminal connection part 10, the transition connection part 30 can pass a larger current, improving the ability of the whole connecting piece 100 to pass a large current. And, by arranging the fusing hole 31 on the transition connection part 30 with a larger cross-sectional area, the current of the transition connection part 30 is more concentrated and the temperature is higher. During the operation of the battery, when the current is large and the temperature is high, the connecting piece 100 can be quickly fused at or near the position of the fusing hole 31, improving the safety of the battery.

[0070] Optionally, the cross-sectional area of the transition connection part 30 can be increased by increasing the width or thickness of the transition connection part 30.

[0071] Optionally, the cross-sectional area of the whole connecting piece 100 can also be increased by increasing the width or thickness of the whole connecting piece 100.

[0072] The battery according to the second aspect embodiment of the present invention includes: a battery case, a battery cell, and the connecting piece 100 according to the first aspect embodiment of the present invention above. The battery case is provided with a terminal, the battery cell is arranged in the battery case and has a tab, the terminal connection part 10 is connected to the terminal, and the tab connection part 20 is connected to the tab.

[0073] The battery according to the embodiment of the present invention, by arranging the connecting piece 100 according to the first aspect embodiment of the present invention above, the fusing hole 31 is arranged on the transition connection part 30 where the current is more concentrated and the temperature is higher. During the operation of the battery, when the current is large and the temperature is high, the connecting piece 100 can be quickly fused at or near the position of the fusing hole 31, making the battery safer.

[0074] The energy storage device according to the third aspect embodiment of the present utility model includes: the battery according to the second aspect embodiment of the present utility model above.

[0075] For the energy storage device according to the embodiment of the present utility model, by providing the battery according to the second aspect embodiment of the present utility model above, a fuse hole 31 is provided on the connecting piece 100 of the battery at the transition connecting portion 30 where the current is relatively concentrated and the temperature is relatively high. During the operation of the battery, when the current is large and the temperature is high, the connecting piece 100 can be quickly fused at or near the position of the fuse hole 31, making the battery safer.

[0076] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0077] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features.

[0078] In the description of the present utility model, the meaning of "a plurality" is two or more.

[0079] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0080] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A connecting sheet, characterized in that: include: Pole connection part; A pole lug connection portion, wherein the pole lug connection portions are two and are respectively connected to opposite sides of the pole column connection portion along the first direction, the two pole lug connection portions both extend along the second direction and are located on the same side of the pole column connection portion along the second direction, the two pole lug connection portions are arranged opposite to each other and spaced apart in the first direction, and the second direction intersects with the first direction; A transition connection portion is connected between each of the pole lug connection portion and the pole connection portion, and a fuse hole is provided on the transition connection portion.

2. The connecting piece according to claim 1, characterized in that: The transition connection portion has an outer corner and an inner corner that are arranged opposite to each other, the vertex of the outer corner is the outer corner vertex, the vertex of the inner corner is the inner corner vertex, the straight line passing through the outer corner vertex and the inner corner vertex is a diagonal oblique line, and the fuse hole is adjacent to the diagonal oblique line; Wherein, when the outer corner is chamfered, the intersection of the extension lines of the two sides of the outer corner constitutes the outer corner vertex, and when the inner corner is chamfered, the intersection of the extension lines of the two sides of the inner corner constitutes the inner corner vertex; When the outer corner is rounded, the intersection of the tangent lines of the two end points of the outer corner constitutes the outer corner vertex, and when the inner corner is rounded, the intersection of the tangent lines of the two end points of the inner corner constitutes the inner corner vertex.

3. The connecting piece according to claim 2, characterized in that: The outer corner has a first endpoint and a second endpoint, the inner corner has a third endpoint and a fourth endpoint, the line between the first endpoint and the third endpoint is the first line, the line between the second endpoint and the fourth endpoint is the second line, the second line is opposite to the first line and is spaced apart, the area enclosed by the outer corner, the inner corner, the first line and the second line is the corner area, and at least part of the fuse hole is located in the corner area.

4. The connecting sheet according to claim 2, characterized in that: The fuse hole is located on one side of the diagonal line and the minimum distance a between the fuse hole and the diagonal line is less than 10 mm. The distance between the fuse hole and the diagonal line refers to the distance from the contour edge of the fuse hole to the diagonal line; or, the diagonal line passes through the fuse hole.

5. The connecting piece according to any one of claims 2 to 4, characterized in that: The fuse hole is located on a side of the diagonal line close to the tab connection portion.

6. The connecting sheet according to claim 2, characterized in that: The minimum distance between the fuse hole and the outer corner is d1, the minimum distance between the fuse hole and the inner corner is d2, the ratio of d2 to d1 ranges from 0 to 1, the distance between the fuse hole and the outer corner refers to the distance from the contour edge of the fuse hole to the outer corner, and the distance between the fuse hole and the inner corner refers to the distance from the contour edge of the fuse hole to the inner corner.

7. The connecting piece according to claim 6, characterized in that: The ratio of d2 to d1 ranges from 0.5 to 0.

8.

8. The connecting sheet according to claim 6, characterized in that: The distance between the fuse hole and the outer corner is d1, and d1 is less than 16 mm.

9. The connecting sheet according to claim 2, characterized in that: The inner corner and / or the outer corner is rounded.

10. The connecting sheet according to claim 9, characterized in that: The radius of the inner corner is 1 mm to 18 mm; and / or the arc length of the inner corner is 1.5 mm to 30 mm.

11. The connecting sheet according to claim 9, characterized in that: The radius of the outer corner is 10 mm to 30 mm; and / or the arc length of the outer corner is 15 mm to 50 mm.

12. The connecting sheet according to claim 1, characterized in that: The cross-sectional area of ​​the transition connection portion is larger than the cross-sectional area of ​​the pole lug connection portion and not smaller than the cross-sectional area of ​​the pole connection portion, and the cross-sectional area obtained by cutting the connection sheet with a plane perpendicular to the extension direction of the connection sheet is the cross-sectional area.

13. A battery, characterized in that: include: A battery housing having a terminal column; A battery cell, disposed in the battery housing and having a tab; According to any one of claims 1 to 12, the pole connecting portion is connected to the pole, and the tab connecting portion is connected to the tab.

14. An energy storage device, characterized in that: include: A battery according to claim 13.

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