A battery

Abstract

The utility model relates to new energy battery technical field discloses a battery, including: at least one end on;Adapter piece, its setting in the cell body one side along first direction, adapter piece has first area and second area, second area sets up first area on other edge except the edge in second direction, first area is used for with the material board connection, the tab portion is bent to the second area and is away from the cell body one side along first direction, the tab portion at least one part covers and connects on the surface of second area away from the cell body, the bending position of tab portion is in second area along second direction at least one side. The utility model can reduce the risk of cutting of first area to the main overcurrent area between tab portion and cell body, ensure that tab portion has stable and reliable overcurrent performance, reduce the abnormal heating of tab portion due to the poor current transmission.

Description

Technical Field

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

[0002] Currently, to improve the space utilization of batteries in the vertical direction, the tabs are usually bent above the adapter plate and laid on the upper surface of the adapter plate, then welded to the tabs. However, this structural method can cause the tabs to split, affecting the current transmission performance between the tabs and the battery cell, causing the tabs to overheat, and even triggering battery thermal runaway, posing a safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a battery that reduces the risk of the tabs being cut and improves battery safety.

[0004] To achieve the above objectives, this utility model provides a battery, comprising:

[0005] A battery cell includes a cell body and a tab, wherein the tab is disposed on at least one end of the cell body along a first direction;

[0006] An adapter piece is disposed on one side of the cell body along the first direction. The adapter piece has a first region and a second region. The first region is disposed on the edge of the second region other than the edge in the second direction. The tab is bent to the side of the second region away from the cell body along the first direction. At least a portion of the tab covers and is connected to the surface of the second region away from the cell body. The bending position of the tab is at least one side of the second region along the second direction.

[0007] The first direction and the second direction intersect.

[0008] This utility model provides a battery, which has the following advantages compared with the prior art:

[0009] The battery of this utility model includes a cell and an adapter plate. The cell includes a cell body and a tab. The adapter plate includes a second region and a first region disposed on the second region. The tab is bent to the side of the second region away from the cell body. The position of the first region avoids the bending position of the tab, reducing the risk of the first region cutting the main current-carrying area between the tab and the cell body, reducing the occurrence of tearing damage to the tab, ensuring that the tab has stable and reliable current-carrying performance, reducing abnormal heating of the tab due to poor current transmission, reducing the risk of thermal runaway of the battery, and improving battery safety. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the internal structure of the battery according to an embodiment of the present invention.

[0011] Figure 2 yes Figure 1 Sectional view at point AA.

[0012] Figure 3 yes Figure 2 Enlarged diagram of point B in the middle.

[0013] Figure 4 yes Figure 2 An enlarged schematic diagram of point B in another form of the auricle.

[0014] Figure 5 This is a schematic diagram of the structure of the adapter piece according to an embodiment of the present invention.

[0015] Figure 6 yes Figure 5 Enlarged diagram of point C in the middle.

[0016] Figure 7 yes Figure 1 Sectional view at point DD.

[0017] Figure 8 yes Figure 7 Enlarged diagram of point E in the middle.

[0018] Figure 9 yes Figure 3 Enlarged schematic diagram at point F in the middle.

[0019] Figure 10 yes Figure 3 An enlarged schematic diagram of F in another form of the first region.

[0020] In the diagram, 1 is the battery cell; 2 is the adapter piece; 11 is the battery cell body; 12 is the electrode tab; 21 is the second region; 22 is the first region; 211 is the first part; 212 is the second part; 2111 is the first edge; Z is the first direction; Y is the second direction; X is the third direction. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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. They do not 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. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] like Figure 1 As shown, a battery according to an embodiment of the present invention includes: a battery cell 1 and an adapter piece 2.

[0027] The battery cell 1 includes a battery cell body 11 and a tab 12, the tab 12 being disposed on at least one end of the battery cell body 11 along a first direction Z.

[0028] The battery cell body 11 includes a separator and two types of electrodes with opposite polarities, namely a positive electrode and a negative electrode. It operates by the movement of metal ions between the positive and negative electrodes. The cycling process of the battery cell body 11 is the process of metal ions moving from the positive electrode to the negative electrode and then from the negative electrode to the positive electrode. Each electrode includes a current collector and an active material layer, with the active material layer coated on the surface of the current collector. The tab serves as the current output terminal of the battery cell, and is either integrally connected to the positive or negative electrode or connected separately. The connection point between the active material layer on the current collector and the tab is the root of the tab. If the electrode is a positive electrode, the current collector material can be aluminum, and the active material layer material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. If the electrode is a negative electrode, the current collector material can be copper, and the active material layer material can be carbon or silicon, etc.

[0029] In this embodiment, the height direction of the battery casing is the first direction Z, the width direction of the battery casing is the second direction Y, and the length direction of the battery casing is the third direction X. The first direction Z, the second direction Y, and the third direction X intersect each other, and in this embodiment, they are set to be perpendicular to each other, which means that the angle is between 85° and 95°.

[0030] Both cell 1 and adapter plate 2 are housed in the battery casing.

[0031] The battery cell 1 also includes tabs 12, which are electrically connected to the electrode plates. Specifically, the positive tab 12 is electrically connected to the positive electrode plate, and the negative tab 12 is electrically connected to the negative electrode plate. The battery cell body 11 is charged and discharged through the positive and negative tabs 12. The tabs 12 are components formed by stacking and connecting the areas of the electrode plates that are not coated with the positive active material layer, and are used to connect the battery terminals.

[0032] Please refer to Figure 2 and Figure 3 The adapter piece 2 is disposed on one side of the cell body 11 along the first direction Z. The adapter piece 2 has a second region 21 and a first region 22. The first region 22 is disposed on the edge of the second region 21 other than the edge in the second direction Y. The first region 22 is used to connect with the material plate. The tab 12 is bent to the side of the second region 21 away from the cell body 11 along the first direction Z. At least a portion of the tab 12 covers and is connected to the surface of the second region 21 away from the cell body 11. The bending position of the tab 12 is at least on one side of the second region 21 along the second direction Y.

[0033] The second region 21 is the body of the adapter piece 2, and the first region 22 is the material-carrying point on the adapter piece 2, which is the structure left over from the cutting of the adapter piece 2 for connecting the material plate.

[0034] Due to manufacturing limitations, before the adapter piece 2 is completely cut from the material plate, there are material-carrying points on its outer edge. These material-carrying points are part of the first region 22 in this embodiment, which is used for connection with the material plate. These material-carrying points are located at the bend of the tab 12 and directly contact the tab 12, easily cutting it and affecting the current transmission performance between the tab 12 and the cell 1. This can cause the tab 12 to overheat, and even lead to battery thermal runaway, posing a safety hazard.

[0035] The adapter plate 2 facilitates the connection of the tab 12 to the terminal post, enabling external devices to connect to the electrical wiring inside the battery casing via the terminal post. For connections between tabs 12 and terminals of different polarities, adapter plates 2 are typically provided separately.

[0036] In this embodiment, according to Figure 1In the view shown, the adapter plate 2 is positioned above the cell body 11. In order to improve the space utilization of the battery in the height direction, the tab 12 is bent from one side of the adapter plate 2 to the top of the adapter plate 2 between the adapter plate 2 and the cell body 11. The tab 12 covering the top of the adapter plate 2 is welded to the upper surface of the adapter plate 2.

[0037] The first region 22 is a structure left on the edge of the second region 21 during the manufacturing process of the adapter piece 2. It is usually located on the outer edge of the second region 21. The first region 22 is not located on the edge corresponding to the bending position of the tab 12, so that the position of the first region 22 avoids the bending position of the tab 12. This reduces the risk of the first region 22 cutting the main current-carrying area between the tab 12 and the cell body 11, reduces the possibility of tearing damage to the tab 12, ensures that the tab 12 has stable and reliable current-carrying performance, reduces abnormal heating of the tab 12 due to poor current transmission, reduces the risk of thermal runaway of the battery, and improves the safety of the battery.

[0038] In some embodiments, the second region 21 includes a first part 211 and a second part 212. At least a portion of the tab 12 covers and is connected to the first part 211. One end of the first part 211 in the third direction X is connected to the second part 212. The other end of the first part 211 in the third direction X is referred to as the first edge 2111. The first edge 2111 is provided with the first region 22.

[0039] The first part 211 is used to cover and weld the electrode tab 12, and the second part 212 is used to connect the electrode post. The first region 22 is only set on the first edge 2111, which not only avoids the bending position of the electrode tab 12, but also facilitates the arrangement of the adapter piece 2 on the material plate during the processing.

[0040] In this embodiment, there are two first parts 211 and one second part 212. This is because two battery cells 1 are provided in this embodiment, and the electrode portion 12 of each battery cell 1 is connected to one first part 211. In other embodiments, other numbers of first parts 211 may also be provided.

[0041] The first region 22 protrudes beyond the first edge 2111 in the third direction X, and the end of the tab 12 near the first region 22 in the third direction X protrudes beyond the edge of the first region 22 in the third direction X, and at least a portion of the first region 22 is covered by the tab 12.

[0042] In this embodiment, the shape of the first region 22 is a protrusion on the first edge 2111, and the part of the electrode tab 12 that is bent above the adapter piece 2 is larger in size, which can completely cover the first part 211 and the first region 22.

[0043] Please follow Figure 5and Figure 6 The distance between the edge of the first part 211 on the side closer to the first region 22 in the second direction Y and the first region 22 is a mm, and the dimension of the first part 211 in the second direction Y is c mm, satisfying: 0.06≤a / c≤0.85. Preferably, a / c can take values ​​such as 0.052, 0.06, 0.09, 0.18, 0.247, 0.356, 0.541, 0.776, 0.85, 0.859, etc.

[0044] When a / c meets the above range, it satisfies the manufacturing process requirements of the adapter piece 2 and effectively reduces the impact of damage to the tab 12 on the overcurrent capacity between the tab 12 and the cell body 11. If the value is too small, the first region 22 will be too small, significantly increasing the difficulty of the manufacturing process and making it difficult to ensure the smooth progress of the production process; if the value is too large, it will increase the risk of the tab 12 being cut, affecting the conductivity of the tab 12 and the safety of the battery.

[0045] When measuring dimensions a and c, general length measuring tools such as rulers and tape measures can be used.

[0046] Specifically, when measuring a, take the adapter piece 2, and mark the edge of the first part 211 on the side of the first region 22 in the second direction Y as the reference edge. Measure the distance between the edge of the first region 22 on the side of the first region 22 on the second direction Y and the reference edge using a length measuring tool. Take multiple measurements and average the result to obtain the distance a mm between the edge of the first part 211 on the side of the first region 22 on the second direction Y and the first region 22.

[0047] When measuring c, take the adapter piece 2 and use a length measuring tool to measure the distance between the two ends of the first part 211 in the second direction Y. Take multiple measurements and take the average value to obtain the dimension c mm of the first part 211 in the second direction Y.

[0048] The distance amm between the edge of the first part 211 on the side closer to the first region 22 in the second direction Y and the first region 22 also satisfies: 1≤a≤18. Preferably, a can take values ​​such as 0.5, 1, 2, 4, 8, 12, 15, 18, 19, etc.

[0049] When a meets the above range, it can not only meet the manufacturing process requirements of the adapter piece 2, but also effectively reduce the impact of damage to the tab 12 on the overcurrent capacity between the tab 12 and the cell body 11.

[0050] The first part 211 has a dimension of c mm in the second direction Y, and also satisfies: 5≤c≤24. Preferably, c can take values ​​of 4, 5, 8, 10, 14, 17, 20, 22, 24, 25, etc.

[0051] When c meets the above range, the adapter plate 2 can provide sufficient welding area for the tab 12 to ensure the overcurrent between the tab 12 and the adapter plate 2.

[0052] Please refer to Figure 9 The dimension of the first region 22 in the second direction Y is e mm, satisfying: 1≤e≤10. Preferably, e can take values ​​such as 0.5, 1, 2, 4, 6, 8, 10, 11, etc.

[0053] When e meets the above range, it satisfies the manufacturing process requirements of the adapter piece 2 and effectively reduces the impact of damage to the tab 12 on the overcurrent capacity between the tab 12 and the cell body 11. If the value is too small, the size of the first region 22 will be too small, significantly increasing the difficulty of the manufacturing process and making it difficult to ensure the smooth progress of the production process. If the value is too large, it will increase the overlap between the first region 22 and the tab 12. Due to the process, the first region 22 will have more burrs on its structure than the second region 21, increasing the risk of the tab 12 being cut and affecting the conductivity of the tab 12 and the safety of the battery.

[0054] When measuring dimension e, a general length measuring tool can be used, such as a ruler or tape measure.

[0055] When measuring e, take the adapter piece 2 and use a length measuring tool to measure the distance between the two ends of the first region 22 in the second direction Y. Take multiple measurements and take the average value to obtain the size e mm of the first region 22 in the second direction Y.

[0056] The distance between the edge of the first region 22 on the side away from the first part 211 and the first edge 2111 in the third direction X is b mm, satisfying: 0.05≤b≤1. Preferably, b can take values ​​such as 0.035, 0.05, 0.1, 0.28, 0.43, 0.68, 0.8, 0.92, 1, 1.04, etc.

[0057] When b meets the above range, it satisfies the manufacturing process requirements of the adapter piece 2 and effectively reduces the impact of damage to the tab 12 on the overcurrent capacity between the tab 12 and the cell body 11. If the value is too small, the size of the first region 22 will be too small, significantly increasing the difficulty of the manufacturing process and making it difficult to ensure the smooth progress of the production process. If the value is too large, it will increase the overlap between the first region 22 and the tab 12. Due to the process, the first region 22 will have more burrs on its structure than the second region 21, increasing the risk of the tab 12 being cut and affecting the conductivity of the tab 12 and the safety of the battery.

[0058] When measuring dimension b, a general length measuring tool can be used, such as a ruler or tape measure.

[0059] When measuring b, take the adapter piece 2, and take the edge of the first region 22 away from the second region 21 on the third direction X as the reference edge. Measure the distance between the reference edge and the first edge 2111 on the third direction X using a length measuring tool. Take multiple measurements and average the result to obtain the distance b mm between the edge of the first region 22 away from the first part 211 and the first edge 2111 on the third direction X.

[0060] In some embodiments, the first region 22 protrudes beyond the first edge 2111 in the third direction X, and the end of the electrode 12 near the first region 22 in the third direction X protrudes beyond the edge of the first region 22 in the third direction X, with a gap between the first region 22 and the electrode 12.

[0061] Although the first region 22 is a protrusion on the first edge 2111, the portion of the tab 12 that bends over the adapter piece 2 is not large and can only cover a part of the first part 211. The tab 12 is spaced apart from the first region 22, thereby reducing the risk of the tab 12 being cut.

[0062] The distance between the end of the tab 12 near the first region 22 in the second direction Y and the first region 22 in the second direction Y is d mm, satisfying: 0.2≤d≤12. Preferably, d can take values ​​such as 0.15, 0.2, 0.8, 2.1, 3.3, 5.1, 6.6, 8.4, 10, 11.4, 12, 12.5, etc.

[0063] When value d meets the above range, it can reduce the risk of cutting the tab 12 while ensuring the welding area between the adapter piece 2 and the tab 12, thereby ensuring the current carrying capacity between the adapter piece 2 and the tab 12. If the value is too small, the distance between the tab 12 and the first region 22 is small, and during assembly or use, the edge of the first region 22 is very easy to scratch or cut the tab 12, resulting in cuts on the surface of the tab 12. If the value is too large, the portion of the tab 12 covering the adapter piece 2 is small, the welding area between the tab 12 and the adapter piece 2 is too small, the current transmission efficiency decreases, and the current carrying capacity is insufficient.

[0064] When measuring dimension d, a general length measuring tool can be used, such as a ruler or tape measure.

[0065] When measuring d, the edge of the first region 22 near the tab 12 in the second direction Y is taken as the reference edge. The distance between the edge of the tab 12 near the first region 22 in the second direction Y and the reference edge in the second direction Y is measured by a length measuring tool. The average value is taken after multiple measurements to obtain the distance d mm between the end of the tab 12 near the first region 22 in the second direction Y and the first region 22 in the second direction Y.

[0066] In some embodiments, the first region 22 protrudes beyond the edge of the first portion 211 in a third direction X. In this embodiment, the first region 22 is shaped as a protrusion on the first edge 2111.

[0067] The edge of the tab 12 near the first region 22 in the third direction X is located on the first edge 2111, or the edge of the tab near the first region 22 in the third direction X is located on the side of the first edge 2111 away from the first region 22.

[0068] With this structure, the tab 12 will not be too large, nor will it cover the first region 22, thereby reducing the risk of the tab 12 being cut.

[0069] In some embodiments, please refer to Figure 7 and Figure 8 The distance between the surface of the first part 211 facing the cell body 11 and the root of the tab part 12 in the first direction Z is f mm, which satisfies: 0.3≤f≤6. Preferably, f can take values ​​such as 0.24, 0.3, 0.5, 1, 2.7, 3, 4.2, 5, 6, 6.2, etc.

[0070] When f meets the above range, it can reduce the risk of the tab 12 below the adapter 2 being cut, and also ensure the space utilization rate of the battery. If the value is too small, the tab 12 below the adapter 2 will lack sufficient space and be easily scratched by the first area 22, resulting in the tab 12 being cut. If the value is too large, it will occupy too much internal battery space, reduce the compactness of the internal battery layout, and decrease the internal battery space utilization rate.

[0071] In some embodiments, please refer to Figure 9 The first region 22 protrudes beyond the second region 21 in the third direction X, and the corner of the first region 22 facing away from the second region 21 is a right angle.

[0072] Given that the shape of the first region 22 is a protrusion on the first edge 2111, this structure simplifies the manufacturing process. The right-angle structure conforms to the process characteristics of conventional machining and can be quickly formed directly through standard processes such as stamping and cutting. It does not require complex curved surface processing or special molds, effectively reducing processing difficulty, improving production efficiency, and reducing the risk of dimensional deviation caused by complex shape processing, thereby improving the processing accuracy and yield of the product.

[0073] In some embodiments, please refer to Figure 10 The first region 22 protrudes beyond the second region 21 in the third direction X, and the corner of the first region 22 on the side away from the second region 21 is rounded.

[0074] The shape of the first region 22 is a protrusion on the first edge 2111. This structure effectively eliminates the sharp corners of the right-angle structure and reduces the risk of cutting the tab 12 when in contact with it through a smooth transition. This provides a safer assembly and use environment for the tab 12 and ensures the integrity and electrical performance stability of the battery assembly.

[0075] The radius of the fillet is r mm, satisfying: 0.05 ≤ r ≤ 0.6. Preferably, r can take values ​​such as 0.048, 0.05, 0.1, 0.23, 0.32, 0.44, 0.59, 0.6, and 0.65.

[0076] When r meets the above range, it can not only reduce the risk of cuts to the tab 12, but also reduce the processing difficulty. If the value is too small, the edges and corners of the first region 22 will still be relatively sharp, and there is still a risk of cutting the tab during assembly or operation. If the value is too large, the processing difficulty will increase, and the forming accuracy will be difficult to control.

[0077] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery, characterized in that, include: A battery cell includes a cell body and a tab, wherein the tab is disposed on at least one end of the cell body along a first direction; An adapter piece is disposed on one side of the cell body along the first direction. The adapter piece has a first region and a second region. The first region is disposed on the edge of the second region other than the edge in the second direction. The tab is bent to the side of the second region away from the cell body along the first direction. At least a portion of the tab covers and is connected to the surface of the second region away from the cell body. The bending position of the tab is at least one side of the second region along the second direction. The first direction and the second direction intersect.

2. The battery according to claim 1, characterized in that: The second region includes a first part and a second part. At least a portion of the tab covers and is connected to the first part. The first part is connected to the second part at one end in the third direction. The other end of the first part in the third direction is referred to as the first edge. The first region is provided on the first edge. The first direction, the second direction, and the third direction intersect each other.

3. The battery according to claim 2, characterized in that: The first region protrudes beyond the first edge in the third direction, and the end of the electrode near the first region in the third direction protrudes beyond the edge of the first region in the third direction, and at least a portion of the first region is covered by the electrode. The distance between the edge of the first part on the side closer to the first region in the second direction and the first region is a mm, and the size of the first part in the second direction is c mm, satisfying: 0.06≤a / c≤0.

85.

4. The battery according to claim 3, characterized in that: The first region has a size of e mm in the second direction, which satisfies: 1≤e≤10.

5. The battery according to claim 2, characterized in that: The first region protrudes beyond the first edge in the third direction, and the end of the electrode near the first region in the third direction protrudes beyond the edge of the first region in the third direction, and at least a portion of the first region is covered by the electrode. The distance between the edge of the first region away from the first part and the first edge in the third direction is b mm, which satisfies: 0.05≤b≤1.

6. The battery according to claim 2, characterized in that: The first region protrudes beyond the first edge in the third direction, and the end of the electrode portion near the first region in the third direction protrudes beyond the edge of the first region in the third direction, with a gap between the first region and the electrode portion. The distance between the end of the electrode near the first region in the second direction and the first region in the second direction is d mm, which satisfies: 0.2≤d≤12.

7. The battery according to claim 2, characterized in that: The first region protrudes upward from the edge of the first part in the third direction; The electrode tab is located on the first edge at one end of the third side facing upward toward the first region, or the electrode tab is located on the side of the first edge away from the first region at one end of the third side facing upward toward the first region.

8. The battery according to claim 2, characterized in that: The distance between the side surface of the first part facing the cell body and the root of the tab in the first direction is f mm, which satisfies: 0.3≤f≤6.

9. The battery according to claim 1, characterized in that: The first region protrudes upward from the second region on the third side, and the corner of the first region facing away from the second region is a right angle.

10. The battery according to claim 1, characterized in that: The first region protrudes upward from the second region on the third side, and the corner of the first region facing away from the second region is rounded.

11. The battery according to claim 10, characterized in that: The radius of the fillet is r mm, which satisfies: 0.05≤r≤0.6.

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