Secondary battery

Abstract

The utility model provides a secondary battery, and relates to the technical field of batteries. The adapter piece of the secondary battery is provided with a pole connecting part, a tab connecting part and an auxiliary connecting part, the pole connecting part is used for being connected with a pole; the tab connecting part is used for being connected with a tab; along the first direction, the pole connecting part is connected with the tab connecting part; in the second direction, the width of the tab connecting part is greater than that of the pole connecting part; the first direction is not parallel to the second direction; in the second direction, the auxiliary connecting part is arranged on one side of the pole connecting part; one end of the auxiliary connecting part is connected to the pole connecting part, and the other end is connected to the tab connecting part; and the auxiliary connecting part is used for reducing the temperature rise of the switching sheet. According to the secondary battery, the auxiliary connecting part is used for reducing the temperature rise at the connecting boundary of the pole connecting part and the tab connecting part of the adapter piece, so that the overall temperature of the adapter piece is reduced. In addition, the auxiliary connecting part is arranged, so that the amount of materials removed from the plate through stamping during machining can be reduced, and the material utilization rate is increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a secondary battery. Background Art

[0002] A secondary battery is primarily composed of a housing, a cell, and a top cover. The top cover is equipped with positive and negative pole posts and bosses, which are connected to the cell's tabs via positive and negative adapters and then assembled into the housing to complete the secondary battery.

[0003] As the market demand for fast charging, fast discharging, and high-rate functions of battery cells becomes increasingly urgent, the corresponding temperature rise requirements for structural parts, especially adapters, are also getting higher and higher. The existing technology mainly relies on increasing the thickness of the adapter to reduce the resistance of the adapter, thereby reducing the temperature rise of the adapter. However, due to the power upper limit of laser welding, continuously increasing the thickness of the adapter will result in the weld depth and width not meeting the requirements. Moreover, the existing adapter structure is relatively complex, and a lot of material is removed when stamping the complex-shaped adapter from the sheet, resulting in low material utilization. Utility Model Content

[0004] The purpose of this application is to provide a secondary battery to address the deficiencies in the above-mentioned prior art, which reduces the temperature rise of the adapter by increasing the effective conductive area of ​​the adapter and improves the material utilization rate during the production of the adapter.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0006] An embodiment of the present application provides a secondary battery, comprising: a top cover, on which a pole is provided; a bare cell, which has a tab; the secondary battery also comprises: a transfer plate, which has: a pole connecting portion, a tab connecting portion and an auxiliary connecting portion; the pole connecting portion is used to be connected to the pole; the tab connecting portion is used to be connected to the tab; along a first direction, the pole connecting portion is connected to the tab connecting portion; along a second direction, the width of the tab connecting portion is greater than the width of the pole connecting portion; the first direction and the second direction are not parallel; along the second direction, the auxiliary connecting portion is provided on one side of the pole connecting portion; one end of the auxiliary connecting portion is connected to the pole connecting portion, and the other end is connected to the tab connecting portion; the auxiliary connecting portion is used to reduce the temperature rise of the transfer plate.

[0007] This secondary battery incorporates an auxiliary connector on the adapter plate, which reduces the temperature rise at the junction between the terminal and tab connectors, thereby lowering the overall temperature of the adapter plate. Furthermore, the auxiliary connector reduces the amount of material removed from the regular rectangular sheet during stamping, improving material utilization.

[0008] Optionally, along the second direction, the width of the auxiliary connection portion is less than or equal to the side distance between the pole connection portion and the tab connection portion.

[0009] In this way, the space occupied by the adapter can be reduced and material waste can be reduced.

[0010] Optionally, the auxiliary connecting portion is in a rectangular, triangular or curved shape.

[0011] The auxiliary connecting portion of the above shape is easy to process and can improve the utilization rate of materials or reduce the weight of the adapter while reducing the temperature rise.

[0012] Optionally, a side of the auxiliary connection portion away from the pole connection portion and the tab connection portion has an arc edge.

[0013] The arc edge facilitates processing and also enables the auxiliary connection part to reduce the weight of the adapter while reducing the temperature rise.

[0014] Optionally, the auxiliary connection portion has a through hole, and the through hole is located close to an edge where the auxiliary connection portion is connected to the pole connection portion, and an edge where the auxiliary connection portion is connected to the tab connection portion.

[0015] The provision of the through hole can reduce the weight of the adapter plate. At the same time, the provision position of the through hole ensures that the through hole does not affect the cooling effect of the auxiliary connecting portion.

[0016] Optionally, the through hole is circular or triangular in shape.

[0017] The through hole of the above shape can reduce the weight of the adapter and is easy to process.

[0018] Optionally, there are two poles, which are respectively a positive pole and a negative pole; there are two adapter plates, which are respectively connected to the positive pole and the negative pole; there are at least two bare cells, and each bare cell has a positive pole ear and a negative pole ear; the pole ear connection portion on each adapter plate includes two pole ear sub-connection portions, and along the second direction, the two pole ear sub-connection portions are connected to each other; the two pole ear sub-connection portions on each adapter plate are correspondingly connected to the pole ears with the same polarity; along the first direction, the pole connection portion is respectively connected to the two pole ear sub-connection portions.

[0019] In this way, electrical connection between the tabs and the poles on at least two bare battery cells can be achieved.

[0020] Optionally, the first direction and the second direction are perpendicular to each other.

[0021] In this way, the material utilization rate during the processing of the adapter can be further improved, and the welding of the pole and the tab can be made more flexible.

[0022] Optionally, the tab connection portion is provided with a positioning structure, and the positioning structure is used to position the adapter during welding.

[0023] The positioning structure can realize the rapid positioning of the adapter during welding and ensure the accuracy of the position of the adapter.

[0024] Optionally, the positioning structure is a positioning hole, and is provided at an edge of the tab connection portion away from the pole connection portion; the positioning hole is arc-shaped or triangular; and the positioning hole is provided between two tab sub-connections.

[0025] The positioning hole is set at the edge of the tab connection part away from the pole connection part, and the shape of the positioning hole is limited to an arc or a triangle, which can facilitate the processing of the positioning hole and realize the positioning of the adapter. The positioning hole is set between the two tab sub-connections, which can realize the positioning of the two tab sub-connections at the same time.

[0026] Optionally, the adapter plate further includes an anti-fool-proof structure, which is provided at one end of the pole connection portion away from the pole lug connection portion, and is used to distinguish the positive electrode adapter plate from the negative electrode adapter plate.

[0027] The fool-proof structure can quickly distinguish whether the adapter is a positive adapter or a negative adapter, thereby improving welding efficiency.

[0028] The beneficial effects of this application include:

[0029] The present application provides a secondary battery, comprising: a top cover, on which a pole is provided; a bare cell, which has a tab; the secondary battery further comprising: a transfer plate, which has: a pole connection portion, a tab connection portion, and an auxiliary connection portion; the pole connection portion is used to connect to the pole; the tab connection portion is used to connect to the tab; along a first direction, the pole connection portion is connected to the tab connection portion; along a second direction, the width of the tab connection portion is greater than the width of the pole connection portion; the first direction and the second direction are not parallel; along the second direction, the auxiliary connection portion is provided on one side of the pole connection portion; one end of the auxiliary connection portion is connected to the pole connection portion, and the other end is connected to the tab connection portion; the auxiliary connection portion is used to reduce the temperature rise of the transfer plate. The above-mentioned secondary battery adds an auxiliary connection portion to the transfer plate, and uses the auxiliary connection portion to reduce the temperature rise at the connection boundary between the pole connection portion and the tab connection portion, thereby reducing the overall temperature of the transfer plate. In addition, the provision of the auxiliary connection portion can also reduce the amount of material stamped out from the plate during processing, thereby improving material utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural diagram of an adapter in the prior art;

[0032] Figure 2 A schematic structural diagram of a secondary battery provided in an embodiment of the present application;

[0033] Figure 3 A cross-sectional view of a secondary battery provided in an embodiment of the present application;

[0034] Figure 4 This is one of the structural schematic diagrams of the adapter plate in the secondary battery provided in the embodiment of the present application;

[0035] Figure 5 This is a second structural diagram of the adapter plate in the secondary battery provided in an embodiment of the present application;

[0036] Figure 6 This is a third structural diagram of the adapter plate in the secondary battery provided in an embodiment of the present application;

[0037] Figure 7 This is a fourth structural diagram of the adapter sheet in the secondary battery provided in an embodiment of the present application;

[0038] Figure 8 This is the fifth structural diagram of the adapter plate in the secondary battery provided in the embodiment of the present application.

[0039] Icons: 100-adapter; 110-pole connection area; 120-tab connection area; 10-secondary battery; 11-top cover; 12-pole; 13-bare cell; 131-tab; 14-adapter; 141-pole connection part; 1411-pole weld mark; 142-tab connection part; 1421-tab sub-connection part; 1422-tab weld mark; 143-auxiliary connection part; 1431-arc edge; 1432-through hole; 144-positioning structure; 145-foolproofing structure; A-first direction; B-second direction; C-width of auxiliary connection part; D-side distance between pole connection part and tab connection part; E-length of auxiliary connection part; F-length of pole connection part; G-width of tab connection part; H-width of pole connection part. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application as claimed, but merely represents selected embodiments of the present application. It should be noted that, unless there is a conflict, the various features of the embodiments of the present application may be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0043] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] Please refer to Figure 1The existing adapter 100 has two parts: a pole connection area 110 and a tab connection area 120. The pole connection area 110 and the tab connection area 120 are connected to each other. The pole connection area 110 is also used to connect to the pole, and the tab connection area 120 is also used to connect to the tab. In the prior art, the resistance of the adapter 100 is mainly reduced by increasing the thickness of the adapter 100, thereby reducing the temperature rise of the adapter 100. However, due to the power upper limit of laser welding, continuously increasing the thickness of the adapter 100 will result in the situation where the welding depth and width cannot meet the requirements. In addition, the above-mentioned adapter 100 structure removes a lot of material during processing, and the utilization rate is not high.

[0046] In order to solve the above technical problems, the present invention provides a secondary battery 10. Figure 2 and Figure 3 The secondary battery 10 includes: a top cover 11 on which a pole 12 is provided; a bare cell 13 having a tab 131 ; and a switching piece 14 for electrically connecting the pole 12 and the tab 131 .

[0047] Different from the prior art, please refer to Figure 4 The adapter plate 14 provided in the embodiment of the present application has: a pole connecting portion 141, a tab connecting portion 142 and an auxiliary connecting portion 143; wherein the pole connecting portion 141 is used to connect to the pole 12; the tab connecting portion 142 is used to connect to the tab 131.

[0048] Along the first direction A, the pole connection portion 141 is connected to the tab connection portion 142; along the second direction B, the width G of the tab connection portion is greater than the width H of the pole connection portion; the first direction A and the second direction B are not parallel; along the second direction B, the auxiliary connection portion 143 is provided on one side of the pole connection portion 141; one end of the auxiliary connection portion 143 is connected to the pole connection portion 141, and the other end is connected to the tab connection portion 142. The temperature rise at the junction between the pole connection portion 141 and the tab connection portion 142 is relatively large. Adding the auxiliary connection portion 143 can effectively reduce the temperature rise at the junction, while also reducing the overall temperature of the adapter plate 14.

[0049] In some optional embodiments, the edge of the pole connection portion 141 is connected to the middle area of ​​the edge of the pole lug connection portion 142, and the number of auxiliary connection portions 143 is two. The two auxiliary connection portions 143 are respectively connected to both sides of the pole connection portion 141 along the second direction B, thereby reducing the temperature rise at the connection boundary on both sides of the pole connection portion 141 and improving the cooling effect.

[0050] Furthermore, the midpoint of the edge of the pole connecting portion 141 coincides with the midpoint of the edge of the tab connecting portion 142, and the two auxiliary connecting portions 143 have the same shape and are symmetrically arranged on opposite sides of the pole connecting portion 141. This can make the temperature of the entire adapter 14 more uniform, and can also simplify the shape of the adapter 14, making the adapter 14 easier to process.

[0051] The secondary battery 10 described above has an auxiliary connection portion 143 added to the adapter plate 14. The auxiliary connection portion 143 reduces the temperature rise at the junction between the terminal connection portion 141 and the tab connection portion 142, thereby reducing the overall temperature of the adapter plate 14. Furthermore, the provision of the auxiliary connection portion 143 can also reduce the amount of material removed from the sheet during stamping during processing, thereby improving material utilization.

[0052] In some optional embodiments, please refer to Figure 4 and Figure 5 Along the second direction B, the width C of the auxiliary connection portion is less than or equal to the side distance D between the pole connection portion and the tab connection portion, thereby reducing the space occupied by the adapter 14 and reducing material waste.

[0053] When the width C of the auxiliary connection portion is smaller than the side distance D between the pole connection portion and the tab connection portion, the tab weld mark 1422 is preferably in the area corresponding to the tab connection portion 142 and the auxiliary connection portion 143 along the first direction A, that is, Figure 4 and Figure 5 Thus, the current flow paths are increased as much as possible (as shown by the dotted arrows in the figure), the effective conduction area between the tab 131 and the pole 12 is increased, and the temperature rise is reduced.

[0054] Preferably, along the second direction B, the width C of the auxiliary connection portion is equal to the lateral spacing D between the pole connection portion and the tab connection portion. This arrangement maximizes the current flow path (as indicated by the dashed arrows in the figure), increases the effective conductive area between the tab 131 and the pole 12, and thereby reduces temperature rise. It also allows for greater flexibility in the welding position of the tab 131, unrestricted by the size of the auxiliary connection portion 143. Furthermore, it reduces the amount of material removed during production, improving material utilization.

[0055] In some optional embodiments, along the first direction A, the length E of the auxiliary connection portion is less than or equal to the length F of the pole connection portion, thereby reducing the space occupied by the adapter plate 14 and reducing material waste.

[0056] When the length E of the auxiliary connection portion is less than the length F of the pole connection portion, the pole weld mark 1411 is preferably in the area corresponding to the pole connection portion 141 and the auxiliary connection portion 143 along the second direction B, that is, Figure 4 and Figure 5 Thus, the current flow paths are increased as much as possible (as shown by the dotted arrows in the figure), the effective conduction area between the terminal lug 131 and the terminal column 12 is increased, and the temperature rise is reduced.

[0057] Preferably, along the first direction A, the length E of the auxiliary connection portion is equal to the length F of the pole connection portion. This arrangement maximizes the current flow path (as indicated by the dashed arrows in the figure), increases the effective conductive area between the tab 131 and the pole 12, and thereby reduces temperature rise. It also allows for greater flexibility in the welding position of the pole 12, unrestricted by the size of the auxiliary connection portion 143. Furthermore, it reduces the amount of material removed during production, improving material utilization.

[0058] In some optional embodiments, the auxiliary connection portion 143 is in the shape of a rectangle, a triangle, or a curved edge.

[0059] like Figure 4 and Figure 5 As shown, Figure 4 and Figure 5 The auxiliary connecting portion 143 is in a rectangular shape. The rectangular auxiliary connecting portion 143 can improve the utilization rate of the material and facilitate the processing of the adapter 14. Figure 6 As shown, Figure 6 The auxiliary connection portion 143 is in the shape of a triangle. The triangular auxiliary connection portion 143 can reduce the weight of the adapter 14 while reducing the temperature rise, and is also convenient for processing the adapter 14. Figure 7 As shown, Figure 7 The auxiliary connection portion 143 is in a curved shape, and the edge of the auxiliary connection portion 143 away from the pole connection portion 141 and the tab connection portion 142 is a curved edge, preferably an arc edge 1431. The curved auxiliary connection portion 143 can also reduce the weight of the adapter 14 while reducing the temperature rise.

[0060] In order to reduce stress concentration on the adapter plate 14, chamfers can be set at the corners where the auxiliary connection part 143 is away from the pole connection part 141 and the tab connection part 142, at the connection between the auxiliary connection part 143 and the pole connection part 141, and at the connection between the auxiliary connection part 143 and the tab connection part 142.

[0061] In some optional embodiments, the auxiliary connection portion 143 has an arc edge 1431 on a side away from the pole connection portion 141 and the tab connection portion 142 .

[0062] The arc edge 1431 facilitates machining and reduces the weight of the adapter 14 while lowering the temperature rise of the auxiliary connection portion 143. The curvature of the arc edge 1431 is related to the side distance D between the pole connection portion and the tab connection portion, and is also related to the length F of the pole connection portion.

[0063] like Figure 7 As shown, the arc edge 1431 can extend from the outer side of the tab connection portion 142 to the middle of the edge of the pole connection portion 141; Figure 8 As shown, the arc edge 1431 may also extend from the outer side of the tab connection portion 142 to the outer side of the pole connection portion 141 .

[0064] It should be noted that the design of the arc edge 1431 can be adjusted according to the size ratio between the pole connection part 141 and the tab connection part 142 on the adapter 14, and can also be one or more arc connections, which is not limited here.

[0065] In some optional embodiments, the first direction A and the second direction B are perpendicular to each other, thereby further improving the material utilization rate during the processing of the adapter plate 14 and making the welding of the pole 12 and the tab 131 more flexible.

[0066] In some optional embodiments, please refer to Figure 4 The auxiliary connection portion 143 has a through hole 1432 , and the through hole 1432 is located close to the edge where the auxiliary connection portion 143 is connected to the pole connection portion 141 , and the edge where the auxiliary connection portion 143 is connected to the tab connection portion 142 .

[0067] The provision of the through hole 1432 can reduce the weight of the adapter plate 14 . At the same time, the provision position of the through hole 1432 ensures that the through hole 1432 does not affect the cooling effect of the auxiliary connecting portion 143 .

[0068] In some optional embodiments, the shape of the through hole 1432 is circular or triangular. The through hole 1432 of the above shape can reduce the weight of the adapter plate 14 and facilitate processing. It should be noted that the embodiment of the present application is only an example, and the shape of the through hole 1432 can also be other shapes, which are not limited here.

[0069] In some optional embodiments, please refer to Figure 2 and Figure 3 There are two poles 12, which are respectively a positive pole and a negative pole; there are two adapters 14, which are respectively connected to the positive pole and the negative pole; there are at least two bare cells 13, and each bare cell 13 has a positive tab and a negative tab. It can be understood that Figure 3 Of the two poles 12 marked in FIG, one is a positive pole and the other is a negative pole. Figure 2 and Figure 3 In the figure, of the two tabs 131 marked on a bare cell 13, one is a positive tab and the other is a negative tab.

[0070] Please refer to Figure 4 , the tab connection portion 142 on each adapter plate 14 includes two tab sub-connections 1421. Along the second direction B, the two tab sub-connections 1421 are connected to each other; the two tab sub-connections 1421 on each adapter plate 14 are correspondingly connected to the tabs 131 with the same polarity. That is, the two tab sub-connections 1421 of the adapter plate 14 connected to the positive pole are both correspondingly connected to the positive tab, and the two tab sub-connections 1421 of the adapter plate 14 connected to the negative pole are both correspondingly connected to the negative tab. Along the first direction A, the pole connection portion 141 is respectively connected to the two tab sub-connections 1421. In this way, electrical connection between the tabs 131 on at least two bare cells 13 and the pole 12 can be achieved.

[0071] In some optional embodiments, the two tab sub-connecting portions 1421 are symmetrically arranged, so that the space on the adapter plate 14 can be divided more reasonably. Figure 4 As shown, one side of the center line is a pole lug sub-connection portion 1421 , and the other side is another pole lug sub-connection portion 1421 .

[0072] In some optional embodiments, the tab connection portion 142 is provided with a positioning structure 144, which is used to position the adapter plate 14 during welding, so as to achieve rapid positioning of the adapter plate 14 during welding and ensure the accuracy of the position of the adapter plate 14.

[0073] In some optional embodiments, the positioning structure 144 is a positioning hole, which is provided at the edge of the tab connection portion 142 away from the pole connection portion 141. The positioning hole is in an arc or triangular shape to facilitate the processing of the positioning hole and to achieve the positioning of the adapter 14. The positioning hole is provided between the two tab sub-connecting portions 1421, and can simultaneously achieve the positioning of the two tab sub-connecting portions 1421.

[0074] In some optional embodiments, the adapter plate 14 further includes an anti-fool structure 145 , which is disposed at one end of the pole connection portion 141 away from the tab connection portion 142 , and is used to distinguish the positive adapter plate 14 from the negative adapter plate 14 .

[0075] The foolproof structure 145 can quickly distinguish whether the adapter plate 14 is a positive adapter plate or a negative adapter plate, thereby improving welding efficiency.

[0076] In some optional embodiments, the fool-proof structure 145 is a notch provided on the edge of the pole connecting portion 141 away from the tab connecting portion 142. The notch-shaped fool-proof structure 145 is easy to process.

[0077] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A secondary battery comprising: A top cover, wherein the top cover is provided with a pole; a bare cell, wherein the bare cell has a tab; wherein the secondary battery further comprises: The adapter plate has: A pole connection portion, a tab connection portion, and an auxiliary connection portion; the pole connection portion is used to connect to the pole; the tab connection portion is used to connect to the tab; Along the first direction, the pole connecting portion is connected to the tab connecting portion; Along the second direction, the width of the tab connection portion is greater than the width of the pole connection portion; the first direction and the second direction are not parallel; Along the second direction, the auxiliary connection portion is provided on one side of the pole connection portion; One end of the auxiliary connection portion is connected to the pole connection portion, and the other end is connected to the tab connection portion; the auxiliary connection portion is used to reduce the temperature rise of the adapter.

2. The secondary battery according to claim 1, wherein Along the second direction, the width of the auxiliary connection portion is less than or equal to the side distance between the pole connection portion and the tab connection portion.

3. The secondary battery according to claim 1, wherein The auxiliary connection portion is in a rectangular, triangular or curved shape.

4. The secondary battery according to claim 3, wherein The auxiliary connection portion has an arc edge on a side away from the pole connection portion and the tab connection portion.

5. The secondary battery according to any one of claims 1 to 4, wherein The auxiliary connection portion has a through hole, and the through hole is located close to an edge where the auxiliary connection portion is connected to the pole connection portion, and an edge where the auxiliary connection portion is connected to the tab connection portion.

6. The secondary battery according to claim 5, wherein The through hole is in a circular or triangular shape.

7. The secondary battery according to any one of claims 1 to 4, wherein There are two poles, and the two poles are respectively a positive pole and a negative pole; There are two adapter plates, and the two adapter plates are connected to the positive electrode column and the negative electrode column respectively; There are at least two bare cells, and each of the bare cells has a positive electrode tab and a negative electrode tab; The tab connection portion on each adapter plate includes two tab sub-connecting portions, and along the second direction, the two tab sub-connecting portions are connected to each other; the two tab sub-connecting portions on each adapter plate are correspondingly connected to the tabs with the same polarity; Along the first direction, the pole connecting portion is connected to the two pole lug sub-connecting portions respectively.

8. The secondary battery according to any one of claims 1 to 4, wherein The first direction and the second direction are perpendicular to each other.

9. The secondary battery according to claim 7, wherein The tab connection portion is provided with a positioning structure, and the positioning structure is used to position the adapter during welding.

10. The secondary battery according to claim 9, wherein The positioning structure is a positioning hole, and is arranged at an edge of the tab connection portion away from the pole connection portion; the positioning hole is arc-shaped or triangular; and the positioning hole is arranged between the two tab sub-connections.

11. The secondary battery according to claim 1, wherein The adapter plate further includes an anti-fool structure, which is provided at one end of the pole connecting portion away from the tab connecting portion, and is used to distinguish the positive electrode adapter plate from the negative electrode adapter plate.

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