Connecting sheet, circuit board and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a connecting piece, a circuit board and a battery. The connecting piece comprises a tab welding part, a connecting part and a plate welding part. The tab welding part comprises a first welding section, a bending section and a second welding section which are connected in sequence, the second welding section is connected with the plate welding part through a connecting part, the first welding section and the second welding section are folded through the bending section so that the tab can be clamped between the first welding section and the second welding section, and the second welding section is located on one side in the width direction of the circuit board; the board welding part is used for being welded to one side of the circuit board in the thickness direction. According to the connecting piece provided by the utility model, the size of the connecting piece in the height direction can be reduced as much as possible under the condition that the connecting strength is ensured, so that a space is provided for a larger battery cell to enlarge the capacity density of the battery, the ultimate miniaturization of the battery can be realized, and the application range of the battery is expanded.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a connecting piece, a circuit board and a battery. Background Art

[0002] Polymer battery, also known as polymer lithium battery, is a chemical battery with the characteristics of high energy, miniaturization and light weight. At present, the circuit board in the polymer battery is generally installed on the top of the battery cell, and the battery cell is connected to the circuit board through the connection structure of the pole ear and the connecting piece to realize various battery functions. However, the circuit board in the current polymer battery is connected to the bottom of the circuit board through a conventional connecting piece and then electrically connected to the pole ear of the battery cell, resulting in the connecting piece occupying a certain size in the height direction, which is not conducive to realizing the ultimate miniaturization of the battery, resulting in a smaller application range of the battery. Utility Model Content

[0003] The utility model aims to provide a connecting piece, a circuit board and a battery, which can reduce the size of the battery in the height direction as much as possible while ensuring the connection strength, realize the ultimate miniaturization of the battery, and expand the application range of the battery.

[0004] The utility model provides a connecting piece for installation on a circuit board, the connecting piece comprising a pole ear welding portion, a connecting portion and a plate welding portion, the pole ear welding portion comprising a first welding section, a bending section and a second welding section connected in sequence, the second welding section is connected to the plate welding portion through the connecting portion, the first welding section and the second welding section are folded in half through the bending section to clamp the pole ear between the first welding section and the second welding section, the second welding section is located on one side in the width direction of the circuit board, and the plate welding portion is used to be welded to one side in the thickness direction of the circuit board.

[0005] Furthermore, the size of the first welding section in the thickness direction of the circuit board and the size of the second welding section in the thickness direction of the circuit board satisfy the following relationship: L1

[0006] In the formula, L1 is the size of the first welding section in the thickness direction of the circuit board, L2 is the size of the second welding section in the thickness direction of the circuit board, H1 is the thickness of the circuit board, and H2 is the height of the components connected to the circuit board.

[0007] Further, a dimension of the first welding section in a thickness direction of the circuit board is smaller than a dimension of the second welding section in the thickness direction of the circuit board.

[0008] ​Further, a dimension of the first welding section in the thickness direction of the circuit board ranges from 0.8 mm to 1.4 mm; and / or a dimension of the second welding section in the thickness direction of the circuit board ranges from 1 mm to 1.6 mm.

[0009] Furthermore, the first welding section is welded to the pole tab to form a plurality of first welding spots, and the plurality of first welding spots are arranged side by side; the second welding section is welded to the pole tab to form a plurality of second welding spots, and the plurality of second welding spots are arranged side by side.

[0010] Further, each of the first welding spots corresponds to each of the second welding spots one by one; and / or, the diameters of the first welding spots and the second welding spots are equal, and the diameter range is 0.3 mm to 0.5 mm.

[0011] Further, a first stress groove is provided at an end of the bending section in the width direction; and / or a second stress groove is provided at an end of the connecting portion in the width direction.

[0012] Furthermore, the thickness of the connecting sheet ranges from 0.08 mm to 0.12 mm.

[0013] The utility model also provides a circuit board, comprising the above-mentioned connecting piece, wherein the second welding section of the connecting piece is located at one side in the width direction of the circuit board, and the board welding portion is welded to one side in the thickness direction of the circuit board.

[0014] The utility model also provides a polymer battery, comprising the above-mentioned circuit board, the battery comprising a battery cell, and the pole ear of the battery cell is connected to the circuit board.

[0015] The connecting piece, circuit board and battery provided by the utility model have the following beneficial effects:

[0016] The connecting piece provided by the utility model, the pole ear welding part includes a first welding section, a bending section and a second welding section connected in sequence, the second welding section is connected to the plate welding part through the connecting part, the first welding section and the second welding section are folded in half through the bending section to clamp the pole ear between the first welding section and the second welding section, the second welding section is located on one side in the width direction of the circuit board, and the plate welding part is used to weld with one side in the thickness direction of the circuit board. Compared with the prior art, the connecting piece provided by the utility model adopts the first welding section and the second welding section that are folded in half through the bending section and are both used for welding with the pole ear, and the first welding section and the second welding section are both located on the side of the circuit board, while the plate welding part is directly connected to one side of the circuit board. Therefore, the connecting piece provided by the utility model is applied to the circuit board and the battery, and the size occupied by the connecting piece in the height direction can be minimized while ensuring the connection strength between the connecting piece and the circuit board, thereby providing more space for larger batteries to expand the capacity density of the battery, and can also achieve the ultimate miniaturization of the battery and expand the application range of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure in which the connecting piece provided in the embodiment of the utility model is connected between the pole ear and the circuit board;

[0019] Figure 2 A schematic structural diagram of a connecting piece provided by an embodiment of the utility model after unfolding from one viewing angle;

[0020] Figure 3 A schematic structural diagram of another viewing angle of the connecting piece provided by an embodiment of the utility model after it is unfolded;

[0021] Figure 4 A schematic diagram of the structure of the connecting sheet after folding provided in an embodiment of the utility model.

[0022] Reference numerals:

[0023] 100-connecting piece; 110-ear welding part; 111-first welding section; 112-bending section; 113-second welding section; 120-connecting part; 130-board welding part; 140-first welding point; 150-second welding point; 160-first stress groove; 170-second stress groove; 200-battery cell; 210-ear; 300-circuit board; 400-components. DETAILED DESCRIPTION

[0024] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0025] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0026] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0030] Please refer to Figures 1 to 4 The embodiment of the utility model provides a connecting piece 100, which can minimize the size occupied by the connecting piece in the height direction while ensuring the connection strength between the connecting piece and the circuit board, thereby providing more space for larger battery cells to expand the capacity density of the battery, and can also achieve extreme miniaturization of the battery and expand the application range of the battery.

[0031] The connecting sheet 100 includes a tab welding portion 110, a connecting portion 120 and a plate welding portion 130. The tab welding portion 110, the connecting portion 120 and the plate welding portion 130 are connected in sequence, wherein the tab welding portion 110 is used to weld with the tab 210 of the battery cell 200, and the plate welding portion 130 is used to weld with the circuit board 300, so as to realize the conduction between the battery cell 200 and the circuit board 300, thereby realizing various functions of the polymer battery.

[0032] In this embodiment, the connecting sheet 100 is a nickel sheet, but is not limited thereto. In other embodiments, the connecting sheet 100 may also be made of other materials, and the material of the connecting sheet 100 is not specifically limited.

[0033] It is worth noting that the tab welding portion 110 includes a first welding section 111, a bending section 112, and a second welding section 113. The first welding section 111, the bending section 112, and the second welding section 113 are connected in sequence, and the second welding section 113 is connected to the plate welding portion 130 through the connecting portion 120. The first welding section 111 and the second welding section 113 are folded in half by the bending section 112 to sandwich the tab 210 between the first welding section 111 and the second welding section 113. The tab 210 is welded to the first welding section 111 and the second welding section 113 at the same time to ensure the reliability of welding between the tab 210 and the connecting sheet 100. The plate welding portion 130 is sandwiched between the circuit board 300 and the battery cell 200, and the plate welding portion 130 is used to weld with the circuit board 300 to achieve conduction between the tab 210 and the circuit board 300.

[0034] Specifically, the second welding section 113 is located on one side of the circuit board 300 in the width direction, and the board welding portion 130 is used to weld with one side of the circuit board 300 in the thickness direction (i.e., the side of the circuit board 300 close to the battery cell or the side away from the battery cell) (the thickness direction of the circuit board 300 is the height direction of the battery cell 200). In this way, a part of the connecting piece 100 is arranged on the side of the circuit board 300, and the other part is arranged on the side of the circuit board 300 close to the battery cell or the side away from the battery cell. The present application takes the side of the circuit board 300 close to the battery cell as the main embodiment for explanation. Compared with the solution in the prior art that the connection structure of the tab 210 and the connecting piece 100 is all sandwiched between the battery cell 200 and the circuit board 300 and the connecting piece 100 is all arranged on one side of the circuit board 300 in the thickness direction, the embodiment of the utility model minimizes the volume of the connecting piece 100 between the circuit board 300 and the battery cell 200 while ensuring the connection strength, thereby reducing the size of the polymer battery in the height direction, realizing the ultimate miniaturization of the battery, and expanding the application range of the battery.

[0035] Further, the first welding section 111 is welded to the pole tab 210 to form a plurality of first welding spots 140, and the plurality of first welding spots 140 are arranged side by side to enhance the welding effect between the first welding section 111 and the pole tab 210 and improve the aesthetics. The second welding section 113 is welded to the pole tab 210 to form a plurality of second welding spots 150, and the plurality of second welding spots 150 are arranged side by side to enhance the welding effect between the second welding section 113 and the pole tab 210 and improve the aesthetics. The two rows of welding spots work together to enhance the welding effect between the pole tab 210 and the pole tab welding portion 110, and improve the connection strength and the conduction effect.

[0036] During the connection process of the pole lug welding portion 110 and the pole lug 210, the pole lug welding portion 110 and the pole lug 210 are first placed overlapping; then the pole lug welding portion 110 and the pole lug 210 are spot welded to form two rows of welding points; then the pole lug welding portion 110 and the pole lug 210 are folded at the same time, so that the first welding section 111 and the second welding section 113 are folded in half through the bending section 112, and the pole lug 210 is folded in half, at this time, the pole lug welding portion 110 is covered outside the pole lug 210, and the first welding section 111 of the pole lug welding portion 110 has a plurality of first welding points 140 arranged side by side, and the second welding section 113 of the pole lug welding portion 110 has a plurality of second welding points 150 arranged side by side.

[0037] Preferably, the position of each first welding point 140 is aligned with the position of a second welding point 150, that is, the positions of the multiple first welding points 140 arranged side by side and the multiple second welding points 150 arranged side by side correspond to each other one by one. While ensuring two rows of welding points, the folding thickness of the tab welding part 110 and the tab 210 is compressed as much as possible, thereby reducing the space occupied by the connecting piece 100 and realizing the miniaturization of the polymer battery.

[0038] In this embodiment, a plurality of first welding spots 140 are located in the middle of the first welding section 111, that is, the spot welding of the first welding section 111 and the pole tab 210 is performed in the middle of the first welding section 111, so as to further improve the welding effect of the first welding section 111 and the pole tab 210 and ensure the welding strength. Correspondingly, a plurality of second welding spots 150 are located in the middle of the second welding section 113, that is, the spot welding of the second welding section 113 and the pole tab 210 is performed in the middle of the second welding section 113, so as to further improve the welding effect of the second welding section 113 and the pole tab 210 and ensure the welding strength.

[0039] Furthermore, the diameters of the first welding spot 140 and the second welding spot 150 are equal, and the diameters are both in the range of 0.3 mm to 0.5 mm. The reasonable diameters of the first welding spot 140 and the second welding spot 150 can ensure welding strength and improve the conduction performance while facilitating welding. In this embodiment, the diameters of the first welding spot 140 and the second welding spot 150 are both 0.4 mm, but are not limited thereto. In other embodiments, the diameters of the first welding spot 140 and the second welding spot 150 can both be 0.3 mm or 0.5 mm. The diameters of the first welding spot 140 and the second welding spot 150 are not specifically limited.

[0040] It should be noted that the size of the first welding section 111 in the thickness direction of the circuit board 300 and the size of the second welding section 113 in the thickness direction of the circuit board 300 satisfy the following relationship: L1

[0041] Specifically, the size of the first welding section 111 in the thickness direction of the circuit board 300 and the size of the second welding section 113 in the thickness direction of the circuit board 300 are both smaller than the sum of the thickness of the circuit board 300 and the height of the component 400, that is, the highest point of the first welding section 111 and the second welding section 113 will not be higher than the highest point of the component 140, and will not affect the size of the entire polymer battery in the height direction, thereby achieving the ultimate miniaturization of the polymer battery.

[0042] In this embodiment, the size of the first welding section 111 in the thickness direction of the circuit board 300 is smaller than the size of the second welding section 113 in the thickness direction of the circuit board 300, so as to facilitate production and processing, and to facilitate simultaneous welding of the first welding section 111 and the second welding section 113 to the tab 210.

[0043] Further, the size of the first welding section 111 in the thickness direction of the circuit board 300 ranges from 0.8 mm to 1.4 mm, and a reasonable size of the first welding section 111 in the thickness direction of the circuit board 300 can minimize the height of the tab welding portion 110 protruding from the circuit board 300 while ensuring the welding strength. And / or, the size of the second welding section 113 in the thickness direction of the circuit board 300 ranges from 1 mm to 1.6 mm, and a reasonable size of the second welding section 113 in the thickness direction of the circuit board 300 can minimize the height of the tab welding portion 110 protruding from the circuit board 300 while ensuring the welding strength.

[0044] ​Preferably, a first stress groove 160 is provided at the end of the bending section 112. The first stress groove 160 can effectively reduce the stress concentration generated during the bending process of the bending section 112, avoid damage to the bending section 112 during the bending process, and save effort, facilitating bending and forming.

[0045] In this embodiment, the length of the first welding section 111 is equal to the length of the second welding section 113, and is greater than the length of the bending section 112. The first welding section 111, the bending section 112, and the second welding section 113 together form a first stress groove 160 to achieve the effect of reducing stress concentration. Specifically, the bending section 112 is arranged in the middle of the first welding section 111 and the second welding section 113. The number of the first stress grooves 160 is two, and the two first stress grooves 160 are relatively arranged at the two ends of the bending section 112. The two first stress grooves 160 work together to further improve the effect of reducing stress concentration and facilitate bending forming.

[0046] It is worth noting that after the welding of the pole lug welding part 110 to the pole lug 210 is completed, and the welding of the plate welding part 130 to the circuit board 300 is completed, in order to further realize the miniaturization of the polymer battery, it is necessary to bend the pole lug welding part 110 and the plate welding part 130 through the connecting part 120 so that the pole lug welding part 110 and the plate welding part 130 are vertically arranged, so that the pole lug welding part 110 is attached to the side of the circuit board 300. In this process, the connecting part 120 can achieve a smooth transition between the pole lug welding part 110 and the plate welding part 130.

[0047] Preferably, the end of the connecting portion 120 is provided with a second stress groove 170, which can effectively reduce the stress concentration generated during the bending process of the connecting portion 120, avoid the connecting portion 120 from being damaged during the bending process, and can play a labor-saving role, facilitating bending and forming. Specifically, the second stress groove 170 is arranged in an arc shape to improve the effect of reducing stress concentration and facilitate production and processing.

[0048] In this embodiment, there are two second stress grooves 170 , which are oppositely disposed at two ends of the connecting portion 120 . The two second stress grooves 170 work together to further improve the effect of reducing stress concentration and facilitate bending.

[0049] Furthermore, the thickness of the connecting sheet 100 ranges from 0.08 mm to 0.12 mm. A reasonable thickness of the connecting sheet 100 can minimize the size of the polymer battery while ensuring the conductive performance, thereby realizing miniaturization of the polymer battery. In this embodiment, the thickness of the connecting sheet 100 is 0.1 mm, that is, the thickness of the tab welding portion 110, the connecting portion 120, and the plate welding portion 130 are all 0.1 mm, but it is not limited thereto. In other embodiments, the thickness of the connecting sheet 100 can be 0.08 mm or 0.12 mm, and the thickness of the connecting sheet 100 is not specifically limited.

[0050] The connecting piece 100 provided in the embodiment of the utility model, the pole ear welding part 110 includes a first welding section 111, a bending section 112 and a second welding section 113 connected in sequence, the second welding section 113 is connected to the plate welding part 130 through the connecting part 120, the first welding section 111 and the second welding section 113 are folded in half through the bending section 112 to sandwich the pole ear 210 between the first welding section 111 and the second welding section 113, the second welding section 113 is located on one side in the width direction of the circuit board 300, and the plate welding part 130 is used to weld with one side in the thickness direction of the circuit board 300. Compared with the prior art, the connecting piece 100 provided by the utility model adopts the first welding section 111 and the second welding section 113 which are folded in half through the bending section 112 and are both used for welding with the pole ear 210, so that the size of the battery in the height direction can be minimized while ensuring the connection strength, so as to achieve the ultimate miniaturization of the battery and expand the application range of the battery.

[0051] The utility model further provides a circuit board, comprising the connecting piece 100 of any one of the above embodiments.

[0052] In this embodiment, the circuit board includes the connecting sheet 100 , so the circuit board has all the beneficial effects of the connecting sheet 100 , which will not be described in detail here.

[0053] The utility model also provides a battery, comprising the circuit board of any one of the above embodiments.

[0054] In this embodiment, the battery includes a circuit board, so the battery has all the beneficial effects of the circuit board, which will not be described in detail here.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A connecting sheet, characterized in that: Used to be installed on a circuit board, the connecting piece includes a pole ear welding portion, a connecting portion and a plate welding portion, the pole ear welding portion includes a first welding section, a bending section and a second welding section connected in sequence, the second welding section is connected to the plate welding portion through the connecting portion, the first welding section and the second welding section are folded in half through the bending section to clamp the pole ear between the first welding section and the second welding section, the second welding section is located on one side in the width direction of the circuit board, and the plate welding portion is used to be welded to one side in the thickness direction of the circuit board.

2. The connecting piece according to claim 1, characterized in that: The size of the first welding section in the thickness direction of the circuit board and the size of the second welding section in the thickness direction of the circuit board satisfy the following relationship: L1 <H1+H2;L2<H1+H2; In the formula, L1 is the size of the first welding section in the thickness direction of the circuit board, L2 is the size of the second welding section in the thickness direction of the circuit board, H1 is the thickness of the circuit board, and H2 is the height of the components connected to the circuit board.

3. The connecting piece according to claim 2, characterized in that: The dimension of the first welding section in the thickness direction of the circuit board is smaller than the dimension of the second welding section in the thickness direction of the circuit board.

4. The connecting piece according to any one of claims 1 to 3, characterized in that: The size of the first welding section in the thickness direction of the circuit board ranges from 0.8 mm to 1.4 mm; and / or the size of the second welding section in the thickness direction of the circuit board ranges from 1 mm to 1.6 mm.

5. The connecting sheet according to claim 1, characterized in that: The first welding section is welded to the pole tab to form a plurality of first welding spots, and the plurality of first welding spots are arranged side by side; the second welding section is welded to the pole tab to form a plurality of second welding spots, and the plurality of second welding spots are arranged side by side.

6. The connecting piece according to claim 5, characterized in that: Each of the first welding spots corresponds to each of the second welding spots one by one; and / or, the diameters of the first welding spots and the second welding spots are equal, and the diameter range is 0.3 mm to 0.5 mm.

7. The connecting sheet according to claim 1, characterized in that: The end of the bending section in the width direction is provided with a first stress groove; and / or the end of the connecting portion in the width direction is provided with a second stress groove.

8. The connecting sheet according to claim 1, characterized in that: The thickness of the connecting sheet ranges from 0.08 mm to 0.12 mm.

9. A circuit board, characterized in that: It comprises the connecting piece as claimed in any one of claims 1 to 8, wherein the second welding section of the connecting piece is located at one side in the width direction of the circuit board, and the board welding portion is welded to one side in the thickness direction of the circuit board.

10. A battery, characterized in that: Comprising the circuit board as claimed in claim 9, the battery comprises a battery cell, and the tabs of the battery cell are connected to the circuit board.

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