Battery and electric device

Abstract

The utility model relates to battery packaging technical field discloses a kind of battery and electric device, shorten the packaging length of electric core, improve battery capacity.Battery includes first electric core, second electric core and circuit board;First electric core includes the first end portion of first packaging edge and first tab;Second electric core includes the second end portion of second tab;First electric core and second electric core are located at the width direction of circuit board two sides respectively, and first end portion is opposite with second end portion;First tab and second tab are respectively connected in the thickness direction of circuit board two sides;Wherein, first tab includes the first connecting section outside first packaging edge and first transition section;First connecting section is connected with circuit board, and the first end of first transition section is connected with first connecting section;Second end of first transition section is bent to the side of first connecting section away from circuit board, and is connected with first packaging edge;Along the thickness direction of circuit board, the projection of first packaging edge and first connecting section at least partially overlaps.

Description

Technical Field

[0001] This utility model relates to the field of battery packaging technology, specifically to a battery and an electrical device. Background Technology

[0002] As electronic devices continue to evolve towards miniaturization and high performance, higher demands are being placed on battery energy density and packaging size. In the battery manufacturing field, dual-cell batteries are widely used due to their advantages, such as increased battery capacity under certain conditions. However, a significant industry bottleneck exists in the current process of welding dual-cell batteries to PCB boards. Specifically, to ensure welding stability and reliability, the cell tabs and PCB board pads are typically clamped together using clamping jaws and support blocks before welding. Therefore, sufficient space must be reserved between the tabs and pads for the clamping jaws and support blocks to ensure welding quality. However, their presence inevitably leads to a significant increase in the length of the dual-cell packaging size. This increased packaging size directly restricts the battery's layout and installation within a limited space, making it difficult to further optimize space utilization and thus hindering the effective improvement of battery energy density, making it difficult to meet the demands of electronic devices for higher energy density batteries. Utility Model Content

[0003] In view of this, the present invention provides a battery and power device to solve the problem that the package size is too large in the length direction due to the reserved space for the pressure claws and support blocks during the welding of dual-cell batteries onto the circuit board.

[0004] In a first aspect, the present invention provides a battery, including a first battery cell, a second battery cell, and a circuit board; the first battery cell includes a first end, the first end having a first encapsulation edge and a first tab; the second battery cell includes a second end, the second end having a second tab; the first battery cell and the second battery cell are respectively located on both sides of the circuit board in the width direction, and the first end and the second end are opposite to each other; the first tab and the second tab are respectively connected to both sides of the circuit board in the thickness direction; wherein, the first tab includes a first connecting segment and a first transition segment located outside the first encapsulation edge; the first connecting segment is connected to the circuit board, and the first end of the first transition segment is connected to the first connecting segment; the second end of the first transition segment is bent to the side of the first connecting segment away from the circuit board and connected to the first encapsulation edge; along the thickness direction of the circuit board, the projections of the first encapsulation edge and the first connecting segment at least partially overlap.

[0005] In one alternative implementation, along the width direction of the circuit board, the first end is connected to the end of the first connection segment near the second battery cell.

[0006] In one alternative embodiment, the first transition section includes a first straight portion, a bent portion, and a second straight portion connected in sequence; the first straight portion forms a first end, and the second straight portion forms a second end; the bent portion is arc-shaped.

[0007] In one alternative embodiment, a first insulating element is provided between the first encapsulation edge and the first connecting segment.

[0008] In one optional embodiment, the second end is provided with a second encapsulation edge, and the second tab includes a second connecting section and a second transition section located outside the second encapsulation edge; the second connecting section is connected to the circuit board, and the second transition section is connected to the second encapsulation edge.

[0009] In one optional embodiment, the circuit board includes a board body, a first connector, and a second connector; along the thickness direction of the circuit board, the first connector and the second connector are respectively connected to both sides of the board body, and their projections overlap; the first connecting segment is attached to and connected to the first connector, and the second connecting segment is attached to and connected to the second connector.

[0010] In one alternative embodiment, the battery includes two second insulating members, one of which is connected to the side of the first tab away from the circuit board and at least covers the first transition section; the other of the two second insulating members is connected to the side of the second tab away from the circuit board and at least covers the second connection section and the second transition section.

[0011] In one alternative embodiment, the battery includes two adhesive members along the thickness direction of the circuit board, one of which is connected between a first encapsulation edge and the circuit board, and the other is connected between a second encapsulation edge and the circuit board.

[0012] In one alternative embodiment, the battery includes two buffers, one of which is connected between a first end and a circuit board, and the other is connected between a second end and a circuit board.

[0013] Secondly, this utility model also provides an electrical device, including the aforementioned battery.

[0014] Using the technical solution of this utility model, the first electrode tab is provided with a first connecting section and a first transition section. The first connecting section is connected to the circuit board, and the first end of the first transition section is connected to the first connecting section. The second end is bent to the side of the first connecting section away from the circuit board and connected to the first encapsulation edge. Simultaneously, in the thickness direction of the circuit board, the projections of the first encapsulation edge and the first connecting section at least partially overlap. In traditional dual-cell structures, to reserve space for the clamping claws and support blocks, the encapsulation edges of the two cells are usually located on both sides of the connection between the electrode tab and the PCB board in the length direction of the encapsulation. However, in the technical solution of this application, by bending the first transition section, the projections of the first encapsulation edge and the first connecting section at least partially overlap in the thickness direction of the circuit board, meaning that at least a portion of the structure of the first encapsulation edge can be located on one side of the connection between the first electrode tab and the circuit board in the thickness direction of the circuit board. Compared to the traditional dual-cell structure, the battery of this application shortens the distance between the first and second cells, thereby shortening the cell encapsulation length, improving the utilization rate of cell volume, saving encapsulation space, and thus improving the battery capacity and energy density. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of a dual-cell battery in the prior art;

[0017] Figure 2 for Figure 1 A magnified view of part of I;

[0018] Figure 3 This is a cross-sectional view of a battery according to an embodiment of the present utility model;

[0019] Figure 4 for Figure 3 A magnified view of a portion of Q;

[0020] Figure 5 This is a partial cross-sectional view of a battery according to an embodiment of the present utility model;

[0021] Figures 6-13 This is a manufacturing process diagram of a battery according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100. Battery cell; 101. Electrode; 102. Encapsulation edge; 110. PCB board; 120. Solder pad; 130. Claw; 140. Support block;

[0024] 1. First battery cell; 11. First end; 111. First end face; 12. First encapsulation edge; 13. First tab; 131. First connecting section; 132. First transition section; 1321. First straight section; 1322. Bending section; 1323. Second straight section; 14. First groove; 2. Second battery cell; 21. Second end; 211. Second end face; 22. Second encapsulation edge; 23. Second tab; 231. Second connecting section; 232. Second transition section; 24. Second groove; 3. Circuit board; 31. Board body; 32. First connector; 33. Second connector; 4. First insulating component; 41. Top adhesive tape; 42. Bottom adhesive tape; 43. Side adhesive tape; 5. Second insulating component; 6. Adhesive component; 7. Buffer component; 8. Adapter component. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figure 1 and Figure 2 As shown, a traditional dual-cell battery structure typically includes two cells 100 and a PCB board 110 (Printed Circuit Board) connecting the two cells 100. The two cells 100 are located on opposite sides of the PCB board 110 in the width direction, which is also the length direction of the packaged dual-cell battery structure after packaging. Each of the two cells 100 has a package edge 102 and a tab 101 extending from the package edge 102 at one opposite end. Pads 120 are provided on both sides of the PCB board 110 in the thickness direction, and the tabs 101 of the two cells 100 are soldered to the pads 120 on both sides of the PCB board 110.

[0027] When soldering two 100-cell batteries onto a 110-cell PCB, refer to... Figure 7The tabs 101 of the two battery cells 100 and the pads 120 of the PCB board 110 must be clamped together using clamping claws 130 and support blocks 140 before welding. Under the clamping force of the support blocks 140 and clamping claws 130, the tabs 101 of the battery cells 100 and the pads 120 of the PCB board 110 are tightly overlapped and then laser welded. The width of the support block 140 must be greater than or equal to the width of the clamping claws 130. If the width of the support block 140 is too small, the tabs 101 and the pads 120 cannot be completely clamped and overlapped, resulting in gaps and incomplete welding, leading to defects such as cold solder joints and desoldering. Therefore, the pads 120 on the PCB board 110 must have space reserved outside the clamping claws 130 and support blocks 140, resulting in a larger width of the PCB board 110 and thus a larger package length for the dual-cell structure. This is currently a bottleneck in the industry.

[0028] like Figure 2 As shown, in the traditional dual-cell structure, the distance between the two cells 100 is L1. Specifically, L1 refers to the distance between the package edges 102 of the two cells 100 in the package length direction. L1 = A1 + 2B1, where A1 is the width of the PCB board 110 pad 120, that is, the size of the pad 120 in the package length direction; B1 is the process clearance.

[0029] The purpose of this utility model is to solve the problem that the package size is too large in the length direction due to the reserved space of the pressure claw 130 and the support block 140 during the welding of dual-cell circuit boards, thereby providing a battery and power device.

[0030] The following is combined Figures 3 to 13 The following describes embodiments of the present invention.

[0031] According to an embodiment of the present invention, in one aspect, a battery is provided, such as... Figure 3 and Figure 4 The battery shown includes a first cell 1, a second cell 2, and a circuit board 3. The first cell 1 includes a first end 11, which has a first encapsulation edge 12 and a first tab 13. The second cell 2 includes a second end 21, which has a second tab 23. The first cell 1 and the second cell 2 are located on opposite sides of the circuit board 3 in the width direction, with the first end 11 and the second end 21 facing each other. The first tab 13 and the second tab 23 are respectively connected to opposite sides of the circuit board 3 in the thickness direction.

[0032] It should be noted that circuit board 3 is the battery protection board, and the width direction of circuit board 3 is... Figure 3 and Figure 4 The W direction shown is the thickness direction of circuit board 3. Figure 3 and Figure 4As shown in the diagram, the W direction intersects the D direction and is preferably perpendicular to it. It can be understood that the first cell 1 and the second cell 2 are located on opposite sides of the width direction of the circuit board 3, which is typically also the length direction of the battery package. The purpose of this invention is to reduce the battery package size in the W direction.

[0033] Furthermore, such as Figure 4 As shown, the first tab 13 includes a first connecting segment 131 and a first transition segment 132 located outside the first package edge 12. The first connecting segment 131 is connected to the circuit board 3, and a first end of the first transition segment 132 is connected to the first connecting segment 131. A second end of the first transition segment 132 is bent to the side of the first connecting segment 131 away from the circuit board 3, more specifically, the second end is bent to the side of the first connecting segment 131 away from the circuit board 3 in the thickness direction of the circuit board 3, and the second end is connected to the first package edge 12. Along the thickness direction of the circuit board 3, the projections of the first package edge 12 and the first connecting segment 131 at least partially overlap.

[0034] Further, the first battery cell 1 includes a first packaging shell and a first bare battery cell, with the first packaging shell covering the outside of the first bare battery cell. A first tab 13 is connected to the first bare battery cell, and a portion of the structure of the first tab 13 extends from the encapsulation edge of the first packaging shell at the first end 11 to the outside of the first packaging shell. To ensure the airtightness of the first packaging shell, tab adhesive is typically provided at the encapsulation edge of the first packaging shell at the first end 11, adhering to the first tab 13 and the encapsulation edge. In some cases, a portion of the tab adhesive is located inside the first packaging shell, and a portion is located outside the first packaging shell. In this case, the aforementioned first encapsulation edge 12 specifically refers to the encapsulation edge of the first packaging shell at the first end 11, and the portion of the tab adhesive located outside the first packaging shell.

[0035] The first connecting section 131 and the first transition section 132 of the first tab 13 are located outside the first encapsulation edge 12. Specifically, the first connecting section 131 and the first transition section 132 refer to the parts of the first tab 13 exposed outside the first packaging shell and the tab adhesive.

[0036] Combination Figure 2 and Figure 4It is evident that in the traditional dual-cell structure, to accommodate the clamping claw 130 and the support block 140, the packaging edges 102 of the two cells 100 are located on both sides of the connection between the tab 101 and the PCB board 110 in the length direction of the package. The PCB board 110 is relatively wide, and the distance between the two cells 100 is also relatively large, resulting in a longer package length. In this application, by bending the first transition section 132, the projections of the first packaging edge 12 and the first connecting section 131 at least partially overlap in the thickness direction of the circuit board 3. This means that at least a portion of the structure of the first packaging edge 12 can be located on one side of the connection between the first tab 13 and the circuit board 3. Compared to the traditional dual-cell structure, in the battery of this application, the bending of the first transition section 132 shortens the width of the circuit board 3, thereby shortening the distance between the first cell 1 and the second cell 2, resulting in a shorter package length, improved space utilization, and reduced packaging space, ultimately increasing the battery capacity and energy density.

[0037] In some embodiments, along the width direction of the circuit board 3, the first end is connected to the end of the first connecting segment 131 near the second battery cell 2. Thus, during manufacturing, the second tab 23 of the second battery cell 2 can be connected to the circuit board 3 first, then the first battery cell 1 and the second battery cell 2 can be stacked, and the first tab 13 of the first battery cell 1 can be connected to the circuit board 3 on the same side of the width direction of the circuit board 3. After both the first battery cell 1 and the second battery cell 2 are connected to the circuit board 3, the first battery cell 1 is flipped so that the first battery cell 1 and the second battery cell 2 are located on opposite sides of the width direction of the circuit board 3. At this time, the first transition segment 132 of the first tab 13 is bent. In the width direction of the circuit board 3, i.e., the W direction, the first end of the first transition segment 132 is connected to the end of the first connecting segment 131 near the second battery cell 2; in the thickness direction of the circuit board 3, i.e., the D direction, the second end of the first transition segment 132 is located on the side of the first connecting segment 131 away from the circuit board 3. The battery in this embodiment utilizes the flipping of the first cell 1 to achieve the bending of the first transition section 132. The manufacturing process is simple, easy to process and manufacture, and has low production costs.

[0038] Further, in some embodiments, the first transition section 132 includes a first straight portion 1321, a bent portion 1322, and a second straight portion 1323 connected in sequence. The first straight portion 1321 forms the aforementioned first end, the second straight portion 1323 forms the aforementioned second end, and the bent portion 1322 is arc-shaped, that is, the bent portion 1322 is an arc with a subtended central angle greater than 180°. In this embodiment, the first straight portion 1321 is connected to the first connecting section 131, the second straight section is connected to the first encapsulation edge 12, specifically to the tab adhesive of the first encapsulation edge 12, and the arc-shaped bent portion 1322 is located between the first straight portion 1321 and the second straight portion 1323. With this design, when the battery is subjected to external forces such as vibration or impact, the bending part 1322 can act as a buffer, effectively preventing the first tab 13 from loosening or falling off from the circuit board 3 or the first encapsulation edge 12, ensuring the electrical connection stability of the battery, and improving the battery's reliability and service life.

[0039] Of course, in some embodiments shown in the figures, along the width direction of the circuit board 3, the first end may also be connected to the end of the first connecting section 131 near the first battery cell 1. In this case, the first transition section 132 may also include a first straight portion 1321, a bent portion 1322, and a second straight portion 1323, with the first straight portion 1321 forming the first end, the second straight portion 1323 forming the second end, and the bent portion 1322 being "S" shaped.

[0040] Furthermore, in some embodiments, a first insulating element 4 is provided between the first encapsulation edge 12 and the first connecting segment 131 to avoid short circuits and ensure the reliability of battery applications. Specifically, such as Figure 6 As shown, the first packaging shell of the first battery cell 1 forms the aforementioned packaging edge at the first end 11. A top adhesive tape 41, which is insulating, can be provided on this packaging edge. The top adhesive tape 41 can be used to form a first insulating element 4 between the first packaging edge 12 and the first connecting segment 131. Alternatively, insulating tape can be pasted on the first packaging edge 12 after the first battery cell 1 is connected to the circuit board 3 and before it is flipped, so that the aforementioned first insulating element 4 is formed after flipping.

[0041] Furthermore, the outer casing of the first battery cell 1 may also be provided with bottom adhesive tape 42 and side adhesive tape 43. The bottom adhesive tape 42 is bonded to the end of the first casing opposite to the first end 11, and the side adhesive tape 43 is bonded to the two sides of the first casing adjacent to the first end 11. Both the bottom adhesive tape 42 and the side adhesive tape 43 are insulating. The bottom adhesive tape 42 is used to insulate the angle formed by the first casing at the end away from the first end 11, and the side adhesive tape 43 is used to insulate the two sides of the first casing adjacent to the first end 11, so as to prevent the first casing from contacting the metal battery compartment of the electrical device and corroding the first battery cell 1.

[0042] Furthermore, in some embodiments, the second end 21 is provided with a second encapsulation edge 22, and the second tab 23 includes a second connecting section 231 and a second transition section 232 located outside the second encapsulation edge 22. The second connecting section 231 is connected to the circuit board 3, and the second transition section 232 is connected to the second encapsulation edge 22. When the first battery cell 1 is connected to the circuit board 3, the first transition section 132 provides a process clearance for the connection between the first connecting section 131 and the circuit board 3, ensuring a good connection. When the second battery cell 2 is connected to the circuit board 3, the second transition section 232 provides a process clearance for the connection between the second connecting section 231 and the circuit board 3, ensuring a good connection.

[0043] For example, such as Figure 4 As shown, the second transition segment 232 can extend in the width direction of the circuit board 3. The second transition segment 232 can extend straight or curved. Alternatively, in some embodiments not shown in the figure, the second transition segment 232 can also adopt a structure similar to the first transition segment 132 described above, which will not be described again here.

[0044] Furthermore, the construction of the second battery cell 2 is similar to that of the first battery cell 1. The second battery cell 2 includes a second packaging shell and a second bare battery cell, with the second packaging shell covering the outside of the second bare battery cell. A second tab 23 is connected to the second bare battery cell, and a portion of the structure of the second tab 23 extends from the encapsulation edge of the second packaging shell at the second end 21 to the outside of the second packaging shell. To ensure the airtightness of the second packaging shell, tab adhesive is usually also provided at the encapsulation edge of the second packaging shell at the second end 21, and the tab adhesive is bonded between the second tab 23 and the encapsulation edge of the second packaging shell. In some cases, part of the tab adhesive structure is located inside the second packaging shell, and part of the structure is located outside the second packaging shell. In this case, the aforementioned second encapsulation edge 22 specifically refers to the aforementioned encapsulation edge of the second packaging shell at the second end 21, and the structure of the tab adhesive located outside the second packaging shell.

[0045] The second connecting section 231 and the second transition section 232 of the second tab 23 are located outside the second packaging edge 22. Specifically, the second connecting section 231 and the second transition section 232 refer to the parts of the second tab 23 exposed outside the second packaging shell and the tab adhesive.

[0046] Furthermore, such as Figure 6As shown, the second packaging shell of the second battery cell 2 may also be provided with the aforementioned top adhesive tape 41, bottom adhesive tape 42, and side adhesive tape 43. The top adhesive tape 41 is bonded to the encapsulation edge formed at the second end 21 of the second packaging shell, the bottom adhesive tape 42 is bonded to the end of the second packaging shell opposite to the second end 21, and the side adhesive tape 43 is bonded to the two sides of the second packaging shell adjacent to the second end 21. The top adhesive tape 41 is used to insulate the encapsulation edge formed at the second end 21 of the second packaging shell, the bottom adhesive tape 42 is used to insulate the angle formed at the end of the second packaging shell away from the second end 21, and the side adhesive tape 43 is used to insulate the two sides of the second packaging shell adjacent to the second end 21, to prevent the second packaging shell from contacting the metal battery compartment of the electrical device and corroding the second battery cell 2.

[0047] Furthermore, in some embodiments, such as Figure 3 As shown, the circuit board 3 includes a board body 31, a first connector 32, and a second connector 33. Along the thickness direction of the circuit board 3, the first connector 32 and the second connector 33 are respectively connected to both sides of the board body 31, and their projections overlap. The first connecting segment 131 is attached to and connected to the first connector 32, and the second connecting segment 231 is attached to and connected to the second connector 33. With this arrangement, along the thickness direction of the circuit board 3, the projections of the first connecting segment 131 and the second connecting segment 231 also overlap, thereby minimizing the distance between the first battery cell 1 and the second battery cell 2, thus minimizing the battery's package length and increasing the capacity and energy density of the battery cell 100.

[0048] Understandably, the first connector 32 and the second connector 33 are used to form the pads of the first tab 13 and the second tab 23 on the circuit board 3, respectively. Exemplarily, both the first connector 32 and the second connector 33 can be in the shape of a block, plate, or disc, and both can be made of nickel or a nickel alloy.

[0049] Furthermore, the first connecting segment 131 and the first connecting member 32 can be welded, and the second connecting segment 231 and the second connecting member 33 can also be welded, such as by laser welding. Of course, other welding methods can also be used, or conductive adhesive bonding can be used, but welding is preferred.

[0050] Furthermore, such as Figure 6As shown, taking the first battery cell 1 as an example, the first battery cell 1 has two first tabs 13, namely a first positive tab and a first negative tab. The first positive tab includes a tab portion and an adapter 8, wherein the tab portion is connected to the first bare battery cell of the first battery cell 1, and part of the structure of the tab portion is located outside the first packaging shell. The adapter 8 is connected to the end of the tab portion away from the first bare battery cell, that is, the end of the tab portion located outside the first packaging shell. The adapter 8 forms the aforementioned first connecting section 131, and the structure of the tab portion located between the adapter 8 and the first encapsulation edge 12 forms the aforementioned first transition section 132. The first negative tab does not need to be provided with the aforementioned adapter 8. For example, the material of the adapter 8 can be metallic nickel or a nickel alloy.

[0051] Furthermore, such as Figure 4 As shown, the first end 11 of the first battery cell 1 has a first end face 111 facing the second battery cell 2, and the first encapsulation edge 12 and the first end face 111 together form a first groove 14. The aforementioned adapter 8 is connected to the side of the first positive electrode near the first groove 14. When the first battery cell 1 is connected to the circuit board 3, part of the structure of the circuit board 3 is located in the first groove 14. The material of the first positive electrode is usually aluminum, and the material of the first connector 32 is metallic nickel or a nickel alloy. When aluminum is connected to a nickel-containing material, due to the thermal conductivity of the material, the nickel-containing material is required to be soldered on top. Therefore, the tab of the first positive electrode cannot be directly soldered to the first connector 32. The adapter 8 is provided to realize the soldering of the tab of the first positive electrode to the first connector 32.

[0052] Similarly, the second electrode 23 of the second battery cell 2 includes a second positive electrode and a second negative electrode, and the first positive electrode also includes the aforementioned adapter 8, which is arranged similarly to that of the first battery cell 1, and will not be described again here. Among them, such as Figure 4 As shown, the second end 21 of the second battery cell 2 has a second end face 211 facing the first battery cell 1, and the second encapsulation edge 22 and the second end face 211 together form a second groove 24. In the width direction of the circuit board 3, the first groove 14 and the second groove 24 are opposite to each other and form a mounting space, and the circuit board 3 is located in the mounting space.

[0053] Furthermore, in some embodiments, such as Figure 12 and Figure 13As shown, the battery includes two second insulating members 5. One of the two second insulating members 5 is connected to the side of the first tab 13 away from the circuit board 3 and at least covers the first transition section 132. The other of the two second insulating members 5 is connected to the side of the second tab 23 away from the circuit board 3 and at least covers the second connecting section 231 and the second transition section 232. In this embodiment, two second insulating members 5 are provided to cover the first tab 13 and the second tab 23 to prevent the first tab 13 and the second tab 23 from contacting the metal battery compartment of the electrical device and causing a short circuit. Exemplarily, the second insulating members 5 can be made of insulating tape, semi-solid insulating adhesive, liquid insulating adhesive, etc.

[0054] Furthermore, in some embodiments, such as Figure 6 As shown, the battery includes two adhesive members 6 along the thickness direction of the circuit board 3. One of the two adhesive members 6 is connected between the first encapsulation edge 12 and the circuit board 3 to bond and fix the first battery cell 1 to the circuit board 3, ensuring the reliability of the battery. Specifically, one of the two adhesive members 6 is bonded to the side of the first encapsulation edge 12 near the first groove 14. The other of the two adhesive members 6 is connected between the second encapsulation edge 22 and the circuit board 3 to bond and fix the second battery cell 2 to the circuit board 3, ensuring the reliability of the battery. Specifically, the other of the two adhesive members 6 is bonded to the side of the second encapsulation edge 22 near the second groove 24. Exemplarily, the adhesive member 6 can be double-sided tape, semi-solid adhesive, liquid adhesive, etc.

[0055] In some embodiments, such as Figure 4 As shown, the battery also includes two buffers 7. One of the buffers 7 is connected between the first end 11 and the circuit board 3. Specifically, one of the buffers 7 is located within the first groove 14 and connected between the first end face 111 and the circuit board 3. The other buffer 7 is connected between the second end 21 and the circuit board 3. Specifically, the other buffer 7 is located within the second groove 24 and connected between the second end face 211 and the circuit board 3. For example, the buffer 7 can be a silicone pad. By providing buffers 7 between the first end 11 and the circuit board 3, and between the second end 21 and the circuit board 3, the impact between the circuit board 3 and the battery cell during a drop is buffered, thereby improving the battery's lifespan and reliability.

[0056] like Figure 5 As shown, in the battery of this utility model, the distance between the first cell 1 and the second cell 2 is L2. Specifically, L2 refers to the distance between the first encapsulation edge 12 of the first cell 1 and the second encapsulation edge 22 of the second cell 2 in the encapsulation length direction, i.e., the W direction. Figure 5As shown, L2+F=H+G+A2+B2, or L2=H+G+A2+B2-F, where A2 is the width of the first connector 32 or the second connector 33 of the circuit board 3, and its value is equal to that of A1 above; B2 is the clearance for process design, and its value is equal to that of B1 above, usually around 0.5mm; H is the thickness of the buffer 7, which is usually designed to be ≥0.4mm; G is the distance between the first connector 32 or the second connector 33 and the edge of the circuit board 3, which is limited by the SMT (Surface Mount Technology) mounting level, and the industry generally requires ≥0.5mm; F ​​is the size of the first package edge 12, which depends on the cell design and is usually >2mm.

[0057] Compared to the traditional dual-cell structure, the battery of this invention reduces the package length by L1-L2 = B1 + FHG. Taking B1 as 0.5mm, F as 5.2mm, H as 0.4mm, and G as 0.5mm as an example, the package length of the battery of this invention is reduced by 4.8mm. Clearly, compared to the traditional dual-cell structure, the battery of this invention significantly reduces the package length, increases the utilization rate of cell volume, and improves battery capacity and energy density.

[0058] The following is combined Figures 6-13 The manufacturing process of the battery of this utility model is described below:

[0059] S1: Processing the first battery cell 1 and the second battery cell 2: Specifically, as follows... Figure 6 As shown, the top adhesive tape 41, side adhesive tape 43, bottom adhesive tape 42, adapter 8, adhesive 6, and buffer 7 are respectively arranged on the first battery cell 1 and the second battery cell 2.

[0060] S2: Solder the second battery cell 2 to the circuit board 3: Specifically, as follows Figure 7 As shown, after the support block 140 and the pressure claw 130 press the first connector 32 and the first connecting segment 131 together, laser welding technology is used to weld the first connector 32 to the first connector 32.

[0061] S3: Stack the first battery cell 1 onto the second battery cell 2, and solder the first battery cell 1 to the circuit board 3: Specifically, as follows... Figure 8 and Figure 9 As shown, the second battery cell 2 after step S2 is flipped over, and the first battery cell 1 is placed on top of the second battery cell 2. After the second connector 33 and the second connecting segment 231 are pressed together using the support block 140 and the clamping claw 130, the second connector 33 is welded to the first connector 231 using laser welding technology. Understandably, in this step, the support block 140 is located below the second connecting segment 231, and the clamping claw 130 is located above the first connecting segment 131.

[0062] S4: Folding the first cell 1: Specifically, as follows Figure 10 and Figure 11 As shown, the first battery cell 1 is flipped around the flipping center R, so that the first battery cell 1 and the second battery cell 2 are located on opposite sides of the width direction of the circuit board 3. Understandably, in this step, the winding center R is located on the first transition section 132. After flipping around the flipping center R, the first transition section 132 is bent and forms the aforementioned bent portion 1322.

[0063] S5: Insulation protection: Specifically, such as Figure 12 and Figure 13 As shown, the second insulating element 5 is arranged on both sides of the battery.

[0064] According to an embodiment of the present invention, another aspect provides an electrical device including the aforementioned battery. The electrical device has a battery compartment in which the battery is installed. The electrical device of the present invention integrates the aforementioned innovative battery structure, shortening the distance between the first cell 1 and the second cell 2, thereby shortening the cell packaging length, increasing the battery capacity and energy density, and significantly improving the overall performance and reliability of the electrical device.

[0065] This power supply device can be widely used in portable electronic devices (such as smart wearable devices and drones), power tools (such as electric screwdrivers and vacuum cleaners), and energy storage systems (such as home energy storage and industrial backup power supplies) to meet the needs for high energy density and high safety in different scenarios.

[0066] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, The circuit includes a first battery cell (1), a second battery cell (2), and a circuit board (3); the first battery cell (1) includes a first end (11), which has a first encapsulation edge (12) and a first tab (13); the second battery cell (2) includes a second end (21), which has a second tab (23); the first battery cell (1) and the second battery cell (2) are located on opposite sides of the width direction of the circuit board (3), and the first end (11) and the second end (21) are opposite to each other; the first tab (13) and the second tab (23) are connected to opposite sides of the thickness direction of the circuit board (3); The first tab (13) includes a first connecting segment (131) and a first transition segment (132) located outside the first encapsulation edge (12); the first connecting segment (131) is connected to the circuit board (3), and the first end of the first transition segment (132) is connected to the first connecting segment (131); the second end of the first transition segment (132) is bent to the side of the first connecting segment (131) away from the circuit board (3) and connected to the first encapsulation edge (12); along the thickness direction of the circuit board (3), the projections of the first encapsulation edge (12) and the first connecting segment (131) at least partially overlap.

2. The battery according to claim 1, characterized in that, Along the width direction of the circuit board (3), the first end is connected to the end of the first connecting segment (131) near the second battery cell (2).

3. The battery according to claim 2, characterized in that, The first transition section (132) includes a first straight section (1321), a bent section (1322), and a second straight section (1323) connected in sequence; the first straight section (1321) forms the first end, and the second straight section (1323) forms the second end; the bent section (1322) is arc-shaped.

4. The battery according to claim 1, characterized in that, A first insulating element (4) is provided between the first encapsulation edge (12) and the first connecting segment (131).

5. The battery according to claim 1, characterized in that, The second end (21) is provided with a second encapsulation edge (22), and the second tab (23) includes a second connecting section (231) and a second transition section (232) located outside the second encapsulation edge (22); the second connecting section (231) is connected to the circuit board (3), and the second transition section (232) is connected to the second encapsulation edge (22).

6. The battery according to claim 5, characterized in that, The circuit board (3) includes a board body (31), a first connector (32) and a second connector (33); along the thickness direction of the circuit board (3), the first connector (32) and the second connector (33) are respectively connected to both sides of the board body (31) and their projections overlap; the first connecting segment (131) is attached to and connected to the first connector (32), and the second connecting segment (231) is attached to and connected to the second connector (33).

7. The battery according to claim 5, characterized in that, The battery includes two second insulating members (5), one of which is connected to the side of the first tab (13) away from the circuit board (3) and at least covers the first transition section (132); the other of the two second insulating members (5) is connected to the side of the second tab (23) away from the circuit board (3) and at least covers the second connection section (231) and the second transition section (232).

8. The battery according to claim 5, characterized in that, The battery includes two adhesive members (6) along the thickness direction of the circuit board (3). One of the two adhesive members (6) is connected between the first encapsulation edge (12) and the circuit board (3), and the other is connected between the second encapsulation edge (22) and the circuit board (3).

9. The battery according to any one of claims 1-8, characterized in that, The battery includes two buffers (7), one of which is connected between the first end (11) and the circuit board (3), and the other is connected between the second end (21) and the circuit board (3).

10. An electrical device, characterized in that, The battery includes any one of claims 1 to 9.

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