Battery assembly and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery assembly and an electric device, comprising: a battery cell, one end of which extends along a first direction to form a tab, and the battery cell is provided with a top sealing groove at the same side of the tab; the battery cell protection plate is electrically connected with the tab, the battery cell protection plate comprises a PCB, at least part of the area of the PCB extends towards one side close to the battery cell in the first direction to form a local widening part, and at least part of the local widening part is located in the top sealing groove; and the PCB is also provided with an abdicating notch part, and the projection of the tab is at least partially overlapped with the abdicating notch part along the thickness direction of the battery cell. According to the battery assembly provided by the utility model, the area of the PCB can be increased, and the heat conduction capacity is increased, so that the overall heat dissipation area of the battery core protection plate is increased, and the temperature rise of a device is reduced. On the basis of not increasing extra space occupation, the heat dissipation area of the PCB is increased.

Description

Technical Field

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

[0002] Batteries are usually equipped with a cell protection board (PCM). Taking mobile phone batteries as an example, in some high-wattage projects, if the space for the PCM board is small, the components on the PCM board may be densely packed. This will cause the temperature in the component area to rise rapidly, making the battery head extremely hot, and in some cases, it may even burn out the PCM board.

[0003] However, as mobile phone batteries become thinner and lighter, especially with foldable screen phones, the battery space design is becoming more compact. How to ensure the heat dissipation performance of the PCM board within a limited space has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention provides a battery assembly to solve the problem of how to ensure the heat dissipation performance of the PCM board as much as possible within a limited space.

[0005] In a first aspect, this utility model provides a battery assembly, comprising:

[0006] The battery cell has a tab extending from one end along a first direction, and a top sealing groove is formed on the same side of the tab.

[0007] A cell protection board, electrically connected to the electrode tab, includes: a PCB board, at least a portion of which extends along a first direction toward the side close to the cell and forms a locally widened portion, the locally widened portion being at least partially located within a top sealing groove; the PCB board also forms a clearance notch, the projection of the electrode tab along the thickness direction of the cell at least partially overlapping the clearance notch; wherein the thickness direction is perpendicular to the first direction.

[0008] Beneficial effects: By extending at least a portion of the PCB board along a first direction towards the side closest to the battery cell to form a locally widened section, and ensuring that at least a portion of the locally widened section is located within the top sealing groove, the area of ​​the PCB board can be increased, thereby increasing heat conduction and thus increasing the overall heat dissipation area of ​​the battery cell protection board, reducing device temperature rise. Simultaneously, the locally widened section increases the width of the PCB board, thereby improving the overall strength of the battery cell protection board. Since at least a portion of the locally widened section is located within the top sealing groove, the area of ​​the battery cell's top sealing groove can be utilized efficiently, increasing the heat dissipation area of ​​the PCB board without increasing additional space occupation. Furthermore, since the battery cell extends a tab on the same side as the top sealing groove, and the battery cell protection board is electrically connected to the tab, the tab adhesive at the tab location results in a thicker thickness at the corresponding position after the battery cell protection board is electrically connected to the tab. In this embodiment, the locally widened portion needs to avoid the tab location when extending into the top sealing groove, thus forming a clearance notch on the PCB board. Along the thickness direction of the battery cell, the projection of the tab and the clearance notch at least partially overlap. This avoids the tab location, ensuring that the thickness of the battery cell head is within the specification range, and the battery cell protection board can avoid the thicker area at the tab, further reducing the thickness of the battery assembly head.

[0009] In one alternative embodiment, the clearance notch and the locally widened portion are staggered along the second direction, wherein the second direction is perpendicular to both the first direction and the thickness direction of the battery cell.

[0010] Beneficial effects: By staggering the clearance notch and the local widening part, it is possible to ensure that the local widening part avoids the position of the clearance notch, thereby avoiding the position of the electrode tab, ensuring that the thickness of the cell head is within the specification range, and at the same time increasing the heat dissipation area of ​​the PCB board.

[0011] In one alternative embodiment, at least one clearance notch has a locally widened portion on both sides of its second direction.

[0012] In one alternative embodiment, at least one clearance notch is provided with a partially widened portion on one side edge along the second direction, and the other side edge extends along the second direction to the edge of the PCB board along the second direction.

[0013] In one alternative embodiment, the projections of the two sides of the tab along the second direction onto the thickness direction of the cell are both located between the two sides of the clearance notch along the second direction.

[0014] In one alternative embodiment, the projection of the edge of the tab along the second direction near the side of the locally widened portion in the thickness direction of the cell is located between the edge of the clearance notch along the second direction and the edge of the PCB board along the second direction.

[0015] In one alternative embodiment, the battery cell protection board further includes a first reinforcing plate, which is fixedly connected to one side of the PCB board along the thickness direction, and the first reinforcing plate is made of metal.

[0016] Beneficial effects: A first reinforcing plate is fixedly connected to one side of the PCB board along the thickness direction. The rigid-flex plate is used to enhance the strength of the PCB board in the component area by adding the first reinforcing plate, ensuring that the PCB board does not deform.

[0017] In one alternative implementation, the first reinforcing plate is made of steel.

[0018] In one alternative implementation, the thickness of the PCB board is less than or equal to 0.5 mm along the thickness direction of the battery cell, and the thickness of the first reinforcing plate is less than or equal to 0.2 mm.

[0019] Beneficial effects: The entire PCM board adopts an ultra-thin design and a rigid-flex PCB structure. The PCB board thickness is less than or equal to 0.5mm, the FPC extends from the middle of the PCB board, and the reinforcing steel sheet thickness is less than or equal to 0.20mm. The total thickness of the entire PCM board is controlled within 0.7mm. This thickness has been verified through testing and has high reliability, passing various strength tests.

[0020] In one optional implementation, the cell protection board further includes:

[0021] FPC, which extends from one side of the PCB board, is made of flexible material; in the thickness direction perpendicular to the battery cell, the projection of the FPC is at least partially located on the outside of the PCB board.

[0022] The second reinforcing plate is fixedly connected to the FPC and is located in the area where the projection of the FPC is located on the outside of the PCB board.

[0023] Beneficial effects: By further setting a second reinforcing plate on the FPC and placing it in the area where the projection of the FPC is located outside the PCB board, the structural strength of the FPC can be improved.

[0024] In one alternative embodiment, the battery cell protection board further includes a conductive sheet disposed on the side of the PCB board away from the first reinforcing plate along the thickness direction, the conductive sheet being adapted to be electrically connected to the electrode tab.

[0025] In one alternative implementation, a thermally conductive coating is sprayed onto the outer side of the PCB board.

[0026] Beneficial effects: By spraying a thermally conductive coating on the outside of the PCB board, the heat dissipation effect of the battery cell protection board can be further increased, and the temperature rise of the device can be reduced.

[0027] In one alternative embodiment, the battery assembly further includes a thermally conductive head adhesive layer made of a thermally conductive material, suitable for wrapping the cell protection board.

[0028] Beneficial effects: Using thermally conductive material to form the thermally conductive head adhesive layer and wrapping it around the cell protection board can further reduce the temperature rise of the device. By ensuring the thermally conductive head adhesive layer completely covers the cell protection board, it can both reduce the temperature rise in the device area and provide insulation, thus more effectively protecting the cell protection board.

[0029] Secondly, the present invention also provides an electrical device, comprising: an electrical device body, and a battery assembly as described above that is electrically connected to the electrical device body.

[0030] Since the electrical device includes a battery assembly and has the same effect as the battery assembly, it will not be elaborated further here. Attached Figure Description

[0031] 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.

[0032] Figure 1 This is an exploded view of the battery assembly of this utility model;

[0033] Figure 2 This is a front view of the battery cell protection board and the battery cell in the installation state of this utility model;

[0034] Figure 3 This is a partial schematic diagram of the battery cell protection board and the battery cell installation state of this utility model;

[0035] Figure 4 This is an exploded view of the battery cell protection board and one side of the battery cell according to this utility model;

[0036] Figure 5 This is an exploded view of the battery cell protection board and the other side of the battery cell according to this utility model;

[0037] Figure 6 This is a partially enlarged view of the battery cell protection board and the battery cell classification status of this utility model;

[0038] Figure 7 for Figure 6 A schematic diagram of section AA.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Thermally conductive head adhesive layer; 2. Integrated adhesive layer; 3. Top sealing adhesive layer;

[0041] 4. Cell protection board; 41. PCB board (printed circuit board); 411. Partially widened section; 42. Conductive sheet; 43. FPC (flexible printed circuit board); 44. First reinforcing plate; 45. Second reinforcing plate; 46. Relief notch;

[0042] 5. Battery cell; 51. Electrode tab; 52. Top sealing slot;

[0043] 6. PET handle; 7. Tail adhesive layer; 8. Alcohol-based double-sided adhesive. Detailed Implementation

[0044] 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.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0048] Batteries typically come with a power protection circuit (PCM). Taking mobile phone batteries as an example, in some high-wattage projects, if the space for components on the PCM board is limited, the components may be densely packed. This can cause the temperature in the component area to rise rapidly, leading to severe overheating of the battery head, and in severe cases, potentially burning out the PCM board. However, as mobile phone batteries become thinner and lighter, especially with foldable screen phones, the battery space design is becoming more compact. How to ensure the heat dissipation performance of the PCM board within limited space has become a pressing issue.

[0049] In addition, to accommodate thinner battery cells, the PCM board needs to be thinner, but reducing the thickness will reduce the strength of the PCM board and pose a certain risk of deformation.

[0050] The design intention of the battery assembly provided in the embodiments of this utility model is to improve the strength, thickness and heat dissipation of the PCM board so as to be used with thinner and lighter battery cells.

[0051] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0052] According to an embodiment of the present invention, in one aspect, a battery assembly is provided, comprising:

[0053] The battery cell 5 has a tab 51 extending from one end along the first direction, and a top sealing groove 52 is formed on the same side of the tab 51.

[0054] The battery cell protection board 4 is electrically connected to the tab 51. The battery cell protection board 4 includes: a PCB board 41 (the PCB board is a printed circuit board, hereinafter referred to as the PCB board), at least a portion of the PCB board 41 extends along a first direction toward the side close to the battery cell 5 and forms a partially widened portion 411, the partially widened portion 411 being at least partially located within the top sealing groove 52; the PCB board 41 also forms a clearance notch 46, along the thickness direction of the battery cell 5, the projection of the tab 51 and the clearance notch 46 at least partially overlap; wherein, the thickness direction is perpendicular to the first direction.

[0055] The battery cell 5 includes a battery cell housing and an electrode assembly disposed inside the battery cell housing. The area of ​​the battery cell housing extending beyond the electrode assembly forms a top sealing groove 52 on the outside of the battery cell 5 through a folded edge.

[0056] The electrode group inside the battery cell 5 extends to form a tab 51, which extends out of the battery cell housing.

[0057] In this embodiment, the cell protection board 4 and the top sealing groove 52 are positioned opposite each other. By making reasonable use of the space in the top sealing groove 52, the overall space occupied by the battery assembly can be reduced and the energy density can be improved.

[0058] By extending at least a portion of the PCB board 41 along a first direction toward the side closer to the battery cell 5 to form a locally widened portion 411, and ensuring that the locally widened portion 411 is at least partially located within the top sealing groove 52, the area of ​​the PCB board 41 can be increased, thereby increasing heat conduction and thus increasing the overall heat dissipation area of ​​the battery cell protection board 4 and reducing device temperature rise. Simultaneously, the locally widened portion 411 increases the width of the PCB board 41, thereby improving the overall strength of the battery cell protection board 4.

[0059] Since the widened portion 411 is located at least partially within the top sealing groove 52, the area of ​​the top sealing groove 52 of the battery cell 5 can be reasonably utilized, thereby increasing the heat dissipation area of ​​the PCB board 41 without increasing the additional space occupied.

[0060] Furthermore, since the battery cell 5 extends a tab 51 on the same side as the top sealing groove 52, and the battery cell protection plate 4 is electrically connected to the tab 51, the tab 51 has tab adhesive. After the battery cell protection plate 4 is electrically connected to the tab 51, the thickness of the corresponding position of the tab 51 will be relatively thick. In this embodiment, when the locally widened portion 411 extends into the top sealing groove 52, it needs to avoid the position of the tab 51, thereby forming a clearance notch 46 on the PCB board 41. Along the thickness direction of the battery cell 5, the projection of the tab 51 and the clearance notch 46 at least partially overlap. This avoids the position of the tab 51, ensuring that the thickness of the head of the battery cell 5 is within the specification range. The battery cell protection plate 4 can avoid the thicker position of the tab 51, further reducing the thickness of the battery assembly head.

[0061] In some embodiments, combined with Figure 6 As shown, along the second direction, the clearance notch 46 and the locally widened portion 411 are staggered, wherein the second direction is perpendicular to both the first direction and the thickness direction of the cell 5.

[0062] It needs to be explained that, in combination Figure 2 , Figure 3 As shown, in this embodiment, the first direction can be the length direction of the battery assembly, the second direction can be the width direction of the battery assembly, and the thickness direction is the direction indicated by the arrow in the figure.

[0063] By staggering the clearance notch 46 and the local widening part 411, it is possible to ensure that the local widening part 411 avoids the position of the clearance notch 46, thereby avoiding the position of the tab 51, ensuring that the head thickness of the battery cell 5 is within the specification range, and at the same time increasing the heat dissipation area of ​​the PCB board 41.

[0064] In some embodiments, at least one clearance notch 46 is provided with a locally widened portion 411 on both sides of its second direction.

[0065] In this embodiment, the projections of the two sides of the tab 51 along the second direction onto the thickness direction of the cell 5 are both located between the two sides of the clearance notch 46 along the second direction.

[0066] As another implementation, in some embodiments, at least one clearance notch 46 is provided with a locally widened portion 411 on one side edge along the second direction, and the other side edge extends along the second direction to the edge of the PCB board 41 along the second direction.

[0067] In this embodiment, the projection of the edge of the tab 51 near the side of the locally widened portion 411 along the second direction in the thickness direction of the cell 5 is located between the edge of the clearance notch 46 along the second direction and the edge of the PCB board 41 along the second direction.

[0068] In some embodiments, combined with Figure 5 As shown, the battery cell protection board 4 also includes a first reinforcing plate 44, which is fixedly connected to one side of the PCB board 41 along the thickness direction. The first reinforcing plate 44 is made of metal.

[0069] A first reinforcing plate 44 is fixedly connected to one side of the PCB board 41 along the thickness direction. The first reinforcing plate 44 is used to enhance the strength of the PCB board 41 in the device area and ensure that the PCB board 41 does not deform.

[0070] In some embodiments, combined with Figure 4 As shown, the battery cell protection board 4 also includes a conductive sheet 42, which is disposed on the side of the PCB board 41 away from the first reinforcing plate 44 along the thickness direction. The conductive sheet 42 is adapted to be electrically connected to the tab 51.

[0071] The conductive sheet 42 can be a nickel sheet, which can be welded to the tab 51 to achieve electrical connection between the cell protection board 4 and the cell 5.

[0072] Combination Figure 7 As shown, the conductive sheet 42 is bent into a U-shape, and the tab 51 is set to correspond to the bending of the conductive sheet 42 in order to achieve good contact and save space.

[0073] In this embodiment, device components are disposed on the PCB board 41. A first reinforcing plate 44 is disposed on the non-device side of the PCB board 41, and a conductive sheet 42 is disposed on the device side of the PCB board 41. As a variation, the first reinforcing plate 44 can be interchanged with the device components.

[0074] In some embodiments, the first reinforcing plate 44 is made of steel.

[0075] As a variation, the first reinforcing plate 44 can also be made of other materials with higher strength than the PCB board 41.

[0076] In some embodiments, along the thickness direction of the cell 5, the thickness of the PCB board 41 is less than or equal to 0.5 mm, and the thickness of the first reinforcing plate 44 is less than or equal to 0.2 mm.

[0077] Because the battery cell protection board 4 adopts an ultra-thin design, by limiting the thickness of the PCB board 41 and the thickness of the first reinforcing plate 44, the total thickness of the battery cell protection board 4 can be kept within 0.7mm.

[0078] The entire PCM board adopts an ultra-thin design and a rigid-flex PCB structure. The PCB board thickness is less than or equal to 0.5mm, the FPC extends from the middle of the PCB board, and the reinforcing steel sheet thickness is less than or equal to 0.20mm. The total thickness of the entire PCM board is controlled within 0.7mm. This thickness has been verified through testing and has high reliability, passing various strength tests.

[0079] In some embodiments, combined with Figure 5 As shown, the cell protection board 4 also includes:

[0080] FPC (FPC stands for Flexible Circuit Board, hereinafter referred to as FPC) 43, which extends from one side of PCB board 41, is made of flexible material; in the thickness direction perpendicular to the cell 5, the projection of FPC 43 is at least partially located on the outside of PCB board 41.

[0081] The second reinforcing plate 45 is fixedly connected to the FPC43 and is located in the area outside the PCB board 41 where the projection of the FPC43 is located.

[0082] In this embodiment, FPC43 extends from the middle area of ​​PCB board 41. FPC43 is folded towards the side of PCB board 41 where the first reinforcing plate 44 is provided. After FPC43 is bent, it rests on PCB board 41, and its thickness does not exceed the thickness of the first reinforcing plate 44.

[0083] By further providing a second reinforcing plate 45 on the FPC43, and placing it in the area where the projection of the FPC43 is located outside the PCB board 41, the structural strength of the FPC43 can be improved.

[0084] In some embodiments, a thermally conductive coating is sprayed onto the outer side of the PCB board 41.

[0085] By spraying a thermally conductive coating on the outside of the PCB board 41, the heat dissipation effect of the battery cell protection board 4 can be further increased, and the temperature rise of the device can be reduced.

[0086] In some embodiments, combined with Figure 1 As shown, the battery assembly also includes: a thermally conductive head adhesive layer 1, which is made of a thermally conductive material and is suitable for wrapping the cell protection board 4.

[0087] Using a thermally conductive material to form the thermally conductive head adhesive layer 1, which then wraps around the cell protection board 4, can further reduce the temperature rise of the device. By ensuring that the thermally conductive head adhesive layer 1 completely covers the cell protection board 4, it can both reduce the temperature rise in the device area and provide insulation, thus more effectively protecting the cell protection board 4.

[0088] The battery assembly also includes an integrated adhesive layer 2, which can be an adhesive paper integrally formed from aramid paper and a silicone pad.

[0089] The battery assembly also includes: top sealing layer 3, PET handle 6, tail adhesive layer 7, and alcohol-based non-adhesive double-sided tape 8, etc.

[0090] According to an embodiment of the present invention, another aspect provides an electrical device, comprising:

[0091] The main body of the electrical device, and the battery assembly as described above that is electrically connected to the main body of the electrical device.

[0092] The battery pack in this embodiment uses a cell protection board 4 with better strength, thinner thickness, and better heat dissipation, which makes it easier to use with thinner and lighter cells and can further reduce the thickness of the battery head.

[0093] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. 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 all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery assembly, characterized in that, include: The battery cell (5) has a tab (51) extending from one end along a first direction, and the battery cell (5) has a top sealing groove (52) formed on the same side as the tab (51). A cell protection board (4) is electrically connected to the tab (51). The cell protection board (4) includes: a PCB board (41), at least a portion of which extends along the first direction toward the side close to the cell (5) and forms a partially widened portion (411), which is at least partially located within the top sealing groove (52); the PCB board (41) also forms a clearance notch (46), and along the thickness direction of the cell (5), the projection of the tab (51) overlaps at least partially with the clearance notch (46); wherein the thickness direction is perpendicular to the first direction.

2. The battery assembly according to claim 1, characterized in that, Along the second direction, the clearance notch (46) and the local widening portion (411) are staggered, wherein the second direction is perpendicular to both the first direction and the thickness direction of the cell (5).

3. The battery assembly according to claim 2, characterized in that, At least one of the clearance notches (46) is provided with the local widening portion (411) on both sides of the second direction.

4. The battery assembly according to claim 2, characterized in that, At least one of the clearance notches (46) is provided with the local widening (411) on one side edge along the second direction, and the other side edge extends along the second direction to the edge of the PCB board (41) along the second direction.

5. The battery assembly according to claim 3, characterized in that, The projections of the two sides of the tab (51) along the second direction onto the thickness direction of the cell (5) are both located between the two sides of the clearance notch (46) along the second direction.

6. The battery assembly according to claim 4, characterized in that, The projection of the edge of the tab (51) along the second direction near the side of the locally widened portion (411) in the thickness direction of the cell (5) is located between the edge of the clearance notch portion (46) along the second direction and the edge of the PCB board (41) along the second direction.

7. The battery assembly according to claim 1, characterized in that, The battery cell protection board (4) further includes a first reinforcing plate (44), which is fixedly connected to one side of the PCB board (41) along the thickness direction. The first reinforcing plate (44) is made of metal.

8. The battery assembly according to claim 7, characterized in that, The first reinforcing plate (44) is made of steel.

9. The battery assembly according to claim 7, characterized in that, Along the thickness direction of the battery cell (5), the thickness of the PCB board (41) is less than or equal to 0.5 mm, and the thickness of the first reinforcing plate (44) is less than or equal to 0.2 mm.

10. The battery assembly according to claim 1, characterized in that, The cell protection board (4) also includes: FPC (43), which extends from one side of the PCB board (41), is made of flexible material; in the thickness direction perpendicular to the cell (5), the projection of the FPC (43) is at least partially located on the outside of the PCB board (41); The second reinforcing plate (45) is fixedly connected to the FPC (43) and is disposed in the area where the projection of the FPC (43) is located outside the PCB board (41).

11. The battery assembly according to claim 7, characterized in that, The battery cell protection board (4) further includes a conductive sheet (42), which is disposed on the side of the PCB board (41) away from the first reinforcing plate (44) along the thickness direction. The conductive sheet (42) is adapted to be electrically connected to the tab (51).

12. The battery assembly according to any one of claims 1 to 11, characterized in that, The outer side of the PCB board (41) is coated with a thermally conductive coating.

13. The battery assembly according to any one of claims 1 to 11, characterized in that, The battery assembly further includes a thermally conductive head adhesive layer (1), which is made of a thermally conductive material and is suitable for wrapping the cell protection board (4).

14. An electrical appliance, characterized in that, include: The electrical device body and the battery assembly as described in any one of claims 1 to 13, which is electrically connected to the electrical device body.

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