A single cell and a battery pack

Abstract

This utility model discloses a single battery and battery pack, including a top cover assembly, a lower housing, and a battery cell. The top cover assembly and the lower housing are fixedly connected to form a cavity for housing the battery cell. The top cover assembly includes a top cover plate, a plastic support, a deformation plate, and a strain sensor. The top cover plate has a first surface facing the cavity and a through hole. The plastic support has a conductive portion. The plastic support is fixed to the first surface, and along a direction perpendicular to the first surface, the wall of the through hole at least partially overlaps with the projection of the conductive portion. The deformation plate is sandwiched and fixed between the plastic support and the top cover plate, and along a direction perpendicular to the first surface, the projection of the conductive portion is located within the projection of the deformation plate, and the deformation plate is sealed to the conductive portion. The strain sensor is located in the through hole and fixedly connected to the deformation plate. This utility model embodiment can achieve pressure monitoring and improve airtightness.

Description

Technical Field

[0001] This application relates to the field of electronic pen technology, and in particular to an electronic pen and electronic device. This utility model belongs to the field of battery pressure detection technology, specifically relating to a single battery cell and a battery pack. Background Technology

[0002] Accurately monitoring the internal pressure of a battery is an important measure to ensure its safe use. Currently, to collect internal pressure data, pressure sensors are typically placed directly inside the battery casing. A sensing wire passes through an opening in the casing and connects to an external chip to transmit the data.

[0003] However, maintaining a good airtight seal in the battery casing is an important indicator of battery quality, and this method of laying out the induction wires with openings reduces the battery's airtightness. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a single battery and battery pack that can monitor the internal pressure of the battery while improving the airtightness of the battery.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] This utility model provides a single battery cell, which includes a top cover assembly, a lower housing, and a battery cell. The top cover assembly and the lower housing are fixedly connected to form a receiving cavity, and the battery cell is disposed within the receiving cavity.

[0007] The top cover assembly includes a top cover plate, a plastic support, a deformation sheet, and a strain sensor;

[0008] The top cover plate has a first surface facing the receiving cavity, and the top cover plate is provided with a through hole;

[0009] The plastic support has a first side and a second side along the thickness direction, and the plastic support is provided with a conductive portion connecting the first side and the second side;

[0010] The plastic support is disposed on the first surface. Along a direction perpendicular to the first surface, the wall of the through hole forms a first projection on the first surface, and the conductive part forms a second projection on the first surface. The first projection and the second projection at least partially overlap.

[0011] The deformable sheet is clamped and fixed between the plastic support and the top cover plate, and along the direction perpendicular to the first surface, the deformable sheet forms a third projection on the first surface, the second projection is located within the third projection, and the deformable sheet is sealed to the conductive part;

[0012] The strain sensor is located inside the through hole and is fixedly connected to the deformation plate.

[0013] Optionally, the deformable sheet is a metal film, which is welded and fixed to the first surface.

[0014] Optionally, the metal film includes a welding portion and a deformation portion. The welding portion is located at the edge of the metal film and is arranged in an annular shape around the circumference of the deformation portion. The strain sensor is fixedly connected to the deformation portion.

[0015] Optionally, the thickness of the welded portion is greater than the thickness of the deformed portion.

[0016] Optionally, the second side of the plastic support is the side facing away from the top cover plate, and the second side of the plastic support is provided with a boss;

[0017] Along a direction perpendicular to the first surface, the boss forms a fourth projection on the first surface, the second projection is located within the fourth projection, and the boss is provided with a vent hole, which is connected to the conductive part.

[0018] Optionally, along a direction perpendicular to the first surface, the wall of the vent hole forms a fifth projection on the first surface;

[0019] The fifth projection is located within the fourth projection; and / or the fifth projection intersects with the fourth projection.

[0020] Optionally, the top cover plate is further provided with a positive terminal hole and a negative terminal hole, and the through hole is located between the positive terminal hole and the negative terminal hole.

[0021] Optionally, the top cover assembly further includes a battery protection plate, the top cover plate having a second surface, the battery protection plate being fixed to the second surface, the second surface being a surface opposite to the first surface;

[0022] The battery protection board is equipped with a processor, which is electrically connected to the strain sensor.

[0023] Optionally, the individual battery cell further includes an explosion-proof valve, which is disposed on the lower housing at a position opposite to the top cover assembly.

[0024] This application also provides a battery pack, which includes any of the aforementioned single-cell batteries.

[0025] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0026] In this embodiment of the battery, a through hole is formed in the top cover plate of the battery, and a conductive part communicating with the through hole is formed on the plastic support below the top cover plate. A deformation plate is clamped and fixed between the plastic support and the top cover plate, located at the position of the conductive part and the through hole. The deformation plate and the conductive part are sealed together, thus blocking and isolating the through hole and the conductive part. After the top cover assembly is sealed and fixedly connected to the lower shell of the battery, the internal pressure of the battery can act on the deformation plate through the conductive part, causing the strain sensor fixed on the deformation plate to activate. The pressure is converted into a stress signal from the strain sensor, enabling pressure monitoring inside the battery. Furthermore, since the strain sensor is located inside the through hole, it is outside the sealed cavity formed by the top cover plate, the deformation plate, and the lower shell, eliminating the need for opening holes and wiring on the battery casing, thereby improving the battery's airtightness.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is an exploded schematic diagram of a single battery according to an embodiment of the present invention;

[0030] Figure 2 This is an isometric schematic diagram of a top cover assembly according to an embodiment of the present utility model;

[0031] Figure 3 This is an exploded view of a top cover assembly according to an embodiment of the present utility model;

[0032] Figure 4 This is an embodiment of the present utility model. Figure 2 A schematic top view of the top cover assembly;

[0033] Figure 5 This is an embodiment of the present utility model. Figure 4 A cross-sectional view along the AA direction;

[0034] Figure 6 This is an embodiment of the present utility model. Figure 5 A magnified view of the middle I position;

[0035] Figure 7 This is a schematic diagram of a deformable component according to an embodiment of the present utility model;

[0036] Figure 8 This is an isometric schematic diagram of a plastic support according to an embodiment of the present invention;

[0037] Figure 9 This is an embodiment of the present utility model. Figure 1 A schematic top view of the battery;

[0038] Figure 10 This is an embodiment of the present utility model. Figure 9 A cross-sectional view along the BB direction;

[0039] Figure 11 This is an embodiment of the present utility model. Figure 10 A magnified view of a portion of position II.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Top cover assembly; 2. Lower housing; 3. Battery cell; 4. Explosion-proof valve; 10. Top cover plate; 11. Plastic support; 12. Deformation plate; 13. Strain sensor; 14. Battery protection board; 101. Through hole; 102. Positive terminal hole; 103. Negative terminal hole; 111. Conductive part; 112. Boss; 121. Welded part; 122. Deformation part; 1121. Vent hole. Detailed Implementation

[0042] The term "plural" in the specification and claims of this utility model means two or more. The terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship 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.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Reference Figure 1 This utility model embodiment provides a single-cell battery, combined with Figure 1As illustrated, the top cover assembly 1 can be fixedly connected to the lower housing 2 of the single battery to form the outer casing of the single battery. The outer casing has a receiving cavity for accommodating the battery cell 3, and the battery cell 3 of the single battery is installed in the receiving cavity of the outer casing. It can be understood that the lower housing 2 of the single battery can be a housing structure with an opening formed by a bottom shell and surrounding side walls, and the battery cell 3 can be inserted or removed from the opening of the lower housing 2.

[0046] After the battery cell 3 is installed into the inner cavity of the lower housing 2, the top cover assembly 1 is installed at the opening of the lower housing 2. The top cover assembly 1 and the lower housing 2 are then welded together using a welding process to complete the battery encapsulation.

[0047] like Figure 3 As illustrated, the top cover assembly 1 of this embodiment specifically includes a top cover plate 10, a plastic support 11, a deformation sheet 12, and a strain sensor 13. The top cover plate 10 may be a metal sheet of the same material as the lower housing 2 of the battery, used to seal and block the opening of the lower housing 2.

[0048] The plastic support 11 is an injection-molded part. After being stacked with the top cover plate 10, the plastic support 11 is located on one side of the first surface of the top cover plate 10. Furthermore, the plastic support 11 can also be glued or snapped to the first surface of the top cover plate 10. This first surface is a surface of the top cover plate 10 facing the housing cavity of the single battery cell. When the top cover assembly 1 is assembled and connected with the lower housing 2 of the single battery cell, the plastic support 11 is located between the top cover plate 10 and the battery cell 3, separating the top cover plate 10 from the battery cell 3, so that a space is formed in the middle to accommodate the tabs of the battery cell 3.

[0049] Combination Figure 3 As illustrated, the top cover plate 10 in this embodiment of the present invention is provided with a through hole 101. When the top cover plate is precisely manufactured, the axis of the through hole 101 is perpendicular to the first surface of the top cover plate 10, that is, along the thickness direction Z of the top cover plate 10. The through hole 101 connects both sides of the top cover plate 10. The plastic support 11 has a first side and a second side along the thickness direction Z. The plastic support 11 is provided with a guide portion 111 connecting the first side and the second side. This guide portion 111 can be a through hole extending through both sides of the plastic support 11 along the thickness direction Z. The guide portion 111 can also be a structure with a hole at the bottom of a groove.

[0050] like Figures 4 to 6 As shown, the plastic support 11 is stacked and installed on the top cover plate 10 and fixed on the first surface of the top cover plate 10. In the direction Z perpendicular to the first surface, the hole wall of the through hole 101 forms a first projection on the first surface, and the conductive part 111 forms a second projection on the first surface. The first projection and the second projection at least partially overlap, so that the conductive part 111 and the through hole 101 can cross and overlap in the Z direction.

[0051] In addition, such as Figures 4 to 6 As illustrated, in this embodiment of the invention, a deformable sheet 12 is sandwiched and fixed between the plastic support 11 and the top cover plate 10. The deformable sheet 12 is a flexible and deformable membrane structure part, which is dense and airtight, and can be made of non-metallic or metallic material. Along the direction Z perpendicular to the first surface, the deformable sheet 12 forms a third projection on the first surface. The second projection corresponding to the conductive part 111 is located within the third projection corresponding to the deformable sheet 12, that is, the deformable sheet 12 completely covers the conductive part 111, and the deformable sheet 12 is also sealed and connected to the conductive part 111 by means of bonding or other means, blocking and isolating the through hole 101 and the conductive part 111, so that the two are not connected to each other. Furthermore, the strain sensor 13 is located in the through hole 101 and is fixedly connected to the deformable sheet 12. When the deformable sheet 12 deforms, the strain sensor 13 can collect the corresponding stress.

[0052] Combination Figure 2 As illustrated in this embodiment, after the top cover assembly 1 and the lower housing 2 are connected and fixed, the top cover plate 10, the deformation plate 12, and the lower housing 2 together form a closed cavity. The plastic support 11 and the battery cell 3 are located inside the closed cavity, and the strain sensor 13 is located outside the closed cavity. When the pressure inside the closed cavity increases, it will act on the deformation plate 12 through the conductive part 111, causing the deformation plate 12 and the strain sensor 13 to deform. Thus, the strain sensor 13 can output an electrical signal indicating the magnitude of stress, which reflects the magnitude of pressure inside the closed cavity.

[0053] Therefore, in the top cover assembly 1 of this utility model embodiment, by opening a through hole 101 on the top cover plate 10, and opening a conductive part 111 overlapping the through hole 101 on the plastic support 11 below the top cover plate 10, and clamping and fixing the deformation plate 12 between the plastic support 11 and the top cover plate 101, and located at the position of the conductive part 111 and the through hole 101, the deformation plate 12 blocks and isolates the through hole 101 and the conductive part 111. After the top cover assembly 1 is sealed and fixedly connected to the lower shell 2 of the battery, the pressure inside the single battery can act on the deformation plate 12 in that part through the conductive part 111, and cause the strain sensor 13 fixed on the deformation plate 12 to act, converting the pressure into a stress signal of the strain sensor 13, thereby realizing the monitoring of the pressure inside the battery. Furthermore, since the strain sensor 13 is located inside the through hole, it is outside the sealed cavity formed by the top cover plate 10, the deformation plate 12, and the lower housing 2. Therefore, there is no need to make holes in the casing of the individual battery for wiring, which can improve the airtightness of the individual battery.

[0054] Optionally, in one embodiment, the deformable sheet 12 of this invention can be a thin metal film, thin enough to detect pressure changes inside the battery. For example, the thin metal film can be aluminum foil. This thin metal film can be fixedly connected to a metal top cover plate 10, welded to the through hole 101, completely covering the through hole 101. Thus, after the top cover plate 10 and the plastic support 11 are stacked and fixed, the deformable sheet 12 can reliably block and isolate the through hole 101 and the conductive portion 111, preventing a reduction in the airtightness of the individual battery cells.

[0055] Optionally, such as Figure 7 As shown, when a metal film is used as the deformation plate 12, the metal film includes a welding portion 121 and a deformation portion 122. The welding portion 121 is located at the edge of the metal film and is arranged in a ring shape around the circumference of the deformation portion 122. The welding portion 121 is welded and fixed to the top cover plate 10, covering the through hole 101. The area enclosed by the welding portion 121 is the deformation portion 122, and the aforementioned strain sensor 13 can be bonded and fixed together with the deformation portion 122. When the pressure inside the closed cavity of the single cell increases, it will act on the deformation portion 122 through the conductive portion 111, causing the deformation portion 122 and the strain sensor 13 to deform. Thus, the strain sensor 13 detects the corresponding pressure and converts it into an electrical signal.

[0056] Optionally, in one embodiment, the thickness of the welding portion 121 of the metal thin film in this invention is greater than the thickness of the deformed portion 122. This improves welding reliability, prevents structural damage to the metal thin film caused by welding, and avoids a reduction in the gas tightness of the individual battery cells.

[0057] Alternatively, in one implementation, such as Figure 8 As shown, in this embodiment of the invention, the second side of the plastic support 11 is the side facing away from the top cover plate 10, which is also the side of the plastic support 11 facing the inner cavity of the lower housing 2. A boss 112 is provided on the second side of the plastic support 11, and along the direction Z perpendicular to the first surface, the boss 112 forms a fourth projection on the first surface, with the second projection located within the fourth projection. A vent hole 1121 is provided on the boss 112, and the vent hole 1121 communicates with the conductive part 111. When this type of plastic support 11 is installed between the top cover plate 10 and the battery cell 3, the boss 112 can compress the contact tab, increasing the creepage distance between the tab and the aforementioned metal film, thus reducing the risk of arcing. Furthermore, the vent hole 1121 ensures that the gas pressure inside the single battery cell effectively acts on the metal film, causing deformation of the metal film and the strain sensor 13, ensuring the normal operation of the pressure detection function.

[0058] Alternatively, in one implementation, such as Figure 8As shown, in this embodiment of the invention, the vent hole 1121 on the boss 112 can be in different positions. Along a direction perpendicular to the first surface, the wall of the vent hole 1121 forms a fifth projection on the first surface. The fifth projection can be located at least within the fourth projection, in which case the vent hole 1121 is located in the central region of the boss 112. Furthermore, the fifth projection can also intersect with the fourth projection, in which case the vent hole 1121 is located at the edge of the boss 112. (Combined with...) Figure 8 As illustrated, the presence of vents 1121 at different locations, such as the central region and edges of the boss 112, prevents airflow obstruction caused by partial blockage of the vents 1121, ensuring that air pressure can act on the metal film and strain sensor 13 through the other vents 1121. For example, when the vents 1121 in the central region of the boss 112 are blocked by tabs or adhesive tape, the vents 1121 at the edges of the boss 112 can still breathe normally.

[0059] Alternatively, in one implementation, such as Figure 3 As shown, the top cover plate 10 is provided with a positive terminal hole 102 and a negative terminal hole 103 along its length. The positive terminal hole 102 is used to install and fix the positive terminal assembly, and the negative terminal hole 103 is used to install and fix the negative terminal assembly. In this embodiment of the present invention, the through hole 101 where the strain sensor 13 is placed can be located between the positive terminal hole 102 and the negative terminal hole 103. This allows the signal line between the strain sensor 13 and the processor outside the battery cell 3 to be shorter, which can shorten the signal transmission path and reduce signal transmission interference.

[0060] Alternatively, in one implementation, such as Figures 9 to 11 As shown, the top cover assembly 1 of this embodiment further includes a battery protection board 14. The top cover 10 has a second surface, which is a surface opposite to the first surface, i.e., the second surface is the surface of the top cover 10 that is opposite to the inner cavity of the lower housing 2. The battery protection board 14 is fixed to the second surface, so that the battery protection board 14 is outside the receiving cavity. The circuit carrier of the battery protection board 14 can be a PCB (Printed Circuit Board) or an FPC (Flexible Printed Circuit). The circuit carrier is centered on a processor and can also be equipped with electronic components for monitoring and managing battery charging and discharging. These electronic components and the processor together form the protection circuit on the battery protection board 14. The aforementioned strain sensor 13 can be electrically connected to the processor through wires or an FPC to transmit electrical signals to the processor for analysis and processing. Of course, in addition, the strain sensor 13 can also be a sensor with wireless transmission function, which can wirelessly transmit data with the wireless transceiver on the battery protection board 14.

[0061] In the battery of this embodiment, in addition to using the top cover assembly 1 to externalize the strain sensor 13, thereby improving the airtightness of the battery, an explosion-proof valve 4 can also be installed at the bottom of the individual battery cells opposite to the top cover assembly 1 to provide a pressure relief function and prevent explosion when the internal pressure of the battery is too high.

[0062] Furthermore, in this embodiment of the invention, the batteries described above can be stacked and arranged in a housing, and the individual batteries can be electrically connected and combined to form a battery pack product. This battery pack product can independently detect the pressure of each individual battery and has good airtightness.

[0063] Finally, it should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A single-cell battery, characterized in that, The single battery includes a top cover assembly (1), a lower housing (2), and a battery cell (3). The top cover assembly (1) and the lower housing (2) are fixedly connected to form a receiving cavity, and the battery cell (3) is disposed in the receiving cavity. The top cover assembly (1) includes a top cover plate (10), a plastic support (11), a deformation sheet (12), and a strain sensor (13); The top cover plate (10) has a first surface facing the receiving cavity, and the top cover plate (10) is provided with a through hole (101); The plastic support (11) has a first side and a second side along the thickness direction, and the plastic support (11) is provided with a conductive part (111) connecting the first side and the second side; The plastic support (11) is disposed on the first surface. Along the direction perpendicular to the first surface, the hole wall of the through hole (101) forms a first projection on the first surface, and the conductive part (111) forms a second projection on the first surface. The first projection and the second projection at least partially overlap. The deformable sheet (12) is clamped and fixed between the plastic support (11) and the top cover plate (10), and along the direction perpendicular to the first surface, the deformable sheet (12) forms a third projection on the first surface, the second projection is located within the third projection, and the deformable sheet (12) is sealed to the conductive part (111); The strain sensor (13) is located inside the through hole (101) and is fixedly connected to the deformation plate (12).

2. The single-cell battery according to claim 1, characterized in that, The deformable sheet (12) is a metal film, which is welded and fixed to the first surface.

3. The single-cell battery according to claim 2, characterized in that, The metal film includes a welding part (121) and a deformation part (122). The welding part (121) is located at the edge of the metal film and is arranged in an annular shape around the circumference of the deformation part (122). The strain sensor (13) is fixedly connected to the deformation part (122).

4. The single-cell battery according to claim 3, characterized in that, The thickness of the welded part (121) is greater than the thickness of the deformed part (122).

5. The single-cell battery according to claim 1, characterized in that, The second side of the plastic support (11) is the side facing away from the top cover plate (10), and a boss (112) is provided on the second side of the plastic support (11); Along a direction perpendicular to the first surface, the boss (112) forms a fourth projection on the first surface, the second projection is located within the fourth projection, and the boss (112) is provided with a vent hole (1121), which communicates with the guide portion (111).

6. The single-cell battery according to claim 5, characterized in that, Along a direction perpendicular to the first surface, the wall of the vent (1121) forms a fifth projection on the first surface; The fifth projection is located within the fourth projection; and / or, The fifth projection intersects with the fourth projection.

7. The single-cell battery according to claim 1, characterized in that, The top cover plate (10) is also provided with a positive terminal hole (102) and a negative terminal hole (103), and the through hole (101) is located between the positive terminal hole (102) and the negative terminal hole (103).

8. The single-cell battery according to claim 1, characterized in that, The top cover assembly also includes a battery protection plate (14), the top cover plate (10) has a second surface, the battery protection plate (14) is fixed to the second surface, the second surface is a surface that is opposite to the first surface; The battery protection board (14) is equipped with a processor, which is electrically connected to the strain sensor (13).

9. The single-cell battery according to claim 1, characterized in that, The single battery also includes an explosion-proof valve (4), which is located on the lower housing (2) at a position opposite to the top cover assembly (1).

10. A battery pack, characterized in that, The battery pack includes the individual cells as described in any one of claims 1 to 9.

Images