battery

Abstract

The application discloses a battery, and relates to the technical field of battery design. The battery comprises a battery core, a battery protection plate and an injection molding part. The battery core comprises a battery core body and a packaging edge connected with each other. The packaging edge is arranged around at least part of the battery core body. The thickness of the packaging edge is smaller than the thickness of the battery core body. The battery core body is provided with a tab. One end of the tab penetrates through the packaging edge and is stacked with the battery protection plate in the thickness direction of the battery core body. The tab is electrically connected with the battery protection plate. The injection molding part wraps the tab, part of the packaging edge and part of the battery protection plate. One side of the battery protection plate, which is away from the tab, is exposed to the injection molding part. The scheme can solve the problem that the thickness of the head of the battery is large.

Description

Technical Field

[0001] This application belongs to the field of battery design technology, and specifically relates to a battery. Background Technology

[0002] Thinner and lighter designs are a current trend in tablet computer development, making them more portable and easier for users to carry and use. As a core component of tablet computers, the battery occupies a significant portion of the space, necessitating its own trend towards thinner and lighter designs. Waterproofing testing, a crucial safety test during battery manufacturing, requires batteries to meet specific waterproofing standards.

[0003] In practical applications, battery waterproofing methods include coating components with conformal coating, wrapping with waterproof tape, and low-voltage injection molding to wrap the cell head. Among these, coating components with conformal coating and wrapping with waterproof tape offer low waterproofing levels, while low-voltage injection molding to wrap the cell head can achieve a higher waterproofing level. Currently, the conventional battery manufacturing method involves placing the battery protection board in a deep pit in the cell before injection molding the head to achieve waterproofing. This method produces ultra-thin batteries with a head thickness of approximately 2.5mm, which is relatively large. When installed in a tablet computer, this requires additional clearance, resulting in wasted space and reduced product competitiveness. Utility Model Content

[0004] The purpose of this application is to provide a battery that can solve the problem of excessive thickness in the current battery head.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: This application provides a battery including a cell, a battery protection board, and an injection molded part. The cell includes a connected cell body and an encapsulation edge. The encapsulation edge surrounds at least a portion of the cell body and has a thickness less than the thickness of the cell body. The cell body has a tab, one end of which passes through the encapsulation edge and is stacked with the battery protection board in the thickness direction of the cell body. The tab is electrically connected to the battery protection board. The injection molded part encapsulates a portion of the tab, the encapsulation edge, and the battery protection board. The side of the battery protection board facing away from the tab is exposed in the injection molded part.

[0006] In this embodiment, since the side of the battery protection board facing away from the tabs is exposed on the injection-molded part, this side serves as a sealing surface, eliminating the need for adhesive application on this side and thus reducing the thickness of the battery head. Furthermore, during the manufacturing of the ultra-thin battery, low-pressure injection molding is used to wrap the cell head to achieve a higher waterproof rating, and the side of the battery protection board facing away from the tabs is used as a sealing surface, further reducing the thickness of the battery head and resulting in a smaller overall battery thickness. In this case, when the battery is installed in an electronic device, no additional clearance is required, avoiding wasted space and achieving a thinner and lighter electronic device, thereby enhancing product competitiveness. Therefore, this embodiment solves the problem of the current large thickness of batteries. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the battery structure disclosed in the embodiments of this application; Figure 2 This is an exploded view of the battery disclosed in an embodiment of this application; Figure 3 This is a schematic diagram of the battery cell structure disclosed in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the injection molded part disclosed in the embodiments of this application; Figures 5 to 6 These are schematic diagrams of the battery protection board disclosed in the embodiments of this application from different perspectives. Figure 7 This is a partial cross-sectional view of the battery disclosed in an embodiment of this application.

[0008] Explanation of reference numerals in the attached figures: 100 - Battery cell, 110 - Battery cell body, 111 - Electrode, 120 - Encapsulation edge, 121 - First edge, 122 - Second edge, 123 - Third edge; 200-Battery protection board, 210-Flexible circuit board, 211-Circuit board body, 212-Circuit board stub, 220-Reinforcing board, 230-Connector, 240-Functional device; 300 - Injection molded part, 310 - First surface, 320 - Second surface, 330 - First injection section, 340 - Second injection section, 341 - First injection sub-segment, 342 - Second injection sub-segment, 343 - Third injection sub-segment, 350 - Third injection section; 400 - Insulating tape. Detailed Implementation

[0009] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0010] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0011] The battery provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0012] like Figures 1 to 7 As shown in the illustration, this application provides a battery comprising a cell 100, a battery protection board 200, and an injection-molded part 300. The cell 100 includes a connected cell body 110 and an encapsulation edge 120. Optionally, during battery manufacturing, an aluminum-plastic film is typically used to seal the electrolyte and electrode materials inside the cell 100 to isolate external substances such as moisture and oxygen, preventing electrolyte decomposition and electrode oxidation, thereby ensuring stable battery performance. Therefore, the encapsulation edge 120 can specifically be a partial structure of the aluminum-plastic film. The encapsulation edge 120 is disposed around at least a portion of the cell body 110, and the thickness of the encapsulation edge 120 is less than the thickness of the cell body 110. The cell body 110 includes an aluminum-plastic film, electrolyte, and electrode materials, while the encapsulation edge 120 consists only of two stacked layers of aluminum-plastic film. The cell body 110 has tabs 111. Optionally, the tabs 111 include a positive tab and a negative tab. One end of the tab 111 passes through the encapsulation edge 120 and is stacked with the battery protection plate 200 in the thickness direction of the cell body 110. The tab 111 is electrically connected to the battery protection plate 200. The injection molded part 300 covers the tab 111, a portion of the encapsulation edge 120, and a portion of the battery protection plate 200. The side of the battery protection plate 200 facing away from the tab 111 is exposed in the injection molded part 300. When the cell 100 is placed into the receiving cavity of the injection mold, the side of the battery protection plate 200 facing away from the tab 111 contacts the inner wall of the receiving cavity of the injection mold to prevent the injection molding compound from flowing in.

[0013] In this embodiment, since the side of the battery protection board 200 facing away from the tab 111 is exposed on the injection molded part 300, this side serves as a sealing surface, eliminating the need for adhesive application on that side, thus reducing the thickness of the battery head. Furthermore, during the manufacturing of the ultra-thin battery, low-pressure injection molding is used to wrap the cell head to achieve a higher waterproof rating, and the side of the battery protection board 200 facing away from the tab 111 serves as a sealing surface, further reducing the thickness of the battery head and resulting in a smaller overall battery thickness. In this case, when the battery is installed in an electronic device, no additional clearance is required, avoiding wasted space and achieving a thinner and lighter electronic device, thereby enhancing product competitiveness. Therefore, this embodiment solves the current problem of excessively thick battery heads.

[0014] Optionally, the battery protection board 200 can be a rigid circuit board; or, in other optional embodiments, the battery protection board 200 includes a flexible circuit board 210 and a reinforcing plate 220, optionally the reinforcing plate 220 can be a steel sheet structure. The flexible circuit board 210 includes a connected circuit board body 211 and a circuit board branch 212. A connector 230 of the battery protection board 200 is disposed on the circuit board branch 212. The connector 230 is used to electrically connect to an external device to transmit current. The circuit board body 211 and the reinforcing plate 220 are stacked, and the tab 111 is stacked on the side of the circuit board body 211 facing away from the reinforcing plate 220, and the tab 111 is electrically connected to the circuit board body 211. The injection molded part 300 covers a portion of the circuit board body 211 and the reinforcing plate 220. The side of the reinforcing plate 220 facing away from the tab 111 is exposed in the injection molded part 300, that is, the side of the reinforcing plate 220 facing away from the tab 111 is used as a sealing surface. The battery protection board 200 in this solution is made of a flexible circuit board 210 and a reinforcing plate 220. The flexible circuit board 210 is used to realize functions such as transmitting current and signals, and the reinforcing plate 220 is used to enhance the structural strength of the flexible circuit board 210. Since the thickness of the flexible circuit board 210 is small and the thickness of the reinforcing plate 220 can be reduced due to its own structural strength, the thickness of the battery protection board 200 made of the flexible circuit board 210 and the reinforcing plate 220 is smaller than that of the rigid circuit board. In a further optional embodiment, the battery protection board 200 also includes a functional component 240. The functional component 240 is disposed on the side of the circuit board body 211 facing away from the reinforcing plate 220. That is, this solution adopts a single-sided component arrangement, with the injection-molded part 300 wrapping the functional component 240. The distance between the functional component 240 and the first surface 310 of the injection-molded part 300 is 0.3~0.35mm, and the first surface 310 is located on the side of the flexible circuit board 210 facing away from the reinforcing plate 220. In this solution, the functional component 240 adopts a single-sided component arrangement, which can reduce the thickness of the battery protection board 200. At the same time, the thickness of the injection-molded part 300 on the side of the functional component 240 facing away from the flexible circuit board 210 is set to 0.3~0.35mm, which is reduced compared to 0.4mm in the prior art, so as to further reduce the thickness of the battery head. Of course, the distance between the functional component 240 and the first surface 310 can also be greater than 0.35mm. Optionally, the distance between the functional device 240 and the first surface 310 of the injection molded part 300 can be 0.31 mm, which can be selected according to actual needs. This application embodiment does not impose specific restrictions on this.

[0015] It should be noted that although the above solution reduces the thickness of the injection molded part 300 on the side of the functional device 240 away from the flexible circuit board 210, the area where the functional device 240 is located is small, only existing in the precision resistor area, about 2*2mm. The risk of insufficient glue is small and can even be ignored. Therefore, it will not have much impact on the performance of the battery protection board 200 itself. In another optional embodiment, the injection molded part 300 includes a first injection molding segment 330, a second injection molding segment 340, and a third injection molding segment 350 connected in sequence. The second injection molding segment 340 is bent relative to the first injection molding segment 330, and the third injection molding segment 350 is bent relative to the second injection molding segment 340. The third injection molding segment 350 is opposite to the first injection molding segment 330, that is, the injection molded part 300 has a U-shaped structure. The first injection molding segment 330 wraps at least a portion of the first edge 121 of the encapsulation edge 120, the second injection molding segment 340 wraps the second edge 122 of the encapsulation edge 120, one end of the tab 111 passes through the second edge 122 and is electrically connected to the battery protection board 200, and the third injection molding segment 350 wraps at least a portion of the third edge 123 of the encapsulation edge 120. During low-pressure injection molding, when the battery cell 100 is placed into the injection mold, space for glue flow is reserved on both sides of the battery cell 100 in its width direction to form the aforementioned first injection section 330 and third injection section 350, thereby sealing the first edge 121 and third edge 123 of the encapsulation edge 120 to improve the sealing performance of the battery. Of course, the aforementioned first injection section 330 and third injection section 350 may also be omitted. Optionally, the first injection molding segment 330 may cover the entire first edge 121, and the third injection molding segment 350 may cover the entire third edge 123; or, in other optional embodiments, the first injection molding segment 330 covers the first part of the first edge 121, and the third injection molding segment 350 covers the first part of the third edge 123. The battery also includes a first sealing block and a second sealing block. Optionally, at least one of the first sealing block and the second sealing block may be a silicone block, or other types of sealing structures. This application embodiment does not impose specific limitations on this. The first sealing block covers the second part of the first edge 121 and is sealed to the first injection molding segment 330. The second sealing block covers the second part of the third edge 123 and is sealed to the second injection molding segment 340. Both the first sealing block and the second sealing block are located at the end of the cell body 110 away from the battery protection board 200. Because the cell 100 is relatively thin, there is a risk of it falling off after the adhesive is applied to the bottom. This solution addresses this by setting length tolerances: the length of the first injection molding section 330 is less than the length of the first edge 121, so that the first injection molding section 330 wraps the first part of the first edge 121; the length of the third injection molding section 350 is less than the length of the third edge 123, so that the third injection molding section 350 wraps the first part of the third edge 123; and then the first sealing block and the second sealing block are used to wrap the second part of the first edge 121 and the second part of the third edge 123 respectively, and a sealed connection is made, thereby improving the waterproof performance of the battery.

[0016] Optionally, the length of at least one of the second portion of the first edge 121 and the second portion of the third edge 123 can be about 0.3 mm. Of course, it can also be selected according to actual needs. This application embodiment does not impose specific limitations on this.

[0017] In another optional embodiment, the second injection molding segment 340 includes a first injection molding sub-segment 341, a second injection molding sub-segment 342, and a third injection molding sub-segment 343 connected in sequence. The width of the second injection molding sub-segment 342 is greater than the width of the first injection molding sub-segment 341 and the width of the third injection molding sub-segment 343. Here, the width specifically refers to the dimension of the second injection molding segment 340 in the extension direction of the first injection molding segment 330. Optionally, the width of the first injection molding sub-segment 341 can be equal to the width of the third injection molding sub-segment 343. The second injection molding segment 342 covers the portion of the tab 111 and the battery protection board 200. Since the length of the battery protection board 200 is usually less than the width of the cell 100, during the low-pressure injection molding process, when the cell 100 is placed in the injection mold, the battery protection board 200 can be provided with clearance on both sides in its length direction (for example, the injection mold is provided with protrusions) to avoid glue leakage, thereby preventing excessive thickness of the injection molding glue, resulting in shrinkage, insufficient strength, and other phenomena. Of course, the width of each part of the second injection section 340 can also be equal.

[0018] In an optional embodiment, the widths of the first injection molding section 330 and the third injection molding section 350 are both greater than or equal to 0.8 mm. Because the strength of the battery cell 100 on both sides (i.e., the first edge 121 and the third edge 123) in its width direction is low and difficult to fix, there is a risk of misalignment during the injection molding process. This could lead to exposed side sealing edges. By setting the reserved glue flow space to be greater than or equal to 0.8 mm, sufficient misalignment space is ensured, thereby preventing the sealing edges 120 on both sides of the battery cell 100 from being exposed. Accordingly, after injection molding, the widths of the first injection molding section 330 and the third injection molding section 350 of the formed injection molded part 300 are also greater than or equal to 0.8 mm. Of course, the aforementioned reserved glue flow space can also be less than 0.8 mm, or selected according to actual needs; this application embodiment does not impose specific limitations on this.

[0019] In an optional embodiment, the battery further includes insulating tape 400, which is disposed on the side of the tab 111 facing away from the battery protection board 200. The battery protection board 200 and the cell 100 are connected only by the tab 111, which poses a risk of breakage during low-pressure injection molding. Therefore, when the cell 100 is placed into the cavity of the injection mold, the tab 111 is pressed and fixed by an ejector pin during low-pressure injection molding. At this time, insulating tape is attached to the surface of the tab 111 to protect it. Furthermore, after low-pressure injection molding is completed, only the insulating tape is exposed at the location of the ejector pin. When the battery is in operation, the insulating tape can prevent short circuits in the tab 111.

[0020] Optionally, the aforementioned ejector pin can be a waist-shaped ejector pin, and the plane in contact with the tab 111 can be rectangular, that is, the length of the rectangle can be 3mm and the width can be 1mm, so as to increase the contact area between the ejector pin and the tab 111, thereby avoiding damage to the tab 111 by the ejector pin and thus protecting the tab 111.

[0021] Optionally, in the above embodiments, when the battery cell 100 is placed into the receiving cavity of the injection mold, an ejector pin can be added to raise and fix the battery protection plate 200, so that the battery protection plate 200 remains stable during the injection molding process; Optionally, the height at which the ejector pin raises the battery protection plate 200 can be 0.3~0.35mm, that is, the height at which the ejector pin raises the battery protection plate 200 can be equal to the distance between the functional device 240 and the first surface 310.

[0022] In another optional embodiment, the injection-molded part 300 has a first surface 310 and a second surface 320 facing away from each other in the thickness direction of the battery cell 100. The first surface 310 is located on the side of the flexible circuit board 210 away from the reinforcing plate 220. Optionally, the second surface 320 can be flush with the side of the battery protection board 200 away from the tab 111. The battery cell 100 has a first state and a second state. The first state can be the normal state of the battery cell 100, and the second state can be the expanded state of the battery cell 100. When the battery cell 100 is in the first state, that is, in the normal state, the distance between the first surface 310 and the second surface 320 is greater than the thickness of the battery cell body 110. When the battery cell 100 is in the second state, that is, in the expanded state, the distance between the first surface 310 and the second surface 320 is equal to the thickness of the battery cell body 110. This design reserves a certain amount of expansion space based on the performance of the battery cell 100 itself, so as to prevent the battery from being damaged by other structures in the battery compartment after it expands due to high temperature during operation, thereby protecting the battery and extending its service life.

[0023] In / or other optional embodiments, when the cell 100 is in the second state, the distance between the first surface 310 and the second surface 320 is 1.31~1.36mm. During the manufacturing of the ultra-thin battery, the thickness of the main body of the battery protection board 200, i.e., the thickness A after the flexible circuit board 210 and the reinforcing plate 220 are stacked, can be 0.45mm; the height B of the functional device 240 of the battery protection board 200 can be 0.56mm; and the distance C between the functional device 240 and the first surface 310 can be 0.3~0.35mm, so that the thickness of the entire battery head is 1.31~1.36mm, thereby meeting the thickness requirements of the ultra-thin battery. Optionally, the distance C between the functional device 240 and the first surface 310 can be 0.31mm, in which case the thickness of the entire battery head is 1.32mm. Of course, the above values ​​can also be adjusted according to actual needs, and this application embodiment does not impose specific limitations on this.

[0024] It should be noted that when the cell 100 is in the first state, the thickness of the cell body 110 can be less than the thickness of the battery head, thus reserving a certain expansion space for the cell body 110.

[0025] In another optional embodiment, the battery protection board 200 and the encapsulation edge 120 are spaced apart, forming a gap between them. Since the encapsulation edge 120 is typically made of aluminum-plastic film, and the battery protection board 200 contains metal structures such as copper, the battery protection board 200 and the encapsulation edge 120 need to be spaced apart to prevent short circuits during battery operation. Optionally, the gap between the battery protection board 200 and the encapsulation edge 120 is greater than or equal to 8mm to ensure good insulation between them. Of course, the width of the gap between the battery protection board 200 and the encapsulation edge 120 can also be selected according to actual needs; this embodiment does not impose specific limitations on this.

[0026] Alternatively, the battery information can be printed onto the surface of the cell body 110 (i.e., on the aluminum-plastic film) by screen printing, thereby avoiding the need to attach labels to the surface of the cell 100 and further reducing the thickness of the battery.

[0027] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery, characterized in that, The device includes a battery cell (100), a battery protection board (200), and an injection molded part (300). The battery cell (100) includes a connected cell body (110) and an encapsulation edge (120). The encapsulation edge (120) is disposed around at least a portion of the cell body (110). The thickness of the encapsulation edge (120) is less than the thickness of the cell body (110). The cell body (110) has a tab (111), one end of which passes through the encapsulation edge (300). The encapsulation edge (120) and the battery protection plate (200) are stacked in the thickness direction of the cell body (110), and the tab (111) is electrically connected to the battery protection plate (200). The injection molded part (300) wraps the tab (111), a portion of the encapsulation edge (120) and a portion of the battery protection plate (200). The side of the battery protection plate (200) facing away from the tab (111) is exposed on the injection molded part (300).

2. The battery according to claim 1, characterized in that, The battery protection board (200) includes a flexible circuit board (210) and a reinforcing plate (220). The flexible circuit board (210) includes a connected circuit board body (211) and a circuit board branch (212). The connector (230) of the battery protection board (200) is disposed on the circuit board branch (212). The circuit board body (211) and the reinforcing plate (220) are stacked. The tab (111) is stacked on the side of the circuit board body (211) away from the reinforcing plate (220) and is electrically connected to the circuit board body (211). The injection molded part (300) covers a portion of the circuit board body (211) and the reinforcing plate (220). The side of the reinforcing plate (220) away from the tab (111) is exposed on the injection molded part (300).

3. The battery according to claim 2, characterized in that, The battery protection board (200) also includes a functional device (240), which is disposed on the side of the circuit board body (211) away from the reinforcing plate (220). The injection molded part (300) wraps the functional device (240). The distance between the functional device (240) and the first surface (310) of the injection molded part (300) is 0.3~0.35mm. The first surface (310) is located on the side of the flexible circuit board (210) away from the reinforcing plate (220).

4. The battery according to claim 1, characterized in that, The injection molded part (300) includes a first injection molding segment (330), a second injection molding segment (340), and a third injection molding segment (350) connected in sequence. The second injection molding segment (340) is bent relative to the first injection molding segment (330), and the third injection molding segment (350) is bent relative to the second injection molding segment (340). The third injection molding segment (350) is opposite to the first injection molding segment (330). The first injection molding segment (330) wraps at least a portion of the first edge (121) of the encapsulation edge (120), and the second injection molding segment (340) wraps the second edge (122) of the encapsulation edge (120). One end of the tab (111) passes through the second edge (122) and is electrically connected to the battery protection board (200). The third injection molding segment (350) wraps at least a portion of the third edge (123) of the encapsulation edge (120).

5. The battery according to claim 4, characterized in that, The first injection molding segment (330) wraps the first part of the first edge (121), and the third injection molding segment (350) wraps the first part of the third edge (123). The battery also includes a first sealing block and a second sealing block. The first sealing block wraps the second part of the first edge (121) and is sealed to the first injection molding segment (330). The second sealing block wraps the second part of the third edge (123) and is sealed to the second injection molding segment (340). The first sealing block and the second sealing block are both located at the end of the cell body (110) away from the battery protection board (200).

6. The battery according to claim 4, characterized in that, The second injection molding segment (340) includes a first injection molding sub-segment (341), a second injection molding sub-segment (342), and a third injection molding sub-segment (343) connected in sequence. The width of the second injection molding sub-segment (342) is greater than the width of the first injection molding sub-segment (341) and the width of the third injection molding sub-segment (343). The second injection molding sub-segment (342) wraps around the portion of the tab (111) and the battery protection plate (200).

7. The battery according to claim 4, characterized in that, The width of the first injection molding section (330) and the third injection molding section (350) is greater than or equal to 0.8 mm.

8. The battery according to claim 1, characterized in that, The battery also includes insulating tape (400), which is disposed on the side of the tab (111) facing away from the battery protection plate (200).

9. The battery according to claim 1, characterized in that, The injection molded part (300) has a first side (310) and a second side (320) opposite to each other in the thickness direction of the battery cell (100), and the battery cell (100) has a first state and a second state. When the battery cell (100) is in the first state, the distance between the first surface (310) and the second surface (320) is greater than the thickness of the battery cell body (110); when the battery cell (100) is in the second state, the distance between the first surface (310) and the second surface (320) is equal to the thickness of the battery cell body (110); and / or, When the cell (100) is in the second state, the distance between the first surface (310) and the second surface (320) is 1.31~1.36mm.

10. The battery according to claim 1, characterized in that, The battery protection board (200) is spaced apart from the encapsulation edge (120), and a gap is formed between the battery protection board (200) and the encapsulation edge (120), the gap being greater than or equal to 8mm.

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