Battery protection plate and battery
By designing a plastic-encapsulated module and a tab connection on the battery protection board, electrical connection between the battery cell and the battery protection board in the width direction is achieved, solving the problem of space occupation by the tab connection in the existing technology and improving the battery capacity.
Patent Information
- Application Number
- CN202522318130.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-10-30
AI Technical Summary
In the existing technology, the connection between the battery protection board and the battery cell's tabs occupies space along the length of the battery, limiting further increases in battery capacity.
A battery protection board was designed, including a circuit board and a plastic-encapsulated module. The conductive component is electrically connected to the circuit board, and the tab connection part extends along the width direction of the circuit board and is exposed, directly electrically connected to the tab of the battery cell, thus avoiding the space occupied by the electrical connection in the length direction of the battery.
By shifting the tab connection location from the thickness direction of the circuit board to the width direction, the assembly spacing in the length direction of the battery is reduced, thereby increasing the battery capacity.
Smart Images
Figure CN224946812U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lithium-ion battery technology, and in particular to a battery protection board and a battery. Background Technology
[0002] Lithium-ion batteries are widely used in various electronic devices. In order to improve the battery life of electronic devices, most devices tend to use batteries with larger capacity.
[0003] From a structural perspective, lithium-ion batteries mainly consist of a cell and a battery protection board located at the head of the cell. The battery protection board typically has a SIP (System in Package) module with specific functions on one side and conductive components on the other side. These conductive components are then welded to the tabs of the cell, forming an electrical connection between the cell and the battery protection board.
[0004] In existing technical solutions, when the battery protection board is placed parallel to the head of the battery cell (parallel placement of the battery protection board means that the thickness direction of the battery protection board is parallel to the length direction of the battery cell), the conductive components are often set on one side of the battery protection board in the thickness direction, and the electrode tabs of the battery cell are connected to the conductive components on the battery protection board by bending. The two are stacked in the thickness direction of the circuit board (i.e., the length direction of the battery cell), thereby increasing the space occupied by the battery protection board at the head of the battery cell.
[0005] Within the constraints of a given battery size, the smaller the space occupied by the battery protection board, the larger the space available for the battery cells, and thus the larger the battery capacity. However, in existing technologies, the tabs and conductive components, after being welded together, still occupy space along the length of the battery, hindering further increases in battery capacity. Utility Model Content
[0006] The purpose of this invention is to provide a battery protection board and a battery to improve battery capacity to a certain extent.
[0007] The first aspect of this utility model provides a battery protection board, including a circuit board and a plastic-encapsulated module; The molding module has a conductive component encapsulated inside, and the molding module is electrically connected to one side of the circuit board along a first direction through one end of the conductive component. A tab connection portion is formed on one side of the conductive component. The encapsulation module exposes the tab connection portion along the second direction of the circuit board so that the tab connection portion is electrically connected to the tab of the battery cell. The second direction is the width direction of the circuit board, and the first direction is perpendicular to the second direction.
[0008] Furthermore, the molding module includes a substrate, electronic components, and a molding compound; The electronic device and the conductive component are both encapsulated on the substrate by the same molding compound and electrically connected to the circuit board through the substrate. Alternatively, the conductive element and the electronic device are respectively encapsulated on the substrate at intervals by different plastic encapsulation bodies and electrically connected to the circuit board through the substrate.
[0009] Furthermore, the encapsulating body for encapsulating the conductive component has a window on one side wall along the second direction, and the tab connection portion is located at the window and exposed outside the encapsulating body.
[0010] Furthermore, the portion of the tab connection exposed outside the molding module extends along the first direction, so that the conductive element and the portion of the tab connection exposed outside the molding module are connected in an L-shape or a T-shape.
[0011] Furthermore, the portion of the electrode connecting part exposed through the window has a dimension of not less than 0.5 mm along the width direction of the electrode.
[0012] Furthermore, the portion of the electrode connecting part exposed through the window portion along the length direction of the electrode is not less than 1 mm.
[0013] The second aspect of this utility model provides a battery, including a battery cell and a battery protection board as described in any of the above claims disposed at the head of the battery cell.
[0014] Furthermore, the battery also includes an adhesive structure located between the head of the battery cell and the circuit board, wherein the circuit board is bonded to the head of the battery cell via the adhesive structure.
[0015] Furthermore, the battery cells are arranged in multiple rows, and the circuit board is provided with the molding module at the position opposite to each battery cell. The tab of each battery cell is electrically connected to the conductive part of the opposite molding module.
[0016] Furthermore, the circuit board is bent at the joint of two adjacent battery cells to form a clearance space for accommodating the side seals of the two battery cells.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: The battery protection board provided by this utility model includes a circuit board and a molding compound module. The molding compound module is disposed on one side of the circuit board and electrically connected to the circuit board. The molding compound module integrates conductive components, so that when the molding compound module is disposed on the circuit board and electrically connected to the circuit board, the conductive components also form an electrical connection with the circuit board. A tab connection portion is formed on one side of the conductive component in a second direction, which is the width direction of the circuit board. The tab connection portion extends along the thickness direction of the circuit board, and the tab connection portion protrudes from the molding compound module on one side along the second direction, so that the tab connection portion can be attached to and electrically connected to the tab of the battery cell, thereby realizing the electrical connection between the battery cell and the battery protection board.
[0018] Therefore, when assembling the battery protection board with the battery cell, the circuit board of the battery protection board can be placed parallel to the head of the battery cell. Simultaneously, the tabs extending along the length of the battery cell are positioned on one side of the circuit board's width direction, facing the tab connection portion exposed from the plastic-encapsulated module for electrical connection, such as through soldering. This shifts the connection position between the tabs and the circuit board from one side of the circuit board's thickness direction to one side of its width direction, avoiding the tabs occupying space along the battery's length between the circuit board and the battery cell. This reduces the assembly distance between the circuit board and the battery cell head along the battery's length, thus creating conditions for increasing battery capacity. Attached Figure Description
[0019] 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.
[0020] Figure 1 This is a schematic diagram of the structure of the battery protection board provided in an embodiment of the present utility model; Figure 2 A schematic diagram of the battery protection board and battery cell provided in an embodiment of this utility model from a first-view perspective; Figure 3 A schematic diagram of the battery protection board and battery cell provided in an embodiment of this utility model from a second perspective; Figure 4 This is a schematic diagram of the assembly of the battery protection board and multiple battery cells provided in an embodiment of the present invention.
[0021] Figure label: 1-Circuit board, 11-Adhesive structure, 12-Clearing space, 2-Molded module, 21-Substrate, 22-Molded body, 23-Electronic components, 24-Window opening, 25-Electrical tab connection, 3-Battery cell, 31-Electrical tab, 32-Side sealing edge; a - First direction, b - Second direction. Detailed Implementation
[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0023] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.
[0024] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0025] 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.
[0026] 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.
[0027] The following reference Figures 1 to 4 This application describes a battery protection board and a battery according to some embodiments.
[0028] The first aspect of this application provides a battery protection board, such as Figures 1 to 3As shown, the battery protection board includes a circuit board 1 and a molding compound module 2. The molding compound module 2 is disposed on one side of the circuit board 1 along the first direction a (i.e., the thickness direction of the circuit board 1), and a conductive component is encapsulated inside the molding compound module 2. The conductive component is electrically connected to the circuit board 1. A tab connection portion 25 is formed on one side of the conductive component along the second direction b. The second direction b is perpendicular to the first direction a and is the width direction of the circuit board 1. The tab connection portion 25 extends along the thickness direction of the circuit board 1, and the tab connection portion 25 is exposed on the side of the molding compound module 2 along the second direction b, so that the tab connection portion 25 can be attached to and electrically connected to the tab 31 of the battery cell 3, thereby realizing the electrical connection between the battery cell 3 and the battery protection board.
[0029] Therefore, when assembling the battery protection board with the battery cell 3, the circuit board 1 of the battery protection board can be placed parallel to the head of the battery cell 3, with the molding module 2 located on the side of the circuit board 1 away from the battery cell 3. Simultaneously, the tab 31 extending along the length of the battery cell 3 is positioned on the side of the circuit board 1 in the second direction b, and is electrically connected to the tab connection portion 25 exposed by the molding module 2, for example, by soldering. This shifts the connection position of the tab 31 to the circuit board 1 from the thickness direction to the width direction, avoiding the tab 31 occupying space in the length direction of the battery between the circuit board 1 and the battery cell 3. This reduces the assembly distance between the circuit board 1 and the head of the battery cell 3 in the length direction, thus creating conditions for increasing battery capacity.
[0030] In this embodiment, preferably, the molding module 2 includes a substrate 21, an electronic device 23, and a molding compound 22. The substrate 21 is placed on one side of the circuit board 1 and electrically connected to the circuit board 1. The electronic device 23 and the conductive component are encapsulated on the side of the substrate 21 away from the circuit board 1 through the same molding compound 22. Both the electronic device 23 and the conductive component are electrically connected to the substrate 21 so as to be electrically connected to the circuit board 1 through the substrate 21. Alternatively, the electronic device 23 and the conductive component are encapsulated on the substrate at intervals through different molding compounds 22 and electrically connected to the circuit board through the substrate 21.
[0031] Preferably, the electronic device 23 and the conductive component are encapsulated within the same encapsulation body 22.
[0032] Alternatively, electronic device 23 is encapsulated on a circuit board by one plastic encapsulation, and conductive component is encapsulated on a circuit board by another plastic encapsulation, so that electronic device and conductive component are encapsulated on the substrate at intervals through different plastic encapsulations.
[0033] In this embodiment, preferably, when the molding module 2 is encapsulated using the molding body 22, the conductive component and the tab connection portion 25 are both encapsulated inside the molding body 22. Then, a portion of the sidewall of the molding body 22 along the second direction b, specifically the sidewall opposite to the tab connection portion 25, is removed, forming a window portion 24 on the sidewall of the molding body 22. The tab connection portion 25 is exposed through the window portion 24, so that the conductive component can be electrically connected to the tab 31 of the battery cell 3 through the tab connection portion 25. The position of the tab connection portion 25 and the battery cell 3 is transferred to the side of the molding module 2 along the second direction b, which is also the side of the battery protection board along the second direction.
[0034] Alternatively, when using the molding compound 22 for encapsulation, the tab connection portion 25 may not be encapsulated, allowing the tab connection portion 25 to be directly exposed to the outside of the molding compound 22.
[0035] Regarding the connection form between the conductive element and the tab connection portion 25, in this embodiment, preferably, the conductive element and the tab connection portion 25 are connected in an L-shape or in a T-shape.
[0036] Specifically, the conductive element is placed parallel to one side of the substrate 21, and the other side of the substrate 21 is placed parallel to the circuit board 1. When the tab connection 25 is connected to the conductive element in an L-shape, one side of the tab connection 25 is connected to one side of the conductive element along the second direction b, and the other side of the tab connection 25 extends toward the side of the substrate 21 away from the circuit board 1. At the same time, the tab connection 25 and the sidewall of the circuit board 1 in the second direction b are parallel to each other, so that when the battery protection board and the tab 31 of the cell 3 are assembled, the tab 31 can be parallel to the tab connection 25 for electrical connection.
[0037] When the tab connection 25 is connected to the conductive element in a T-shape, the conductive element is still placed parallel on the side of the substrate 21 away from the circuit board 1. One side of the conductive element in the second direction b is perpendicularly connected to the middle of the tab connection 25. The tab connection 25 extends along the thickness direction of the circuit board 1 to the sidewall of the substrate 21 in the second direction b, and extends in the direction away from the circuit board 1. The tab connection 25 is parallel to the sidewall of the circuit board 1 in the second direction b. This allows the tab connection 25 to be parallel and attached to the tab 31 of the battery cell 3 for electrical connection. It also increases the length of the tab connection 25 to a certain extent, thereby increasing the contact area between the tab connection 25 and the tab 31 and improving the connection stability.
[0038] In this embodiment, preferably, the portion of the tab connection 25 exposed through the window 24 has a predetermined width along the width direction of the tab 31, and this width is not less than 0.5 mm; for example, the width of the exposed area of the tab connection 25 is 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, etc. More preferably, the width of the exposed area of the tab connection 25 is not greater than 1.6 mm. This ensures that the tab connection 25 and the tab 31 have sufficient contact area in the width direction of the tab 31 for connection, thereby ensuring the stability of the connection.
[0039] Preferably, the portion of the tab connection 25 exposed through the window 24 has a predetermined length along the length direction of the tab 31, and this length is not less than 1 mm; for example, the length of the exposed area of the tab connection 25 is 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. More preferably, the length of the exposed area of the tab connection 25 is not greater than 8 mm. This ensures that the tab connection 25 and the tab 31 have sufficient contact area along the length direction of the tab 31 for connection, thereby ensuring the stability of the connection.
[0040] It should be noted that, in this application, the tab 31 at one end of the battery cell 3 extends along the length direction of the battery cell 3, which is the thickness direction of the circuit board 1, and its width direction extends along the width direction of the battery cell 3.
[0041] In this embodiment, preferably, for a single cell 3 battery, the tab 31 of the cell 3 typically includes a positive tab 31 and a negative tab 31. Correspondingly, the conductive component integrated in the molding module 2 also includes a positive conductive component and a negative conductive component, so that the positive tab 31 is electrically connected to the tab connection portion 25 of the positive conductive component, and the negative tab 31 is electrically connected to the tab connection portion 25 of the negative conductive component.
[0042] A second aspect of this application provides a battery, including a cell and a battery protection board of any of the above embodiments disposed at the head of the cell.
[0043] In this embodiment, the battery includes a battery protection board, and therefore the battery has all the beneficial effects of the battery protection board, which will not be described in detail here.
[0044] In this embodiment, preferably, the battery also includes an adhesive structure 11, through which the circuit board 1 is bonded to the head of the cell 3. Since the connection position between the circuit board 1 and the tab 31 is moved out from between the circuit board 1 and the cell 3, the circuit board 1 can be directly bonded to the head of the cell 3 through the adhesive structure 11. Thus, under a given battery size, the length of the cell 3 can be extended, so that the battery capacity can be increased.
[0045] In this embodiment, preferably, as follows: Figure 4As shown, there are multiple (including two) battery cells 3, and multiple battery cells 3 are arranged side by side; for example, multiple battery cells 3 are arranged side by side along their own width direction, so that the side seals of two adjacent battery cells 3 are in contact.
[0046] For a battery with multiple cells 3, multiple plastic encapsulation modules 2 are arranged on the circuit board 1, so that the multiple plastic encapsulation modules 2 correspond one-to-one with the multiple cells 3, and the tabs 31 of each cell 3 are connected to the tab connection part 25 exposed on the corresponding plastic encapsulation module 2.
[0047] More preferably, such as Figure 4 As shown, the circuit board 1 is bent at the joint of any two adjacent battery cells 3 to form a clearance space 12, which is used to accommodate the side sealing edge 32 of the two battery cells 3, so that the circuit board can be placed at the head of multiple battery cells.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A battery protection board, characterized in that, Includes circuit boards and plastic-encapsulated modules; The molding module has a conductive component encapsulated inside, and the molding module is electrically connected to one side of the circuit board along a first direction through one end of the conductive component. A tab connection portion is formed on one side of the conductive component. The encapsulation module exposes the tab connection portion along the second direction of the circuit board so that the tab connection portion is electrically connected to the tab of the battery cell. The second direction is the width direction of the circuit board, and the first direction is perpendicular to the second direction.
2. The battery protection board according to claim 1, characterized in that, The encapsulated module includes a substrate, electronic components, and an encapsulated body; The electronic device and the conductive component are encapsulated on the substrate through the same molding compound and electrically connected to the circuit board through the substrate. Alternatively, the conductive element and the electronic device are respectively encapsulated on the substrate at intervals by different plastic encapsulation bodies and electrically connected to the circuit board through the substrate.
3. The battery protection board according to claim 2, characterized in that, The encapsulation body for encapsulating the conductive component has a window on one side wall along the second direction, and the electrode connection portion is located at the window and exposed outside the encapsulation body.
4. The battery protection board according to claim 1, characterized in that, The portion of the tab connection exposed outside the encapsulated module extends along the first direction, such that the conductive element and the portion of the tab connection exposed outside the encapsulated module are connected in an L-shape or a T-shape.
5. The battery protection board according to claim 3, characterized in that, The portion of the electrode tab connection exposed through the window has a width of not less than 0.5 mm along the width direction of the electrode tab.
6. The battery protection board according to claim 3, characterized in that, The portion of the electrode connecting part exposed through the window has a dimension of not less than 1 mm along the length of the electrode.
7. A battery, characterized in that, Includes a battery cell and a battery protection board as described in any one of claims 1 to 6 disposed at the head of the battery cell.
8. The battery according to claim 7, characterized in that, The battery also includes an adhesive structure located between the head of the battery cell and the circuit board, wherein the circuit board is bonded to the head of the battery cell via the adhesive structure.
9. The battery according to claim 7, characterized in that, The battery cells are arranged in multiple rows, and the circuit board is provided with the molding module at the position opposite to each battery cell. The tab of each battery cell is electrically connected to the conductive part of the opposite molding module.
10. The battery according to claim 9, characterized in that, The circuit board is bent at the joint of two adjacent battery cells to form a clearance space for accommodating the side seals of the two battery cells.