Battery protection plate and battery assembly
By dividing the pad area on the rigid circuit board and setting up circuit branches to distribute current and signal terminals, the problem of the difficulty in connecting the flexible circuit board and the rigid circuit board in the battery protection board is solved, and a larger output current is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNWODA ELECTRONICS CO LTD
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-17
AI Technical Summary
The large output current required to achieve a battery protection board makes the electrical connection between its flexible circuit board and rigid circuit board quite difficult.
The pad area on the rigid circuit board is divided into first and second pad areas arranged at intervals. The current terminals and signal terminals on the flexible circuit board are distributed by setting line branches so that they can be electrically connected to the pad areas on the rigid circuit board respectively, while increasing the size of the current terminals.
It reduces the difficulty of electrical connection between flexible and rigid circuit boards and increases the output current of the battery protection board.
Smart Images
Figure CN224139205U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of battery protection board design technology, specifically relating to a battery protection board and a battery assembly. Background Technology
[0002] With the development of battery technology, the demand for battery power is gradually increasing. To ensure that the battery has a sufficiently large output current to meet the power demand, in practical applications, the battery protection board is formed by a rigid printed circuit board (PCB) and a flexible printed circuit board (FPC). The size of the flexible printed circuit board is getting larger and larger to achieve a larger output current. However, the size of the rigid printed circuit board and the position of the electrode connection area on the rigid printed circuit board are usually fixed. As the size of the flexible printed circuit board increases, the soldering difficulty between the flexible printed circuit board and the rigid printed circuit board also increases. Utility Model Content
[0003] The purpose of this application is to provide a battery protection board and battery assembly that can solve the problem that the current battery protection board has difficulty in electrically connecting its flexible circuit board and rigid circuit board due to the large output current.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows:
[0005] In a first aspect, embodiments of this application provide a battery protection board, including a rigid circuit board and a flexible circuit board. The rigid circuit board has a first pad area and a second pad area arranged at intervals. The flexible circuit board includes a connected circuit board body and a circuit branch. One of the circuit board body and the circuit branch is provided with a current terminal, and the other is provided with a signal terminal. The current terminal is electrically connected to the first pad area, and the signal terminal is electrically connected to the second pad area.
[0006] Secondly, embodiments of this application also provide a battery assembly, including a battery cell and the aforementioned battery protection board, wherein the rigid circuit board of the battery protection board is electrically connected to the battery cell.
[0007] In this embodiment, the rigid circuit board has a first pad area and a second pad area arranged at intervals. The flexible circuit board includes a connected circuit board body and circuit branches. One of the circuit board body and the circuit branches is provided with a current terminal, and the other is provided with a signal terminal. The current terminal is electrically connected to the first pad area, and the signal terminal is electrically connected to the second pad area. Compared with the prior art that centrally arranges the current terminals and signal terminals on the flexible circuit board, this solution divides the pad areas corresponding to the current terminals and signal terminals on the rigid circuit board into a first pad area and a second pad area, and arranges them at intervals. Then, by setting circuit branches, the current terminals and signal terminals on the flexible circuit board are distributed. At this time, the circuit branches can be flexibly arranged on the rigid circuit board, so that the current terminals and signal terminals can be electrically connected to the first pad area and the second pad area on the rigid circuit board respectively, thereby reducing the difficulty of electrical connection between the flexible circuit board and the rigid circuit board. At the same time, the size of the current terminal can be increased, thereby increasing the output current of the battery protection board. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the structure of the battery protection board disclosed in the embodiments of this application;
[0009] Figure 2 This is a schematic diagram of the rigid circuit board structure disclosed in the embodiments of this application;
[0010] Figure 3 This is a schematic diagram of the structure of the flexible circuit board disclosed in the embodiments of this application;
[0011] Figure 4 This is a schematic diagram of the battery assembly structure disclosed in the embodiments of this application;
[0012] Explanation of reference numerals in the attached figures:
[0013] 100 - Rigid circuit board, 110 - First pad area, 111 - First pad, 112 - Second pad, 120 - Second pad area, 121 - Signal pad, 130 - First tab connection area, 140 - Second tab connection area;
[0014] 200-Flexible circuit board, 210-Circuit board body, 211-Current terminal, 211a-Avoidance opening, 211b-Positive terminal, 211c-Negative terminal, 212-Soldering part, 213-Main body, 214-Connector, 220-Circuit branch, 221-Signal terminal, 222-First board segment, 223-Second board segment, 224-Third board segment, 225-Connecting protrusion;
[0015] 310 - Battery cell, 311 - Tab, 320 - Battery protection board. Detailed Implementation
[0016] 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.
[0017] 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.
[0018] The battery protection board and battery assembly provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.
[0019] like Figures 1 to 3 As shown in the figure, this application embodiment provides a battery protection board, which includes a rigid circuit board 100 and a flexible circuit board 200. The flexible circuit board 200 features high integration, thinness, and flexibility, while the rigid circuit board 100 features high rigidity, good bending resistance, high reliability, and long service life. Optionally, at least one of the rigid circuit board 100 and the flexible circuit board 200 may be provided with functional devices. These functional devices may specifically be control ICs, MOS switches, resistors, capacitors, and auxiliary devices (NTC temperature sensors, ID memory, etc.). This application embodiment does not impose specific limitations on this.
[0020] The rigid circuit board 100 has a first pad area 110 and a second pad area 120 arranged at intervals. The flexible circuit board 200 includes a circuit board body 210 and a circuit branch 220 connected to each other. One of the circuit board body 210 and the circuit branch 220 is provided with a current terminal 211 and the other is provided with a signal terminal 221. The current terminal 211 is electrically connected to the first pad area 110 to transmit current, and the signal terminal 221 is electrically connected to the second pad area 120 to transmit signals.
[0021] In this embodiment, compared to the prior art which centrally arranges the current terminals 211 and signal terminals 221 on the flexible circuit board 200, this scheme divides the pad areas corresponding to the current terminals 211 and signal terminals 221 on the rigid circuit board 100 into a first pad area 110 and a second pad area 120, and arranges them at intervals. Then, by setting line branches 220, the current terminals 211 and signal terminals 221 on the flexible circuit board 200 are distributed. At this time, the line branches 220 can be flexibly arranged on the rigid circuit board 100 so that the current terminals 211 and signal terminals 221 can be electrically connected to the first pad area 110 and the second pad area 120 on the rigid circuit board 100, respectively, thereby reducing the difficulty of electrical connection between the flexible circuit board 200 and the rigid circuit board 100. At the same time, when the current terminals 211 and signal terminals 221 are distributed, the size of the current terminals 211 can be increased, thereby increasing the output current of the battery protection board. Therefore, the embodiments of this application can solve the problem that the current battery protection board has great difficulty in electrical connection between its flexible circuit board 200 and rigid circuit board 100 due to the large output current.
[0022] In an optional embodiment, the rigid circuit board 100 further includes a first tab connection area 130 and a second tab connection area 140. Optionally, each tab connection area may be provided with an adapter nickel sheet. The first tab connection area 130 and the second tab connection area 140 are both used for electrical connection with the tab 311 of the battery cell 310. Since the tab 311 is usually made of aluminum and the rigid circuit board 100 is usually made of copper, it is not easy to apply solder when copper and aluminum are directly soldered. Therefore, by setting the first tab connection area 130 and the second tab connection area 140, direct contact between copper and aluminum is avoided, thereby facilitating a stable connection between the tab 311 and the rigid circuit board 100.
[0023] The first tab connection area 130 and the second tab connection area 140 are arranged at intervals along the length of the rigid circuit board 100. Along the length of the rigid circuit board 100, the first pad area 110 and the second pad area 120 are located on opposite sides of the first tab connection area 130. The second pad area 120 and the second tab connection area 140 are arranged at intervals along the width of the rigid circuit board 100. In this arrangement, the second pad area 120 avoids occupying extra space along the length of the rigid circuit board 100, and the greater distance between the first pad area 110 and the second pad area 120 prevents interference between the circuit branch 220 and the circuit board body 210, thus further facilitating the installation of the flexible circuit board 200. Alternatively, the second pad area 120 can also be arranged at intervals along the width of the rigid circuit board 100 with the first tab connection area 130.
[0024] In a further optional embodiment, the rigid circuit board 100 has a first edge and a second edge facing away from each other in its width direction. The first tab connection area 130 is located on the side of the circuit stub 220 near the first edge, and the second tab connection area 140 is located on the side of the circuit stub 220 near the second edge. That is, the first tab connection area 130 and the second tab connection area 140 are located on different sides of the circuit stub 220, which facilitates the electrical connection of the tabs 311 of adjacent cells 310 (adjacent cells 310 are located on both sides of the rigid circuit board 100 in the width direction) with the first tab connection area 130 and the second tab connection area 140, respectively. Of course, the first tab connection area 130 and the second tab connection area 140 can also both be located on the same side of the circuit stub 220.
[0025] Optionally, the circuit stub 220 passes between the first tab connection area 130 and the second tab connection area 140. Specifically, the circuit stub 220 includes a first board segment 222, a second board segment 223, and a third board segment 224 connected in sequence. The first board segment 222 is connected to the circuit board body 210. The second board segment 223 is bent relative to the first board segment 222, and the third board segment 224 is bent relative to the second board segment 223. The extension direction of the second board segment 223 is parallel to the width direction of the rigid circuit board 100. The first board segment 222 and the third board segment 224 extend in opposite directions in the width direction of the second board segment 223. The second board segment 223 is located between the first tab connection area 130 and the second tab connection area 140. In the width direction of the rigid circuit board 100, the first tab connection area 130 and the first board segment 222 are arranged side by side, and the second tab connection area 140 and the third board segment 224 are arranged side by side.
[0026] Optionally, there are two of the first tab connection area 130 and the second tab connection area 140, including a positive connection area and a negative connection area arranged at intervals along the length of the rigid circuit board 100; each cell 310 has two tabs 311, including a positive tab and a negative tab, with the positive tab electrically connected to the positive connection area and the negative tab electrically connected to the negative connection area.
[0027] In another optional embodiment, the current terminal 211 is soldered to the first pad area 110, and the signal terminal 221 is soldered to the second pad area 120, so that the current terminal 211 is electrically connected to the first pad area 110, and the signal terminal 221 is electrically connected to the second pad area 120. Optionally, the solder can be solder paste, or other types of solder, and this embodiment does not impose specific limitations on this. Both the current terminal 211 and the signal terminal 221 are provided with clearance openings 211a, which are used to avoid solder, so that some solder overflows through the clearance openings 211a to the side of the flexible circuit board 200 away from the rigid circuit board 100. During the soldering process, the solder initially has a certain degree of fluidity. The solder between the current terminal 211 and the first pad area 110, and between the signal terminal 221 and the second pad area 120, overflows through the clearance opening 211a to the side of the flexible circuit board 200 facing away from the rigid circuit board 100. After the solder solidifies, the portion of the solder on the side of the flexible circuit board 200 facing away from the rigid circuit board 100 can play a positioning role, and the contact area between the flexible circuit board 200 and the solder is relatively large, which helps to improve the connection stability between the flexible circuit board 200 and the rigid circuit board 100. Of course, the clearance opening 211a can also be omitted.
[0028] Optionally, the clearance opening 211a can be a circular structure or a U-shaped structure, and this application embodiment does not impose specific limitations on this.
[0029] In another optional embodiment, the current terminal 211 is disposed on the circuit board body 210, the signal terminal 221 is disposed on the circuit stub 220, and the first pad area 110 is located at the first end of the rigid circuit board 100, and the first pad area 110 extends along the width direction of the rigid circuit board 100. Since the first end of the rigid circuit board 100 has a larger space, when the current terminal 211 is arranged at the first end of the rigid circuit board 100, the size of the current terminal 211 can be further increased, thereby further increasing the output current of the battery protection board. Of course, the current terminal 211 can also be disposed on the circuit stub 220.
[0030] In a further optional embodiment, in the thickness direction of the rigid circuit board 100, the orthographic projection of the circuit stub 220 lies within the orthographic projection of the rigid circuit board 100. In this case, the circuit stub 220 is completely supported on the rigid circuit board 100, thereby improving the stability of the circuit stub 220. Of course, in the thickness direction of the rigid circuit board 100, a portion of the orthographic projection of the circuit stub 220 may also lie outside the orthographic projection of the rigid circuit board 100.
[0031] Optionally, the first pad area 110 is provided with a first pad 111 and a second pad 112 spaced apart along the width direction of the rigid circuit board 100. The current terminal 211 includes a positive terminal 211b and a negative terminal 211c. The positive terminal 211b is electrically connected to the first pad 111, and the negative terminal 211c is electrically connected to the second pad 112. Optionally, the positive terminal 211b is connected to the first pad 111 by soldering to achieve electrical connection. A portion of the circuit board body 210 is located on one side of the rigid circuit board 100 in its width direction. In this case, this portion of the circuit board body 210 can be stacked with the battery cell 310, thereby avoiding occupying a large additional space in the length direction of the rigid circuit board 100 and reducing the volume of the battery assembly. Optionally, the negative terminal 211c is connected to the second pad 112 by soldering to achieve electrical connection. Of course, the portion of the circuit board body 210 located on one side of the rigid circuit board 100 in its width direction can also be located on one side of the rigid circuit board 100 in its length direction.
[0032] Optionally, the circuit board body 210 includes a soldering portion 212, a main body portion 213, and a connector 214 connected in sequence. The first end of the circuit branch 220 is electrically connected to the soldering portion 212. A current terminal 211 is disposed on the soldering portion 212. In the width direction of the rigid circuit board 100, at least a portion of the main body portion 213 is located on one side of the rigid circuit board 100. The connector 214 is used to electrically connect to an external structure, thereby transmitting current from the battery assembly to the external structure to power the external structure.
[0033] In an optional embodiment, at least two signal pads 121 are provided in the second pad area 120, spaced apart along the length of the rigid circuit board 100; signal terminals 221 are disposed at the second end of the circuit branch 220, and there are at least two signal terminals 221. Each signal terminal 221 is spaced apart along the length of the rigid circuit board 100, and each signal terminal 221 is electrically connected to each signal pad 121 in a one-to-one correspondence. Optionally, each signal terminal 221 and each signal pad 121 are connected by soldering, so that each signal terminal 221 is electrically connected to each signal pad 121 in a one-to-one correspondence. In this scheme, the multiple signal pads 121 and multiple signal terminals 221 are spaced apart along the length of the rigid circuit board 100, which can reduce the space occupied in the width direction of the rigid circuit board 100, thereby reducing the difficulty of arranging each signal terminal 221 and each signal pad 121. Of course, multiple signal pads 121 and multiple signal terminals 221 can also be arranged at intervals along the width direction of the rigid circuit board 100.
[0034] Optionally, the number of signal terminals 221 can be at least four, including signal terminals DAT, PRS, CLK, and PRES. Of course, it can also be adjusted according to actual needs, and this application embodiment does not impose specific limitations on this.
[0035] In a further optional embodiment, the second end of the circuit stub 220 is provided with at least two connecting protrusions 225 spaced apart along the length direction of the rigid circuit board 100. Each signal terminal 221 is correspondingly disposed on each connecting protrusion 225. This not only increases the isolation between adjacent signal terminals 221, but also facilitates the one-to-one correspondence between each signal terminal 221 and each signal pad 121 during the assembly of the flexible circuit board 200 and the rigid circuit board 100, thereby improving assembly efficiency. Of course, the connecting protrusions 225 may not be provided.
[0036] In an embodiment where the circuit stub 220 includes a first board segment 222, a second board segment 223, and a third board segment 224 connected in sequence, at least two signal pads 121 are provided in the second pad area 120, spaced apart along the length of the rigid circuit board 100; signal terminals 221 are provided in the third board segment 224 of the circuit stub 220, and there are at least two signal terminals 221. Each signal terminal 221 is spaced apart along the length of the rigid circuit board 100, and each signal terminal 221 is electrically connected to each signal pad 121 in a one-to-one correspondence. The third board segment 224 is provided with at least two connecting protrusions 225 spaced apart along the length of the rigid circuit board 100. Each signal terminal 221 is correspondingly provided in each connecting protrusion 225. Each connecting protrusion 225 is close to the second edge of the rigid circuit board 100, that is, each connecting protrusion 225 is located at the end of the third board segment 224 away from the second tab connection area 140, thereby facilitating the arrangement of the tabs 311.
[0037] like Figure 4 As shown, based on the battery protection board disclosed in the embodiments of this application, the embodiments of this application also disclose a battery assembly, which includes a battery cell 310 and a battery protection board 320 as described in any of the above embodiments, wherein the rigid circuit board 100 of the battery protection board 320 is electrically connected to the battery cell 310.
[0038] In an optional embodiment, the rigid circuit board 100 further includes a first tab connection area 130 and a second tab connection area 140. The rigid circuit board 100 has a first edge and a second edge facing away from each other in its width direction. The first tab connection area 130 is located on the side of the circuit branch 220 near the first edge, and the second tab connection area 140 is located on the side of the circuit branch 220 near the second edge. In the width direction of the rigid circuit board 100, battery cells 310 are provided on both sides facing away from each other. The tab 311 of the battery cell 310 located on the first side of the rigid circuit board 100 is electrically connected to the first tab connection area 130, and the tab 311 of the battery cell 310 located on the second side of the rigid circuit board 100 is electrically connected to the second tab connection area 140.
[0039] In the above scheme, each battery cell 310 and the rigid circuit board 100 are located in the same plane. In the width direction of the rigid circuit board 100, the rigid circuit board 100 is positioned between adjacent battery cells 310. This facilitates the electrical connection between the tab 311 of the battery cell 310 located on the first side of the rigid circuit board 100 and the first tab connection area 130 on the rigid circuit board 100, and the electrical connection between the tab 311 of the battery cell 310 located on the second side of the rigid circuit board 100 and the second tab connection area 140 on the rigid circuit board 100. Of course, the two battery cells 310 can also be stacked.
[0040] Optionally, there are two of the first tab connection area 130 and the second tab connection area 140, including a positive connection area and a negative connection area arranged at intervals along the length of the rigid circuit board 100; each cell 310 has two tabs 311, including a positive tab and a negative tab, with the positive tab electrically connected to the positive connection area and the negative tab electrically connected to the negative connection area.
[0041] 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 protection plate, characterized in that, The circuit includes a rigid circuit board (100) and a flexible circuit board (200). The rigid circuit board (100) has a first pad area (110) and a second pad area (120) arranged at intervals. The flexible circuit board (200) includes a connected circuit board body (210) and a circuit branch (220). One of the circuit board body (210) and the circuit branch (220) is provided with a current terminal (211) and the other is provided with a signal terminal (221). The current terminal (211) is electrically connected to the first pad area (110) and the signal terminal (221) is electrically connected to the second pad area (120).
2. The battery protection plate of claim 1, wherein, The rigid circuit board (100) also has a first tab connection area (130) and a second tab connection area (140), both of which are used for electrical connection with the tabs (311) of the battery cell (310). The first tab connection area (130) and the second tab connection area (140) are arranged at intervals along the length direction of the rigid circuit board (100). In the length direction of the rigid circuit board (100), the first pad area (110) and the second pad area (120) are located on opposite sides of the first tab connection area (130), and the second pad area (120) and the second tab connection area (140) are arranged at intervals along the width direction of the rigid circuit board (100).
3. The battery protection plate of claim 2, wherein, The rigid circuit board (100) has a first edge and a second edge opposite to each other in its width direction, the first tab connection area (130) is located on the side of the circuit stub (220) near the first edge, and the second tab connection area (140) is located on the side of the circuit stub (220) near the second edge. The line branch (220) passes between the first tab connection area (130) and the second tab connection area (140).
4. The battery protection plate of claim 1, wherein, The current terminal (211) is soldered to the first pad area (110), and the signal terminal (221) is soldered to the second pad area (120) so that the current terminal (211) is electrically connected to the first pad area (110), and the signal terminal (221) is electrically connected to the second pad area (120). Both the current terminal (211) and the signal terminal (221) are provided with a clearance opening (211a) to allow the solder to pass through the clearance opening (211a) and overflow to the side of the flexible circuit board (200) away from the rigid circuit board (100).
5. The battery protection plate of claim 1, wherein, The current terminal (211) is disposed on the circuit board body (210), the signal terminal (221) is disposed on the circuit branch (220), the first pad area (110) is located at the first end of the rigid circuit board (100), and the first pad area (110) extends along the width direction of the rigid circuit board (100).
6. The battery protection plate of claim 5, wherein, In the thickness direction of the rigid circuit board (100), the orthographic projection of the circuit stub (220) lies within the orthographic projection of the rigid circuit board (100). The first pad area (110) is provided with a first pad (111) and a second pad (112) arranged at intervals along the width direction of the rigid circuit board (100). The current terminal (211) includes a positive terminal (211b) and a negative terminal (211c). The positive terminal (211b) is electrically connected to the first pad (111), and the negative terminal (211c) is electrically connected to the second pad (112). A portion of the circuit board body (210) is located on one side of the rigid circuit board (100) in its width direction.
7. The battery protection plate of claim 1, wherein, The second pad area (120) is provided with at least two signal pads (121) arranged at intervals along the length direction of the rigid circuit board (100). The signal terminal (221) is disposed at the second end of the line branch (220). There are at least two signal terminals (221). Each signal terminal (221) is arranged at intervals along the length direction of the rigid circuit board (100). Each signal terminal (221) is electrically connected to each signal pad 121 in a one-to-one correspondence.
8. The battery protection plate of claim 7, wherein, The second end of the line branch (220) is provided with at least two connecting protrusions (225) arranged at intervals along the length direction of the rigid circuit board (100), and each of the signal terminals (221) is correspondingly provided on each of the connecting protrusions (225).
9. A battery assembly characterized by, The battery includes a battery cell (310) and a battery protection board (320) according to any one of claims 1 to 8, wherein the rigid circuit board (100) of the battery protection board (320) is electrically connected to the battery cell (310).
10. The battery protection plate of claim 9, wherein, The rigid circuit board (100) also has a first tab connection area (130) and a second tab connection area (140). The rigid circuit board (100) has a first edge and a second edge opposite to each other in its width direction. The first tab connection area (130) is located on the side of the circuit stub (220) near the first edge, and the second tab connection area (140) is located on the side of the circuit stub (220) near the second edge. In the width direction of the rigid circuit board (100), the battery cell (310) is provided on both opposite sides of the rigid circuit board (100). The tab (311) of the battery cell (310) located on the first side of the rigid circuit board (100) is electrically connected to the first tab connection area (130), and the tab (311) of the battery cell (310) located on the second side of the rigid circuit board (100) is electrically connected to the second tab connection area (140).