Lithium battery protection plate and lithium battery

Abstract

The utility model relates to battery technical field discloses a kind of lithium battery protection plate and lithium battery, lithium battery protection plate includes: PCB, electric core connecting sheet, switching device, device upper metal cover, output soft board, PCB is used to connect with electric core, electric core connecting sheet, switching device, device upper metal cover and output soft board are connected with PCB, electric core connecting sheet, switching device, device upper metal cover and output soft board are layered and stacked along the thickness direction of PCB, so that current path is perpendicular transmission along the thickness direction of PCB, without detour, reach the purpose that line resistance is reduced, realize the technical effect that battery charging efficiency is significantly increased, solve the problem that the charging efficiency of battery protection plate in prior art is difficult to improve.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a lithium battery protection board and a lithium battery. Background Technology

[0002] With the rapid development of fast charging technology in mobile phones, the energy density and charging power of lithium batteries are constantly improving. However, the performance improvement of the battery protection board (PCM, Power Control Module) is severely constrained by its size and space. Inside ultra-thin mobile phones, the protection board is limited to a very small space, resulting in a highly compact circuit layout, complex wiring, and long loops. The current path from the cell input terminal to the connection terminal of the protection board motherboard has a large line resistance, which not only increases energy loss but also causes significant voltage drop and heat generation under the high current conditions of fast charging. This physical limitation makes it difficult for the protection board to integrate MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) with larger current capacity and more precise control circuits, thus limiting the improvement of charging efficiency. At the same time, the high-specification components and complex multi-layer PCB (Printed Circuit Board) designs that must be used to cope with high-power fast charging significantly increase the cost of the protection board. More importantly, the internal resistance caused by long traces will exacerbate voltage sampling errors, affecting the protection board's accurate monitoring of battery status, thus hindering the further development of fast charging technology. Utility Model Content

[0003] In view of this, the present invention provides a lithium battery protection board and a lithium battery to solve the problem that the charging efficiency of the battery protection board in the prior art is difficult to improve.

[0004] In a first aspect, this utility model provides a lithium battery protection board. The lithium battery protection board includes: a PCB, a cell connecting piece, a switching device, a metal cover on the device, and an output flexible board. The PCB is used to connect with the cell. The cell connecting piece, the switching device, the metal cover on the device, and the output flexible board are connected to the PCB. The cell connecting piece, the switching device, the metal cover on the device, and the output flexible board are stacked in layers along the thickness direction of the PCB.

[0005] By stacking the cell connectors, switching devices, metal covers on the devices, and output flexible circuit boards in layers along the thickness direction of the PCB, the contact areas between the cell connectors and the PCB, the contact areas between the switching devices and the metal covers on the devices, and the contact areas between the switching devices and the output flexible circuit boards are not limited by the planar space of the PCB. This allows the width and thickness of the cell connectors and output flexible circuit boards to be increased, resulting in a larger cross-sectional area. At the same time, the current path is transmitted perpendicularly along the thickness direction of the PCB without detours, achieving the goal of reducing the internal resistance of the circuit. This results in a significant increase in battery charging efficiency and solves the problem of difficulty in improving the charging efficiency of battery protection boards in existing technologies.

[0006] In one alternative implementation, the battery cell connector is located on one side of the PCB, while the switching device, the metal cover on the device, and the output flexible circuit board are located on the other side of the PCB. The positions of the battery cell connector, switching device, metal cover on the device, and output flexible circuit board are correspondingly arranged. By distributing the components to both sides of the PCB, the number of components and the area occupied on each side are reduced, avoiding the space congestion caused by the need to arrange large-sized components such as battery cell connectors, switching devices, and output flexible circuit boards on the same surface of the PCB in traditional single-sided layouts.

[0007] In one optional implementation, the PCB has N layers, where N = 2n, and n ≥ 2. An even number of layers in the PCB avoids misalignment of component connection points on both sides due to asymmetrical layer count, which can lead to poor contact. This ensures the positional accuracy of components during assembly and reduces the risk of cold solder joints and connection failures. In one optional implementation, an integrated component is provided within the PCB. The integrated component, along with the battery cell connector, switching device, metal cover on the device, and output flexible circuit board, are stacked in layers. The integrated component includes at least one of a current conveyor and a current detector, which can simultaneously transmit current and detect the magnitude of current.

[0008] In one alternative implementation, multiple electronic components can be stacked between the metal cover on the device and the PCB, significantly reducing the planar area occupied by the PCB10.

[0009] In one optional embodiment, the cell connecting piece includes a positive connecting piece and a negative connecting piece, the output flexible board includes a positive output flexible board and a negative output flexible board, and the positive connecting piece, switching device, metal cover on the device, positive output flexible board and PCB are stacked in layers, and / or the negative connecting piece, switching device, metal cover on the device, negative output flexible board and PCB are stacked in layers, which shortens the current transmission distance.

[0010] In one alternative implementation, one end of the positive output flexible circuit board and the negative output flexible circuit board are connected to the PCB, and the orientation of the other end of the positive output flexible circuit board and the negative output flexible circuit board can be varied, thereby improving the versatility of the battery protection board.

[0011] Secondly, this utility model also provides a lithium battery, including a battery cell and a lithium battery protection board connected to the battery cell, wherein the lithium battery protection board is the lithium battery protection board of the above embodiment.

[0012] Since lithium batteries include lithium battery protection boards, which have the same effect as lithium battery protection boards, they will not be elaborated on here.

[0013] In one alternative implementation, the PCB is vertically positioned on top of the battery cell, with the positive electrode connector connected to the positive terminal and the negative electrode connector connected to the negative terminal, thus avoiding occupying the stacking space of the battery cells.

[0014] In one alternative implementation, the PCB is attached to the sidewall of the battery cell, which can make full use of the unused space. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the structure of a lithium battery protection board according to an embodiment of the present utility model; Figure 2 This is an exploded structural diagram of a lithium battery protection board according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of another lithium battery according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the exploded structure of a lithium battery according to another embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 10. PCB; 20. Cell connecting piece; 21. Positive electrode connecting piece; 22. Negative electrode connecting piece; 30. Switching devices; 40. Metal cover on the device; 50. Output flexible circuit board; 51. Positive output flexible circuit board; 52. Negative output flexible circuit board; 60. Integrated components; 100. Battery cells. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0022] It should be noted that the charging principle of lithium batteries is to apply a direct current (DC) voltage higher than the current voltage of the battery to an external power source, driving lithium ions from the positive electrode material (such as...) The lithium dendrites are extracted and migrated through the electrolyte to the negative electrode (such as graphite) and embedded in its layered structure. At the same time, electrons flow to the negative electrode through the external circuit, completing the conversion of electrical energy into chemical energy. The battery protection board PCM (Power Control Module) plays a key regulatory role in this process: its built-in dedicated IC (Integrated Circuit) monitors the battery voltage, current and temperature in real time. When overvoltage (such as exceeding 4.25V), overcurrent (such as exceeding 1C rated current) or high temperature (such as >45℃) is detected, it controls the MOSFET switch (Metal-Oxide-Semiconductor Field-Effect Transistor) to cut off the charging circuit, preventing lithium dendrite growth or electrolyte decomposition. At the same time, the PCM's equalization circuit adjusts the voltage difference of multiple battery cells (usually within ±20mV) to ensure charging consistency.

[0023] In related technologies, components on battery protection boards often adopt a planar layout. Components on the PCB (Printed Circuit Board) surface need to avoid other structures. The width or thickness of connecting pieces (such as cell connecting pieces and output flexible boards) is often limited by the planar space, resulting in a compressed path cross-sectional area. Moreover, in a planar layout, the current needs to start from the cell connection point, bypass other components on the PCB surface to reach the switching device, and then detour to the output terminal. The increased path length leads to a proportional increase in the line resistance. At the same time, Ohm's law (R=ρL / A) dictates that the longer the current path (L) and the smaller the conductor cross-sectional area (A), the greater the resistance. In other words, the compact layout forces the traces to detour and narrow the line width, which significantly increases the copper foil resistance, thereby reducing charging efficiency.

[0024] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a lithium battery protection board is provided. The lithium battery protection board includes: a PCB 10, a cell connecting piece 20, a switching device 30, a metal cover 40 on the device, and an output flexible board 50. The PCB 10 is used to connect to the cell. The cell connecting piece 20, the switching device 30, the metal cover 40 on the device, and the output flexible board 50 are connected to the PCB 10. The cell connecting piece 20, the switching device 30, the metal cover 40 on the device, and the output flexible board 50 are stacked in layers along the thickness direction of the PCB 10.

[0026] In this embodiment, by stacking the cell connecting piece 20, the switching device 30, the metal cover 40 on the device, and the output flexible board 50 in layers along the thickness direction of the PCB 10, the contact area between the cell connecting piece 20 and the PCB 10, the contact area between the switching device 30 and the metal cover 40 on the device, and the contact area between the switching device 30 and the output flexible board 50 are not limited by the planar space of the PCB. This allows the cell connecting piece 20 and the output flexible board 50 to adaptably increase their width and thickness, thereby having a larger path cross-sectional area. At the same time, the current path is transmitted perpendicularly along the thickness direction of the PCB without detours, achieving the purpose of reducing the internal resistance of the line. This achieves the technical effect of significantly increasing the battery charging efficiency and solves the problem that the charging efficiency of the battery protection board is difficult to improve in the prior art.

[0027] In one embodiment, the cell connecting piece 20 is disposed on one side of the PCB10, and the switching device 30, the device upper metal cover 40, and the output flexible board 50 are located on the other side of the PCB10. The positions of the cell connecting piece 20, the switching device 30, the device upper metal cover 40, and the output flexible board 50 are correspondingly arranged.

[0028] Specifically, by distributing the components to both sides of the PCB, the number of components and the area occupied on each side are reduced. This avoids the need for large components such as the battery cell connector 20, switching device 30, and output flexible board 50 to be arranged on the same surface of the PCB10 in the traditional single-sided layout, which leads to space congestion. This is especially true when the component size is large, such as the battery cell connector 20 needing sufficient area to ensure current flow and the switching device 30 needing reserved space for heat dissipation. This arrangement significantly reduces the overall size of the PCB10. At the same time, the corresponding positions of each component, such as the solder joints of the battery cell connector 20 and the pins of the switching device 30, whose projections on both sides of the PCB10 coincide, can be directly connected through short-distance vias without reserving space for "misaligned routing," further compressing the size of the PCB10.

[0029] Furthermore, the current transmission inside PCB10 is through metal vias. The components are stacked in layers, allowing the metal vias to penetrate the PCB vertically and directly connect to the corresponding solder joints of the components on both sides. This avoids the problem of the metal vias starting from the solder joints of the cell connector 20, extending a distance in the inner layer of PCB10, and then connecting to the switching device on the other side through the vias, which would increase the path length. This reduces the internal resistance of the circuits inside the PCB and improves the charging efficiency.

[0030] In one embodiment, the number of layers of PCB10 is N, where N = 2n, n ≥ 2.

[0031] In one embodiment, PCB10 can have 4 layers, 6 layers, or 8 layers, and so on. That is, the number of layers on the PCB board is an even number.

[0032] It should be noted that PCBs are made by laminating multiple layers of copper foil and insulating substrate. Each layer experiences stress at high temperatures due to differences in their coefficients of thermal expansion. Odd-layer PCBs, due to the asymmetrical number of material layers on both sides, suffer from stress imbalance, making them prone to warping. Even-layer PCBs, with symmetrical material distribution on both sides, allow stress to cancel each other out during thermal expansion and contraction, preventing warping. Furthermore, even-layer PCBs avoid the misalignment of component connection points caused by layer asymmetry, ensuring precise component placement during assembly and reducing the risk of cold solder joints and connection failures. In one embodiment, an integrated component 60 is provided in the PCB10. The integrated component 60 is stacked in layers with the cell connecting piece 20, the switching device 30, the device metal cover 40 and the output flexible board 50. The integrated component 60 includes at least one of a current filter and a current detector.

[0033] In one optional embodiment, the inner layer of PCB 10 may be provided with a current-carrying device. This current-carrying device, along with the battery cell connector 20, switching device 30, metal cover 40 on the device, and output flexible circuit board 50, are stacked in layers. The current-carrying device is used to transmit current, connect different circuit modules, and transmit electrical energy or high-current signals. Specifically, the current-carrying device can be the inner layer copper foil of the PCB. The inner layer copper foil can directly serve as a "detection carrier," specifically based on the resistivity of copper. Given the length and thickness of the copper foil, the current can be calculated by measuring the voltage U=IR across the copper foil. No additional detection components are required.

[0034] In another optional embodiment, the inner layer of PCB10 can simultaneously house a current-carrying device and a current-sensor. The current-carrying device, current-sensor, cell connector 20, switching device 30, metal cover 40 on the device, and output flexible circuit board 50 are stacked in layers. The current-sensor detects the magnitude of the current and converts changes in current into measurable electrical signals (such as voltage or resistance changes) to monitor the current state in the circuit (such as overcurrent, undercurrent, and current stability). Specifically, the current-sensor can be a shunt, a current sensor (Hall sensor, magnetoresistive sensor), a precision resistor, etc. Specifically, the inner copper layer (or current-carrying device) serves as the main current channel, vertically aligned with the cell connector 20 and switching device 30. The current-sensor is directly integrated into this inner layer or connected to the inner layer current-carrying device through vias, enabling simultaneous current carrying and detection.

[0035] In one embodiment, multiple electronic components may be stacked between the metal cover 40 on the device and the PCB 10.

[0036] Specifically, more components, such as resistors, capacitors, and small chips, can be accommodated in the vertical space between the metal cover 40 and the PCB 10, significantly reducing the planar area occupied by the PCB 10. Stacked components can reduce the length and routing of signal lines, thereby reducing signal transmission delay and interference.

[0037] In one embodiment, the cell connecting piece 20 includes a positive connecting piece 21 and a negative connecting piece 22, the output flexible board 50 includes a positive output flexible board 51 and a negative output flexible board 52, and the positive connecting piece 21, the switching device 30, the device upper metal cover 40, the positive output flexible board 51 and the PCB 10 are stacked in layers, and / or the negative connecting piece 22, the switching device 30, the device upper metal cover 40, the negative output flexible board 52 and the PCB 10 are stacked in layers.

[0038] Specifically, the layered stacking arrangement allows these components to be arranged compactly in the vertical direction, which significantly shortens the transmission distance of current from "cell → cell connector 20 → switching device 30 → output flexible board 50". The shortened path can directly reduce the loop resistance, reduce power loss and heat generation, improve energy conversion efficiency, and increase charging efficiency.

[0039] like Figure 1 , Figure 2 As shown, in this embodiment, the negative electrode connecting piece 22, the switching device 30, the metal cover 40 on the device, the negative electrode output flexible board 52, and the PCB 10 are stacked in layers. The positive electrode connecting piece 21 and the positive electrode output flexible board 51 are respectively connected to the two sides of the PCB 10, and there are no other components.

[0040] In other embodiments, the positive electrode connector 21, the switching device 30, the metal cover 40 on the device, the positive electrode output flexible board 51, and the PCB 10 can also be stacked in layers.

[0041] In one embodiment, one end of the positive output flexible board 51 and the negative output flexible board 52 are connected to the PCB 10, and the orientation of the other end of the positive output flexible board 51 and the negative output flexible board 52 can be set in a variable manner.

[0042] Specifically, the output flexible circuit board 50 is a flexible printed circuit board (FPC). Due to its flexibility and bendability, the orientation of the other ends of the positive output flexible circuit board 51 and the negative output flexible circuit board 52 can be adjusted according to actual needs (such as upward, downward, sideways, or bent at a certain angle), flexibly adapting to different connection objects and spatial layouts. For example, in a lithium battery module, the output flexible circuit board may need to be connected to the electrodes of the battery cell, an external charging interface, or a load terminal. The variable orientation improves the module's versatility.

[0043] like Figure 3 , Figure 4As shown, according to an embodiment of the present invention, another aspect provides a lithium battery, including a cell 100 and a lithium battery protection board connected to the cell, wherein the lithium battery protection board is the lithium battery protection board of the above embodiment.

[0044] By stacking the cell connecting piece 20, switching device 30, metal cover 40 on the device, and output flexible board 50 along the thickness direction of PCB10, the contact area between the cell connecting piece 20 and PCB10, the contact area between the switching device 30 and the metal cover 40 on the device, and the contact area between the switching device 30 and the output flexible board 50 are not limited by the planar space of the PCB. This allows the width and thickness of the cell connecting piece 20 and the output flexible board 50 to be increased adaptably, thus having a larger path cross-sectional area. At the same time, the current path is transmitted perpendicularly along the thickness direction of the PCB without detours, achieving the purpose of reducing the internal resistance of the line. This achieves the technical effect of significantly increasing the battery charging efficiency and solves the problem of difficulty in improving the charging efficiency of battery protection boards in the prior art.

[0045] In one embodiment, the PCB10 is vertically disposed on top of the battery cell 100, and the positive electrode connecting piece 21 is connected to the positive electrode post, and the negative electrode connecting piece 22 is connected to the negative electrode post. When the PCB10 is vertically disposed on top of the battery cell 100, the thickness direction of the PCB10 will not occupy the stacking space of the battery cell, which is especially suitable for thin devices (such as mobile phone batteries and tablet power modules).

[0046] In one embodiment, the PCB10 is attached to the sidewall of the battery cell 100. The sidewall of the battery cell is usually a large-area flat surface (especially the side of a cylindrical or square battery cell), and there may be gaps around it (such as the gaps after multiple battery cells are stacked). The PCB is attached to the sidewall to make full use of the idle space and there is no need to reserve an additional independent PCB mounting area.

[0047] According to an embodiment of the present invention, another aspect provides an electronic device, which includes a lithium battery, wherein the lithium battery is the lithium battery described in the above embodiment.

[0048] By stacking the cell connecting piece 20, switching device 30, metal cover 40 on the device, and output flexible board 50 along the thickness direction of PCB10, the contact area between the cell connecting piece 20 and PCB10, the contact area between the switching device 30 and the metal cover 40 on the device, and the contact area between the switching device 30 and the output flexible board 50 are not limited by the planar space of the PCB. This allows the width and thickness of the cell connecting piece 20 and the output flexible board 50 to be increased adaptably, thus having a larger path cross-sectional area. At the same time, the current path is transmitted perpendicularly along the thickness direction of the PCB without detours, achieving the purpose of reducing the internal resistance of the line. This achieves the technical effect of significantly increasing the battery charging efficiency and solves the problem of difficulty in improving the charging efficiency of battery protection boards in the prior art.

[0049] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0050] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0051] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lithium battery protection plate, characterized in that, include: PCB (10), cell connecting piece (20), switching device (30), device metal cover (40), output flexible board (50), the PCB (10) is used to connect with the cell, the cell connecting piece (20), the switching device (30), the device metal cover (40) and the output flexible board (50) are connected to the PCB (10), the cell connecting piece (20), the switching device (30), the device metal cover (40) and the output flexible board (50) are stacked in layers along the thickness direction of the PCB (10).

2. The lithium battery protection plate of claim 1, wherein, The cell connector (20) is disposed on one side of the PCB (10), the switch (30), the metal cover (40) on the device, and the output flexible board (50) are located on the other side of the PCB (10). The positions of the cell connector (20), the switch (30), the metal cover (40) on the device, and the output flexible board (50) are correspondingly arranged.

3. The lithium battery protection plate of claim 1, wherein, The PCB (10) has N layers, where N = 2n and n ≥ 2.

4. The lithium battery protection plate of claim 1, wherein, The PCB (10) is provided with an integrated component (60), which is stacked in layers with the battery cell connector (20), the switching device (30), the metal cover (40) on the device and the output flexible board (50). The integrated component (60) includes at least one of a current filter and a current detector.

5. The lithium battery protection plate of claim 1, wherein, Multiple electronic components can be stacked between the metal cover (40) on the device and the PCB (10).

6. The lithium battery protection plate of claim 1, wherein, The cell connector (20) includes a positive connector (21) and a negative connector (22), and the output flexible board (50) includes a positive output flexible board (51) and a negative output flexible board (52). The positive electrode connecting piece (21), the switching device (30), the metal cover on the device (40), the positive electrode output flexible board (51) and the PCB (10) are stacked in layers, and / or the negative electrode connecting piece (22), the switching device (30), the metal cover on the device (40), the negative electrode output flexible board (52) and the PCB (10) are stacked in layers.

7. The lithium battery protection plate of claim 6, wherein, One end of the positive output flexible board (51) and the negative output flexible board (52) are connected to the PCB (10), and the orientation of the other end of the positive output flexible board (51) and the negative output flexible board (52) can be varied.

8. A lithium battery, characterized by, include: Battery cell (100); A lithium battery protection board, wherein the lithium battery protection board is connected to the battery cell (100), and the lithium battery protection board is the lithium battery protection board according to any one of claims 1-7.

9. The lithium battery of claim 8, wherein, The PCB (10) is vertically disposed on the top of the battery cell (100), and the positive electrode connecting piece (21) is connected to the positive electrode post, and the negative electrode connecting piece (22) is connected to the negative electrode post.

10. The lithium battery of claim 8, wherein, The PCB (10) is attached to the side wall of the battery cell (100).

Images