A battery protection board, a battery, and a terminal

Abstract

The present disclosure relates to a battery protection board, a battery, and a terminal. The battery protection board includes a connector for connecting battery cells, including an access board, a first shunt board, a first connection board, and a second connection board. The first shunt board shunts current on the access board of the battery protection board, reducing excess current and thereby reducing the size of the battery protection board and the overall battery volume. Alternatively, the board can carry higher currents while maintaining the same size, allowing for larger battery cells to provide more power.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and in particular to a battery protection board, a battery, and a terminal. Background Art

[0002] During the use of lithium batteries, overcharging, over-discharging, short circuiting, and overcurrent can affect the battery's lifespan and performance. In severe cases, they can cause combustion or explosion. Therefore, every lithium battery must be equipped with a battery protection board. This board, consisting of an IC chip and several components, effectively monitors and prevents damage to the battery through a protection loop, preventing dangers such as combustion and explosion caused by overcharging, over-discharging, and short circuiting.

[0003] The battery protection board provides overcurrent, overvoltage, and temperature protection. The two poles of the battery cell are connected to the two poles of the connector through the battery protection board. The two poles of the connector are used to connect to external devices for charging and discharging. Because the battery protection board needs to pass the same current as the battery cell, the greater the current passing through, the larger the battery protection board is required, and the more space the battery protection board occupies. As the space occupied by the battery protection board increases, the space for the battery cell decreases accordingly, while the overall space of the battery assembly remains constant, resulting in a smaller overall battery capacity. Summary of the Invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a battery protection board, a battery and a terminal.

[0005] According to a first aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a battery protection board for connecting a battery cell to a connector, the battery protection board comprising: an access board, a first shunt board, a first connecting board and a second connecting board; wherein the access board comprises: a first contact point, the first contact point being arranged at one end of the access board, and being connected to the first pole of the connector of the connector through the first connecting board; a second contact point, the second contact point being arranged at the other end of the access board opposite to the first contact point, and being connected to the second pole of the connector of the connector through the second connecting board; a first access point, the first access point being arranged at the first access point and The second connection point is used to connect to the first pole of the battery cell; and the second connection point is set between the first connection point and the second connection point, and is used to connect to the second pole of the battery cell; the first shunt plate includes: a first shunt access end, located at one end of the first shunt plate, connected to the first access point of the access plate, or connected between the first access point and the second access point of the access plate; and a first shunt connection end, located at the other end of the first shunt plate opposite to the first shunt access end, connected to the electrical path between the second access point of the access plate and the second pole of the connector.

[0006] In one embodiment, the first branch outlet is connected to the second outlet point of the access board, or is connected between the second access point and the second outlet point of the access board.

[0007] In one embodiment, the first branch outlet is connected to the second connection plate.

[0008] In one embodiment, the first diverter plate and the second connecting plate are integrally formed.

[0009] In one embodiment, the first diverter plate further includes a branch plate, and the branch plate connects the first diverter access end with the first connecting plate.

[0010] In one embodiment, the first diverter plate and the first connecting plate are integrally formed.

[0011] In one embodiment, the first branch outlet is connected to the second connection plate.

[0012] In one embodiment, the first diverter plate, the first connecting plate, and the second connecting plate are integrally formed.

[0013] In one embodiment, the first manifold plate, the first connecting plate, and the second connecting plate are integrally formed into a flexible circuit board.

[0014] In one embodiment, the battery protection board further includes: a second shunt board; the second shunt board includes: a second shunt access end, located at one end of the second shunt board, connected to the second access point of the access board, or connected between the first access point and the second access point of the access board; a second shunt output end, located at the other end of the second shunt board opposite to the first shunt access end, connected to the electrical path between the first access point of the access board and the first pole of the connector.

[0015] In one embodiment, the first diverter plate, the first connecting plate, and the second connecting plate are all connected to the access plate by welding.

[0016] In one embodiment, the battery protection board further includes: a protection circuit, which is arranged on the access board, and the protection circuit includes: a protection circuit chip, a MOS switch, and a thermistor.

[0017] In one embodiment, the first electrode of the battery cell is a positive electrode, and the second electrode of the battery cell is a negative electrode.

[0018] According to a second aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a battery, comprising: a connector, the connector comprising a first connector pole and a second connector pole, for outputting or inputting current; a battery cell, the battery cell comprising a first cell pole and a second cell pole; a battery protection board as described in the first aspect, the battery protection board connecting the first cell pole with the first connector pole, and connecting the second cell pole with the second connector pole.

[0019] According to a third aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a terminal, which includes the battery as described in the second aspect, for providing power.

[0020] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the current on the access plate of the battery protection plate is shunted by the first shunt plate, reducing the overcurrent, thereby reducing the size of the battery protection plate and reducing the total volume of the battery; or it can carry a higher current without changing the size, so that a larger battery cell can be used to provide more power.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] Figure 1FIG. 1 is a schematic diagram of a battery protection board according to a related art according to an exemplary embodiment.

[0024] Figure 2 FIG. 1 is a schematic diagram of a battery protection board according to another related technology according to an exemplary embodiment.

[0025] Figure 3 A schematic structural diagram of a battery protection board according to an embodiment of the present disclosure is shown.

[0026] Figure 4 A schematic structural diagram of a battery protection board according to another embodiment of the present disclosure is shown.

[0027] Figure 5 A schematic structural diagram of a battery protection board according to another embodiment of the present disclosure is shown.

[0028] Figure 6 A schematic structural diagram of a battery protection board according to another embodiment of the present disclosure is shown.

[0029] Figure 7 A circuit diagram of a protection circuit according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0031] It should be noted that although the expressions "first" and "second" are used herein to describe different modules, steps, and data in the embodiments of the present disclosure, the expressions "first" and "second" are merely intended to distinguish between different modules, steps, and data, and do not indicate a specific order or importance. In fact, the expressions "first" and "second" are completely interchangeable.

[0032] In some conventional schemes, such as Figure 1As shown, the two poles of the battery cell 20 are welded to the battery protection board 10, and the two ends of the battery protection board 10 are connected to the two poles of the connector 30. The battery protection board 10 is equipped with a protection circuit to protect the battery cell 20 from overcharging, overdischarging, short circuit, overcurrent, etc. In this structure, the main body of the battery protection board 10 needs to pass a positive current of 1 / 2 and a negative current of 1 / 2, assuming a total current of 1. Therefore, the battery protection board 10 needs to be wide to ensure that it can carry this current, which takes up a large space and compresses the space available for the battery cell 20.

[0033] In some related technologies, such as Figure 2 As shown, in order to reduce current concentration, a U-shaped nickel sheet 11 is provided in the battery protection board 10. The nickel sheet 11 is connected to the positive electrode of the battery cell 20 by welding. The two ends of the U-shaped nickel sheet 11 are welded to the access plate (hard plate) 12 of the battery protection board 10 to form a shunt. The negative electrode of the battery cell 20 is directly welded to the access plate 12. The two ends of the access plate 12 are respectively welded to the connecting plate 13, respectively connecting the two poles of the connector 30. However, using this method, welding through the nickel sheet 11 has poor integrity. The structure of the three components of the battery cell 20, nickel sheet 11, and access plate 12 is complex. In addition, due to the structural relationship of the nickel sheet 11, the risk of breakage and short circuit during falling is also relatively high.

[0034] In order to solve the above technical problems, an embodiment of the present disclosure provides a battery protection board 40 for connecting a battery cell 50 with a connector, and the first pole 51 of the battery cell 50 is connected to the first pole 61 of the connector, and the second pole 52 of the battery cell is connected to the second pole 62 of the connector through the battery protection board, and the battery cell 50 is protected by a protection circuit arranged on the battery protection board 40.

[0035] The first electrode 51 of the battery cell can be either a positive electrode or a negative electrode, and the corresponding second electrode 52 of the battery cell has the opposite polarity to the first electrode 51 of the battery cell, and can be either a negative electrode or a positive electrode. Corresponding to the positive and negative polarity of the first electrode 51 and the second electrode 52 of the battery cell, the first electrode 61 of the connector has the same polarity as the first electrode 51 of the battery cell, and the second electrode 62 of the connector has the same polarity as the second electrode 52 of the battery cell. Since most current protection circuits use a negative low-voltage circuit for protection, this disclosure uses the example of the first electrode 51 of the battery cell being a positive electrode and the second electrode 52 of the battery cell being a negative electrode.

[0036] like Figure 3 、 Figure 4 、 Figure 5 As shown, the battery protection board 40 may include: an access board 41 , a first shunt board 42 , a first connecting board 43 and a second connecting board 44 .

[0037] The access board 41 is provided with a first access point 411, a first access point 413, a second access point 414, and a second access point 412 arranged in sequence from one end to the other. The first access point 411, the first access point 413, the second access point 414, and the second access point 412 may not be independent components, but may be locations connected to other components, or may be welding points connected by welding.

[0038] The first contact point 411 is provided at one end of the access plate 41 , and may be close to the end, and may be connected to the first connection plate 43 by welding or other means, and connected to the first connector pole 61 of the connector through the first connection plate 43 .

[0039] The second connection point 412 is set at the other end of the access plate 41 opposite to the first connection point 411, and can be close to the end. It can be connected to the second connecting plate 44 by welding or other means, and connected to the second connector pole 62 of the connector through the second connecting plate 44.

[0040] The first access point 413 is disposed between the first outlet point 411 and the second outlet point 412 and can be connected to the first pole 51 of the battery cell 50 by welding or other means, so that the first pole 51 of the battery cell is connected to the first pole 61 of the connector via the first access point 413, the access plate 41 between the first access point 413 and the first outlet point 411, and the first connecting plate 43 connecting the first outlet point 411 and the first pole 61 of the connector, thereby forming an electrical path from the first pole 51 of the battery cell to the first pole 61 of the connector.

[0041] The second access point 414 is disposed between the first access point 413 and the second outlet point 412 and can be connected to the second pole 52 of the battery cell 50 by welding or other means. The second pole 52 of the battery cell is connected to the second pole 62 of the connector via the second access point 414, the access plate 41 between the second access point 414 and the second outlet point 413, and the second connecting plate 44 connecting the second outlet point 413 and the second pole 62 of the connector, thereby forming an electrical path from the second pole 52 of the battery cell to the second pole 62 of the connector.

[0042] The first diverter plate 42 can be a soft board or a portion of a flexible circuit board. In some cases, it can be integrally formed with one or both of the first connecting plate 43 and the second connecting plate 44. The first diverter plate 42 includes a first diverter inlet port 421 and a first diverter outlet port 422. The first diverter inlet port 421 and the first diverter outlet port 422 may not be separate components, but rather serve as connections to other components or soldered joints.

[0043] The first diversion access end 421 is located at one end of the first diversion plate 42. Figure 3 As shown, it can be connected to the first access point 413 of the access board 41, or as shown in FIG. Figure 4 As shown, it is connected between the first access point 413 and the second access point 414 of the access board 41.

[0044] The first shunt outlet 422 is located at the other end of the first shunt plate 42 opposite to the first shunt inlet 421 , and is connected to the electrical path between the second access point 414 of the access plate 41 and the second pole 62 of the connector.

[0045] In the above embodiment, by adding the first shunt plate 42, the positive electrode is divided into two sides of I / 2 for a circuit with a total current of I. At the same time, the negative electrode is divided into left and right, and the current on both sides is divided into I / 2. That is, for the main part of the access plate 41, the current is changed from the positive current of I / 2 and the negative current of I / 2 in the above conventional scheme. With the change to the negative current of I / 2, the total passing current is reduced by half, and the total width of the corresponding access plate 41 and the battery protection plate 10 will also be greatly reduced. The current passing through the superimposed first shunt plate 42 will be folded back to the surface of the battery cell 50, folded back above or below the battery cell 50, and will not occupy additional battery length, thereby increasing the space of the battery cell 50 and increasing the capacity of the battery. The first shunt plate 42, the first connecting plate 43 and the second connecting plate 44 can be a soft-hard combination plate or a welded plate.

[0046] In one embodiment, if Figure 3 As shown, the first shunt outlet 422 can be connected between the second access point 414 and the second outlet 412 of the access board 41. This approach can shunt the current on the access board 41 to a certain extent, reducing the total current on the access board 41, thereby reducing the size of the access board 41 without significantly increasing the size of the first shunt board 42.

[0047] In another embodiment, the first shunt outlet 422 can be connected to the second outlet point 412 of the access board 41. Compared with the previous embodiment, the first shunt outlet 422 is closer to the end of the access board 41, thereby further reducing the total current on the access board 41.

[0048] In one embodiment, the first shunt outlet 422 is connected to the second connecting plate 44. Compared to the previous embodiment, this connection method directly connects the first shunt plate 42 to the second connecting plate 44. By increasing the size of the first shunt plate 42, it can further reduce the current on the access plate 41, thereby allowing the access plate 41 to be further reduced in size or carry a higher current without changing its size. In this embodiment, the first shunt plate 42 and the second connecting plate 44 can be welded or integrally formed.

[0049] In one embodiment, if Figure 5As shown, the first diverter plate 42 further includes a branch plate 423, which connects the first diverter access terminal 421 to the first connecting plate 43. In this embodiment, the electrical path connecting the access plate 41 to the first pole 61 of the connector is further diverted, further reducing the current load of the access plate 41.

[0050] In one embodiment, based on the previous embodiment, the first shunt outlet end 422 of the first shunt plate 42 can be arranged in a manner of being directly connected to the second connecting plate 44, that is, the first shunt access end 421 of the first shunt plate 42 is connected to the access plate 41, and the first shunt plate 42 forms two branches. One branch is formed by connecting the first shunt outlet end 422 to the second connecting plate 44, and is an electrical path from the first shunt access end 421 to the first shunt outlet end 422, and is connected to the second pole 62 of the connector through the second connecting plate 44. The other branch is formed by connecting the first connecting plate 43 through the branch plate 423, and is an electrical path from the first shunt access end 421 through the branch plate 423 to the first connecting plate 43, and is connected to the first pole 61 of the connector through the first connecting plate 43. In this embodiment, the current flow rate of all circuits is reduced from 1 to 1 / 2. Not only is the space at the access plate 41 reduced, but the circuit formed by the first shunt plate 42, the first connecting plate 43, and the second connecting plate 44 also has a uniform current flow rate of 1 / 2 due to the interconnected electrical path, thereby reducing circuit load. In this embodiment, the branch plate 423 of the first shunt plate 42 and the first connecting plate 43 can be connected by welding or integrally formed.

[0051] In the above embodiment, the first diverter plate 42, the first connecting plate 43, and the second connecting plate 44 can be connected to each other by welding or can be integrally formed. In one embodiment, the first diverter plate 42, the first connecting plate 43, and the second connecting plate 44 can be integrally formed using a flexible printed circuit (FPC). This allows for flow diversion for the access plate 41, reduces space occupied, and facilitates molding and installation.

[0052] In one embodiment, if Figure 6As shown, the battery protection board 40 may also include: a second shunt plate 45, which is independent of the first shunt plate 42, to shunt the current on the access board 41. The second shunt plate 45 includes: a second shunt inlet end 451, located at one end of the second shunt plate 45, connected to the second access point 414 of the access board 41, or connected between the first access point 413 and the second access point 414 of the access board 41; a second shunt outlet end 452, located at the other end of the second shunt plate 45 opposite the first shunt inlet end 451, connected to the electrical path between the first access point 413 of the access board 41 and the first pole 61 of the connector. In this embodiment, the second shunt plate 45 and the first shunt plate 42 can be arranged correspondingly. The second shunt outlet end 452 can be connected to the access board 41 between the first access point 413 and the first outlet point 411, or directly connected to the first outlet point 411. It can also be directly connected to the first connection board 43 by welding or integral molding. Another shunt branch independent of the first shunt plate 42 is formed by the second shunt plate 45 , thereby reducing the current load on the access plate 41 and reducing the occupied space.

[0053] In the embodiment of the present disclosure, the battery protection board 40 further includes a protection circuit 70, which can be provided on the access board 41. Figure 7 The circuit diagram of a protection circuit is shown as an example, but the circuit structure of the protection circuit can be in many ways, and the protection circuit used on the battery protection board 40 of the present disclosure is not limited to this one way. Figure 7 As shown, the protection circuit 70 may include: a protection circuit chip 71, one or more MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) switches, and a thermistor. B+ is connected to the positive electrode of the battery cell, B- is connected to the negative electrode of the battery cell, P+ is connected to the positive output of the battery protection board 40, and P- is connected to the negative output of the battery protection board 40. The protection circuit 70 protects the battery cell from overcharging, overdischarging, overcurrent, abnormal temperature, and other conditions.

[0054] Figure 7 The illustrated embodiment includes two MOS switches: a first MOS switch 72 and a second MOS switch 73. In a normal state, CO and DO of the protection circuit chip 71 both output high voltages, and both MOS switches are in the open state, so that the battery cells can be charged and discharged freely.

[0055] Figure 7 In the embodiment, the protection circuit 70 may further include components such as a capacitor 74 and a resistor 75.

[0056] in, Figure 7The thermistors shown include a positive temperature coefficient (PTC) thermistor 76 and a negative temperature coefficient (NTC) thermistor 77. When the ambient temperature rises, their resistance decreases, allowing the electrical device or charging device to react promptly, controlling internal interruptions and stopping charging and discharging.

[0057] During the charging process, when the protection circuit chip 71 detects that the battery voltage reaches the overcharge protection threshold, the CO pin outputs a low level, the second MOS switch 73 turns from on to off, the charging circuit is shut down, and the charger can no longer charge the battery, thereby achieving overcharge protection.

[0058] During discharge, when the protection circuit chip 71 detects that the battery voltage is below the over-discharge protection threshold, the DO pin transitions from a high level to a low level, closing the first MOS switch 72 and preventing further battery discharge, thus implementing over-discharge protection. In the over-discharge protection state, the battery voltage cannot drop further, requiring the protection circuit to draw extremely low current, and the control circuit enters a low-power mode.

[0059] Under normal circumstances, the battery discharges the load, and the current flows through the two series-connected first and second MOS switches 72 and 73. The VM pin detects a voltage drop across the two MOS switches, which is U. If the load causes U to become abnormal due to some reason, the loop current increases. When U exceeds a certain value, the DO pin switches from a high voltage to a low voltage, turning off the first MOS switch 72 and reducing the discharge loop current to zero, thus achieving overcurrent protection.

[0060] Based on the same inventive concept, the disclosed embodiments further provide a battery, comprising: a connector, the connector comprising a first connector pole and a second connector pole, for outputting or inputting current; a battery cell, the battery cell comprising a first cell pole and a second cell pole; and a battery protection board 40 according to any of the aforementioned embodiments, the battery protection board 40 connecting the first cell pole to the first connector pole, and connecting the second cell pole to the second connector pole. The battery protection board 40 of the aforementioned embodiments can protect the battery cell while reducing its own size, thereby saving space, allowing the battery cell to have a larger volume and a greater battery capacity. Alternatively, the volume of the entire battery can be reduced while maintaining the original capacity.

[0061] Based on the same concept, embodiments of the present disclosure also provide a terminal. The terminal can be an electronic product such as a mobile phone, a laptop computer, or a device requiring battery power, such as an electric car. The terminal includes one or more batteries according to the aforementioned embodiments. By adopting the batteries according to the aforementioned embodiments, the battery size can be reduced while maintaining a constant charge within the limited space of the terminal, thereby miniaturizing the terminal or freeing up space for other components.

[0062] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0063] It will be further understood that the terms "first," "second," and the like are used to describe various types of information, but such information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another and do not indicate a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information without departing from the scope of this disclosure.

[0064] It can be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0065] It is further understood that, unless otherwise specified, “connection” includes a direct connection where there are no other components between the two elements, and also includes an indirect connection where there are other elements between the two elements.

[0066] It is further understood that although operations are described in a particular order in the drawings in the embodiments of the present disclosure, this should not be construed as requiring that the operations be performed in the particular order shown or in a serial order, or that all of the operations shown be performed to obtain the desired results. In certain circumstances, multitasking and parallel processing may be advantageous.

[0067] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0068] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A battery protection board, characterized in that: The battery protection board is used to connect the battery cell and the connector, and the battery protection board includes: an access board, a first shunt board, a first connecting board and a second connecting board; wherein, The access board includes: a first connection point, the first connection point being provided at one end of the access plate and connected to the first connector pole of the connector through the first connection plate; a second connection point, the second connection point being provided at the other end of the access board opposite to the first connection point and connected to the second pole of the connector of the connector through the second connection plate; A first access point, the first access point being disposed between the first access point and the second access point and being configured to be connected to a first electrode of the battery cell; and a second access point, the second access point being arranged between the first access point and the second output point, and being configured to be connected to the second pole of the battery cell; The first diverter plate comprises: a first diversion access end, located at one end of the first diversion plate, connected to the first access point of the access plate, or connected between the first access point and the second access point of the access plate; and A first diversion outlet is located at the other end of the first diversion plate opposite to the first diversion inlet, and is connected to the second connection plate; a branch plate, connecting the first branch access end and the first connecting plate; The first shunt plate, the first connecting plate, and the second connecting plate integrally form a flexible circuit board, and the first shunt plate is folded back to the surface of the battery cell.

2. The battery protection board according to claim 1, characterized in that: The battery protection board further includes: a second shunt plate; The second diverter plate comprises: a second diversion access end, located at one end of the second diversion plate, connected to the second access point of the access plate, or connected between the first access point and the second access point of the access plate; The second shunt outlet is located at the other end of the second shunt plate opposite to the first shunt inlet, and is connected to the electrical path between the first access point of the access plate and the first pole of the connector.

3. The battery protection board according to claim 1, characterized in that: The first diverter plate, the first connecting plate, and the second connecting plate are all connected to the access plate by welding.

4. The battery protection board according to claim 1, characterized in that: The battery protection board also includes: The protection circuit is arranged on the access board, and the protection circuit includes: a protection circuit chip, a MOS switch, and a thermistor.

5. The battery protection board according to claim 1, characterized in that: The first electrode of the battery cell is a positive electrode, and the second electrode of the battery cell is a negative electrode.

6. A battery, characterized in that: The battery comprises: The connector includes a first connector pole and a second connector pole, and is used for outputting or inputting current; A battery cell, wherein the battery cell comprises a first cell pole and a second cell pole; The battery protection board according to any one of claims 1 to 5, wherein the battery protection board connects the first pole of the battery cell to the first pole of the connector, and connects the second pole of the battery cell to the second pole of the connector.

7. A terminal, characterized in that: The terminal includes the battery as claimed in claim 6 for providing power.

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