CN217606986U - Charging protection device, battery and electronic equipment - Google Patents

Abstract

The application provides a charging protection device, including first utmost point ear, second utmost point ear and third utmost point ear, the second utmost point ear is anodal, and first utmost point ear and third utmost point ear are the negative pole, still includes first, second battery port and first, second switch unit. The first negative end of the first battery port is connected with the first lug, the first switch unit is connected between the first positive end of the first battery port and the second lug in series to form a first conductive path, the second switch unit is connected between the second positive end of the second battery port and the second lug in series, and the second negative end of the second battery port is connected with the third lug to form a second conductive path. The control unit is respectively connected with the first switch unit and the second switch unit so as to control the connection or disconnection of the first switch unit and the second switch unit. The application also provides a battery and an electronic device. Therefore, the problem of short circuit with the electronic equipment body caused by the non-insulation design of the metal shell of the battery can be avoided, and the non-insulation design can improve the capacity of the battery.

Description

Charging protection device, battery and electronic equipment

Technical Field

The present application relates to the field of batteries, and in particular, to a charging protection device, a battery, and an electronic apparatus.

Background

With the rapid development of the battery quick-charging technology, the requirement of high-power charging on the battery is higher and higher, and the requirement of temperature rise of the battery is as low as possible during large-current charging, which is a great challenge to the design of a charging protection device.

The existing quick charging design utilizes the advantages of a three-pole ear electric core, and can effectively shorten the charging path of a large current on a charging protection device, thereby reducing impedance and reducing heat generation. The specific implementation method is that two FPCs are arranged on the charging protection device and connected with a mobile phone system end, anodes of the two FPCs are respectively connected to an anode nickel sheet of the charging protection device through a shortest path, cathodes of the two FPCs are respectively connected with a switch MOS and then connected to a cathode nickel sheet of the charging protection device, and a charging and discharging loop is formed. Because the switch MOS of the charge-discharge loop is completely placed at the cathode of the battery cell, the charge-discharge loop is designed for low-end driving.

In the currently developed battery, because the metal casing of the battery cell has a negative polarity, and the electronic equipment cabin (i.e., the area where the battery is installed) is connected to the ground of the electronic equipment system, and the ground of the system has the negative polarity, the electronic equipment cabin itself also has the negative polarity, if the switch MOS of the charge-discharge loop is placed at the negative pole, the metal casing must be completely insulated, otherwise, the metal casing and the electronic equipment cabin are in contact short circuit, which is equivalent to the short circuit between the negative pole of the battery cell and the negative pole of the battery pack, the switch MOS of the protection circuit is also short-circuited, that is, the switch MOS cannot be turned off forever, the function of the protection circuit fails, and serious potential safety hazard is brought. If the metal shell is made into a full insulation scheme, the thickness of the battery cell is sacrificed, which means that the capacity of the battery cell is lost, the capacity of the battery cell cannot be maximized, and the market competitiveness of the product is lost.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art.

In order to solve the technical problem, the technical scheme of the application is as follows:

the first aspect of the application provides a charge protection device, which comprises a circuit board, a first conducting strip, a second conducting strip and a third conducting strip, wherein the first conducting strip, the second conducting strip and the third conducting strip are arranged on one side of the circuit board at intervals along a first direction, the first conducting strip and the third conducting strip are used for being in conductive connection with a first cover plate of an electric core to form a first lug and a third lug, the second conducting strip is used for being in conductive connection with a first rivet of the electric core to form a second lug, the first lug and the third lug are arranged on two sides of the second lug, the second lug is an anode, and the first lug and the third lug are cathodes; the charging protection device further comprises a first battery port and a second battery port, and the first battery port and the second battery port are arranged on the other side of the circuit board at intervals along the first direction; the charging protection device further comprises a first switch unit, a second switch unit and a control unit which are arranged adjacent to the second pole ear; a first negative end of the first battery port is connected with the first tab, and a first positive end of the first battery port is connected with the first switch unit and the second tab to form a first conductive path; a second positive terminal of the second battery port is connected with the second switch unit and the second tab, and a second negative terminal of the second battery port is connected with the third tab to form a second conductive path; the control unit is respectively connected with the first switch unit and the second switch unit and is used for controlling the connection or disconnection of the first switch unit and the second switch unit.

A second aspect of the present application provides a battery, including a first charge protection device, where the first charge protection device is the above-mentioned charge protection device, the battery further includes an electrical core, where the electrical core includes a metal casing, a first cover plate and a pole core assembly, where the metal casing has a first opening, the pole core assembly is disposed in an inner cavity of the metal casing, the first cover plate is covered on the first opening of the metal casing to seal the pole core assembly in the inner cavity of the metal casing, the electrical core further includes a first rivet disposed on one side of the metal casing away from the first cover plate, where the first rivet passes through the first cover plate and is connected with an anode of the pole core assembly, the first rivet is insulated from the first cover plate, a cathode of the pole core assembly is connected with the first cover plate, the first cover plate is further provided with a liquid injection hole penetrating through the first cover plate, and the liquid injection hole is used for injecting electrolyte into the inner cavity of the electrical core; first charge protection device include the circuit board with set up in first conducting strip, second conducting strip and third conducting strip on the circuit board, first conducting strip conductive connection is in near notes liquid hole on the first apron and form first utmost point ear, second conducting strip conductive connection is in on the first rivet and form the second utmost point ear, the third conducting strip conductive connection is in on the first apron and lie in the second utmost point ear is kept away from on one side of first utmost point ear, and form the third utmost point ear, the second utmost point ear is anodal, first utmost point ear with the third utmost point ear is the negative pole.

A third aspect of the present application provides an electronic device, including a battery and an electronic device body for accommodating the battery, the battery is the above battery, the battery at least includes a first battery port and a second battery port, and under the condition that the battery is fixed in the electronic device body, the first battery port and the second battery port are used for being electrically connected with corresponding ports in the electronic device body, respectively.

Compared with the prior art, the beneficial effect of this application lies in:

in this application, first switch unit sets up between second utmost point ear and first positive terminal, and second switch unit sets up between second utmost point ear and second positive terminal, promptly, and first switch unit and second switch unit all are located the anodal of electric core, realize high-end drive. The negative polarity of the metal shell and the first cover plate and the positive polarity of the first rivet of the battery cell can be well utilized by high-end driving, as long as the second conducting strip is insulated from the first rivet, a quick charging circuit driven by positive and negative poles can be realized, the problem of short circuit with an electronic equipment body caused by the non-insulating design of the metal shell of the battery cell can be effectively solved, and the capacity of the battery can be improved by the non-insulating design. Moreover, the control unit can control the first switch unit and the second switch unit to be switched on or off according to actual conditions, and the battery cell can be protected.

Drawings

Fig. 1 is a schematic structural diagram of a battery in a first embodiment of the present application.

Fig. 2 is a front view of a battery cell in a first embodiment of the present application.

Fig. 3 is a top view of a battery cell in the first embodiment of the present application.

Fig. 4 is a front view of a first charging protection device according to an embodiment of the present application.

Fig. 5 is a top view of a first charging protection device according to an embodiment of the present application.

Fig. 6 is a layout diagram of a first charging protection device according to an embodiment of the present application.

Fig. 7 is a circuit diagram of a first charge protection device according to an embodiment of the present application.

Fig. 8 is a front view of a battery cell in a second embodiment of the present application.

Fig. 9 is a top view of a battery cell in a second embodiment of the present application.

Fig. 10 is a schematic structural view of a battery in a second embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixedly connected and detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

The application provides a charge protection device, which comprises a circuit board, a first conducting plate, a second conducting plate and a third conducting plate, wherein the first conducting plate, the second conducting plate and the third conducting plate are arranged on one side of the circuit board at intervals along a first direction, the first conducting plate and the third conducting plate are used for being in conductive connection with a first cover plate of a battery cell to form a first lug and a third lug, the second conducting plate is used for being in conductive connection with a first rivet of the battery cell to form a second lug, the first lug and the third lug are arranged on two sides of the second lug, the second lug is an anode, and the first lug and the third lug are cathodes; the charging protection device further comprises a first battery port and a second battery port, and the first battery port and the second battery port are arranged on the other side of the circuit board at intervals along the first direction; the charging protection device further comprises a first switch unit, a second switch unit and a control unit which are arranged adjacent to the second pole ear; a first negative end of the first battery port is connected with the first tab, and a first positive end of the first battery port is connected with the first switch unit and the second tab to form a first conductive path; a second positive terminal of the second battery port is connected with the second switch unit and the second tab, and a second negative terminal of the second battery port is connected with the third tab to form a second conductive path; the control unit is respectively connected with the first switch unit and the second switch unit and is used for controlling the connection or disconnection of the first switch unit and the second switch unit.

Compared with the prior art, the beneficial effect of this application lies in:

in this application, first switch unit sets up between second utmost point ear and first positive terminal, and second switch unit sets up between second utmost point ear and second positive terminal, promptly, and first switch unit and second switch unit all are located the anodal of electric core, realize high-end drive. The negative polarity of the metal shell and the first cover plate which can be well utilized by high-end drive and the positive polarity of the first rivet of the battery cell can be well utilized, as long as the second conducting strip is insulated from the first rivet, a quick charging circuit driven by positive and negative poles can be realized, the problem of short circuit with an electronic equipment body caused by the non-insulation design of the metal shell of the battery cell can be effectively solved, and the capacity of the battery can be improved by the non-insulation design. Moreover, the control unit can control the first switch unit and the second switch unit to be switched on or off according to actual conditions, and the battery cell can be protected.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery in a first embodiment of the present application. The battery 1000 includes a battery cell 100 and a first charge protection device 200. The first charge protection device 200 is configured to protect the battery cell 100 from fast charge under a safe condition. It is understood that the battery 1000 also includes other components, which are not described in detail herein.

Referring to fig. 2 and fig. 3, fig. 2 is a front view of a battery cell in an embodiment of the present application; fig. 3 is a top view of a battery cell in an embodiment of the present application. The battery cell 100 includes a metal case 10, a first cover plate 20, and a pole core assembly (not shown). The metal case 10 has an inner cavity (not shown) and a first opening (not shown) communicating with the inner cavity. The pole core assembly is disposed in the internal cavity of the metal shell 10. The first cover plate 20 covers the first opening of the metal shell 10 to enclose the pole core assembly in the inner cavity of the metal shell 10. The battery cell 100 further includes a first rivet 30 disposed on a side of the first cover plate 20 away from the metal casing 10. The first rivet 30 is conductively connected to the positive pole of the pole body assembly through the first cover plate 20. The negative pole of the pole core assembly is conductively connected to the first cover plate 20. The first rivet 30 is insulated from the first cap plate 20. The first cover plate 20 is further provided with a liquid injection hole 40 penetrating through the first cover plate 20, and the liquid injection hole 40 is used for injecting electrolyte into the inner cavity of the battery cell 100.

In one embodiment, the metal shell is a steel shell. Therefore, the battery cell 100 is a battery cell of a steel-shell battery, and the first charge protection device 200 is a charge protection device of a steel-shell battery. It is understood that in other embodiments, the metal housing may be made of other metal materials, and the first charging protection device 200 may be a charging protection device for other types of batteries.

In one embodiment, a first insulating member 301 is disposed between the first rivet 30 and the first cover plate 20, so that an insulating design between the first rivet 30 and the first cover plate 20 is achieved through the first insulating member 301.

Referring to fig. 4 and 5, fig. 4 is a front view of a first charging protection device according to an embodiment of the present application. Fig. 5 is a top view of a first charging protection device according to an embodiment of the present application. The first charging protection device 200 includes a circuit board 210, a first conductive sheet 220, a second conductive sheet 230, and a third conductive sheet 240, the first conductive sheet 220, the second conductive sheet 230, and the third conductive sheet 240 are disposed on one side of the circuit board 210 at intervals along a first direction X, the first conductive sheet 220 and the third conductive sheet 240 are conductively connected with the first cover plate 20 of the battery cell 100 to form a first tab 22 and a third tab 24, the second conductive sheet 230 is conductively connected with the first rivet 30 of the battery cell 100 to form a second tab 23, and the first tab 22 and the third tab 24 are disposed on two sides of the second tab 23. The second tab 23 is a positive electrode, and the first tab 22 and the third tab 24 are negative electrodes. The charge protection device 200 also includes a first battery port 250 and a second battery port 260. The first and second battery ports 250 and 260 are disposed on the other side of the circuit board 210 at intervals along the first direction X. Referring to fig. 6, the charge protection device 200 further includes a first switching unit 270, a second switching unit 280 and a control unit 2005 disposed adjacent to the second tab 23. The first negative terminal 2502 of the first battery port 250 is connected to the first tab 22, and the first positive terminal 2501 of the first battery port 250 is connected to the first switching unit 270 and the second tab 23 to form a first conductive path; the second positive terminal 2601 of the second battery port 260 is connected to the second switch unit 280 and the second tab 23, and the second negative terminal 2602 of the second battery port 260 is connected to the third tab 24 to form a second conductive path; the control unit 2005 is connected to the first switch unit 270 and the second switch unit 280, respectively, and is configured to control the first switch unit 270 and the second switch unit 280 to be turned on or off. Thus, the first charge protection device 200 may transfer current through the first and second conductive paths, it being understood that the current flowing through the first and second battery ports 250 and 260 should be the same, which facilitates overall equalization of the temperature rise of the first charge protection device 200.

Further, in one embodiment, the control unit 2005 has a high-end driving capability, and a difference between a voltage output by the control unit 2005 and a voltage between the second electrode 23 is greater than zero.

Further, in one embodiment, the difference between the voltage output by the control unit 2005 and the voltage of the second tab 23 is greater than or equal to 4V.

Thus, in the present application, the first switch unit 270 is disposed between the second tab 23 and the first positive terminal 2501, and the second switch unit 280 is disposed between the second tab 23 and the second positive terminal 2601, that is, the first switch unit 270 and the second switch unit 280 are both located at the positive electrode of the battery cell 100, so as to implement high-side driving. Moreover, the characteristics of the negative polarity of the metal shell 10 and the first cover plate 20 and the positive polarity of the first rivet 30 of the battery cell 100, which can be well utilized by the high-end driver, can be realized by only insulating the second conducting strip 230 from the first rivet 30, so that the problem of short circuit with the electronic device body caused by the non-insulating design of the metal shell 10 of the battery cell can be effectively solved, and the battery capacity can be improved by the non-insulating design. Moreover, the control unit 2005 can control the first switch unit 270 and the second switch unit 280 to be turned on or off according to actual conditions, and can protect the battery cell 100.

Further, in one embodiment, the second conductive sheet 230 is used to be led out from the first rivet 30, and the first tab 22 and the third tab 24 are used to be led out from any position of the first cover plate 20 except the first rivet 30.

Therefore, in the application, the positions of the two negative electrode lugs can be flexibly adjusted according to the overall layout, and the actual circuit layout is convenient.

Referring to fig. 1 again, fig. 1 is a schematic structural diagram of a battery in a first embodiment of the present application. The circuit board 210 has an elongated shape and includes two first sides 2101 and two second sides 2102. Wherein the length of first side 2101 is substantially greater than the length of second side 2102. The first side 2101 is disposed along a first direction X, where the first direction X is a length direction of the circuit board 210 and a width direction of the battery cells 100, and the second side 2102 is disposed perpendicular to the first side 2101. Referring to fig. 4 and 5 again, the first conductive sheet 220, the second conductive sheet 230, and the third conductive sheet 240 are disposed at intervals in the first direction X on the first edge 2101. The first conductive sheet 220, the second conductive sheet 230, and the third conductive sheet 240 are L-shaped. First ends of the first conductive plate 220, the second conductive plate 230 and the third conductive plate 240 are attached to the circuit board 210 by SMT, second ends of the first conductive plate 220 and the third conductive plate 240 are conductively attached to the first cover plate 20, and a second end of the second conductive plate 230 is conductively attached to the first rivet 30. Thereby, the first tab 22, the second tab 23, and the third tab 24 are formed.

Alternatively, in one embodiment, the first conductive sheet 220, the second conductive sheet 230, and the third conductive sheet 240 are nickel sheets, which may be implemented by, but not limited to, copper nickel plating, for example.

Alternatively, in one embodiment, the first conductive sheet 220, the second conductive sheet 230, and the third conductive sheet 240 are L-shaped, but may have other shapes.

Thus, in this application, electric core 100 and first charge protection device 200 form a two-positive negative three-pole ear structure through laser welding, and the second conducting strip 230 of being connected with first rivet 30 is the positive ear, and two negative pole ears are located positive ear both sides respectively, directly draw forth from first apron 20, utilize the negative pole polarity of first apron 20, and two negative pole ear draw-out positions can be adjusted in a flexible way, can realize the optimal design of whole overall arrangement.

Referring to fig. 6 and 7 together, fig. 6 is a layout diagram of a first charge protection device according to an embodiment of the present application. Fig. 7 is a circuit diagram of a first charge protection device according to an embodiment of the present application. The first battery port 250 is disposed adjacent the first tab 22 and the second battery port 260 is disposed adjacent the third tab 24. Further, the first positive terminal 2501 of the first battery port 250 and the second positive terminal 2601 of the second battery port 260 are adjacent to the second pole ear 23. That is, the first battery port 250 is a first positive terminal 2501 of the first battery port 250 near the second tab 23 (i.e., the first rivet 30) and a first negative terminal 2502 of the first battery port 250 away from the second tab 23. The second battery port 260 is adjacent to the second tab 23 and is a second positive terminal 2601 of the second battery port 260 and is distal to the second tab 23 and is a second negative terminal 2602 of the second battery port 260.

Thus, the first switch unit 270 is disposed between the second tab 23 and the first positive terminal 2501 of the first battery port 250, and the second switch unit 280 is disposed between the second tab 23 and the second positive terminal 2601 of the second battery port 260, that is, the first switch unit 270 and the second switch unit 280 are both located at the positive terminals of the battery cells 100, and the control unit 2005 implements positive terminal driving, that is, high terminal driving. Accordingly, the metal case 10 may not be required to be designed to be insulated, and the capacity of the battery 1000 may be increased.

Alternatively, in one embodiment, the circuit board 210 includes a first face 2103 and a second face (not shown) disposed opposite to each other, and the first conductive sheet 220, the second conductive sheet 230, the third conductive sheet 240, the first switch unit 270, and the second switch unit 280 are disposed on the first face 2103. Of course, in other embodiments, the first switch unit 270 and the second switch unit 280 may be selectively disposed on the second surface. The charging protection device 200 further includes a current sampling unit 2006, the current sampling unit 2006 is disposed on the second surface and located on the back surface of the second tab 23, the current sampling unit 2006 is connected in series between the first positive terminal 2501 and the second tab 23, the current sampling unit 2006 is further connected in series between the second positive terminal 2601 and the second tab 23, and the control unit 2005 is configured to control the first switching unit 270 and the second switching unit 280 to be turned on or off based on a sampling current value of the current sampling unit 2006.

Further, in one embodiment, the current sampling unit 2006 includes a first current sampling resistor R2 and a second current sampling resistor R2, and the first current sampling resistor R1 and the second current sampling resistor R2 are disposed in parallel on the second surface and behind the second tab 23, connected in series between the first positive terminal 2501 and the second tab 23, and connected in series between the second positive terminal 2601 and the second tab 23. It is understood that the first current-like resistor R1 may be formed by connecting a plurality of resistors in parallel. The second current sampling resistor R2 may be formed by connecting a plurality of resistors in parallel. Thus, heat generation can be reduced.

Therefore, the first current sampling resistor R1 and the second current sampling resistor R2 are placed on the back of the second tab 23 in the layout, the optimal path from the first current sampling resistor R1 to the second tab 23 through the second current sampling resistor R2 can be achieved, and meanwhile, the first current sampling resistor R1 and the second current sampling resistor R2 are connected in parallel, so that power can be improved, and heating can be reduced.

Optionally, in one embodiment, the charge protection device includes a first protection circuit for protecting the first conduction path and the second conduction path from being charged or discharged in a normal state. Specifically, the first protection circuit is connected between the first tab 22, the second tab 23, the third tab 24 and the first battery port 250, and is also connected between the first tab 22, the second tab 23, the third tab 24 and the second battery port 260, the first controller U1 is configured to detect the actual voltage and the magnitude of the charging and discharging current of the battery cell 100, and when the voltage or the charging and discharging current of the battery cell 100 exceeds a protection threshold, the first controller U1 controls to turn off the first switch S2 and the second switch S3, so as to disconnect the conductive paths between the second tab 23 and the first battery port 250, between the second tab 23 and the second battery port 260, and thus, the battery cell 100 is protected. Specifically, the first switch unit 270 includes a first switch S2, the first switch S2 is disposed between the first positive terminal 2501 of the first battery port 250 and the second tab 23, the second switch unit 280 includes a second switch S3, the second switch S3 is disposed between the second positive terminal 2601 of the second battery port 260 and the second tab 23, the control unit 2005 includes a first controller U1, the first controller U1 is disposed on a side of the first tab 22 away from the second tab 23, the first controller U1 is connected to the first switch 22, the second switch 23 and the current sampling unit 2006 respectively to form a first protection circuit, and the first protection circuit is configured to control on and off of the first switch S2 and the second switch S3 based on a sampling current value of the current sampling unit 2006, so as to protect the battery cell 100.

Specifically, in one embodiment, the first controller U1 has a CO1 terminal and a DO1 terminal. The first switch S2 includes a charge switch K3 and a discharge switch K4. The second switch S3 includes a charge switch K1 and a discharge switch K2. The CO1 terminal and the DO1 terminal of the first controller U1 can output a constant voltage with respect to the second tab 23, and the voltage may be in the range of 4 to 5V and 4 to 6V, or another voltage, that is, the voltage between the CO1 terminal and the DO1 terminal of U1 is higher than the voltage of the positive electrode 23 by 4 to 5V and 4 to 6V, or another voltage. That is, the CO1 end of the first controller U1 may drive the charging switch K3 to be turned on by the G3 end of the first switch S2, the charging switch K1 to be turned on by the G1 end of the second switch S3, the DO1 end of the first controller U1 drives the discharging switch K4 to be turned on by the G4 end of the first switch S2, and the discharging switch K2 to be turned on by the G2 end of the second switch S3, so that a conductive path is formed between the L3 end and the L4 end of the first switch S2, and a conductive path is formed between the L1 end and the L2 end of the second switch S3.

Optionally, in one embodiment, the charge protection device 200 further includes a first voltage sampling resistor RV1, a second voltage sampling resistor RV2, and a filter capacitor C1, and the first controller U1, the first switch S2, the second switch S3, the first voltage sampling resistor RV1, the second voltage sampling resistor RV2, the first current sampling resistor R1, the second current sampling resistor R2, and the filter capacitor C1 jointly form a first protection circuit. Therefore, the first controller U1 can selectively turn off or turn on the first switch S2 and the second switch S3 based on whether the parallel sampling result of the first voltage sampling resistor RV1, the second voltage sampling resistor RV2, the first current sampling resistor R1, and the second current sampling resistor R2 exceeds the protection threshold, so as to protect the first conduction path and the second conduction path.

Further, in one embodiment, the first controller U1 is configured to sample a first voltage value between the first tab 22 and the second tab 23 through the first voltage sampling resistor RV1, and sample a second voltage value between the second tab 23 and the third tab 24 through the second voltage sampling resistor RV2, so as to obtain a first voltage average of the first voltage value and the second voltage value. The first controller U1 further samples a total current value that passes after the first current sampling resistor R1 and the second current sampling resistor R2 are connected in parallel, and the first controller U1 is configured to control the first switch S2 and the second switch S3 to be turned off when at least one of the total current value and the first voltage average value exceeds a corresponding protection threshold.

Specifically, in the first protection circuit, the first controller U1 is a protection IC having a high-end voltage driving capability, the VD1 end of the first controller U1 provides a working power supply input for the protection IC, and simultaneously, the VD1 end and the CS1 end are used together as a current sampling signal line, and are connected to two ends of the first current sampling resistor R1 and the second current sampling resistor R2 after being connected in parallel, and whether the charging and discharging current exceeds the threshold value of the current protection is determined by reflecting the voltage drop at two ends of the first current sampling resistor R1 and the second current sampling resistor R2. The VD1 end and the VS1 end of the first controller U1 are used as a sampling signal line of the voltage of the battery cell 100 together, wherein the VS1 end is a zero potential point of the first controller U1, and the first voltage sampling resistor RV1 is connected between the first tab 22 and the VS1 end of the first controller U1, and is configured to sample a first voltage value between the second tab 23 and the first tab 22. The filter capacitor C1 is connected between the VD1 terminal and the VS1 terminal. The second voltage sampling resistor RV2 is connected between the third pole ear 24 and the VS1 end of the first controller U1, and is configured to sample a second voltage value between the second pole ear 23 and the third pole ear 24, obtain a first voltage average value of the first voltage value and the second voltage value, and when the first voltage average value exceeds the overvoltage protection threshold of the first controller U1, the high level of the CO1 end of the first controller U1 becomes the low level, and the first switch S2 and the second switch S3 are controlled to be turned off, so that charging cannot be performed, and the electric core 100 is protected. When the first voltage mean value is lower than the undervoltage protection threshold of the first controller U1, the high levels of the CO1 end and the DO1 end of the first controller U1 are changed into the low levels, and the first switch S2 and the second switch S3 are controlled to be turned off, so that the battery cell 100 cannot be discharged to be protected.

Optionally, in one embodiment, the charging protection device 200 further includes a second protection circuit for protecting the first conductive path and the second conductive path from being charged or discharged under normal conditions. Specifically, the second protection circuit is connected between the first tab 22, the second tab 23, the third tab 24 and the first battery port 250, and is also connected between the first tab 22, the second tab 23, the third tab 24 and the second battery port 260, the second controller U2 is configured to detect the actual voltage and the magnitude of the charging and discharging current of the battery cell 100, and when the voltage or the charging and discharging current of the battery cell 100 exceeds a protection threshold, the second controller U2 controls to turn off the third switch S1 and the fourth switch S4, so as to disconnect the conductive paths between the second tab 23 and the first battery port 250, and between the second tab 23 and the second battery port 260, thereby playing a role in protecting the battery cell 100. It is understood that the first protection circuit and the second protection circuit are two independent protection circuits, and are used to protect the battery cells 100, and when one of the protection circuits fails, the battery cells 100 are protected by the other protection circuit. Under the condition that the first protection circuit and the second protection circuit work normally, logically, the first protection circuit is required to perform protection action, particularly a voltage protection function, the voltage protection has overvoltage protection and undervoltage protection, the overvoltage protection threshold value is usually about 4.6V, and the undervoltage protection threshold value is usually about 2.5V. Specifically, the first switch unit 270 includes a third switch S1, the third switch S1 is disposed between the first positive terminal 2501 of the first battery port 250 and the first switch S2, the second switch unit 280 includes a fourth switch S4, the fourth switch S4 is disposed between the second positive terminal 2601 of the second battery port 260 and the second switch S3, the charge protection device 200 further includes a second controller U2, the second controller U2 is disposed on a side of the third tab 24 away from the second tab 23, the second controller U2 is respectively connected to the third switch S1 and the fourth switch S4 for controlling on or off of the third switch S1 and the fourth switch S4 based on the sampling current value of the current sampling unit 2006.

Specifically, in one embodiment, the third switch S1 includes a charging switch K5 and a discharging switch K6. The fourth switch S4 includes a charge switch K7 and a discharge switch K8. The second controller U2 has a high-end driving capability, and the CO2 end and the DO2 end of the second controller U2 output a certain voltage relative to the second tab 23, where the voltage range is 4-5V, or 4-6V, or other voltages, that is, the CO2 end of the second controller U2 can drive the charging switch K5 to be opened through the G5 end of the third switch S1, drive the charging switch K7 to be opened through the G7 end of the fourth switch S4, the DO2 end of the second controller U2 drives the discharging switch K6 to be opened through the G6 end of the third switch S1, and drive the discharging switch K8 to be opened through the G8 end of the fourth switch S4, so that a conductive path is formed between the L5 end and the L6 end of the third switch S1, and a conductive path is formed between the L7 end and the L8 end of the fourth switch S4. When the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4 are all turned on, the charge and discharge loops from the first battery port 250 and the second battery port 260 to the battery cell 100 are completely turned on, so that a charging or discharging action can be performed.

It can be understood that, in one embodiment, the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4 are voltage-driven MOS transistors, and are widely applied to the charge protection device 200, and the operation principle thereof is not described in detail herein, the first switch S2 and the second switch S3 are controlled by the first controller U1 to be turned on or off simultaneously, the third switch S1 and the fourth switch S4 are controlled by the second controller U2 to be turned on or off simultaneously, the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4 should have the same type and symmetry on the same circuit board 210, for example, the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4 may each be 1, or may each be connected in parallel with one or even multiple switches, and the number of switches in parallel is the same, the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4 may each be connected in parallel to reduce internal resistance, and the back-to-back-switching circuits are designed to-back-switching circuits.

Thus, the first positive terminal 2501 of the first battery port 250 is connected to the third switch S1 and the first switch S2, and is merged to the first current sampling resistor R1 and the second current sampling resistor R2, and the second positive terminal 2601 of the second battery port 260 is connected to the fourth switch S4 and the second switch S3, and is merged to the second current sampling resistor R2 and the first current sampling resistor R1. The first positive terminal 2501 of the first battery port 250 to the first switch unit 270 and the second positive terminal 2601 of the second battery port 260 to the second switch unit 280 are of a two-way shunt structure, the first negative terminal 2502 of the first battery port 250 and the second negative terminal 2602 of the second battery port 260 are directly connected to the first cover plate 20 through the first tab 22 and the third tab 24, and the space for copper foil connection between the first and second battery ports 210 and 260 is saved by using the negative polarity of the first cover plate 20, so that the heat dissipation pressure of the circuit board 210 is reduced, and meanwhile, the metal shell 10 is equivalent to a large heat dissipation fin, so that heat generated on the flow guide path of the first tab 22 and the third tab 24 can be dissipated quickly. In addition, the first switch S2, the second switch S3, the third switch S1, the fourth switch S4, the first current sampling resistor R1, and the second current sampling resistor R2 are all disposed at the positive terminal of the battery cell 100, so as to implement high-terminal driving, and the first control unit U1 and the second control unit U2 have high-terminal driving capability, and the CO1 terminal, the DO1 terminal, the CO2 terminal, and the DO2 terminal thereof can output higher voltage than that of the battery cell 100, for example, 1 time or more than the voltage of the battery cell 100, so as to drive to open the gate terminals of the first switch unit 270 and the second switch unit 280.

Optionally, in one embodiment, the charge protection device 200 further includes a third voltage sampling resistor RV3, a fourth voltage sampling resistor RV4 and a second filter capacitor C2, and the second controller U2, the third switch S1, the fourth switch S4, the third voltage sampling resistor RV3, the fourth voltage sampling resistor RV4, the first current sampling resistor R1 and the second current sampling resistor R2 together form a second protection circuit. Specifically, the second controller U2 is configured to sample a third voltage value between the first tab 22 and the second tab 23 through the third voltage sampling resistor RV3, and sample a fourth voltage value between the second tab 23 and the third tab 24 through the fourth voltage sampling resistor RV4, so as to obtain a second voltage average value of the third voltage value and the fourth voltage value; the second controller U2 further samples a total current value after the first current sampling resistor R1 and the second current sampling resistor R2 are connected in parallel, and the second controller U2 is configured to control the third switch S1 and the fourth switch S4 to be turned on or off according to the second voltage average value and the total current value, so as to form protection for the first conductive path and the second conductive path.

Specifically, in this embodiment, in the second protection circuit, the second controller U2 is a protection IC having a high-end voltage driving capability, the VD2 end of the second controller U2 provides a working power supply input for the protection IC, and simultaneously, the VD2 end and the CS2 end are used together as a current sampling signal line, and are connected to two ends of the first current sampling resistor R1 and the second current sampling resistor R2 after being connected in parallel, and whether the charging and discharging current exceeds the threshold value of the current protection is determined by reflecting the voltage drop at two ends of the first current sampling resistor R1 and the second current sampling resistor R2. The third voltage sampling resistor RV3 and the fourth voltage sampling resistor RV4 provide voltage sampling for the second controller U2, the VD2 end and the VS2 end of the second controller U2 are used together as a cell voltage sampling signal line, the VS2 end is a zero potential point of the second controller U2, the third voltage sampling resistor RV3 is connected between the first tab 22 and the VS2 end of the second controller U2 and is used for sampling a third voltage value between the second tab 23 and the first tab 22, and the fourth voltage sampling resistor RV4 is connected between the third tab 24 and the VS2 end of the second controller U2 and is used for sampling a fourth voltage value between the second tab 23 and the third tab 24 and obtaining a second voltage average value according to the third voltage value and the fourth voltage value. Wherein, the filter capacitor C2 is connected between the VD2 end and the VS2 end. When the second voltage average value exceeds the overvoltage protection threshold of the second controller U2, the high level of the CO2 terminal of the second controller U2 becomes the low level, and the third switch S1 and the fourth switch S4 are controlled to be turned off, so that charging cannot be performed, and the battery cell 100 is protected. When the second voltage average value is lower than the undervoltage protection threshold of the second controller U2, the high levels of the CO2 end and the DO2 end of the second controller U2 become low levels, and the third switch S1 and the fourth switch S4 are controlled to be turned off, so that the battery cell 100 cannot be discharged.

Optionally, in one embodiment, the charging protection device 200 further includes a third controller U3, and the third controller U3 is disposed adjacent to the first controller U1 or adjacent to the second controller U2. Alternatively, in one embodiment, the third controller U3 may be integrated with the first controller U1 or integrated with the second controller U2. The third controller U3 includes a temperature-sensing resistor NTC for sensing the temperature of the battery cell 100, and is used for the electronic device system to decide a charging strategy.

Optionally, in an embodiment, referring to fig. 6 again, the charge protection device 200 further includes a fifth voltage sampling resistor RV5, the fifth voltage sampling resistor RV5 is connected to the second tab 23 and the VD3 end of the third controller U3, and the VS3 end of the third controller U3 is connected to the first tab 22 and the third tab 24, and is configured to sample a fifth voltage value between the first tab 22 and the second tab 23 and a sixth voltage value between the second tab 23 and the third tab 24, and obtain a third voltage average value according to the fifth voltage value and the sixth voltage value. The third controller U3, the fifth voltage sampling resistor RV5, the temperature sensing resistor NTC, the first current sampling resistor R1 and the second current sampling resistor R2 jointly form a communication management circuit. The VD3 end of the third controller U3 is a voltage sampling end, the VD3 end is connected with the second pole ear 23, the VS3 end is a zero potential point of the third controller U3, the VS3 end is connected with the first pole ear 22 and the third pole ear 24, the SRN end and the SRP end are current sampling signal lines and are respectively connected to two ends of the first current sampling resistor R1 and the second current sampling resistor R2 which are connected in parallel, the SCL end is a clock signal line, the SDA end is a data signal line, and the SCL end and the SDA end jointly form an information interaction function between the communication management circuit and the electronic equipment. The third controller U3 samples the voltage, current, and temperature values of the battery cell 100, and reports the sampled values to the electronic device for mounting the battery 1000, so that the electronic device can make a corresponding decision.

As described above, the first protection circuit, the second protection circuit, and the communication management circuit share the first current sampling resistor R1 and the second current sampling resistor R2. The first controller U1, the second controller U2, and the third controller U3 may determine the magnitude of the current in the charging and discharging loop by detecting the voltage drop across the first current sampling resistor R1 and the second current sampling resistor R2, so as to perform corresponding determination and corresponding control.

Optionally, in an embodiment of the present invention, please refer to fig. 8 to fig. 10, and fig. 8 and fig. 9 are schematic structural diagrams of a battery cell in a second embodiment of the present application. Fig. 10 is a schematic structural view of a battery in a second embodiment of the present application. Different from the first embodiment, in the second embodiment, the metal shell 10 further has a second opening opposite to the first opening, the battery cell 100a further includes a second cover plate 50, the second cover plate 50 is disposed on the second opening, a second rivet 60 is disposed on the second cover plate 50, the second rivet 60 passes through the second cover plate 50 and is connected to the positive electrode of the pole-core assembly, the second rivet 60 is insulated from the second cover plate 50, the negative electrode of the pole-core assembly is connected to the second cover plate 50, the battery 1000a further includes a second charge protection device 300, the second charge protection device 300 includes a second circuit board 310, and a fourth conductive sheet, a fifth conductive sheet and a sixth conductive sheet disposed on the second circuit board 310, the fourth conductive sheet and the sixth conductive sheet are located on two sides of the fifth conductive sheet, the fifth conductive sheet is connected to the second rivet 60 to form a fifth tab 33, and the fourth conductive sheet and the sixth conductive sheet are connected to the second cover plate 50 to form a fourth tab 32 and a sixth tab 34; the second charge protection device 300 further includes a third battery port 350 and a fourth battery port 360, a third conductive path being formed between the third battery port 350 and the fourth tab 32 and the fifth tab 33, and a fourth conductive path being formed between the fourth battery port 360 and the fifth tab 33 and the sixth tab 34. It is understood that the second charging protection device 300 has the same structure and circuit connection relationship with the first charging protection device 200, and will not be described herein again.

Therefore, in the present embodiment, the metal shell 10 is provided with two sets of upper and lower cover plates, i.e., the first cover plate 20 and the second cover plate 50, the first cover plate 20 is provided with the first rivet 30, and the second cover plate 50 is provided with the second rivet 60. Therefore, the first battery port 250, the second battery port 260, the third battery port 350 and the fourth battery port 360 can be used for charging at the same time, so that the charging power can be doubled, and if the single rivet design is adopted to realize 100W quick charging, the double rivet design can realize 200W quick charging.

Alternatively, in one embodiment, the third battery port 350 is disposed adjacent the fourth tab 32 and the fourth battery port 360 is disposed adjacent the sixth tab 34.

Further, in one embodiment, the second rivet 60 is insulated from the second cover plate 50 by two insulators.

The present application further provides an electronic device, which includes a battery and an electronic device body for accommodating the battery, where the battery is the battery 1000, the battery 1000 includes a first battery port 250 and a second battery port 260, and in a case where the battery 1000 is fixed in the electronic device body, the first battery port 250 and the second battery port 260 are used to be electrically connected to corresponding ports in the electronic device body, respectively.

Alternatively, in one embodiment, the battery 1000a includes a first battery port 250, a second battery port 260, a third battery port 350 and a fourth battery port 360, and in a case where the battery 1000a is fixed in the electronic device body, the first battery port 250, the second battery port 260, the third battery port 350 and the fourth battery port 360 are configured to be electrically connected to corresponding ports in the electronic device body, respectively. Thereby, the charging efficiency can be further improved.

In conclusion, the present application can be used to enhance the performance of the prior art and to provide a practical product with the above mentioned excellent characteristics.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present application are intended to be included within the scope of the present application.

Claims (19)

1. A charge protection device is characterized by comprising a circuit board, a first conducting plate, a second conducting plate and a third conducting plate, wherein the first conducting plate, the second conducting plate and the third conducting plate are arranged on one side of the circuit board at intervals along a first direction and are used for being in conductive connection with a first cover plate of a battery cell to form a first lug and a third lug; the charging protection device further comprises a first battery port and a second battery port, and the first battery port and the second battery port are arranged on the other side of the circuit board at intervals along the first direction; the charging protection device further comprises a first switch unit, a second switch unit and a control unit which are arranged adjacent to the second pole ear; a first negative electrode end of the first battery port is connected with the first tab, and a first positive electrode end of the first battery port is connected with the first switch unit and the second tab to form a first conductive path; a second positive terminal of the second battery port is connected with the second switch unit and the second pole lug, and a second negative terminal of the second battery port is connected with the third pole lug to form a second conductive path; the control unit is respectively connected with the first switch unit and the second switch unit and is used for controlling the connection or disconnection of the first switch unit and the second switch unit.

2. The charge protection device of claim 1, wherein the second conductive tab is configured to exit from the first rivet, and the first tab and the third tab are configured to exit from any location of the first cover plate other than the first rivet.

3. The charge protection device of claim 1, wherein the first battery port is disposed adjacent the first tab and the second battery port is disposed adjacent the third tab.

4. The charge protection device of claim 1, wherein the first positive end of the first battery port and the second positive end of the second battery port are disposed adjacent to the second pole ear.

5. The charge protection device of claim 1, wherein the first switch unit is disposed between the first positive terminal of the first battery port and the second pole lug, and the second switch unit is disposed between the second positive terminal of the second battery port and the second pole lug.

6. The charging protection device of claim 1, wherein the circuit board comprises a first surface and a second surface which are arranged oppositely, the first conductive sheet, the second conductive sheet, the third conductive sheet, the first switch unit and the second switch unit are arranged on the first surface, the charging protection device further comprises a current sampling unit, the current sampling unit is arranged on the second surface and located on the back surface of the second pole ear, the current sampling unit is connected in series between the first positive terminal and the second pole ear, the current sampling unit is connected in series between the second positive terminal and the second pole ear, and the control unit is used for controlling the connection or disconnection of the first switch unit and the second switch unit based on the sampling current value of the current sampling unit.

7. The charge protection device of claim 6, wherein the current sampling unit comprises a first current sampling resistor and a second current sampling resistor, and the first current sampling resistor and the second current sampling resistor are arranged on the second surface in parallel.

8. The charging protection device of claim 6, wherein the charging protection device comprises a first protection circuit, the first switch unit comprises a first switch, the first switch is disposed between the first positive terminal of the first battery port and the second tab, the second switch unit comprises a second switch, the second switch is disposed between the second positive terminal of the second battery port and the second tab, the control unit comprises a first controller, the first controller is disposed on a side of the first tab away from the second tab, the first controller is respectively connected with the first switch, the second switch and the current sampling unit to form the first protection circuit, and the first protection circuit is configured to control on or off of the first switch and the second switch based on a sampling current value of the current sampling unit.

9. The charge protection device of claim 8, wherein the first protection circuit further comprises a first voltage sampling resistor and a second voltage sampling resistor, the first voltage sampling resistor and the second voltage sampling resistor are integrated with the first controller, and the first controller is configured to sample a first voltage value between the first negative electrode and the positive electrode through the first voltage sampling resistor and sample a second voltage value between the positive electrode and the second negative electrode through the second voltage sampling resistor to obtain a first voltage average of the first voltage value and the second voltage value; the first controller is used for controlling the first switch and the second switch to be switched off when at least one of the sampled current value and the first voltage average value exceeds a corresponding protection threshold value.

10. The charging protection device according to claim 8, further comprising a second protection circuit, wherein the first switch unit comprises a third switch disposed between the first positive terminal of the first battery port and the first switch, the second switch unit comprises a fourth switch disposed between the second positive terminal of the second battery port and the second switch, and the charging protection device further comprises a second controller disposed on a side of the third tab away from the second tab, the second controller being connected to the third switch and the fourth switch, respectively, for controlling on or off of the third switch and the fourth switch based on a sampled current value of the current sampling unit.

11. The charging protection device of claim 10, wherein the second protection circuit further comprises a third voltage sampling resistor and a fourth voltage sampling resistor, the third voltage sampling resistor and the fourth voltage sampling resistor are integrated with the second controller, the second controller is configured to sample a third voltage value between the first negative electrode and the positive electrode through the third voltage sampling resistor and sample a fourth voltage value between the positive electrode and the second negative electrode through a fourth voltage sampling resistor, so as to obtain a second voltage average value of the third voltage value and the fourth voltage value, and the second controller is configured to control the third switch and the fourth switch to turn off when at least one of the sampled current value and the second voltage average value exceeds a corresponding protection threshold value.

12. The charging protection device of claim 10, further comprising a third controller disposed adjacent to the first controller or adjacent to the second controller, wherein the third controller comprises a temperature-sensitive resistor for sensing a temperature of the battery cell for an electronic equipment system to decide a charging strategy.

13. A battery, comprising a first charging protection device according to any one of claims 1 to 12, wherein the battery further comprises a battery cell, the battery cell comprises a metal casing, a first cover plate and a pole piece assembly, the metal casing has a first opening, the pole piece assembly is disposed in an inner cavity of the metal casing, the first cover plate is covered on the first opening of the metal casing to seal the pole piece assembly in the inner cavity of the metal casing, the battery cell further comprises a first rivet disposed on one side of the first cover plate away from the metal casing, the first rivet passes through the first cover plate and is connected with a positive electrode of the pole piece assembly, the first rivet is insulated from the first cover plate, a negative electrode of the pole piece assembly is connected with the first cover plate, the first cover plate is further provided with a liquid injection hole penetrating through the first cover plate, and the liquid injection hole is used for injecting an electrolyte into the inner cavity of the battery cell; first charge protection device include the circuit board with set up in first conducting strip, second conducting strip and third conducting strip on the circuit board, first conducting strip is electrically conducted to be connected near notes liquid hole and form first utmost point ear on the first apron, the electrically conductive connection of second conducting strip is in on the first rivet and form the second utmost point ear, the electrically conductive connection of third conducting strip is in on the first apron and be located the second utmost point ear is kept away from on one side of first utmost point ear, and form the third utmost point ear, the second utmost point ear is anodal, first utmost point ear with the third utmost point ear is the negative pole.

14. The battery of claim 13, wherein the metal case is a steel can case.

15. The battery of claim 13, wherein the first, second and third conductive sheets are L-shaped, and first ends of the first, second and third conductive sheets are attached to the circuit board by surface mount technology; and the second ends of the first conducting plate and the third conducting plate are conductively connected to the first cover plate, and the second end of the second conducting plate is conductively connected to the first rivet.

16. The battery of claim 13, wherein the metal shell has a second opening opposite to the first opening, the electric core further includes a second cover plate, the second cover plate is covered on the second opening, a second rivet is disposed on the second cover plate, the second rivet penetrates through the second cover plate and is connected to the positive electrode of the pole core assembly, the second rivet is insulated from the second cover plate, the negative electrode of the pole core assembly is connected to the second cover plate, the battery further includes a second charging protection device, the second charging protection device includes a second circuit board, and a fourth conductive sheet, a fifth conductive sheet and a sixth conductive sheet sequentially disposed on the second circuit board at intervals, the fifth conductive sheet is conductively connected to the second rivet to form a fifth tab, and the fourth conductive sheet and the sixth conductive sheet are conductively connected to the second cover plate to form a fourth tab and a sixth tab; the second charging protection device is the same as the first charging protection device.

17. The battery of claim 16, wherein second charge protection device further comprises a third battery port disposed adjacent to the fourth pole ear and a fourth battery port disposed adjacent to the sixth pole ear.

18. The battery of claim 16, wherein the first rivet is insulated from the first cover plate by a first insulator; the second rivet and the second cover plate are insulated through a second insulating piece.

19. An electronic device comprising a battery and an electronic device body for receiving the battery, the battery being as claimed in any one of claims 13 to 18, the battery comprising at least a first battery port and a second battery port for electrically connecting with corresponding ports in the electronic device body, respectively, when the battery is secured in the electronic device body.

Images