Battery cell charging protection failure additional electric quantity consumption circuit and battery pack

Abstract

The utility model provides a battery cell charging protection failure additional electric quantity consumption circuit and a battery pack. The circuit comprises a battery cell module, a secondary protection chip, an analog front-end chip, a discharge control module, a primary protection module, a secondary protection module and an electric quantity consumption module, the battery cell module is respectively connected with the secondary protection chip, the analog front-end chip, the discharge control module and the electric quantity consumption module, the electric quantity consumption module is also respectively connected with the positive electrode end P + of the charging loop, the secondary protection module and the secondary protection chip, and the secondary protection module is respectively connected with the primary protection module and the secondary protection chip. And the primary protection module is also respectively connected with the positive electrode end C + of the charging loop and the analog front-end chip. According to the utility model, the electric quantity consumption module is additionally designed under the condition that primary protection and secondary protection are both invalid, so that the purpose that the battery cell cannot be continuously charged is achieved by consuming redundant electric quantity of the charging loop, and safety accidents caused in the charging process of the battery pack are avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery pack circuit technology, and more specifically, to a circuit for additional power consumption due to cell charging protection failure and a battery pack. Background Technology

[0002] The battery pack's function is to provide power to the entire device and also needs to have charging capabilities. The charging and discharging circuit is configured with three external interfaces (P+, C+, P- / C-). As we all know, overcharging a battery pack can cause it to catch fire or even explode, posing a huge safety risk. Therefore, developers usually incorporate multiple overcharge protections in the charging circuit, specifically between P+ and C+, to ensure charging safety. However, if a short circuit occurs between the external P+ and C+ interfaces of the battery pack, or if the P+ port is mistakenly used as the C+ port for charging, all overcharge protection circuits will be short-circuited. When the overcharge protection circuit is short-circuited, or if the main control module program that controls the protection circuit malfunctions, the charging protection function will fail, and the battery pack may catch fire or even explode during charging, causing a safety accident. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide an additional power consumption circuit and battery pack in case of failure of cell charging protection. By adding a power consumption circuit in case of failure of both primary and secondary protection, the excess power after overcharging is consumed, thereby avoiding safety accidents after overcharging to a certain extent.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An additional power consumption circuit for battery cell charging protection failure includes a battery cell module, a secondary protection chip, an analog front-end chip, a discharge control module, a primary protection module, and a secondary protection module; characterized in that it further includes a power consumption module.

[0006] One end of the battery cell module is connected to the positive terminal P+ of the secondary protection chip, the power consumption module, and the charging circuit, respectively. The secondary protection chip is connected to both the power consumption module and the secondary protection module. The battery cell consumption module and the secondary protection module are connected in parallel. The third terminal of the secondary protection module is connected to the third terminal of the primary protection module. The second terminal of the primary protection module is connected to the positive terminal C+ of the charging circuit. The other end of the battery cell module is connected to the analog front-end chip and the second terminal of the discharge control module, respectively. The analog front-end chip is connected to the first terminal of the discharge control module and the primary protection module. The discharge control module is connected to the negative terminal P- or the negative terminal C- of the charging circuit.

[0007] In this invention, the power consumption module includes at least a resistor R1 and a field-effect transistor Q1.

[0008] The secondary protection chip is connected to the gate (G) terminal of the field-effect transistor Q1, the drain (D) terminal of the field-effect transistor Q1 is connected to the positive terminal P+ of the charging circuit, and the source (S) terminal of the field-effect transistor Q1 is connected to the ground terminal through a resistor R1.

[0009] In this invention, the secondary protection chip includes at least a CO pin.

[0010] The CO pin of the secondary protection chip is connected to both the power consumption module and the secondary protection module.

[0011] In this invention, the primary protection module includes at least a field-effect transistor Q2. The secondary protection module includes at least a field-effect transistor Q3 and a three-terminal fuse F1.

[0012] In this configuration, the source (S) terminal of the field-effect transistor Q3 is grounded, the drain (D) terminal of the field-effect transistor Q3 is connected to the first terminal of the fuse F1, the third terminal of the fuse F1 is connected to the power consumption module, the second terminal of the fuse F1 is connected to the drain (D) terminal of the field-effect transistor Q2, and the gate (G) terminal of the field-effect transistor Q3 is connected to the CO pin of the secondary protection chip.

[0013] In this invention, the analog front-end chip includes at least the CHG pin and the DSG pin of the analog front-end chip.

[0014] The DSG pin of the analog front-end chip is connected to the discharge control module.

[0015] To achieve the above objectives, the present invention also adopts the following technical solution:

[0016] A battery pack, the battery pack comprising at least one of the above-mentioned cell charging protection failure additional power consumption circuits. Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention proposes an additional power consumption circuit and battery pack for cell charging protection failure. By adding this power consumption circuit, overcharging during battery charging can be effectively prevented when both primary and secondary protection fail, thus avoiding safety accidents and improving battery safety. The circuit design considers different fault scenarios, including short circuits at P+ and C+ or situations where the main control system and analog front-end chip cannot be activated when charging directly from P+. The added power consumption circuit protects against potential overvoltage of the cells during battery pack charging. The main control chip monitors the cell voltage charging status in real time and controls the power consumption circuit to dissipate excess power when necessary, preventing further increase in battery pack charge and potential fires or explosions.

[0018] This invention provides more comprehensive and real-time monitoring and control functions for battery charging protection, offering higher safety and reliability for battery use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a circuit that causes additional power consumption due to a battery cell charging protection failure.

[0020] Figure 2 This is a schematic diagram of a circuit that consumes additional power due to a battery cell charging protection failure.

[0021] Figure 3 This is a flowchart of a circuit that causes additional power consumption due to a battery cell charging protection failure. Detailed Implementation

[0022] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0023] Please refer to Figure 1 In a preferred embodiment, a battery cell charging protection failure additional power consumption circuit includes a battery cell module, a secondary protection chip, an analog front-end chip, a discharge control module, a primary protection module, and a secondary protection module; characterized in that it further includes a power consumption module.

[0024] Compared to the appendix Figure 2 In the prior art, there is a battery cell charging protection circuit. This utility model embodiment adds a power consumption circuit on the basis of the prior art. By adding a power consumption circuit, when both primary and secondary protection fail, it can effectively avoid battery safety accidents caused by charging and improve the safety of battery use.

[0025] One end of the battery cell module is connected to the positive terminal P+ of the secondary protection chip, the power consumption module, and the charging circuit, respectively. The secondary protection chip is connected to both the power consumption module and the secondary protection module. The battery cell consumption module and the secondary protection module are connected in parallel. The third terminal of the secondary protection module is connected to the third terminal of the primary protection module. The second terminal of the primary protection module is connected to the positive terminal C+ of the charging circuit. The other end of the battery cell module is connected to the analog front-end chip and the second terminal of the discharge control module, respectively. The analog front-end chip is connected to the first terminal of the discharge control module and the primary protection module. The discharge control module is connected to the negative terminal P- or the negative terminal C- of the charging circuit.

[0026] It should be noted that in the primary protection module, when the charging circuit reaches the first-level overvoltage protection threshold V1, the charging circuit will disconnect along with the primary protection module, thereby stopping charging and serving as a protection circuit. When the primary protection module fails, or there is a short circuit between C+ and P+ on the battery pack, or P+ is mistakenly used as a charging port, the charger will continue to charge the battery pack, and the cell voltage will continue to rise.

[0027] The charger continues to charge the battery cells. When the charging level reaches the secondary overvoltage protection threshold V2, the charging circuit will stop charging as the secondary protection module disconnects, thus acting as a protection circuit. At threshold V2, the charging circuit will stop charging as the primary protection module disconnects, also acting as a protection circuit. If the secondary protection module fails, or if there is a short circuit between C+ and P+ on the battery pack, or if P+ is mistakenly used as a charging port, the charger will continue to charge the battery pack, and the cell voltage will continue to rise.

[0028] In this embodiment, the primary protection circuit includes at least a field-effect transistor Q2. The secondary protection module includes at least a secondary protection chip, a field-effect transistor Q3, and a three-terminal fuse F1.

[0029] In this configuration, the source (S) terminal of the field-effect transistor Q3 is grounded, the drain (D) terminal of the field-effect transistor Q3 is connected to the first terminal of the fuse F1, the third terminal of the fuse F1 is connected to the power consumption module, the second terminal of the fuse F1 is connected to the drain (D) terminal of the field-effect transistor Q2, and the gate (G) terminal of the field-effect transistor Q3 is connected to the CO pin of the secondary protection chip.

[0030] It should be noted that the gate (G) of MOSFET Q2 is connected to the analog front-end chip, which can activate or deactivate MOSFET Q2. The source (S) of MOSFET Q2 is connected to the positive terminal C+ of the battery pack, and the drain (D) of MOSFET Q2 is connected to the third terminal of the three-terminal fuse F1. The second terminal of fuse F1 is connected to P+, and the first terminal is connected to the drain (D) of MOSFET Q3. The source (S) of MOSFET Q3 is grounded, and its gate (G) is connected to the CO pin of the secondary protection chip.

[0031] When the charging voltage V1 in the circuit reaches the overcharge voltage, the analog front-end chip controls the field-effect transistor Q2 to turn it off, cutting off the charging circuit and providing primary protection.

[0032] The secondary protection circuit includes a secondary protection chip, a field-effect transistor Q3, and a three-terminal fuse F1.

[0033] The gate (G) of MOSFET Q3 is connected to the CO pin of the secondary protection chip. The secondary protection chip controls the activation or deactivation of MOSFET Q3. The source (S) of MOSFET Q3 is grounded, and the drain (D) is connected to the first terminal of the three-terminal fuse F1.

[0034] When the charging voltage V2 in the circuit reaches the overcharge voltage, the secondary protection chip controls the field-effect transistor Q3 to conduct, causing the three-terminal fuse F1 to blow, cutting off the charging circuit and playing a secondary protection role.

[0035] By designing primary and secondary protection modules, the cell voltage can be monitored during charging, and the charging circuit can be cut off when the overvoltage protection thresholds V1 and V2 are reached, thus avoiding overcharging and improving battery safety.

[0036] When both the primary and secondary protection modules fail, the circuit is prone to safety accidents under overcharging conditions. The additionally designed power consumption circuit provides an extra, independent safety protection circuit in case of primary and secondary protection failure, ensuring timely disconnection of the charging circuit under various abnormal conditions to prevent battery overcharging and reduce safety risks. This circuit plays a crucial role in ensuring battery safety.

[0037] Furthermore, as shown in the appendix Figure 3 As shown in this embodiment, the battery pack integrates a battery cell charging protection failure additional power consumption circuit mentioned in a preferred embodiment, including a battery cell module, a secondary protection chip, an analog front-end chip, a discharge control module, a primary protection module, a secondary protection module, and a power consumption module.

[0038] When the battery pack is connected to the charger, the charger begins to supply power to the battery pack. The additional power consumption circuit for cell charging protection failure has three operating states:

[0039] State 1: When the cell voltage is lower than the first-level overvoltage protection threshold V1, the CO pin of the secondary protection chip outputs a low level, and both MOSFETs Q1 and Q3 are in the off state. The CHG pin of the analog front-end chip outputs a low level, and MOSFET Q2 is in the on state. The charger charges the battery pack, and the cell voltage continues to rise.

[0040] State 2: When the cell voltage reaches the first-level overvoltage protection threshold V1, the CHG pin of the analog front-end chip outputs a high level, the field-effect transistor Q2 is in the cut-off state, the charging circuit is disconnected, and charging stops.

[0041] When there is an external short circuit between P+ and C+, or P+ is mistakenly used as a charging port, or the primary protection module fails, the charger will continue to charge the battery pack, and the cell voltage will continue to rise.

[0042] State 3: When the cell voltage reaches the secondary overvoltage protection threshold V2, the CO pin of the secondary protection chip outputs a high level, and MOSFETs Q1 and Q3 are turned on. After MOSFET Q1 is turned on, resistor R1 begins to discharge the cell. After MOSFET Q3 is turned on, the three-terminal fuse blows, the charging circuit is disconnected, and charging stops.

[0043] When external P+ and C+ are short-circuited, or P+ is mistakenly used as a charging port, or the secondary protection module fails, the charger will continue to charge the battery pack. However, since resistor R1 is simultaneously discharging the battery cell and the discharge current is greater than the charging current, the battery cell voltage begins to drop. When the battery cell voltage drops below the secondary overvoltage protection threshold V2, the CO pin of the secondary protection chip outputs a low level, and MOSFETs Q1 and Q3 are turned off, returning to state two.

[0044] When the external P+ and C+ are short-circuited, or P+ is mistakenly used as a charging port, or both the primary and secondary protection modules fail, the battery pack will cycle repeatedly between state two and state three. After the cell voltage exceeds the secondary overvoltage protection threshold V2, resistor R1 will consume the excess power to ensure that the battery pack will not catch fire or explode during charging and cause a safety accident until the fault is resolved.

[0045] In summary, this embodiment of the invention comprehensively protects the safety of the battery during charging by adding a power consumption circuit, avoiding safety accidents caused by overcharging. Simultaneously, through real-time monitoring and control, it ensures that excess power can be consumed promptly and the charging circuit can be cut off under various abnormal conditions, improving the safety and reliability of the battery.

[0046] In summary, battery packs employing additional power consumption circuits to prevent cell charging failures can provide comprehensive protection, preventing safety accidents caused by overcharging and other abnormal conditions, and improving the safety and reliability of the battery pack.

[0047] In the description of this specification, the references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A circuit for additional power consumption due to battery cell charging protection failure, comprising a battery cell module, a secondary protection chip, an analog front-end chip, a discharge control module, a primary protection module, and a secondary protection module; characterized in that, It also includes: a power consumption module; One end of the battery cell module is connected to the positive terminal P+ of the secondary protection chip, the power consumption module, and the charging circuit. The secondary protection chip is connected to both the power consumption module and the secondary protection module. The battery cell consumption module and the secondary protection module are connected in parallel. The third terminal of the secondary protection module is connected to the third terminal of the primary protection module. The second terminal of the primary protection module is connected to the positive terminal C+ of the charging circuit. The other end of the battery cell module is connected to the analog front-end chip and the second terminal of the discharge control module. The analog front-end chip is connected to the first terminal of the discharge control module and the primary protection module. The discharge control module is connected to the negative terminal P- or the negative terminal C- of the charging circuit.

2. The circuit for additional power consumption due to battery cell charging protection failure according to claim 1, characterized in that, The power consumption module includes at least a resistor R1 and a field-effect transistor Q1.

3. The circuit for additional power consumption due to battery cell charging protection failure according to claim 2, characterized in that, The secondary protection chip is connected to the gate (G) terminal of the field-effect transistor Q1, the drain (D) terminal of the field-effect transistor Q1 is connected to the positive terminal P+ of the charging circuit, and the source (S) terminal of the field-effect transistor Q1 is connected to the ground terminal through a resistor R1.

4. The additional power consumption circuit for battery cell charging protection failure according to claim 3, characterized in that, The secondary protection chip includes at least a CO pin; The CO pin of the secondary protection chip is connected to the power consumption module and the secondary protection module.

5. The additional power consumption circuit for battery cell charging protection failure according to claim 4, characterized in that, The primary protection module includes at least a field-effect transistor Q2.

6. The additional power consumption circuit for battery cell charging protection failure according to claim 5, characterized in that, The secondary protection module includes at least a field-effect transistor Q3 and a three-terminal fuse F1.

7. The additional power consumption circuit for battery cell charging protection failure according to claim 6, characterized in that, The source (S) of the field-effect transistor Q3 is grounded, the drain (D) of the field-effect transistor Q3 is connected to the first end of the fuse F1, the third end of the fuse F1 is connected to the power consumption module, the second end of the fuse F1 is connected to the drain (D) of the field-effect transistor Q2, and the gate (G) of the field-effect transistor Q3 is connected to the CO pin of the secondary protection chip.

8. The additional power consumption circuit for battery cell charging protection failure according to claim 7, characterized in that, The analog front-end chip includes at least the CHG pin and the DSG pin of the analog front-end chip.

9. The additional power consumption circuit for battery cell charging protection failure according to claim 8, characterized in that, The DSG pin of the analog front-end chip is connected to the discharge control module.

10. A battery pack, characterized in that, The battery pack includes at least the cell charging protection failure additional power consumption circuit as described in any one of claims 1 to 9.

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