Battery cell protection circuit, multi-tab battery cell, battery and electronic device

Abstract

The present application relates to the technical field of electrical appliance structures, in particular to a battery cell protection circuit, a multi-tab battery cell, a battery and an electronic device. The battery cell protection circuit of the present application is specially designed for a multi-tab battery cell, and ensures compatibility with a battery cell by providing positive and negative tab input interfaces. Positive and negative electrode output connectors are respectively connected to the input interfaces by means of protection branches, so as to achieve accurate control and protection of currents. In a negative electrode protection branch, two negative electrode connection resistors are connected in series with two switch modules to provide current monitoring and anomaly cut-off functions. Each of the switch modules has independent control terminals, respectively allowing measurement of a charging current, a discharging current and a battery cell voltage. A first protection integrated unit and a second protection integrated unit are used for monitoring the state of the battery cell, and when the state of the battery cell is abnormal, controlling the first charging switch module or the first discharging switch module to cut off the circuit in time, thus protecting batteries from damage.

Description

Cell protection circuit, multi-tab cells, batteries, electronic devices

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202422797792.1, filed on November 15, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of electrical structure technology, and in particular to a cell protection circuit, a multi-tab cell, a battery, and electronic equipment. Background Technology

[0004] With the development of battery technology, the types, performance, and operating conditions of batteries are constantly changing. Multitab cells, due to their unique design, can provide lower internal resistance and higher power density, making them increasingly popular in high-performance battery applications. However, related technologies face some challenges and issues in protecting multitab cells.

[0005] Due to the complex structure of multi-tab battery cells, effectively monitoring and controlling the current or voltage corresponding to each tab has become a technical challenge. Traditional cell protection circuits are ill-suited to this complexity, resulting in inaccurate or incomplete protection measures. Therefore, how to monitor the current or voltage at the tabs of multi-tab battery cells and promptly cut off the circuit when abnormalities are detected to protect the battery from damage remains a problem that urgently needs to be solved in the industry. Summary of the Invention

[0006] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a cell protection circuit, a multi-tab cell, a battery, and an electronic device, which can monitor the current or voltage at the tabs of the multi-tab cell, thereby promptly cutting off the circuit when an abnormality is detected to protect the battery from damage.

[0007] The cell protection circuit according to the first aspect of this application is used to protect multi-tab cells, including:

[0008] The positive electrode input interface is used to connect the positive electrode of the multi-electrode battery cell;

[0009] The battery cell negative electrode input interface is used to connect the negative electrode of the multi-electrode battery cell;

[0010] Positive output connector, connected to the positive electrode input interface of the battery cell;

[0011] The negative output connector is connected to the negative electrode input interface of the battery cell via a negative protection branch;

[0012] The negative protection branch is connected in series between the negative output connector and the negative electrode ear input interface of the battery cell, with a first negative electrode access resistor, a second negative electrode access resistor, a first charging switch module and a first discharging switch module. The first charging switch module is provided with a first charging control terminal and a first discharging control terminal, and the first discharging switch module is provided with a second charging control terminal and a second discharging control terminal.

[0013] The first protection integrated unit is provided with a first power supply positive pin, a first power supply negative pin, a first current sensing pin, a first over-discharge detection pin, a first voltage detection pin, and a first switch control pin;

[0014] Wherein, the first power positive pin is connected to the positive tab input interface of the battery cell, the first power negative pin is connected to the negative tab input interface of the battery cell, the first current sensing pin is connected between the first negative connection resistor and the second negative connection resistor, the first over-discharge detection pin is connected to the first charging control terminal, the first voltage detection pin is connected to the first discharging control terminal, and the first switch control pin is located between the first charging switch module and the first discharging switch module;

[0015] The second protection integrated unit is provided with a second power supply positive pin, a second power supply negative pin, a second current sensing pin, a second over-discharge detection pin, a second voltage detection pin, and a second switch control pin;

[0016] The second power positive pin is connected to the positive electrode input interface of the battery cell, the second power negative pin is connected between the first negative electrode connection resistor and the second negative electrode connection resistor, the second current sensing pin is connected between the second negative electrode connection resistor and the first charging switch module, the second over-discharge detection pin is connected to the second charging control terminal, the second voltage detection pin is connected to the second discharge control terminal, and the second switch control pin is located between the first discharge switch module and the negative electrode output connector.

[0017] The battery cell protection circuit according to the embodiments of this application has at least the following beneficial effects:

[0018] The cell protection circuit of this application embodiment provides a positive input interface and a negative input interface for the positive and negative tabs of multi-tab cells, respectively, ensuring compatibility with multi-tab cells. The positive output connector is connected to the positive tab input interface of the cell through a positive protection branch, and the negative output connector is connected to the negative tab input interface of the cell through a negative protection branch. This design allows the cell protection circuit to precisely control and protect the output current.

[0019] In the negative electrode protection branch, a first negative electrode connection resistor, a second negative electrode connection resistor, a first charging switch module, and a first discharging switch module are connected in series. This configuration not only allows for monitoring of the negative electrode output current but also provides additional control points to promptly disconnect the circuit in case of abnormal conditions. The first charging switch module and the first discharging switch module each have independent control terminals, enabling the protection circuit to respond more flexibly to different abnormal situations. For example, the first over-discharge detection pin and the first voltage detection pin are connected to the two control terminals of the first charging switch module, while the second over-discharge detection pin and the second voltage detection pin are connected to the two control terminals of the first discharging switch module. This design allows for separate monitoring and control of over-discharge and overcurrent.

[0020] The introduction of the first and second protection integrated units further enhances the protection capability of the cell protection circuit. Each protection integrated unit is equipped with corresponding power supply positive and negative pins, current sensing pins, over-discharge detection pins, voltage detection pins, and switch control pins. This pin configuration allows the protection integrated unit to comprehensively monitor the operating status of the multi-tab cell, including voltage, current, and temperature. Notably, the first current sensing pin is connected between the first and second negative terminal resistors, and the second current sensing pin is connected between the second negative terminal resistor and the first charging switch module. This allows for precise monitoring of the current flowing through the multi-tab cell. The over-discharge and voltage detection pins are connected to the control terminals of the corresponding switch modules, enabling the protection integrated unit to cut off the circuit by controlling the corresponding switch modules when an abnormality is detected, thereby protecting the multi-tab cell.

[0021] In addition, the first switch control pin is located between the first charging switch module and the first discharging switch module, and the second switch control pin is located between the first discharging switch module and the negative output connector. This provides additional monitoring points for the two switch modules for the cell protection circuit, which helps to monitor the status of the switch modules in real time and ensures the stability and reliability of the cell protection circuit.

[0022] Based on the above embodiments, the cell protection circuit of this application can more effectively cope with the complexity of multi-tab cells, provide comprehensive and accurate protection measures, and ensure the safe operation of multi-tab cells under various working conditions.

[0023] According to some embodiments of this application, the first charging switch module includes two field-effect transistors connected in series through the source and drain. In the first charging switch module, the first charging control terminal refers to the gate of the field-effect transistor near the side of the second negative terminal access resistor, and the first discharging control terminal refers to the gate of the field-effect transistor near the side of the first discharging switch module.

[0024] According to some embodiments of this application, the first discharge switch module includes two field-effect transistors connected in series through the source and drain. In the first discharge switch module, the second charging control terminal refers to the gate of the field-effect transistor on the side closer to the first charging switch module, and the second discharge control terminal refers to the gate of the field-effect transistor on the side closer to the negative output connector.

[0025] According to some embodiments of this application, the first power positive pin is connected to the cell positive tab input interface through a first positive connection resistor, and the second power positive pin is connected to the cell positive tab input interface through a second positive connection resistor.

[0026] According to some embodiments of this application, a first filter capacitor is connected in parallel across the first negative terminal resistor, and a second filter capacitor is connected in parallel across the second negative terminal resistor.

[0027] According to some embodiments of this application, the positive tab input interface of the battery cell includes at least two positive contacts for connecting at least two of the positive tabs of the multi-tab battery cell.

[0028] According to some embodiments of this application, the battery cell negative electrode input interface includes at least two negative electrode contacts for connecting at least two of the negative electrodes of the multi-electrode battery cell.

[0029] According to a second aspect embodiment of this application, a multi-pole battery cell includes:

[0030] The main body includes a positive electrode plate and a negative electrode plate, and the main body is composed of the positive electrode plate and the negative electrode plate;

[0031] At least one positive electrode tab, which is electrically connected to the positive electrode plate;

[0032] At least one negative electrode tab, which is electrically connected to the negative electrode plate;

[0033] The battery cell protection circuit according to any one of the first aspects of this application; wherein the positive electrode input interface of the battery cell protection circuit is connected to the positive electrode, and the negative electrode input interface is connected to the negative electrode.

[0034] The multi-pole battery cell according to the embodiments of this application has at least the following beneficial effects:

[0035] The contents of the above-described battery cell protection circuit embodiments are all applicable to the embodiments of this multi-tab battery cell. The specific functions implemented by this multi-tab battery cell embodiment are the same as those of the above-described battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-described battery cell protection circuit embodiments.

[0036] The battery according to a third aspect embodiment of this application includes:

[0037] The casing has a storage cavity;

[0038] As described in the second aspect of this application, a multi-tab battery cell is disposed in the storage cavity; wherein the positive tab and the negative tab of the multi-tab battery cell extend outward from the storage cavity.

[0039] The battery according to the embodiments of this application has at least the following beneficial effects:

[0040] The contents of the above-described battery cell protection circuit embodiments are all applicable to the embodiments of this battery. The specific functions implemented by the embodiments of this battery are the same as those of the above-described battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-described battery cell protection circuit embodiments.

[0041] An electronic device according to a fourth aspect of this application includes a battery as described in a third aspect of this application.

[0042] The electronic device according to the embodiments of this application has at least the following beneficial effects:

[0043] The contents of the above-described battery cell protection circuit embodiments are all applicable to the embodiments of this electronic device. The specific functions implemented by the embodiments of this electronic device are the same as those of the above-described battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-described battery cell protection circuit embodiments. Attached Figure Description

[0044] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0045] Figure 1 is a schematic diagram of the battery cell protection circuit provided in an embodiment of this application;

[0046] Figure 2 is another structural schematic diagram of the battery cell protection circuit provided in an embodiment of this application;

[0047] Figure 3 is another structural schematic diagram of the battery cell protection circuit provided in an embodiment of this application;

[0048] Figure 4 is another structural schematic diagram of the battery cell protection circuit provided in an embodiment of this application;

[0049] Figure 5 is another structural schematic diagram of the battery cell protection circuit provided in an embodiment of this application;

[0050] Figure 6 is a schematic diagram of the structure of the multi-pole battery cell provided in the embodiment of this application;

[0051] Figure 7 is another structural schematic diagram of the multi-pole battery cell provided in the embodiment of this application.

[0052] Reference numerals: Cell positive electrode input interface 110, Cell negative electrode input interface 120, Positive output connector 130, Negative output connector 140, First negative electrode connection resistor 191, Second negative electrode connection resistor 192, First positive electrode connection resistor 193, Second positive electrode connection resistor 194, First filter capacitor 195, Second filter capacitor 196; First charging switch module 170, First charging control terminal 171 and First discharging control terminal 172, First discharging switch module 180, Second charging control terminal 181 and Second discharging control terminal 182, First protection integrated unit 150, First power supply positive pin 151, First power supply negative pin 152, First current sensing pin 153, First over-discharge detection pin 154, First voltage detection pin 155, First switch control pin 156. The second protection integrated unit 160 includes a second power supply positive pin 161, a second power supply negative pin 162, a second current sensing pin 163, a second over-discharge detection pin 164, a second voltage detection pin 165, and a second switch control pin 166; a first positive contact 111, a second positive contact 112, a first negative contact 121, and a second negative contact 122; a multi-tab battery cell 200 includes a main body 210, a first positive tab 221, a second positive tab 222, a negative tab 230, a positive electrode plate 240, a negative electrode plate 250, positive tab adhesive 2211, and negative tab adhesive 2301. Detailed Implementation

[0053] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0054] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., 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 application 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 application.

[0055] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0057] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0058] Multitab cells, due to their unique design, can offer lower internal resistance and higher power density, making them increasingly popular in high-performance battery applications. However, related technologies present some challenges and issues in protecting multitab cells.

[0059] First, due to the complex structure of multi-tab batteries, effectively monitoring and controlling the current or voltage corresponding to each tab has become a technical challenge. Traditional battery protection circuits are ill-suited to the complexity of multi-tab batteries, resulting in insufficiently precise or comprehensive protection measures.

[0060] Secondly, the parallel structure of multi-tab cells can lead to uneven current distribution within the battery, which can affect battery performance and lifespan. If the cell protection circuit cannot accurately detect this uneven current distribution and take appropriate measures, it can cause some tabs to overheat or overload, thus affecting the overall battery performance.

[0061] Furthermore, the cell protection circuit design for multi-tab batteries also needs to consider heat dissipation. Since multi-tab batteries generate significant heat in high-power applications, the cell protection circuit must effectively manage this heat to prevent overheating. However, current cell protection circuits lack sufficient heat dissipation design or their heat dissipation efficiency is inadequate to handle the heat generated by multi-tab batteries under high loads.

[0062] Finally, the cell protection circuit for multi-tab batteries also needs to possess high reliability and stability. In high-vibration or shock applications, the cell protection circuit must be able to operate stably, unaffected by external environmental factors. Related technologies still have shortcomings in this regard and require further improvement and optimization.

[0063] In summary, the main problems with related technologies in the protection of multi-tab cells include how to accurately monitor and control the complex multi-tab structure, solve the problem of uneven current distribution, effectively manage heat dissipation, and improve the reliability and stability of cell protection circuits.

[0064] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a cell protection circuit, a multi-tab cell, a battery, and an electronic device, which can monitor the current or voltage at the tabs of the multi-tab cell, thereby promptly cutting off the circuit when an abnormality is detected to protect the battery from damage.

[0065] The following explanation is based on the accompanying drawings.

[0066] Referring to Figure 1, the cell protection circuit according to an embodiment of this application is used to protect multi-tab cells, including:

[0067] The positive electrode input interface 110 is used to connect the positive electrode of a multi-electrode battery cell;

[0068] The negative electrode input interface 120 is used to connect the negative electrode of a multi-electrode battery cell;

[0069] The battery cell protection circuit of this application provides a comprehensive and detailed protection scheme for the protection needs of multi-tab batteries. The circuit design includes a positive tab input interface 110 and a negative tab input interface 120, which are used to connect the positive and negative tabs of the multi-tab battery cell, respectively, ensuring that the battery cell protection circuit can be directly and effectively connected to the multi-tab battery cell.

[0070] Positive output connector 130 is connected to the positive electrode input interface 110 of the battery cell;

[0071] The negative output connector 140 is connected to the negative electrode input interface 120 of the battery cell via the negative protection branch;

[0072] Among them, the negative protection branch has a first negative connection resistor 191, a second negative connection resistor 192, a first charging switch module 170 and a first discharging switch module 180 connected in series between the negative output connector 140 and the negative electrode ear input interface 120 of the battery cell. The first charging switch module 170 is provided with a first charging control terminal 171 and a first discharging control terminal 172, and the first discharging switch module 180 is provided with a second charging control terminal 181 and a second discharging control terminal 182.

[0073] It should be noted that the positive output connector 130 and the negative output connector 140 are connected to the positive and negative tab input interfaces of the multi-tab battery cell through the positive protection branch and the negative protection branch, respectively. This design allows the protection circuit to independently protect the positive and negative poles of the multi-tab battery cell, improving the flexibility and effectiveness of the protection. In particular, in the negative protection branch, the first negative connection resistor 191, the second negative connection resistor 192, the first charging switch module 170, and the first discharging switch module 180 are connected in series in sequence. This sequential series configuration not only allows the battery cell protection circuit of this application to precisely control the current, but also provides multiple control points so that the circuit can be cut off in time when an abnormality is detected, protecting the multi-tab battery cell from damage.

[0074] In addition, the first charging switch module 170 is provided with a first charging control terminal 171 and a first discharging control terminal 172, and the first discharging switch module 180 is provided with a second charging control terminal 181 and a second discharging control terminal 182. It should be noted that the first charging switch module 170 and the first discharging switch module 180 each have independent control terminals, which allows the cell protection circuit to respond more flexibly to different abnormal situations.

[0075] A protection integrated unit, also known as a protection IC, is an electronic component specifically designed to monitor and control the battery's operating state. Its main function is to ensure the battery operates under safe conditions, preventing damage from abnormal situations such as overcharging, over-discharging, overcurrent, or short circuits. Protection ICs typically integrate multiple protection functions, enabling real-time monitoring of key battery parameters and taking appropriate protective measures when anomalies are detected.

[0076] The first protection integrated unit 150 is provided with a first power supply positive pin 151, a first power supply negative pin 152, a first current sensing pin 153, a first over-discharge detection pin 154, a first voltage detection pin 155 and a first switch control pin 156.

[0077] The first power positive pin 151 is connected to the positive electrode input interface 110 of the battery cell, the first power negative pin 152 is connected to the negative electrode input interface 120 of the battery cell, the first current sensing pin 153 is connected between the first negative electrode connection resistor 191 and the second negative electrode connection resistor 192, the first over-discharge detection pin 154 is connected to the first charging control terminal 171, the first voltage detection pin 155 is connected to the first discharge control terminal 172, and the first switch control pin 156 is located between the first charging switch module 170 and the first discharge switch module 180.

[0078] It should be understood that the first protection integrated unit 150 is a key component of the cell protection circuit in the embodiments of this application. It is responsible for monitoring and managing the negative protection branch of the multi-tab cell. The first protection integrated unit 150 includes multiple key pins, each with its specific function and connection point, which together ensure the safe and stable operation of the multi-tab cell.

[0079] The first power supply positive pin 151 is directly connected to the positive tab input interface 110 of the battery cell, providing the necessary operating voltage for the first protection integrated unit 150. The first power supply negative pin 152 is connected to the negative tab input interface 120 of the battery cell, completing the circuit loop. The configuration of these two pins ensures that the first protection integrated unit 150 can accurately monitor the voltage status of the multi-tab battery cell.

[0080] The first current sensing pin 153 is connected between the first negative terminal access resistor 191 and the second negative terminal access resistor 192. This design allows the first protection integrated unit 150 to calculate the current flowing through the multi-tab cell by monitoring the voltage drop across the resistor, enabling real-time monitoring of the current in the multi-tab cell. This current monitoring helps prevent overcurrent situations, as overcurrent can damage the multi-tab cell.

[0081] The first over-discharge detection pin 154 is connected to the first charging control terminal 171. This configuration enables the first protection integrated unit 150 to cut off the circuit by controlling the first charging switch module 170 when the voltage of the multi-tab battery cell is lower than the preset safety threshold, thereby preventing the multi-tab battery cell from over-discharging.

[0082] The first voltage detection pin 155 is connected to the first discharge control terminal 172. When the detected current exceeds the preset value, the first protection integrated unit 150 can control the first discharge switch module 180 to disconnect the circuit to protect the multi-pole battery cell from overcurrent damage.

[0083] The first switch control pin 156 is located between the first charging switch module 170 and the first discharging switch module 180. This design provides direct monitoring of the state of the first charging switch module 170, ensuring that the first charging switch module 170 can correctly respond to the control signals of the first protection integrated unit 150. This monitoring mechanism helps maintain the stability and reliability of the entire circuit.

[0084] The second protection integrated unit 160 is provided with a second power supply positive pin 161, a second power supply negative pin 162, a second current sensing pin 163, a second over-discharge detection pin 164, a second voltage detection pin 165, and a second switch control pin 166.

[0085] Specifically, the second power supply positive pin 161 is connected to the positive electrode input interface 110 of the battery cell, the second power supply negative pin 162 is connected between the first negative electrode access resistor 191 and the second negative electrode access resistor 192, the second current sensing pin 163 is connected between the second negative electrode access resistor 192 and the first charging switch module 170, the second over-discharge detection pin 164 is connected to the second charging control terminal 181, the second voltage detection pin 165 is connected to the second discharge control terminal 182, and the second switch control pin 166 is located between the first discharge switch module 180 and the negative output connector 140.

[0086] The second protection integrated unit 160 plays a crucial role in the cell protection circuit of this embodiment. It works in conjunction with the first protection integrated unit 150 to ensure the safe and stable operation of the multi-tab cell. The second protection integrated unit 160 also includes a series of key pins, each of which performs a specific function to achieve comprehensive protection of the cell negative tab input interface 120.

[0087] The second power supply positive pin 161 is directly connected to the positive electrode input interface 110 of the battery cell, providing the necessary operating voltage for the second protection integrated unit 160 and ensuring that its internal circuitry can operate normally. The second power supply negative pin 162 is connected between the first negative electrode access resistor 191 and the second negative electrode access resistor 192. This connection method allows the second protection integrated unit 160 to monitor and control the current in the negative path.

[0088] The second current sensing pin 163 is connected between the second negative terminal access resistor 192 and the first charging switch module 170. This design allows the second protection integrated unit 160 to monitor the current flowing through the multiplying battery cell by sensing the voltage drop across the resistor, thereby achieving precise current control. This is crucial for preventing overcurrent situations, as overcurrent can cause irreversible damage to the multiplying battery cell.

[0089] The second over-discharge detection pin 164 is connected to the second charging control terminal 181. This configuration enables the second protection integrated unit 160 to cut off the circuit by controlling the third switch module when the voltage in the multi-tab cell is lower than the preset safety threshold, thereby preventing the multi-tab cell from over-discharging.

[0090] The second voltage detection pin 165 is connected to the second discharge control terminal 182. When the detected current exceeds the preset value, the second protection integrated unit 160 can control the fourth switch module to disconnect the circuit to protect the multi-pole battery cell from overcurrent damage.

[0091] The second switch control pin 166 is located between the first discharge switch module 180 and the negative output connector 140. This design provides direct monitoring of the status of the first discharge switch module 180, ensuring that the first discharge switch module 180 can correctly respond to the control signals of the second protection integrated unit 160. This monitoring mechanism helps maintain the stability and reliability of the entire circuit.

[0092] Based on the above embodiments, the cell protection circuit of this application can more effectively cope with the complexity of multi-tab cells, provide comprehensive and accurate protection measures, and ensure the safe operation of multi-tab cells under various working conditions.

[0093] Referring to FIG2, according to some embodiments of the present application, the first charging switch module 170 includes two field-effect transistors connected in series through the source and drain. In the first charging switch module 170, the first charging control terminal 171 refers to the gate of the field-effect transistor near the side of the second negative terminal access resistor 192, and the first discharging control terminal 172 refers to the gate of the field-effect transistor near the side of the first discharging switch module 180.

[0094] In some embodiments of this application, the first charging switch module 170 is designed with two field-effect transistors connected in series. This configuration allows for more precise control of the negative protection branch. A field-effect transistor is a voltage-controlled device that operates by applying a voltage to the gate to control the current flow between the source and drain. In the first charging switch module 170, the sources and drains of the two field-effect transistors are connected in series to form an electronic switch, i.e., the first charging switch module 170.

[0095] The first charging control terminal 171 refers to the gate of the field-effect transistor (FET) in the first charging switch module 170, located near the second negative terminal access resistor 192. This means that by applying an appropriate voltage to this gate, the conduction state of the FET can be controlled, thereby affecting the switching state of the entire first charging switch module 170. When this FET is turned on, current can flow through the first charging switch module 170 and continue along the negative terminal protection branch to the negative terminal output connector 140. Conversely, when this FET is turned off, current flow is blocked, thereby cutting off the negative terminal protection branch.

[0096] The first discharge control terminal 172 refers to the gate of the field-effect transistor in the first charging switch module 170, located near the first discharge switch module 180. The function of this first discharge control terminal 172 is similar to that of the first charging control terminal 171, but it controls another field-effect transistor in the first charging switch module 170. By applying a voltage to the first discharge control terminal 172, the conduction and cutoff of the other field-effect transistor in the first charging switch module 170 can be controlled, further controlling whether current can pass through the first charging switch module 170.

[0097] This embodiment allows for more precise control of the negative terminal of the multi-tab battery cell by the battery cell protection circuit, as it provides two independent field-effect transistors (FETs) that act as switches, capable of operating separately or simultaneously under different conditions. For example, in the event of over-discharge or overcurrent detection, the battery cell protection circuit can cut off the current by controlling the gate voltage of these two FETs, thereby protecting the multi-tab battery cell from damage. In this way, the first charging switch module 170 provides an efficient and reliable current control mechanism for the battery cell protection circuit.

[0098] According to some embodiments of this application, the first discharge switch module 180 includes two field-effect transistors connected in series through the source and drain. In the first discharge switch module 180, the second charging control terminal 181 refers to the gate of the field-effect transistor on the side closer to the first charging switch module 170, and the second discharge control terminal 182 refers to the gate of the field-effect transistor on the side closer to the negative output connector 140.

[0099] In some embodiments of this application, the design of the first discharge switch module 180 can also employ two field-effect transistors connected in series. This configuration is similar to that of the first charging switch module 170, and is intended to provide an additional control point for the negative protection branch of the multi-tab battery cell. In the first discharge switch module 180, the source and drain of the two field-effect transistors are connected in series to form another electronic switch, namely the first discharge switch module 180.

[0100] The second charging control terminal 181 refers to the gate of the field-effect transistor (FET) in the first discharge switch module 180, located near the first charging switch module 170. The function of this second charging control terminal 181 is to control the conduction state of the FET by applying an appropriate voltage, thereby affecting the switching state of the entire first discharge switch module 180. When this FET is on, current can flow through the first discharge switch module 180 and continue along the negative protection branch to the negative output connector 140. Conversely, when this FET is off, current flow is blocked, thus cutting off a portion of the negative protection branch.

[0101] The second discharge control terminal 182 refers to the gate of the field-effect transistor in the first discharge switch module 180, located near the negative output connector 140. This second discharge control terminal 182 controls another field-effect transistor in the first discharge switch module 180. By applying a voltage to the second discharge control terminal 182, the conduction and cutoff of the second field-effect transistor can be controlled, further controlling whether current can pass through the first discharge switch module 180.

[0102] This application embodiment allows for more precise control of the negative protection branch of a multi-tab battery cell by the cell protection circuit, as it provides two independent field-effect transistors (FETs) that act as switches, capable of operating separately or simultaneously under different conditions. For example, in the event of over-discharge or overcurrent detection, the protection circuit can cut off the current by controlling the gate voltage of these two FETs, thereby protecting the battery cell from damage. Furthermore, this design increases the circuit's flexibility, as the two switch control terminals can operate independently to adapt to different protection requirements and strategies. In this way, the first discharge switch module 180 provides an efficient and reliable current control mechanism for the cell protection circuit.

[0103] It should be understood that the first discharge switch module 180 and the first charging switch module 170 together form a dual protection system, which can provide protection under different fault conditions, ensuring the safety and stability of the multi-tab battery cell under various operating conditions. This design not only improves battery safety but also helps to extend battery life and reduce equipment downtime and maintenance costs caused by battery failure.

[0104] Referring to Figure 3, according to some embodiments of this application, the first power positive pin 151 is connected to the cell positive tab input interface 110 through the first positive access resistor 193, and the second power positive pin 161 is connected to the cell positive tab input interface 110 through the second positive access resistor 194.

[0105] In some embodiments of this application, the first positive power supply pin 151 and the second positive power supply pin 161 of the cell protection circuit are connected to the positive tab input interface 110 of the cell through a first positive connection resistor 193 and a second positive connection resistor 194, respectively. It should be noted that by introducing a positive connection resistor between the corresponding positive power supply pin and the positive tab input interface 110, sudden changes in current can be limited, reducing voltage spikes in the circuit. This current limiting effect helps protect the multi-tab cell and circuit from transient currents, especially during circuit startup or sudden load changes. Secondly, the positive connection resistor can also serve as a current sensing point. By monitoring the voltage drop across the positive connection resistor, the cell protection circuit of this application embodiment can calculate the current flowing through the multi-tab cell, thereby achieving overcurrent protection. This real-time current monitoring is crucial for preventing cell damage due to overcurrent. Furthermore, this design helps to distribute current evenly, especially in multi-tab cells, where multiple positive tabs can provide lower internal resistance and higher power density. By using an independent positive terminal connection resistor on each power positive pin, the current can be ensured to be evenly distributed among the multiple positive terminals of the multi-tab cell, thereby improving the battery's efficiency and performance.

[0106] As can be seen, by introducing a positive connection resistor between the positive power supply pin and the positive tab input interface 110 of the battery cell, the embodiments of this application not only improve the safety and stability of the battery cell protection circuit, but also help optimize the performance and lifespan of the multi-tab battery cell.

[0107] Referring to Figure 4, according to some embodiments of this application, a first filter capacitor 195 is connected in parallel across the first negative terminal access resistor 191, and a second filter capacitor 196 is connected in parallel across the second negative terminal access resistor 192.

[0108] In some embodiments of this application, a first filter capacitor 195 is configured across the first negative terminal connection resistor 191 of the cell protection circuit, and a second filter capacitor 196 is configured across the second negative terminal connection resistor 192. This configuration aims to achieve better current stability and noise suppression in the negative terminal protection branch of the multi-tab cell.

[0109] It should be noted that the first filter capacitor 195 and the second filter capacitor 196 serve to smooth voltage fluctuations and filter out high-frequency noise. When current flows through the first negative terminal connected to the resistor 191 or the second negative terminal connected to the resistor 192, some high-frequency noise may be generated. If this noise is not suppressed, it may affect the normal operation of the circuit and may even trigger the malfunction of the cell protection circuit. By connecting filter capacitors in parallel across the first negative terminal connected to the resistor 191 and the second negative terminal connected to the resistor 192, this noise can be effectively reduced, providing a more stable current environment, thereby protecting the cell from the effects of transient current fluctuations.

[0110] Referring to FIG5, according to some embodiments of the present application, the positive tab input interface 110 of the battery cell includes at least two positive contacts (e.g., a first positive contact 111 and a second positive contact 112) for connecting at least two positive tabs of a multi-tab battery cell.

[0111] In addition, according to some embodiments of this application, the battery cell negative electrode input interface 120 includes at least two negative electrode contacts (e.g., a first negative electrode contact 121 and a second negative electrode contact 122) for connecting at least two negative electrodes of a multi-electrode battery cell.

[0112] It should be noted that the design of multi-tab cells aims to reduce the internal resistance of the cell and improve its current carrying capacity by increasing the number of tabs, which is particularly important for high-performance battery applications. However, as the number of tabs increases, the protection and monitoring of the cell also become more complex.

[0113] It should be noted that the positive tab input interface 110 of the battery cell may include two or more positive contacts. This design allows direct connection of at least two positive tabs of a multi-tab battery cell. Multi-tab batteries, due to their unique design, can provide lower internal resistance and higher power density. By providing multiple positive contacts, the battery cell protection circuit can better adapt to the structure of the multi-tab battery cell, achieving comprehensive protection. This design not only ensures that the current can be evenly distributed across the multiple positive tabs of the battery cell, but also helps improve battery efficiency and performance. At the same time, the design of multiple positive contacts also provides more flexibility for the battery cell protection circuit, enabling it to adapt to multi-tab battery cells with different configurations, enhancing the circuit's versatility and applicability.

[0114] It should be noted that the design of the negative tab input interface 120 also takes into account the characteristics of multi-tab cells, including at least two negative contacts for connecting at least two negative tabs of the multi-tab cell. This design allows the cell protection circuit to establish connections with multiple negative tabs of the multi-tab cell, thereby achieving comprehensive protection and monitoring of the multi-tab cell. The advantage of this design is that it allows current to be evenly distributed among the multiple negative tabs of the cell, reducing the current load on individual negative tabs and thus reducing the risk of overheating and overload. Furthermore, the multiple negative contact design also helps improve the charging and discharging efficiency of multi-tab cells because current can flow into and out of the cell more evenly.

[0115] As can be seen, the cell protection circuit of this application, by providing multiple positive contacts at the positive tab input interface, or by including at least two negative contacts at the negative tab input interface 120, not only improves the safety and reliability of the cell protection circuit, but also helps to optimize the performance and service life of multi-tab cells.

[0116] According to embodiments of this application, a multi-pole battery cell includes:

[0117] The main body includes a positive electrode plate and a negative electrode plate, and the main body is composed of a positive electrode plate and a negative electrode plate;

[0118] At least one positive electrode tab is electrically connected to the positive electrode plate;

[0119] At least one negative electrode tab is electrically connected to the negative electrode plate;

[0120] The battery cell protection circuit of this application embodiment; wherein, the positive electrode input interface of the battery cell protection circuit is connected to the positive electrode, and the negative electrode input interface is connected to the negative electrode.

[0121] It should be noted that the multi-tab battery cell includes: a main body, at least one positive tab, at least one negative tab, and a battery cell protection circuit according to embodiments of this application. The main body may include a positive electrode and a negative electrode, and the main body is composed of a positive electrode and a negative electrode. Specifically, the positive electrode is usually made by coating a conductive current collector with an active material having a high energy density. The active material is such as lithium cobalt oxide, nickel-cobalt-manganese ternary material, or lithium iron phosphate, etc., and the conductive current collector may be such as aluminum foil. The negative electrode often uses graphite or silicon-carbon composite materials as active materials, which are coated on a current collector such as copper foil.

[0122] Referring to Figures 6 and 7, in some specific embodiments, the multi-tab battery cell 200 includes: a main body 210, a first positive tab 221, a second positive tab 222, and a negative tab 230. The main body 210 includes a positive electrode sheet 240 and a negative electrode sheet 250, which are formed by stacking and winding the positive electrode sheet 240 and the negative electrode sheet 250. Specifically, the positive electrode sheet 240 is usually made by coating a conductive current collector with an active material with high energy density, such as lithium cobalt oxide, nickel-cobalt-manganese ternary materials, or lithium iron phosphate, and the conductive current collector can be, for example, aluminum foil. The negative electrode sheet 250 is mostly formed by coating a current collector such as copper foil with graphite or silicon-carbon composite material as the active material.

[0123] In this process, after the positive electrode 240 and negative electrode 250 are stacked in the thickness direction of the positive electrode 240, the same end of the positive electrode 240 and negative electrode 250 are wound to form the main body 210. The tabs include positive and negative tabs 230. During charging, an external power source inputs electrical energy into the multi-tab battery cell 200 through the positive tab, causing lithium ions to be extracted from the positive electrode material and migrate to the negative electrode through the electrolyte. During discharging, lithium ions are extracted from the negative electrode material, return to the positive electrode through the electrolyte, and release electrical energy. This process also requires the transmission of electrical energy to the external circuit through the positive tab. In this application, the positive tab includes a first positive tab 221 and a second positive tab 222. The first positive tab 221 is electrically connected to the positive electrode 240, and the second positive tab 222 is electrically connected to the positive electrode 240. The number of the first positive electrode tab 221 and the second positive electrode tab 222 is not specifically limited. For example, the number of the first positive electrode tab 221 can be one, two, or more, and the number of the second positive electrode tab 222 can be one, two, or more. The first positive electrode tab 221 is electrically connected to the positive electrode plate 240, specifically by welding the first positive electrode tab 221 to the positive electrode plate 240. The second positive electrode tab 222 is electrically connected to the positive electrode plate 240, specifically by welding the second positive electrode tab 222 to the positive electrode plate 240. The negative electrode tab 230 is electrically connected to the negative electrode plate 250, and the number of the negative electrode tab 230 can be one. The negative electrode tab 230 is electrically connected to the negative electrode plate 250, specifically by welding the negative electrode tab 230 to the negative electrode plate 250. The first positive electrode tab 221 and the negative electrode tab 230 are located on opposite sides of the width direction of the second positive electrode tab 222. Specifically, when the multi-tab battery cell 200 is charging, external current enters the multi-tab battery cell 200 from the positive terminal. Specifically, after the multi-tab battery cell 200 is provided with a first positive tab 221 and a second positive tab 222, external current can enter the multi-tab battery cell 200 from both the first positive tab 221 and the second positive tab 222. In the prior art, the multi-tab battery cell 200 has only one positive tab, so the current enters the multi-tab battery cell 200 slowly. However, in this application, the current can enter the multi-tab battery cell 200 from both the first positive tab 221 and the second positive tab 222, thus enabling the multi-tab battery cell 200 to charge faster. In other words, the multi-tab battery cell 200 can be charged quickly.

[0124] Furthermore, by setting the first positive tab 221 and the second positive tab 222, during the charging process of the multi-tab battery cell 200, the first positive tab 221 and the second positive tab 222 can also jointly shunt the current, thereby preventing the temperature of the multi-tab battery cell 200 from becoming too high. In addition, the setting of the first positive tab 221 and the second positive tab 222 can also reduce the internal resistance of the multi-tab battery cell 200. Further, the first positive tab 221 and the negative tab 230 are respectively located on both sides of the width direction of the second positive tab 222. Compared to the setting where the first positive tab 221 and the second positive tab 222 are respectively located on both sides of the negative tab 230, the former is safer and makes it easier for the multi-tab battery cell 200 to effectively avoid the risk of short circuits.

[0125] Further referring to Figures 1 to 3, in some embodiments, the first positive electrode tab 221 and the second positive electrode tab 222 are respectively located in different layers of the main body 210. Specifically, as mentioned above, the main body 210 includes a positive electrode sheet 240 and a negative electrode sheet 250. After the positive electrode sheet 240 and the negative electrode sheet 250 are stacked, they are wound to form the main body 210. Therefore, the positive electrode sheet 240 on the main body 210 will have multiple layers. The first positive electrode tab 221 can be located on the outermost positive electrode sheet 240, or the first positive electrode tab 221 can be located on the middle layer of the positive electrode sheet 240, or the first positive electrode tab 221 can be located on the innermost positive electrode sheet 240. The second positive electrode tab 222 can be located on the outermost positive electrode sheet 240, or the second positive electrode tab 222 can be located on the middle layer of the positive electrode sheet 240, or the second positive electrode tab 222 can be located on the innermost positive electrode sheet 240. The first positive tab 221 and the second positive tab 222 are located after different layers of the main body 210. When the multi-tab battery cell 200 is charged, the first positive tab 221 and the second positive tab 222 can diffuse the current to different layers of the positive electrode 240. Compared with the arrangement that the first positive tab 221 and the second positive tab 222 are located in the same layer of the main body 210, the arrangement that the first positive tab 221 and the second positive tab 222 are located in different layers of the main body 210 can improve the charging speed and make the charging speed of the multi-tab battery cell 200 faster.

[0126] Furthermore, in some embodiments, the negative electrode tab 230 is connected to the middle position of the negative electrode sheet 250. That is, both sides of the negative electrode sheet 250 have negative electrode active material layers, and a groove is provided in the middle position of the negative electrode active material layers, with the negative electrode tab 230 disposed in the groove. Specifically, after the negative electrode tab 230 is located in the middle position of the negative electrode sheet 250, when the negative electrode sheet 250 is charged, the current can diffuse from the middle position of the negative electrode sheet 250 to all positions of the negative electrode sheet 250, which greatly improves the charging speed of the negative electrode sheet 250.

[0127] In some embodiments, the multi-tab battery cell 200 may further include two positive electrode adhesives 2211, which are respectively attached to the first positive electrode tab 221 and the second positive electrode tab 222. The main function of the positive electrode adhesives 2211 is insulation, preventing direct contact between the tabs and other parts of the battery (such as the aluminum-plastic film) that could lead to a short circuit. During battery packaging, the positive electrode adhesives 2211 are heat-sealed and bonded to the aluminum-plastic film, forming an effective insulating barrier to ensure safe battery operation. Thus, the attachment of the two positive electrode adhesives 2211 to the first positive electrode tab 221 and the second positive electrode tab 222 respectively improves battery safety. The multi-tab battery cell 200 also includes a negative electrode adhesive 2301, which is attached to the negative electrode tab 230.

[0128] In some embodiments of this application, the first positive electrode tab is electrically connected to the positive electrode plate, specifically by soldering it to the positive electrode plate. The negative electrode tab is electrically connected to the negative electrode plate, specifically by soldering the negative electrode tab to the negative electrode plate.

[0129] The contents of the above-described battery cell protection circuit embodiments are all applicable to the embodiments of this multi-tab battery cell. The specific functions implemented by this multi-tab battery cell embodiment are the same as those of the above-described battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-described battery cell protection circuit embodiments.

[0130] The battery according to an embodiment of this application includes:

[0131] The casing has a storage cavity;

[0132] As in the embodiments of this application, a multi-tab battery cell is disposed in a storage cavity; wherein, the positive tab and the negative tab of the multi-tab battery cell extend outward from the storage cavity.

[0133] The contents of the above-described battery cell protection circuit embodiments are all applicable to the embodiments of this battery. The specific functions implemented by the embodiments of this battery are the same as those of the above-described battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-described battery cell protection circuit embodiments.

[0134] An electronic device according to an embodiment of this application includes a battery as described in an embodiment of this application.

[0135] The contents of the above-described battery cell protection circuit embodiments are all applicable to the embodiments of this electronic device. The specific functions implemented by the embodiments of this electronic device are the same as those of the above-described battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-described battery cell protection circuit embodiments.

[0136] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the core ideas of this application. The above are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make various improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the application to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A cell protection circuit, used to protect multi-tab cells, comprising: The positive electrode input interface is used to connect the positive electrode of the multi-electrode battery cell; The battery cell negative electrode input interface is used to connect the negative electrode of the multi-electrode battery cell; Positive output connector, connected to the positive electrode input interface of the battery cell; The negative output connector is connected to the negative electrode input interface of the battery cell via a negative protection branch; The negative protection branch is provided with a first negative connection resistor, a second negative connection resistor, a first charging switch module and a first discharging switch module connected in series between the negative output connector and the negative electrode input interface of the battery cell. The first charging switch module is provided with a first charging control terminal and a first discharging control terminal; The first discharge switch module is provided with a second charging control terminal and a second discharge control terminal; The first protection integrated unit is provided with a first power supply positive pin, a first power supply negative pin, a first current sensing pin, a first over-discharge detection pin, a first voltage detection pin, and a first switch control pin; Wherein, the first power positive pin is connected to the positive tab input interface of the battery cell, the first power negative pin is connected to the negative tab input interface of the battery cell, the first current sensing pin is connected between the first negative connection resistor and the second negative connection resistor, the first over-discharge detection pin is connected to the first charging control terminal, the first voltage detection pin is connected to the first discharging control terminal, and the first switch control pin is located between the first charging switch module and the first discharging switch module; The second protection integrated unit is provided with a second power supply positive pin, a second power supply negative pin, a second current sensing pin, a second over-discharge detection pin, a second voltage detection pin, and a second switch control pin; The second power positive pin is connected to the positive electrode input interface of the battery cell, the second power negative pin is connected between the first negative electrode connection resistor and the second negative electrode connection resistor, the second current sensing pin is connected between the second negative electrode connection resistor and the first charging switch module, the second over-discharge detection pin is connected to the second charging control terminal, the second voltage detection pin is connected to the second discharge control terminal, and the second switch control pin is located between the first discharge switch module and the negative electrode output connector.

2. The cell protection circuit according to claim 1, wherein The first charging switch module includes two field-effect transistors connected in series through their source and drain. In the first charging switch module, the first charging control terminal refers to the gate of the field-effect transistor near the side connected to the second negative terminal resistor, and the first discharging control terminal refers to the gate of the field-effect transistor near the side connected to the first discharging switch module.

3. The cell protection circuit according to claim 1 or 2, wherein The first discharge switch module includes two field-effect transistors connected in series through their source and drain. In the first discharge switch module, the second charging control terminal refers to the gate of the field-effect transistor on the side closer to the first charging switch module, and the second discharge control terminal refers to the gate of the field-effect transistor on the side closer to the negative output connector.

4. The cell protection circuit of claim 1, wherein, The first power positive pin is connected to the positive tab input interface of the battery cell through a first positive connection resistor, and the second power positive pin is connected to the positive tab input interface of the battery cell through a second positive connection resistor.

5. The cell protection circuit according to claim 1 or 4, wherein A first filter capacitor is connected in parallel across the first negative terminal resistor, and a second filter capacitor is connected in parallel across the second negative terminal resistor.

6. The cell protection circuit of claim 1, wherein, The positive tab input interface of the battery cell includes at least two positive contacts for connecting at least two of the positive tabs of the multi-tab battery cell.

7. The cell protection circuit according to claim 1 or 6, wherein The cell negative electrode input interface includes at least two negative electrode contacts for connecting at least two of the negative electrodes of the multi-electrode cell.

8. Multi-pole battery cells, including: The main body includes a positive electrode plate and a negative electrode plate, and the main body is composed of the positive electrode plate and the negative electrode plate; At least one positive electrode tab, the at least one positive electrode tab being electrically connected to the positive electrode plate; At least one negative electrode tab, the at least one negative electrode tab being electrically connected to the negative electrode plate; The battery cell protection circuit according to any one of claims 1 to 7; wherein the positive electrode input interface of the battery cell protection circuit is connected to the positive electrode, and the negative electrode input interface is connected to the negative electrode.

9. Battery, including: The casing has a storage cavity; The multi-tab battery cell as described in claim 8 is disposed in the storage cavity; wherein the positive tab and the negative tab of the multi-tab battery cell extend outward from the storage cavity.

10. An electronic device, including the battery as claimed in claim 9.

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