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

Abstract

The utility model relates to the technical field of electric appliance structures, in particular to a battery cell protection circuit, a multi-tab battery cell, a battery and electronic equipment. The battery cell protection circuit is specially designed for a multi-tab battery cell, and the compatibility with the battery cell is ensured by arranging the positive and negative tab input interfaces. The positive and negative electrode output connectors are respectively connected with the input interface through the protection branch circuits, thereby achieving the precise control and protection of the current. In the negative electrode protection branch, two negative electrode access resistors are connected in series with two switch modules, and the functions of current monitoring and abnormal cut-off are provided. Wherein each switch module is provided with an independent control end, and charging current, discharging current and battery cell voltage are allowed to be detected respectively. The first protection integration unit and the second protection integration unit are used for monitoring the state of the battery cell and controlling the first charging switch module or the first discharging switch module to cut off a circuit in time when the state of the battery cell is abnormal, so that the battery is protected from being damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric appliance structure, in particular to a battery cell protection circuit, a multi-tab battery cell, a battery and an electronic device. BACKGROUND

[0002] With the development of battery technology, the types, performance and working conditions of batteries are constantly changing. Multi-tab battery cells can provide lower internal resistance and higher power density due to their unique design, which makes them increasingly popular in high-performance battery applications. However, there are some challenges and problems in the related art in protecting multi-tab battery cells.

[0003] Since the multi-tab battery cell has a relatively complex structure, how to effectively monitor and control the current or voltage corresponding to each tab becomes a technical problem. The traditional battery cell protection circuit is difficult to adapt to the complexity of the multi-tab battery cell, resulting in inaccurate or incomplete protection measures. Therefore, how to monitor the current or voltage of the tab of the multi-tab battery cell to detect abnormal conditions and cut off the circuit in time to protect the battery from damage is still a problem to be solved in the industry. UTILITY MODEL CONTENT

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery cell protection circuit, a multi-tab battery cell, a battery and an electronic device, which can monitor the current or voltage of the tab of the multi-tab battery cell to detect abnormal conditions and cut off the circuit in time to protect the battery from damage.

[0005] The battery cell protection circuit according to the first aspect of the present application is applied to protect the multi-tab battery cell, and comprises:

[0006] a positive tab input interface for connecting the positive tab of the multi-tab battery cell;

[0007] a negative tab input interface for connecting the negative tab of the multi-tab battery cell;

[0008] a positive output connector connected to the positive tab input interface;

[0009] a negative output connector connected to the negative tab input interface through a negative protection branch;

[0010] The negative protection branch has a first negative access resistor, a second negative access resistor, a first charging switch module and a first discharging switch module connected in series between the negative output connector and the negative tab input interface, the first charging switch module is provided with a first charging control end and a first discharging control end, and the first discharging switch module is provided with a second charging control end and a second discharging control end.

[0011] The first protection integrated unit is provided with a first power positive pole pin, a first power negative pole pin, a first current sensing pin, a first over-discharge detection pin, the first voltage detection pin and a first switch control pin;

[0012] The first power positive pole pin is connected to the positive pole lug input interface of the battery cell, the first power negative pole pin is connected to the negative pole lug input interface of the battery cell, the first current sensing pin is connected between the first negative pole access resistor and the second negative pole access resistor, the first over-discharge detection pin is connected to the first charging control end, the first voltage detection pin is connected to the first discharging control end, and the first switch control pin is arranged between the first charging switch module and the first discharging switch module.

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

[0014] The second power positive pole pin is connected to the positive pole lug input interface of the battery cell, the second power negative pole pin is connected between the first negative pole access resistor and the second negative pole access resistor, the second current sensing pin is connected between the second negative pole access resistor and the first charging switch module, the second over-discharge detection pin is connected to the second charging control end, the second voltage detection pin is connected to the second discharging control end, and the second switch control pin is arranged between the first discharging switch module and the negative pole output connector.

[0015] The battery cell protection circuit according to the embodiment of the present application has at least the following beneficial effects:

[0016] The battery cell protection circuit according to the embodiment of the present application is provided with the positive pole lug input interface and the negative pole lug input interface for the positive pole lug and the negative pole lug of the multi-pole lug battery cell, which ensures the compatibility with the multi-pole lug battery cell. The positive pole output connector is connected to the positive pole lug input interface through the positive pole protection branch, and the negative pole output connector is connected to the negative pole lug input interface through the negative pole protection branch, which allows the battery cell protection circuit to accurately control and protect the output current.

[0017] In the negative protection branch, the first negative access resistor, the second negative access resistor, the first charging switch module and the first discharging switch module are connected in series. This configuration not only allows the output current of the negative electrode to be monitored, but also provides an additional control point to facilitate timely circuit shutdown when an abnormal situation is detected. The first charging switch module and the first discharging switch module each have an independent control end, which enables 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 ends 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 ends of the first discharging switch module. This design allows over-discharge and over-current to be monitored and controlled separately.

[0018] The introduction of the first and second protection integrated units further improves the protection capability of the battery cell protection circuit. Each protection integrated unit is equipped with corresponding positive and negative power supply pins, current sensing pins, over-discharge detection pins, voltage detection pins, and switch control pins. The configuration of these pins enables the protection integrated unit to comprehensively monitor the working state of the multi-tab battery cell, including voltage, current, and temperature. It is worth noting that the first current sensing pin is connected between the first negative access resistor and the second negative access resistor, and the second current sensing pin is connected between the second negative access resistor and the first charging switch module. In this way, the current flowing through the multi-tab battery cell can be accurately monitored. The over-discharge and voltage detection pins are connected to the control ends of the corresponding switch modules, enabling the protection integrated unit to cut off the circuit by controlling the corresponding switch module when an abnormal situation is detected, thereby protecting the multi-tab battery cell.

[0019] In addition, the first switch control pin is arranged between the first charging switch module and the first discharging switch module, and the second switch control pin is arranged between the first discharging switch module and the negative output connector, providing additional monitoring points for the battery cell protection circuit for the two switch modules, which helps to monitor the state of the switch module in real time and ensures the stability and reliability of the battery cell protection circuit.

[0020] Based on the above embodiments, the battery cell protection circuit of the present application can more effectively cope with the complexity of multi-tab battery cells, providing comprehensive and accurate protection measures to ensure the safe operation of multi-tab battery cells under various working conditions.

[0021] According to some embodiments of the present application, the first charging switch module includes two field effect transistors connected in series through a source and a drain. In the first charging switch module, the first charging control end refers to the gate of the field effect transistor close to the second negative access resistor, and the first discharging control end refers to the gate of the field effect transistor close to the first discharging switch module.

[0022] According to some embodiments of the present application, the first discharging switch module comprises two field effect transistors connected in series through a source and a drain, in the first discharging switch module, the second charging control end refers to a gate of a field effect transistor on a side close to the first charging switch module, and the second discharging control end refers to a gate of a field effect transistor on a side close to the negative electrode output connector.

[0023] According to some embodiments of the present application, the first power supply positive electrode pin is connected to the battery cell positive tab input interface through a first positive electrode access resistor, and the second power supply positive electrode pin is connected to the battery cell positive tab input interface through a second positive electrode access resistor.

[0024] According to some embodiments of the present application, a first filter capacitor is configured in parallel across the first negative electrode access resistor, and a second filter capacitor is configured in parallel across the second negative electrode access resistor.

[0025] According to some embodiments of the present application, the battery cell positive tab input interface comprises at least two positive electrode contacts for connecting at least two positive tabs of the multi-tab battery cell.

[0026] According to some embodiments of the present application, the battery cell negative tab input interface comprises at least two negative electrode contacts for connecting at least two negative tabs of the multi-tab battery cell.

[0027] The multi-tab battery cell according to the second aspect of the embodiments of the present application comprises:

[0028] a main body comprising a positive electrode sheet and a negative electrode sheet, the main body being composed of the positive electrode sheet and the negative electrode sheet;

[0029] at least one positive tab electrically connected to the positive electrode sheet;

[0030] at least one negative tab electrically connected to the negative electrode sheet;

[0031] The battery cell protection circuit according to any one of the first aspect of the embodiments of the present application; wherein the battery cell protection circuit is connected to the positive tab through the battery cell positive tab input interface, and is connected to the negative tab through the battery cell negative tab input interface.

[0032] The multi-tab battery cell according to the embodiments of the present application has at least the following beneficial effects:

[0033] The contents in the above-mentioned battery cell protection circuit embodiments are all applicable to the embodiments of the present multi-tab battery cell, the multi-tab battery cell embodiments specifically realize the same functions as the above-mentioned battery cell protection circuit embodiments, and achieve the same beneficial effects as the above-mentioned battery cell protection circuit embodiments.

[0034] The battery according to the third aspect of the present application comprises:

[0035] The shell has a storage cavity;

[0036] The multi-tab battery cell according to the second aspect of the present application is arranged in the storage cavity; wherein the positive tab and the negative tab of the multi-tab battery cell are arranged to extend outward from the storage cavity.

[0037] The battery according to the embodiments of the present application has at least the following beneficial effects:

[0038] The contents in the above battery cell protection circuit embodiments are all applicable to the embodiments of the present battery, the functions specifically realized by the battery embodiments are the same as those of the above battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those of the above battery cell protection circuit embodiments.

[0039] The electronic device according to the fourth aspect of the present application comprises the battery according to the third aspect of the present application.

[0040] The electronic device according to the embodiments of the present application has at least the following beneficial effects:

[0041] The contents in the above battery cell protection circuit embodiments are all applicable to the embodiments of the present battery, the functions specifically realized by the battery embodiments are the same as those of the above battery cell protection circuit embodiments, and the beneficial effects achieved are also the same as those of the above battery cell protection circuit embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0043] Figure 1 The structural schematic diagram of the battery cell protection circuit provided by the embodiments of the present application is shown in FIG. 1;

[0044] Figure 2 Another structural schematic diagram of the battery cell protection circuit provided by the embodiments of the present application is shown in FIG. 2;

[0045] Figure 3 Another structural schematic diagram of the battery cell protection circuit provided by the embodiments of the present application is shown in FIG. 3;

[0046] Figure 4 Another structural schematic diagram of the battery cell protection circuit provided by the embodiments of the present application is shown in FIG. 4;

[0047] Figure 5 Another structural schematic diagram of the battery cell protection circuit provided by the embodiments of the present application is shown in FIG. 5;

[0048] Figure 6A structure schematic diagram of a multi-tab battery cell provided for an embodiment of the present application is shown in FIG. 1.

[0049] Figure 7 Another structure schematic diagram of a multi-tab battery cell provided for an embodiment of the present application is shown in FIG. 2.

[0050] Reference signs:

[0051] A positive electrode tab input interface 110 of the battery cell, a negative electrode tab input interface 120,

[0052] A positive output connector 130, a negative output connector 140,

[0053] A first negative access resistor 191, a second negative access resistor 192, a first positive access resistor 193, a second positive access resistor 194, a first filter capacitor 195, and a second filter capacitor 196;

[0054] A first charging switch module 170, a first charging control end 171, and a first discharging control end 172,

[0055] A first discharging switch module 180, a second charging control end 181, and a second discharging control end 182,

[0056] A first protection integrated unit 150, 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,

[0057] A second protection integrated unit 160, 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;

[0058] A first positive contact 111, a second positive contact 112, a first negative contact 121, and a second negative contact 122;

[0059] A multi-tab battery cell 200, a main body 210, a first positive electrode tab 221, a second positive electrode tab 222, a negative electrode tab 230, a positive electrode tab 240, a negative electrode tab 250, a positive electrode tab rubber 2211, and a negative electrode tab rubber 2301. DETAILED DESCRIPTION

[0060] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent 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 the present application, and cannot be understood as a limitation of the present application.

[0061] In the description of the present application, it needs to be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0062] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0063] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0065] Multi-tab cells can provide lower internal resistance and higher power density due to their unique design, which makes them increasingly popular in high-performance battery applications. However, there are some challenges and problems in the related art in protecting multi-tab cells.

[0066] Firstly, since multi-tab cells have a relatively complex structure, how to effectively monitor and control the current or voltage corresponding to each tab becomes a technical problem. The traditional cell protection circuit is difficult to adapt to the complexity of multi-tab cells, resulting in inaccurate or incomplete protection measures.

[0067] Secondly, the parallel structure of multi-tab cells can cause uneven current distribution inside the battery, which can affect the performance and life of the battery. 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, thereby affecting the performance of the entire battery.

[0068] In addition, the cell protection circuit design of the multi-tab cell also needs to consider the heat dissipation problem. Since the multi-tab cell generates more heat in high-power applications, the cell protection circuit must be able to effectively manage the heat to prevent the battery from overheating. However, the related art cell protection circuit does not have sufficient heat dissipation design, or the heat dissipation efficiency is insufficient to cope with the heat generated by the multi-tab cell under high load.

[0069] Finally, the cell protection circuit of the multi-tab cell also needs to have high reliability and stability. In high-vibration or impact application environments, the cell protection circuit must be able to work stably and not be affected by the external environment. The related art still has deficiencies in this regard and needs further improvement and optimization.

[0070] In summary, the main problems in the related art 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 the cell protection circuit.

[0071] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present 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 tab of the multi-tab cell, thereby cutting off the circuit in time when an abnormal condition is detected, protecting the battery from damage.

[0072] Further explanation is made below with reference to the accompanying drawings.

[0073] Reference Figure 1 The cell protection circuit according to the embodiments of the present application is applied to protect the multi-tab cell, and comprises:

[0074] The cell positive tab input interface 110 is used to connect the positive tab of the multi-tab cell;

[0075] The cell negative tab input interface 120 is used to connect the negative tab of the multi-tab cell;

[0076] The cell protection circuit of the embodiments of the present application provides a comprehensive and detailed protection scheme for the protection needs of the multi-tab cell. The circuit design includes the cell positive tab input interface 110 and the cell negative tab input interface 120, which are respectively used to connect the positive tab and the negative tab of the multi-tab cell, ensuring that the cell protection circuit can be directly and effectively connected with the multi-tab cell.

[0077] The positive output connector 130 is connected to the cell positive tab input interface 110;

[0078] The negative output connector 140 is connected to the cell negative tab input interface 120 through the negative protection branch.

[0079] The negative electrode protection branch is connected between the negative electrode output connector 140 and the negative electrode tab input interface 120 of the multi-tab battery cell, and is sequentially connected with the first negative electrode access resistor 191, the second negative electrode access resistor 192, the first charging switch module 170, and the first discharging switch module 180. The first charging switch module 170 is provided with a first charging control end 171 and a first discharging control end 172, and the first discharging switch module 180 is provided with a second charging control end 181 and a second discharging control end 182.

[0080] It should be noted that the positive electrode output connector 130 and the negative electrode output connector 140 are respectively connected with the positive and negative electrode tab input interfaces of the multi-tab battery cell through the positive electrode protection branch and the negative electrode protection branch. This design allows the protection circuit to independently protect the positive and negative electrodes of the multi-tab battery cell, improving the flexibility and effectiveness of protection. In particular, in the negative electrode protection branch, the first negative electrode access resistor 191, the second negative electrode access resistor 192, the first charging switch module 170, and the first discharging switch module 180 are sequentially connected. This sequential connection not only allows the battery cell protection circuit of the present application to accurately control the current, but also provides multiple control points to allow the circuit to be promptly disconnected when an abnormal condition is detected, protecting the multi-tab battery cell from damage.

[0081] In addition, the first charging switch module 170 is provided with a first charging control end 171 and a first discharging control end 172, and the first discharging switch module 180 is provided with a second charging control end 181 and a second discharging control end 182. It should be noted that the first charging switch module 170 and the first discharging switch module 180 each have an independent control end, which allows the battery cell protection circuit to respond more flexibly to different abnormal conditions.

[0082] The protection integrated unit, also known as protection IC, can also be referred to as protection integrated circuit (Protection Integrated Circuit). It should be noted that the protection integrated unit is an electronic component specially designed to monitor and control the working state of the battery. Its main function is to ensure that the battery works in a safe condition and prevent the battery from being damaged due to abnormal conditions such as overcharging, overdischarging, overcurrent, or short circuit. The protection IC usually integrates multiple protection functions, can monitor the key parameters of the battery in real time, and take appropriate protection measures when an abnormality is detected.

[0083] The first protection integrated unit 150 is provided with a first power supply positive electrode pin 151, a first power supply negative electrode pin 152, a first current sensing pin 153, a first overdischarge detection pin 154, a first voltage detection pin 155, and a first switch control pin 156.

[0084] The first power positive pin 151 is connected to the positive tab input interface 110, the first power negative pin 152 is connected to the negative tab input interface 120, the first current sensing pin 153 is connected between the first negative access resistor 191 and the second negative access resistor 192, the first over-discharge detection pin 154 is connected to the first charge control end 171, the first voltage detection pin 155 is connected to the first discharge control end 172, and the first switch control pin 156 is arranged between the first charge switch module 170 and the first discharge switch module 180.

[0085] It should be understood that the first protection integrated unit 150 is a key component in the cell protection circuit of the embodiment of the application, which is responsible for monitoring and managing the negative protection branch of the multi-tab cell. The first protection integrated unit 150 includes a plurality of key pins, each pin has its specific function and connection point, which together ensures the safe and stable operation of the multi-tab cell.

[0086] The first power positive pin 151 is directly connected to the positive tab input interface 110, providing the necessary working voltage for the first protection integrated unit 150. The first power negative pin 152 is connected to the negative tab input interface 120, completing the circuit loop. The configuration of these two pins ensures that the first protection integrated unit 150 can accurately monitor the voltage state of the multi-tab cell.

[0087] The first current sensing pin 153 is connected between the first negative access resistor 191 and the second negative access resistor 192, which 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, achieving real-time monitoring of the current on the multi-tab cell. This current monitoring helps prevent overcurrent situations, which can damage the multi-tab cell.

[0088] The first over-discharge detection pin 154 is connected to the first charge control end 171, which allows the first protection integrated unit 150 to control the first charge switch module 170 to cut off the circuit when the voltage of the multi-tab cell is below the preset safety threshold, preventing over-discharge of the multi-tab cell.

[0089] The first voltage detection pin 155 is connected to the first discharge control end 172, which allows the first protection integrated unit 150 to control the first discharge switch module 180 to disconnect the circuit when the current exceeds the preset value, protecting the multi-tab cell from overcurrent damage.

[0090] The first switch control pin 156 is arranged 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 signal of the first protection integrated unit 150. This monitoring mechanism helps maintain the stability and reliability of the entire circuit.

[0091] The second protection integrated unit 160 is provided with a second positive supply pin 161, a second negative supply 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.

[0092] The second positive supply pin 161 is connected to the positive electrode ear input interface 110 of the battery cell, the second negative supply pin 162 is connected between the first negative access resistor 191 and the second negative access resistor 192, the second current sensing pin 163 is connected between the second negative access resistor 192 and the first charging switch module 170, the second over-discharge detection pin 164 is connected to the second charging control end 181, the second voltage detection pin 165 is connected to the second discharging control end 182, and the second switch control pin 166 is arranged between the first discharging switch module 180 and the negative output connector 140.

[0093] The second protection integrated unit 160 plays a crucial role in the battery cell protection circuit of the present application. It works in conjunction with the first protection integrated unit 150 to ensure the safe and stable operation of the multi-pole ear battery cell. The second protection integrated unit 160 also contains a series of key pins, each of which has a specific function to achieve comprehensive protection of the negative electrode ear input interface 120 of the battery cell.

[0094] The second positive supply pin 161 is directly connected to the positive electrode ear input interface 110 of the battery cell, providing the necessary operating voltage for the second protection integrated unit 160, ensuring that its internal circuit can operate normally. The second negative supply pin 162 is connected between the first negative access resistor 191 and the second negative access resistor 192. This connection allows the second protection integrated unit 160 to monitor and control the current in the negative path.

[0095] The second current sensing pin 163 is connected between the second negative 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 multi-pole ear battery cell by sensing the voltage drop across the resistor, thereby achieving precise control of the current. This is crucial for preventing overcurrent situations that can cause irreversible damage to the multi-pole ear battery cell.

[0096] The second over-discharge detection pin 164 is connected to the second charge control terminal 181. This configuration allows the second protection integrated unit 160 to control the third switch module to cut off the circuit when the voltage of the multi-tab battery is lower than the preset safety threshold, thereby preventing over-discharge of the multi-tab battery.

[0097] 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, thereby protecting the multi-tab battery from over-current damage.

[0098] The second switch control pin 166 is arranged between the first discharge switch module 180 and the negative output connector 140. This design provides direct monitoring of the state of the first discharge switch module 180, ensuring that the first discharge switch module 180 can correctly respond to the control signal of the second protection integrated unit 160. This monitoring mechanism helps maintain the stability and reliability of the entire circuit.

[0099] Based on the above embodiments, the battery protection circuit of the present application can more effectively cope with the complexity of multi-tab batteries, providing comprehensive and precise protection measures to ensure the safe operation of multi-tab batteries under various working conditions.

[0100] Reference Figure 2 According to some embodiments of the present application, the first charge switch module 170 includes two field effect transistors connected in series through the source and drain. In the first charge switch module 170, the first charge control terminal 171 refers to the gate of the field effect transistor close to the second negative access resistor 192 side, and the first discharge control terminal 172 refers to the gate of the field effect transistor close to the first discharge switch module 180 side.

[0101] In some embodiments of the present application, the design of the first charge switch module 170 adopts a two-field effect transistor series connection mode. This configuration allows the negative protection branch to achieve more precise control. Field effect transistors are voltage-controlled devices whose working principle is to control the current flow between the source and drain by applying a voltage to the gate. In the first charge switch module 170, the source and drain of the two field effect transistors are connected in series, forming an electronic switch, i.e., the first charge switch module 170.

[0102] The first charging control terminal 171 refers to the gate of the field-effect transistor on the side of the first charging switch module 170 closer to the second negative electrode access resistor 192. This means that by applying an appropriate voltage to this gate, the on-off state of the field-effect transistor can be controlled, thereby affecting the switching state of the entire first charging switch module 170. When this field-effect transistor is on, current can flow through the first charging switch module 170, continuing to flow along the negative electrode protection branch to the negative electrode output connector 140. Conversely, when this field-effect transistor is off, the current flow is blocked, thereby cutting off the negative electrode protection branch.

[0103] The first discharging control terminal 172 refers to the gate of the field-effect transistor on the side of the first charging switch module 170 closer to the first discharging switch module 180. The function of this first discharging 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 discharging control terminal 172, the on-off state 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.

[0104] The embodiments of the present application allow the battery protection circuit to have more precise control over the negative electrode of the multi-tab battery, as it provides two independent field-effect transistors to act as switching controls, which can be operated separately or simultaneously under different conditions. For example, in the case of detecting over-discharge or over-current, the battery protection circuit can cut off the current by controlling the gate voltage of the two field-effect transistors, thereby protecting the multi-tab battery from damage. In this way, the first charging switch module 170 provides an efficient and reliable current control mechanism for the battery protection circuit.

[0105] According to some embodiments of the present application, the first discharging switch module 180 includes two field-effect transistors connected in series through the source and drain, and in the first discharging 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 discharging control terminal 182 refers to the gate of the field-effect transistor on the side closer to the negative electrode output connector 140.

[0106] In some embodiments of the present application, the first discharging switch module 180 can also be designed in a two-field-effect transistor series manner, which is similar to the first charging switch module 170, aiming to provide an additional control point for the negative electrode protection branch of the multi-tab battery. In the first discharging switch module 180, the source and drain of the two field-effect transistors are connected in series, forming another electronic switch, i.e., the first discharging switch module 180.

[0107] The second charge control terminal 181 refers to the gate of the field-effect transistor on the side of the first discharge switch module 180 closer to the first charge switch module 170. The function of this second charge control terminal 181 is to control the on-off state of the field-effect transistor by applying an appropriate voltage, thereby affecting the switching state of the entire first discharge switch module 180. When this field-effect transistor is on, current can flow through the first discharge switch module 180, continuing to flow along the negative protection branch to the negative output connector 140. Conversely, when this field-effect transistor is off, the current flow is blocked, thereby cutting off part of the negative protection branch.

[0108] The second discharge control terminal 182 refers to the gate of the field-effect transistor on the side of the first discharge switch module 180 closer to 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 at the second discharge control terminal 182, the on-off state of the second field-effect transistor can be controlled, further controlling whether current can pass through the first discharge switch module 180.

[0109] The embodiments of the present application allow the battery protection circuit to have more precise control over the negative protection branch of the multi-tab battery, as it provides two independent field-effect transistors to act as switching controls, which can be operated separately or simultaneously under different conditions. For example, in the case of detecting over-discharge or over-current, the protection circuit can cut off the current by controlling the gate voltage of the two field-effect transistors, thereby protecting the battery from damage. In addition, this design also increases the flexibility of the circuit, as the two switching control terminals can be operated independently to adapt to different protection needs and strategies. In this way, the first discharge switch module 180 provides an efficient and reliable current control mechanism for the battery protection circuit.

[0110] It should be understood that the first discharge switch module 180, together with the first charge switch module 170, forms a double protection system that can provide protection under different fault conditions, ensuring the safety and stability of the multi-tab battery under various working conditions. This design not only improves the safety of the battery, but also helps to extend the service life of the battery, reducing the downtime and maintenance costs of equipment caused by battery failure.

[0111] Referring to Figure 3 According to some embodiments of the present application, the first power supply positive pin 151 is connected to the battery tab input interface 110 through the first positive access resistor 193, and the second power supply positive pin 161 is connected to the battery tab input interface 110 through the second positive access resistor 194.

[0112] In some embodiments of the present application, the first power supply positive pole pin 151 and the second power supply positive pole pin 161 of the battery protection circuit are connected to the battery positive lug input interface 110 through the first positive pole access resistor 193 and the second positive pole access resistor 194 respectively. It should be noted that by introducing the positive pole access resistor between the corresponding power supply positive pole pin and the battery positive lug input interface 110, the sudden change of current can be limited, and the voltage spike in the circuit can be reduced. This current limiting effect helps to protect the multi-pole lug battery and the circuit from transient current, especially when the circuit is started or the load is suddenly changed. Secondly, the positive pole access resistor can also serve as a point for current detection. By monitoring the voltage drop across the positive pole access resistor, the battery protection circuit of the embodiments of the present application can calculate the current flowing through the multi-pole lug battery, thereby achieving overcurrent protection. This real-time current monitoring is crucial for preventing the battery from being damaged by overcurrent. In addition, this design also helps to evenly distribute the current, especially in multi-pole lug batteries, multiple positive poles can provide lower internal resistance and higher power density. By using independent positive pole access resistors on each power supply positive pole pin, it can ensure that the current is evenly distributed among the multiple positive poles of the multi-pole lug battery, thereby improving the efficiency and performance of the battery.

[0113] As can be seen, by introducing the positive pole access resistor between the power supply positive pole pin and the battery positive lug input interface 110, the embodiments of the present application not only improve the safety and stability of the battery protection circuit, but also help to optimize the performance and life of the multi-pole lug battery.

[0114] Reference Figure 4 According to some embodiments of the present application, the first negative pole access resistor 191 is configured in parallel with the first filter capacitor 195 across the two ends, and the second negative pole access resistor 192 is configured in parallel with the second filter capacitor 196 across the two ends.

[0115] In some embodiments of the present application, the first negative pole access resistor 191 of the battery protection circuit is configured with the first filter capacitor 195 across the two ends, and the second negative pole access resistor 192 is configured with the second filter capacitor 196 across the two ends. The purpose of this configuration is to achieve better current stability and noise suppression in the negative protection branch of the multi-pole lug battery.

[0116] It should be noted that the first filter capacitor 195 and the second filter capacitor 196 play a role in smoothing voltage fluctuations and filtering high-frequency noise. When current flows through the first negative pole access resistor 191 or the second negative pole access resistor 192, some high-frequency noise may be generated. If these noises are not suppressed, they may affect the normal operation of the circuit, and even may trigger false action of the battery protection circuit. By connecting filter capacitors in parallel across the first negative pole access resistor 191 and the second negative pole access resistor 192, these noises can be effectively reduced, providing a more stable current environment, thereby protecting the battery from the influence of transient current fluctuations.

[0117] Referring to Figure 5 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.

[0118] In addition, according to some embodiments of the present application, the negative tab input interface 120 of the battery cell includes at least two negative contacts (e.g., a first negative contact 121 and a second negative contact 122) for connecting at least two negative tabs of a multi-tab battery cell.

[0119] It should be noted that the design of the multi-tab battery cell aims to reduce the internal resistance of the battery cell by increasing the number of tabs, thereby improving the current carrying capacity, which is particularly important for high-performance battery applications. However, with the increase in the number of tabs, the protection and monitoring of the battery cell also become more complex.

[0120] It should be noted that the positive tab input interface 110 of the battery cell can include two or more positive contacts, which allows direct connection of at least two positive tabs of a multi-tab battery cell. The multi-tab battery cell, due to its unique design, can provide lower internal resistance and higher power density. By providing multiple positive contacts, the battery protection circuit can better adapt to the structure of the multi-tab battery cell, achieving comprehensive protection of the multi-tab battery cell. This design not only ensures that the current can be evenly distributed among the multiple positive tabs of the battery cell, but also helps to improve the efficiency and performance of the battery. At the same time, the design of multiple positive contacts provides more flexibility for the battery protection circuit, enabling it to adapt to different configurations of multi-tab battery cells, enhancing the versatility and applicability of the circuit.

[0121] It should be noted that the design of the negative tab input interface 120 of the battery cell also takes into account the characteristics of the multi-tab battery cell, including at least two negative contacts for connecting at least two negative tabs of a multi-tab battery cell. This design allows the battery protection circuit to establish a connection with multiple negative tabs of the multi-tab battery cell, thereby achieving comprehensive protection and monitoring of the multi-tab battery cell. The advantage of this design is that it allows the current to be evenly distributed among the multiple negative tabs of the battery cell, reducing the current burden on individual negative tabs and thereby reducing the risk of overheating and overloading. In addition, the design of multiple negative contacts helps to improve the charging and discharging efficiency of the multi-tab battery cell, as the current can flow in and out of the battery cell more evenly.

[0122] It can be seen that the battery protection circuit of the present application, by providing multiple positive contacts in the positive tab input interface, or by including at least two negative contacts in the negative tab input interface 120, not only improves the safety and reliability of the battery protection circuit, but also helps to optimize the performance and service life of the multi-tab battery cell.

[0123] According to the multi-tab battery cell of the embodiment of the application, the multi-tab battery cell comprises:

[0124] a main body comprising a positive tab and a negative tab, the main body being composed of the positive tab and the negative tab;

[0125] at least one positive tab, the positive tab being electrically connected to the positive tab;

[0126] at least one negative tab, the negative tab being electrically connected to the negative tab;

[0127] the battery cell protection circuit of the embodiment of the application; wherein the positive tab input interface of the battery cell protection circuit is connected to the positive tab, and the negative tab input interface of the battery cell protection circuit is connected to the negative tab.

[0128] It should be noted that the multi-tab battery cell comprises: a main body, at least one positive tab, at least one negative tab, and the battery cell protection circuit of the embodiment of the application. The main body can comprise a positive tab and a negative tab, and the main body is composed of the positive tab and the negative tab. Specifically, the positive tab is usually made of active material with high energy density coated on a conductive current collector, such as lithium cobaltate, nickel-cobalt-manganese ternary material, or lithium iron phosphate, and the conductive current collector can be aluminum foil, etc. The negative tab usually uses graphite or silicon-carbon composite material as active material, which is coated on a copper foil current collector.

[0129] Referring to Figure 6 to Figure 7 In some more specific embodiments, the multi-tab battery cell 200 comprises: a main body 210, a first positive tab 221, a second positive tab 222, and a negative tab 230. The main body 210 comprises a positive tab 240 and a negative tab 250, and the main body 210 is formed by layering and winding the positive tab 240 and the negative tab 250. Specifically, the positive tab 240 is usually made of active material with high energy density coated on a conductive current collector, such as lithium cobaltate, nickel-cobalt-manganese ternary material, or lithium iron phosphate, and the conductive current collector can be aluminum foil, etc. The negative tab 250 usually uses graphite or silicon-carbon composite material as active material, which is coated on a copper foil current collector.

[0130] The positive sheet 240 and the negative sheet 250 are stacked in the thickness direction of the positive sheet 240, and then the same end of the positive sheet 240 and the negative sheet 250 is wound to form the main body 210. The tab includes a positive tab and a negative tab 230. During charging, an external power source inputs electric energy to the inside of the multi-tab battery cell 200 through the positive tab, so that lithium ions are released from the positive electrode material and migrate to the negative electrode through the electrolyte. During discharging, lithium ions are released from the negative electrode material, return to the positive electrode through the electrolyte, and release electric energy. This process also requires the electric energy to be transmitted to the external circuit through the positive tab. In the 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 sheet 240, and the second positive tab 222 is electrically connected to the positive sheet 240. The number of the first positive tab 221 and the second positive tab 222 is not specifically limited. For example, the number of the first positive tab 221 can be one, two or more, and the number of the second positive tab 222 can be one, two or more. The first positive tab 221 can be electrically connected to the positive sheet 240 by being welded to the positive sheet 240. The second positive tab 222 can be electrically connected to the positive sheet 240 by being welded to the positive sheet 240. The negative tab 230 can be electrically connected to the negative sheet 250, and the number of the negative tab 230 can be one. The negative tab 230 can be electrically connected to the negative sheet 250 by being welded to the negative sheet 250. The first positive tab 221 and the negative tab 230 are located on both sides of the second positive tab 222 in the width direction. Specifically, during charging of the multi-tab battery cell 200, external current enters the multi-tab battery cell 200 from the positive electrode. Specifically, after the multi-tab battery cell 200 is provided with the first positive tab 221 and the second positive tab 222, external current can enter the multi-tab battery cell 200 from 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 speed of current entering the multi-tab battery cell 200 is slow. In the present application, current can enter the multi-tab battery cell 200 from the first positive tab 221 and the second positive tab 222, so this can make the charging speed of the multi-tab battery cell 200 faster. Specifically, the multi-tab battery cell 200 can be quickly charged.

[0131] It is to be continued that after the first positive tab 221 and the second positive tab 222 are arranged, the first positive tab 221 and the second positive tab 222 can also play a role of common shunt during the charging process of the multi-tab battery cell 200, so as to avoid the temperature of the multi-tab battery cell 200 being too high. In addition, the arrangement 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. It is to be continued that 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, and compared with the arrangement that 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 more likely to effectively avoid the risk of short circuit of the multi-tab battery cell 200.

[0132] Further, please refer to Figure 1 to Figure 3 In some embodiments, the first positive tab 221 and the second positive tab 222 are respectively located on different winding layers of the main body 210. Specifically, it is mentioned above that the main body 210 includes the positive sheet 240 and the negative sheet 250, and after the positive sheet 240 and the negative sheet 250 are stacked, the main body 210 is formed by winding. Therefore, the positive sheet 240 on the main body 210 has multiple layers of winding, the first positive tab 221 can be located on the outermost layer of the positive sheet 240, or the first positive tab 221 can be located on the middle layer of the positive sheet 240, or the first positive tab 221 can be located on the innermost layer of the positive sheet 240. The second positive tab 222 can be located on the outermost layer of the positive sheet 240, or the second positive tab 222 can be located on the middle layer of the positive sheet 240, or the second positive tab 222 can be located on the innermost layer of the positive sheet 240. Wherein, after the first positive tab 221 and the second positive tab 222 are respectively located on different winding 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 respectively diffuse the current to different layers of the positive sheet 240, which can improve the charging speed compared with the arrangement that the first positive tab 221 and the second positive tab 222 are located on the same winding layer of the main body 210, and the first positive tab 221 and the second positive tab 222 respectively located on different winding layers of the main body 210 can improve the charging speed.

[0133] Further, in some embodiments, the negative tab 230 is connected to the middle position of the negative sheet 250. That is, both sides of the negative sheet 250 have a negative active material layer, and a recess is arranged at the middle position of the negative active material layer, and the negative tab 230 is arranged in the recess. Specifically, after the negative tab 230 is arranged at the middle position of the negative sheet 250, when the negative sheet 250 is charged, the current can be diffused from the middle position of the negative sheet 250 to each position of the negative sheet 250, which greatly improves the charging speed of the negative sheet 250.

[0134] In some embodiments, the multi-tab battery cell 200 can further include two positive tab adhesives 2211, respectively attached to the first positive tab 221 and the second positive tab 222. The main function of the positive tab adhesive 2211 is to insulate and prevent the tab from directly contacting other parts of the battery (such as the aluminum plastic film) to cause a short circuit. During the battery packaging process, the positive tab adhesive 2211 is sealed and bonded together with the aluminum plastic film by heating, forming an effective insulation barrier to ensure the safe operation of the battery. In this way, the two positive tab adhesives 2211 respectively attached to the first positive tab 221 and the second positive tab 222 can improve the safety of the battery. The multi-tab battery cell 200 further includes a negative tab adhesive 2301 attached to the negative tab 230.

[0135] In some embodiments of the present application, the first positive tab is electrically connected to the positive plate, specifically welded to the positive plate. The negative tab is electrically connected to the negative plate, specifically welded to the negative plate.

[0136] The contents of the above-mentioned battery cell protection circuit embodiments are applicable to the embodiments of the present multi-tab battery cell. The functions realized by the embodiments of the present multi-tab battery cell are the same as those of the above-mentioned battery cell protection circuit embodiments, and the beneficial effects achieved by the embodiments of the present multi-tab battery cell are also the same as those of the above-mentioned battery cell protection circuit embodiments.

[0137] The battery according to the embodiments of the present application comprises:

[0138] The shell has a storage cavity.

[0139] The multi-tab battery cell according to the embodiments of the present application is arranged in the storage cavity. The positive tab and the negative tab of the multi-tab battery cell are arranged to extend outward from the storage cavity.

[0140] The contents of the above-mentioned battery cell protection circuit embodiments are applicable to the embodiments of the present battery. The functions realized by the embodiments of the present battery are the same as those of the above-mentioned battery cell protection circuit embodiments, and the beneficial effects achieved by the embodiments of the present battery are also the same as those of the above-mentioned battery cell protection circuit embodiments.

[0141] The electronic device according to the embodiments of the present application comprises the battery according to the embodiments of the present application.

[0142] The contents of the above-mentioned battery cell protection circuit embodiments are applicable to the embodiments of the present electronic device. The functions realized by the embodiments of the present electronic device are the same as those of the above-mentioned battery cell protection circuit embodiments, and the beneficial effects achieved by the embodiments of the present electronic device are also the same as those of the above-mentioned battery cell protection circuit embodiments.

[0143] The principles and implementations of the present application are described herein with specific examples, and the above examples are only used to help understand the core ideas of the present application. The above is only the preferred embodiment of the present application, and it should be pointed out that due to the limited nature of the expression, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, without departing from the principles of the present application, a number of improvements, refinements or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or without improvement, directly apply the concept and technical solution of the utility model to other occasions, should be regarded as the protection scope of the present application.

Claims

1. A cell protection circuit, characterized by, The application is applied to the protection of multi-pole ear battery, comprising: A positive pole ear input interface for connecting the positive pole ear of the multi-pole ear battery; A negative pole ear input interface for connecting the negative pole ear of the multi-pole ear battery; A positive output connector connected to the positive pole ear input interface; A negative output connector connected to the negative pole ear input interface through a negative pole protection branch; The negative pole protection branch has a first negative pole access resistor, a second negative pole access resistor, a first charging switch module and a first discharging switch module connected in series between the negative output connector and the negative pole ear input interface. The first charging switch module is provided with a first charging control end and a first discharging control end. The first discharging switch module is provided with a second charging control end and a second discharging control end. A first protection integrated unit is provided with a first power supply positive pole pin, a first power supply negative pole pin, a first current sensing pin, a first over-discharge detection pin, a first voltage detection pin and a first switch control pin. The first power supply positive pole pin is connected to the positive pole ear input interface, the first power supply negative pole pin is connected to the negative pole ear input interface, the first current sensing pin is connected between the first negative pole access resistor and the second negative pole access resistor, the first over-discharge detection pin is connected to the first charging control end, the first voltage detection pin is connected to the first discharging control end, and the first switch control pin is arranged between the first charging switch module and the first discharging switch module. A second protection integrated unit is provided with a second power supply positive pole pin, a second power supply negative pole 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 supply positive pole pin is connected to the positive pole ear input interface, the second power supply negative pole pin is connected between the first negative pole access resistor and the second negative pole access resistor, the second current sensing pin is connected between the second negative pole access resistor and the first charging switch module, the second over-discharge detection pin is connected to the second charging control end, the second voltage detection pin is connected to the second discharging control end, and the second switch control pin is arranged between the first discharging switch module and the negative output connector.

2. The cell protection circuit according to claim 1, characterized by, The first charging switch module includes two field effect transistors connected in series through a source and a drain. In the first charging switch module, the first charging control end refers to the gate of the field effect transistor close to the second negative pole access resistor, and the first discharging control end refers to the gate of the field effect transistor close to the first discharging switch module.

3. The cell protection circuit according to claim 1 or 2, characterized by, The first discharging switch module includes two field effect transistors connected in series through a source and a drain. In the first discharging switch module, the second charging control end refers to the gate of the field effect transistor close to the first charging switch module, and the second discharging control end refers to the gate of the field effect transistor close to the negative output connector.

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

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

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

7. The cell protection circuit according to claim 1 or 6, characterized by, The negative pole lug input interface of the battery cell includes at least two negative pole contacts for connecting at least two negative pole lugs of the multi-pole lug battery cell.

8. A multi-tab cell characterized by, The battery cell protection circuit according to any one of claims 1 to 7; wherein the positive pole lug input interface of the battery cell protection circuit is connected to the positive pole lug, and the negative pole lug input interface of the battery cell protection circuit is connected to the negative pole lug. The battery cell protection circuit according to any one of claims 1 to 7; wherein the positive pole lug input interface of the battery cell protection circuit is connected to the positive pole lug, and the negative pole lug input interface of the battery cell protection circuit is connected to the negative pole lug. The battery cell protection circuit according to any one of claims 1 to 7; wherein the positive pole lug input interface of the battery cell protection circuit is connected to the positive pole lug, and the negative pole lug input interface of the battery cell protection circuit is connected to the negative pole lug. The battery cell protection circuit according to any one of claims 1 to 7; wherein the positive pole lug input interface of the battery cell protection circuit is connected to the positive pole lug, and the negative pole lug input interface of the battery cell protection circuit is connected to the negative pole lug. The battery cell protection circuit according to any one of claims 1 to 7; wherein the positive pole lug input interface of the battery cell protection circuit is connected to the positive pole lug, and the negative pole lug input interface of the battery cell protection circuit is connected to the negative pole lug.

9. A battery characterized by The battery cell protection circuit according to any one of claims 1 to 7; wherein the positive pole lug input interface of the battery cell protection circuit is connected to the positive pole lug, and the negative pole lug input interface of the battery cell protection circuit is connected to the negative pole lug. ​ ​ 10. An electronic device, characterized by ​

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