A battery swelling protection system and a battery product
By setting conductive components and conductive layers on the battery surface and utilizing the short-circuit detection electrical characteristics of the conductive components, the problem of complexity and high cost of existing battery swelling detection circuits is solved, realizing simple and low-cost battery swelling protection, which is suitable for miniaturized terminal devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI COSMX POWER CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-21
AI Technical Summary
Existing battery swelling detection solutions mostly use pressure-sensitive and light-sensitive methods, resulting in complex circuits and high costs.
The design employs conductive components and conductive layers. The conductive components are positioned at different locations on the battery surface without contacting each other. The conductive layers are spaced apart. When the battery expands, the conductive components come into contact with the conductive layers and short-circuit. The detection module detects the electrical characteristics to determine the expansion, and the control module controls the battery's operating state.
It achieves simple and low-cost battery swelling detection and protection, making it suitable for integration into miniaturized terminal devices and improving safety.
Smart Images
Figure CN224537110U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery protection technology, and in particular to a battery swelling protection system and battery product. Background Technology
[0002] Battery products may experience abnormal swelling during use, and continuing to use an swollen battery poses a significant safety risk. Therefore, modern battery products are typically equipped with swelling detection mechanisms to prevent the continued use of abnormally swollen batteries.
[0003] Currently, most common battery swelling detection solutions on the market use pressure-sensitive or light-sensitive methods, which involve complex circuits and high costs.
[0004] Therefore, those skilled in the art urgently need a battery swelling protection system to solve the problems of complex circuits and high costs when detecting and protecting battery swelling through methods such as pressure sensitivity and light sensing. Utility Model Content
[0005] The purpose of this application is to provide a battery swelling protection system and battery product, which provides a battery swelling detection and protection solution with a simpler circuit and lower cost compared to pressure-sensitive, light-sensitive and other implementation methods.
[0006] To address the aforementioned technical problems, this application provides a battery swelling protection system, comprising: a conductive component, a conductive layer, a detection module, and a control module;
[0007] The conductive component is at least two; each conductive component is disposed at a different position on the same surface of the battery, and no two conductive components are in contact with each other.
[0008] The conductive layer is spaced apart from the conductive component;
[0009] The detection module is connected to each of the conductive components and is used to detect whether the conductive components are short-circuited through the conductive layer.
[0010] The control module is connected to the detection module and is used to control the working state of the battery based on the detection results of the detection module.
[0011] In one alternative embodiment, the number of conductive components is three or more;
[0012] The detection module is also used to: determine the location of the conductive component that is shorted by the conductive layer.
[0013] In one alternative embodiment, the conductive component includes a central component and a plurality of positioning components;
[0014] The central component is located at the middle part of the battery surface, and each of the positioning components is arranged around the central component.
[0015] In one alternative embodiment, the detection module includes a resistor network;
[0016] When the conductive components are short-circuited, the resistance of the resistor network changes; and when two different conductive components are short-circuited, the resistance of the resistor network changes differently.
[0017] In one alternative embodiment, the resistor network includes a plurality of resistors connected in series;
[0018] Each of the conductive components is connected to a different circuit node in the resistor network.
[0019] In one alternative embodiment, the resistor network includes a plurality of resistors connected in parallel, wherein each resistor has a different resistance value;
[0020] Each resistor branch has two electrical connection nodes, a first node and a second node, forming a default disconnected electrical isolation structure; and the first node in each resistor branch is connected to the central component, while the second node in each resistor branch is connected to different positioning components.
[0021] In one optional embodiment, the control module includes: a battery protection chip for the battery, and a switching transistor disposed in the charging and discharging circuit of the battery;
[0022] The detection module includes: a host computer;
[0023] The host computer is connected to the resistor network and is used to: determine the positions of the short-circuited conductive components according to the resistance value of the resistor network, and send a cut-off command to the battery protection chip when a conductive component is short-circuited.
[0024] The battery protection chip is used to control the switching transistor to cut off the charging and discharging circuit of the battery when the cut-off command is received.
[0025] In one alternative embodiment, the conductive component is an exposed pad on a flexible circuit board disposed on the surface of the battery;
[0026] The battery protection chip and the resistor network are disposed on the battery protection board;
[0027] The flexible circuit board is connected to the battery protection board via gold fingers.
[0028] In one optional embodiment, the conductive layer is: the metal back shell of the battery compartment, or a conductive film disposed on the side of the non-metallic back shell of the battery compartment near the conductive component.
[0029] To address the aforementioned technical problems, this application also provides a battery product, including the aforementioned battery swelling protection system.
[0030] This application provides a battery swelling protection system, including conductive components disposed on the battery surface and a conductive layer disposed at a certain distance from the conductive components. When the battery does not experience abnormal swelling, the conductive components will not contact the conductive layer, and the conductive components will not short-circuit with each other. However, when the battery experiences abnormal swelling, the conductive components on the battery surface will be pushed towards the conductive layer until they contact it. When multiple conductive components contact the conductive layer, they will short-circuit with each other, resulting in electrical characteristics caused by the short circuit. The detection module can then determine whether there is a short circuit in the conductive components by detecting the presence of corresponding electrical characteristics, thus determining whether the battery is abnormally swollen. The control module then controls the battery's operating state to prevent the battery with abnormal swelling from continuing to operate, thus avoiding safety risks. The battery abnormal swelling detection and protection implemented by this system does not require the use of pressure-sensitive or light-sensitive sensors. The circuit structure for detecting short circuits in the conductive components and the detection circuit is simple, lower in cost, and smaller in size, making it more suitable for integration into battery products to ensure battery safety.
[0031] The battery product provided in this application corresponds to the aforementioned battery swelling protection system and has the same effect. Attached Figure Description
[0032] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 This application provides a structural diagram of a battery swelling protection system.
[0034] Figure 2 A structural diagram of a conductive component arrangement scheme provided in this application;
[0035] Figure 3 A circuit diagram of a series resistor network and conductive component provided in this application;
[0036] Figure 4 A circuit schematic diagram of a control module provided in this application;
[0037] Figure 5 A structural diagram of a battery product provided in this application;
[0038] Figure 6 This application provides a structural diagram of a metal back shell for a battery compartment;
[0039] Among them, 11 is a conductive component, 111 is a central component, 112 is a positioning component, 12 is a conductive layer, 13 is an FPC, 14 is a gold finger, 20 is a battery compartment, 21 is a battery, and 22 is a back cover. Detailed Implementation
[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.
[0041] The core of this application is to provide a battery swelling protection system and a battery product.
[0042] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0043] During cyclic use, batteries can experience issues such as electrode expansion, electrolyte oxidation and decomposition leading to gas production, or manufacturing defects like poor battery packaging introducing moisture or corner damage that can cause expansion. Continuing to charge and discharge batteries with abnormal swelling within end products poses significant safety risks and potential hazards to users. This is especially true for products like Virtual Reality (VR) devices, which are worn directly on the head and eyes; spontaneous combustion or explosion of the battery could lead to serious safety problems.
[0044] Therefore, it is currently necessary to detect battery swelling in order to take appropriate measures when swelling occurs. Most battery swelling detection methods on the market currently use pressure sensing, light sensing, etc., which involve complex circuitry and are costly.
[0045] To address the aforementioned problems, this application provides a battery swelling protection system, such as... Figure 1 As shown, it includes: a conductive component 11, a conductive layer 12, a detection module, and a control module.
[0046] There are at least two conductive components 11; each conductive component 11 is disposed at a different position on the same surface of the battery 21, and no two conductive components 11 are in contact with each other.
[0047] The distance between the conductive layer 12 and the conductive component 11 (i.e. Figure 1The interval distance (D) is set in the middle.
[0048] The detection module is connected to each conductive component 11 and is used to detect whether there is a short circuit between conductive components 11 through the conductive layer 12.
[0049] The control module is connected to the detection module and is used to control the working state of battery 21 based on the detection results of the detection module.
[0050] It should be noted that this embodiment does not limit the specific type of the conductive component 11, which can be a structural component made of a conductive medium, such as an exposed solder pad, conductive contact, or probe. Similarly, this embodiment does not limit the conductive layer 12, which can be implemented by conductive structural components such as a metal film or copper plate. The conductive layer 12 and the conductive component 11 are separated by a certain distance. This embodiment does not limit the specific value of this distance, but it should meet the following conditions: when the battery 21 does not exhibit abnormal expansion, that is, when the battery does not expand, or when it exhibits normal expansion due to battery cycling (normal expansion is generally very small and very slight compared to abnormal expansion; reflected in the direction of the battery 21 along the conductive component 11, that is, the deformation caused by normal expansion due to battery cycling is significantly smaller than the deformation caused by abnormal expansion), the conductive component 11 will not touch the conductive layer 12; however, when the battery 21 exhibits abnormal expansion, the conductive component 11 will touch the conductive layer 12. Furthermore, the conductive layer 12 and the conductive component 11 are spaced apart, which means that there should be no other structure or device between the conductive layer 12 and the conductive component 11 that would obstruct the contact between the conductive component 11 and the conductive layer 12. This ensures that when the battery 21 is not expanded, the conductive component 11 will not be electrically connected to the conductive layer 12 due to other conductive structures, and when the battery 21 is expanded, the conductive component 11 will not be unable to be electrically connected to the conductive layer 12 due to other insulating structures.
[0051] Based on this, since the system sets multiple non-contacting conductive components 11 at different positions on the same surface of the battery 21, when the battery 21 is not swollen, the conductive components 11 will not contact the conductive layer 12, and therefore will not short-circuit with each other. However, when the battery 21 swells, the conductive components 11 located at the swollen areas of the battery 21 will be squeezed and pushed towards the conductive layer 12 by the swollen surface of the battery 21 until they make contact. When multiple conductive components 11 touch the conductive layer 12, these conductive components 11 that have touched the conductive layer 12 will short-circuit, thus exhibiting the electrical characteristics of a short circuit (such as the resistance between two conductive components 11 in parallel being short-circuited, and the voltage and current of one conductive component 11 being detectable from another conductive component 11). The detection module can determine whether any conductive component 11 is short-circuited by detecting this electrical characteristic, that is, it can determine whether the battery 21 has swollen. When the battery 21 swells, the control module controls the battery 21 to stop working, avoiding the safety hazards caused by the continued use of the swollen battery 21.
[0052] Subsequently, this embodiment also does not impose any limitations on the detection module and the control module. As mentioned above, the detection module's function is to detect whether there is a short circuit between the conductive components 11. Therefore, the detection module should be configured accordingly based on the expected short circuit electrical characteristics it is detecting. For example, the detection module may specifically detect parameters such as resistance, current, or voltage to determine whether there is a short circuit between the conductive components 11. Similarly, as described above, the control module's function is to stop the battery 21 from continuing to operate when the battery 21 expands. This function can be implemented through the battery 21's original power management module or power protection module, or through additional control devices; this embodiment does not impose any limitations on this. For example, a microcontroller can control the switching transistor set in the battery 21's charging and discharging circuit to control the disconnection of the battery 21's charging and discharging circuit, preventing the expanded battery 21 from continuing to charge and discharge.
[0053] As described above, the battery swelling protection system provided in this application can detect battery swelling. Furthermore, the entire circuit eliminates the need for pressure sensors, light sensors, or detection circuits, resulting in a simpler circuit structure, lower cost, and more controllable circuit size. This facilitates its application in integrated battery products and is suitable for various miniaturized terminal devices, better ensuring the personal and property safety of users.
[0054] On the other hand, regarding the number of conductive components 11, since this system determines whether the battery 21 has expanded by short-circuiting the conductive components 11 with the conductive layer 12, the number of conductive components 11 must be at least two, but the specific number is not limited. It should be noted that when the number of conductive components 11 is three or more, different short-circuit combinations may exist when the conductive components 11 are short-circuited. For example, if there are conductive components 11A, B, and C, the short-circuit combinations include three sets: A and B, A and C, and B and C. Furthermore, since the conductive components 11 are positioned differently on the surface of the battery 21, different short-circuit combinations indicate different locations where the battery 21 has expanded (the expansion location is generally between the two short-circuited conductive components 11). That is, when there are three or more conductive components 11, this system can detect not only whether the battery 21 has expanded, but also the location of the expansion.
[0055] That is, this embodiment also provides an optional implementation scheme:
[0056] The number of conductive components 11 is three or more; the detection module is also used to: determine the position of the conductive components 11 shorted by the conductive layer 12.
[0057] This embodiment uses three or more conductive components 11 to achieve a short-circuit combination of multiple conductive components 11. When two conductive components 11 are short-circuited due to the expansion of the battery 21, the detection module can detect which two conductive components 11 are short-circuited and thus pinpoint the location of the battery 21 expansion, providing data support for subsequent maintenance personnel to locate the expansion position.
[0058] Furthermore, based on the above embodiments, this embodiment also provides a scheme for configuring the conductive component 11, such as... Figure 2 As shown:
[0059] The conductive component 11 includes a central component 111 and a plurality of positioning components 112; wherein the central component 111 is disposed in the middle part of the surface of the battery 21, and each positioning component 112 is arranged around the central component 111.
[0060] exist Figure 2 In one optional example shown, there are a total of 7 conductive components 11, all of which are exposed pads. There is one central component 111 (pad 7) and six positioning components 112 (pads 1-6), with pads 1-6 arranged around pad 7. When the battery 21 expands, there may be 6 short-circuit combinations: pad 1-pad 7, pad 2-pad 7, pad 3-pad 7...pad 6-pad 7, corresponding to the expansion positions of the battery 21 as upper, lower, upper left, lower left, upper right, and lower right, respectively. Therefore, the accuracy and range of locating the expansion position of the battery 21 in this embodiment are related to the number and arrangement of the conductive components 11. The appropriate number and arrangement of the conductive components 11 should be selected according to the actual shape of the battery 21 surface and the required positioning accuracy; this embodiment does not impose any limitations on this.
[0061] The conductive component 11 provided in this embodiment is divided into a central component 111 located at the center point of the battery 21 and a positioning component 112 surrounding the central component 111. Based on this positional relationship, no matter where the battery 21 expands, it can be detected by at least one set of short-circuited conductive components 11, thereby achieving effective expansion position detection.
[0062] On the other hand, as described above, the detection module detects the expansion of the battery 21 by detecting the electrical characteristics caused by the short circuit of the conductive component 11. When there are multiple short circuit combinations, the detection module needs to be able to distinguish the electrical characteristics of different short circuit combinations to locate the shorted conductive component 11. Based on this, this embodiment provides a further implementation of a detection module that distinguishes different short circuit combinations, using resistance values to reflect the electrical characteristics of the short circuit of the conductive component 11. The aforementioned detection module includes a resistor network.
[0063] When conductive component 11 is short-circuited, the resistance of the resistor network changes. Furthermore, the resistance changes differently when two different conductive components 11 are short-circuited.
[0064] Specifically, the two conductive components 11 of each short-circuit combination can be connected in parallel across different resistors in the resistor network. When the two conductive components 11 of different short-circuit combinations are short-circuited, the different resistors in the resistor network are short-circuited, thereby causing a change in the resistance value of the resistor network. And when the changes in the equivalent resistance value of the entire resistor network caused by the short-circuiting of different resistors in the resistor network are different, the function of locating the two conductive components 11 of different short-circuit combinations can be achieved.
[0065] It should be noted that this embodiment does not limit the specific structure of the resistor network, as long as the above requirements are met. Two conductive components 11 in a short-circuit combination can be connected in parallel with different resistors or multiple resistors. As long as it is ensured that when different conductive components 11 are short-circuited, different resistors or resistor combinations are short-circuited in the resistor network, and the resulting changes in the resistance value of the resistor network are different, the requirements are met.
[0066] Therefore, this embodiment uses the resistance value as the parameter value for detecting the short-circuit characteristics of the conductive component 11. The detection module only needs to be a resistor network composed of a few resistors. The circuit structure is simple and does not require complex devices such as varistor or photosensitive device. It has lower cost and smaller circuit size and is easier to implement.
[0067] Furthermore, regarding the aforementioned resistor network, this embodiment provides an optional circuit structure, such as... Figure 3 As shown, the resistor network includes multiple resistors (R7~R12) connected in series.
[0068] Each conductive component 11 (PAD1~PAD7) is connected to a different circuit node in the resistor network.
[0069] exist Figure 3 In the above embodiment, PAD7 is the central component 111, and PAD1 to PAD6 are the positioning components 112. Figure 3It is easy to see that when two conductive components 11 with different short-circuit combinations are short-circuited, they will short-circuit different resistors in the resistor network. For example, when the central component PAD7 and the positioning component PAD6 are short-circuited, resistor R12 in the resistor network is short-circuited. If resistor R6 were not present, the equivalent resistance value of the resistor network would be the sum of the resistance values of resistors R7 to R11. Similarly, when the central component PAD7 and the positioning component PAD5 are short-circuited, resistors R11 and R12 in the resistor network are short-circuited. If resistor R6 were not present, the equivalent resistance value of the resistor network would be the sum of the resistance values of resistors R7 to R10. Therefore, it can be seen that when a conductive component 11 is short-circuited, it will cause a change in the resistance value of the resistor network, and the resistance change caused by short-circuiting different conductive combinations is different, which can meet the above requirements for detecting the expansion of the battery 21 and locating the expansion position.
[0070] It should be noted that when using the series resistor network provided in this embodiment to detect whether the conductive component 11 is short-circuited and to determine the location of the short-circuited conductive component 11, the resistance values of all resistors used can be the same (because the number of short-circuited resistors caused by the shorting of different conductive components 11 is different, and regardless of whether the resistance values of each resistor are the same, the equivalent resistance value of the resistor network will inevitably change differently), thereby further reducing the implementation difficulty of the detection module.
[0071] It should also be noted that the resistor network described in this embodiment consists of multiple resistors connected in series. Its purpose is solely to ensure the implementation of the battery 21 expansion detection and battery 21 expansion positioning functions, and does not mean that the power grid network is limited to including only the aforementioned multiple resistors connected in series. In practical applications, other devices can be added to the resistor network based on other requirements, and this embodiment does not impose any restrictions on this.
[0072] like Figure 3 As shown, Figure 3 The system also includes resistor R6, which is connected in series with resistors R7~R12. The function of R6 is that when the center component PAD7 and the positioning component PAD1 are short-circuited, resistors R7~R12 in the resistor network are all short-circuited. Without resistor R6, the equivalent resistance of the resistor network is 0, which is difficult to detect in practical applications (resistance values are generally obtained by detecting voltage values). Therefore... Figure 3 Furthermore, a resistor R6 is added to the resistor network. This resistor will not be short-circuited by any conductive component 11, thus ensuring the basic resistance value of the resistor network.
[0073] In addition, such as Figure 3 As shown, Figure 3 It also includes a transient voltage suppressor (TVS) diode, D2. The TVS diode D2 serves to protect the circuit, preventing damage to components in the resistor network and subsequent circuits from surge pulses.
[0074] On the other hand, in addition to the series resistor network provided in the above embodiments, this embodiment also provides a parallel resistor network. The resistor network includes multiple resistors connected in parallel, each with a different resistance value.
[0075] Each resistor branch has two electrical connection nodes, a first node and a second node, forming a default disconnected electrical isolation structure; and the first node in each resistor branch is connected to the central component 111, while the second node in each resistor branch is connected to different positioning components 112.
[0076] As can be seen from the above connection structure, the number of short-circuit combinations between the central component 111 and the positioning component 112 corresponds to the number of parallel resistor branches in the resistor network of this embodiment. Each resistor branch is controlled by a corresponding set of short-circuit combinations to control the on / off state of the branch. When the two conductive components 11 in the corresponding short-circuit combination are not short-circuited, the electrical connection nodes of the two conductive components 11 on the parallel branch are not short-circuited, maintaining the default disconnected electrical isolation structure. When the two conductive components 11 in the corresponding short-circuit combination are short-circuited, the electrical connection nodes of the two conductive components 11 on the parallel branch are short-circuited, the default disconnected electrical isolation structure is destroyed, the resistor branch is turned on, that is, the resistance on the resistor branch participates in the composition of the equivalent resistance value of the resistor network. Based on this, for the entire resistor network, if no set of conductive components 11 is short-circuited, all resistor branches in the resistor network are open circuits, and the entire resistor network presents a high-resistance state. When a set of conductive components 11 is short-circuited, the resistor branch corresponding to that short-circuit combination in the resistor network is conductive, and the equivalent resistance value of the resistor network is also the resistance value of that resistor branch. Thus, it is possible to determine whether the conductive components 11 are short-circuited, that is, to detect the expansion of the battery 21. In addition, since the resistance values of the parallel resistors are different, based on the final equivalent resistance value of the resistor network, it is possible to determine which resistor branch is conductive, that is, to determine which set of conductive components 11 is short-circuited, and to locate the position of battery expansion.
[0077] As described above, the parallel resistor network provided in this embodiment can also detect and locate battery swelling. The circuit structure is simple, easy to implement, and low in cost. However, compared to the series resistor network described above, this embodiment requires that the resistance values of the multiple resistors connected in parallel be different to distinguish the conducting resistor branches and locate the battery swelling position. In practical applications, a suitable implementation scheme can be selected according to actual needs. Furthermore, in addition to the series and parallel resistor networks provided in the above embodiments, a combined series and parallel resistor network can also be used; this embodiment does not impose any restrictions on this. Its implementation principle is the same as the resistor network described above. By short-circuiting different conductive components 11, different resistors or resistor combinations in the resistor network are short-circuited, causing different changes in the equivalent resistance value of the resistor network, thus satisfying the requirements for detecting and locating battery swelling.
[0078] On the other hand, the above embodiments do not limit the specific implementation of the control module and detection module. They can be implemented using additional devices or by reusing existing devices. Generally, implementing them with additional devices is the simplest and most direct method, but reusing existing devices can better simplify the circuit structure and reduce costs. Therefore, this embodiment provides an alternative implementation scheme for the control module and detection module:
[0079] like Figure 4 As shown, the control module includes: a battery protection chip (Integrated Circuit, IC) for the battery, and a switching transistor installed in the battery's charging and discharging circuit.
[0080] The detection module includes: host computer.
[0081] The host computer is connected to the resistor network and is used to: determine the location of short-circuited conductive components based on the resistance value of the resistor network, and send a cut-off command to the battery protection chip when a conductive component is short-circuited.
[0082] The battery protection chip is used to control the switching transistor to cut off the battery's charging and discharging circuit when a cut-off command is received.
[0083] Among them, the protection IC is a common protection device in the current battery 21, which is used to provide the battery 21 with overcharge, over-discharge, overcurrent, and short-circuit protection functions. When the battery 21 triggers the above protection, the protection IC will activate the field-effect transistor (such as a MOSFET) set in the charging and discharging circuit of the battery 21. Figure 4 The MOSFET Q1 and other switching transistors in the IC cut off the charging and discharging circuit of the battery 21, preventing the battery 21 from continuing to operate. Therefore, the protection IC effectively meets the functional requirements of the control module in the above embodiments.
[0084] However, it should be noted that the existing protection IC does not have the function of receiving the output signal of the detection module and determining whether the conductive component 11 is short-circuited, or locating the position of the short-circuited conductive component 11. Therefore, the structure of the existing protection IC needs to be improved. For example... Figure 4 The CNT pin added to the protection IC U1 allows the protection IC to control the MOSFET to cut off the charging and discharging circuit of battery 21 when a cutoff command is received on the CNT pin. Furthermore, the cutoff command can be a specific voltage level signal, such as a high voltage level. It should be noted that this function of responding to a specific voltage level signal is very easy to implement, significantly reducing changes to the protection IC structure and avoiding increased size that could limit its application scenarios.
[0085] However, this introduces new problems: the protection IC itself cannot determine whether to cut off the charging / discharging circuit based on the equivalent resistance value of the resistor network, nor can it locate the expansion position based on the equivalent resistance value. Therefore, this embodiment introduces a host computer, which can be a processing device within this system or the battery product to which this system is applied. For example, when this system is applied to the battery 21 of electronic devices such as mobile phones and tablets, the host computer in this embodiment can be any processor with data processing capabilities within the mobile phone, tablet, or other electronic device. Since these electronic products themselves have high data processing requirements, the data processing required for determining whether the battery 21 is swollen based on the equivalent resistance value of the resistor network and for locating the battery swelling position is easily implemented by the host computer. It requires no structural modifications and does not consume excessive computing resources. Compared to directly changing the hardware structure and software functions of the protection IC, or adding additional processing devices, this approach is more economical and easier to implement.
[0086] It should be noted that the protection IC in this embodiment only functions to control the battery 21 to stop working. The detection of whether the battery 21 is swollen and the location of the swollen area are implemented by the host computer in the detection module. When the host computer determines that the battery 21 is swollen, it sends a cut-off command to the protection IC. The protection IC then responds to this cut-off command and cuts off the charging and discharging circuit of the battery 21.
[0087] In addition, such as Figure 4 As shown, in some application scenarios, to further improve the safety of battery 21, redundant protection for battery 21 can be achieved by setting up a dual IC + dual MOSFET configuration. In this case, battery 21 has two protection ICs (U1 and U2) and two matching MOSFETs (Q1 and Q2). However, when implementing the control module function in this system, only one of the protection ICs needs to be modified (e.g., Figure 5(U1 in the example). This is because when the protection IC fails, the MOS transistor Q1 it controls is turned off by default, which means that the charging and discharging circuit of battery 21 will be cut off. At this time, even if the swelling detection of battery 21 fails due to the failure of the protection IC, there will be no safety risk caused by the swelling battery 21 continuing to work. Therefore, there is no need to modify the other protection IC to implement the control module function as described in this embodiment, which further reduces the implementation difficulty and the size of the control circuit.
[0088] In this embodiment, the control module reuses the original protection IC of the battery 21, which can cut off the charging and discharging circuit of the battery 21 when needed, thereby achieving the protection function of stopping the continued use of the battery 21 that has swollen. Since the function of the protection IC is limited, the specific detection of whether the battery 21 is swollen and the location of the swelling are implemented by the processor in the electronic device in which the battery 21 is used, avoiding the introduction of additional control devices, further simplifying the circuit structure, and reducing the difficulty and cost of implementation.
[0089] Furthermore, the above embodiments do not limit the implementation of the conductive component 11; the conductive component 11 can be an exposed pad, conductive contact, probe, etc. However, due to the limited size of battery products, the conductive component 11 in this system needs to be disposed on the surface of the battery 21 and needs to maintain a certain distance from the conductive layer 12. Therefore, higher requirements are placed on the volume of the conductive component 11 and the conductive film. Based on this, this embodiment provides an optional embodiment for the conductive component 11, such as... Figure 2 As shown:
[0090] The conductive component 11 is an exposed pad on the flexible printed circuit (FPC) 13, which is disposed on the surface of the battery 21; the battery protection chip and the resistor network are disposed on the battery protection board; the flexible printed circuit 13 and the battery protection board are connected by gold fingers 14.
[0091] In this embodiment, the conductive component 11 is an exposed pad on the FPC 13. "Exposed" ensures that an electrical connection can be established when the pad contacts the conductive layer 12. The thinness and flexibility of the FPC 13 ensure that when the battery 21 expands, the exposed pad near the expansion site is lifted to contact the conductive layer 12, achieving a short circuit. Furthermore, since the protection IC of the battery 21 is reused as a control module in the above embodiment, the protection IC is placed on the battery protection board, and the resistor network is also placed on the battery protection board for integration. However, the battery protection board typically cannot be on the same board as the FPC 13 where the conductive component 11 is located (the battery protection board contains other components, requiring space; the space inside the battery compartment is insufficient, and this would affect the contact between the exposed pad and the conductive layer 12). Therefore, in practical applications, the battery protection board and the FPC 13 are usually separate components. Since the conductive component 11 on the FPC 13 needs to establish a connection with the resistor network on the battery protection board, this embodiment uses a gold finger 14 (such as...) Figure 2 The shown gold fingers 14 and Figure 3 J2 in the middle realizes the electrical connection between the two boards.
[0092] Further such as Figure 5 As shown, one possible example is: the battery 21 is installed inside the battery compartment 20 (this battery compartment 20 can be the battery compartment 20 that comes with the battery product itself, or the battery compartment 20 in the electronic device in which the battery 21 is used), and an FPC 13 is attached to its outer surface (the side near the back cover 22 of the battery compartment 20). The side of the FPC 13 with exposed solder pads faces outwards (…). Figure 5 The structure shown does not have the back cover 22 installed, and the FPC13 and the exposed pads on it are visible. In this case, the conductive layer 12 can be placed on the inner surface of the back cover 22.
[0093] Based on this, this embodiment also provides an optional solution for the specific implementation of the conductive layer 12, wherein the conductive layer 12 is: the metal back shell of the battery compartment 20, or a conductive film disposed on the side of the non-metallic back shell of the battery compartment 20 near the conductive component 11.
[0094] That is, when the back cover 22 of the battery compartment 20 where the battery 21 is installed is made of metal, the metal back cover 22 can conduct electricity. One possible structure of the metal back cover 22 is as follows: Figure 6 As shown. That is, when the battery 21 expands and squeezes the exposed pads on the FPC13 to contact the metal back cover 22, the multiple exposed pads that are simultaneously in contact with the back cover 22 are short-circuited. Similarly, when the battery compartment 20 uses a non-metallic material such as ceramic for the back cover 22, the same effect can be achieved by setting a conductive film on the inner surface of the back cover 22.
[0095] The conductive layer 12 provided in this embodiment reuses the back shell 22 of the battery compartment 20 of the electronic device in which the battery product or battery 21 is applied as the conductive layer 12 (it can be directly through the metal back shell 22 or by attaching a conductive film to the non-conductive back shell 22), further reducing the impact of the increased size of the battery product caused by this system, which is beneficial to controlling the size of the battery product and can be applied in a wider range of scenarios.
[0096] The above embodiments have described a battery swelling protection system in detail. This application also provides an embodiment corresponding to a battery product. The battery product provided in this embodiment is as follows: Figure 5 As shown, the battery includes the battery expansion protection system provided in any of the above embodiments, as well as the battery body 21. For some battery products with their own casing, structural components such as the battery compartment 20 and the back cover 22 may also be included; this embodiment does not impose any limitations on this.
[0097] Since the embodiments of the battery product section correspond to the embodiments of the battery expansion protection system section, please refer to the description of the embodiments of the battery expansion protection system section for the embodiments of the battery product section, which will not be repeated here.
[0098] The battery product provided in this application can detect the expansion of the battery body 21 through its included battery expansion protection system, thereby better ensuring the personal and property safety of users. Furthermore, the entire circuit eliminates the need for pressure sensors, light sensors, or detection circuits, resulting in a simpler circuit structure, lower cost, and more controllable circuit size. Compared to battery products using other battery expansion protection schemes, this battery product is smaller, easier to manufacture, and less expensive, making it suitable for use in various terminal devices that are trending towards miniaturization.
[0099] The foregoing provides a detailed description of a battery swelling protection system and battery product provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.
[0100] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. A battery swelling protection system, characterized in that, include: Conductive components, conductive layer, detection module, and control module; The conductive component is at least two; each conductive component is disposed at a different position on the same surface of the battery, and no two conductive components are in contact with each other. The conductive layer is spaced apart from the conductive component; The detection module is connected to each of the conductive components and is used to detect whether the conductive components are short-circuited through the conductive layer. The control module is connected to the detection module and is used to control the working state of the battery based on the detection results of the detection module.
2. The battery swelling protection system according to claim 1, characterized in that, The number of the conductive components is three or more; The detection module is also used to: determine the location of the conductive component that is shorted by the conductive layer.
3. The battery swelling protection system according to claim 2, characterized in that, The conductive component includes a central component and multiple positioning components; The central component is located at the middle part of the battery surface, and each of the positioning components is arranged around the central component.
4. The battery swelling protection system according to claim 3, characterized in that, The detection module includes a resistor network; When the conductive components are short-circuited, the resistance of the resistor network changes; and when two different conductive components are short-circuited, the resistance of the resistor network changes differently.
5. The battery swelling protection system according to claim 4, characterized in that, The resistor network includes: multiple resistors connected in series; Each of the conductive components is connected to a different circuit node in the resistor network.
6. The battery swelling protection system according to claim 4, characterized in that, The resistor network includes multiple resistors connected in parallel, each resistor having a different resistance value; Each resistor branch has two electrical connection nodes, a first node and a second node, forming a default disconnected electrical isolation structure; and the first node in each resistor branch is connected to the central component, while the second node in each resistor branch is connected to different positioning components.
7. The battery swelling protection system according to any one of claims 4 to 6, characterized in that, The control module includes: a battery protection chip for the battery, and a switching transistor disposed in the charging and discharging circuit of the battery; The detection module includes: a host computer; The host computer is connected to the resistor network and is used to: determine the positions of the short-circuited conductive components according to the resistance value of the resistor network, and send a cut-off command to the battery protection chip when a conductive component is short-circuited. The battery protection chip is used to control the switching transistor to cut off the charging and discharging circuit of the battery when the cut-off command is received.
8. The battery swelling protection system according to claim 7, characterized in that, The conductive component is an exposed pad on a flexible circuit board, and the flexible circuit board is disposed on the surface of the battery; The battery protection chip and the resistor network are disposed on the battery protection board; The flexible circuit board is connected to the battery protection board via gold fingers.
9. The battery swelling protection system according to claim 1, characterized in that, The conductive layer is: the metal back shell of the battery compartment, or a conductive film disposed on the side of the non-metallic back shell of the battery compartment near the conductive component.
10. A battery product, characterized in that, Includes the battery swelling protection system as described in any one of claims 1 to 9.