Fusing protection device, acquisition system and energy storage product

Abstract

The utility model relates to a fusing protection device, an acquisition system and an energy storage product. The fusing protection device is configured in an acquisition system, the acquisition system comprises a plurality of first fuses, one ends of the first fuses are connected with battery units which are connected in series in corresponding battery strings in the acquisition system, and the other ends of the first fuses are connected with a sampling interface of an acquisition chip in the acquisition system; the fusing protection device comprises a plurality of protection fuse units, one end of each protection fuse unit is connected between one end of the first fuse and the battery unit, and the other end of each protection fuse unit is connected between the other end of the first fuse and the sampling interface; and the control end of the protection fuse unit is connected with the acquisition chip, so that the protection fuse unit enters a corresponding working state, protection is carried out under the condition that the acquisition system has a broken line fault, the risk of PACK failure of the battery pack is reduced, and the safety and reliability of the FPC and the CCS are improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a fuse protection device, a collection system and an energy storage product. Background Art

[0002] At present, full-cell voltage and full-temperature sampling often adopts wiring harness solutions. In order to improve the sampling integration of the battery pack PACK, the traditional solution uses the high integration and standardized layout of FPC (Flexible Printed Circuit) to integrate fuses and NTC (Negative Temperature Coefficient) sampling resistors on the FPC, and integrates the CCS (Cells Contact System) module with plastic structural parts and copper busbars to improve the integration of the entire battery pack PACK.

[0003] However, as the integration of battery packs PACKs increases, the risk of failure also increases, resulting in low safety and reliability of FPCs and CCSs. Utility Model Content

[0004] Based on this, it is necessary to provide a fuse protection device, collection system and energy storage product that can improve the safety and reliability of FPC and CCS.

[0005] In a first aspect, the present application provides a fuse protection device, which is configured in an acquisition system, wherein the acquisition system includes a plurality of first fuses, one end of the first fuse is connected to a corresponding battery unit, and the other end of the first fuse is connected to a sampling interface of an acquisition chip in the acquisition system; the fuse protection device includes:

[0006] Multiple protection fuse units, one end of the protection fuse unit is connected between one end of the first fuse and the battery unit, and the other end of the protection fuse unit is connected between the other end of the first fuse and the sampling interface; the control end of the protection fuse unit is connected to the acquisition chip to enable the protection fuse unit to enter a corresponding working state.

[0007] In one embodiment, the number of protection fuse units is equal to the number of first fuses; the protection fuse unit includes:

[0008] A control switch, wherein a first moving end of the control switch is connected to a collection chip;

[0009] A second fuse, one end of the second fuse is connected between one end of the first fuse and the battery unit, and the other end of the second fuse is connected to the second movable end of the control switch;

[0010] The fixed end of the control switch is connected between the other end of the first fuse and the sampling interface.

[0011] In one embodiment, the first movable end of the control switch is connected to the GPIO interface of the acquisition chip.

[0012] In one embodiment, the first movable end of the control switch is connected to the acquisition chip through a GPIO expansion circuit.

[0013] In the second aspect, the present application also provides an acquisition system, which includes multiple first fuses, one end of the first fuse is connected to the corresponding battery unit, and the other end of the first fuse is connected to the sampling interface of the acquisition chip in the acquisition system; the acquisition system also includes the above-mentioned fuse protection device.

[0014] In one embodiment, the acquisition system further includes:

[0015] The temperature detection circuit has one end connected to the acquisition chip and the other end connected to the ground.

[0016] In one embodiment, the temperature detection circuit includes:

[0017] Multiple resistors;

[0018] A plurality of cell temperature sampling NTC resistors respectively corresponding to the plurality of resistors, one end of the cell temperature sampling NTC resistor is connected to the acquisition chip through the corresponding resistor, and the other end of the cell temperature sampling NTC resistor is used for grounding.

[0019] In one of the embodiments, the acquisition system is integrated on the FPC board.

[0020] In one embodiment, the acquisition chip is an AFE acquisition chip.

[0021] In a third aspect, the present application also provides an energy storage product, which includes the collection system as described above.

[0022] The above-mentioned fuse protection device, collection system and energy storage product, the fuse protection device is configured in the collection system, the collection system includes multiple first fuses, one end of the first fuse is connected to the battery cells connected in series in the corresponding battery string in the collection system, and the other end of the first fuse is connected to the sampling interface of the collection chip in the collection system; the fuse protection device includes multiple protection fuse units, one end of the protection fuse unit is connected between one end of the first fuse and the battery cell, and the other end of the protection fuse unit is connected between the other end of the first fuse and the sampling interface; the control end of the protection fuse unit is connected to the collection chip to enable the protection fuse unit to enter the corresponding working state; the present application is configured with a fuse protection device to provide protection in the event of a line break failure in the collection system, thereby reducing the risk of failure of the battery pack PACK and improving the safety and reliability of FPC and CCS. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of an existing acquisition system in an embodiment;

[0025] Figure 2 It is a structural schematic diagram of a collection system equipped with a fuse protection device in one embodiment;

[0026] Figure 3 A schematic diagram of the structure of a fuse protection device in one embodiment;

[0027] Figure 4 A schematic diagram of the structure of a fuse protection device in another embodiment;

[0028] Figure 5 FIG. 4 is a flowchart of a collection system in one embodiment. DETAILED DESCRIPTION

[0029] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] It is understood that the terms "first", "second", etc. used in this application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, the first fuse can be referred to as the second fuse, and similarly, the second fuse can be referred to as the first fuse. Both the first fuse and the second fuse are fuses, but they are not the same fuse.

[0032] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0033] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0034] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0035] Currently, if Figure 1 As shown, the energy storage industry is still in the process of updating and iterating from traditional wiring harnesses to FPC wiring harness solutions. The current more mature FPC solutions generally integrate fuses and cell temperature sampling NTC resistors on the FPC, and integrate CCS modules with plastic structural parts and copper green bars. Although the integration is greatly improved, the risk of failure also increases at the same time, and there are problems with the low safety and reliability of FPC and CCS.

[0036] Furthermore, since most existing FPC solutions integrate fuses on the FPC, when the BMU (Battery Management Unit) board breaks down the TVS (Transient Voltage Suppressor) or TVS diode inside the AFE chip due to interference, it will generally cause the fuse on the sampling link to blow to protect the battery. Figure 1 As shown, when the fuse on the sampling circuit is damaged, the entire battery pack PACK must be removed, and the FPC and BMU board must be replaced to maintain the faulty battery pack PACK, which has the problem of high maintenance cost.

[0037] The present application relates to a fuse protection device, a collection system and an energy storage product. By configuring the fuse protection device in the collection system, in the event of a fault, the collection system is protected by the fuse protection device, without the need to remove the entire battery pack PACK and replace the FPC and BMU board to maintain the faulty battery pack PACK, thereby reducing maintenance costs and improving the safety and reliability of the battery pack PACK (FPC, CCS).

[0038] In an exemplary embodiment, Figure 2 As shown, a fuse protection device is provided, which is configured in an acquisition system. The acquisition system includes a plurality of first fuses, one end of the first fuse is connected to a corresponding battery unit, and the other end of the first fuse is connected to a sampling interface of an acquisition chip in the acquisition system; the fuse protection device includes:

[0039] Multiple protection fuse units, one end of the protection fuse unit is connected between one end of the first fuse and the battery unit, and the other end of the protection fuse unit is connected between the other end of the first fuse and the sampling interface; the control end of the protection fuse unit is connected to the acquisition chip to enable the protection fuse unit to enter a corresponding working state.

[0040] Specifically, Figure 2 As shown, the acquisition system can acquire the cell voltage (Vc1, Vc2...Vcn-1, Vcn) and cell temperature (NTC (1), NTC (n-1), NTC (n) etc.) of multiple battery cells (BAT1, BAT2...BATn-1, BATn) in the battery pack PACK through the acquisition chip. The acquisition system includes multiple first fuses (F1, F2...Fn-1, Fn). The first fuse is set in the circuit for acquiring the cell voltage, wherein one end of the first fuse is connected to the corresponding battery cell, and the other end of the first fuse is connected to the acquisition cell in the acquisition system. The acquisition system can also be configured with a fuse protection device, which can include multiple protection fuse units, one end of the protection fuse unit is connected between one end of the first fuse and the battery unit, and the other end of the protection fuse unit is connected between the other end of the first fuse and the sampling interface; the control end of the protection fuse unit is connected to the acquisition chip, and the acquisition chip can instruct the protection fuse unit to enter the corresponding working state to protect the battery unit when the BMU board breaks down the TVS inside the acquisition chip due to interference, without removing the entire battery pack PACK and replacing the BMU board, thereby reducing maintenance costs.

[0041] In the embodiment of the present application, a fuse protection device is configured in the acquisition system, one end of each protection fuse unit in the fuse protection device is connected between one end of the first fuse and the battery unit, and the other end is connected between the other end of the first fuse and the sampling interface, and the control end is connected to the acquisition chip to enable the protection fuse unit to enter a corresponding working state to protect the battery unit. Furthermore, the setting of the fuse protection device makes the acquisition system lightweight and highly integrated, with a regular layout, while reducing the risk of failure of the battery pack PACK, increasing the safety and reliability of the battery pack PACK, and improving the safety and reliability of FPC and CCS.

[0042] In one embodiment, if Figure 3As shown, the number of protection fuse units is equal to the number of first fuses; the protection fuse unit includes:

[0043] A control switch, wherein a first moving end of the control switch is connected to a collection chip;

[0044] A second fuse, one end of the second fuse is connected between one end of the first fuse and the battery unit, and the other end of the second fuse is connected to the second movable end of the control switch;

[0045] The fixed end of the control switch is connected between the other end of the first fuse and the sampling interface.

[0046] Specifically, the number of protection fuse units corresponds to the number of first fuses, and each first fuse can be connected in parallel with a protection fuse unit. Figure 3 As shown, the protection fuse unit includes a control switch (K1, K2...Kn-1, Kn), and the control switch Kn is used as an example for explanation. The first moving end b of the control switch Kn can be connected to the acquisition chip, and the acquisition chip can output a corresponding control signal to the control switch Kn to instruct the control switch Kn to close or turn off, thereby improving the safety of the FPC and CCS; the protection fuse unit also includes a second fuse (FD1, FD2...FDn-1, FDn), and the second fuse FDn is used as an example for explanation. One end of the second fuse FDn is connected between one end of the first fuse Fn and the battery cell BATn, and the other end of the second fuse FDn is connected to the second moving end a of the control switch Kn, and the fixed end c of the control switch Kn is connected between the other end of the first fuse Fn and the sampling interface. In the event of a fault, the acquisition chip can instruct the control switch to close, so that the second fuse is blown to protect the battery cell.

[0047] It should be noted that the functions of other control switches and the second fuse are similar to those described above and will not be described in detail in the embodiments of the present application.

[0048] In an embodiment of the present application, the protection fuse unit includes a control switch and a second fuse, wherein the control switch can be closed or turned off according to the instruction of the acquisition chip, so that in the event of a fault, the acquisition chip instructs the control switch to be closed to cause the second fuse to blow to protect the battery unit. That is, by adopting an FPC solution with built-in dual-fuse redundant protection, it is lightweight and highly integrated, with a regular layout, while greatly reducing maintenance costs, reducing the risk of failure of the battery pack PACK, increasing the safety and reliability of the battery pack PACK, and improving the safety and reliability of the FPC and CCS.

[0049] In one embodiment, the first movable end of the control switch is connected to a GPIO (General-purpose input / output) interface of the acquisition chip.

[0050] Specifically, if Figure 3 As shown, taking the control switch Kn as an example, the first moving end b of the control switch Kn is connected to the GPIO interface of the acquisition chip, that is, the pin (first moving end) of the control switch can be provided with a control signal by the GPIO interface of the acquisition chip, so that in the event of a fault, the battery unit can be protected by the fuse protection device.

[0051] In the embodiment of the present application, the first moving end of the control switch is connected to the GPIO interface of the acquisition chip. The acquisition chip instructs the control switch to perform corresponding actions through the GPIO interface, so that in the event of a fault, the fuse protection device is instructed to protect the battery unit without replacing the FPC and CCS, thereby improving the safety and reliability of the FPC and CCS.

[0052] In one embodiment, the first movable end of the control switch is connected to the acquisition chip through a GPIO expansion circuit.

[0053] Specifically, Figure 4 As shown, when the number of GPIO interfaces of the acquisition chip is small, the acquisition chip can be connected to the GPIO expansion circuit through the communication interface. Taking the control switch Kn as an example, the first moving end b of the control switch Kn can be connected to the acquisition chip through the GPIO expansion circuit, that is, the pin (first moving end) of the control switch can be provided with a control signal by the acquisition chip through the GPIO expansion circuit, so that in the event of a fault, the battery unit can be protected by the fuse protection device.

[0054] Exemplarily, the communication interface of the acquisition chip can communicate with the GPIO expansion circuit by using communication methods such as IIC (Inter-Integrated Circuit), CAN (Controller Area Network), and SPI (Serial Peripheral Interface).

[0055] Optionally, the acquisition chip can also provide a control signal to the GPIO expansion chip. The GPIO expansion chip and the acquisition chip are controlled by using common communication methods such as IIC, SPI, UART (Universal Asynchronous Receiver / Transmitter), CAN, etc.; the first moving end of the control switch can be connected to the acquisition chip through the GPIO expansion chip to achieve protection of the battery unit.

[0056] In the embodiment of the present application, the first moving end of the control switch is connected to the acquisition chip through the GPIO expansion circuit, which is suitable for acquisition chips with fewer GPIO interfaces and reduces the problem of tight GPIO resources of the acquisition chip.

[0057] In a second aspect, the present application also provides a collection system, such as Figure 2 As shown, the acquisition system includes multiple first fuses, one end of the first fuse is connected to the corresponding battery unit, and the other end of the first fuse is connected to the sampling interface of the acquisition chip in the acquisition system; the acquisition system also includes the above-mentioned fuse protection device.

[0058] Specifically, the acquisition system may include multiple first fuses (F1, F2...Fn-1, Fn), and the first fuse may be set in a circuit for collecting battery cell voltages, wherein one end of the first fuse is connected to the corresponding battery unit, and the other end of the first fuse is connected to the sampling interface of the acquisition chip in the acquisition system; the acquisition system may also be configured with a fuse protection device, the function of the fuse protection device is as described above, and will not be repeated in the embodiments of the present application.

[0059] In the embodiment of the present application, a fuse protection device is configured in the acquisition system, and the fuse protection device is connected to the acquisition chip, so that the protection fuse unit enters the corresponding working state, protects the battery unit, reduces the risk of battery pack PACK failure, increases the safety and reliability of the battery pack PACK, and improves the safety and reliability of FPC and CCS.

[0060] In one embodiment, the acquisition system further includes:

[0061] The temperature detection circuit has one end connected to the acquisition chip and the other end connected to the ground.

[0062] Specifically, the acquisition system can acquire the temperature of the battery cell through a temperature detection circuit, wherein one end of the temperature detection circuit is connected to the acquisition chip, and the other end of the temperature detection circuit is used for grounding.

[0063] In the embodiment of the present application, the acquisition system can collect the battery cell temperature through the temperature detection circuit, check whether a line break fault occurs, and instruct the fuse protection device to enter the corresponding working state when a line break fault occurs, so as to protect the battery unit and improve the safety and reliability of FPC and CCS.

[0064] In one embodiment, the temperature detection circuit includes:

[0065] Multiple resistors;

[0066] A plurality of cell temperature sampling NTC resistors respectively corresponding to the plurality of resistors, one end of the cell temperature sampling NTC resistor is connected to the acquisition chip through the corresponding resistor, and the other end of the cell temperature sampling NTC resistor is used for grounding.

[0067] Among them, the resistance values ​​of multiple resistors can be set according to actual conditions and are not limited in the embodiments of the present application.

[0068] Specifically, Figure 2 As shown, the temperature detection circuit may include multiple resistors Rp, and multiple battery cell temperature sampling NTC resistors (R1...R(n-1), R(n)) corresponding to the multiple resistors Rp respectively. One end of the battery cell temperature sampling NTC resistor is connected to the acquisition chip through the corresponding resistor, and the other end of the battery cell temperature sampling NTC resistor is used for grounding.

[0069] Exemplarily, one end of the cell temperature sampling NTC resistor is connected to a preset interface (e.g., TSREF) of the acquisition chip through a corresponding resistor; it should be noted that TSREF can be used to provide a 5V bias voltage for the cell temperature sampling NTC resistor (NTC thermistor); when the GPIO interface is configured to monitor the temperature of the NTC thermistor, connect TSREF to the top of the NTC resistor divider network.

[0070] Optionally, the acquisition chip can collect the battery cell temperature through corresponding interfaces (NTC (1), NTC (n-1), NTC (n)).

[0071] In an embodiment of the present application, the cell temperature is collected by a temperature detection circuit including multiple resistors and multiple cell temperature sampling NTC resistors corresponding one-to-one to the multiple resistors, so as to facilitate subsequent fault judgment, thereby improving the safety and reliability of FPC and CCS.

[0072] In one of the embodiments, the acquisition system is integrated on the FPC board.

[0073] Specifically, the acquisition system can be integrated on the FPC board. By configuring a fuse protection device in the acquisition system, the control end of the protection fuse unit in the fuse protection device is connected to the acquisition chip, so that the protection fuse unit enters the corresponding working state, and plays a protective role in the event of a line break failure in the acquisition system, so that there is no need to remove the entire battery pack PACK and replace the FPC and BMU board, which reduces maintenance costs and improves the safety and reliability of FPC and CCS.

[0074] In one embodiment, the acquisition chip is an AFE acquisition chip.

[0075] Specifically, the acquisition chip may be an AFE (Analog Front End) acquisition chip. Optionally, the acquisition chip may also be other chips that can be used to collect cell voltage and cell temperature, which is not limited in the embodiments of the present application.

[0076] In order to facilitate the understanding of those skilled in the art, the workflow of the acquisition system is described below with reference to a specific example. Figure 5 As shown:

[0077] The acquisition system starts to work. The AFE acquisition chip collects the cell voltage and temperature and determines whether a disconnection fault occurs. If there is no disconnection fault, the AFE acquisition chip continues to collect the cell voltage and temperature. If a disconnection fault occurs, check and replace the BMU. The AFE acquisition chip can control the GPIO or GPIO expansion chip to open the protective redundant fuse (second fuse) on the corresponding acquisition link, and then continue to collect the cell voltage and temperature or end the acquisition.

[0078] In an exemplary embodiment, an energy storage product is also provided. The energy storage product includes the collection system as described above.

[0079] It should be noted that the energy storage product may be a battery pack PACK, or other energy storage products equipped with a battery pack PACK, such as new energy vehicles.

[0080] In the embodiment of the present application, the energy storage product includes a collection system, and the collection system is equipped with a fuse protection device. The FPC solution with built-in dual-fuse redundant protection is adopted. It is lightweight and highly integrated. While having a regular layout, it will also greatly improve the safety of the energy storage product, greatly reduce maintenance costs, reduce the risk of battery pack PACK failure, and increase the reliability of the battery pack PACK, thereby improving the market competitiveness of the entire energy storage product.

[0081] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0082] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A fuse protection device, characterized in that: The fuse protection device is configured in the acquisition system, and the acquisition system includes a plurality of first fuses, one end of the first fuse is connected to the corresponding battery unit, and the other end of the first fuse is connected to the sampling interface of the acquisition chip in the acquisition system; The fuse protection device comprises: A plurality of protection fuse units, one end of each protection fuse unit is connected between one end of each first fuse and each battery unit, and the other end of each protection fuse unit is connected between the other end of each first fuse and each sampling interface; a control end of each protection fuse unit is connected to each acquisition chip to enable each protection fuse unit to enter a corresponding working state; The number of the protection fuse units is equal to the number of the first fuses; the protection fuse unit includes: A control switch, wherein a first movable end of the control switch is connected to the acquisition chip; a second fuse, one end of the second fuse being connected between one end of the first fuse and the battery unit, and the other end of the second fuse being connected to a second movable end of the control switch; The fixed end of the control switch is connected between the other end of the first fuse and the sampling interface.

2. The fuse protection device according to claim 1, characterized in that: The first movable end of the control switch is connected to the GPIO interface of the acquisition chip.

3. The fuse protection device according to claim 1, characterized in that: The first movable end of the control switch is connected to the acquisition chip through a GPIO expansion circuit.

4. A collection system, characterized in that: The acquisition system includes multiple first fuses, one end of the first fuse is connected to the corresponding battery unit, and the other end of the first fuse is connected to the sampling interface of the acquisition chip in the acquisition system; the acquisition system also includes the fuse protection device as described in any one of claims 1 to 3.

5. The acquisition system according to claim 4, characterized in that: The acquisition system also includes: A temperature detection circuit, one end of which is connected to the acquisition chip, and the other end of which is grounded.

6. The acquisition system according to claim 5, characterized in that: The temperature detection circuit comprises: Multiple resistors; A plurality of cell temperature sampling NTC resistors corresponding to the plurality of resistors respectively, one end of the cell temperature sampling NTC resistor is connected to the acquisition chip through the corresponding resistor, and the other end of the cell temperature sampling NTC resistor is used for grounding.

7. The acquisition system according to claim 6, characterized in that: The acquisition system is integrated on the FPC board.

8. The acquisition system according to any one of claims 4 to 7, characterized in that: The acquisition chip is an AFE acquisition chip.

9. An energy storage product, characterized in that: The energy storage product comprises the collection system according to any one of claims 4 to 8.

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