Storage battery grouping isolation safety protection device

Abstract

The invention provides a storage battery grouping isolation safety protection device, and relates to the technical field of storage battery grouping isolation, and the device is characterized in that the second end of a first branch circuit is connected with the positive electrode of a first sub-battery pack; the first end of the second branch circuit is connected with the anode of the first sub-battery pack, the second end of the second branch circuit is connected with the anode input end of the capacity checking host, and the third end of the second branch circuit is connected with the cathode of the first sub-battery pack and the anode of the second sub-battery pack; the first end of the third branch circuit is connected with the third end of the second branch circuit, the second end of the third branch circuit is connected with the cathode input end of the capacity checking host, and the third end of the third branch circuit is connected with the cathode of the second sub battery pack; the first end of the fourth branch circuit is connected with the third end of the third branch circuit, and the second end of the fourth branch circuit is connected with the negative electrode of external charging and discharging equipment; thermal runaway of the storage battery can be managed, and accidents caused by thermal runaway of the storage battery are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of battery grouping isolation, and in particular to a battery grouping isolation safety protection device. Background Art

[0002] At present, the State Grid communication system uses 48V battery packs as system backup power. The battery packs must be discharged and inspected regularly. In order to prevent power outages at the end of battery discharge inspection (battery emptying) that may cause power outages in the communication system, the 48V battery packs need to be grouped and recharged. In order to prevent battery performance degradation and risks, it is necessary to use batteries from the same manufacturer and the same batch to form battery packs. This will increase the cost of the batteries. In order to reduce costs and increase battery recycling rates, batteries should be able to be charged in groups to solve the problem of mixed use of batteries. However, mixed use of batteries will have a certain risk of thermal runaway. How to manage battery thermal runaway and avoid accidents caused by battery thermal runaway has become an urgent problem to be solved. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a battery group isolation safety protection device to manage battery thermal runaway and avoid accidents caused by battery thermal runaway.

[0004] According to a first aspect of the present application, a battery group isolation safety protection device is provided, comprising: a first branch circuit, a second branch circuit, a third branch circuit and a fourth branch circuit; wherein the first end of the first branch circuit is used to connect to the positive electrode of an external charging and discharging device, and the second end of the first branch circuit is connected to the positive electrode of the first sub-battery group; The first end of the second branch circuit is connected to the positive electrode of the first sub-battery group, the second end of the second branch circuit is connected to the positive input terminal of the core capacity host, and the third end of the second branch circuit is connected to the negative electrode of the first sub-battery group and the positive electrode of the second sub-battery group; The first end of the third branch circuit is connected to the third end of the second branch circuit, the second end of the third branch circuit is connected to the negative input end of the core capacity host, and the third end of the third branch circuit is connected to the negative electrode of the second sub-battery group; The first end of the fourth branch circuit is connected to the third end of the third branch circuit, and the second end of the fourth branch circuit is used to connect to the negative electrode of an external charging and discharging device; The first branch circuit and the fourth branch circuit are used to control the charging and discharging of the first sub-battery group and the second sub-battery group; the second branch circuit and the third branch circuit are used to control the first sub-battery group or the second sub-battery group to perform capacity control.

[0005] Optionally, the first branch circuit includes: A first diode and a first switching device; wherein the anode of the first diode is connected to the first end of the second branch circuit and the first end of the first switching device, and the second end of the first switching device is connected to the cathode of the first diode; the cathode of the first diode is used to connect to the anode of an external charging and discharging device.

[0006] Optionally, the first switching device includes a contactor.

[0007] Optionally, the second branch circuit includes: A second switch device and a third switch device; wherein the first end of the second switch device is connected to the second end of the first branch circuit, the second end of the second switch device is connected to the first end of the third switch device, and the second end of the third switch device is connected to the first end of the third branch circuit; the second end of the second switch device is connected to the positive input end of the core capacity host.

[0008] Optionally, the second switching device includes a contactor, and the third switching device includes a contactor.

[0009] Optionally, the third branch circuit includes: A fourth switch device and a fifth switch device; wherein the first end of the fourth switch device is connected to the third end of the second branch circuit, the second end of the fourth switch device is connected to the first end of the fifth switch device, and the second end of the fifth switch device is connected to the first end of the fourth branch circuit; the second end of the fourth switch device is connected to the negative input end of the core capacity host.

[0010] Optionally, the fourth switching device includes a contactor, and the fifth switching device includes a contactor.

[0011] Optionally, the fourth branch circuit includes: A second diode and a sixth switching device; wherein the anode of the second diode is connected to the first end of the sixth switching device, and the second end of the sixth switching device is connected to the cathode of the second diode and the third end of the third branch circuit; the anode of the second diode is used to connect to the cathode of an external charging and discharging device.

[0012] Optionally, the sixth switching device includes a contactor.

[0013] Optionally, the device also includes: a first resistor, one end of the first resistor is connected to the negative electrode of the first sub-battery group and the positive electrode of the second sub-battery group, and the other end of the first resistor is connected to the third end of the second branch circuit and the first end of the third branch circuit.

[0014] The present invention has at least the following beneficial effects: The battery grouping isolation safety protection device of the present invention is such that when the first sub-battery group and the second sub-battery group operate normally, the first branch circuit and the fourth branch circuit are internally connected, and the second branch circuit and the third branch circuit are internally disconnected, so that the first sub-battery group and the second sub-battery group can be connected to an external charging and discharging device and operate normally; when the first sub-battery group needs to be capacitated, the second branch circuit and the third branch circuit control the first sub-battery group to be connected to the capacitated host to realize the capacitated operation of the first sub-battery group; when the second sub-battery group needs to be capacitated, the second branch circuit and the third branch circuit control the second sub-battery group to be connected to the capacitated host to realize the capacitated operation of the second sub-battery group.

[0015] Furthermore, when the capacity of the first sub-battery group or the second sub-battery group is checked, the first branch circuit and the fourth branch circuit can control the first sub-battery group and the second sub-battery group to operate online at the same time; and when the first sub-battery group and the second sub-battery group are in a thermal runaway state, the first branch circuit and the fourth branch circuit can control the charging circuit of the first sub-battery group and the second sub-battery group to be disconnected; thereby reducing the risk of thermal runaway when the batteries are mixed, and managing the thermal runaway of the batteries to avoid accidents caused by thermal runaway of the batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the circuit structure of a battery group isolation safety protection device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the circuit structure of another battery grouping isolation safety protection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement a device and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0020] In one embodiment, a method is provided as follows Figure 1 The battery group isolation safety protection device shown in the figure comprises: The first branch circuit 100, the second branch circuit 200, the third branch circuit 300 and the fourth branch circuit 400; wherein the first end A1 of the first branch circuit 100 is used to connect the positive electrode of the external charging and discharging device, and the second end A1 of the first branch circuit 100 is connected to the positive electrode of the first sub-battery group E1; the first end B1 of the second branch circuit 200 is connected to the positive electrode of the first sub-battery group E1, the second end B2 of the second branch circuit 200 is connected to the positive input end of the core capacity host, and the third end B3 of the second branch circuit is connected to the negative electrode of the first sub-battery group and the positive electrode of the second sub-battery group E2; the first end C1 of the third branch circuit 300 is connected to the first end B2 of the second branch circuit 200 Three terminals B3, the second terminal C2 of the third branch circuit 300 is connected to the negative input terminal of the core capacity host, and the third terminal C3 of the third branch circuit 300 is connected to the negative electrode of the second sub-battery group E2; the first terminal F1 of the fourth branch circuit 400 is connected to the third terminal C3 of the third branch circuit 300, and the second terminal F2 of the fourth branch circuit 400 is used to connect the negative electrode of an external charging and discharging device; the first branch circuit 100 and the fourth branch circuit 400 are used to control the charging and discharging of the first sub-battery group E1 and the second sub-battery group E2; the second branch circuit 200 and the third branch circuit 300 are used to control the first sub-battery group E1 or the second sub-battery group E2 to perform core capacity.

[0021] In this embodiment, when the first sub-battery group and the second sub-battery group operate normally, the first branch circuit and the fourth branch circuit are internally connected, and the second branch circuit and the third branch circuit are internally disconnected, so that the first sub-battery group and the second sub-battery group are connected to the external charging and discharging equipment and operate normally; when the first sub-battery group needs to be capacitated, the second branch circuit and the third branch circuit control the first sub-battery group to be connected to the capacitated host to realize the capacitated first sub-battery group; when the second sub-battery group needs to be capacitated, the second branch circuit and the third branch circuit control the second sub-battery group to be connected to the capacitated host to realize the capacitated second sub-battery group.

[0022] In addition, when the capacity of the first sub-battery group or the second sub-battery group is checked, the first branch circuit and the fourth branch circuit can control the first sub-battery group and the second sub-battery group to operate online at the same time; and when the first sub-battery group and the second sub-battery group are in a thermal runaway state, the first branch circuit and the fourth branch circuit can control the charging circuit of the first sub-battery group and the second sub-battery group to be disconnected; thereby reducing the risk of thermal runaway when the batteries are mixed, and managing the thermal runaway of the batteries to avoid accidents caused by thermal runaway of the batteries.

[0023] In one embodiment, a method is provided as follows Figure 2 The battery group isolation safety protection device shown, the first branch circuit 100 includes: A first diode D1 and a first switch device S1; wherein the anode of the first diode D1 is connected to the first end of the second branch circuit 100 and the first end of the first switch device S1, and the second end of the first switch device S1 is connected to the cathode of the first diode D1; the cathode of the first diode D1 is used to connect to the anode of an external charging and discharging device; the first switch device S1 can be a switch device such as a contactor and a knife switch.

[0024] The second branch circuit 200 includes: a second switch device S2 and a third switch device S3; wherein the first end of the second switch device S2 is connected to the second end of the first branch circuit 100, that is, the positive electrode of the first diode D1; the second end of the second switch device S2 is connected to the first end of the third switch device S3, and the second end of the third switch device S3 is connected to the first end of the third branch circuit 300, that is, the first end of the fourth switch device S4; the second end of the second switch device S2 is connected to the positive input end of the core capacity host; the second switch device S2 can be a switch device such as a contactor and a knife switch, and the third switch device S3 can be a switch device such as a contactor and a knife switch.

[0025] The third branch circuit 300 includes: a fourth switch device S4 and a fifth switch device S5; wherein, the first end of the fourth switch device S4 is connected to the third end of the second branch circuit 200, the second end of the fourth switch device S4 is connected to the first end of the fifth switch device S5, and the second end of the fifth switch device S5 is connected to the first end of the fourth branch circuit 400, that is, the cathode of the second diode D2; the second end of the fourth switch device S4 is connected to the negative input end of the core capacity host; the fourth switch device S4 can be a switch device such as a contactor and a knife switch, and the fifth switch device S5 can be a switch device such as a contactor and a knife switch.

[0026] The fourth branch circuit 400 includes: a second diode D2 and a sixth switch device S6; wherein the anode of the second diode D2 is connected to the first end of the sixth switch device S6, and the second end of the sixth switch device S6 is connected to the cathode of the second diode D2 and the third end of the third branch circuit 300; the anode of the second diode D2 is used to connect the cathode of an external charging and discharging device; the sixth switch device S6 can be a switch device such as a contactor and a knife switch.

[0027] Furthermore, the device also includes: a first resistor R1, one end of the first resistor R1 is connected to the negative electrode of the first sub-battery group E1 and the positive electrode of the second sub-battery group E2, and the other end of the first resistor R1 is connected to the third end of the second branch circuit 200 and the first end of the third branch circuit 300; the first resistor R1 can play a role in current limiting.

[0028] The specific working process of the above battery group isolation safety protection device is as follows: (1) Normal operating status The first switch device S1 and the sixth switch device S6 are controlled to be in a closed state, and the second switch device S2, the third switch device S3, the fourth switch device S4 and the fifth switch device S5 are controlled to be in an open state. At this time, the core capacity host is not working, and the first sub-battery group E1 and the second sub-battery group E2 are connected in series and connected to an external charging and discharging device.

[0029] (2) The core capacity status of the first sub-battery group E1 The first switch device S1 and the sixth switch device S6 are controlled to be in the open state, the charging circuit of the first sub-battery group E1 and the second sub-battery group E2 is disconnected, the second switch device S2 and the fourth switch device S4 are controlled to be in the closed state, the third switch device S3 and the fifth switch device S5 are controlled to be in the open state, and the core capacity host is controlled to start; at this time, the first sub-battery group E1 can be cored; at the same time, due to the presence of the first diode D1 and the second diode D2, it can be ensured that the first sub-battery group E1 and the second sub-battery group E2 are connected in series and then discharged online; thereby, the core capacity of the first sub-battery group E1 is achieved under the premise of ensuring the normal online discharge of the battery group.

[0030] (3) Second sub-battery group E2 core capacity status The first switch device S1 and the sixth switch device S6 are controlled to be in the off state, the charging circuit of the first sub-battery group E1 and the second sub-battery group E2 is disconnected, the second switch device S2 and the fourth switch device S4 are controlled to be in the off state, the third switch device S3 and the fifth switch device S5 are controlled to be in the closed state, and the core capacity host is controlled to start; at this time, the second sub-battery group E2 can be cored; at the same time, due to the presence of the first diode D1 and the second diode D2, it can be ensured that the first sub-battery group E1 and the second sub-battery group E2 are connected in series and then discharged online; thereby, the core capacity of the second sub-battery group E2 is achieved under the premise of ensuring the normal online discharge of the battery group.

[0031] (4) Thermal runaway management status The first switch device S1 and the sixth switch device S6 are controlled to be in the disconnected state, and the second switch device S2, the third switch device S3, the fourth switch device S4 and the fifth switch device S5 are controlled to be in the disconnected state, the charging circuit of the first sub-battery group E1 and the second sub-battery group E2 are disconnected, and the core capacity host is controlled not to work; at this time, the first sub-battery group E1 and the second sub-battery group E2 are connected in series and then discharged online; at the same time, the first diode D1 and the second diode D2 can play a role in current limiting.

[0032] The battery group isolation safety protection device in the above embodiment has at least the following effects: The above-mentioned battery grouping isolation safety protection device is an independent external device and can be used alone; it does not change the battery structure, does not affect the switching power supply and the remote nuclear capacity system, and reduces the difficulty of construction; the battery is divided into two sub-battery groups through a set of power-free control circuits; the control circuit can send some of the sub-battery group batteries to the DC / DC module of the nuclear capacity host; it can realize the functions of single-cell isolation, group nuclear capacity, mixed use of cascade batteries, intermittent floating charge to extend life, and small current nuclear capacity.

[0033] In addition, it can protect the circuit to ensure that the battery can discharge normally online in all working modes and the entire battery group is online; it does not introduce new systemic risks, does not require DC / DC modules, does not consume battery power, and has no bottleneck in discharge power. It can realize thermal runaway analysis and control. The battery monitoring system determines whether the battery group has thermal runaway. The normally closed contactor disconnects the charging circuit to achieve control of thermal runaway. The online protection diode ensures that the battery can continue to discharge online; it reduces the line cost in remote nuclear capacity transformation; the device can also be used as a flexibly installed power supply line relay to make full use of existing cables.

[0034] In addition, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0035] Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present invention. It should also be understood by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present invention.

Claims

1. A battery group isolation safety protection device, characterized in that: include: a first branch circuit, a second branch circuit, a third branch circuit and a fourth branch circuit; wherein the first end of the first branch circuit is used to connect to the positive electrode of an external charging and discharging device, and the second end of the first branch circuit is connected to the positive electrode of the first sub-battery group; The first end of the second branch circuit is connected to the positive electrode of the first sub-battery group, the second end of the second branch circuit is connected to the positive input terminal of the core capacity host, and the third end of the second branch circuit is connected to the negative electrode of the first sub-battery group and the positive electrode of the second sub-battery group; The first end of the third branch circuit is connected to the third end of the second branch circuit, the second end of the third branch circuit is connected to the negative input end of the core capacity host, and the third end of the third branch circuit is connected to the negative electrode of the second sub-battery group; The first end of the fourth branch circuit is connected to the third end of the third branch circuit, and the second end of the fourth branch circuit is used to connect to the negative electrode of an external charging and discharging device; The first branch circuit and the fourth branch circuit are used to control the charging and discharging of the first sub-battery group and the second sub-battery group; the second branch circuit and the third branch circuit are used to control the first sub-battery group or the second sub-battery group to perform capacity control.

2. The battery group isolation safety protection device according to claim 1 is characterized in that: The first branch circuit comprises: A first diode and a first switching device; wherein the anode of the first diode is connected to the first end of the second branch circuit and the first end of the first switching device, and the second end of the first switching device is connected to the cathode of the first diode; the cathode of the first diode is used to connect to the anode of an external charging and discharging device.

3. The battery group isolation safety protection device according to claim 2 is characterized in that: The first switching device includes a contactor.

4. The battery group isolation safety protection device according to claim 1, characterized in that: The second branch circuit comprises: A second switch device and a third switch device; wherein the first end of the second switch device is connected to the second end of the first branch circuit, the second end of the second switch device is connected to the first end of the third switch device, and the second end of the third switch device is connected to the first end of the third branch circuit; the second end of the second switch device is connected to the positive input end of the core capacity host.

5. The battery grouping isolation safety protection device according to claim 4 is characterized in that: The second switching device includes a contactor, and the third switching device includes a contactor.

6. The battery group isolation safety protection device according to claim 1, characterized in that: The third branch circuit comprises: A fourth switch device and a fifth switch device; wherein the first end of the fourth switch device is connected to the third end of the second branch circuit, the second end of the fourth switch device is connected to the first end of the fifth switch device, and the second end of the fifth switch device is connected to the first end of the fourth branch circuit; the second end of the fourth switch device is connected to the negative input end of the core capacity host.

7. The battery group isolation safety protection device according to claim 6, characterized in that: The fourth switching device includes a contactor, and the fifth switching device includes a contactor.

8. The battery group isolation safety protection device according to claim 1, characterized in that: The fourth branch circuit comprises: A second diode and a sixth switching device; wherein the anode of the second diode is connected to the first end of the sixth switching device, and the second end of the sixth switching device is connected to the cathode of the second diode and the third end of the third branch circuit; the anode of the second diode is used to connect to the cathode of an external charging and discharging device.

9. The battery group isolation safety protection device according to claim 8, characterized in that: The sixth switching device includes a contactor.

10. The battery group isolation safety protection device according to claim 1, characterized in that: The device also includes: a first resistor, one end of which is connected to the negative electrode of the first sub-battery group and the positive electrode of the second sub-battery group, and the other end of which is connected to the third end of the second branch circuit and the first end of the third branch circuit.

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