Battery pack fault intelligent control bypass system

Abstract

The utility model provides a battery pack fault intelligent control bypass system. The battery pack fault intelligent control bypass system comprises a plurality of battery packs connected in series; each battery pack comprises a first output end, a second output end and a battery module, the battery module comprises a first module output end, a second module output end and a plurality of battery cell units, and the plurality of battery cell units are arranged between the first module output end and the second module output end; the plurality of battery cell units are mutually connected in series; a five-pin relay is arranged between the first output end and the first module output end; or a five-pin relay is arranged between the second output end and the second module output end. When the battery pack breaks down, the bypass function of the battery pack can be achieved through the five-pin relay control circuit, so that the battery pack with the fault is bypassed, and normal operation of the whole system can be guaranteed. The control circuit is simple and low in use cost, and can be applied to energy storage products in various scenes.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery pack fault intelligent control bypass system. Background Art

[0002] With the rise and development of new energy, the application scenarios of lithium batteries are also increasing. Lithium batteries are a common rechargeable battery and have become the focus of my country's energy structure transformation. With the rapid development of lithium battery technology, lithium batteries are widely used in fields such as mobile devices and electric vehicles. At present, in industrial and commercial energy storage systems and large energy storage systems, a centralized energy storage system structure is generally adopted. In the centralized energy storage system structure, since each cluster battery system is composed of multiple battery packs in series, when one of the battery packs fails, the entire cluster or even the entire energy storage system will stop working, causing huge losses. Utility Model Content

[0003] The present invention provides a battery pack fault intelligent control bypass system, which aims to solve the problem that the existing energy storage system adopts a centralized structure and when one battery pack fails, the entire cluster or even the entire energy storage system will stop working.

[0004] To achieve the above-mentioned purpose, the embodiment of the utility model provides a battery pack fault intelligent control bypass system, comprising a plurality of battery packs connected in series; each of the battery packs comprises a first output terminal, a second output terminal and a battery module, the battery module comprises a first module output terminal, a second module output terminal and a plurality of battery cell units, the plurality of battery cell units are arranged between the first module output terminal and the second module output terminal, and the plurality of battery cell units are connected in series with each other;

[0005] A five-pin relay is provided between the first output terminal and the first module output terminal; or,

[0006] A five-pin relay is provided between the second output terminal and the second module output terminal.

[0007] As a preferred embodiment, the five-pin relay includes a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal and a fifth wiring terminal which are independently arranged;

[0008] When the first wiring terminal and the second wiring terminal are not powered, the third wiring terminal is connected to the fifth wiring terminal;

[0009] When the first wiring terminal and the second wiring terminal are powered on, the third wiring terminal and the fourth wiring terminal are connected.

[0010] As a preferred embodiment, when the five-pin relay is arranged between the first output end and the first module output end, the third terminal is connected to the first output end, the fifth terminal is connected to the first module output end, and the fourth terminal is connected to the second output end and the second module output end respectively.

[0011] As a preferred embodiment, when the five-pin relay is arranged between the second output end and the second module output end, the third terminal is connected to the second output end, the fifth terminal is connected to the second module output end, and the fourth terminal is connected to the first output end and the first module output end respectively.

[0012] As a preferred implementation, the first connecting terminal and the second connecting terminal are coil control terminals of the five-pin relay.

[0013] As a preferred implementation, the third wiring terminal and the fifth wiring terminal are both normally closed circuit terminals of the five-pin relay.

[0014] As a preferred implementation, the third wiring terminal and the fourth wiring terminal are both normally open circuit terminals of the five-pin relay.

[0015] As a preferred implementation, the first output end is a positive output end, and the second output end is a negative output end; the first module output end is a module positive output end, and the second module output end is a module negative output end.

[0016] As a preferred embodiment, the battery pack is a sodium ion battery pack or a lithium ion battery pack.

[0017] The present application sets a five-pin relay at the positive output terminal or the negative output terminal of the battery pack. When the battery pack fails, the bypass function of the battery pack can be realized through the five-pin relay control circuit, so as to bypass the faulty battery pack and ensure the normal operation of the entire system. The control circuit of the present application is simple and has a low cost of use. It can be applied to energy storage products in various scenarios (such as industrial and commercial energy storage, large energy storage direction). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the topological structure of a battery pack fault intelligent control bypass system according to an embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of the topological structure of a battery pack fault intelligent control bypass system according to another embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the topological structure of the battery cluster fault pack bypass using the battery pack fault intelligent control bypass system of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0027] Specifically, Figures 1 to 3 As shown, the embodiment of the utility model provides a battery pack fault intelligent control bypass system, comprising a plurality of battery packs 10 connected in series; each of the battery packs 10 comprises a first output terminal P+, a second output terminal P- and a battery module E, the battery module E comprises a first module output terminal B+, a second module output terminal B- and a plurality of battery cell units En, the plurality of battery cell units En are arranged between the first module output terminal B+ and the second module output terminal B-, and the plurality of battery cell units En are connected in series with each other;

[0028] A five-pin relay 20 is provided between the first output terminal P+ and the first module output terminal B+; or,

[0029] A five-pin relay 20 is provided between the second output terminal P- and the second module output terminal B-.

[0030] As a preferred embodiment, the five-pin relay 20 includes a first terminal 21, a second terminal 22, a third terminal 23, a fourth terminal 24 and a fifth terminal 25 which are independently arranged;

[0031] When the first wiring terminal 21 and the second wiring terminal 22 are not powered, the third wiring terminal 23 and the fifth wiring terminal 25 are connected;

[0032] When the first wiring terminal 21 and the second wiring terminal 22 are powered, the third wiring terminal 23 and the fourth wiring terminal 24 are connected.

[0033] As a preferred embodiment, when the five-pin relay 20 is arranged between the first output terminal P+ and the first module output terminal B+, the third terminal 23 is connected to the first output terminal P+, the fifth terminal 25 is connected to the first module output terminal B+, and the fourth terminal 24 is respectively connected to the second output terminal P- and the second module output terminal B-.

[0034] As a preferred embodiment, when the five-pin relay 20 is arranged between the second output terminal P- and the second module output terminal B-, the third terminal 23 is connected to the second output terminal P-, the fifth terminal 25 is connected to the second module output terminal B-, and the fourth terminal 24 is respectively connected to the first output terminal P+ and the first module output terminal B+.

[0035] As a preferred embodiment, the first connecting terminal 21 and the second connecting terminal 22 are coil control terminals of the five-pin relay 20 .

[0036] As a preferred implementation, the third wiring terminal 23 and the fifth wiring terminal 25 are both normally closed circuit terminals of the five-pin relay 20 .

[0037] As a preferred implementation, the third wiring terminal 23 and the fourth wiring terminal 24 are both normally open circuit terminals of the five-pin relay 20 .

[0038] As a preferred implementation, the first output terminal P+ is a positive output terminal, and the second output terminal P- is a negative output terminal; the first module output terminal B+ is a module positive output terminal, and the second module output terminal B- is a module negative output terminal.

[0039] As a preferred embodiment, the battery pack 10 is a sodium ion battery pack or a lithium ion battery pack.

[0040] like Figure 1 As shown, in the embodiment of the present application, the battery pack 10 is a 16-string battery pack, that is, each battery module En is provided with 16 battery cell units, including E1, E2, E3, E4, E5, E6...E15 and E16, P+ and P- are the output terminals of the battery pack, B+ and B- are the output terminals of the battery module, and the relay is a five-pin relay with a large current capacity.

[0041] 1. When the five-pin relay 20 is arranged between the second output terminal P- and the second module output terminal B-, the negative electrode control working principle of the battery pack 10 is:

[0042] (1) When the battery pack 10 is working normally, the topology diagram is referenced Figure 1 , the working principle is as follows:

[0043] When the battery pack 10 operates normally, there is no power input to the first terminal 21 and the second terminal 22 of the five-pin relay 20, the circuits of the third terminal 23 and the fifth terminal of the five-pin relay 20 are connected, and the current flows in the direction of: P+→the third terminal 23 of the five-pin relay 20→the fifth terminal 25 of the five-pin relay 20→B+→B-→P-.

[0044] (2) When battery pack 10 fails, refer to the topology diagram Figure 1 , the working principle is as follows:

[0045] When a fault occurs in the battery pack 10, the BMS outputs a 12V / 24V power supply to the first terminal 21 and the second terminal 22 of the five-pin relay 20. At this time, the coil of the five-pin relay 20 is energized, and the switch is attracted to the contact of the fourth terminal 24. The third terminal 23 and the fourth terminal 24 of the five-pin relay 20 are connected, and the current flows in the direction of: P+→the third terminal 23 of the five-pin relay 20→the fourth terminal 24 of the five-pin relay 20→P-.

[0046] 2. When the five-pin relay 20 is disposed between the first output terminal P+ and the first module output terminal B+, the positive electrode control working principle of the battery pack 10 is as follows:

[0047] The control principle of the positive electrode of the battery pack is similar to that of the negative electrode. Figure 2 shown.

[0048] 3. Cluster-level battery pack bypass principle

[0049] In a battery cluster system, when a battery pack fails, the battery pack can be bypassed (i.e., the P+ and P- of the battery pack are directly connected without passing through the battery module), and the entire system can operate normally. It only needs to increase the power of other battery packs to meet the power requirements of the entire system. Figure 3 shown.

[0050] The present application sets a five-pin relay at the positive output terminal or the negative output terminal of the battery pack. When the battery pack fails, the bypass function of the battery pack can be realized through the five-pin relay control circuit, so as to bypass the faulty battery pack and ensure the normal operation of the entire system. The control circuit of the present application is simple and has a low cost of use. It can be applied to energy storage products in various scenarios (such as industrial and commercial energy storage, large energy storage direction).

[0051] In the description of this specification, the description with reference to the terms "an embodiment", "example", 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0052] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack fault intelligent control bypass system, characterized in that: Comprising a plurality of battery packs connected in series; each of the battery packs comprises a first output terminal, a second output terminal and a battery module; the battery module comprises a first module output terminal, a second module output terminal and a plurality of battery cell units; the plurality of battery cell units are arranged between the first module output terminal and the second module output terminal, and the plurality of battery cell units are mutually connected in series; A five-pin relay is provided between the first output terminal and the first module output terminal; or, A five-pin relay is provided between the second output terminal and the second module output terminal.

2. The battery pack fault intelligent control bypass system according to claim 1, characterized in that: The five-pin relay comprises a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal and a fifth wiring terminal which are independently arranged; When the first wiring terminal and the second wiring terminal are not powered, the third wiring terminal is connected to the fifth wiring terminal; When the first wiring terminal and the second wiring terminal are powered on, the third wiring terminal and the fourth wiring terminal are connected.

3. The battery pack fault intelligent control bypass system according to claim 2, characterized in that: When the five-pin relay is arranged between the first output end and the first module output end, the third terminal is connected to the first output end, the fifth terminal is connected to the first module output end, and the fourth terminal is connected to the second output end and the second module output end respectively.

4. The battery pack fault intelligent control bypass system according to claim 2, characterized in that: When the five-pin relay is arranged between the second output end and the second module output end, the third terminal is connected to the second output end, the fifth terminal is connected to the second module output end, and the fourth terminal is connected to the first output end and the first module output end respectively.

5. The battery pack fault intelligent control bypass system according to claim 2, characterized in that: The first wiring terminal and the second wiring terminal are coil control terminals of the five-pin relay.

6. The battery pack fault intelligent control bypass system according to claim 2, characterized in that: The third wiring terminal and the fifth wiring terminal are both normally closed circuit terminals of the five-pin relay.

7. The battery pack fault intelligent control bypass system according to claim 2, characterized in that: The third wiring terminal and the fourth wiring terminal are both normally open circuit terminals of the five-pin relay.

8. The battery pack fault intelligent control bypass system according to claim 1, characterized in that: The first output end is a positive output end, and the second output end is a negative output end; the first module output end is a module positive output end, and the second module output end is a module negative output end.

9. The battery pack fault intelligent control bypass system according to claim 1, characterized in that: The battery pack is a sodium ion battery pack or a lithium ion battery pack.

Images