Energy storage battery monitoring device and energy storage system

Abstract

The utility model relates to the field of energy storage batteries, and provides an energy storage battery monitoring device and an energy storage system, and the energy storage battery monitoring device comprises a battery cluster which comprises at least two battery packs; the pipe network unit comprises at least two gas pipelines, the gas pipelines are in one-to-one correspondence with the battery packs and are connected with the battery packs, and the gas pipelines are used for leading out the composite gas in the battery packs; the monitoring unit comprises a gas collection chamber and a detection assembly, the gas collection chamber is communicated with each gas pipeline, the gas collection chamber is used for collecting the composite gas discharged by each battery pack, the detection assembly is arranged in the gas collection chamber and used for monitoring performance parameters of the composite gas in the gas collection chamber, and the performance parameters at least comprise the pressure and the concentration of the composite gas. Therefore, the inner cavity of each battery pack is communicated with the gas collection chamber through the pipe network unit, and the performance parameters of gas in the gas collection chamber are monitored through the detection assembly, so that early warning and monitoring of an early cell thermal runaway event are realized, the cost investment is effectively reduced, the data network is simplified, the system reliability is improved, and the product competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, and in particular to an energy storage battery monitoring device and an energy storage system. Background Art

[0002] Based on the thermal runaway safety design requirements of lithium battery energy storage system products, following the safety design principle of "early detection and early disposal" is the consensus of the industry and the best way to reduce the hazards of thermal runaway events of lithium battery energy storage products. The latest national standard requires that the battery room / cabin and fire extinguishing system of lithium battery energy storage products should use the battery module as the minimum protection unit, and each battery module can be individually equipped with a fire extinguishing medium nozzle or fire detection tube. Therefore, the technical route of current market products is gradually shifting towards the technical direction of battery pack-level detection and fire-fighting agent injection and spraying.

[0003] At present, the existing technology usually sets a composite sensor on the outer shell of each battery pack to warn and monitor the thermal runaway event of the battery cell by characterizing the concentration and temperature of the combustible gas released by the thermal runaway of the battery cell. However, this will lead to higher system costs and reduce the market competitiveness of the product. In order to realize the signal monitoring of the composite sensors on each battery pack, it is necessary to add an additional data network, which further increases the system cost and reduces the system reliability. Utility Model Content

[0004] The purpose of the utility model is to provide an energy storage battery monitoring device and an energy storage system to solve the defects and shortcomings in the prior art.

[0005] In order to achieve the above object, the utility model provides an energy storage battery monitoring device, comprising:

[0006] A battery cluster, comprising at least two battery packs;

[0007] a pipe network unit, comprising at least two gas pipelines, wherein the gas pipelines correspond to the battery packs one by one, one end of the gas pipelines is connected to the inner cavity of the battery pack, and the gas pipelines are used to export the composite gas in the battery pack;

[0008] The monitoring unit includes a gas collecting chamber and a detection component, wherein the gas collecting chamber is connected to the other end of each of the gas pipelines, and is used to collect the composite gas discharged from each of the battery packs. The detection component is arranged on the gas collecting chamber, and the detection component is used to monitor the performance parameters of the composite gas in the gas collecting chamber, and the performance parameters at least include the pressure and concentration of the composite gas.

[0009] According to the energy storage battery monitoring device provided by the utility model, the detection component includes:

[0010] A gas pressure sensor is disposed on the gas collecting chamber, and is used to monitor the pressure of the composite gas in the gas collecting chamber;

[0011] A gas concentration sensor is arranged on the gas collecting chamber, and the gas concentration sensor is used to monitor the concentration of the composite gas in the gas collecting chamber.

[0012] According to the energy storage battery monitoring device provided by the utility model, the air pressure sensor and the gas concentration sensor are respectively arranged at two ends of the gas collecting chamber.

[0013] The energy storage battery monitoring device provided by the utility model also includes:

[0014] A pressure relief component is connected to the gas collecting chamber, and is used to prevent the gas pressure in the gas collecting chamber from exceeding a preset pressure.

[0015] According to the energy storage battery monitoring device provided by the utility model, the pressure relief component includes:

[0016] A pressure relief pipeline, one end of which is connected to the gas collecting chamber;

[0017] The elastic airbag is connected to the other end of the pressure relief pipeline so that the composite gas in the gas collecting chamber enters the elastic airbag.

[0018] According to the energy storage battery monitoring device provided by the utility model, the elastic airbag is sealed and connected to the pressure relief pipeline.

[0019] The energy storage battery monitoring device provided by the utility model also includes:

[0020] An operation and maintenance detection interface is connected to the gas collecting chamber, and the operation and maintenance detection interface is in a normally closed state.

[0021] According to the energy storage battery monitoring device provided by the utility model, each of the battery packs is provided with a shell, the shell is provided with a first pipe joint, and one end of the gas pipeline is connected to the first pipe joint.

[0022] According to the energy storage battery monitoring device provided by the utility model, the gas collecting chamber is provided with at least two second pipe joints, and the other end of each of the gas pipelines is respectively arranged corresponding to and connected to each of the second pipe joints.

[0023] The utility model also provides an energy storage system, comprising the energy storage battery monitoring device as described in any one of the above items.

[0024] The energy storage battery monitoring device provided by the utility model includes: a battery cluster, including at least two battery packs; a pipe network unit, including at least two gas pipelines, the gas pipelines correspond to the battery packs one by one, one end of the gas pipeline is connected to the inner cavity of the battery pack, and the gas pipeline is used to export the composite gas in the battery pack; a monitoring unit, including a gas collecting chamber and a detection component, the gas collecting chamber is connected to the other end of each gas pipeline, the gas collecting chamber is used to collect the composite gas discharged from each battery pack, the detection component is arranged on the gas collecting chamber, and the detection component is used to monitor the performance parameters of the composite gas in the gas collecting chamber, and the performance parameters at least include the pressure and concentration of the composite gas. In this way, the inner cavity of each battery pack is connected to the gas collecting chamber through the pipe network unit, and the performance parameters of the composite gas in the gas collecting chamber are monitored through the detection component, so as to realize the early warning and monitoring of the thermal runaway event of the battery cell, effectively reduce the cost investment, simplify the data network, improve the system reliability, and enhance the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the energy storage battery monitoring device provided by the utility model;

[0027] Figure 2 yes Figure 1 Partial schematic diagram at point A in the middle;

[0028] Figure 3 It is a partial schematic diagram of the monitoring unit provided by the utility model;

[0029] Reference numerals:

[0030] 1: battery cluster; 11: battery pack; 111: housing; 112: first pipe joint; 2: pipe network unit; 21: gas pipeline; 3: monitoring unit; 31: gas collecting chamber; 311: second pipe joint; 32: air pressure sensor; 33: gas concentration sensor; 34: pressure relief pipeline; 35: elastic airbag; 36: operation and maintenance detection interface. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Combine the following Figures 1 to 3 The utility model describes an energy storage battery monitoring device.

[0033] like Figures 1 to 3 As shown, the embodiment of the utility model provides an energy storage battery monitoring device, including a battery cluster 1, a pipe network unit 2, and a monitoring unit 3. Specifically, as Figure 1 As shown, the battery cluster 1 includes at least two battery packs 11, each battery pack 11 is formed by a plurality of cells connected in series or in parallel. The pipe network unit 2 includes at least two gas pipelines 21, the gas pipelines 21 correspond to the battery packs 11 one by one, one end of the gas pipeline 21 is connected to the inner cavity of the battery pack 11, and the gas pipeline 21 is used to extract the composite gas in the battery pack 11. The monitoring unit 3 includes a gas collecting chamber 31 and a detection component, the gas collecting chamber 31 is connected to the other end of each gas pipeline 21, and the gas collecting chamber 31 is used to collect the composite gas discharged from each battery pack 11. The detection component is arranged on the gas collecting chamber 31, and the detection component is used to monitor the performance parameters of the composite gas in the gas collecting chamber 31, and the performance parameters at least include the pressure and concentration of the composite gas. Thus, the inner cavities of each battery pack 11 are connected through the pipe network unit 2, and the gas in each battery pack 11 can overflow upward through the gas pipeline 21 and gather in the gas collecting chamber 31. The detection component can monitor the gas state in the gas collecting chamber 31 in real time, so as to find problems in time and solve them as soon as possible. It is understandable that if a thermal runaway accident occurs inside the battery cell, harmful gases such as hydrogen will be released into the inner cavity of the battery pack 11, thereby mixing with the air in the inner cavity of the battery pack 11 to form a composite gas, which then overflows upward through the pipe network unit 2 and enters the monitoring unit 3.

[0034] In this way, the inner cavity of each battery pack 11 is connected to the gas collecting chamber 31 through the pipe network unit 2, and the performance parameters of the composite gas in the gas collecting chamber 31 are monitored by the detection component, so as to realize the early warning and monitoring of thermal runaway events of the battery cell, reduce the number of traditional sensors used, effectively reduce the cost investment, improve the engineering application cost performance of product design, simplify the data transmission network, improve the system reliability, and enhance the market competitiveness of the product. It should be noted that Figure 1 For the placement of the energy storage battery monitoring device shown in the figure, the up and down directions in the figure are the upper and lower directions.

[0035] In the embodiment of the present utility model, the detection component includes an air pressure sensor 32 and a gas concentration sensor 33. Figure 2 As shown, the air pressure sensor 32 and the gas concentration sensor 33 are fixedly installed on the gas collecting chamber 31. The air pressure sensor 32 is used to monitor the pressure of the composite gas in the gas collecting chamber 31, and the gas concentration sensor 33 is used to monitor the concentration of the composite gas in the gas collecting chamber 31. Generally, when a thermal runaway event occurs inside the battery cell of a battery pack 11 due to manufacturing defects, aging or abuse, hydrogen will first be generated and overflow into the inner cavity of the battery pack 11 through the battery cell explosion-proof valve. Based on the low-density physical properties of hydrogen, the hydrogen generated by thermal runaway will diffuse upward through the pipe network unit 2, and finally converge in the gas collecting chamber 31, and be sensed and detected by the gas concentration sensor 33. Since hydrogen is the main hazardous component, generally, the gas concentration sensor 33 can be set as a hydrogen concentration sensor, which is mainly used to detect the concentration of hydrogen to prevent explosion accidents. Compared with installing a composite sensor on each battery pack 11, this setting can greatly reduce the number and types of sensors used, reduce manufacturing costs, and improve the cost performance of the device. In addition, the battery cell temperature can be monitored directly by using the battery cell temperature monitoring function of the BMS (Battery Management System) system without the need to install an additional temperature sensing module.

[0036] Further, in the embodiment of the present utility model, if Figure 3 As shown, the air pressure sensor 32 and the gas concentration sensor 33 are respectively arranged at the two ends of the gas collecting chamber 31. This is convenient for installation, has a reasonable layout, and fully utilizes the installation space.

[0037] In an optional embodiment of the utility model, the energy storage battery monitoring device further includes a pressure relief component, which is connected to the gas collecting chamber 31, and is used to prevent the gas pressure in the gas collecting chamber 31 from exceeding a preset pressure. In this way, when the gas pressure in the gas collecting chamber 31 gradually increases, in order to avoid the risk of explosion, the pressure in the gas collecting chamber 31 can be reduced by the pressure relief component, so that there is no need to install an explosion-proof valve on the shell 111 of each battery pack 11, the number of explosion-proof valves used is reduced, and the disadvantage that water vapor can enter the battery pack 11 due to the use of the explosion-proof valve and increase the generation of condensed water in the battery pack 11 is eliminated.

[0038] In a specific embodiment of the present invention, the pressure relief assembly includes a pressure relief pipeline 34 and an elastic airbag 35. Figure 3 As shown, one end of the pressure relief pipeline 34 is connected to the gas collecting chamber 31, and the other end is connected to the elastic airbag 35, so that the composite gas in the gas collecting chamber 31 can enter the elastic airbag 35. In this way, by installing the elastic airbag 35 on the gas collecting chamber 31, instead of the traditional explosion-proof valve, pressure relief is performed to avoid the explosion accident caused by excessive internal pressure of the battery pack 11, and the structure is simple and the cost is low.

[0039] Furthermore, in the embodiment of the present utility model, the elastic airbag 35 is sealed and connected to the pressure relief pipeline 34. This can improve the sealing performance of the device and reduce the possibility of water vapor and the like entering the pipe network unit 2 and the like.

[0040] As an optional embodiment of the present utility model, the energy storage battery monitoring device also includes an operation and maintenance detection interface 36, such as Figure 3 As shown, the operation and maintenance detection interface 36 is connected to the gas collecting chamber 31, and the operation and maintenance detection interface 36 is in a normally closed state and can be opened when in use. This arrangement improves the convenience of the device by reserving the operation and maintenance detection pipe interface, improves the maintainability and testability of the IP protection level of the battery pack in the battery cluster 1, and reduces the difficulty and cost of operation and maintenance during the product life cycle.

[0041] In the embodiment of the utility model, each battery pack 11 is provided with a housing 111. Figure 2 As shown, the housing 111 is provided with a first pipe joint 112, and one end of the gas pipeline 21 is connected to the first pipe joint 112. Thus, by using the pipe joint, quick disassembly and assembly are facilitated.

[0042] Further, in the embodiment of the present utility model, if Figure 2 As shown, the gas collecting chamber 31 is provided with at least two second pipe joints 311, and the other end of each gas pipeline 21 is respectively provided and connected to each second pipe joint 311. This further improves the assembly efficiency of the pipe network system and the monitoring function module, and makes it more convenient and quick to use.

[0043] In summary, the embodiment of the utility model provides an energy storage battery monitoring device, which specifically includes multiple battery packs 11 and gas pipelines 21, as well as gas collecting chambers 31, air pressure sensors 32, gas concentration sensors 33, elastic airbags 35 and operation and maintenance detection interfaces 36. The inner cavities of each battery pack 11 are connected through a pipe network system and finally gathered in a monitoring function module. And by using the air pressure sensor 32 and gas concentration sensor 33 on the monitoring function module, early warning of thermal runaway events of battery cells and perception of the development of thermal runaway of battery cells can be realized.

[0044] When a thermal runaway event occurs inside a battery pack 11 due to manufacturing defects, aging or abuse, hydrogen will first be generated and overflow into the inner cavity of the battery pack 11 through the battery cell explosion-proof valve. Due to the low-density physical property of hydrogen, the hydrogen generated by thermal runaway will diffuse upward through the gas pipeline 21, and eventually gather in the gas collecting chamber 31 of the monitoring function module, and be sensed and detected by the hydrogen concentration sensor, providing an early thermal runaway safety warning for the equipment system. The battery cluster 1 shares a hydrogen concentration sensor to achieve early warning and monitoring of thermal runaway events of multiple battery packs 11, reducing system costs and ensuring system safety.

[0045] If the thermal runaway of the battery cell further develops and escalates, the explosion-proof valve of the battery cell will open and release a large amount of harmful gas into the inner cavity of the battery pack 11, thereby causing the pressure in the pipe network system and the monitoring function module to increase. At the same time, the air pressure sensor 32 in the monitoring function module can sense the pressure change in time, provide a higher level of thermal runaway safety alarm for the equipment system, and provide a basis for the activation of the fire safety system. The battery cluster 1 shares a single air pressure sensor 32 to monitor and sense thermal runaway events of multiple battery packs 11, replacing the technical solution of installing a composite sensor on each battery pack 11, which greatly reduces costs, greatly simplifies the system structure, and reduces system complexity.

[0046] As the thermal runaway of the battery cell continues to escalate and spread, the pressure in the battery pack 11 continues to increase, which will further cause the deformation of the elastic airbag 35 to increase or even fall off, thereby avoiding an explosion accident caused by excessive pressure in the inner cavity and realizing the function of the battery pack explosion-proof valve. The battery cluster 1 shares a common elastic airbag 35, replacing the explosion-proof valve on the outer shell 111 of each battery pack 11, which reduces costs and improves system reliability. At the same time, the contact between the elastic airbag 35 and the nozzle is a sealed contact, eliminating the hazard of water vapor entering the inner cavity of the battery pack 11 through the explosion-proof valve.

[0047] The monitoring function module is also provided with an operation and maintenance detection interface 36, which can conveniently and flexibly detect the IP protection performance of the battery pack during the equipment operation life cycle, and detect the abnormality of the IP protection performance of the battery pack early. With the combination of standard pipe joints, the abnormal part can be accurately located, thereby achieving the convenience, low cost, low risk and high efficiency of the operation and maintenance of the IP protection performance of the battery pack. In this way, the composite integration function of the monitoring function module is constructed, and the functional gain effect of the system is achieved.

[0048] The energy storage system provided by the present invention is described below. The energy storage system described below and the energy storage battery monitoring device described above can be referenced to each other.

[0049] The embodiment of the utility model also provides an energy storage system, including the energy storage battery monitoring device as described in the above embodiments. In this way, the inner cavity of each battery pack 11 is connected to the gas collecting chamber 31 through the pipe network unit 2, and the performance parameters of the composite gas in the gas collecting chamber 31 are monitored by the detection component, thereby realizing early warning and monitoring of thermal runaway events of the battery cell, effectively reducing cost investment, improving the engineering cost performance of product design, simplifying the data transmission network, improving system reliability, and enhancing the market competitiveness of the product. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the above energy storage battery monitoring device, so it will not be repeated here.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A storage battery monitoring device, characterized in that: include: A battery cluster (1) comprising at least two battery packs (11); A pipe network unit (2) comprising at least two gas pipelines (22), wherein the gas pipelines (22) correspond to the battery packs (11) one by one, one end of the gas pipeline (22) is connected to the inner cavity of the battery pack (11), and the gas pipeline (22) is used to guide the composite gas in the battery pack (11); A monitoring unit (3) comprises a gas collecting chamber (31) and a detection component, wherein the gas collecting chamber (31) is connected to the other end of each of the gas pipelines (22), the gas collecting chamber (31) is used to collect the composite gas discharged from each of the battery packs (11), and the detection component is arranged on the gas collecting chamber (31), and the detection component is used to monitor the performance parameters of the composite gas in the gas collecting chamber (31), wherein the performance parameters at least include the pressure and concentration of the composite gas.

2. The energy storage battery monitoring device according to claim 1, characterized in that: The detection component comprises: A gas pressure sensor (32) is disposed on the gas collecting chamber (31), and the gas pressure sensor (32) is used to monitor the pressure of the composite gas in the gas collecting chamber (31); A gas concentration sensor (33) is arranged on the gas collecting chamber (31), and the gas concentration sensor (33) is used to monitor the concentration of the composite gas in the gas collecting chamber (31).

3. The energy storage battery monitoring device according to claim 2, characterized in that: The air pressure sensor (32) and the gas concentration sensor (33) are respectively arranged at two ends of the gas collecting chamber (31).

4. The energy storage battery monitoring device according to claim 1, characterized in that: Also includes: A pressure relief component is connected to the gas collecting chamber (31), and the pressure relief component is used to prevent the gas pressure in the gas collecting chamber (31) from exceeding a preset pressure.

5. The energy storage battery monitoring device according to claim 4, characterized in that: The pressure relief assembly comprises: A pressure relief pipeline (34), one end of which is connected to the gas collecting chamber (31); The elastic airbag (35) is connected to the other end of the pressure relief pipeline (34) so ​​that the composite gas in the gas collecting chamber (31) enters the elastic airbag (35).

6. The energy storage battery monitoring device according to claim 5, characterized in that: The elastic airbag (35) is sealedly connected to the pressure relief pipeline (34).

7. The energy storage battery monitoring device according to claim 1, characterized in that: Also includes: An operation and maintenance detection interface (36) is in communication with the gas collecting chamber (31), and the operation and maintenance detection interface (36) is in a normally closed state.

8. The energy storage battery monitoring device according to claim 1, characterized in that: Each of the battery packs (11) is provided with a shell (111), the shell (111) is provided with a first pipe joint (112), and one end of the gas pipeline (22) is connected to the first pipe joint (112).

9. The energy storage battery monitoring device according to claim 8, characterized in that: The gas collecting chamber (31) is provided with at least two second pipe joints (311), and the other end of each of the gas pipelines (22) is respectively arranged corresponding to and connected to each of the second pipe joints (311).

10. An energy storage system, characterized in that: It comprises the energy storage battery monitoring device as described in any one of claims 1 to 9.

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